Regulatory Guide 1.212: Difference between revisions

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                                REGULATORY GUIDE 1.212, REVISION 2 Issue Date: June 2023 Technical Lead: Liliana Ramadan SIZING OF LARGE LEAD-ACID STORAGE BATTERIES
                          REGULATORY GUIDE 1.212, REVISION 2
 
Issue Date: June 2023 Technical Lead: Liliana Ramadan
 
SIZING OF LARGE LEAD-ACID STORAGE BATTERIES


==A. INTRODUCTION==
==A. INTRODUCTION==
Purpose This regulatory guide (RG) describes an approach that is acceptable to the staff of the U.S. Nuclear Regulatory Commission (NRC) to meet regulatory requirements for sizing large lead-acid storage batteries for production and utilization facilities. It endorses, with some limitations and a clarification, Institute of Electrical and Electronics Engineers (IEEE) Standard (Std.) 485-2020, IEEE
Purpose
Recommended Practice for Sizing Lead-Acid Batteries for Stationary Applications (Ref. 1).
 
Applicability This RG applies to licensees and applicants subject to Title 10 of the Code of Federal Regulations
This regulatory guide (RG) describes an approach that is accept able to the staff of the U.S. Nuclear Regulatory Commission (NRC) to meet regulatory req  uirements for sizing large lead-acid storage batteries for production and utilization facilities. It   endorses, with some limitations and a clarification, Institute of Electrical and Electronics Engineer s (IEEE) Standard (Std.) 485-2020, IEEE
(10 CFR) Part 50, Domestic Licensing of Production and Utilization Facilities (Ref. 2), and
Recommended Practice for Sizing Lead-Acid Batteries for Station ary Applications (Ref. 1).
10 CFR Part 52, Licenses, Certifications, and Approvals for Nuclear Power Plants (Ref. 3). Under
10 CFR Part 50, this RG applies to licensees of or applicants for production and utilization facilities.


Under 10 CFR Part 52, this RG applies to applicants and holders of combined licenses, standard design certifications, standard design approvals, and manufacturing licenses.
Applicability
 
This RG applies to licensees and applicants subject to Title 10  of the Code of Federal Regulations
(10 CFR) Part 50, Domestic Licensing of Production and Utiliza  tion Facilities (Ref. 2), and
10 CFR Part 52, Licenses, Certifications, and Approvals for Nu  clear Power Plants (Ref. 3). Under
10 CFR Part 50, this RG applies to licensees of or applicants f  or production and utilization facilities.
 
Under 10 CFR Part 52, this RG a pplies to applicants and holders of combined licenses, standard design certifications, standard design approvals, and manufacturing li  censes.


Applicable Regulations
Applicable Regulations


* 10 CFR Part 50 provides regulations for licensing production and utilization facilities.
*                               10 CFR Part 50 provides regulations for licensing production an  d utilization facilities.


o     10 CFR 50.55a, Codes and standards, requires, in part, that structures, systems, and components be designed, fabricated, erected, constructed, tested, and inspected to quality standards commensurate with the importance of the safety function to be performed.
o                                 10 CFR 50.55a, Codes and standards, requires, in part, that s  tructures, systems, and components be designed, fabricated, erected, constructed, teste d, and inspected to quality standards commensurate with the importance of the safety functi on to be performed.


o     10 CFR 50.63(a)(2) requires, in part, that the reactor core and associated coolant, control, and protection systems, including station batteries and any other necessary support systems, provide sufficient capacity and capability to ensure that the core is cooled, and appropriate containment integrity is maintained in the event of a station blackout for the specified duration.
o                                 10 CFR 50.63(a)(2) requires, in part, that the reactor core and associated coolant , control, and protection systems, including st ation batteries and any other n ecessary support systems, provide sufficient capacity and capability to ensure that the core is cooled, and appropriate containment integrity is maintained in the event of a station b  lackout for the specified duration.


Written suggestions regarding this guide may be submitted through the NRCs public Web site in the NRC Library at https://www.nrc.gov/reading-rm/doc-collections/reg-guides/index.html, under Document Collections, in Regulatory Guides, at https://www.nrc.gov/reading-rm/doc-collections/reg-guides/contactus.html, and will be considered in future updates and enhancements to the Regulatory Guide series. During the development process of new guides suggestions should be submitted within the comment period for immediate consideration. Suggestions received outside of the comment period will be considered if practical to do so or may be considered for future updates.
Written suggestions regarding this guide may be submitted throu  gh the NRCs public Web site in the NRC Library at https://www.nrc.gov/reading-rm/doc-collections/reg-guides/index .html, under Document Collections, in Regulatory Guides, at https://www.nrc.gov/reading-rm/doc-collections/reg-guides/contactus.html, and will be considered in future updates and enhancements to the Regulatory Guide series. During the development process of ne  w guides suggestions should be sub mitted within the comment period for immediate consideration. Suggestions received outside of the co mment period will be considered if practical to do so or may be considered for future updates.


Electronic copies of this RG, previous versions of RGs, and other recently issued guides are also available through the NRCs public web site in the NRC Library at https://www.nrc.gov/reading-rm/doc-collections/reg-guides/index.html/ under Document Collections, in Regulatory Guides.
Electronic copies of this RG, previous versions of RGs, and oth  er recently issued guides are also available through the NRCs public web site in the NRC Library at https://www.nrc.gov/reading-rm/doc -collections/reg-guides/index.html/ under Document Collections, in Regulatory Guides.


This RG is also available through the NRCs Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under ADAMS Accession Number (No.) ML23118A344. The regulatory analysis may be found in ADAMS under Accession No. ML22307A144. The associated draft guide DG-1418 may be found in ADAMS under Accession No.
This RG is also available through the NRCs Agencywide Document  s Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under ADAMS Accession Number (No.) ML23118A344. The regulator  y analysis may be found in ADAMS under Accession No. ML22307A144. The associated draft guide DG-1418 may be found in ADAMS under Accession No.


ML22307A132, and the staff responses to the public comments on DG-1418 may be found under ADAMS Accession No. ML23118A345.
ML22307A132, and the staff responses to the public comments on   DG-1418 may be found under ADAMS Accession No. ML23118A345.


o   10 CFR Part 50, Appendix A, General Design Criteria for Nuclear Power Plants, General Design Criterion (GDC) 1, Quality Standards and Records, requires, in part, that structures, systems, and components important to safety be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety functions to be performed.
o                                 10 CFR Part 50, Appendix A, General Design Criteria for Nuclea r Power Plants, General Design Criterion (GDC) 1, Quality Standards and Records, requ ires, in part, that structures, systems, and components important to safety be designed, fabric ated, erected, and tested to quality standards commensurate with the importance of the safety functions to be performed.


o   10 CFR Part 50, Appendix A, GDC 17, Electric Power Systems, requires, in part, that an onsite electric power system and an offsite electric power system be provided to permit functioning of structures, systems, and components important to safety.
o                                 10 CFR Part 50, Appendix A, GDC 17, Electric Power Systems, r equires, in part, that an onsite electric power system and an offsite electric power system be provided to permit functioning of structures, systems, and components important to   safety.


*   10 CFR Part 52 governs the issuance of early site permits, standard design certifications, combined licenses, standard design approvals, and manufacturing licenses for nuclear power facilities. Part 52 specifies, among other things, that contents of some applications must satisfy the requirements of 10 CFR Part 50, Appendix A; 10 CFR 50.55a; and 10 CFR 50.63, Loss of all alternating current power.
*                                                 10 CFR Part 52 governs the issu ance of early site permits, standard design certifications, combined licenses, standard design approvals, and manufacturing   licenses for nuclear power facilities. Part 52 specifies, among other things, that content  s of some applications must satisfy the requirements of 10 CFR Part 50, Appendix A; 10 CFR 50.55a;   and 10 CFR 50.63, Loss of all alternating current power.


Related Guidance
Related Guidance
  *  NUREG-0800, Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: Light-Water Reactor (LWR Edition) (Ref. 4), provides guidance to the NRC staff in performing safety reviews under 10 CFR Part 50 and 10 CFR Part 52. Specifically, Section
      8.3.2, DC Power Systems (Onsite), contains review guidance related to direct current (dc)
      systems, including batteries.


*   RG 1.129, Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Nuclear Power Plants and Utilization Facilities (Ref. 5), endorses, with clarifications, IEEE
*                                                 NUREG-0800, Standard Review Plan for the Review of Safety Anal ysis Reports for Nuclear Power Plants: Light-Water Reactor (LWR Edition) (Ref. 4), prov ides guidance to the NRC staff in performing safety reviews under 10 CFR Part 50 and 10 CFR Pa  rt 52. Specifically, Section
      Std. 450, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications (Ref. 6), as an acceptable method to meet the regulations concerning the maintenance, testing, and replacement of vented lead-acid storage batteries in nuclear power plants.
        8.3.2, DC Power Systems (Onsite), contains review guidance re lated to direct current (dc)
        systems, including batteries.


*   RG 1.128, Installation Design and Installation of Vented Lead-Acid Storage Batteries for Nuclear Power Plants (Ref. 7), endorses, with clarifications, IEEE Std. 484, IEEE
*                                                 RG 1.129, Maintenance, Testing , and Replacement of Vented Lead -Acid Storage Batteries for Nuclear Power Plants and Utilization Facilities (Ref. 5), endo rses, with clarifications, IEEE
      Recommended Practice for Installation Design and Installation of Vented Lead-Acid Batteries for Stationary Applications (Ref. 8), as an acceptable method to meet the regulations concerning the installation design and installation of vented lead-acid storage batteries in nuclear power plants.
        Std. 450, IEEE Recommended Practice for Maintenance, Testing,  and Replacement of Vented Lead-Acid Batteries for Stationary Applications (Ref. 6), as a n acceptable method to meet the regulations concerning the maintenance, testing, and replacemen t of vented lead-acid storage batteries in nuclear power plants.


*   NUREG-1537, Parts 1 and 2, Guidelines for Preparing and Reviewing Applications for the Licensing of Non-Power Reactors, issued February 1996 (Ref. 9), contains format and content guidance for non-power reactor applicants and licensees, as well as a standard review plan and acceptance criteria for the NRC staff.
*                                                 RG 1.128, Installation Design and Installation of Vented Lead- Acid Storage Batteries for Nuclear Power Plants (Ref. 7), endorses, with clarifications,  IEEE Std. 484, IEEE
        Recommended Practice for Installation Design and Installation o f Vented Lead-Acid Batteries for Stationary Applications (Ref. 8), as an acceptable method to meet the regulations concerning the installation design and installation of vented lead-acid storag  e batteries in nuclear power plants.


*   Final Interim Staff Guidance Augmenting NUREG-1537, Guidelines for Preparing and Reviewing Applications for the Licensing of Non-Power Reactors, Parts 1 and 2, for Licensing Radioisotope Production Facilities and Aqueous Homogeneous Reactors, issued October 2012 (Ref. 10), provides format and content guidance for non-power aqueous homogeneous reactor and radioisotope production facility applicants and licensees, as well as a standard review plan and acceptance criteria for the NRC staff.
*                                                 NUREG-1537, Parts 1 and 2, Guidelines for Preparing and Review  ing Applications for the Licensing of Non-Power Reactors, issued February 1996 (Ref. 9) , contains format and content guidance for non-power reactor applicants and licensees, as wel l as a standard review plan and acceptance criteria for the NRC staff.


*   Endorsement of Appendix A to Oak Ridge National Laboratory Report, Proposed Guidance for Preparing and Reviewing a Molten Salt Non-Power Reactor Application, as Guidance for RG 1.212, Rev. 2, Page 2
*                                                 Final Interim Staff Guidance Augmenting NUREG-1537, Guideline  s for Preparing and Reviewing Applications for the Licensing of Non-Power Reactors,  Parts 1 and 2, for Licensing Radioisotope Production Facilities and Aqueous Homogeneous Reac tors, issued October 2012 (Ref. 10), provides format and content guidance for non-power a  queous homogeneous reactor and radioisotope production facility applicants and licensees, as w ell as a standard review plan and acceptance criteria for the NRC staff.


Preparing Applications for the Licensing of Non-Power Liquid Fueled Molten Salt Reactors, dated November 18, 2020 (Ref. 11), endorses, with clarifications, Appendix A to ORNL/TM-2020/1478, Proposed Guidance for Preparing and Reviewing a Molten Salt Non- Power Reactor Application, issued July 2020 (Ref. 12), to support the review of non-power molten salt reactors.
*                                                Endorsement of Appendix A to Oak  Ridge National Laboratory Report, Proposed Guidance for Preparing and Reviewing a Molten Salt Non-Power Reactor Applica tion, as Guidance for


Purpose of Regulatory Guides The NRC issues RGs to describe methods that are acceptable to the staff for implementing specific parts of the agencys regulations, to explain techniques that the staff uses in evaluating specific issues or postulated events, and to describe information that the staff needs in its review of applications for permits and licenses. RGs are not NRC regulations and compliance with them is not required. Methods and solutions that differ from those set forth in RGs are acceptable if supported by a basis for the issuance or continuance of a permit or license by the Commission.
RG 1.212, Rev. 2, Page 2 Preparing Applications for the Licensing of Non-Power Liquid Fu  eled Molten Salt Reactors, dated November 18, 2020 (Ref.  11), endorses, with clarifications, Appendix A to ORNL/TM-2020/1478, Proposed Guidance for Preparing and Reviewi  ng a Molten Salt Non- Power Reactor Application, issued July 2020 (Ref. 12), to supp  ort the review of non-power molten salt reactors.


Paperwork Reduction Act This RG provides voluntary guidance for implementing the mandatory information collections in
Purpose of Regulatory Guides
10 CFR Parts 50 and 52 that are subject to the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.).
These information collections were approved by the Office of Management and Budget (OMB), under control numbers 3150-0011 and 3150-0151, respectively. Send comments regarding this information collection to the FOIA, Library, and Information Collections Branch (T6-A10M), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to Infocollects.Resource@nrc.gov, and to the OMB reviewer at: OMB Office of Information and Regulatory Affairs, (3150-0011 and 3150-
0151), Attn: Desk Officer for the Nuclear Regulatory Commission, 725 17th Street, NW, Washington, DC, 20503; e-mail: oira_submissions@omb.eop.gov.


Public Protection Notification The NRC may not conduct or sponsor, and a person is not required to respond to, a collection of information unless the document requesting or requiring the collection displays a currently valid OMB
The NRC issues RGs to describe methods that are acceptable to the staff for implementing specific parts of the agencys regulati ons, to explain techniques that t he staff uses in evaluating specific issues or postulated events, and to describe information that the staff needs in its review of applications for permits and licenses. RGs are not NRC regulations and compliance with t hem is not required. Methods and solutions that differ from those set forth in RGs are acceptabl e if supported by a basis for the issuance or continuance of a permit or license by the Commission.
 
Paperwork Reduction Act
 
This RG provides voluntary guidance for implementing the mandat  ory information collections in
10 CFR Parts 50 and 52 that are s ubject to the Paperwork Reduct ion Act of 1995 (44 U.S.C. 3501 et seq.).
These information collections were approved by the Office of Ma nagement and Budget (OMB), under control numbers 3150-0011 and 3150-0151, respectively. Send com  ments regarding this information collection to the FOIA, Library, and Information Collections Br  anch (T6-A10M), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail  to Infocollects.Resource@nrc.gov, and to the OMB reviewer at: OMB Office of Information and Regul atory Affairs, (3150-0011 and 3150-
0151), Attn: Desk Officer for the Nuclear Regulatory Commission  , 725 17th Street, NW, Washington, DC, 20503; e-mail: oira_submissions@omb.eop.gov .
 
Public Protection Notification
 
The NRC may not conduct or sponsor , and a person is not require d to respond to, a collection of information unless the document re questing or requiring the col lection displays a currently valid OMB
control number.
control number.


RG 1.212, Rev. 2, Page 3
RG 1.212, Rev. 2, Page 3  


==B. DISCUSSION==
==B. DISCUSSION==
Reason for Revision This revision of the RG (Revision 2) endorses, with some limitations and a clarification, IEEE
Reason for Revision
Std. 485-2020 and applies to production and utilization facilities licensed under 10 CFR Part 50 and
 
10 CFR Part 52 within the scope of this RG. The previous version of this RG endorsed, with certain clarifications, IEEE Std. 485-2010. In 2020, the IEEE revised IEEE Std. 485 to refine the methods for defining dc load guidance and sizing large lead-acid batteries to ensure consistent performance. The revised IEEE standard provides a succinct document for the sizing of batteries with informative annexes.
This revision of the RG (Revision 2) endorses, with some limita tions and a clarification, IEEE
Std. 485-2020 and applies to p roduction and utilization facilities licensed under 10 CFR Part 50 and
10 CFR Part 52 within the scope o f this RG. The previous versio n of this RG endorsed, with certain clarifications, IEEE Std. 485-2010. In 2020, the IEEE revised I EEE Std. 485 to refine the methods for defining dc load guidance and sizing large lead-acid batteries   to ensure consistent performance. The revised IEEE standard provides a succinct document for the sizi ng of batteries with informative annexes.
 
The NRC staff determined that, based on the revised IEEE standard, a revision to this RG is needed to support applications for new reactor licenses, design certifica tions, and license amendments.


The NRC staff determined that, based on the revised IEEE standard, a revision to this RG is needed to support applications for new reactor licenses, design certifications, and license amendments.
Background


Background This RG provides guidance to applicants and licensees for defining the dc load and sizing lead-acid batteries to supply the defined load for full-float stationary battery application
This RG provides guidance to applicants and licensees for defining the dc load and sizing lead-acid batteries to supply the defined load for full-float s  tationary battery application


====s.  IEEE====
====s.  IEEE====
Std. 485-2020 describes the recommended methods for defining the dc load and for sizing lead-acid batteries to supply dc power to applications during the full range of operating and emergency conditions.
Std. 485-2020 describes the recommended methods for defining the dc load and for sizing lead-acid batteries to supply dc power to applications during the full ra  nge of operating and emergency conditions.
 
IEEE Std. 485-2020 is an updated  national consensus standard that adds new recommendations and guidance, as well as informative annexes, for both vented a nd valve-regulated lead-acid batteries for stationary applications. The standard was developed by the IEEE  Power Engineering Society Stationary Batteries Committee and approved  by the IEEE Standards Association Standards Board on May 6, 2020.
 
The standard is applicable to vented and valve-regulated lead-acid batteries and also describes some factors relating to cell selection. However, consideration of b attery types other than lead acid is beyond the scope of this RG. Additionally, installation, maintenance,  qualification, testing procedures, and design of the dc system and sizing of the  battery charger(s) are beyond the scope of the IEEE standard and this RG.
 
It is important to recognize that IEEE Std. 485-2020 states it  can be used as a standalone document. However, the NRC staff has found that using IEEE Std.  485-2020 in conjunction with IEEE
Std. 450 and IEEE Std. 484 provi des the user with a general guide to the design, installation, and maintenance of vented lead-acid batteries. In addition, the staff notes that IEEE/American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE)  1635-2022, Guide for the Ventilation and Thermal Manageme nt of Batteries for Stationary Applications, (Ref. 13) provides helpful ventilation calculations that are associated with IEEE  Standard 484. For the design, installation, and maintenance of valve-regulated lead-acid (VRLA) batteries,  the NRC staff reviewed IEEE Std. 1187, IEEE Recommended Practice for Installation Design and Installa tion of Valve-Regulated Lead-Acid Storage Batteries for Stationary Applications (Ref. 14), and I EEE Std. 1188, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Reg ulated Lead-Acid (VRLA) Batteries for Stationary Applications (Ref. 15), and found that the standard  s provide additional information and criteria for VRLA battery users.
 
The sizing methodology in IEEE Std. 485-2020 is very similar to  that in IEEE Std. 485-2010. The approach consists of defining  the load that the batteries will be required to support and using the guidance in the IEEE standard to determin e the best battery for the appl ication. To this end, IEEE Std. 485-2020
provides guidance on general cons iderations that should be included in defining the duty cycle; load classifications, including continuous, noncontinuous, and momentary loads; and the construction of a duty cycle diagram. In calculating the number of cells and minimum v oltage section, IEEE Std. 485-2020
 
RG 1.212, Rev. 2, Page 4 cautions the user that the charging voltage needs to be recalculated and verified for adequacy if the numbers of cells are rounded off. It also discusses how to ensu  re all voltage drops are considered when calculating the allowable minimum voltage.


IEEE Std. 485-2020 is an updated national consensus standard that adds new recommendations and guidance, as well as informative annexes, for both vented and valve-regulated lead-acid batteries for stationary applications. The standard was developed by the IEEE Power Engineering Society Stationary Batteries Committee and approved by the IEEE Standards Association Standards Board on May 6, 2020.
IEEE Std. 485-2020 discusses defining loads and other considera tions but notes that for sizing purposes the loads can be treated as constant power or constant current. The updated annexes A, B, C, D,
E, F, G, and H are informative, and applicants and licensees sh ould review them to assist with the battery design.


The standard is applicable to vented and valve-regulated lead-acid batteries and also describes some factors relating to cell selection. However, consideration of battery types other than lead acid is beyond the scope of this RG. Additionally, installation, maintenance, qualification, testing procedures, and design of the dc system and sizing of the battery charger(s) are beyond the scope of the IEEE standard and this RG.
IEEE Std. 485-2020, section 4.2.5, Duty Cycle Diagram, states that the total time span of the duty cycle is determined by the requirements of the installatio n. This duty cycle time depends on the type of production and utilization facility design and is typically  discussed in a plant safety analysis report.


It is important to recognize that IEEE Std. 485-2020 states it can be used as a standalone document. However, the NRC staff has found that using IEEE Std. 485-2020 in conjunction with IEEE
This guidance does not apply to the emergency diesel generators  (EDGs) or onsite emergency power sources own battery if provided  separately (which is exclusively sized based on the starting requirement of the EDG or onsite emergency power source, such as field flas  h).
Std. 450 and IEEE Std. 484 provides the user with a general guide to the design, installation, and maintenance of vented lead-acid batteries. In addition, the staff notes that IEEE/American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) 1635-2022, Guide for the Ventilation and Thermal Management of Batteries for Stationary Applications, (Ref. 13) provides helpful ventilation calculations that are associated with IEEE Standard 484. For the design, installation, and maintenance of valve-regulated lead-acid (VRLA) batteries, the NRC staff reviewed IEEE Std. 1187, IEEE Recommended Practice for Installation Design and Installation of Valve-Regulated Lead-Acid Storage Batteries for Stationary Applications (Ref. 14), and IEEE Std. 1188, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications (Ref. 15), and found that the standards provide additional information and criteria for VRLA battery users.


The sizing methodology in IEEE Std. 485-2020 is very similar to that in IEEE Std. 485-2010. The approach consists of defining the load that the batteries will be required to support and using the guidance in the IEEE standard to determine the best battery for the application. To this end, IEEE Std. 485-2020
Consideration of International Standards
provides guidance on general considerations that should be included in defining the duty cycle; load classifications, including continuous, noncontinuous, and momentary loads; and the construction of a duty cycle diagram. In calculating the number of cells and minimum voltage section, IEEE Std. 485-2020
                                            RG 1.212, Rev. 2, Page 4


cautions the user that the charging voltage needs to be recalculated and verified for adequacy if the numbers of cells are rounded off. It also discusses how to ensure all voltage drops are considered when calculating the allowable minimum voltage.
The International Atomic Energy Agency (IAEA) works with member states and other partners to promote the safe, secure, and  peaceful use of nuclear technologies. The IAEA develops safety requirements and safety guides for protecting people and the en  vironment from harmful effects of ionizing radiation. This system of safety fundamentals, safety  requirements, safety guides, and other relevant reports reflects an international perspective on what  constitutes a high level of safety. Pursuant to the Commissions International  Policy Statement (Ref. 16) and Management Directive 6.6, Regulatory Guides (Ref. 17), the NRC considered the following IAEA safety  guide and safety requirement in the development of the RG:


IEEE Std. 485-2020 discusses defining loads and other considerations but notes that for sizing purposes the loads can be treated as constant power or constant current. The updated annexes A, B, C, D,
*                                                IAEA Safety Guide NS-G-1.8, Design of Emergency Power Systems  for Nuclear Power Plants, (Ref. 18)
E, F, G, and H are informative, and applicants and licensees should review them to assist with the battery design.


IEEE Std. 485-2020, section 4.2.5, Duty Cycle Diagram, states that the total time span of the duty cycle is determined by the requirements of the installation. This duty cycle time depends on the type of production and utilization facility design and is typically discussed in a plant safety analysis report.
*                                                IAEA Safety Standards Series No. SSG-34, Design of Electrical  Power Systems for Nuclear Power Plants, (Ref. 19)


This guidance does not apply to the emergency diesel generators (EDGs) or onsite emergency power sources own battery if provided separately (which is exclusively sized based on the starting requirement of the EDG or onsite emergency power source, such as field flash).
Although the NRC has an interest in facilitating the harmonizat  ion of standards used domestically and internationally, the agency does not specifically endorse t he IAEA documents listed above and is only acknowledging that such documents may be a useful reference for general information.
Consideration of International Standards The International Atomic Energy Agency (IAEA) works with member states and other partners to promote the safe, secure, and peaceful use of nuclear technologies. The IAEA develops safety requirements and safety guides for protecting people and the environment from harmful effects of ionizing radiation. This system of safety fundamentals, safety requirements, safety guides, and other relevant reports reflects an international perspective on what constitutes a high level of safety. Pursuant to the Commissions International Policy Statement (Ref. 16) and Management Directive 6.6, Regulatory Guides (Ref. 17), the NRC considered the following IAEA safety guide and safety requirement in the development of the RG:
        *  IAEA Safety Guide NS-G-1.8, Design of Emergency Power Systems for Nuclear Power Plants, (Ref. 18)
        *  IAEA Safety Standards Series No. SSG-34, Design of Electrical Power Systems for Nuclear Power Plants, (Ref. 19)
        Although the NRC has an interest in facilitating the harmonization of standards used domestically and internationally, the agency does not specifically endorse the IAEA documents listed above and is only acknowledging that such documents may be a useful reference for general information.


Documents Discussed in Staff Regulatory Guidance This RG endorses, in part, the use of one or more codes or standards developed by external organizations, and other third-party guidance documents. These codes, standards and third-party guidance documents may contain references to other codes, standards, or third-party guidance documents (secondary references). If a secondary reference has itself been incorporated by reference into NRC
Documents Discussed in Staff Regulatory Guidance
regulations as a requirement, then licensees and applicants must comply with that standard as set forth in the regulation. If the secondary reference has been endorsed in a RG as an acceptable approach for meeting an NRC requirement, then the standard constitutes a method acceptable to the NRC staff for meeting that regulatory requirement as described in the specific RG. If the secondary reference has neither been incorporated by reference into NRC regulations nor endorsed in a RG, then the secondary reference is neither a legally-binding requirement nor a generic NRC-approved acceptable approach for meeting an NRC requirement. However, licensees and applicants may consider and use the information in RG 1.212, Rev. 2, Page 5


the secondary reference, if appropriately justified, consistent with current regulatory practice, and consistent with applicable NRC requirements.
This RG endorses, in part, the use of one or more codes or sta ndards developed by external organizations, and other third-party guidance documents. These codes, standards and third-party guidance documents may contain references to other codes, standards, or third-party guidance documents (secondary references). If a secondary reference has itself been incorporated by reference into NRC
regulations as a requirement, then licensees and applicants mus t comply with that standard as set forth in the regulation. If the secondary  reference has been endorsed in a RG as an acceptable approach for meeting an NRC requirement, then the standard constitutes a met  hod acceptable to the NRC staff for meeting that regulatory requirement as described in the specific RG. If the secondary reference has neither been incorporated by refe rence into NRC regulations nor endorsed in a RG, then the secondary reference is neither a legally-binding requirement nor a gener ic NRC-approved acceptable approach for meeting an NRC requirement. However, licensees and applicants m ay consider and use the information in


RG 1.212, Rev. 2, Page 6
RG 1.212, Rev. 2, Page 5 the secondary reference, if appropriately justified, consistent  with current regulatory practice, and consistent with applicable NRC requirements.


C. STAFF REGULATORY GUIDANCE
RG 1.212, Rev. 2, Page 6 C. STAFF REGULATORY GUIDANCE
        The staff finds that IEEE Std. 485-2020 provides methods acceptable to the NRC staff for complying with the design requirements for stationary battery applications in full-float operation for production and utilization facilities, subject to the following limitations and a clarification:
 
1.     Annex A to IEEE Std. 485-2020 is informative and provides sample sizing demonstrations.
The staff finds that IEEE Std. 485-2020 provides methods accept  able to the NRC staff for complying with the design requirements for stationary battery a  pplications in full-float operation for production and utilization faciliti es, subject to the following limitations and a clarification:
 
1.                                                                                                   Annex A to IEEE Std. 485-2020 is i nformative and provides sampl e sizing demonstrations.


Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020
Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020
        does not include endorsement of this annex.
          does not include endorsement of this annex.


2.     Annex B to IEEE Std. 485-2020 is informative and provides a method for estimating battery terminal voltage at various points in the battery duty cycle using the manufacturers typical discharge characteristics. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.
2.                                                                                                   Annex B to IEEE Std. 485-2020 is i nformative and provides a method for estimating battery terminal voltage at various point s in the battery duty cycle using the manufacturers typical discharge characteristics. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not inc lude endorsement of this anne x.


3.     Annex C to IEEE Std. 485-2020 is informative and provides a method for considering other cell types when selecting a battery for its intended application. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.
3.                                                                                                   Annex C to IEEE Std. 485-2020 is i nformative and provides a method for considering other cell types when selecting a battery for its intended application. Un  less otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.


4.     Annex D to IEEE Std. 485-2020 is informative and provides a method for sizing a battery properly for a constant power application and for converting from either constant power loads or constant resistance loads to constant current. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.
4.                                                                                                   Annex D to IEEE Std. 485-2020 is i nformative and provides a method for sizing a battery properly for a constant power application and for converting fr  om either constant power loads or constant resistance loads to constant current. Unless otherwise stated in a separate regulatory position, endorsement of IEEE St d. 485-2020 does not include en dorsement of this annex.


5.     Annex E to IEEE Std. 485-2020 is informative and provides a method for describing the construction and use of the battery discharge characteristics curve. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.
5.                                                                                                   Annex E to IEEE Std. 485-2020 is i nformative and provides a method for describing the construction and use of the batte ry discharge characteristics curve. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.


6.     Annex F to IEEE Std. 485-2020 is informative and provides a method for addressing random loads and their application in the battery sizing process. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.
6.                                                                                                   Annex F to IEEE Std. 485-2020 is i nformative and provides a method for addressing random loads and their application in the battery sizing process. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.


7.     Annex G to IEEE Std. 485-2020 is a full-size worksheet, Sizing Lead-Acid Batteries for Stationary Applications, and is endorsed as an accepted method for sizing lead-acid batteries.
7.                                                                                                   Annex G to IEEE Std. 485-2020 is a full-size worksheet, Sizing Lead-Acid Batteries for Stationary Applications, and is endorsed as an accepted method for sizing lead-acid batteries.


8.     Annex H to IEEE Std. 485-2020 is informative and provides the bibliography. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.
8.                                                                                                   Annex H to IEEE Std. 485-2020 is i nformative and provides the b ibliography. Unless otherwise stated in a separate regulatory position, endorsement of IEEE S  td. 485-2020 does not include endorsement of this annex.


9.     The safety analysis report should discuss the battery duty cycle span. For active designs, the battery duty cycle should cover both DBA and SBO scenarios (with a permitted load shedding scheme). The minimum duty cycle for active designs for DBAs should be 2 hours.
9.                                                                                                   The safety analysis report should discuss the battery duty cycl e span. For active designs, the battery duty cycle should cover both DBA and SBO scenarios (wit  h a permitted load shedding scheme). The minimum duty cycle for active designs for DBAs sho uld be 2 hours.


RG 1.212, Rev. 2, Page 7
RG 1.212, Rev. 2, Page 7  


==D. IMPLEMENTATION==
==D. IMPLEMENTATION==
The NRC staff may use this regulatory guide as a reference in its regulatory processes, such as licensing, inspection, or enforcement. However, the NRC staff does not intend to use the guidance in this RG to support NRC staff actions in a manner that would constitute backfitting as that term is defined in
The NRC staff may use this regulatory guide as a reference in its regulatory processes, such as licensing, inspection, or enforcement. However, the NRC staff d oes not intend to use the guidance in this RG to support NRC staff actions in a manner that would constitu te backfitting as that term is defined in
10 CFR 50.109, Backfitting, and as described in NRC Management Directive 8.4, Management of Backfitting, Forward Fitting, Issue Finality, and  
10 CFR 50.109, Backfitting, and as described in NRC Management Directive 8.4, Management of Backfitting, Forward Fitting, Issue Finality, and Information R  equests, (Ref. 20), nor does the NRC staff intend to use the guidance to affect the issue finality of an approval under 10 CFR Part 52, Licenses, Certifications, and Approvals for  Nuclear Power Plants. The staff also does not intend to use the guidance to support NRC staff ac tions in a manner that constitu tes forward fitting as that term is defined and described in Management Directive 8.4. If a licensee believ es that the NRC is using this regulatory guide in a manner inconsistent with the discussion in this Impl  ementation section, then the licensee may file a backfitting or forward fitting appeal with the NRC in ac cordance with the process in Management Directive 8.4.


===
RG 1.212, Rev. 2, Page 8 REFERENCES 1
 
1.                                                                                                  Institute of Electrical and Electronics Engineers (IEEE) Standa rd (Std.) 485-2020, IEEE
          Recommended Practice for Sizing Lead-Acid Batteries for Station ary Applications, Piscataway, New Jersey.2
 
2.                                                                                                  U.S. Code of Federal Regulations  (CFR), Domestic Licensing of Production and Utilization Facilities, Part 50, Chapter I, Title 10, Energy.
 
3.                                                                                                  CFR, Licenses, Certifications, and Approvals for Nuclear Power Plants, Part 52, Chapter I,
          Title 10, Energy.


===Information Requests===
4.                                                                                                  U.S. NRC, NUREG-0800, Standard R eview Plan for the Review of S afety Analysis Reports for Nuclear Power Plants: LWR Edition, Section 8.3.2, DC Power Sy  stems (Onsite),
===
          Washington, DC. (ADAMS Accession No. ML100740391)
, (Ref. 20), nor does the NRC staff intend to use the guidance to affect the issue finality of an approval under 10 CFR Part 52, Licenses, Certifications, and Approvals for Nuclear Power Plants. The staff also does not intend to use the guidance to support NRC staff actions in a manner that constitutes forward fitting as that term is defined and described in Management Directive 8.4. If a licensee believes that the NRC is using this regulatory guide in a manner inconsistent with the discussion in this Implementation section, then the licensee may file a backfitting or forward fitting appeal with the NRC in accordance with the process in Management Directive 8.4.


RG 1.212, Rev. 2, Page 8
5.                                                                                                  NRC, RG 1.129, Maintenance, Testing, and Replacement of Vented  Lead-Acid Storage Batteries for Production and Utilization Facilities, Washingto n, DC.


REFERENCES 1
6.                                                                                                   IEEE Std. 450, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications, Piscataway, New Jersey.
1.       Institute of Electrical and Electronics Engineers (IEEE) Standard (Std.) 485-2020, IEEE
        Recommended Practice for Sizing Lead-Acid Batteries for Stationary Applications, Piscataway, New Jersey.2
2.      U.S. Code of Federal Regulations (CFR), Domestic Licensing of Production and Utilization Facilities, Part 50, Chapter I, Title 10, Energy.


3.       CFR, Licenses, Certifications, and Approvals for Nuclear Power Plants, Part 52, Chapter I,
7.                                                                                                   NRC, RG 1.128, Installation Design and Installation of Vented  Lead-Acid Storage Batteries for Nuclear Power Plants, Washington, DC.
        Title 10, Energy.


4.       U.S. NRC, NUREG-0800, Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition, Section 8.3.2, DC Power Systems (Onsite),
8.                                                                                                   IEEE Std. 484, IEEE Recommended Practice for Installation Desi gn and Installation of Vented Lead-Acid Batteries for Stationary Applications, Piscataway, New Jersey.
        Washington, DC. (ADAMS Accession No. ML100740391)
5.      NRC, RG 1.129, Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Production and Utilization Facilities, Washington, DC.


6.       IEEE Std. 450, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications, Piscataway, New Jersey.
9.                                                                                                   NRC, NUREG-1537, Parts 1 and 2, Guidelines for Preparing and R eviewing Applications for the Licensing of Non-Power Reactors, Washington, DC, February  1996. (ML12156A069 and ML12156A075, respectively)


7.       NRC, RG 1.128, Installation Design and Installation of Vented Lead-Acid Storage Batteries for Nuclear Power Plants, Washington, DC.
10.                                                                             NRC, Final Interim Staff Guid ance Augmenting NUREG-1537, Guid elines for Preparing and Reviewing Applications for the Licensing of Non-Power Reactors,  Parts 1 and 2, for Licensing Radioisotope Production Facilities and Aqueous Homogeneous Reac tors, Washington, DC,
          October 17, 2012. (ML12156A053)


8.       IEEE Std. 484, IEEE Recommended Practice for Installation Design and Installation of Vented Lead-Acid Batteries for Stationary Applications, Piscataway, New Jersey.
11.                                                                             NRC, Endorsement of Appendix A  to Oak Ridge National Laboratory Report, Proposed Guidance for Preparing and Reviewing a Molten Salt Non-Power Reactor Application, as


9.      NRC, NUREG-1537, Parts 1 and 2, Guidelines for Preparing and Reviewing Applications for the Licensing of Non-Power Reactors, Washington, DC, February 1996. (ML12156A069 and ML12156A075, respectively)
1                                     Publicly available NRC published documents are available electronically through the NRC Library on the NRCs public website at http://www.nrc.gov/reading-rm/doc-collections/ and through the NRCs Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html. For problems with ADAMS, contact the Public Document Room staff at 301-415-4737 or (800) 397-4209, or email pdr.resource@nrc.gov. The NRC Public Document Room (PDR), where you may also examine and order copies of publicly available documents, is open by appointment. To make an appointment to visit the PDR, please send an email to PDR.Resource@nrc.gov or call 1-800-397-
10.      NRC, Final Interim Staff Guidance Augmenting NUREG-1537, Guidelines for Preparing and Reviewing Applications for the Licensing of Non-Power Reactors, Parts 1 and 2, for Licensing Radioisotope Production Facilities and Aqueous Homogeneous Reactors, Washington, DC,
    4209 or 301-415-4737, between 8 a.m. and 4 p.m. eastern time (ET), Monday through Friday, except Federal holidays.
        October 17, 2012. (ML12156A053)
11.      NRC, Endorsement of Appendix A to Oak Ridge National Laboratory Report, Proposed Guidance for Preparing and Reviewing a Molten Salt Non-Power Reactor Application, as
1  Publicly available NRC published documents are available electronically through the NRC Library on the NRCs public website at http://www.nrc.gov/reading-rm/doc-collections/ and through the NRCs Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html. For problems with ADAMS, contact the Public Document Room staff at 301-415-4737 or (800) 397-4209, or email pdr.resource@nrc.gov. The NRC Public Document Room (PDR), where you may also examine and order copies of publicly available documents, is open by appointment. To make an appointment to visit the PDR, please send an email to PDR.Resource@nrc.gov or call 1-800-397-
    4209 or 301-415-4737, between 8 a.m. and 4 p.m. eastern time (ET), Monday through Friday, except Federal holidays.


2   Copies of Institute of Electrical and Electronics Engineers (IEEE) documents may be purchased from the Institute of Electrical and Electronics Engineers Service Center, 445 Hoes Lane, PO Box 1331, Piscataway, NJ 08855 or through the IEEEs public Web site at http://www.ieee.org/publications/index.html.
2                                     Copies of Institute of Electrical and Electronics Engineers   (IEEE) documents may be purchased from the Institute of Electrical and Electronics Engineers Service Center, 445 Hoes L  ane, PO Box 1331, Piscataway, NJ 08855 or through the IEEEs public Web site at http://www.ieee.org/publications/index.html.


RG 1.212, Rev. 2, Page 9
RG 1.212, Rev. 2, Page 9 Guidance for Preparing Applications for the Licensing of Non-Po  wer Liquid Fueled Molten Salt Reactors, Washington, DC, November 18, 2020. (ML20251A008)


Guidance for Preparing Applications for the Licensing of Non-Power Liquid Fueled Molten Salt Reactors, Washington, DC, November 18, 2020. (ML20251A008)
12.                                                                             Oak Ridge National Laboratory, ORNL/TM-2020/1478, Proposed Gui dance for Preparing and Reviewing a Molten Salt Non-Power Reactor Application, Oak Ridge, Tennessee, July 2020.
12.     Oak Ridge National Laboratory, ORNL/TM-2020/1478, Proposed Guidance for Preparing and Reviewing a Molten Salt Non-Power Reactor Application, Oak Ridge, Tennessee, July 2020.


(ML20219A771)
(ML20219A771)
13.    IEEE/American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE),
        IEEE/ASHRAE 1635-2022, Guide for the Ventilation and Thermal Management of Batteries for Stationary Applications, Piscataway, New Jersey.


14.     IEEE Std. 1187, IEEE Recommended Practice for Installation Design and Installation of Valve-Regulated Lead-Acid Storage Batteries for Stationary Applications, Piscataway, New Jersey.
13.                                                                            IEEE/American Society of Heating, Refrigerating and Air Conditi oning Engineers (ASHRAE),
          IEEE/ASHRAE 1635-2022, Guide for  the Ventilation and Thermal M anagement of Batteries for Stationary Applications, Piscataway, New Jersey.
 
14.                                                                             IEEE Std. 1187, IEEE Recommended Practice for Installation Des ign and Installation of Valve-Regulated Lead-Acid Storage Batteries for Stationary Appl ications, Piscataway, New Jersey.
 
15.                                                                            IEEE Std. 1188, IEEE Recommended Practice for Maintenance, Tes ting, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications, Piscataway, New Jersey.


15.     IEEE Std. 1188, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications, Piscataway, New Jersey.
16.                                                                             NRC, Nuclear Regulatory Commiss ion International Policy Statement, Federal Register, Vol. 79, No. 132, July 10, 2014, pp. 39415-39418.


16.     NRC, Nuclear Regulatory Commission International Policy Statement, Federal Register, Vol. 79, No. 132, July 10, 2014, pp. 39415-39418.
17.                                                                             NRC, Management Directive 6.6, Regulatory Guides, Washington, DC.


17.     NRC, Management Directive 6.6, Regulatory Guides, Washington, DC.
18.                                                                             International Atomic Energy Agency (IAEA) Safety Guide NS-G-1.8, Design of Emergency Power Systems for Nuclear Power Plants, IAEA, Vienna, Austria, 2004.3


18.    International Atomic Energy Agency (IAEA) Safety Guide NS-G-1.8, Design of Emergency Power Systems for Nuclear Power Plants, IAEA, Vienna, Austria, 2004.3
19.                                                                             IAEA, Safety Standards Series No. SSG-34, Design of Electrical Power Systems for Nuclear Power Plants, IAEA, Vienna, Austria, 2016.
19.     IAEA, Safety Standards Series No. SSG-34, Design of Electrical Power Systems for Nuclear Power Plants, IAEA, Vienna, Austria, 2016.


20.     NRC, Management Directive 8.4, Management of Backfitting, Forward Fitting, Issue Finality, and  
20.                                                                             NRC, Management Directive 8.4, Management of Backfitting, Forw ard Fitting, Issue Finality, and  


===
===
Line 217: Line 243:
, Washington, DC.
, Washington, DC.


3   Copies of International Atomic Energy Agency (IAEA) documents may be obtained through their Web site:
3                                     Copies of International Atomic Energy Agency (IAEA) documents may be obtained through their Web site:
    www.IAEA.org/ or by writing the International Atomic Energy Agency, P.O. Box 100 Wagramer Strasse 5, A-1400 Vienna, Austria.
    www.IAEA.org/ or by writing the International Atomic Energy Agency, P.O. Box   100 Wagramer Strasse 5, A-1400 Vienna, Austria.


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Revision as of 18:14, 14 November 2024

Rev 2, Sizing of Large Lead-Acid Storage Batteries
ML23118A344
Person / Time
Issue date: 06/30/2023
From: Liliana Ramadan
NRC/NRR/DEX/ELTB
To:
Shared Package
ML23118A358 List:
References
DG-1418 RG-1.212, Rev. 2
Download: ML23118A344 (10)
v • d • e


U.S. NUCLEAR REGULATORY COMMISSION

REGULATORY GUIDE 1.212, REVISION 2

Issue Date: June 2023 Technical Lead: Liliana Ramadan

SIZING OF LARGE LEAD-ACID STORAGE BATTERIES

A. INTRODUCTION

Purpose

This regulatory guide (RG) describes an approach that is accept able to the staff of the U.S. Nuclear Regulatory Commission (NRC) to meet regulatory req uirements for sizing large lead-acid storage batteries for production and utilization facilities. It endorses, with some limitations and a clarification, Institute of Electrical and Electronics Engineer s (IEEE) Standard (Std.) 485-2020, IEEE

Recommended Practice for Sizing Lead-Acid Batteries for Station ary Applications (Ref. 1).

Applicability

This RG applies to licensees and applicants subject to Title 10 of the Code of Federal Regulations

(10 CFR) Part 50, Domestic Licensing of Production and Utiliza tion Facilities (Ref. 2), and

10 CFR Part 52, Licenses, Certifications, and Approvals for Nu clear Power Plants (Ref. 3). Under

10 CFR Part 50, this RG applies to licensees of or applicants f or production and utilization facilities.

Under 10 CFR Part 52, this RG a pplies to applicants and holders of combined licenses, standard design certifications, standard design approvals, and manufacturing li censes.

Applicable Regulations

  • 10 CFR Part 50 provides regulations for licensing production an d utilization facilities.

o 10 CFR 50.55a, Codes and standards, requires, in part, that s tructures, systems, and components be designed, fabricated, erected, constructed, teste d, and inspected to quality standards commensurate with the importance of the safety functi on to be performed.

o 10 CFR 50.63(a)(2) requires, in part, that the reactor core and associated coolant , control, and protection systems, including st ation batteries and any other n ecessary support systems, provide sufficient capacity and capability to ensure that the core is cooled, and appropriate containment integrity is maintained in the event of a station b lackout for the specified duration.

Written suggestions regarding this guide may be submitted throu gh the NRCs public Web site in the NRC Library at https://www.nrc.gov/reading-rm/doc-collections/reg-guides/index .html, under Document Collections, in Regulatory Guides, at https://www.nrc.gov/reading-rm/doc-collections/reg-guides/contactus.html, and will be considered in future updates and enhancements to the Regulatory Guide series. During the development process of ne w guides suggestions should be sub mitted within the comment period for immediate consideration. Suggestions received outside of the co mment period will be considered if practical to do so or may be considered for future updates.

Electronic copies of this RG, previous versions of RGs, and oth er recently issued guides are also available through the NRCs public web site in the NRC Library at https://www.nrc.gov/reading-rm/doc -collections/reg-guides/index.html/ under Document Collections, in Regulatory Guides.

This RG is also available through the NRCs Agencywide Document s Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under ADAMS Accession Number (No.) ML23118A344. The regulator y analysis may be found in ADAMS under Accession No. ML22307A144. The associated draft guide DG-1418 may be found in ADAMS under Accession No.

ML22307A132, and the staff responses to the public comments on DG-1418 may be found under ADAMS Accession No. ML23118A345.

o 10 CFR Part 50, Appendix A, General Design Criteria for Nuclea r Power Plants, General Design Criterion (GDC) 1, Quality Standards and Records, requ ires, in part, that structures, systems, and components important to safety be designed, fabric ated, erected, and tested to quality standards commensurate with the importance of the safety functions to be performed.

o 10 CFR Part 50, Appendix A, GDC 17, Electric Power Systems, r equires, in part, that an onsite electric power system and an offsite electric power system be provided to permit functioning of structures, systems, and components important to safety.

  • 10 CFR Part 52 governs the issu ance of early site permits, standard design certifications, combined licenses, standard design approvals, and manufacturing licenses for nuclear power facilities. Part 52 specifies, among other things, that content s of some applications must satisfy the requirements of 10 CFR Part 50, Appendix A; 10 CFR 50.55a; and 10 CFR 50.63, Loss of all alternating current power.

Related Guidance

  • NUREG-0800, Standard Review Plan for the Review of Safety Anal ysis Reports for Nuclear Power Plants: Light-Water Reactor (LWR Edition) (Ref. 4), prov ides guidance to the NRC staff in performing safety reviews under 10 CFR Part 50 and 10 CFR Pa rt 52. Specifically, Section

8.3.2, DC Power Systems (Onsite), contains review guidance re lated to direct current (dc)

systems, including batteries.

  • RG 1.129, Maintenance, Testing , and Replacement of Vented Lead -Acid Storage Batteries for Nuclear Power Plants and Utilization Facilities (Ref. 5), endo rses, with clarifications, IEEE Std. 450, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications (Ref. 6), as a n acceptable method to meet the regulations concerning the maintenance, testing, and replacemen t of vented lead-acid storage batteries in nuclear power plants.
  • RG 1.128, Installation Design and Installation of Vented Lead- Acid Storage Batteries for Nuclear Power Plants (Ref. 7), endorses, with clarifications, IEEE Std. 484, IEEE

Recommended Practice for Installation Design and Installation o f Vented Lead-Acid Batteries for Stationary Applications (Ref. 8), as an acceptable method to meet the regulations concerning the installation design and installation of vented lead-acid storag e batteries in nuclear power plants.

  • NUREG-1537, Parts 1 and 2, Guidelines for Preparing and Review ing Applications for the Licensing of Non-Power Reactors, issued February 1996 (Ref. 9) , contains format and content guidance for non-power reactor applicants and licensees, as wel l as a standard review plan and acceptance criteria for the NRC staff.
  • Final Interim Staff Guidance Augmenting NUREG-1537, Guideline s for Preparing and Reviewing Applications for the Licensing of Non-Power Reactors, Parts 1 and 2, for Licensing Radioisotope Production Facilities and Aqueous Homogeneous Reac tors, issued October 2012 (Ref. 10), provides format and content guidance for non-power a queous homogeneous reactor and radioisotope production facility applicants and licensees, as w ell as a standard review plan and acceptance criteria for the NRC staff.
  • Endorsement of Appendix A to Oak Ridge National Laboratory Report, Proposed Guidance for Preparing and Reviewing a Molten Salt Non-Power Reactor Applica tion, as Guidance for

RG 1.212, Rev. 2, Page 2 Preparing Applications for the Licensing of Non-Power Liquid Fu eled Molten Salt Reactors, dated November 18, 2020 (Ref. 11), endorses, with clarifications, Appendix A to ORNL/TM-2020/1478, Proposed Guidance for Preparing and Reviewi ng a Molten Salt Non- Power Reactor Application, issued July 2020 (Ref. 12), to supp ort the review of non-power molten salt reactors.

Purpose of Regulatory Guides

The NRC issues RGs to describe methods that are acceptable to the staff for implementing specific parts of the agencys regulati ons, to explain techniques that t he staff uses in evaluating specific issues or postulated events, and to describe information that the staff needs in its review of applications for permits and licenses. RGs are not NRC regulations and compliance with t hem is not required. Methods and solutions that differ from those set forth in RGs are acceptabl e if supported by a basis for the issuance or continuance of a permit or license by the Commission.

Paperwork Reduction Act

This RG provides voluntary guidance for implementing the mandat ory information collections in

10 CFR Parts 50 and 52 that are s ubject to the Paperwork Reduct ion Act of 1995 (44 U.S.C. 3501 et seq.).

These information collections were approved by the Office of Ma nagement and Budget (OMB), under control numbers 3150-0011 and 3150-0151, respectively. Send com ments regarding this information collection to the FOIA, Library, and Information Collections Br anch (T6-A10M), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to Infocollects.Resource@nrc.gov, and to the OMB reviewer at: OMB Office of Information and Regul atory Affairs, (3150-0011 and 3150-

0151), Attn: Desk Officer for the Nuclear Regulatory Commission , 725 17th Street, NW, Washington, DC, 20503; e-mail: oira_submissions@omb.eop.gov .

Public Protection Notification

The NRC may not conduct or sponsor , and a person is not require d to respond to, a collection of information unless the document re questing or requiring the col lection displays a currently valid OMB

control number.

RG 1.212, Rev. 2, Page 3

B. DISCUSSION

Reason for Revision

This revision of the RG (Revision 2) endorses, with some limita tions and a clarification, IEEE Std. 485-2020 and applies to p roduction and utilization facilities licensed under 10 CFR Part 50 and

10 CFR Part 52 within the scope o f this RG. The previous versio n of this RG endorsed, with certain clarifications, IEEE Std. 485-2010. In 2020, the IEEE revised I EEE Std. 485 to refine the methods for defining dc load guidance and sizing large lead-acid batteries to ensure consistent performance. The revised IEEE standard provides a succinct document for the sizi ng of batteries with informative annexes.

The NRC staff determined that, based on the revised IEEE standard, a revision to this RG is needed to support applications for new reactor licenses, design certifica tions, and license amendments.

Background

This RG provides guidance to applicants and licensees for defining the dc load and sizing lead-acid batteries to supply the defined load for full-float s tationary battery application

s. IEEE

Std. 485-2020 describes the recommended methods for defining the dc load and for sizing lead-acid batteries to supply dc power to applications during the full ra nge of operating and emergency conditions.

IEEE Std. 485-2020 is an updated national consensus standard that adds new recommendations and guidance, as well as informative annexes, for both vented a nd valve-regulated lead-acid batteries for stationary applications. The standard was developed by the IEEE Power Engineering Society Stationary Batteries Committee and approved by the IEEE Standards Association Standards Board on May 6, 2020.

The standard is applicable to vented and valve-regulated lead-acid batteries and also describes some factors relating to cell selection. However, consideration of b attery types other than lead acid is beyond the scope of this RG. Additionally, installation, maintenance, qualification, testing procedures, and design of the dc system and sizing of the battery charger(s) are beyond the scope of the IEEE standard and this RG.

It is important to recognize that IEEE Std. 485-2020 states it can be used as a standalone document. However, the NRC staff has found that using IEEE Std. 485-2020 in conjunction with IEEE Std. 450 and IEEE Std. 484 provi des the user with a general guide to the design, installation, and maintenance of vented lead-acid batteries. In addition, the staff notes that IEEE/American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) 1635-2022, Guide for the Ventilation and Thermal Manageme nt of Batteries for Stationary Applications, (Ref. 13) provides helpful ventilation calculations that are associated with IEEE Standard 484. For the design, installation, and maintenance of valve-regulated lead-acid (VRLA) batteries, the NRC staff reviewed IEEE Std. 1187, IEEE Recommended Practice for Installation Design and Installa tion of Valve-Regulated Lead-Acid Storage Batteries for Stationary Applications (Ref. 14), and I EEE Std. 1188, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Reg ulated Lead-Acid (VRLA) Batteries for Stationary Applications (Ref. 15), and found that the standard s provide additional information and criteria for VRLA battery users.

The sizing methodology in IEEE Std. 485-2020 is very similar to that in IEEE Std. 485-2010. The approach consists of defining the load that the batteries will be required to support and using the guidance in the IEEE standard to determin e the best battery for the appl ication. To this end, IEEE Std. 485-2020

provides guidance on general cons iderations that should be included in defining the duty cycle; load classifications, including continuous, noncontinuous, and momentary loads; and the construction of a duty cycle diagram. In calculating the number of cells and minimum v oltage section, IEEE Std. 485-2020

RG 1.212, Rev. 2, Page 4 cautions the user that the charging voltage needs to be recalculated and verified for adequacy if the numbers of cells are rounded off. It also discusses how to ensu re all voltage drops are considered when calculating the allowable minimum voltage.

IEEE Std. 485-2020 discusses defining loads and other considera tions but notes that for sizing purposes the loads can be treated as constant power or constant current. The updated annexes A, B, C, D,

E, F, G, and H are informative, and applicants and licensees sh ould review them to assist with the battery design.

IEEE Std. 485-2020, section 4.2.5, Duty Cycle Diagram, states that the total time span of the duty cycle is determined by the requirements of the installatio n. This duty cycle time depends on the type of production and utilization facility design and is typically discussed in a plant safety analysis report.

This guidance does not apply to the emergency diesel generators (EDGs) or onsite emergency power sources own battery if provided separately (which is exclusively sized based on the starting requirement of the EDG or onsite emergency power source, such as field flas h).

Consideration of International Standards

The International Atomic Energy Agency (IAEA) works with member states and other partners to promote the safe, secure, and peaceful use of nuclear technologies. The IAEA develops safety requirements and safety guides for protecting people and the en vironment from harmful effects of ionizing radiation. This system of safety fundamentals, safety requirements, safety guides, and other relevant reports reflects an international perspective on what constitutes a high level of safety. Pursuant to the Commissions International Policy Statement (Ref. 16) and Management Directive 6.6, Regulatory Guides (Ref. 17), the NRC considered the following IAEA safety guide and safety requirement in the development of the RG:

  • IAEA Safety Guide NS-G-1.8, Design of Emergency Power Systems for Nuclear Power Plants, (Ref. 18)
  • IAEA Safety Standards Series No. SSG-34, Design of Electrical Power Systems for Nuclear Power Plants, (Ref. 19)

Although the NRC has an interest in facilitating the harmonizat ion of standards used domestically and internationally, the agency does not specifically endorse t he IAEA documents listed above and is only acknowledging that such documents may be a useful reference for general information.

Documents Discussed in Staff Regulatory Guidance

This RG endorses, in part, the use of one or more codes or sta ndards developed by external organizations, and other third-party guidance documents. These codes, standards and third-party guidance documents may contain references to other codes, standards, or third-party guidance documents (secondary references). If a secondary reference has itself been incorporated by reference into NRC

regulations as a requirement, then licensees and applicants mus t comply with that standard as set forth in the regulation. If the secondary reference has been endorsed in a RG as an acceptable approach for meeting an NRC requirement, then the standard constitutes a met hod acceptable to the NRC staff for meeting that regulatory requirement as described in the specific RG. If the secondary reference has neither been incorporated by refe rence into NRC regulations nor endorsed in a RG, then the secondary reference is neither a legally-binding requirement nor a gener ic NRC-approved acceptable approach for meeting an NRC requirement. However, licensees and applicants m ay consider and use the information in

RG 1.212, Rev. 2, Page 5 the secondary reference, if appropriately justified, consistent with current regulatory practice, and consistent with applicable NRC requirements.

RG 1.212, Rev. 2, Page 6 C. STAFF REGULATORY GUIDANCE

The staff finds that IEEE Std. 485-2020 provides methods accept able to the NRC staff for complying with the design requirements for stationary battery a pplications in full-float operation for production and utilization faciliti es, subject to the following limitations and a clarification:

1. Annex A to IEEE Std. 485-2020 is i nformative and provides sampl e sizing demonstrations.

Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020

does not include endorsement of this annex.

2. Annex B to IEEE Std. 485-2020 is i nformative and provides a method for estimating battery terminal voltage at various point s in the battery duty cycle using the manufacturers typical discharge characteristics. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not inc lude endorsement of this anne x.

3. Annex C to IEEE Std. 485-2020 is i nformative and provides a method for considering other cell types when selecting a battery for its intended application. Un less otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.

4. Annex D to IEEE Std. 485-2020 is i nformative and provides a method for sizing a battery properly for a constant power application and for converting fr om either constant power loads or constant resistance loads to constant current. Unless otherwise stated in a separate regulatory position, endorsement of IEEE St d. 485-2020 does not include en dorsement of this annex.

5. Annex E to IEEE Std. 485-2020 is i nformative and provides a method for describing the construction and use of the batte ry discharge characteristics curve. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.

6. Annex F to IEEE Std. 485-2020 is i nformative and provides a method for addressing random loads and their application in the battery sizing process. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex.

7. Annex G to IEEE Std. 485-2020 is a full-size worksheet, Sizing Lead-Acid Batteries for Stationary Applications, and is endorsed as an accepted method for sizing lead-acid batteries.

8. Annex H to IEEE Std. 485-2020 is i nformative and provides the b ibliography. Unless otherwise stated in a separate regulatory position, endorsement of IEEE S td. 485-2020 does not include endorsement of this annex.

9. The safety analysis report should discuss the battery duty cycl e span. For active designs, the battery duty cycle should cover both DBA and SBO scenarios (wit h a permitted load shedding scheme). The minimum duty cycle for active designs for DBAs sho uld be 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

RG 1.212, Rev. 2, Page 7

D. IMPLEMENTATION

The NRC staff may use this regulatory guide as a reference in its regulatory processes, such as licensing, inspection, or enforcement. However, the NRC staff d oes not intend to use the guidance in this RG to support NRC staff actions in a manner that would constitu te backfitting as that term is defined in

10 CFR 50.109, Backfitting, and as described in NRC Management Directive 8.4, Management of Backfitting, Forward Fitting, Issue Finality, and Information R equests, (Ref. 20), nor does the NRC staff intend to use the guidance to affect the issue finality of an approval under 10 CFR Part 52, Licenses, Certifications, and Approvals for Nuclear Power Plants. The staff also does not intend to use the guidance to support NRC staff ac tions in a manner that constitu tes forward fitting as that term is defined and described in Management Directive 8.4. If a licensee believ es that the NRC is using this regulatory guide in a manner inconsistent with the discussion in this Impl ementation section, then the licensee may file a backfitting or forward fitting appeal with the NRC in ac cordance with the process in Management Directive 8.4.

RG 1.212, Rev. 2, Page 8 REFERENCES 1

1. Institute of Electrical and Electronics Engineers (IEEE) Standa rd (Std.) 485-2020, IEEE

Recommended Practice for Sizing Lead-Acid Batteries for Station ary Applications, Piscataway, New Jersey.2

2. U.S. Code of Federal Regulations (CFR), Domestic Licensing of Production and Utilization Facilities, Part 50, Chapter I, Title 10, Energy.

3. CFR, Licenses, Certifications, and Approvals for Nuclear Power Plants, Part 52, Chapter I,

Title 10, Energy.

4. U.S. NRC, NUREG-0800, Standard R eview Plan for the Review of S afety Analysis Reports for Nuclear Power Plants: LWR Edition, Section 8.3.2, DC Power Sy stems (Onsite),

Washington, DC. (ADAMS Accession No. ML100740391)

5. NRC, RG 1.129, Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Production and Utilization Facilities, Washingto n, DC.

6. IEEE Std. 450, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications, Piscataway, New Jersey.

7. NRC, RG 1.128, Installation Design and Installation of Vented Lead-Acid Storage Batteries for Nuclear Power Plants, Washington, DC.

8. IEEE Std. 484, IEEE Recommended Practice for Installation Desi gn and Installation of Vented Lead-Acid Batteries for Stationary Applications, Piscataway, New Jersey.

9. NRC, NUREG-1537, Parts 1 and 2, Guidelines for Preparing and R eviewing Applications for the Licensing of Non-Power Reactors, Washington, DC, February 1996. (ML12156A069 and ML12156A075, respectively)

10. NRC, Final Interim Staff Guid ance Augmenting NUREG-1537, Guid elines for Preparing and Reviewing Applications for the Licensing of Non-Power Reactors, Parts 1 and 2, for Licensing Radioisotope Production Facilities and Aqueous Homogeneous Reac tors, Washington, DC,

October 17, 2012. (ML12156A053)

11. NRC, Endorsement of Appendix A to Oak Ridge National Laboratory Report, Proposed Guidance for Preparing and Reviewing a Molten Salt Non-Power Reactor Application, as

1 Publicly available NRC published documents are available electronically through the NRC Library on the NRCs public website at http://www.nrc.gov/reading-rm/doc-collections/ and through the NRCs Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html. For problems with ADAMS, contact the Public Document Room staff at 301-415-4737 or (800) 397-4209, or email pdr.resource@nrc.gov. The NRC Public Document Room (PDR), where you may also examine and order copies of publicly available documents, is open by appointment. To make an appointment to visit the PDR, please send an email to PDR.Resource@nrc.gov or call 1-800-397-

4209 or 301-415-4737, between 8 a.m. and 4 p.m. eastern time (ET), Monday through Friday, except Federal holidays.

2 Copies of Institute of Electrical and Electronics Engineers (IEEE) documents may be purchased from the Institute of Electrical and Electronics Engineers Service Center, 445 Hoes L ane, PO Box 1331, Piscataway, NJ 08855 or through the IEEEs public Web site at http://www.ieee.org/publications/index.html.

RG 1.212, Rev. 2, Page 9 Guidance for Preparing Applications for the Licensing of Non-Po wer Liquid Fueled Molten Salt Reactors, Washington, DC, November 18, 2020. (ML20251A008)

12. Oak Ridge National Laboratory, ORNL/TM-2020/1478, Proposed Gui dance for Preparing and Reviewing a Molten Salt Non-Power Reactor Application, Oak Ridge, Tennessee, July 2020.

(ML20219A771)

13. IEEE/American Society of Heating, Refrigerating and Air Conditi oning Engineers (ASHRAE),

IEEE/ASHRAE 1635-2022, Guide for the Ventilation and Thermal M anagement of Batteries for Stationary Applications, Piscataway, New Jersey.

14. IEEE Std. 1187, IEEE Recommended Practice for Installation Des ign and Installation of Valve-Regulated Lead-Acid Storage Batteries for Stationary Appl ications, Piscataway, New Jersey.

15. IEEE Std. 1188, IEEE Recommended Practice for Maintenance, Tes ting, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications, Piscataway, New Jersey.

16. NRC, Nuclear Regulatory Commiss ion International Policy Statement, Federal Register, Vol. 79, No. 132, July 10, 2014, pp. 39415-39418.

17. NRC, Management Directive 6.6, Regulatory Guides, Washington, DC.

18. International Atomic Energy Agency (IAEA) Safety Guide NS-G-1.8, Design of Emergency Power Systems for Nuclear Power Plants, IAEA, Vienna, Austria, 2004.3

19. IAEA, Safety Standards Series No. SSG-34, Design of Electrical Power Systems for Nuclear Power Plants, IAEA, Vienna, Austria, 2016.

20. NRC, Management Directive 8.4, Management of Backfitting, Forw ard Fitting, Issue Finality, and

=

Information Requests

=

, Washington, DC.

3 Copies of International Atomic Energy Agency (IAEA) documents may be obtained through their Web site:

www.IAEA.org/ or by writing the International Atomic Energy Agency, P.O. Box 100 Wagramer Strasse 5, A-1400 Vienna, Austria.

RG 1.212, Rev. 2, Page 10


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