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{{#Wiki_filter:TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Meeting with NRC Extended Power Uprate and Transition to NFPA 805 Update Rockville, MarylandSeptember 15, 2011 AgendaIntroductionsBackgroundContainment Accident Pressure Replacement Steam DryersSubmittal and Review ScheduleNFPA 805 Transition Status 1
{{#Wiki_filter:TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Meeting with NRC Extended Power Uprate and Transition to NFPA 805 Update Rockville, Maryland September 15, 2011
BackgroundBrowns Ferry Nuclear (BFN) Extended Power Uprate (EPU) application currently under NRC review for all three units will result in 14.3 percent


increase above current licensed power.In September 2009, the NRC placed the application review on hold pending development of guidance on credit for Containment Accident Pressure (CAP).
Agenda
 
===Introductions===
Background Containment Accident Pressure Replacement Steam Dryers Submittal and Review Schedule NFPA 805 Transition Status 1
 
===
Background===
Browns Ferry Nuclear (BFN) Extended Power Uprate (EPU) application currently under NRC review for all three units will result in 14.3 percent increase above current licensed power.
In September 2009, the NRC placed the application review on hold pending development of guidance on credit for Containment Accident Pressure (CAP).
Two outstanding issues for the BFN EPU remained to be resolved:
Two outstanding issues for the BFN EPU remained to be resolved:
-CAP-Steam dryers TVA met with NRC on December 15, 2010 to:
    - CAP
-Confirm outstanding project scope
    - Steam dryers TVA met with NRC on December 15, 2010 to:
-Communicate planned CAP mitigation strategy relative to draft NRC guidelines
    - Confirm outstanding project scope
-Communicate plans for steam dryers 2
    - Communicate planned CAP mitigation strategy relative to draft NRC guidelines
Background (continued)NRC guidance associated with CAP:
    - Communicate plans for steam dryers 2
-In January 2011, NRC Staff requested approval to resume review of EPU license amendment requests (LARs) using the revised CAP guidance.
-In March 2011, the Commissioners issued a memorandum that approved the revised CAP guidance provided by the Staff and allowed work on EPU LARs to resume.Based on issuance of NRC guidance on CAP, TVA determined that submittal of key assumptions (as discussed in December 15, 2010 meeting) was not necessary.On May 15, 2011, the NRC issued a letter to TVA stating that, based on development of CAP review criteria, the NRC is prepared to resume review of


the BFN EPU application.
Background (continued)
3 Containment Accident PressureTVA identified and evaluated changes/modifications to eliminate or minimize CAP credit for limiting events, using NRC CAP guidance.At this time, using NPSHr (net positive suction head required) 3 percent curves eliminates CAP credit for the station blackout (SBO) and anticipated transient without scram (ATWS) events. The following actions are planned to eliminate CAP credit for fire events: 
NRC guidance associated with CAP:
-TVA plans to revise the Generic Letter 89-13 heat exchanger analysis and program to support taking credit for improved residual heat removal (RHR) heat exchanger performance.
    - In January 2011, NRC Staff requested approval to resume review of EPU license amendment requests (LARs) using the revised CAP guidance.
-TVA plans to increase suppression pool inventory using Condensate Storage Tank water.
    - In March 2011, the Commissioners issued a memorandum that approved the revised CAP guidance provided by the Staff and allowed work on EPU LARs to resume.
-Increased suppression pool water inventory combined with improved RHR heat exchanger performance reduces peak suppression pool temperature, increases RHR pump static head, and eliminates CAP credit.
Based on issuance of NRC guidance on CAP, TVA determined that submittal of key assumptions (as discussed in December 15, 2010 meeting) was not necessary.
4 Containment Accident Pressure (continued)NRC CAP credit guidance introduced an uncertainty adder to NPSHr  for a design basis loss-of-coolant accident (LOCA) event.The Boiling Water Reactor Owners Group (BWROG) has been developing a generic approach
On May 15, 2011, the NRC issued a letter to TVA stating that, based on development of CAP review criteria, the NRC is prepared to resume review of the BFN EPU application.
3


for addressing the NPSH uncertainty adder. TVA plans to use the BWROG approach. Improving RHR heat exchanger performance eliminates CAP credit for the long-term (i.e., >10 minutes) LOCA event.TVA plans to take CAP credit only for the short-term (i.e., <10 minutes) LOCA
Containment Accident Pressure TVA identified and evaluated changes/modifications to eliminate or minimize CAP credit for limiting events, using NRC CAP guidance.
At this time, using NPSHr (net positive suction head required) 3 percent curves eliminates CAP credit for the station blackout (SBO) and anticipated transient without scram (ATWS) events.
The following actions are planned to eliminate CAP credit for fire events:
    - TVA plans to revise the Generic Letter 89-13 heat exchanger analysis and program to support taking credit for improved residual heat removal (RHR) heat exchanger performance.
    - TVA plans to increase suppression pool inventory using Condensate Storage Tank water.
    - Increased suppression pool water inventory combined with improved RHR heat exchanger performance reduces peak suppression pool temperature, increases RHR pump static head, and eliminates CAP credit.
4


event in accordance with the NRC guidance.TVA will request formal NRC acceptance of the analysis for CAP credit for  
Containment Accident Pressure (continued)
NRC CAP credit guidance introduced an uncertainty adder to NPSHr for a design basis loss-of-coolant accident (LOCA) event. The Boiling Water Reactor Owners Group (BWROG) has been developing a generic approach for addressing the NPSH uncertainty adder.
TVA plans to use the BWROG approach.
Improving RHR heat exchanger performance eliminates CAP credit for the long-term (i.e., >10 minutes) LOCA event.
TVA plans to take CAP credit only for the short-term (i.e., <10 minutes) LOCA event in accordance with the NRC guidance.
TVA will request formal NRC acceptance of the analysis for CAP credit for short-term LOCA.
5


short-term LOCA.
Containment Accident Pressure (continued)
5 Containment Accident Pressure (continued)The following summarizes the CAP credit approach for the BFN EPU application:
The following summarizes the CAP credit approach for the BFN EPU application:
EventCurrent Need Approach Short-term LOCA (< 10 minutes)Need CAP credit for RHR and Core Spray due to run-out flow rate and suction strainer loadingRequest  formal NRC acceptance of CAP  
Event                          Current Need                                       Approach Request formal NRC acceptance of CAP Short-term LOCA Need CAP credit for RHR and Core Spray due to run-out credit
(< 10 minutes)  flow rate and suction strainer loading Long-term LOCA                                                        Eliminate CAP by improving RHR heat Need small amount of CAP credit for Core Spray
(> 10 minutes)                                                        exchanger performance Eliminate CAP by improving RHR heat Fire Protection Need large amount of CAP credit for RHR              exchanger performance and increasing suppression pool inventory SBO      CAP credit not required                              CAP credit not required ATWS      CAP credit not required                              CAP credit not required 6


creditLong-term LOCA      (> 10 minutes)
Replacement Steam Dryers In December 2009, TVA determined that NRC concerns with analyses of existing steam dryers could not be resolved, and replacement steam dryers (RSDs) would be required.
Need small amount of CAPcredit for Core SprayEliminate CAP by improving RHR heat exchanger performance Fire ProtectionNeed large amount of CAP credit for RHREliminate CAP by improving RHR heat exchanger performance and increasing suppression pool inventory SBOCAP credit not requiredCAP credit not required ATWSCAP credit not requiredCAP credit not required 6
An RSD specification was developed and provided to prospective vendors.
Replacement Steam DryersIn December 2009, TVA determined that NRC concerns with analyses of existing steam dryers could not be resolved, and replacement steam dryers (RSDs) would be required. An RSD specification was developed and provided to prospective vendors.
The RSD work scope consists of three phases:
The RSD work scope consists of three phases:
-Phase I, Design and Analysis
    - Phase I, Design and Analysis
-Phase II, Fabrication
    - Phase II, Fabrication
-Phase III, InstallationNegotiations are in progress with General Electric Hitachi for RSD design, analysis, fabrication, and installation.
    - Phase III, Installation Negotiations are in progress with General Electric Hitachi for RSD design, analysis, fabrication, and installation.
7 Submittal and Review ScheduleThe proposed EPU schedule is based on overall resource and risk considerations for TVA.The EPU schedule assumes the following:  
7
-RSD analysis and design will not begin until the formal acceptance of the CAP analysis by the NRC.
 
-RSD fabrication will not begin until NRC issues the EPU amendment.
Submittal and Review Schedule The proposed EPU schedule is based on overall resource and risk considerations for TVA.
8 Submittal and Review Schedule (continued)
The EPU schedule assumes the following:
TVA SubmittalsEPU CAP Analysis Report May 2012-Schedule assumes BWROG input is receivedin March 2012
    - RSD analysis and design will not begin until the formal acceptance of the CAP analysis by the NRC.
-TVA will request NRC formal acceptance of CAP Analysis ReportEPU Steam Dryer Analysis ReportSpring 2014NRC Review ExpectationsAcceptance of CAP Analysis Report Spring 2013Issue EPU Amendment 2015 9 NFPA 805 Transition StatusMajor Milestones AchievedNFPA Code compliance evaluationsNuclear safety capability assessment (NSCA) component selection, logics, cable selection, and cable routing (final owner reviews pending)Scoping fire modeling (generic treatments calculation)
    - RSD fabrication will not begin until NRC issues the EPU amendment.
Remaining Major MilestonesFire PRA completion (including peer review)Fire area assessments and variance from deterministic requirements (VFDR)
8
 
Submittal and Review Schedule (continued)
TVA Submittals EPU CAP Analysis Report                       May 2012
    - Schedule assumes BWROG input is received in March 2012
    - TVA will request NRC formal acceptance of CAP Analysis Report EPU Steam Dryer Analysis Report                Spring 2014 NRC Review Expectations Acceptance of CAP Analysis Report             Spring 2013 Issue EPU Amendment                           2015 9


resolutionsFire risk evaluationsLAR preparation and submittal 10}}
NFPA 805 Transition Status Major Milestones Achieved NFPA Code compliance evaluations Nuclear safety capability assessment (NSCA) component selection, logics, cable selection, and cable routing (final owner reviews pending)
Scoping fire modeling (generic treatments calculation)
Remaining Major Milestones Fire PRA completion (including peer review)
Fire area assessments and variance from deterministic requirements (VFDR) resolutions Fire risk evaluations LAR preparation and submittal 10}}

Revision as of 14:50, 12 November 2019

09/15/11 Proposed Meeting Slides for Forthcoming Meeting with Tennessee Valley Authority Regarding Status of Extended Power Uprate Submittal
ML11257A034
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 09/15/2011
From:
Tennessee Valley Authority
To: Gratton C
Office of Nuclear Reactor Regulation
Gratton, Christopher
References
Download: ML11257A034 (15)
v • d • e


Text

TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Meeting with NRC Extended Power Uprate and Transition to NFPA 805 Update Rockville, Maryland September 15, 2011

Agenda

Introductions

Background Containment Accident Pressure Replacement Steam Dryers Submittal and Review Schedule NFPA 805 Transition Status 1

=

Background===

Browns Ferry Nuclear (BFN) Extended Power Uprate (EPU) application currently under NRC review for all three units will result in 14.3 percent increase above current licensed power.

In September 2009, the NRC placed the application review on hold pending development of guidance on credit for Containment Accident Pressure (CAP).

Two outstanding issues for the BFN EPU remained to be resolved:

- CAP

- Steam dryers TVA met with NRC on December 15, 2010 to:

- Confirm outstanding project scope

- Communicate planned CAP mitigation strategy relative to draft NRC guidelines

- Communicate plans for steam dryers 2

Background (continued)

NRC guidance associated with CAP:

- In January 2011, NRC Staff requested approval to resume review of EPU license amendment requests (LARs) using the revised CAP guidance.

- In March 2011, the Commissioners issued a memorandum that approved the revised CAP guidance provided by the Staff and allowed work on EPU LARs to resume.

Based on issuance of NRC guidance on CAP, TVA determined that submittal of key assumptions (as discussed in December 15, 2010 meeting) was not necessary.

On May 15, 2011, the NRC issued a letter to TVA stating that, based on development of CAP review criteria, the NRC is prepared to resume review of the BFN EPU application.

3

Containment Accident Pressure TVA identified and evaluated changes/modifications to eliminate or minimize CAP credit for limiting events, using NRC CAP guidance.

At this time, using NPSHr (net positive suction head required) 3 percent curves eliminates CAP credit for the station blackout (SBO) and anticipated transient without scram (ATWS) events.

The following actions are planned to eliminate CAP credit for fire events:

- TVA plans to revise the Generic Letter 89-13 heat exchanger analysis and program to support taking credit for improved residual heat removal (RHR) heat exchanger performance.

- TVA plans to increase suppression pool inventory using Condensate Storage Tank water.

- Increased suppression pool water inventory combined with improved RHR heat exchanger performance reduces peak suppression pool temperature, increases RHR pump static head, and eliminates CAP credit.

4

Containment Accident Pressure (continued)

NRC CAP credit guidance introduced an uncertainty adder to NPSHr for a design basis loss-of-coolant accident (LOCA) event. The Boiling Water Reactor Owners Group (BWROG) has been developing a generic approach for addressing the NPSH uncertainty adder.

TVA plans to use the BWROG approach.

Improving RHR heat exchanger performance eliminates CAP credit for the long-term (i.e., >10 minutes) LOCA event.

TVA plans to take CAP credit only for the short-term (i.e., <10 minutes) LOCA event in accordance with the NRC guidance.

TVA will request formal NRC acceptance of the analysis for CAP credit for short-term LOCA.

5

Containment Accident Pressure (continued)

The following summarizes the CAP credit approach for the BFN EPU application:

Event Current Need Approach Request formal NRC acceptance of CAP Short-term LOCA Need CAP credit for RHR and Core Spray due to run-out credit

(< 10 minutes) flow rate and suction strainer loading Long-term LOCA Eliminate CAP by improving RHR heat Need small amount of CAP credit for Core Spray

(> 10 minutes) exchanger performance Eliminate CAP by improving RHR heat Fire Protection Need large amount of CAP credit for RHR exchanger performance and increasing suppression pool inventory SBO CAP credit not required CAP credit not required ATWS CAP credit not required CAP credit not required 6

Replacement Steam Dryers In December 2009, TVA determined that NRC concerns with analyses of existing steam dryers could not be resolved, and replacement steam dryers (RSDs) would be required.

An RSD specification was developed and provided to prospective vendors.

The RSD work scope consists of three phases:

- Phase I, Design and Analysis

- Phase II, Fabrication

- Phase III, Installation Negotiations are in progress with General Electric Hitachi for RSD design, analysis, fabrication, and installation.

7

Submittal and Review Schedule The proposed EPU schedule is based on overall resource and risk considerations for TVA.

The EPU schedule assumes the following:

- RSD analysis and design will not begin until the formal acceptance of the CAP analysis by the NRC.

- RSD fabrication will not begin until NRC issues the EPU amendment.

8

Submittal and Review Schedule (continued)

TVA Submittals EPU CAP Analysis Report May 2012

- Schedule assumes BWROG input is received in March 2012

- TVA will request NRC formal acceptance of CAP Analysis Report EPU Steam Dryer Analysis Report Spring 2014 NRC Review Expectations Acceptance of CAP Analysis Report Spring 2013 Issue EPU Amendment 2015 9

NFPA 805 Transition Status Major Milestones Achieved NFPA Code compliance evaluations Nuclear safety capability assessment (NSCA) component selection, logics, cable selection, and cable routing (final owner reviews pending)

Scoping fire modeling (generic treatments calculation)

Remaining Major Milestones Fire PRA completion (including peer review)

Fire area assessments and variance from deterministic requirements (VFDR) resolutions Fire risk evaluations LAR preparation and submittal 10

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