ML15099A031
| ML15099A031 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 04/14/2015 |
| From: | Nadiyah Morgan Plant Licensing Branch 1 |
| To: | George Gellrich Calvert Cliffs |
| Morgan N | |
| References | |
| TAC MF4065, TAC MF4066 | |
| Download: ML15099A031 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 April 14, 2015 Mr. George H. Gellrich, Vice President Calvert Cliffs Nuclear Power Plant, LLC Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702
SUBJECT:
CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND - 2 REQUEST FOR ADDITIONAL INFORMATION REGARDING THE TECHNICAL SPECIFICATION TASK FORCE TRAVELER-425, "RELOCATE SURVEILLANCE FREQUENCIES TO LICENSEE CONTROL-RITSTF INITIATIVE 5B," REVISION 3, LICENSE AMENDMENT REQUEST (TAC NOS. MF4065 AND MF4066)
Dear Mr. Gellrich:
By letter dated May 1, 2014, Calvert Cliffs Nuclear Power Plant, LLC (the licensee) submitted a license amendment request (LAR) to adopt Revision 3 of Technical Specification Task Force Traveler - 425, "Relocate Surveillance Frequencies to Licensee Control - RITSTF Initiative 5b,
by relocating specific surveillance frequencies to a licensee-controlled program with the implementation of Nuclear Energy Institute 04-10, Revision 1, "Risk-Informed Method for Control of Surveillance Frequencies," dated April 2007 for Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2.
The Nuclear Regulatory Commission (NRC) staff is reviewing the LAR and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed request for additional information (RAI). The NRC staff is requesting a response to the RAI within 30 days of the date of this letter.
If you have any questions regarding this matter, please contact me at (301) 415-1016.
Docket Nos. 50-317 and 50-318
Enclosure:
RAI cc w/encl: Distribution via Listserv Sincerely, aiyah S. Morgan, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
REQUEST FOR ADDITIONAL INFORMATION REGARDING TECHNICAL SPECIFICATION TASK FORCE TRAVELER-425, REVISION 3, LICENSE AMENDMENT REQUEST CALVERT CLIFFS NUCLEAR POWER PLANT, LLC.
CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1AND2 DOCKET NOS. 50-317 AND 50-318 By letter dated May 1, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14125A015), Calvert Cliffs Nuclear Power Plant, LLC (the licensee) submitted a license amendment request (LAR) to adopt Revision 3 of Technical Specification Task Force Traveler - 425, "Relocate Surveillance Frequencies to Licensee Control - RITSTF Initiative Sb," by relocating specific surveillance frequencies to a licensee-controlled program with the implementation of Nuclear Energy Institute (NEI) 04-10, Revision 1, "Risk-Informed Method for Control of Surveillance Frequencies," dated April 2007 (ADAMS Accession No. ML071360456) for Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 (Calvert Cliffs). The U.S. Nuclear Regulatory Commission (NRC) staff is reviewing the LAR and has determined that additional information is needed to complete its review. The NRC staff requests the following additional information:
- 1.
Step 8 of Section 4.0 of NEI 04-10, Revision 1 states, in part, that:
The risk impact of a proposed [Surveillance Test Interval (STI)]
adjustment shall be calculated as a change of the test-limited risk (see Regulatory Guide 1.177, Section 2.3.3[i1). Since the test-limited risk is associated with failures occurring between tests, the failure rate that shall be used in calculating the risk impact of a proposed STI adjustment is the time-related failure rate associated with failures occurring while the component is in standby between tests (i.e., risk associated with the longer time to detect standby-stress failures).
Describe how the Calvert Cliffs Surveillance Frequency Control Program will address the standby (i.e., the time-related) contribution for extended surveillances.
- 2. Attachment 2 of the LAR states that Calvert Cliffs does not have a low power or shutdown probabilistic risk assessment model. A qualitative analysis of shutdown events is acceptable, as presented in the NRG-endorsed document NEI 04-10, Revision 1. Step 10 of Section 4.0 of NEI 04-10, Revision 1 provides guidance on the initial assessment of Internal Events, External Events, and Shutdown Events. Describe how shutdown events will be assessed as part of the Calvert Cliffs Surveillance Frequency Control Program.
Enclosure
ML15099A031 OFFICE LPLl-1/PM LPLl-1/LA Sincerely, IRA/
Nadiyah S. Morgan, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation RidsNrrLAKGoldstein RidsNrrPMCalvertCliffs RidsOGCMailCenter RidsRgn1 MailCenter D. Gennardo M. Chernoff
- See dated memo
- via email DSS/SRXB/BC LPLl-1 /BC (A)
NAME NMorgan KGoldstein (JBurkhardt for**)
CJackson*
MDudek DATE 4/09/2015 4/09/2015 3/25/2015 4/14/2015