05000317/FIN-2010007-02
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Finding | |
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Title | Postulated Sinqle Spurious Operation Results in Both Pressurizer Pilot Operated Relief Valves Openino and Loss of Subcoolinq Marqin for Several Hours |
Description | Appendix R to 10 CFR 50, Fire Protection Program for Nuclear Power Facilities Operating Prior to January 1, 1979, Section lll.L.1 requires in part that alternative shutdown capability provided for a specific fire area shall be able to maintain reactor coolant inventory. Contrary to the above, on December 15, 2010, the NRC identified that CENG did not meet this requirement for the Unit 1 and Unit 2 cable spreading room fire areas and failed to maintain reactor coolant inventory during a postulated fire-induced circuit failure resulting in the spurious opening of both PORVS. The violation existed since November 24,1997, when results from calculation CA04007, Appendix R Analysis of Inadvertent Lifting of Both Pressurizer PORVS, determined that a potential unrecoverable condition existed in the reactor for a postulated fire scenario. CENG is in transition to NFPA 805 and therefore the NRC-identified violation was evaluated in accordance with the criteria established by Section A of the NRC's Interim Enforcement Policy Regarding Enforcement Discretion for Certain Fire Protection lssues (10 CFR Part 50.48) for a licensee in NFPA 805 transition. Specifically, although the NRC identified the violation, it is likely that CENG would have identified and corrected this issue as part of the transition to NFPA 805, CENG entered the issue into the corrective action program (CR 2010-012760), CENG implemented compensatory measures in a reasonable time commensurate with the risk significance, the issue was not likely to have been previously identified by routine CENG efforts, and the violation was not willful. Because all the criteria were met, the NRC is exercising enforcement discretion for this issue. |
Site: | Calvert Cliffs |
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Report | IR 05000317/2010007 Section 1R05 |
Date counted | Dec 31, 2010 (2010Q4) |
Type: | Violation: Green |
cornerstone | Initiating Events |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.05 |
Inspectors (proximate) | C Cahill D Orr J Rogge K Young R Fuhrmeister |
INPO aspect | |
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Finding - Calvert Cliffs - IR 05000317/2010007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2010Q4
Self-Identified List (Calvert Cliffs)
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