05000348/FIN-2009007-01
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Finding | |
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Title | Inadequate Procedure for the B train SSPS System Testing |
Description | A self-revealing violation of 10 CFR 50 Appendix B, Criterion V Instructions, Procedures, and Drawings, was identified for an inadequate procedure for testing the B train solid state protection system (SSPS) (FNP-1- STP-33.3). While Unit 1 was in Mode 5 and N31 source range instrumentation was tagged out and unavailable, the licensee performed step 5.6.1.1B of FNP-1- STP-33.3, resulting in N32 source range instrument being de-energized. Procedure FNP-1-STP-33.3 inadvertently de-energized the only operable source range instrument for Unit 1. TS 3.3.1 required a minimum of one source range neutron flux monitor with the plant in this condition. When the licensee recognized this condition, they immediately restored power to N32 and exited the TS action. The licensee initiated condition report (CR) 2009105672 to address this issue. The issue was more than minor because it was associated with the procedure quality attribute of the mitigating systems cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the SSPS procedure resulted in a total loss of source range instrumentation during testing. This affected the safety function of source range neutron flux indication in Mode 5. This finding was assessed using the Phase 1 and 2 Shutdown Operations screening worksheet of the SDP and was determined to require a Phase 3 analysis because the finding involved a loss of source range monitors while shutdown. This finding was determined to be of very low safety significance because the dominant sequence is a boron dilution event and de-energizing the source range for less than a minute would not prevent an operator from taking the necessary actions to address potential boron dilution. No cross-cutting issue was identified. (Section 4OA2.a.(3)) |
Site: | Farley ![]() |
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Report | IR 05000348/2009007 Section 4OA2 |
Date counted | Dec 31, 2009 (2009Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Self-revealing |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | R Taylor S Ninh S Sandal D Merzke T Lighty W Deschaine |
INPO aspect | |
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Finding - Farley - IR 05000348/2009007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Farley) @ 2009Q4
Self-Identified List (Farley)
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