05000324/FIN-2008004-04
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Finding | |
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Title | Licensee-Identified Violation |
Description | 10 CFR 50.65(a)(4) states, in part, that before performing maintenance activities, the licensee shall assess and manage the risk that may result from the proposed maintenance activities. Contrary to the above, the licensee did not perform an adequate risk assessment of switchyard activities which involved operating a test device in the generator terminal current sensing circuitry in the switchyard relay house. Unit 2 automatically scrammed due to a spurious power load unbalance (PLU) turbine trip signal while the unit was in operation at 100% rated thermal power. This spurious signal was determined to be generated from the maintenance activities in the switchyard. The licensee determined that procedure 0AP-025 BNP Integrated Scheduling, which was used to implement Engineering Change, 68642, Digital Fault Recorder Replacement (Switchyard), did not adequately evaluate the post modification testing to be performed on the PLU circuit, and therefore did not characterize the maintenance as a contributor to the risk of a plant transient or reactor scram. The finding is of very low safety significance because the incremental core damage probability deficit is less than 1E-6 and the incremental large early release probability deficit is less than 1E-7. This issue has been entered into the CAP as AR 294164 |
Site: | Brunswick |
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Report | IR 05000324/2008004 Section 4OA7 |
Date counted | Sep 30, 2008 (2008Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | J Austin R Moore R Musser R Lewis C Even M Coursey G Kolcum B Collins J Eargle |
INPO aspect | |
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Finding - Brunswick - IR 05000324/2008004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Brunswick) @ 2008Q3
Self-Identified List (Brunswick)
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