05000456/FIN-2009005-10
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Finding | |
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Title | Licensee-Identified Violation |
Description | 10 CFR 50.65 requires, in part, that the licensee shall assess and manage the increase in risk from the proposed maintenance activities before performing maintenance. Contrary to this, on November 16, 2009, the licensee failed to manage the increase in risk during the 2B AF pump suction pressure calibration. Specifically, for nearly 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, dedicated personnel were not present to restore the instrumentation if it were needed, which renders the 2B AF pump unavailable. This resulted in an unplanned change from Green to Yellow risk. Upon discovery, the licensee immediately assigned continuous dedicated personnel for the remainder of the surveillance. The finding is of very low safety significance because the Incremental Core Damage Probability is not greater than 1E-6. The licensee entered this issue into their CAP as IR 994317 and was also written as a Prompt Investigation Report |
Site: | Braidwood |
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Report | IR 05000456/2009005 Section 4OA7 |
Date counted | Dec 31, 2009 (2009Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | A Garmoe B Dickson B Metrow B Palagi J Gall M Holmberg M Mitchell M Perry R Jickling R Ng R Skokowski |
INPO aspect | |
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Finding - Braidwood - IR 05000456/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2009Q4
Self-Identified List (Braidwood)
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