05000456/FIN-2009003-07
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Finding | |
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Title | Bryozoan Infestation at the lake Screenhouse Circulating Water forebays |
Description | The inspectors identified a NCV of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action Program, having very low safety significance, associated with the licensee\'s failure to identify a significant condition adverse to quality and to develop corrective actions to prevent recurrence. Specifically, the licensee failed to identify the October 2005 bryozoa infestation as a significant condition adverse to quality and did not establish corrective actions to preclude recurrence. This was evidenced by the September 2008 accumulation of bryozoan colonies in the SX and Circulating Water System forebays that resulted in the SX system strainer plugging and hence represented a challenge to the reliability and operability of the SX system. The licensee entered this performance deficiency into their corrective action program. The finding is greater than minor because the failure to identify the significant condition adverse to quality and to develop corrective actions to prevent recurrence affected the Mitigating Systems Cornerstone objective of ensuring the availability, capability and reliability of the Unit 1 and Unit 2 SX trains to respond to initiating events to prevent undesirable consequences. The finding is of very low safety significance because based on the results of an analysis performed by the licensee, which concluded that, even under severely degraded flow conditions, the affected trains of SX would have provided sufficient cooling to components served by the SX system following a reactor trip, a loss of coolant accident, or a loss of offsite power. The primary cause of the finding was related to the cross-cutting element of Human Performance and the associated attribute of decision making (H.1(b)). |
Site: | Braidwood ![]() |
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Report | IR 05000456/2009003 Section 4OA3 |
Date counted | Jun 30, 2009 (2009Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71153 |
Inspectors (proximate) | A Garmoe B Dickson M Holmberg M Mitchell M Perry M Thorpe Kavanaugh R Jones R Ng R Skokowski T Hartman |
CCA | H.14, Conservative Bias |
INPO aspect | DM.2 |
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Finding - Braidwood - IR 05000456/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2009Q2
Self-Identified List (Braidwood)
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