05000346/FIN-2010008-04
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Finding | |
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Title | |
Description | On March 12, 2010, during UT of CRDM nozzles, the licensee identified nozzles, which did not meet acceptance criteria. Additionally, during BMV examination of the outer surface of the RVCH, the licensee identified boric acid deposits indicative of RCS leakage. The direct cause of this event was PWSCC of the CRDM nozzles and J-groove welds and the license identified and repaired a total of 24 CRDM nozzles with PWSCC in the nozzle or J-groove welds. Because the PWSCCs identified were well below crack sizes required for nozzle ejection and there was no discernable head wastage, the licensee concluded that this issue was of very low safety significance. The team evaluated the safety significance of this cracking (Section 4OA3.4) and concluded that the cracking was identified early such that plant safety was not challenged. This event was reviewed in-depth by the team as discussed within each section of this report. The NRC determined that past operation with CRDM nozzle leakage was a violation of TS 3.4.13 RCS Operational Leakage and applied enforcement discretion to not issue a violation for this issue as discussed in the following report section. Documents reviewed as part of this inspection are listed in Attachment 1. LER 05000346/2010-002-00 is closed. |
Site: | Davis Besse |
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Report | IR 05000346/2010008 Section 4OA5 |
Date counted | Sep 30, 2010 (2010Q3) |
Type: | Violation: Severity level Enforcement Discretion |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 93812 |
Inspectors (proximate) | T Bilik J Rutkowski A Wilson D Hills A Shaikh C Nove J Collins M Holmberg J Jandovitz |
INPO aspect | |
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Finding - Davis Besse - IR 05000346/2010008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Davis Besse) @ 2010Q3
Self-Identified List (Davis Besse)
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