05000400/FIN-2011008-03
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Finding | |
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Title | Failure to Maintain Environmental Qualification on Steam Generator Power Operated Relief Valves |
Description | The team identified a Green, NCV of 10 CFR 50.49 for the licensees failure to maintain its Environmental Qualification (EQ) program requirements on the Steam Generator Power Operated Relief Valves (S/G PORVs). While no immediate operability issues were identified, the licensee entered this issue into the CAP as NCR 459807. The licensee plans to properly place the components in the appropriate program. The licensees failure to maintain its EQ program requirements on the S/G PORVs was a performance deficiency. This finding was considered more than minor because it affected the Mitigating Systems cornerstone attribute of equipment performance to ensure the availability, reliability, and capability of safety systems that respond to initiating events to prevent undesirable consequences. Specifically, the S/G PORVs are required as per the steam line break analysis in Updated Final Safety Analyses Report (UFSAR) Chapter 15 to mitigate the radiological consequences of a steam line break by allowing the RCS to be cooled to the point where the residual heat removal (RHR) system can be placed in service within eight hours and be brought to cold shutdown within 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> after the accident. Removing the S/G PORVs from the EQ program reduced the reliability such that these valves would remain functional following a steam line break, which can subject them to a harsh environment. The finding was of very low safety significance because it was a qualification deficiency confirmed not to result in the loss of operability or functionality. The team determined that no cross cutting aspect was applicable to this performance deficiency because this finding was not indicative of current licensee performance. |
Site: | Harris |
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Report | IR 05000400/2011008 Section 1R21 |
Date counted | Jun 30, 2011 (2011Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | S Walker C Baron G Skinner P Higgins D Mas-Penaranda R Patterson B Desai D Terri-Ward |
INPO aspect | |
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Finding - Harris - IR 05000400/2011008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Harris) @ 2011Q2
Self-Identified List (Harris)
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