05000400/FIN-2009006-02
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Finding | |
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Title | Failure to Correct a Condition Adverse to Quality Involving a Main Steam Isolation Valve Degrading Trend Before Valve Failure |
Description | The team identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion XVI, \"Corrective Action,\" for the licensees failure to correct a condition adverse to quality in a timely manner. Specifically, between May 27, 1997 and September 29, 2007, Main Steam Isolation Valve 82 close stroke time exhibited a condition adverse to quality for a trend degrading towards the technical specification limit, without sufficient corrective actions to prevent failure. This resulted in Main Steam Isolation Valve 82 exceeding the five-second stroke time limit required in Technical Specification 3.7.1.5. The licensee entered this issue into the corrective action program as nuclear condition report 358464. This finding is more than minor because it is associated with the containment barrier performance attribute of the Barrier Integrity Cornerstone and affects the cornerstone objective of providing reasonable assurance that physical design barriers, such as the main steam isolation valve radiological release barrier required for a steam generator tube rupture, protect the public from radionuclide releases caused by accidents or events. Using Manual Chapter 0609.04, \"Phase 1 Initial Screening and Characterization of Findings,\" the finding was determined to have a very low safety significance because it did not represent a degradation of the radiological barrier function provided for the control room, auxiliary building, or spent fuel pool; the finding did not represent a degradation of the barrier function of the control room against smoke or a toxic atmosphere; the finding did not represent an actual open pathway in the physical integrity of reactor containment; and the finding did not involve an actual reduction in function of the hydrogen igniters in the reactor containment. This finding had a cross-cutting aspect in the area of human performance associated with decisionmaking because the licensee did not use conservative assumptions so that safety-significant decisions were verified to validate underlying assumptions and identify unintended consequences (H.1.(b)) (Section 4OA2.a(3)(ii)) |
Site: | Harris ![]() |
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Report | IR 05000400/2009006 Section 4OA2 |
Date counted | Dec 31, 2009 (2009Q4) |
Type: | NCV: Green |
cornerstone | Barrier Integrity |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | R Taylor D Merzke P Niebaum M Catts P Lessard E Stamm |
CCA | H.14, Conservative Bias |
INPO aspect | DM.2 |
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Finding - Harris - IR 05000400/2009006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Harris) @ 2009Q4
Self-Identified List (Harris)
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