05000219/FIN-2009007-02
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Finding | |
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| Title | Inadequate Design Control or RBCCW Containment Isolation Valve Modification |
| Description | The team identified a finding of very low safety significance involving a non-cited violation of 10 CFR 50, Appendix B, Criterion III, Design Control, in that Exelon did not ensure the adequacy of a reactor building closed cooling water system containment isolation check valve design. Specifically, Exelon modified the check valve but did not ensure that the replacement valve could meet the existing design basis temperature value. In response, Exelon entered the issue in their corrective action program and evaluated the design temperature of the check valve to assure the valve would function properly during postulated events. The finding is more than minor because it is associated with the design control attribute of the Barrier Integrity Cornerstone and affected the cornerstone objective of providing reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. The team determined the finding screened as very low safety significance (Green) because it did not represent a degradation of the radiological barrier function provided for the control room, auxiliary building, or spent fuel pool, did not represent a degradation of the barrier function of the control room against smoke or a toxic atmosphere, did not represent an actual open pathway in the physical integrity of reactor containment, and did not involve an actual reduction in function of hydrogen igniters in the reactor containment. This finding has a cross-cutting aspect in the area of Human Performance, Work Practices Component, because Exelon did not define and effectively communicate expectations regarding procedural compliance and personnel did not follow procedures. Specifically, Exelon did not comply with procedure CC-AA-102, Design Input and Configuration Change Impact Screening, to evaluate the design temperature of the newly installed check valve to ensure that all affected systems can perform their design basis functions. (IMC 0305, Aspect H.4(b) |
| Site: | Oyster Creek |
|---|---|
| Report | IR 05000219/2009007 Section 1R17 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.17 |
| Inspectors (proximate) | L Scholl R Moore S Pindale M Balazik L Doerflein |
| CCA | H.8, Procedure Adherence |
| INPO aspect | WP.4 |
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Finding - Oyster Creek - IR 05000219/2009007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Oyster Creek) @ 2009Q2
Self-Identified List (Oyster Creek)
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