05000220/FIN-2012005-02
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inadequate Post Maintenance Test Results in Subsequent Failure of 11 CREVS Fan |
| Description | A self-revealing Green NCV of TS 6.4.1 occurred because NMPNS failed to develop an adequate post maintenance test (PMT) to determine operability of the 11 control room emergency ventilation system. Specifically, troubleshooting on December 2 failed to identify a cause of the failure and an inadequate PMT was performed to determine operability. As a result the degraded system was returned to service even though it did not meet all the requirements for operability. The limiting condition for operation (LCO) was exited incorrectly, and the issue was not identified and resolved until subsequent surveillance testing. Following subsequent surveillance testing, the degraded circuit was repaired and a successful PMT was performed. The issue was entered into NMPNS CAP as CR-2012- 011027. This finding is more than minor because it adversely affected the structure, system, and component (SSC) and barrier performance attribute of the Barrier Integrity Cornerstone and affected the cornerstone objective of providing reasonable assurance that physical design barriers protect the operators in the control room from radionuclide releases caused by accidents or events. The finding was evaluated in accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibit 3 of IMC 0609, Appendix A. The inspectors determined that this finding is of very low safety significance (Green) because the performance deficiency only represented a degradation of the radiological barrier function provided for the control room. This finding has a cross-cutting aspect in the area of problem identification and resolution, because NMPNS failed to thoroughly evaluate the problem such that the resolution addressed the cause. Specifically, if NMPNS would have identified the cause of the problem and performed an adequate PMT, the system would not have been restored with a degraded condition |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2012005 Section 1R19 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | D Dempsey K Kolaczyk G Dentel P Presby S Kennedy B Sienel M Schneider E Burket B Dionne E Miller |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
| ' | |
Finding - Nine Mile Point - IR 05000220/2012005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Nine Mile Point) @ 2012Q4
Self-Identified List (Nine Mile Point)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||