05000254/FIN-2011002-01
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Finding | |
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| Title | |
| Description | The NRC inspectors identified a finding of very low safety significance (Green) and an associated NCV of 10 CFR 50, Appendix B, Criterion V on December 21, 2010. While observing performance of QCOS 0250-01, MSIV [Main Steam Isolation Valve] Scram Sensor Channel Functional Test, inspectors identified that the licensees surveillance procedure unacceptably preconditioned the reactor protection system (RPS) B limit switches during testing of the RPS A switches, in that, the A switch testing also moved the Bswitches. The licensee had not previously evaluated the pre-conditioning to determine potential impact to the test and subsequently validated the inspectors assessment that the test methodology did unacceptably precondition the B RPS limit switches. The issue was documented in the corrective action program as Issue Report 1155212. The procedure was revised and subsequent retesting on March 26 and 27, 2011, demonstrated that all MSIV RPS limit switches were operable. This issue was more than minor because, if left uncorrected, the performance deficiency would have the potential to lead to a more significant safety concern in that preconditioning could mask a condition which would prevent an automatic actuation of RPS on MSIV closure. Inspectors performed the SDP phase 1 screening using IMC 0609, Attachment 4, Table 4a, Mitigating Systems Cornerstone column, and answered all questions No. Therefore, this finding is Green, or very low safety significance. The issue was considered a legacy issue and no cross-cutting aspect was assigned |
| Site: | Quad Cities  |
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| Report | IR 05000254/2011002 Section 1R22 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | R Orlikowski C Matthews M Ring J Mcgee B Cushman J Draper |
| INPO aspect | |
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Finding - Quad Cities - IR 05000254/2011002 | |||||||||||||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2011Q1
Self-Identified List (Quad Cities)
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