05000457/FIN-2014004-04
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Finding | |
|---|---|
| Title | Unit 2 Pressurizer Pressure Transmitter 458 Returned to Service with Instrument Isolated |
| Description | A finding of very low safety significance and an associated NCV of 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was self-revealed on May 21, 2014, when licensee personnel failed to use a quality instruction to reposition Unit 2 safety-related pressurizer pressure transmitter isolation valve 2PT458. Specifically, although the licensee identified that safety-related 2PT458 had been isolated from service and was not in service during a plant startup, as anticipated, the licensee could not locate the work instruction that isolated the instrument from service. The licensee entered this issue into their CAP as IR 1663588, Level 3 CCE2PT0458 Found Isolated. Corrective actions included restoring the pressure transmitter to service by opening a shut isolation valve and performing a causal evaluation. The inspectors determined that the performance deficiency was more than minor in accordance with IMC 0612, Appendix B, Issue Screening, because the issue was associated with the Equipment Performance attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, as a result of the performance deficiency, the automatic function of pressurizer power-operated relief valve (PORV) 2RY455A was not available for a number of days to perform its design function to mitigate an Anticipated Transient Without Scram (ATWS) event. In addition, IMC 0612, Appendix E, Examples of More than Minor Inspection Findings, Example 7e, informed this more-than-minor bases. Specifically, the issue was more than minor because it resulted in overall plant risk being in a higher risk category (i.e., Yellow vs. Green). The inspectors determined that the issue was of very low safety significance in accordance with IMC 0609, Attachment 4, Initial Characterization of Findings. In particular, Table 3, SDP Appendix Router, directed that the finding be screened using IMC 0609, Appendix A, The Significance Determination Process for At-Power Findings. The inspector answered No to all of the associated Mitigating Systems screening questions. This finding did not have an assigned cross-cutting aspect because the cause of the performance deficiency was indeterminate. |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000457/2014004 Section 1R19 |
| Date counted | Sep 30, 2014 (2014Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | B Boston D Betancourt E Duncan J Benjamin J Laughlin L Rodriguez M Learn M Perry R Edwards R Jickling T Go |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| INPO aspect | |
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Finding - Braidwood - IR 05000457/2014004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2014Q3
Self-Identified List (Braidwood)
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