05000277/FIN-2015008-01
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Finding | |
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Title | Failure to Initiate IRs for Out-of-Calibration SPVs |
Description | The inspectors identified a finding of very low safety significance (Green) because PBAPS did not initiate issue reports (IR) to identify out-of-tolerance conditions for a number of single point vulnerability (SPV) instruments. An SPV instrument is any instrument for which a single failure could initiate a plant transient or cause a plant scram. Specifically, during routine preventative maintenance (PM) calibrations, certain SPV instruments as-found data was found outside expected tolerance bands, with many being significantly outside of their bands. In most cases, IRs were not written to document these adverse conditions contrary to station guidance. The finding is determined to be more than minor because it affected the reliability of the initiating cornerstones attribute of equipment performance and affected its objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during power operations. Specifically, by not identifying and trending out-of calibration SPVs in a timely manner, a resulting transient from the loss of a single feed pump or a single reactor recirculation pump is more likely to occur. The inspectors conducted a Phase 1 screening in accordance with NRC Inspection Manual Chapter (IMC) Attachment 0609.04, Phase 1 Initial Screening and Characterization of Findings, and determined that the finding was of very low safety significance (Green) because the finding did not cause a reactor trip and the loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition (e.g. loss of condenser, loss of feed water.) A loss of a single feed pump or a single recirculation pump typically results in a power reduction but not a reactor scram. The inspectors determined that the finding had a cross-cutting aspect in the area of Problem Identification and Resolution, Identification. In the case of the finding, PBAPS did not ensure that degraded conditions, namely, out of tolerance SPV instruments, were promptly reported and documented in the corrective action program at a low threshold. |
Site: | Peach Bottom ![]() |
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Report | IR 05000277/2015008 Section 4OA2 |
Date counted | Jun 30, 2015 (2015Q2) |
Type: | Finding: Green |
cornerstone | Initiating Events |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | B Smith F Bower J Petch M Orr |
CCA | P.1, Identification |
INPO aspect | PI.1 |
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Finding - Peach Bottom - IR 05000277/2015008 | |||||||||||||||||||||||||
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Finding List (Peach Bottom) @ 2015Q2
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