05000333/FIN-2015001-02
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Finding | |
|---|---|
| Title | Inadequate Preventive Maintenance Strategy and Test Procedure for RWR MG Resulted in Multiple Plant Transients |
| Description | A self-revealing, Green NCV of Technical Specification (TS) 5.4, Procedures, was identified for failure to institute appropriate processes and procedures for periodic maintenance activities of the reactor water recirculation motor generators (RWR MGs). During startup from refueling outage 21, degraded material conditions led to tripping of an RWR MG, with the resultant loss of the associated RWR pump and down power transient, on three occasions. Specifically, one trip was due to carbon dust buildup within the A RWR MG exciter, and two trips were due to a high resistance connection between the B RWR MG generator field winding and a slip ring. Additionally, a fourth trip occurred during performance of an inadequately prepared RWR MG test procedure. As corrective action, the high resistance connection associated with the B RWR MG was eliminated, voltage regulator tuning for the B RWR MG was successfully completed, and temporary instrumentation was connected to both RWR MGs to monitor various key parameters pending the implementation of long term corrective actions. The RWR MG trips were entered into the corrective action program (CAP) through individual condition reports (CRs) that were subsequently consolidated under CR-JAF-2014-06258 for root cause evaluation (RCE). The finding was more than minor because it was associated with the Equipment Performance attribute of the Initiating Events cornerstone and adversely affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the transient initiation of single RWR loop operations challenges the reactor feedwater and vessel level control systems such that a more significant plant transient could result, and challenges plant operators in establishing allowable single RWR loop operating conditions. In accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibit 1 of IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, the inspectors determined that the finding was of very low safety significance (Green) because the performance deficiency was a transient initiator that 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. The finding had a cross-cutting aspect in the area of Human Performance, Resources, because FitzPatrick staff did not ensure that procedures for RWR preventive maintenance (PM) and voltage regulator tuning were adequate to support nuclear safety. |
| Site: | FitzPatrick  |
|---|---|
| Report | IR 05000333/2015001 Section 4OA2 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Burritt B Sienel E Burket E Knutson J Patel J Schoppy |
| Violation of: | Technical Specification - Procedures Technical Specification |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
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Finding - FitzPatrick - IR 05000333/2015001 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (FitzPatrick) @ 2015Q1
Self-Identified List (FitzPatrick)
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