05000324/FIN-2017004-01
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Finding | |
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| Title | Loss of Emergency 4160V Bus Due to Failure to Implement Procedure |
| Description | A self-revealing non-cited violation (NCV) was identified for the licensees failure to properly transfer power to the E-4 4160 volt emergency bus from the E-4 emergency diesel generator (EDG), to the normal switchgear bus 2C, as required by procedure 0OP-50.1 Diesel Generator Emergency Power System Operating Procedure. This resulted in a momentary under voltage condition followed by a re-energization of the E-4 emergency bus by EDG-4. This was entered into the licensees corrective action program (CAP) as nuclear condition report (NCR) 2151329.The licensees failure to parallel across (i.e., reclose) the normal feeder breakers prior to unloading the EDG-4 and opening the EDG-4 output breaker, which resulted in a valid and automatic actuation of the EDG-4, was a performance deficiency. The finding was determined to be greater than minor because it was associated with the human 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 power operations. Using IMC 0609.04, Initial Characterization of Findings, Exhibit 1, the issue was classified as a transient initiator contributor because it was associated with a loss of offsite power (LOOP). Finally, using Appendix A of IMC 0609, SDP for Findings at-Power, the finding was determined to be of very low safety significance (Green) because it did not contribute to both the likelihood of a reactor trip and the likelihood that mitigating systems would not be available. Using Manual Chapter 0310, Aspects Within the Cross-Cutting Areas, the inspectors identified a cross-cutting aspect in the procedural adherence of the human performance area, because the operators failed to properly utilize an existing procedure pertinent to their particular situation and this directly resulted in the momentary loss of an emergency 4160 volt bus. [H.8] |
| Site: | Brunswick  |
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| Report | IR 05000324/2017004 Section 4OA3 |
| Date counted | Dec 31, 2017 (2017Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | G Smith J Stewart M Schwieg M Bates S Rose |
| CCA | H.8, Procedure Adherence |
| INPO aspect | WP.4 |
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Finding - Brunswick - IR 05000324/2017004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Brunswick) @ 2017Q4
Self-Identified List (Brunswick)
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