05000282/FIN-2014004-02
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Finding | |
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| Title | Failure to have Adequate Procedures to Address Low Bus Voltage Conditions |
| Description | A self-revealing finding and a NCV of Technical Specification 5.4.1 was identified on June 23, 2014, due to the failure to establish, implement and maintain the applicable procedures to address degraded power sources as recommended in Section 6 of Regulatory Guide 1.33, Revision 2, Appendix A, Revision 2. Specifically, Procedure 1C20.5, Unit 14.16kV [kilovolt] System, failed to provide adequate guidance to address a degraded power condition on the 10 Bank Transformer, the 1R Transformer and Bus 15 (one of two safety-related 4.16 kV buses). This resulted in these components experiencing a low voltage condition for an extended period of time, Bus 15 voltage cycling near the degraded voltage actuation setpoint, and the automatic start of the D1 EDG. Corrective actions for this issue included repairing the equipment that led to the degraded voltage condition and revising Procedure 1C20.5 or developing a new procedure to provide guidance on responding to degraded voltage conditions. This issue was more than minor because it impacted the procedure quality attribute of the Mitigating Systems cornerstone. In addition, the performance deficiency impacted the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the lack of procedural guidance resulted in delaying operator action to restore voltage to Bus 15. The inspectors utilized IMC 0609, Significance Determination Process, Attachment 0609.04, Initial Characterization of Findings, and determined that this issue was of very low safety significance because each question provided in IMC 0609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions, was answered No. The inspectors concluded that this finding was cross-cutting in the Human Performance, Resources area because the licensee had not ensured that procedures were available and adequate to support nuclear safety (H.1). |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2014004 Section 4OA3 |
| Date counted | Sep 30, 2014 (2014Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | P Laflamme P Voss P Zurawski R Elliott B Bostn K Riemer K Stoedter M Phalen N Feliz Adorno |
| Violation of: | Technical Specification - Procedures Technical Specification |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
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Finding - Prairie Island - IR 05000282/2014004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2014Q3
Self-Identified List (Prairie Island)
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