05000220/FIN-2013002-02
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Finding | |
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| Title | Test Conditions Not Properly Established |
| Description | A self-revealing finding (FIN) was identified for the failure of Constellation Energy Nuclear Group, LLC (Constellation), maintenance personnel to ensure appropriate conditions were established during a surveillance test to confirm the lockup valves for flow control valve (FCV)-29-137 were properly functioning at Unit 1. As a result, a failure associated with the lockup valves was not detected during surveillance testing activities conducted in March 2011. This undetected failure led to an unexpected injection of water into the reactor pressure vessel (RPV) on November 6, 2012, during an unplanned outage, resulting in an increase in RPV water level, turbine trip signal, and initiation of the highpressure coolant injection (HPCI) logic. Constellation entered this issue into their corrective action program (CAP) as condition report (CR)-2012-010141. This finding is more than minor because it is associated with the human performance attribute of the Initiating Events cornerstone and affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, because maintenance personnel did not properly implement procedure N1-IPM-029-010, Calibration of Feedwater FCV-29-134, FCV-29-137, and FCV-29-14, Revision 00603, the lockup valves for FCV-29- 137 were not adequately tested, and as a result, degraded valve performance was not detected during a March 2011 surveillance test. Consequently, on November 6, 2012, FCV- 29-137 unexpectedly failed partially open when instrument air was removed from the valve which caused a subsequent increase in RPV level, creation of a turbine trip signal, and initiation of the HPCI injection logic. In accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibit 1 of IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, issued June 19, 2012, the inspectors determined that this finding is of very low safety significance (Green) because the performance deficiency 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. This finding has a cross-cutting aspect in the area of Human Performance, Work Practices, because Constellation maintenance personnel did not effectively use human error prevention techniques such as peer and self checking to ensure plant conditions and system status were adequate to perform an air drop test on the lockup valves for FCV-29-137. Specifically, Constellation personnel failed to ensure the actuating cylinder for FCV-29-137 was pressurized prior to commencing the test. As a result, the air drop test was not properly conducted, and the degraded condition of the lockup valves was not identified, |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2013002 Section 1R22 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | D Schroeder K Kolaczyk B Haagensen J Laughlin T Ziev B Dionne E Miller |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Nine Mile Point - IR 05000220/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Nine Mile Point) @ 2013Q1
Self-Identified List (Nine Mile Point)
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