Finding | |
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| Title | |
| Description | An apparent violation (AV) of 10 CFR 50, Appendix B, Criterion III, Design Control, having a preliminary low to moderate safety significance (White), was identified in January 2006 following the discovery that two of the Unit 1 electromatic relief valves (ERVs) would not have performed their safety function. Increased vibrations experienced while operating at extended power uprate (EPU) power levels resulted in the degradation of multiple ERV actuator components which rendered the valves inoperable. The inspectors determined that the licensee implemented the Unit 1 EPU in November 2002, but failed to verify that the ERV actuator design was suitable for operation at the increased vibration levels experienced at EPU power levels. Organizational weaknesses at the station and corporate levels contributed to the licensees failure to identify this issue prior to, or immediately following, EPU implementation. The finding was determined to be more than minor because it impacted the Mitigating Systems cornerstone. In addition, the attributes of design control and equipment performance were adversely impacted by the failure of the ERV actuators. The finding was preliminarily determined to be of low to moderate safety significance following the performance of a case-specific Phase 3 SDP evaluation. The inspectors determined that this finding also affected the cross-cutting area of problem identification and resolution because the licensee failed to fully evaluate historical and predictive information regarding higher than expected main steam line vibrations. Corrective actions included replacing the Unit 1 ERV actuators in January 2006, installing new ERV actuators designed to withstand the increased vibrations experienced during EPU operations in May 2006, and installing an additional modification to reduce the overall main steam line vibration levels. Additional corrective actions were in progress to address the organizational aspects that contributed to this issue. (Section 4OA2) |
| Site: | Quad Cities  |
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| Report | IR 05000254/2006014 Section 4OA2 |
| Date counted | Jun 30, 2006 (2006Q2) |
| Type: | Violation: White |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | J Jacobsonb Bersong Grant K O'Brien M Satorius P Pelke S West |
| INPO aspect | |
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Finding - Quad Cities - IR 05000254/2006014 | |||||||||
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Finding List (Quad Cities) @ 2006Q2
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