05000458/FIN-2009004-03
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Finding | |
|---|---|
| Title | Failure to Maintain Reactor Core Isolation Cooling System Seismic Design |
| Description | The inspectors identified a Green noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for failure to implement measures to ensure that the seismic design basis for the reactor core isolation cooling turbine governor hydraulic system was correctly translated into the specifications, drawings, procedures, or instructions. This resulted in work to reroute the piping and an engineering evaluation to resolve seismic concerns. The licensee entered this issue into their corrective action program as Condition Report CR-RBS-2009-3747. The failure to implement design control features for the seismic design of the reactor core isolation cooling system is a performance deficiency. This finding was more than minor because it is similar to Inspection Manual Chapter 0612, Appendix E, Examples of Minor Issues, Section 5, Example a, in that the reactor core isolation cooling turbine was returned to service without the seismic spacing required by the original design or completion of an evaluation for the as-left condition. This resulted in rework and additional engineering analysis to correctly resolve the seismic qualification concerns. The performance deficiency also affected the mitigating systems cornerstone attribute of external events and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events in order to prevent undesirable consequences. The inspectors evaluated the finding using Inspection Manual Chapter 0609, Attachment A, Phase 1 Initial Screening and Characterization of Findings, for the mitigating systems cornerstone. After answering no to all five questions in the mitigating systems cornerstone column of Table 4a, Characterization Worksheet for Initiating Events, Mitigating Systems, and Barrier Integrity Cornerstones, the inspectors concluded that the finding was of very low safety significance. This finding does not have a crosscutting aspect because the performance deficiency occurred in 1989 and is not reflective of current plant performance (Section 1R15) |
| Site: | River Bend  |
|---|---|
| Report | IR 05000458/2009004 Section 1R15 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | C Norton L Ricketson G Larkin V Gaddy |
| INPO aspect | |
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Finding - River Bend - IR 05000458/2009004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2009Q3
Self-Identified List (River Bend)
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