05000461/FIN-2010006-02
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Finding | |
|---|---|
| Title | Inadequate Test Control of RHR Heat Exchangers |
| Description | The inspectors identified an NCV of 10 CFR Part 50, Appendix B, Criterion XI, Test Control, having very low safety significance for the licensees failure to establish test conditions to assure that the 1B residual heat removal heat exchanger would perform satisfactorily in service under accident conditions. Specifically, the inspectors determined that the heat exchanger thermal performance test procedure did not assure adequate temperature differences to provide reliable test results. In addition, the most recent test was performed with lower temperature differences than those identified in plant calculations. This finding was entered into the licensees corrective action program and a preliminary analysis performed by the licensee concluded the test results were acceptable
The finding was more than minor because it was associated with the design control attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the residual heat removal heat exchanger performance test procedure did not establish appropriate test conditions to ensure that the component would perform its required function during an accident. Also, the inspectors determined that the finding was similar to Examples 3.j and 3.k of IMC 612, Appendix E, in that there was a reasonable doubt of the operability of the component based on the most recent test conditions. The inspectors determined the finding was of very low safety significance (Green) because it was not a design or qualification deficiency, did not represent a loss of system safety function, and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. This finding did not have a cross-cutting aspect because it did not represent current performance. |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2010006 Section 1R21 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Dunlop C Baron N Greca J Gilliam A Stone C Edwards T Hartman |
| INPO aspect | |
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Finding - Clinton - IR 05000461/2010006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2010Q2
Self-Identified List (Clinton)
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