05000220/FIN-2009002-01
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Finding | |
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| Title | Inadequate Maintenance Instructions Result in Residual Heat Removal System Voiding |
| Description | A self-revealing non-cited violation (NCV) of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified when inadequate instructions for maintenance that had previously been performed on the Unit 2 residual heat removal (RHR) system were found to have allowed the accumulation of voids in the \'C\' RHR pump suction line, the combined volume of which could have potentially affected the operability of the pump. As immediate corrective action, the \'C\' RHR pump suction line was filled and vented. After the void volume had been sufficiently reduced to allow pump operation, the \'C\' RHR pump quarterly surveillance was performed to sweep out the remaining voids. This issue was entered into the corrective action program (CAP) as condition report (CR) 2009-457.The finding was more than minor because it was similar to example 3.k in Appendix E of Inspection Manual Chapter (IMC) 0612, in that there was a reasonable doubt on the operability of the \'C\' RHR system because the as-found condition exceeded the industry standard limit for operability. The finding was associated with the procedure quality attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding was evaluated in accordance with IMC 0609, Attachment 4, and determined to be of very low safety significance because the finding was not a design or qualification deficiency, did not represent a loss of a system/train safety function, and did not screen as potentially risk significant due to external events. This finding had a crosscutting aspect in the area of problem identification and resolution because the susceptibility of the RHR pump discharge lines to voiding was identified in 1999 and reflected in plant procedures, but this internal operating experience was not incorporated into the 2008 maintenance procedure (P.2.b per IMC 0305) |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2009002 Section 1R13 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | M Marshfield D Dempsey B Haagensen J Furia G Dentel E Knutson S Shaffer N Perry J Hawkins |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Nine Mile Point - IR 05000220/2009002 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Nine Mile Point) @ 2009Q1
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