05000261/FIN-2010011-07
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Finding | |
|---|---|
| Title | Failure to Implement Adequate Post Maintenance Test of Residual Heat Removal Valve Interlock Function |
| Description | The team identified a finding having very low safety significance (Green) involving the failure to perform a post maintenance test to verify functionality of valve position permissive interlocks associated with the reactor coolant system (RCS) hot leg loop isolation valves. The licensee performed a visual inspection to verify that the associated contacts for the valve position permissive interlock function were in their expected open position, and is tracking further actions in the corrective action program under NCR 422032. The failure to perform a post maintenance test to verify functionality of the permissive interlock associated with the RCS hot leg loop isolation valves following replacement of relays which affected that function was a performance deficiency. The finding was more than minor because it adversely affected the RCS and barrier performance attribute of the barrier integrity cornerstone objective to provide reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. Specifically, the failure to verify functionality of the permissive interlocks for the RCS hot leg loop isolation valves following intrusive maintenance, challenged the assurance that the interlocks design function would be available to prevent opening of the RCS hot leg isolation valves with a flow path established to the RWST and; therefore, prevent a loss of RCS water inventory to the RWST. The finding was determined to be of very low safety significance because the finding would not have likely affected other mitigation systems resulting in a total loss of their safety function. Further, this finding did not constitute a violation of NRC requirements since the interlock function and associated components the licensee failed to test were not safety-related. The finding is assigned a crosscutting aspect in the resources component of the human performance area in that complete, accurate, and up-to-date work packages were not provided H.2(c). |
| Site: | Robinson  |
|---|---|
| Report | IR 05000261/2010011 Section 1R21 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | Finding: Green |
| cornerstone | Initiating Events, Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | S Walker G Skinner M Yeminy S Sandal B Desai J Eargle P Braxton |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Robinson - IR 05000261/2010011 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Robinson) @ 2010Q4
Self-Identified List (Robinson)
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