05000313/FIN-2008003-04
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Finding | |
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| Title | LOW Pressure Safety Injection Check Valve Failure Due to Inadequate Maintenance Procedures |
| Description | The inspectors documented a self-revealing noncited violation of Technical Specification 6.4.1.a, Procedures, for an inadequate Unit 2 low pressure safety injection discharge check valve assembly procedure. Specifically, during Refueling Outage 2R18 (Fall 2006) the Train A pump discharge check valve was incorrectly assembled such that it would not fully close. Subsequently, during Refueling Outage 2R19 (Spring 2008), operations swapped decay heat removal from Train A to Train B and noticed reverse flow through the Train A pump, indicating that the discharge check valve was not fully closed. The licensee determined that the safety function of the valve was maintained because the valve still limited sufficient reverse flow through the Train A pump such that Train B pump remained operable. Operability of the Train A pump was not affected. A contributor to the violation included inadequate postmaintenance testing following refueling outage 2R18 work. The licensee entered the issue into the corrective action program as CR ANO-2- 2008-0422 and implemented compensatory measures as appropriate. The licensee performed corrective maintenance, successfully completed post maintenance testing, and returned the system to service. The finding was more than minor because it was similar to nonminor Example 5.b in NRC Manual Chapter 0612, Appendix E, Examples of Minor Issues, in that the valve was installed incorrectly during Unit 2 Refueling Outage 2R18 and then the system was subsequently returned to service with the faulty component. The finding was of very low safety significance because the Train B LPSI pump remained operable. The inspectors determined that this particular finding did not have a cross-cutting aspect because the inadequate procedure was in place for eight years, which is not indicative of current plant performanc |
| Site: | Arkansas Nuclear  |
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| Report | IR 05000313/2008003 Section 1R20 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | L Ricketson P Elkmann G George S Graves A Sanchez W Walker W Sifre J Josey S Alferink C Young G Apger S Makor B Rice |
| INPO aspect | |
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Finding - Arkansas Nuclear - IR 05000313/2008003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2008Q2
Self-Identified List (Arkansas Nuclear)
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