05000361/FIN-2010002-06
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Finding | |
|---|---|
| Title | Failure to Perform an Adequate Postmaintenance Test |
| Description | A self-revealing Green noncited violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified for failure of maintenance planning personnel to develop and specify an adequate postmaintenance test in the work instructions used to perform maintenance on the backup nitrogen regulator for the component cooling water surge tank. Specifically, on October, 25, 2009, Maintenance Order MO 800335873 did not specify postmaintenance testing instructions that would verify that nitrogen supply valve PCV 5403 would perform satisfactorily in service, following calibration, and properly control surge tank pressure during changes in surge tank levels. This issue was entered into the licensees corrective action program as Nuclear Notifications NNs 200766430 and 200887764. The finding is greater than minor because it is associated with the procedure quality attribute of the Mitigating Systems Cornerstone and affects the associated cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Furthermore, the finding is similar to more than minor example 3.i in NRC Inspection Manual Chapter 0612, Appendix E, Examples of Minor Issues, in that, an extensive engineering evaluation was required to verify that the component cooling water system remained capable of performing its safety function during a design basis earthquake. Using the Manual Chapter 0609, Appendix G, Shutdown Operations Significance Determination Process, Phase 1 guidance, the finding is determined to have very low safety significance because the finding did not result in an increase in the likelihood of a loss of reactor coolant system inventory, degrade the ability to add reactor coolant system inventory, or degrade the ability to recover decay heat removal. This finding has a crosscutting aspect in the area of human performance associated with work practices because maintenance planning personnel failed to follow procedures to develop adequate work instructions to perform maintenance on safety-related equipmen |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2010002 Section 1R19 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | R Lantz P Elkmann D Allen J Reynoso J Josey G Warnick B Rice W Schaup |
| CCA | H.8, Procedure Adherence |
| INPO aspect | WP.4 |
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Finding - San Onofre - IR 05000361/2010002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2010Q1
Self-Identified List (San Onofre)
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