05000361/FIN-2011010-05
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Finding | |
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| Title | Failure to Maintain Equipment Important to Safety |
| Description | The team identified a Green noncited violation of 10 CFR 50.65, Requirements for monitoring the effectiveness of maintenance at nuclear power plants, which states in part: Each holder of a license to operate a nuclear power plant shall monitor the performance or condition of structures, systems, or components, against licensee-established goals, in a manner sufficient to provide reasonable assurance that such structures, systems, and components, are capable of fulfilling their intended functions, and when the performance or condition of a system, structure, or component, does not meet established goals, appropriate corrective actions shall be taken. Specifically, as of July 22, 2011, the licensee failed to adequately monitor the condition of the Flood Level Detecting system in a manner to provide reasonable assurance the system could perform its intended function. The licensee failed to properly evaluate Maintenance Rule Functional Failures and take appropriate corrective actions to improve system performance. These level switches are connected to control room annunciation to warn the control room of flooding in a space that has safety-related or important to safety components. This has been entered into the licensees corrective action program as Nuclear Notifications NN-201567315 and NN-201570575. The team determined that the failure to properly maintain the flood level sensors which are used for control room annunciation to warn the control room of flooding of a space that has safety related or important to safety components, was a performance deficiency. The finding was more than minor because it was associated with the mitigating systems cornerstone attribute of design control, 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 licensee did not maintain flood level sensors appropriately to provide reasonable assurance that the components would be capable of fulfilling their intended function. In accordance with Inspection Manual Chapter 0609, Attachment 4, Phase 1 Initial Screening and Characterization of Findings, the team determined that the finding represented the degradation of equipment and functions specifically designed to provide notification to the control room of flooding of spaces with safety related or important to safety equipment and components. Therefore, the finding was potentially risk significant and a Phase 3 analysis was required. The preliminary significance determination was based on Inspection Manual Chapter 0609, Appendix M, Significance Determination Process Using Qualitative Criteria. The senior reactor analyst determined qualitatively that the risk was very low for the following reasons: (1) the frequency of internal flooding is very low, (2) floods in most of the problem areas would not cause a transient, (3) redundant indications of flooding exist, including fire and sump pump operations, and (4) none of the potentially flooded areas would likely affect more than one train of safety equipment. This finding involved a cross-cutting aspect in the area of Human Performance, Resources, because the licensee failed to assure that equipment and other resources were available and adequate to assure nuclear safety. Specifically, the licensee was not able to maintain the flood level switches adequately to assure nuclear safety due to long-standing equipment issues. |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2011010 Section 1R21 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | J Watkins R Kopriva S Pindale T Farnholtz W Sherbin S Kobylarz |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
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Finding - San Onofre - IR 05000361/2011010 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2011Q3
Self-Identified List (San Onofre)
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