05000361/FIN-2011002-01
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Finding | |
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| Title | Failure to Follow Station Procedures for Seasonal Readiness |
| Description | The inspectors identified a finding for the failure of license personnel to follow procedure SO23-XX-29.1, Seasonal Readiness. Specifically, licensee personnel failed to implement, as seasonal weather conditions dictated, the appropriate preventative maintenance program for roof drains associated with the emergency diesel generator buildings. As a result of the recurring degraded and clogged roof drains, rainwater was allowed to accumulate on the roof which resulted in water intrusion into the Unit 2 building and over energized electrical equipment. A plastic tent was installed by maintenance personnel to protect the electrical equipment. Based on the inspectors concerns, licensee personnel completed a walk down of the other emergency diesel building to identify whether similar rainwater intrusion was occurring. Maintenance personnel corrected the condition by removing debris which had clogged the Unit 2 roof drains. This issue was entered into the licensees corrective action program as Nuclear Notifications NN 201393414 and NN 201174566. The performance deficiency was more than minor and is therefore a finding because it was associated with the protection against external events attribute of the Mitigating Systems cornerstone and affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Using the NRC Manual Chapter 0609, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to have very low safety significance because it did not represent a loss of system safety function, nor actual loss of safety function of a single train, and it did not screen as potentially risk significant due to flooding or severe weather because the potentially degraded equipment was not specifically designed to mitigate flooding or severe weather nor would it contribute to external event initiated accident sequences. The finding was determined to have a crosscutting aspect in the area of human performance associated with the component of work control because the licensee did not plan and coordinate work activities consistent with nuclear safety. Specifically, the licensee did not plan or implement preventative maintenance for roof drains to support long-term equipment reliability by limiting reliance on manual actions, such as plastic tents to protect plant equipment during the rain events. Maintenance scheduling was more reactive than preventative H.3(b)( |
| Site: | San Onofre  |
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| Report | IR 05000361/2011002 Section 1R01 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.01 |
| Inspectors (proximate) | M Young R Kellar G Tutak B Hagar Z Hollcraft P Elkman G Guerra R Lantz S Garchow J Reynoso G Warnick C Osterholtz |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - San Onofre - IR 05000361/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2011Q1
Self-Identified List (San Onofre)
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