05000280/FIN-2009005-05
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Finding | |
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Title | Licensee-Identified Violation |
Description | Technical Specification 6.4 requires, in part, that detailed written procedures with appropriate check-off lists and instructions be provided and followed for maintenance which could have an effect on the safety of the reactor. Contrary to the above, procedures for maintenance of the ESW pumps did not contain appropriate instructions to assure water tight integrity of the ESW pump house was maintained, and three unsealed penetrations in the emergency service water building floor were identified by the licensee on September 24, 2009. This was identified in the licensees CAP as condition report 349378. A regional Senior Reactor Analyst performed a Phase 3 evaluation under the Significance Determination Process and concluded that the finding was of very low safety significance (Green). The dominant accident sequence involved a postulated tornado-induced non-recoverable Loss of Offsite Power that failed all the Emergency Service Water Pumps, due to the performance deficiency. The accident sequence included numerous combinations of motor operated valves in the Service/Circulating Water System failing which drained the intake canal without the ability to makeup the lost inventory. The Auxiliary Feedwater System would have provided secondary side heat removal. However, without the Service Water System, cooling to the Reactor Coolant Pump seals would not have been maintained and a Seal Loss of Coolant Accident would have occurred, leading to core damage. The exposure period evaluated was one year, and no recovery of the Emergency Service Water Pumps was considered. |
Site: | Surry ![]() |
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Report | IR 05000280/2009005 Section 4OA7 |
Date counted | Dec 31, 2009 (2009Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | C Fletcher R Williams R Hamilton W Loo J Nadel A Vargas-Mendez C Welch G Mccoy |
INPO aspect | |
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Finding - Surry - IR 05000280/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Surry) @ 2009Q4
Self-Identified List (Surry)
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