05000458/FIN-2011003-03
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Finding | |
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Title | Licensee-Identified Violation |
Description | In Section 40A3, Licensee Event Report 05000458/2011-002-00, Operations Prohibited by Technical Specifications Due to Instrument Isolation Valve Mispositioning, discusses a violation of Technical Specifications 3.3.1.1, Reactor Protection System (RPS) Instrumentation, and 3.3.4.1, End of Cycle Recirculation Pump Trip (EOC-RPT) Instrumentation. These technical specification sections required reactor protection system channel D functions for turbine control valve and turbine stop valve fast closure, and end of cycle recirculation pump trip function for turbine stop valve number 2 closure initiation be operable prior to exceeding 40 percent reactor thermal power. Contrary to that, on February 13, 2011, the operating shift crew did not recognize that reactor protection system channel D functions for turbine control valve and turbine stop valve fast closure, and end of cycle recirculation pump trip function for turbine stop valve number 2 closure initiation were disabled while the reactor exceeded 40 percent power. Using Inspection Manual Chapter 0609, Significance Determination Process, Phase 1 Worksheet, the finding was determined to be of very low safety significance (Green), because it was not a design or qualification deficiency; did not represent either a loss of system safety function, an actual loss of safety function of a single train, or an actual loss of safety function; and did not screen as potentially risk-significant due to a seismic, flooding, or severe weather initiating event. |
Site: | River Bend |
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Report | IR 05000458/2011003 Section 4OA7 |
Date counted | Jun 30, 2011 (2011Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | B Latta P Elkmann A Barrett G Larkin V Gaddy |
INPO aspect | |
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Finding - River Bend - IR 05000458/2011003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2011Q2
Self-Identified List (River Bend)
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