05000416/FIN-2008002-10
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | TS 3.3.1.1 for reactor protection system instrumentation, TS 3.3.2.1 control rod block instrumentation, and TS 3.3.4.1 end of cycle recirculation pump trip instrumentation requires that turbine bypass valves shall not be opened if reactor power is greater than 40 percent or while control rods are being withdrawn. Contrary to this requirement, while increasing reactor power from 65 percent, control room operators discovered that the turbine bypass Valves A and B were open while the plant was ascending in power by withdrawing control rods. The operating crew immediately stopped the withdrawal of control rods, thus exiting the plant from the conditions of TS 3.3.2.1. The operating crew reduced reactor power with core flow, automatically closing the bypass valves exiting the plant from the conditions of TSs 3.3.1.1 and 3.3.4.1. The reason the turbine bypass valves opened during power ascension was due to operators not setting the turbine generator load limiter to 1400 MWe following a feed pump trip earlier in the week. This error was made due to a nonspecific order, inadequate procedure guidance and incomplete turnover between operating crews. The plant performed an evaluation of the event and concluded that the protective functions credited during operations above 40 percent rated thermal power did not impact the protective functions of reactor protection system, control rod block, or end of cycle recirculation pump trip. This issue was documented in the licensees CAP program per CR-GGN-2008-01448. This issue was reviewed by regional management and determined to be of very low safety significance. |
| Site: | Grand Gulf  |
|---|---|
| Report | IR 05000416/2008002 Section 4OA7 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Deese P Elkmann R Smith A Barrett D Bollock |
| INPO aspect | |
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Finding - Grand Gulf - IR 05000416/2008002 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2008Q1
Self-Identified List (Grand Gulf)
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