05000458/FIN-2010003-02
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Finding | |
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| Title | Inadequate Procedure Results in Loss of Offsite Power to a 4160 Vac Safety Bus |
| Description | A self-revealing noncited violation of Technical Specification 5.4.1.a. was identified for inadequate procedural guidance when surveillance testing the Division III diesel generator. This resulted in a loss of offsite power to the Division III 4160 volt alternating current (Vac) bus while starting a nonsafety-related load with the Division III emergency diesel generator at full power paralleled to the grid. To prevent isolating offsite power to any safety bus, the licensee issued procedure changes to prevent starting loads on the nonsafety-related buses connected to the divisional safety buses while the emergency diesel generators are in test. The licensee entered this issue into their corrective action program as Condition Report CR-RBS-2010-00910
The finding was more than minor because it affected the equipment performance attribute of the Mitigating Systems Cornerstone and affected the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Using Inspection Manual Chapter 0609.04, Table 4a, the finding was determined to be of very low safety significance (Green) because the finding was not a design or qualification deficiency confirmed not to result in loss of operability or functionality, did not represent a loss of system safety function, did not represent actual loss of safety function of a single train for longer than its technical specification allowed outage time, did not represent an actual loss of safety function of one or more non-technical specification trains of equipment designated as risk significant, and did not screen as potentially risk significant due to seismic, flooding, or severe weather initiating event. There is no crosscutting aspect associated with this violation because this is a historical condition not previously identified by the licensee. |
| Site: | River Bend  |
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| Report | IR 05000458/2010003 Section 1R15 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | P Elkmann L Carson G Larkin V Gaddy A Fairbanks C Norton N Greene |
| INPO aspect | |
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Finding - River Bend - IR 05000458/2010003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2010Q2
Self-Identified List (River Bend)
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