05000250/FIN-2010004-04
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Technical Specification 3.8.1.1.b requires restoration of an inoperable diesel generator to operable status within 14 days or be in at least hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. Contrary to the above, from April 27 through May 10, 2010, the unit 4A emergency diesel generator was inoperable approximately 16.9 days because of speed sensing magnetic pickup damage due to it being set too close to the engine flywheel during maintenance. When identified by the licensee during a surveillance test, the licensee entered the issue in the corrective action program as AR 406620406620and corrected the condition. Additional corrective actions were implemented under the AR. A regional Senior Reactor Analyst performed a Phase III evaluation under the Significance Determination Process. The dominant internal events accident sequence was a single unit loss of offsite power followed by the common cause failure of all the emergency diesel generators with a failure to recover offsite power or an emergency diesel generator before core damage two hours later. Assumptions of the evaluation included that common cause would be considered and, recovery of the failed diesel generator would not be considered. The exposure time for the evaluation was 16.9 days. Based upon this evaluation the performance deficiency was characterized as a finding of very low safety significance. |
| Site: | Turkey Point  |
|---|---|
| Report | IR 05000250/2010004 Section 4OA7 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Fletcher R Chou R Carrion W Rogers M Barillas S Stewart D Rich |
| INPO aspect | |
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Finding - Turkey Point - IR 05000250/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Turkey Point) @ 2010Q3
Self-Identified List (Turkey Point)
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