05000275/FIN-2013002-05
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | The licensee identified a violation of Technical Specification 3.8.1 because EDG 2-3 was inoperable for greater than 7 days. On August 18, 2012, an operator discovered that the fuel oil booster pump belt on EDG 2-3 was broken. The licensee subsequently determined that during the engine shutdown on August 3, 2012, the fuel oil booster pump had seized, which then caused the belt to snap. On August 20, 2012, the licensee completed replacement of the pump and drive belt. This violation has no associated performance deficiency because the licensee had set the drive belt tension in accordance with the manufacturers recommendation, and there was no internal or industry operating experience that indicated the drive belt tension level was inappropriate. In accordance with IMC 0609 Appendix A, Exhibit 2, Mitigating Systems Screening Questions, this violation required a detailed risk evaluation because it represented an actual loss of diesel generator function for greater than the Technical Specification allowed outage time. Using the Diablo Canyon Units 1 and 2 Standardized Plant Analysis Risk model, Version 8.20, modified to account for offsite power recovery and the licensees procedures for intertrain crosstie, the senior reactor analyst determined that the incremental conditional core damage probability from internal initiators was 1.9 x 10-7. As best available information, the analyst utilized the results from the licensees fire and seismic models as the external initiators contributor. The final change in core damage frequency was calculated to be 6.5 x 10-7. Therefore, this violation was of very low safety significance (Green). The licensee entered the issue into the corrective action program as Notification 50507816. Corrective actions include lowering the drive belt tension specification to minimize side deflection force and modifying the procedure for placing a diesel generator to standby to specifically include a visual check of fuel oil booster pump drive belt integrity. |
| Site: | Diablo Canyon  |
|---|---|
| Report | IR 05000275/2013002 Section 4OA7 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | L Ricketson N O'Keefe T Hipschman J Laughlin I Anchondo P Jayroe L Micewski D You |
| Violation of: | Technical Specification - Procedures Technical Specification |
| INPO aspect | |
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Finding - Diablo Canyon - IR 05000275/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2013Q1
Self-Identified List (Diablo Canyon)
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