05000275/FIN-2014004-05
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Finding | |
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| Title | Notice of Enforcement Discretion 14-4-001 for a Loss of Both Required Offsite Power Circuits |
| Description | On August 10, 2014, at 6:56 a.m., emergency diesel generator 2-2 was removed from service for a planned maintenance outage. During the maintenance, a diesel fuel oil inlet to fuel header capscrew was discovered broken. An extent of condition review was performed and a similar capscrew was discovered to have an ultrasonic test indication on diesel generator 2-3. Diesel generator 2-3 was declared inoperable August 14, 2014, at 4:31 p.m., and DCPP Unit 2 entered Technical Specification 3.8.1, Condition E, Required Action E.1, to ensure at least two diesel generators were operable. The capscrew on diesel generator 2-3 was replaced, but during preparations to return the diesel generator to service, a separate, non-related failure of the engine driven fuel oil booster pump shaft seal occurred. As required by Technical Specification 3.8.1, Condition H, Action H.1, operators shut the unit down and placed the unit in Mode 3, Hot Standby. Technical Specification 3.8.1, Condition H, Required Action H.2 also required the unit to be in Mode 5 in 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Enforcement discretion was requested by the licensee to permit additional time to make repairs and restore diesel generator 2-3 to operable status before entry into Mode 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />, as required. An additional 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> was requested to restore diesel generator 2-3 such that the completion time of Required Action H.2 would expire at 9:31 a.m. on August 16, 2014. A notice of enforcement discretion (NOED) was granted by the NRC staff at 2:45 p.m. on August 14, 2014. The condition causing the need for this NOED was corrected by the licensee with the restoration of diesel generator 2-3 to operable status, allowing the licensee Unit 2 to exit Technical Specification 3.8.1, Required Action H.2, and the NOED on August 14, 2014, at 6:00 p.m. On August 15, 2014, emergency diesel generator 2-2 was restored to operable status at 2:21 p.m. on August 17, 2014. Consistent with NRC policy, the NRC agreed not to enforce compliance with the specific technical specifications in this instance, but will further review the cause(s) that created the apparent need for enforcement discretion to determine if there is a performance deficiency, if the issue is more than minor, or if there is a violation of requirements. This issue will be tracked as an unresolved item (URI)05000275/2014004-05; Notice of Enforcement Discretion 14-4-001 for a Loss of Both Required Offsite Power Circuits. |
| Site: | Diablo Canyon  |
|---|---|
| Report | IR 05000275/2014004 Section 4OA3 |
| Date counted | Sep 30, 2014 (2014Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | C Alldredge C Osterholtz J Mateychick J O'Donnell J Reynoso L Carson L Micewski L Ricketson M Bloodgood N Greene T Hipschman W Walkerj Reynosom Hayes M Kennard R Alexander T Buchanan T Hipschman |
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Finding - Diablo Canyon - IR 05000275/2014004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2014Q3
Self-Identified List (Diablo Canyon)
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