ENS 41798: Difference between revisions
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| event date = 06/26/2005 04:17 PDT | | event date = 06/26/2005 04:17 PDT | ||
| last update date = 08/23/2005 | | last update date = 08/23/2005 | ||
| title = Edg Inoperable Due | | title = Edg Inoperable Due to Loose Electrical Connection | ||
| event text = On June 25, 2005, at about 1335 PDT, during a test of Unit 3 Emergency Diesel Generator (EDG) 3G003, Emergency Supply Fan 3A276 did not start. SCE's investigation found a loose electrical connection at the thermal overload auxiliary switch contact for that fan. A similar condition was found on Emergency Supply Fan 3A277. SCE declared 3G003 inoperable and initiated a common cause investigation required by the EDG Technical Specifications. SCE tightened the affected electrical connections and after successfully start testing 3G003, declared 3G003 operable at 0406 PDT on June 26, 2005. | | event text = On June 25, 2005, at about 1335 PDT, during a test of Unit 3 Emergency Diesel Generator (EDG) 3G003, Emergency Supply Fan 3A276 did not start. SCE's investigation found a loose electrical connection at the thermal overload auxiliary switch contact for that fan. A similar condition was found on Emergency Supply Fan 3A277. SCE declared 3G003 inoperable and initiated a common cause investigation required by the EDG Technical Specifications. SCE tightened the affected electrical connections and after successfully start testing 3G003, declared 3G003 operable at 0406 PDT on June 26, 2005. | ||
On June 26, 2005, at about 0417 PDT, SCE found similar loose connections for EDG 3G002. Components affected were the EDG radiator fan and an EDG Emergency Supply Fan. Because SCE could not conclusively determine if the loose connections would have caused 3G002 to be inoperable, SCE conservatively declared 3G002 inoperable. (SCE currently plans to start test the Unit 2 EDGs today to confirm the Unit 2 EDGs remain operable.) | On June 26, 2005, at about 0417 PDT, SCE found similar loose connections for EDG 3G002. Components affected were the EDG radiator fan and an EDG Emergency Supply Fan. Because SCE could not conclusively determine if the loose connections would have caused 3G002 to be inoperable, SCE conservatively declared 3G002 inoperable. (SCE currently plans to start test the Unit 2 EDGs today to confirm the Unit 2 EDGs remain operable.) |
Latest revision as of 22:20, 1 March 2018
Where | |
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San Onofre California (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+3.58 h0.149 days <br />0.0213 weeks <br />0.0049 months <br />) | |
Opened: | Clay Williams 14:52 Jun 26, 2005 |
NRC Officer: | Bill Gott |
Last Updated: | Aug 23, 2005 |
41798 - NRC Website
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