ML20210K040
| ML20210K040 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/30/1997 |
| From: | Heysek W GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML20210K027 | List: |
| References | |
| NUDOCS 9708190122 | |
| Download: ML20210K040 (1) | |
Text
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APPENDIX B UNIT SHUIT) OWNS DOCKET NO. 50-289 DATE August 14, 1997 COMPLETED BY W. HEYSEK TELEPHONE (717)948-8191 REPORTING PERIOD: JUNE 1997 we.u c r a c--ee Due Tvpe' Dtruene Ramon' p,,,,,,,
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,_ e 97.o3 06/21/97 F
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On 6/2I/97 at 1214 hours0.0141 days <br />0.337 hours <br />0.00201 weeks <br />4.61927e-4 months <br />, the plant tripped on a less Of OfIsite Ibwa (LOOP). It had been operstmg at 100%
pown. The plant tnp was caused by the canA failure of generator brealer GB-1-02 in the plant 230KV 181.8 switch-yard. A fault in the"B' phase of the brealer caused severe overheating and eyectwn of the bushmg and conductor from the breaker The fault was detected on the #4 bus (230KV) which resulted in the openmg of the parallel breaker which suffered a re-stnic and caused a fatJt on the alternate #8 tms. Ihe two faults resulted in breaker action which iso'ated power to the station and resulted in the LOOP. The LOOP resulted in immediate reactor and turbme trips. Both crwuKy diesel ger rators started and loaded on to their respective safegunds buses as designed. Without balance of plant power, the condensate, feed, circulaimg water and main condenser vacuum pumps were not operable. The once through steam generators were fed tivuugh the Emergency Feedwater System via two electric pumps pourred by the ep m og safeguards busses and a steam dnven pump. Heat was removed via the steam generator atmovheric dump valves. Loss of station poma also deenergized the reactor coolant pumps which forced the plant into a neural circulation mode. Natural circulation Gow was achieved within 19 minutes of the tnp. OtTsite power was restored withm 90 mmutes. Sptems une restored to enable coolmg sta the mam condenser and subsequent restart of the reactor coolant pumps The failed breakers uere replaced with new ABB model 242 PMG 30tX) amp breakers. The plant was back on hne at 0202 on June 29,1997.
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SUMMARY
- The plant entered the month operating at 100% power and remained at that power level until the plant trip at 1214 on June 21 described above. The plant returned to power operation at 0202 on June 29,1997. The plant is scheduled to shutdown on September 5,1997 for refueling.
2 9708190122 970814 PDR ADOCK 05000289 R
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