ML20136B581
| ML20136B581 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 08/21/1979 |
| From: | Werling J DUQUESNE LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NVPS:JAH:707, NUDOCS 7909070345 | |
| Download: ML20136B581 (1) | |
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ririt office som 4 (f'47 Sk1 ringpore, FA 15077 F
Argest 21, 1979 NYFs:JAti:707 Semv=re Valley re >*r Staticm, Urtit Po.1 pocht Fa. 30-3}A. IAense Pe. D?R-66 LER 79-25/01r
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ner. D. 5. Crier, DLeecter of 8 p t.tims volted states Itueleer F-gulatory Car--'t**f ers Feglem 1 631 F.rrk Avenne Kf ar, of Frvsets, Pennsylvante 19406
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Dear ter. Crfer:
In acccrdsrce, vf th Tee,b stent spec t ricilf.cn 6. 9. I.R.b, the folltwing toefdent te s y rtad.
The report was.di=cutse4 wi th PTr.
D.
A. Facban et 12&O hours ce
- zust 70, 1979.
th-r*=r. tor was r.=minity tr ipped frc-apprtrximat ely.50% ra t ed At JLA4 benes, ywer fr,1)ovf r.w, the trip at the J M t'. min Teed ru p due to lev vet post tive =' vet f on The The J.A Condeosate Pirrp was shordown for c]eening of its strainer.
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JP M=fn Te.d Fuar had just been started and the 1A Fwer eeevred to inve-tJgate m
>Jgh bearing terperature en the JA Furp. -
f t', og initiatfe n of the reactar m.rlp, the aperatorm p rfart+4 th e.f ta-= d f a t e m oel set!<m, fot f av(ng a reaerer tr f p ac4 le** of verP=1 f**dvarer.
An esperator i
ehtafer th=t the generator corrut 1rrikers ware t= Lina een ic g to trfr, y ea.ity t ripred then prinr to th* paroa -t f e, t rip vhich nar r =11y cecury 30 seccade e.rt er the reactor /t ur bine trip.
Fince tb=.rvife generator v== ca 1 < - c.e r tJed to e be-ev+ -w. frequency dropped en the 1 A ord 15 m a eve, cr 4 11 thre-eractor The 3C mad 3D AW Cirses ca,t ear pr.rps s t irred en under f requency (1 of 3 bre e*).
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w.e 9 f ed f ora the systen and did not erp*:rier'cc th, esader f requency c c-4f t
- n f rty sreceds af ter the tvrbice t? tp, the 1A'and 314 Flu-e? t ran = f e r r,4 t o s y s t e==
pm er e-4 t e vinderfregorncy cendit scn eletted, retic minur'en efter the rescrer h
trip, t.he IC K *ctar Conlone re p ws wtarted and forced flow returned to the All Syse.e w crerated== deef sced and at no t 3 eve was the va cter ecolant syntes=.
b-mith and sarcty of the puMic jenperdiard.
Ccenettve. ertiever are eve =catly bef ag connidared by star ten canetes-ot.
Tbo 7-sults of this !cvestigatten will be provided in a follovup report.
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7" DUQUESNE LIGHT COMPANY Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 August 21, 1979 BVPS: JAW:707 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 LER 79-28/01P Mr. B. H. Grier, Director of Regulation United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. Grier:
In accordance with Technical Specification 6.9.1.8.b, the following incident is reported. The report was discussed with Mr. D. A. Beckman at 1240 hours0.0144 days <br />0.344 hours <br />0.00205 weeks <br />4.7182e-4 months <br /> on August 20, 1979.
At 1446 hours0.0167 days <br />0.402 hours <br />0.00239 weeks <br />5.50203e-4 months <br />, the reactor was manually tripped from approximately 50% rated power following the trip of the IB Main Feed Pump due to low net positive suction head. The 1A Condensate Pump was shutdown for cleaning of its strainer. The IB Main Feed Pump had just been started and the 1A Pump secured to investigate a high bearing temperature on the 1A Pump.
Upon initiation of the reactor trip, the operators performed the immediate manual actions following a reactor trip and loss of normal feedwater. An operator, thinking that the generator output breakers were-taking too long to trip, manually tripped them prior to the automatic trip which normally occurs 30 seconds after the reactor / turbine trip. Since the main generator was no longer tied to the system, frequency dropped on the 1A and 1B 4KV Buses and all three reactor coolant pumps tripped on underfrequency (2 of 3 buses). The IC and ID 4KV Buses were tied into the system and did not experience the underfrequency condition.
Thirty seconds after the turbine trip, the 1A and IB Buses transferred to system power and the underfrequency condition cleared.
Four minutes after the reactor trip, the 1C. Reactor Coolant Pump was started and forced flow returned to the reactor coolant system. All systems operated as designed and at no time was the health and safety of the public jeopardize ~d.
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Mr. B. H. Grist August 21, 1979 BVPS: JAW:707 Page 2
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Corrective actions are presently being considered by station management.
The results of this investigation will be provided in a followup repert.
Very truly yours, i
W D
J. A. Werling Superintendent cc: Director Of Management & Program Analysis /
United States Nuclear Regulatory Commission Washington, D. C.
20555 D. L. Wigginton, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, D. C.
20555 D. A. Beckman, Nuclear Regulatory Commission, King of Prussia, PA G. A. Olson, Secretary, Prime Movers Committee - EEI ef s
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