ML20037C845
| ML20037C845 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 02/23/1981 |
| From: | Werling J DUQUESNE LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| BVPS:JAW:1111, RO-81-014-01P-0, RO-81-14-1P, NUDOCS 8103020385 | |
| Download: ML20037C845 (3) | |
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DUQUESNE LIGRT COMPANT
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,'T; in Beaver Valley Power Station Post Office Box 4 I
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Februa ry 23, 1981 BvFS JAWc1111 i
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.E Beaver Valley Power Station, Unit No.1
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Ikicket No. 50-334, Licence No. DPR-66 LER 81-014/017
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Mr. 3.' E.~ Crier,- Director of-Regulation..
I United' States Nuclear Regulatory Commission
- Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406 '
Dear Mr. Criers In accordance with Appendix A, Beaver Valley Technical Specifications -'"
=-Licensee : Event Report LER' 81-014/01F,' Technical-Specification"6.9 4148.c.
Pressure Boundry.Wald Crack,. is submitted., This occurrence was reported tom l
the Beaver Valley JULC Resident inspector Hr..J. D. Hegner at 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> andi on-the Motirne phone at -1206 hours on February 22, 19810-
, M- ~ At 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> on Saturday, February 21, 1981, while taaking preparations w far plant startup, instrument technicians reported - a leak at a reactor coolant,
cystem (RCS) valve.
The reactor coolant system pressure was 2235 psig and -
tcaperature viss 547* F.
'Ihe leak was' traced to the v.icinity of RC-11, which -
10 the root stop for PT-RC-403 (RCS wide range pressure transmitter] and MrW-RH-700 (Resf dual Heat Removal System inlet.) ' At this point it was felt that. it was a body to bonnet leak on one of:these two valves, but couldn't~.
bi confirmed due to the altror insulation surrounding the piping and valves. -
Plans were started tu provide a method of sealing the valve. On the cfternoon shif t the RCS leakage inventory was calculated to be less than 0.5 spm.
RC5 laskage was calculated on the midnight shift on February 22,1981 to be 2,7 gpa. At 0100 huura on February 22, 1981, a cooldown to mode S was commenced due to the increased leakage. While the cooldown.was in progress the mirror W
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taeulation was being removed for a complete view of the leak.
At 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> the leak rate *was up to ICgps. At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> on February 22, 1981 workmen entered the containment building and were able to identify positively a weld i
leek, there the AC-11 mipple penetrates the RCs boundry.
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w Doguesne Light Company Engineering Department to determine an action plan to l
be followe(. The plant. is in moJe 5 and.is being drained to mid span in the
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RCS logps to allow the cracked weld.to be repaired.
A complete fo11ovup report'will be submitted'and the resident inspector will be kept up to date -
on the progress of the job,'
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Very truly yours,
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United States Muelear Regulatory Constission Washington, D, C.
20555 D, A.' Chaney, BVPS Licensing Project Hansge'r United States Muclear Regulatory Commission,_.
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.a D.7 A. Seeksenf. Nuclear Regulatory Cossaission,. BVPS Sita. Inspector :=.
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Nuclear Safety' Analysis Center, Palo Alto.- Californiar
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M.v.- John Alford,- FA Public Utilities Cossaission, NscrisburgIPA-
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