ML19250B889
| ML19250B889 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/17/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Dunn C DUQUESNE LIGHT CO. |
| Shared Package | |
| ML19250B890 | List: |
| References | |
| TAC-6505, NUDOCS 7911060004 | |
| Download: ML19250B889 (3) | |
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Cctober 17, 1979 Occket No. 50-334 Mr. C. N. Dunn, Vice President Operations Division Cuquesne Light Company 225 Sixth Aver.ue Pittsburgh, Pennsylvania 15219 L-:r Mr. Dunn:
Ca February 17, 1977, we provided you our analysis of the feedwater flow instability which occurred at the Beaver Valley Power Station (SVPS)
Unit No.1 on November 5, December 27, 1976 and January 5,1977. In our analysis, enclosed with the February 17, 1977 letter, we concluded that reasonable measures were being taken to minimize further dynamic instabilities in the main feedwater piping systems and that -he startup and power operation of the BVPS Unit No. I could continue.
7he long term operation of the SVPS Unit No. I was to be addressed based on the results of the instrumented test program review and evaluaticn by the Nuclear Regulatory Commission (NRC) staff and the results of the non-destructive examination of the highest stressed welds. We have completed our review of the vibration monitoring testing program and the ncn-destructive examinations of the welds.
Our safety evaluation of the monitoring program is encicsed. The non-destructive examination results were reviewed by the Office of Inspection and Enforcement inspector. These examinations included radiography of the welds inside and outside containment and comparison to the radio-graphs taken during construction. There was no detectable change in the weld radiograpns. The welds outside containment were also oye penetrant tested. One minor indication found by this method was repaired by accept-able means.
'de have found both the monitoring program and the examinations to be acce:: table and conclude that Cuquesne Light Com::any can continue to a:erate P78 099 7 911060 60k
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'^. C. N. Du n n Duquesne Light Company Oc cher 17, 1979 the EVPS Unit No. I without undue risk to the health and safety of the psblic with respect to feedwater ficw instability.
Sincerely,j i
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,G's::,.'..'Q~?!.?L-A. Schwencer, Chief Operating Reactors Branch #1 Division of C erating Reactcrs Encicsure:
Safety Evaluation cc: w/ enclosure See next page
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cc: Ge-ald Charnoff, Esquire Jay E. Silberg, Escuire Pl ant Su:er'n.e-ter-Snaw, Pi: man, ?ct s and Trcworidge 5 e a. e r '.'1* :5y :::.er Sta:f:n 1500 M Street, N.W.
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20036 Sh';;i ;;cr, Pen.s:lvania 15077 Karin Carter, Esquire Mr. Jchn A. Le in 5;ecial Assistant Attcrney General Public Utility crrissicn
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arristurg, Fernsyl.ania 17120 w
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5csten, Massachusetts 02107 "r. J. D. Wecdward R & D Center Westir.ghcuse Electric Ccrporation Builcing 7-303 Pittsburgh, Pennsylvania 15230
- 3. F. Jones "encrial Library 563 Franklin Avenue Aliquippa, Pennsylvania 15001 Mr. Jack Carey Technical Assistant Duquesne Light Company
- o. O. Box 4 Shippingpert, Pennsylvania 15077
r. R. E. Martin Cuquesne Light Cenpany 235 Sixth Avenue
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