ML20024D406

Trip Rept of 830714 Site Visit for NRC & Lll to Obtain Addl Info Re Recurring Main Transformer Failures

ML20024D406
Person / Time
Site:	North Anna
Issue date:	07/25/1983
From:	Engle B Office of Nuclear Reactor Regulation
To:	Clark R Office of Nuclear Reactor Regulation
References
NUDOCS 8308040725
Download: ML20024D406 (5)

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JUL 2 51983

$ /) p. O /lo MEMORANDUM FOR:

Robert A. Clark, Chief Operating Reactor Branch #3 Division of Licensing FROM:

Leon B. Engle, Project Manager Operating Reactors Branch #3 Division, of Licensing

SUBJECT:

TRIP REPORT - SITE VISIT TO OBTAIN ADDITIONAL INFORMATION REGARDING RECURRING MAIN TRANSFORMER FAILURES (MTFs) AT THE NORTH ANNA POWER STATION (NAPS) ;

On July 14, 1983, the NRC and its consultant (Lawrence Livemore National Laboratory - LLNL) met at' NAPS regarding the subject noted.

above. A list of attendees is provided in the Attachment.

_(1) to hold a The purpose of the site visit was two-fold: discussion with the VEPC0 staff regard a p.lant tour was made to acquaint LLNL with the physical plant layout with respect to MTFs.

General Meeting Highlights' '

O LLNL pmsented a status' update on the various tasks identified in the NRC statement of, work.

O LLNL presented a short summary on the present conclusions of its Probabilistic Risk Assessment (PRA) evaluation of the generator;and transformer protection system.

For the PRA analysis, it has been detemined that the increase in frequency of MTFs and plant nactor trip does not degrade.the plant protection system. Also, no modi-fications are warranted for the NAPS MTF protection system.

O VEPCO reported that the' investigation of the seventh failure (December 5,1982) is. complete (report to follow).

O A question / answer period was held where NRC_ requested additional information from VEPC0 regarding the MTFs.

O VEPC0 will contact GE and McGraw Edison representatives to help assist in obtaining operating and maintenance instructions for MTs.

Site Visit t

0 Pictures were taken to provide LLNL orientation of the plant physical layout to assist in the Failure Mode and Effects Analysis (FMEA) for MT fires, missiles and oil-spills.

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.2-0 A tour of the turbine building and control room location was conducted with respect to potential MT missiles.

O A tour was made of the general area where reserve station service overhead lines have been relocated since the July 3,1981 MT fires.

0 A Status update was made by VEPC0 on any possible transformer bay modifications.

==

Conclusions:==

A formal NRC request for information to VEPC0 will be prepared based on the site visit and meet.ing discussions. A preliminary assessment following the tour determined that MTF missiles could have only insigni-ficant effects on LLNL's PRA and FEMA reports.. Oil spills and fins

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will be included and expanded on in the LLNL mports.

Criginal signed by 4

Leon B. Engle, Project Manager Operating Reactors Branch #3 ~

Division of Licensing

Attachment:

Attendance List

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NOC FORM 318 410,80l NRCM O240 OFFICIAL RECORD COPY

e MEETING

SUMMARY

DISTRIBUTION Licensee: Virginia Electric and Power Company

• Copies also sent to those people on service (cc) list for subject plant (s).

vDocket File NRC PDR L PDR NSIC ORB #3 Rdg ORB #3 Summary File JHcitemes BGrimes RAClark Project Manager PMKreutzer 0FJ.D ELJordan JMTaylor ACRS-10 NRC Participants JDonohue SNewberry MChiramal JKnight VBenaraya G

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Virginia Electric and Power Company cc:

Richard M. Foster, Esq.

Musick, Williamson, Schwartz, leavenworth & Cope, P.C.

P. O. Box 4579 Boulder, Colorado 80306 Mrs. Margaret Dietrich Route 2, Box 568 Michael W. Maupin, Esq.

Gordonsville, Virginia 22042 i

Hunton, Williams, Gay and Gibson P. O. Box 1535 Mr. W. T. Lough Richmond, Virginia 23212 Virginia Corporation Commission Division of Energy Regulation Mr. Paul W. Purdom P. O. Box 1197 Environmental Studies Institute Richmond, Virginia 23209 Drexel University 32nd and Chestnut Streets Mrs. June Allen Philadelphia, Pennsylvania 19104 North Anna Environmental Coalition 8720 Lockmoor Circle Atomic Safety and Licensin9 Wichita, Kansas 67207 Appeal Board Panel U.S. Nuclear Regulatory Commission U.S. Environmental Protection Agency Washington, D. C.

20555 Region III Office ATTN:

Regional Radiation Representative Ellyn R. Weiss, Esq.

Curtis Building Sheldon, Harman, Roisman and Weiss 6th and Walnut Streets 1725 I Street, N.W. Suite 506 Philadelphia, Pennsylvania 19106 Washington, D. C.

20006 Regional Administrator Mr. E. W. Harrell Nuclear Regulatory Commission, Region II P. O. Box 402 Cffice of Executive Director for Operations Mineral, Virginia 23117 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Mr. Anthony Gambardella Office of the Attorney General 11 South 12th Street - Room 308 Richmond, Virginia 23219 l

l Resident Inspector / North Anna c/o U.S.N.R.C.

Route 2, Box 78A Mineral, Virginia 23117 Mr'. J. H. Ferguson Executive Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261 l

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ATTACHMENT North Anna Power Station Site Visit July 14,1983 Attendance List NRC VEPC0 L. B. Engle J. Leberstien R. E. Nicholls LLNL R. W. Broocks N. G. Vidonic J. W. Savage E. W. Harrel J. C. Selan W. R. Cartwright K. J. Dalton (EG&G)

0. Compton W. Bugg H. Suttan K. S. Berger C. G. Chewing J. M. Mosticane D. E. Thomas J. R. Harper I

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