ML17037B541

Letter Regarding Description of Events Which Occurred at Millstone Unit 2 During July 1976 Relating to Plant Operation and Equipment Failures During a Degraded Grid Voltage Condition

ML17037B541
Person / Time
Site:	Millstone, Nine Mile Point
Issue date:	08/11/1976
From:	Lear G Office of Nuclear Reactor Regulation
To:	Rhode G Niagara Mohawk Power Corp
References
Download: ML17037B541 (4)

Text

11 3976 Docket No. 50-220 AUG Niagara Vehawk Power Corporation ATTN: tlr. Gerald K. Rhode Yice President - Engineering 300 Erie Boulevard ltest Syracuse, New York 13202 Gentlemen:

RE: NINE HILE POINT Provided herein as Enclosure 1 is a description of events which occurred at Hillstone Unit Ho. 2 during July 1976 relating to plant operation and equipment failures during a degraded grid voltage condition.

On July 27, 1976, all utilities with operating reactor facilities received telephone notification fred the NRC of the events at the Hillstone Unit Ho. 2 facility. At that time members of yout staff were asked to investigate the vulnerability of your facility to similar degraded voltage conditions and to provide a response by telephone within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

As a result of our initial investigation and evaluation of the potential generic implications of the events at blillstone and our preliminary discussions with several licensees, we consider it necessary to require all operating reactor licensees to conduct a thorough evaluation of the problem and to 'submit formal reports.

Therefore, we request that you conduct an investigation of the issue as it affects your facility using the Request for Information detailed in Enclosure 2 as a guide, and provide the analyses and results within 30 days of your receipt of this letter.

The signed original and 39 copies of your response will be necessary.

OPFICE~

SURNAME~

DATE~

POTCI hEC.318 (Rev. 9-33) hZCM 0240 4 U, S. OOVERNMENT PRINTINO OPPICEI IST4 424 !44

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This request for gen'eric information was approved by GAO under a blanket clearance number B-180225 (R0072); this clearance expires July 31, 1977.

Sincerely,

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George Lear, Chief Operating Reactors Branch P3 Division of Operating Reactors

Enclosures:

1. Description of Events Millstone Unit No. 2 DISTRIBUTION:

2. Request for Information Docket NRC BDR cc: Arvin E. Upton, Esquire Local PDR LeBoeuf, Lamb, Leiby 8 MacRae ORBIII3 Rdg 1757 N Street, N. W. KRGoller Washington, D. C. 20036 TJCarter OELD Anthony Z. Roisman, Esquire OI8IE (3)

Roisman, Kessler and Cashdan LGear 1712 N Street, N. Il. TVerdery Lfashington, D. C. 20036 JGuibert CParrish DEisenhut Oswego City Library TBAbernathy 120 E. Second Street JRBuchanan Oswego, New York 13126 DRess (ACRS) (16)

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