ML19345G496

Forwards Request for Addl Info for Review of Util Re Adequacy of Station Electric Distribution Sys Voltages. Requests Response within 60 Days

ML19345G496
Person / Time
Site:	Point Beach
Issue date:	03/26/1981
From:	Clark R Office of Nuclear Reactor Regulation
To:	Burstein S WISCONSIN ELECTRIC POWER CO.
References
TAC-12955, TAC-12956, NUDOCS 8104070387
Download: ML19345G496 (4)

Text

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'c, UNITED STATES NUCLEAR REGULATORY COMMISSION 2

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W ASHINGTON, D. C. 205t5 t

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March 26, 1981

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Docket Nos. 50-266 and 50-301 F

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7 Mr. Sol Burstein ti

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Wisconsin Electric Power Company

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Dear Mr. Burstein:

In conducting our review of your letter of Januari 21, 1981 relating to i

the adequacy of station electric distribution system voltages at Point Beach Nuclear Plant, Units No. 1 and 2, we have determined that we will need the additional information identified in the enclosure to continue the review.

In order for us to maintain our review schedule, your response is requested within 60. days of your receipt of this letter. Three signed originals and forty copies are required.

Please contact us if you have any questions concerning this request.

Sincerely.

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}RobertA. Clark, Chief $-dx Ye Operating Reactors Branch #3 Division of Licensing

Enclosure:

Request for Additional l

Information cc w/ enclosure:

.See next page O

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p 8104070 3Q-

x Wisconsin, Electric Power Corpany CC:

Mr. Bruce Churchill, Esquire Mr. William Guldemand Shaw, Pittman', Pott's and Trowbridge USNRC Resident inspectors Office 1800 M Street, N. W.

66.12 Nuclear Road Washington, D. C.

20036 Two Rivers, Wisconsin 54241 Joseph Mann Library 1516 Sixteenth Street Tuo Rivers, Wisconsin 54241 Mr. Glenn A. Reed, Manager Nuclear Operations Wisconsin Electric Power Cocpany Point Beach Nuclear Plant 6610 Nuclear Road Two Rivers. Wisconsin 54241 Mr. Gordon Blaha Town Chairman Tewri of Two Creeks Route 3 Two Rivers, Wisconsin 54241 Ms. Kathleen M. Falk General Counsel Wisconsin's Environmental Decade 302 E. Washington Avenue Madison, Wisconsin 53703 Director, Criteria and Standards Division Office of Radiation Programs (ANR-460)

U.S. Environmental Protection Agency Washington, D. C.

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U. S. Environmental Protection Agency Federal Activities Branch Region V Office ATTN: EIS C0ORDINATOR 230 S. Dearborn Street Chicago, Illinois 60604 t

Chairman Public Service Commission of Wisconsin Hills Farms State Office Building Madison, Wisconsin 53702

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REQUEST FOR_ ADDITIONAL INFORMATION POINT BEACH NUCLEAR PIANT, UNITS 1 AND 2 Date:

March 20,1981

Subject:

Adequacy of Station Electric Distribution System Voltages (Part B)

Ref. 1:

NRC generic letter to all power reactor licensees, dated August 8, 1979.

Ref. 2:

WEPCO letter (C. W. Fay) to the NRC (U. Gacmill),

dated October 12, 1979.

Ref. 3:

WEPCO letter (C. W. Fay) to the NRC (R. A. Clark),

dated January 21, 1981.

1.

Reference 3, Guideline 3 requests that all automatic actions should be analyzed.

The purpose of these calculations is to allow an evaluation of minimum transient voltages to ensure the v'oltage remains adequate to start all Class IE ' equipment and to ensure that starters and contactors will not drop due to a momentary undervoltage.

Please submit analyses of the transient voltages that would be experienced under the following conditions:

a)

The transfer of auxiliary loads b)

The startup of the Class 1E loads c)

The startup of a large non-Class IE load.

These analyses should be calculated under the assumption of maximum load /

=inimum-expected grid-voltage conditions. Also show that the voltages and durations of the transients will not cause a spurious trip by the degraded voltage relays.

2.

Submit an analysis of the effect of maximum-load /=inimum expected grid-voltage on any low-voltage (less than 460 volt) Class 1E equipment or centrol circuits.

The analysis should address both steady state and transient cer.ditions.

3.

Reference 2, Enclosure 1, page 2 addresses =aximum voltages.

Cuideline 11 of Reference 1 requests that an analysis be made at minimum-load /caxi=uc-

. expected grid-voltage.

Please clarify the conditions under which the maximum voltage calculations were made.

4.

Reference 2, Enclosure 2, page 1 addresses verification tests.

Provide a schedule for when the test results will be submitted.

5.

Reference 1, page 2 requests a review of the electric power systees of each plant _to determine if any potential exists for violation of CDC-17.

Please submit the results of this review.

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Reference 1, Guideline 2 requires a separate voltage analysis be submitted for =ulti-unit stations. This voltage analysis should assume an accident or anticipated transient in one unit and the, simultaneous shutdown of the

.cther unit.

Reference 3, page 2 states that the Technical Specifications preclude operation of both units with the station auxiliaries of each unit being supplied from a single low-voltage station auxiliary transformer or a single high-voltage station transformer. Technical S pe cifications.15. 3. 7-3.1 (c) confirm this statement for the low-voltage station auxiliary trans-former but a similar Technical Specification covering the high voltage station auxiliary transformer was not listed.

Please submit an analysis as required by Guideline 2, Reference 1 or subnit the necessary LCO's.

NOTE: Af ter the licensee has received the above requests, a conference ca11'should be arranged to clarify or expand any points that the licensee cay have regarding the evaluation.

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