ML20054H648

Forwards Request for Addl Info Re Adequacy of Station Electric Distribution Sys Voltages.Response Requested within 60 Days of Receipt of Ltr

ML20054H648
Person / Time
Site:	Millstone
Issue date:	06/15/1982
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Counsil W NORTHEAST NUCLEAR ENERGY CO.
References
LSO5-82-06-055, LSO5-82-6-55, TAC-12672, TAC-48333, NUDOCS 8206240294
Download: ML20054H648 (4)

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DISTRIBUTION Docket June 15, 1982 NRC POR Local POR ORB Reading Docket Nos. 50-245 NSIC and 50-336 0Crutchfield LS05-82-06-055 HSmith JShea MConner Kr. W. G. Counsil. Vice President OELD 2

Nuclear Engineering and Operations 0I&E Northeast Nuclear Energy Company ACRS (10)

P. O. Box 270 SEPB flartford, Connecticut 06101

Subject:

Adequacy of Station Electric Distribution System Voltages -

Hillstone Station Units 1 and 2 Re fe. ence: Your letter dated April 21, 1982 The staff is continuing its review of the captioned matter and has determined that the infonnation described in the enclosure to this letter is necessary before we can complete our review.

Your response is requested within 60 days of your receipt of this letter.

This request related to a submittal which is specific to Millstone Units 1 and 2.

Therefore, OMB clearance is not required under P. L.96-511.

Si,ncerely.

Original signed by Dennis H. Crutchfield, Chief Orierating Reactors Branch #5 Division of Licensing g60/

Enclosure:

Request for Additional Information giu 8206240294 820615 PDR ADOCK 05000245 P

PDR ORB #5:D OR8'8 0

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Mr. W. G. Counsil June 15, 1982 cc William H. Cuddy, Esquire State of Connecticut

. Day, Berry & Howard Office of Policy & Management Counselors at Law ATTN:

Under Secretary Energy. _

One Constitution Plaza Division Hartford, Connecticut 06103 80 Washington Street Hartford, Connecticut 06115 Ronald C. Haynes, Regional Administrator-

. Fi-Region I Office

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• Nuclear Regulatory Commission as e 631 Park. Avenue

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'l King of Prussia, Pennsylvania 19406

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. Northeast Nuclear Energy' Company ATTN:

Superintendent Millstone Plant P. O. Box 128

-Waterford, Connecticut 06385 Mr. Richard T. Laudenat Manager, Generation Facd.11 ties Licensing - - =-

Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Resident Inspector

.c/o U. S. NRC P. O. Box Drawer KK Niantic, Con'necticut 06357 First Selectman of the Tbwn of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F. Opeka

'" - Systems Superintendent Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 U. S. Environmental Protection Agency Region I Office ATTN:

Regional Radiation Representative JFK Federal Building Boston, Massachusetts 02203 e

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REQUEST FOR ADDITIONAL INFORMATION MILLSTONE 1 ~

ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES REF. 1:

NU Letter (W. G. Counsil) to NRC (D. M. Crutchfield), dated.

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November 14, 1980 C

REF. 2:

NU Letter - (W. 'G. Counsil) to 'NRC-TD. M. Crutchfield and R.. A. Clark.), *

.7 dated April 21, 1982

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C-(1) Submit an analysis on the MCC contactor voltages for the following "casiis:

s (a) Case 9 of Ref. 1:

Demonstrate that tlye voltage transients'due to the LOCA loads starting are abo've the contactor's minimum pickup voltage rating as stated in Ref. 2.

(b) Cases 3 and 10 of Ref. 1:

Demonstrate _that the steady state voltag'e is within the continuous ' operating range (minimum and maximum rating) for the contactps.

(c) Case 12 of Ref. 1:

Demonstrate that the starting of the condensate booster pump will not cause contactors for the running Class 1E equipment to drop out (dropout rating in Ref. 2)..

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(2) Ref. 2, Question 4 - How long would it take for the voltage transient of 351 volts to recover to the 75% itart ratitig (380 volts) and verify that this voltage transient and recovery time would not interfere with the starting capability of additional Class lE loads (load sequencing)?

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REQUEST FOR ADDITIONAL INFORMATION s

MILLSTONE 2 '

ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES y

REF. 1:

NU Letter (W. G. Counsil) to NRC (R. A. Clark), dated December 19, 1980-REF. 2: NU Letter, (W. G. Counsil) to NRC '(D. M. Crutchfield and R. A. Clark),

dated. April 21, 1982 1

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(1) Submit an analysis on the MCC contactor voltages!for the following cases:

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(a) Case 5.,of Ref. 1:

Demonstrate that the. voltage transients due 3

"' P to the LOCA loads starting are abbve the contactor's minimum

. pickup voltage rating as stated in'Ref. 2.

(b) Cases 3 and 6 of Ref. 1:

Demonstrate that the steady state voltage is within the continuous operating range (minimum and maximum rating) for the contactorg.

(c) Case 7 of Ref. 1: Demonstrate that the s~ tarting of the reactor coolant pump will not cause contYe% rs for the running Class lE equipment to drop out (dropout rating in Ref. 2).

(2) Case 5 of Ref. 1 notes that starting the LOCA loads will cause a bus voltage transient on Bus 22E of 378 volts.. Starting a 460-volt Class 1E motor during this interval with a 50-volt starting drop will.

result in 328 volts at the motor terminals. This voltage is below the start rating of 345 volts.

In what time frame will this voltage transient recover to the 345-volt level (75% of 460 volts) and the 414-volt level (90% of 460 volts)? Verify that this voltage transient e-and recovery time will not interfere wi.th the starting capability of l

additional Class 1E loads (load sequ,encing).

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