ML19345G073

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Forwards Request for Addl Info for Review of Util Re Adequacy of Station Electric Distribution Sys Voltages
ML19345G073
Person / Time
Site: Indian Point Entergy icon.png
Issue date: 02/02/1981
From: Varga S
Office of Nuclear Reactor Regulation
To: Berry G
POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
References
NUDOCS 8102190891
Download: ML19345G073 (6)
v • d • e


Text

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UNITED STATES

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i NUCLEAR REGULATORY COMMISSION ct

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,C W ASHINGTON, D. C. 20555

\\, '..<..,e February 2,19BI 8

Docket No. 50-286 Mr. George T. Berry, President and Chief Operating Officer Power Authority of the State of New York 10 Columbus Circle New York, New York 10019 Cear Mr. Serry:

4 We bave reviewed your letter of May 30, 1980 concerning the adequacy of station electric distribution system voltages for Indian Point, Unit 3.

In order *w continue our review, we have enclosed a request for additional information.

Please respond within 30 days of receipt of this letter.

S$ncerely(,

\\i er a Chi n

Operating Reactors kanch pl Division of Licensing

Enclosure:

Recuest for Additional Information on Acecuacy of Station Electric Distribution System voltages cc:

See next :: age i

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F.r. George T. Berry Power Authority of the State of New York cc: White Plains Public Library Mr. J. P. Bayne, Senior Vice Pres.

100 Martine Avenue Power Authority of the State White Plains, New York 10601 of New York 10 Columbus Circle Mr. Charles M. Pratt New York, New York 10019 Assistant General Counsel Power Authority of the Mr. S. S. Zulla, Resident Manager State of New York Indian Point 3 Nuclear Power Plant 10 Columeus Circle P. O. Box 215 New York, New York 10019 Buchanan, New York 10511 i

Ms. Ellyn Weiss Ezra I. Bialik Sheldon, Harmon and Weiss Assistant Attorney General 1725 I Street, N.W., Suite 506 Environmental Protection Bureau Washington, D. C.

20006 New York State Department of Law 2 World Trade Center Dr. Lawrence D. Quarles New York, New York ~10047 Acarcment 51 Kendal at Longwood Kennett Scuare, Pennsylvania 19348 Mr. George M. Wilverding Manager - Nuclear Licensing Power Authority of the State of New York 10 Columbus Circle New York, New York 10019 Theodore A. Rebelowski l

Resident Inspector Indian Point Nuclear Generating U. S. Nuclear Regulatory Commission Post Office Box 38 Buchanan, New York 10511 Joan Holt, Project Director New York Public Interest Research Group, Inc.

5 Seekman Street New York, New York 10038 l

f

~-

INDIAN POINT UNIT 3 (Dccket No. 50-286)

REQUEST FOR ADDITIONAL INFORMATION ON ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES

References:

NRC generic let:er to all Power Reactor Licsensees, " Adequacy of Sta-a.

ion Electric Distribution System Voltages," dated August 8, 1979.

5.

PASNY le: er, Paul J. Early, to S. Varga, Opera:ing Reactors Branch No. 1, NRC, Docket No. 50-286, May 30, 1980.

Questions:

1.

Tne response to Question la in your submittal of May 30, 1980 iden-tifies the nor=al operating range of the voltages a: the Buchanan Subs:ation for the 343kV, 138kV, and the 13.SkV systems as 347kV to 23SkV, 136kV to 142kV, and 13.7kV to 14.1kV, respectively. Guide-3 line 6 reques:ed :na the minimum expected value of the grid voltage be selected based en the least of three conditions. Which of these

onditions applies :o the minimum vol: age identified in your submittal?

J.

Assuming the 13.SkV source is supplying buses 5 and 6 (the 138kV source is out of service), what would be the effect on the 13.8kV source and loads considering a uni: trip and a fast transfer of the four 6.9kV buses 1, 2, 3, and 4 to the 13.8kV source?

Specifically, this assumes the 13.SkV supply would sustain a voltage transient. Wha't is the

=inimum and ::ansien: voltage, :he transien: duration, and the final val: age?

s :ne fas: transfer of :he fout 6.9kV buses and loads pre-vented ay interlocking or Limiting Condi:icas of Operation noted in
he Tecnnical Specifications? Please clarify.

3.

Wi:h all possi:le class lE loads 'upplied frem the 13.8kV system, what s

would be the transien: effect en the distribu:icn system due to the start of a large acn-1E load?

(?,efer to Guideline 6".)

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4.

Regarding maximum grid vol: age conditions, your response to Ques-tion Ic states tha:, " voltage would have a negligible effect on equipment life and will not cause equipment damage." Does this state-men: consider a sustained overvoltage'(or undervoltage) on motor con-trol circuit components (control power transformers, starter coils, fuses, etc.), battery chargers, and other systems operated from the j

class 1E 480V supply at voltages below 480V? 480V mo:or starters usually opera:e between 90 and 110%, and i: appears from Table 2 that the starters on MCC 36A would be required :o operate a: less.than 90%. Please clarify.

~

5.

a.

When do you expect to supply :est resul:s per your response :o Question 5 ?

i b.

On which "480V buses" will you cbtain carren: and voltage 3

measuremen:s?

c.

Your reponse to question 5 refers :o MCO 26A and 26B.

Shouldn't this be 36A and 363?

d.

What is the expected load on all buses tha: will be used to obtain measured values?

If loading is less than 30%, your results should document instru=entation accuracy and demons: rate that each bus is suf ficien:1y loaded to obtain accura:e readings.

l l

6.

Refer to tne attached drawings SK-6868-1 for 1?3 and SK-6591-1 for i

1P2. Explain the opera: ion of :he 20XVA transformers circled on these l

drawings.

1: appears that one of the transformers may be able to i

supply all loads to Indian Point 2 and 3.

If operation of one ::ans-f ormer to both uni:s is no: preven:ed by in:erlocking or Limiting Condi: ions of Opera: ion, please provida an analysis for this condi: ion.

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