ML19254D075

Requests Addl Info Re Loss of Offsite Power on 731013 to Aid in Review of Offsite Power Sys Adequacy.Requests Response within 90 Days

ML19254D075
Person / Time
Site:	Point Beach
Issue date:	10/01/1979
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Burstein S WISCONSIN ELECTRIC POWER CO.
References
TAC-12955, TAC-12956, NUDOCS 7910220326
Download: ML19254D075 (3)

Text

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UNITED STATES NUCLEAR REGULATORY COMMISSION Q

WASHINGTON, D. C. 20555

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OCT 11979 Docket Nos. 50-266 and 50-301 Mr. Sol Burstein Executive Vice President Wisconsin Electric Power Company 231 West Michigan Street Milwaukee, Wisconsin 53201

Dear Mr. Burstein:

RE:

POINT BEACH NUCLEAR PLANT, UNIT NOS.1 AND 2 We are currently reviewing the adequacy of the offsite power systems of nuclear power plants and in particular, the loss of offsite power events at your facil ity. One aspect of this review concerns the history of experienced total and partial power outages and attendant degraded voltage or frequency conditions of the grid.

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In our review of this natter we are drawing upon the infomation you provided in Licensee Event Reports (LERs) and followup letters to the NRC.

Our review of a number of these LERs indicates that loss of offsite power occurred at your facility on October 13, 1973.

In order to complete our review of loss of offsite power events we require response to the enclosed request for infomation.

We request that you provide your response within 90 days of the receipt of this letter.

Sincerely f=

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A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors

Enclosure:

Recuest for Infomation vem cc: w/ enclosure See rext page

!l94 OC)4 79 220 P

s Mr. Sol Burstein Wisconsin Electric Power Company cc: Mr. Bruce Churchill, Esquire Shaw, Pittman, Potts and Trowbridge 1800 M Street, N.W.

Washington, D. C.

20036 Document Department University of Wisconsin Stevens Point Library Stevens Point, Wisconsin 54481 Mr. Glen Reed, Manager Nuclear Power Division Point Beach Nuclear Plant Wisconsin Electric Power Company 231 West Michigan Street Milwaukee, Wisconsin 43201 1194 095 6

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s ATTACHMENT For losses of offsite power where less than all offsite power was lost:

A.

How many circuits to the offsite network are ncemally available and how 1.

many were lost during the event?

2.

What was the cause of the event?

3.

Why did the other lines not fail when some did fail?

Was any voltage increase or decrease experier.ced just prior to or during 4

the outage?" 'If so, please give details, voltages reached, affects, etc.

Was any frequency decay experienced just prior to or during the outage?

5.

If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.

6.

How long was pcwer unavailable from the circuit?

7.

Date of r.ent.

3.

For losses of all offsite power:

1.

How long was the power off? How long for partial recovery? Please give details.

If turbine trip occurred, how soon after did loss of offsite power occur?

2.

If power was recovered promptly (10 minutes or less), was it due to automatic 3.

or manual actions?

4.

Was any voltage increase or decrease experienced just prior to or during the outage? If so, please give details, voltages reached, affects, etc.

Was any frequency decay experienced just prior to or during the outage?

5.

If so. please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.

5.

Dau of Event.

Were there any other loss of offsite ocwer events other than we have listed?

If so, please give details of each event.

l}9k 0)b

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