ML19254D107

Requests Addl Info Re Loss of Offsite Power on 770920 to Aid in Review of Offsite Power Sys Adequacy.Requests Reponse within 90 Days

ML19254D107
Person / Time
Site:	Hatch
Issue date:	09/18/1979
From:	Ippolito T Office of Nuclear Reactor Regulation
To:	Whitmer C GEORGIA POWER CO.
References
TAC-10026, TAC-11262, TAC-12831, TAC-47044, NUDOCS 7910220381
Download: ML19254D107 (3)

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SEPTEYSER 1 8 G79 Docket No. 50-321 Mr. Charles F. Whitmer

' lice President - Engineering Georgia Power Company P. O. Box 4545.

Atlanta, Georgia 30302

Dear Mr. Whitmer:

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 facility. One aspect of this review concerns the history of experienced total and partial power outages and attendent voltage or frequency conditions of the grid.

In our review of this matter we have drawn upon the information provided to us via Licensee Event Reports and follcwup letters which you have sent to us. Our review of these reports indicated the loss of offsite power events have occurred at Hatch Unit No.1 on September 20, 1977.

To complete our review of loss of offsite power events we require the additional infomation concerning the Hatch Unit No.1 off:ite grid indicated in the enclosure to this letter.

Please provide your response to the attached questions for Hatch Unit

'No. I within 90 days of receipt of this letter.

Si ncerely,

/

Thomas u}'. Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors

Enclosure:

Request for Additional Infomation cc w/ enclosure:

See next page 2

35-3 79102 u o 36 l

S' s

Mr. Charles F. Whitmer Georgia Power Company 2-SEPTEM3Ea 1 g 1373 cc:

G. F. Trowbridge, Esquire Shaw, Pittman, Potts and Trowbridge 1800 M Street, N. W.

Washington, D. C.

20036 Ruble A. Thomas Vice President P. O. Box 2625 Southern Services, Inc.

Birmingham, Alabama 35202 Mr. Harry Majors Southern Services, Inc.

300 Office Park Birmingham, Alabama 35202 Mr. William Widner Georgia Power Company Power Generation Department P. O. Box 4545 Atlanta, Georgia 30302 Mr. L. T. Gucwa Georgia Power Company Engineering Department P. O. Box 4545 Atlanta, Georgia 30302 App 1'ing County Public Library Parker Street Baxley, Georgia 31413 Mr. R. F. Rogers V. S. Nuclear Regulatory Conmission P.'O. Box 710 Baxley, Georgia 31513 2

356

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s RE00EST FOR ADCITIONAL INFORMATION A.

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

1.

How many circuits to the offsite network are normally available and how many were lost during the event?

2.

What was the cause of the event?

3.

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

4.

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

5.

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

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

6.

How long was power unavailable from the circuit?

7.

Date of Event.

B.

For losses of all offsite power:

1.

How long was the power off? How long for partial recovery?

Please rive details.

2.

If turbine trip occurred, how soon after di.d loss of offsite power occur?-

3.

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

5.

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

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

6.,

Date of Event.

C.

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

If so, please give details of each event.

.