ML17298A291

Forwards Request for Addl Info Re Adequacy of Station Electric Distribution Sys Voltages.Response Date Requested

ML17298A291
Person / Time
Site:	Palo Verde
Issue date:	03/28/1983
From:	Knighton G Office of Nuclear Reactor Regulation
To:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
References
NUDOCS 8304140484
Download: ML17298A291 (5)

Text

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MAR 88 198P DISTRIBUTION

~Document Control (50-528/529/530)

NRC PDR L PDR NSIC PRC System Docket Nos.:

50-528, 50-529 and 50-530 Mr. E. E. Van Brunt, Jr.

Vice President - Nuclear Projects Arizona Public Service Company Post Office Box 21666 Phoenix, Arizona 85036 LB¹3 Reading JLee EALicitra

Jordan, IE Taylor, IE

Attorney, OELD ACRS (16)

Tt1Novak

Subject:

Request for Additianal Information Palo Verde, Units 1, 2 and 3

In order to complete our review of the adequacy of station electric distribution system voltages for the Palo Verde Plant, we request that you provide the additional information discussed in Enclosure l.

The ab'ove review area has been discussed between your staff and the NRC staff at several times, during which the need for additional information was identified.

The purpose of this letter is to identify the specific information needed.

Please advise us as to when you plan to respond to this request.

If you have any questions regarding the request, you should contact Manny Licitra, the Licensing Project Manager.

Sincerely, Original signed by:

, George Mt. Knighton George H. Knighton, Chief Licensing Branch No.

3 Division of Licensing

Enclosure:

As stated cc:

See next page 8304140484 830328 PDR ADOCK 05000528 PDR OFFIC SURNA2oi OAT DL:LB¹3 EALicitra/yt

/jTT/83 DL 3

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NRG FORM 318 (10.80) NRCM 0240 OFFlCIAL RECORD COPY USG PO: 1981~3ro.980

4 a.

Palo Verde Mr. E.

E.

Van Brunt, Jr.

Vice President - Nuclear Projects Arizona Public Service Company P. 0.

Box 21666 Phoenix, Arizona 85036 CC:

Arthur C. Gehr, Esq.

Snell L Hilmer 3100 Valley Center Phoenix, Arizona 85073 Charles S. Pierson Assistant Attorney General 200 State Capitol 1700 Hest Washington Phoenix, Arizona 85007 Charles R. Kocher.

Esq

, Assistant Counsel James A. Boeletto, Esq.

Southern California Edison Company P. 0.

Box 800

Rosemead, California 91770 Ms. Marqaret Walker.

Deputy Director of Energy Programs Economic Planning and Development Office 1700 West Washington Phoenix, Arizona 85007 Mr. Rand L. Greenfield Assistant Attorney General

. Bataan Memorial Building Santa Fe, New Mexico 87503 Regional Adminstrator-Region V

U. S. Nuclear Regulatory Commission-1450 Maria Lane Suite 210 Walnut Creek, California

.94596 L

Kenneth Berlin, Esq.

Winston E Strawn Suith 500 2550 M Street, N.

W.

Washington, D.

C. '0037 Lynne Bernabei Government Accountability Project of the Institute for Policy'.

Studies 1901 gue Street, N.

W.

pashington, D.

C.

20009 Resident Inspector Palo Verde/NPS U. S.'Nuclear Regulatory Commission P. 0.

Box 21324 Phoenix, Arizona 85001 Ms. Patricia Lee Hourihan 6413 S. 26th Street Phoenix-. Arizona 85040

J

QLGSURE Your response to the Palo Verde SER open item regarding the adequacy of station electric. distribution system voltages is not complete.

Please provide thefollowing additional information:

l.

In the Palo Verde design, the first and second levels of undervoltage protection relays are set at 68% and 905 of the design voltage, respectively.

In view of these relay.setpoints, address a scenario where the system voltage degrades below your ESF equip'ment rating i.e. 755, but above 68K setpoint.

lie are concerned that ESf equipment may not start and. run under these conditions during the time delay-interval before'the second level of undervoltage relays are

'activated.'rovide the results of the above postulated scenario analysis.

" 2.

The staff requires that the second. level of undervolhage protection r'clays shall include coincident logic on a per bus basis to perclude spurious trips of. the offsite power source.

Describe the coincident logic for the second level of undervoltage protection relays for your design or justify th present design.

3.

Your voltage regulation study 'submitted on October 25',

1981 for cases 812 and 813 does not include minimum loading with offsite power supply at maximum expected grid voltage as required by staff position.

Modify your analysis to include this requirement.

In addition, provide your commitment and schedule to perform a test to verify your analysis.