ML17306B226

Forwards Sser Concluding That Load Testing of Alternate Ac Sources on Approx Yearly Basis Will Not Provide Sufficient Data Base to Demonstrate Required 95% Reliability of Gas Turbine Generators Under Load.Response Requested

ML17306B226
Person / Time
Site:	Palo Verde
Issue date:	01/04/1993
From:	Trammell C Office of Nuclear Reactor Regulation
To:	Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
Shared Package
ML17306B227	List: ML17306B226 ML17306B228
References
TAC-M68579, TAC-M68580, TAC-M68581, NUDOCS 9301070025
Download: ML17306B226 (6)

Text

Docket Nos. 50-528, 50-and 50-530 Mr. William F.

Conway Executive Vice President, Nuclear Arizona Public Service Company P.O.

Box 53999

Phoenix, Arizona 85072-3999

Dear Mr. Conway:

January 4,

199

SUBJECT:

STATION BLACKOUT SUPPLEMENTAL SAFETY EVALUATION PALO VERDE NUCLEAR GENERATING STATION (TAC NOS.

H68579, H68580, AND H68581)

The NRC staff has completed its review of your letter of October 2,

1992, wherein, you responded to the single open item regarding NRC's review of your implementation of the Station Blackout Rule, 10 CFR 50.63.

As discussed in more detail in the enclosed Supplemental Safety Evaluation (SSE),

the NRC staff is concerned that load testing of the alternate AC sources on an approximately yearly basis, rather than on a 3-month basis, will not provide a sufficient data base to demonstrate the required 95% reliability of the gas turbine generators under load.

Therefore, you should implement the 3-month load test or describe how you propose to demonstrate the required reliability.

You are requested to provide a response to this matter within 60 days of your receipt of this letter.

This request for information affects fewer than 10 respondents.

Therefore, it is not subject to Office of Management and Budget review under Pub.

L.96-511.

Please contact us should you have any questions regarding this request.

Sincerely, Original signed by Charles M. Trammell, Sr. Project Manager Project Directorate V

Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosure:

Supplemental Safety Evaluation cc. w/enclosure:-

See next page

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555 January 4,

1993 Docket Nos. 50-528, 50-529 and 50-530 Mr. William F.

Conway Executive Vice President, Nuclear Arizona Public Service Company P.O.

Box 53999

Phoenix, Arizona 85072-3999

SUBJECT:

STATION BLACKOUT SUPPLEMENTAL SAFETY EVALUATION -

PALO VERDE NUCLEAR GENERATING STATION (TAC NOS.

M68579, M68580, AND M68581)

The NRC staff has completed its review of your letter of October 2,

1992, wherein you responded to the single open item regarding NRC's review of your implementation of the Station Blackout Rule, 10 CFR 50.63.

As discussed in more detail in the enclosed Supplemental Safety Evaluation (SSE),

the NRC staff is concerned that load testing of the alternate AC sources on an approximately yearly basis, rather than on a 3-month basis, will not provide a sufficient data base to demonstrate the required 95K reliability of the gas turbine generators under load.

Therefore, you should implement the 3-month load test or describe how you propose to demonstrate the required reliability.

You are requested to provide a response to this matter within 60 days of your receipt of this letter.

This request for information affects fewer than 10 respondents.

Therefore, it is not subject to Office of Management and Budget review under Pub.

L.96-511.

Please contact us should you have any questions regarding this request.

Sincerely,

Enclosure:

Supplemental Safety Evaluation cc w/enclosure:

See next page Charles H. Trammell, Sr. Project Manager Project Directorate V

Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation'

r

Mr. William F.

Conway Arizona Public Service Company Palo Verde CC:

Nancy C. Loftin, Esq.

Corporate Secretary 8 Counsel Arizona Public Service Company P. 0.

Box 53999, Mail Station 9068 Phoenix, Arizona 85072-3999 James A. Beoletto, Esq.

Southern California Edison Company P. 0.

Box 800

Rosemead, California 91770 Senior Resident Inspector U.S. Nuclear Regulatory Commission HC-03 Box 293-NR

Buckeye, Arizona 85326 Regional Administrator, Region V

U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations ABB Combustion Engineering Nuclear Power 12300 Twinbrook Parkway, Suite 330 Rockville, Maryland 20852 Mr. William A. Wright, Acting Director Arizona Radiation Regulatory Agency 4814 South 40 Street

Phoenix, Arizona 85040 Chairman Maricopa County Board of Supervisors ill South Third Avenue

Phoenix, Arizona 85003 Jack R.

Newman, Esq.

Newman 5 Holtzinger, P.C.

1615 L Street, N.W., Suite 1000 Washington, D.C.

20036 Curtis Hoskins Executive Vice President and Chief Operating Officer Palo Verde Services 2025 N. 3rd Street, Suite 220

Phoenix, Arizona 85004 Roy P.

Lessey, Jr.,

Esq.

Bradley W. Jones, Esq.

Arkin, Gump, Strauss, Hauer and Feld El Paso Electric Company 1333 New Hampshire Ave., Suite 400 Washington, D.C.

20036

C

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