ML17310A663

Approves Use of 0.3 G Seismic Review Level Earthquake (RLE) Re Response to GL 88-20,Suppl 4, Individual Plant Exams for External Events for Palo Verde Nuclear Generating Station. Safety Evaluation Supporting Reduction of RLE Level Encl

ML17310A663
Person / Time
Site:	Palo Verde
Issue date:	09/27/1993
From:	Linh Tran Office of Nuclear Reactor Regulation
To:	Conway W ARIZONA POWER AUTHORITY
Shared Package
ML17310A664	List: ML17310A663 ML17310A665
References
GL-88-20, TAC-M83654, TAC-M83655, TAC-M83656, NUDOCS 9310010178
Download: ML17310A663 (7)

Text

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+~*y4 UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 September 27, 1993 Docket Nos. 50-528, 50-529, and 50-530 Hr. William F.

Conway Executive Vice President, Nuclear Arizona Public Service Company Post Office Box 53999

Phoenix, Arizona 85072-3999

SUBJECT:

REVIEW OF

RESPONSE

TO GENERIC LETTER NO. 88-20, SUPPLEHENT NO. 4 INDIVIDUAL PLANT EXAMINATIONS FOR EXTERNAL EVENTS FOR PALO VERDE NUCLEAR GENERATING STATION (TAC NOS. H83654,

H83655, AND H83656)

The NRC issued Supplement 4 to Generic Letter 88-20 on June 28, 1991, to require each licensee and each Construction Permit holder to conduct an individual plant examination of external events (IPEEE).

Guidance was provided with the generic letter supplement in the form of NUREG-1407, "Procedural and Submittal Guidance for the Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities."

The supplement requested a response that would 1) identify the method and approach selected for the

IPEEE,

2) describe the method to be used if it has not been submitted previously for staff review, and 3) identify the milestones and schedule for performing the IPEEE and submittal of the results to the NRC.

By letter dated December 26,

1991, you responded to Generic Letter 88-20, Supplement 4.

In this letter, you proposed alternative methods to satisfy the IPEEE requirements for your plant.

You also requested that the seismic review level earthquake (RLE) for Palo Verde be modified from 0.5g to 0.3g.

In a letter dated June 17,

1992, the staff concluded that the proposed alternative methods satisfy the IPEEE requirements as compared to the methods described in NUREG-1407.

However, the staff concluded that the information provided was not adequate to justify the reduction in RLE for Palo Verde.

In a letter dated August 4,

1992, you submitted a supplemental seismic hazard analysis and requested additional review.

You also requested to delay the submittal date for the seismic portion of the IPEEE to June 1995.

The,staff reviewed your submittal and approved the proposed IPEEE submittal date, but found that the information provided was still not adequate to justify such a

reduction in the RLE.

The staff's request for additional information was issued on February 9, 1993, followed by a meeting with your staff on February 16, 1993, to discuss and clarify, where necessary, the staff's request.

You provided a detailed response on Hay 6, 1993, followed by a conference call on July 2, 1993, to address the staff's questions.

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Mr. William F.

Conway We have reviewed your response and hereby approve the use of a 0.3g RLE for the Palo Verde site.

A copy of our evaluation is enclosed.

Sincerely,

Enclosure:

Safety Evaluation cc w/enclosure:

See next page Linh N. Tran, Project Manager Project Directorate V

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

ptember 27, 1993 Mr. William F.

Conway We have reviewed your response and hereby approve the use of a 0.3g RLE for the Palo Verde site.

A copy of our evaluation is enclosed.

Sincerely, Original signed by:

Enclosure:

Safety Evaluation cc w/enclosure:

See next page DISTRIBUTION:

Docket File NRC

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/0793 OFFICIAL RECORD COPY DOCUMENT NAME: PV83654.LTR

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Hr. William F.

Conway Arizona Public Service Company Palo Verde CC:

Hr. Steve Olea Arizona Corporation Commission 1200 W. Washington Street Phoenix, Arizona 85007 James A. Beoletto, Esq.

Southern California Edison Company P.

O.

Box 800

Rosemead, California 91770 Senior Resident Inspector Palo Verde Nuclear Generating Station 5951 S: Wintersburg Road

Tonopah, Arizona 85354-7537 Regional Administrator, Region V

U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Hr. Charles B. Brinkman, Manager Washington Nuclear Operations ABB Combustion Engineering Nuclear Power 12300 Twinbrook Parkway, Suite 330 Rockville, Maryland 20852 Hr. Aubrey V. Godwin, Director Arizona Radiation Regulatory Agency 4814 South 40 Street Phoenix, Arizona 85040 Chairman Haricopa County Board of Supervisors 111 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 Hr. 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.

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

20036 Hr. Thomas R. Bradish, Hanager Nuclear Regulatory Affairs Arizona Public Service Company P.

O.

Box 52034

Phoenix, Arizona 85072-2034