ML16342A223

Summary of 930810 Meeting W/Util in Rockville,Md to Discuss Licensee Proposed Eagle 21 Process Protection Sys Upgrade & Diversity from ATWS Mitigation Sys

ML16342A223
Person / Time
Site:	Diablo Canyon
Issue date:	08/18/1993
From:	Peterson S Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 9309020297
Download: ML16342A223 (10)

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UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket Nos.

50-275 and 50-323 LICENSEE:

Pacific Gas and Electric Company (PG&E)

FACILITY: Diablo Canyon Nuclear Power Plant, Units 1 and 2

SUMMARY

OF AUGUST 10, 1993 PUBLIC MEETING TO DISCUSS THE LICENSEE'S PROPOSED EAGLE 21 PROCESS PROTECTION SYSTEM UPGRADE AND THE DIVERSITY FROM THE ATWS MITIGATION SYSTEM On August 10,

1993, the NRC staff met with the Pacific Gas and Electric Company (PG&E or the licensee) in Rockville, Maryland to discuss the issue stated above.

A list of the attendees present at the meeting is enclosed.

The proposed Westinghouse Eagle 21 upgrade at Diablo Canyon would replace the Westinghouse 7100 analog process protection equipment with digital equipment that is intended to improve the reliability and availability of the reactor protection system.

The Eagle 21 upgrade is the subject of a license amendment request (LAR 92-05) submitted to the staff by PG&E on September 21, 1992.

This meeting was a follow up to the July 12, 1993 meeting held to exchange the licensee's perspective and the staff's perspective on the diversity issue in order to provide guidance on meeting the ATWS rule.

The ATWS rule (10 CFR 50.62) requires that the AMSAC system installed at Diablo Canyon utilize diverse equipment from the RPS from sensor output to the final actuation device.

At the meeting, the licensee presented its development'of functional block diagrams that could be used to determine diversity for a typical system.

NUREG-0493 was used as a basis for development of the block diagrams.

The licensee also explained the development of their diversity evaluation methodology using a flow chart.

For the specific issue under consideration, the licensee concluded that sufficient diversity is provided on much the same basis as previously presented in the draft WCAP diversity analysis.

The staff noted that use of the NUREG-0493 methodology to make judgements on the acceptability of diversity in this situation was very difficult due to the constraints of 10 CFR 50.62 which allows certain commonalities.

The staff obtained assistance from Lawrence Livermore National Labs (LLNL) in its evaluation of diversity between Eagle 21 and AMSAC using NUREG-0493.

The staff instructed LLNL to conduct their evaluation of diversity generically using the guidance contained in NUREG-0493 as a means of meeting the ATWS rule.

The staff's basic conclusion using NUREG-0493 analysis and the LLNL generic diversity evaluation was that sufficient diversity did not exist between Eagle 21 and AMSAC.

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August 18, 1993 Since the staff has not identified any concerns with the Eagle 21 upgrade other than the defense-in-depth/diversity

issue, the staff agreed to issue a

safety evaluation (SE) in September 1993.

In order to support the staff's review, the licensee agreed to finalize the existing draft WCAP on the diversity issue and submit it on the docket.

The staff's SE would address the acceptability of the Eagle 21 upgrade, leaving the issue of diversity to be addressed in a supplement.

The staff also agreed to meet with NRC management to discuss the outcome of the August 10 meeting and subsequently inform PGIEE of the results of that meeting, and the approach to ultimate resolution of the issue.

Original signed by: Hel'. Fields, Project Manager heri R. Peterson, Project Manager Project Directorate V

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

Enclosure:

List of Attendees cc w/enclosure:

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Since the staff has not identified any concerns with the Eagle 21 upgrade other than the defense-in-depth/diversity

issue, the staff agreed to issue a

safety evaluation (SE) in September 1993.

In order to support the staff's review, the licensee agreed to finalize the existing draft WCAP on the diversity issue and submit it on the docket.

The staff's SE would address the acceptability of the Eagle 21 upgrade, leaving the issue of diversity to be addressed in a supplement.

The staff also agreed to meet with NRC management to discuss the outcome of the August 10 meeting and subsequently inform PGKE'f the results of that meeting, and the approach to ultimate resolution of the issue.

Sheri R. Peterson, Project Manager Project Directorate V

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

Enclosure:

List of Attendees cc w/enclosure:

See next page

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Pacific Gas and Electric Company Diablo Canyon CC:

NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.

Box 369 Avila Beach, California 93424 Dr. Richard Ferguson, Energy Chair Sierra Club California 6715 Rocky Canyon

Creston, California 93432 Ms. Sandra A. Silver Mothers for Peace 660 Granite Creek Road Santa Cruz, California 95065 Ms. Jacquelyn C. Wheeler 3303 Barranca Court San Luis Obispo, California 93401 Managing Editor The County Telegram Tribune 1321 Johnson Avenue P. 0.

Box 112 San Luis Obispo, California 93406 Chairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Christopher J. Warner, Esq.

Pacific Gas

& Electric Company Post Office Box 7442 San Francisco, California 94120 Diablo Canyon Independent Safety Committee ATTN:

Robert T. Wellington, Esq.

Legal Counsel 857 Cass Street, Suite D

Monterey, California 93940 Mr. Hank Kocol Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94234 Regional Administrator, Region V

U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. Peter H. Kaufman Deputy Attorney General State of California 110 West A Street, Suite 700 San Diego, California 92101 Ms. Nancy Culver 192 Luneta Street San Luis Obispo, California 93401 Michael M. Strumwasser, Esq.

Special Assistant Attorney General State of California Department of Justice 3580 Wilshire Boulevard, Room 800 Los Angeles, California 90010 Mr. Gregory M. Rueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P.O.

Box 770000 San Francisco, California 94177

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ENCLOSURE ATTENDEES UGUST 10 1993 MEETING BETWEEN THE NRC STAFF AND PG&E TO DISCUSS DIVERSITY BETWEEN PROPOSED EAGLE 21 AND AMSAC SYSTEMS NAME Sheri Peterson Bob Sterdis Larry Erin Bill Miller Bob Fink John Hefler Robert C.

Webb Roger Johnson Klemme Herman Andrea Wilford Cliff Doutt Jared Wermiel J.

L. Mauck Paul J.

Loeser Jim Stewart ORGANIZATION NRR/DRPW/PDV Westinghouse Westinghouse Westinghouse MPR Associates PGKE PGLE PGKE PGE(E NRR/DRPW/PDV NRR/DRCH/HICB NRR/DRCH/HICB NRR/DRCH/HICB NRR/DRCH/HICB NRR/DRCH/HICB

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