ML16342B901

Forwards Safety Evaluation in Response to Bulletin 88-011, Pressurizer Surge Line Thermal Stratification

ML16342B901
Person / Time
Site:	Diablo Canyon
Issue date:	07/30/1992
From:	Rood H Office of Nuclear Reactor Regulation
To:	Rueger G PACIFIC GAS & ELECTRIC CO.
Shared Package
ML16341G646	List: ML16341G645 ML16342B901
References
IEB-88-011, IEB-88-11, TAC-M72129, TAC-M72130, NUDOCS 9208040280
Download: ML16342B901 (6)

Text

duly 30, 1992

~'ocket Nos.

50-275 and 50-323 Hr. Gregory H. Rueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P.O.

Box 770000 San Francisco, California 94106

SUBJECT:

CLOSEOUT OF STAFF ACTIVITIES ON NRC BULLETIN 88-11, "PRESSURIZER SURGE LINE THERMAL STRATIFICATION FOR DIABLO CANYON (TAC NOS.

H72129 AND H72130)

By letter of January 30, 1989, Pacific Gas and Electric Company (PG3E) provided your initial response to NRC Bulletin 88-11 for Diablo Canyon Units 1

and 2.

Your response indicated that PGSE had completed Bulletin Action l.a and provided a schedule for the completion of the remaining Bulletin items.

In your letter of February 1,

1990, you submitted WCAP-12415 and WCAP-12416, the proprietary and non-proprietary versions of the Westinghouse

report, "Evaluation of Thermal Stratification for the Diablo Canyon Pressurizer Surge Line."

Your letter concluded that thermal stratification would not affect the pressurizer surge line integrity for the design life of the units.

Finally, you concluded that Actions 1.b and 1.d of Bulletin 88-11 had been completed for Diablo Canyon Units 1

and 2.

The NRC staff has reviewed WCAP-12415 and finds the methodologies and conclusions of your submittal acceptable.

The staff's safety evaluation is enclosed.

This completes the staff effort on NRC Bulletin 88-11 for Diablo Canyon and closes TAC Nos.

H72129 and H72130.

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Enclosure:

'afety Evaluation cc/w enclosure:

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Harry Rood, Senior Project Manager Project Directorate V

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

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 duly 30, 1992 Docket Nos.

50-275 and 50-323 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 94106

SUBJECT:

CLOSEOUT OF STAFF ACTIVITIES ON NRC BULLETIN 88-11, "PRESSURIZER SURGE LINE THERMAL STRATIFICATION FOR DIABLO CANYON (TAC NOS, M72129 AND M72130)

By letter of January 30, 1989, Pacific Gas and Electric Company (PG&E) provided your initial response to NRC Bulletin 88-11 for Diablo Canyon Units 1

and 2.

Your response indicated that PG&E had completed Bulletin Action l.a and provided a schedule for the completion of the remaining Bulletin items.

In your letter of February 1,

1990, you submitted WCAP-12415 and WCAP-12416, the proprietary and non-proprietary versions of the Westinghouse

report, "Evaluation of Thermal Stratification for the Diablo Canyon Pressurizer Surge Line."

Your letter concluded that thermal stratification would not affect the pressurizer surge line integrity for the design life of the units.

Finally, you concluded that Actions 1.b and 1.d of Bulletin 88-11 had been completed for Diablo Canyon Units 1

and 2.

The NRC staff has reviewed WCAP-12415 and finds the methodologies and conclusions of your submittal acceptable.

The staff's safety evaluation is enclosed.

This completes the staff effort on NRC Bulletin 88-11 for Diablo Canyon and closes TAC Nos.

M72129 and M72130.

Sincerely,

Enclosure:

Safety Evaluation cc/w enclosure:

See next page Harry Rood, Senior Project Manager Project Directorate V

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

Hr. Gregory H. Rueger 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 Hs.

Sandra A. Silver Mothers for Peace 660 Granite Creek Road Santa Cruz, California 95065 Hs. 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 E Electric Company Post Office Box 7442 San Francisco, California 94120 Hr. 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 Hr. Peter H. Kaufman Deputy Attorney General State of California 110 West A Street, Suite 700 San Diego, California 92101 Hs.

Nancy Culver 192 Luneta Street San Luis Obispo, California 93401 Michael H. Strumwasser, Esq.

Special Assistant Attorney General State of California Department of Justice 3580 Wilshire Boulevard, Room 800 Los Angeles, California 90010

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