ML16342C715
| ML16342C715 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/12/1994 |
| From: | Quay T Office of Nuclear Reactor Regulation |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML16342C716 | List: |
| References | |
| TAC-M86194, TAC-M86195, NUDOCS 9411030239 | |
| Download: ML16342C715 (8) | |
Text
I...
Docket 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 94177
Dear Hr. Rueger:
October 12, 1994
SUBJECT:
DIABLO CANYON NUCLEAR POWER PLANT, UNIT, NOS.
1 AND 2 ASME CODE SECTION III RELIEF REQUEST (TAC NOS.
H86194 AND H86195)
Your April 13, 1993, letter requested permanent relief for Diablo Canyon Power Plant, Units 1 and 2, from ASME Code Section III, Subsection NC-7142 stop valve control and interlock requirements.
You requested this relief because the positive displacement pump (PDP) relief valve discharge line block valve in both Units 1
and 2 does not have controls and interlocks.
ASHE Code Subsection NC-7142 requires controls and interlocks on stop valves when they are installed in relief valve piping.
We granted you interim relief in our April 15, 1993, letter.
You also responded to our request for additional information in your February 11, 1994, letter.
We grant relief from the ASME Section III, Subsection NC-7142 control and interlock requirements for PDP relief valve discharge line stop valves CVCS-1-831 and CVCS-2-831.
This allows you to use specific administrative controls on these block valves at Diablo Canyon instead.
We find that you have demonstrated that complying with Code requirements would result in hardship or unusual difficulty without a compensating increase in the level of quality and safety.
We also conclude that granting relief would not result in adverse safety consequences for accident scenarios associated with the installed block valve configuration.
The enclosed safety evaluation contains our review results.
- S'ely, Theodore R.
Quay, Director Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation
Enclosure:
DISTRIBUTION:
Safety Evaluation 9
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Docket 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 94177 October 12, 1994
Dear Hr. Rueger:
SUBJECT:
DIABLO CANYON NUCLEAR POWER PLANT, UNIT NOS.
1 AND 2 ASME CODE SECTION III RELIEF REQUEST (TAC NOS.
H86194 AND H86195)
Your April 13, 1993, letter requested permanent relief for Diablo Canyon Power Plant, Units 1
and 2, from ASHE Code Section III, Subsection NC-7142 stop valve control and interlock requirements.
You requested this relief because the positive displacement pump (PDP) relief valve discharge line block valve in both Units 1 and 2 does not have controls and interlocks.
ASHE Code Subsection NC-7142 requires controls and interlocks on stop valves when they are installed in relief valve piping.
We granted you interim relief in our April 15, 1993, letter.
You also responded to our request for additional information in your February 11, 1994, letter.
We grant relief from the ASHE Section III, Subsection NC-7142 control and interlock requirements for PDP relief valve discharge line stop valves CVCS-1-831 and CVCS-2-831.
This allows you to use specific administrative controls on these block valves at Diablo Canyon instead.
We find that you have demonstrated that complying with Code requirements would result in hardship or unusual difficulty without a compensating increase in the level of quality and safety.
We also conclude that granting relief would not result in adverse safety consequences for accident scenarios associated with the installed block valve configuration.
The enclosed safety evaluation contains our review results.
Theodore R.
Quay, Director Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/enclosure:
See next page DISTRIBUTION:
Docket File WRussell/FHiraglia LSpessard JRoe TQuay SPeterson DFoster-Curseen OC/LFDCB, T-9E10 NRC
& Local PDRs RZimmerman JLieberman EAdensam SPeterson ACRS (10)
JHitchell, EDO
EJordan BJones RWessman OFFICE:
NAME:
LA:DRPW
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/9/94
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)0p*y4 UNlTED STATES NUCLEAR REGULATORY COMIVllSSION WASHINGTON, D.C. 20555-0001 October 12, 1994 Docket 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 94177
Dear Hr. Rueger:
SUBJECT:
DIABLO CANYON NUCLEAR POWER PLANT, UNIT NOS.
1 AND 2 ASHE CODE SECTION III RELIEF RE(UEST (TAC NOS.
H86194 AND M86195)
Your April 13, 1993, letter requested permanent relief for Diablo Canyon Power Plant, Units 1
and 2, from ASME Code Section III, Subsection NC-7142 stop valve control and interlock requirements.
You requested this relief because the positive displacement pump (PDP) relief valve discharge line block valve in both Units 1
and 2 does not have controls and interlocks.
ASHE Code Subsection NC-7142 requires controls and interlocks on stop valves when they are installed in relief valve piping.
We granted you interim relief in our April 15, 1993, letter.
You also responded to our request for additional information in your February 11, 1994, letter.
We grant relief from the ASME Section III, Subsection NC-7142 control and interlock requirements for PDP relief valve discharge line stop valves CVCS-1-831 and CVCS-2-831.
This allows you to use specific administrative controls on these block valves at Diablo Canyon instead.
We find that you have demonstrated that complying with Code requirements would result in hardship or unusual difficulty without a compensating increase in the level of quality and safety.
We also conclude that granting relief would not result in adverse safety consequences for accident scenarios associated with the installed block valve configuration.
The enclosed safety evaluation contains our review results.
Sincerely,
Enclosure:
Safety Evaluation cc w/enclosure:
See next page Theodore R. quay, Director Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation
Hr. Gregory H. Rueg'er 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.
Nancy Culver San Luis Obispo Hothers for Peace P. 0.
Box 164 Pismo Beach, California 93448 Hs. Jacquelyn C. Wheeler P. 0.
Box 164 Pismo Beach, California 93448 Hanaging Editor The Count Tele ram 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 Hr. Truman Burns Hr. Robert Kinosian California Public Utilities Commission 505 Van Ness, Room 4102 San Francisco, California 94102 Hr. Steve Hsu Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94234 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower
& Pavillion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Hr. Peter H. Kaufman Deputy Attorney General State of California 110 West A Street, Suite 700 San Diego, California 92101 Christopher J.
- Warner, Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Hr. John Townsend Vice President and Plant Hanager Diablo Canyon Power Plant P. 0.
Box 56 Avila Beach, California 93424 Diablo Canyon Independent Safety Committee ATTN:
Robert R. Wellington, Esq.
Legal Counsel 857 Cass Street, Suite D
Honterey, California 93940