ML16342D658
| ML16342D658 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/16/1997 |
| From: | Steven Bloom NRC (Affiliation Not Assigned) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| GL-95-03, GL-95-3, TAC-M92239, TAC-M92240, NUDOCS 9705230333 | |
| Download: ML16342D658 (8) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON> O.C. 2055&4001 May 16, 1997 Mr. Gregory M. Rueger Pacific Gas and Electric Company NPG - Mail Code AlOD P. 0.
Box 770000 San Francisco, California 94177
SUBJECT:
COMPLETION OF LICENSING ACTION FOR GENERIC LETTER 95-03, "CIRCUMFERENTIAL CRACKING OF STEAM GENERATOR TUBES,"
DATED APRIL 28,
- 1995, FOR DIABLO CANYON NUCLEAR POWER PLANT, UNIT NOS.
1 AND 2 (TAC NOS.
M92239 AND M92240)
Dear Mr. Rueger:
On April 28,
- 1995, the U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 95-03, "Circumferential Cracking of Steam Generator Tubes," to all holders of operating licenses or construction permits for pressurized-water reactors.
The NRC issued GL 95-03 for three principal reasons:
(1)
Notify addressees about the safety significance of the recent steam generator tube inspection findings at Maine Yankee Atomic Power Station.
(2)
Request that all addressees implement the actions described within the generic letter.
(3)
Require that all addressees submit to the NRC a written response regarding implementation of the requested actions.
In addition, GL 95-03 alerted addressees to the importance of performing comprehensive examinations of steam generator tubes using techniques and equipment capable of reliably detecting the types of degradation to'hich the steam generator tubes may be susceptible.
The staff also noted that the performance of steam generator tube examinations is controlled, in part, by Appendix B to Title 10, Part 50, of the Code of Federal Regulations (10 CFR Part 50).
In GL 95-03, the NRC staff also requested that licensees take the following actions:
(I)
Evaluate recent operating experience with respect to the detection and sizing of circumferential indications to determine the applicability to their plants.
(2)
On the basis of the evaluation in Item (1) above, as well as past inspection scope and results, susceptibility to circumferential cracking, threshold of detection, expected or inferred crack growth
- rates, and other relevant factors, develop a safety assessment justifying continued operation until the next scheduled steam generator tube inspections.
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Mr. Gregory M. Rueger May 16, 1997 (3)
Develop plans for the next steam generator tube inspections as they pertain to the detection of circumferential cracking.
The inspection plans should address, but not be limited to, scope (including sample, expansion criteria, if applicable),
metho'ds, equipment, and criteria (including personnel training and qualification).
To document the outcome of these actions, the NRC staff requested that addressees prepare and submit the following:
(1)
A safety assessment justifying continued operation, predicated on the evaluation performed in accordance with requested actions 1
and 2
(above).
(2)
A summary of the inspection plans developed in accordance with requested
=
action 3 (above) and a schedule for the next planned inspection.
In response to GL 95-03, Pacific Gas
& Electric Company provided letters dated June 29, October 2,
and November 28, 1995 for Diablo Canyon Nuclear Power Plant, Unit Nos.
1 and 2.
These submittals provided the information requested by GL 95-03; therefore TAC Nos.
M92239 and M92240 are closed.
For your information, the staff's findings regarding this issue are contained in NUREG-1604, "Circumferential Cracking of Steam Generator Tubes."
If,you have any questions, please contact me at (301) 415-1313.
Sincerely, Original Signed By Steven D. Bloom, Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos'.
50-275 and 50-323 cc:
See next page 1
DOCUMENT NAME:
DC92239.LTR, DISTRIBUTION:
Docket File PUBLIC PDIV-2 JRoe EAdensam WBateman
,SBloom EPeyton ACRS
- OGC, 015B18 KPer kins, RIV/WCFO
97 PDIV-2 LA EPeyt n
5 497" OF ICIAL RECORD COPY
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Mr. Gregory M. Rueger May 16, 1997 (3)
Develop plans for the next steam generator tube inspections as they pertain to the detection of circumferential cracking.
The inspection plans should address, but not be limited to, scope (including sample expansion criteria, if applicable),
- methods, equipment, and criteria (including personnel training and qualification).
To document the outcome of these actions, the NRC staff requested that addressees prepare and submit the following:
(1)
A safety assessment justifying continued operation, predicated on the evaluation performed in accordance with requested actions 1 and 2
(above).
(2)
A summary of the inspection plans developed in accordance with requested action 3 (above) and a schedule for the next planned inspection.
In response to GL 95-03, Pacific Gas 8 Electric Company provided letters dated June 29, October 2, and November 28, 1995 for Diablo Canyon Nuclear Power Plant, Unit Nos.
1 and 2.
These submittals provided the information requested by GL 95-03; therefore TAC Nos.
M92239 and M92240 are closed.
For your information, the staff's findings regarding this issue are contained in NUREG-1604, "Circumferential Cracking of Steam Generator Tubes."
If you have any questions, please contact me at (301) 415-1313.
Sincerely, Q
Steven D. Bloom, Project Manager Project Directorate 'IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos.
50-275 and 50-323 cc:
See next page
p Mr. Gregory M. Rueger N
May 16, 1997 CC:
NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Bea h, California 93424 Dr. Richard Ferguson, Energy Chair Sierra Club California 1100 11th Street, Suite 311 Sacramento, California 95814 Ms. Nancy Culver
'an Luis Obispo Mothers for Peace P. 0.
Box 164 Pismo Beach, California 93448 Chairman San Luis Obispo County Board of
'Supervisors Room 370 County Government Center San Luis Obispo, California 93408
. Mr. Truman Burns Mr. Robert Kinosian California Public Utilities Commission 505 Van Ness, Room 4102 San Francisco, California 94102 Mr. Steve Hsu Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94232 Diablo Canyon Independent Safety Committee ATTN:
Robert R. Wellington, Esq.
Legal Counsel 857 Cass Street, Suite D
Monterey, California 93940 N
Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower
& Pavillion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Christopher J.
- Warner, Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Fr anci sco, Cal iforni a 94120 Mr. Robert P.
Powers Vice President and Plant Manager Diablo Canyon Nuclear Power Plant P. 0.
Box 56 Avila Beach, California 93424 Telegram-Tribune ATTN:
Managing Editor.
1321 Johnson Avenue P.O.
Box 112 San Luis Obispo, California 93406
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