ML16342D052

Forwards Request for Addl Info Pertaining to Licensee Response to GL 95-03, Circumferential Cracking of SG Tubes

ML16342D052
Person / Time
Site:	Diablo Canyon
Issue date:	09/20/1995
From:	Stone J NRC (Affiliation Not Assigned)
To:	Rueger G PACIFIC GAS & ELECTRIC CO.
References
GL-95-03, GL-95-3, TAC-M92239, TAC-M92240, NUDOCS 9509220327
Download: ML16342D052 (8)

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555<001 September 20, 1995 Hr. Gregory M. Rueger Pacific Gas and Electric Company NPG Mail Code A10D P.O.

Box 770000 San Francisco, California 94177

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION GENERIC LETTER (GL) 95-03 DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1

AND 2 (TAC NOS.

H92239 AND H92240)

Dear Mr. Rueger:

By letter dated August 31, 1995, the NRC requested additional information pertaining to Pacific Gas and Electric Company's response to Generic Letter (GL) 95-03, "Circumferential Cracking of Steam Generator Tubes."

After further review, it has been determined that the following information, in addition to that requested in the August 31, 1995 letter, is needed.

We request that you respond to this request for additional information within 30 days of receipt of this letter.

During the Maine Yankee outage in July/August

1994, several weaknesses were identified in their eddy current program as detailed in NRC Information Notice (IN) 94-88, "Inservice Inspection Deficiencies Result in Severely Degraded Steam Generator Tubes." 'In IN 94-88, the staff observed that several circumferential indications could be traced back to earlier inspections when the data was reanalyzed using terrain plots.

These terrain plots had not been generated as part of the original field analysis for these tubes.

For the rotating pancake coil (RPC) examinations performed at your plant at locations susceptible to circumferential cracking during the previous inspection (i.e.,

previous ihspection per your Generic Letter 95-03 response),

discuss the extent to which terrain plots were used to analyze the eddy current data.

If terrain plots were not routinely used at locations susceptible to circumferential cracking, discuss whether or not the RPC eddy current data has been reanalyzed using terrain mappincf of the data.

If terrain plots were not routinely used during the outage and your data has not been reanalyzed with terrain mapping of the data, discuss your basis for not reanalyzing your previous RPC data in light of the findings at Maine Yankee.

Discuss whether terrain plots will be used to analyze the RPC eddy current data at locations susceptible to circumferential cracking during your next steam generator tube inspection (i.e., the next inspection per your Generic Letter 95-03 response).

9509220327 950920 POR ADOCX 050002>S P

PDR

Hr. Gregory H. Rueger September 20, i995 This request is within the original reporting burden for information collection of 350 hours0.00405 days <br />0.0972 hours <br />5.787037e-4 weeks <br />1.33175e-4 months <br /> covered by the Office of Management and Budget clearance number 3150-0011, which expires July 31, 1997.

If you have any questions, please contact me at (301) 415-3063.

Sincerely, Original signed by:

James C. Stone, Senior 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 DISTRIBUTION:

Docket File PUBLIC JRoe EGAl WBateman KThomas JStone DMcDonald ACRS (4),

TWFN PDIV-2 Reading

OGC, 015B18

KPerkins, RIV/WCFO

JDyer, RIV DChamberlain, RIV EPeyton KKarwoski, EMCB DOCUMENT NAME:

DC92239.RAI PDIV-2 P

JStone 9

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/95 NAME ey on DATE 9~95 OFFICIAL RECORD COPY OFC PDIV-2 LA PDIV-2/PH

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Hr. Gregory H. Rueger September 20, 1995 This request is within the original reporting burden for information collection of 350 hours0.00405 days <br />0.0972 hours <br />5.787037e-4 weeks <br />1.33175e-4 months <br /> covered by the Office of Hanagement and Budget clear ance number 3150-0011, which expires July 31, 1997.

If you have any questions, please contact me at (301) 415-3063.

Sincerely, Original signed by:

James C. Stone, Senior 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 DISTRIBUTION:

Docket File PUBLIC JRoe EGA1 WBateman KThomas JStone DMcDonald ACRS (4),

TWFN PDIV-2 Reading

OGC, 015B18

KPerkins, RIV/WCFO

JDyer, RIV DChamberlain, RIV EPeyton KKarwoski, EHCB DOCUMENT NAME:

DC92239.RAI OFC PDIV-2 LA PDIV-2 PM PDIV-2 P

NAME DATE ey on 9~95 KThemaV:ye JStone 9i 95 9

95 OFFICIAL RECORD COPY

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Mr. Gregory M. Rueger 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 1100 11th Street, Suite 311 Sacramento, California 95814 Ms. Nancy Culver San Luis Obispo Mothers for Peace P. 0.

Box 164 Pismo Beach, California 93448 Ms. Jacquelyn C. Wheeler P. 0.

Box 164 Pismo Beach, California 93448 Managing 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 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 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower

& Pavillion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Mr. 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 Mr. Warren H. Fujimoto Vice President and Plant Manager Diablo Canyon Nuclear 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

Monterey, California 93940

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