ML17083A358
| ML17083A358 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/23/1980 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Furbush M PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8006090150 | |
| Download: ML17083A358 (10) | |
Text
MAY 23 1880 Docket Nos.:
50-275 50-323 Nr. Malcolm H. Furbush Vice President - General Counsel Pacific Gas and Electric Company 77 Beale Street.
San Francisco.
California 94106 DISTRIBUTION:
Docket File NRC PDR Local PDR DEisenhut RPurple RTedesco ASchwencer BBuckley LB P3 File JLee RMattson SHanauer JKnight )lfil+gg WKreger MErnst RDenise ELD IE (3)
VMoore bcc:
Dear l1r. Furbush:
SUBJECT:
UNDERCLAD CRACKING IN REACTOR VESSEL NOZZLES-DIABLO CANYON UNITS 1 AND 2 Recently Sequoyah
- 1. Watts Bar 2, Salem 2 and Nor,th Anna 2 performed augmented ultrasonic inspections of their reactor vessel nozzles.
These examinations were conducted (1) to determine if underclad cracks,'esult-ing from certain pre-and post-clad heat treatments used by some European fabricators, were present in, the nozzles, and (2) to demonstrate that cladding heat treatments used in the United States did not result in the type of underclad cracks recently found by a European fabricator.
The results from the ultrasonic examinations, however, did not indicate an explicit correlation between observed cracking and pre-and post-clad heat tre~gt.
To better define the potential for cracking in reactor vessel
- nozzles, we request that you submit the following additional information in regard to the Diablo Canyon, Units 1 and 2 reactor vessels:
Nozzle base petal material specification type and grade. including material certification data of material used in construction.
Clad process type. electrode size and number of clad layers, ingluding material. certhflcatlon data of material used In construction.
Heat input (amps, volts. speed) for each clad layer.
Clad pre-f.;and post-heat temperature and interpass temperature for each clad layer.
Vessel stress relief treatment.
Manufacturer or subcontractor who fabricated vessel and applied OFFICE
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URNAME OATEP NRC FORM 318 (9 76) NRCM 0240 QU,S',GOVERNMENl PRINTING OFFICE >1979 299 369
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f1r. Malcolm H. Furbush x
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, <<MAY 3 3 1980 It is requested that you provide the requested information expeditiously in order to determine whether additional reactor vessel nozzle inspection is required.
Sincerely, ccs:
See next page
,A. Schwencer, Acting Chief Licensing Branch No.
3 Division of Licensing
, OFFICE SURNAME OATE$
. Mu&1ey.; y.b, 5(@@0 DL:L ASch
.neer NRC FORM 318 (9.76) NRCM 0240
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'U.S. GOVERNMENT PRINTING OFFICE! 1929 289-369
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'I I I
ct:
Philip A. Crane, Jr.,
Esq.
Pacific Gas 8 Electric Compan'y 77 Beale Street San Franc isco, Ca 1 iforni a '4106 Janice E. Kerr, Esq.
California Public Utilities Commission 350 McAllister Street San Francisco, California 94102 Hr. Frederick Eissler,'President Scenic Shoreline Preservation Conference, Inc.
4623 Hore Mesa Drive Santa Barbara, California 93105
'Hs. Elizabeth Apfelberg c/o Nancy Culver 192 Luneta San Luis Obispo, California 93401 Ms. Sandra A. Silver 1760 Alisal Street San Luis Obispo, California 93401 Mr. Gordon A. Silver 1760 Alisal,Street San Luis Obispo, California 93401 Yale I. Jones, Esq.
100 Van Ness Avenue - 19th Floor San Francisco, California 94102 Mr. Richard Mubbard HMB Technica'1 Associates Suite K
1723 Hamilton Avenue San Jose, California 95125
'r.
John Harrs, Hanaging Editor San Luis Obispo County Telegram-Tribune 1'321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406
Mr. Ha'lcolm H. Furbush CC:
Co
.To.lbert Young P. 0.
Box 219 Avi 1 a Beach, Ca 1 iforni a 93424 Elizabeth S.
Bowers, Esq.,
Chairman Atomic Safety
& Licensing'oard
. U. S. Nuclear Regulatory Commission Washington, D. C.
20555
'r. Glenn 0. Bright Atomic Safety 8 Licensing Board U. S. Nuclear Regulatory Commission Washington,.
D. C.
20555 Richard S. Salzman, Esq.,
Chairman Atomic Safety
& Licensing Appeal Board U. S. Nuclear Regulatory Commission-Washington, D. C.
20555 Dr.
W. Reed Johnson Atomic Safety 8 Licensing Appeal Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Alan S. Rosenthal, Esq.
Atomic Safety
& Licensing Appeal Board U. S. Nuclear Regulatory Coomission Washington, D. C.
20555 Ms. Raye Fleming 1920 Mattie Road Shell Beach, California 93440 Brent Rushforth, Esq.
Center for Law in the Public Interest
'0203 Santa Mon'ica Boulevard Los Angeles, California 90067 r
Arthur B. Gehr, Esq.
Snell
& Wilmer 3100 'Valley Center
-Phoenix, Arizona 85073 Mr.,James
- 0. Schuyler Nuclear Projects Engineer Pacific Gas
& Electric Company 77 Beale Street San Francisco, California 94106
0
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Yr. Malcolm H. Furbush cc:
Bruce Norton, Esq.
Suite 202 3216 North 3rd Street Phoenix, Arizona 85012 Hr.
W. C. Gangl.off Westinghouse Electric Corporation P. 0.
Box 355 Pittsburgh, Pennsylvania 15230 Michael R. Klein, Esq.
Wil'mer, Cutler 8 Pickering 1666 K. Street, N.
W.
Washington, D. C.
20006 David F. Fleischaker, Esq.
Su'ite 709 1735 Eye Street, N.
W.
Washington, D. C.
20006 Or. William E. Hartin Senior 'Ecologist Battelle Memorial Institute
- Columbus, Ohio 43201 W. Andrew Baldwin, Esq.
124 Spear Street San Francisco, California 94105 Resident Inspector/Diablo Canyon NPS c/o U. S.'uclear Regulatory Commission P. 0.
Box 219 Av'ila Beach, California 93424
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