ML13302A365
| ML13302A365 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/24/1980 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Dietch R, Gilman B SAN DIEGO GAS & ELECTRIC CO., SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 8007020673 | |
| Download: ML13302A365 (4) | |
Text
DISTRIBUTION:
JUN 2 4 1980 DocketEies RMattson bcc: TUS NRC PDR SHanauer ACRS (16)
Local PDR JKnight LB #3 Files VMoore DEisenhut WKreger RPurple MErnst Docket Nos.: 50-360362 RTedesco ELD ASchwencer IE (3)
HRood JLee bcc: NSIC Mr. Robert Dietch Mr. B. W. Gilman Vice President Senior Vice President - Operations Southern California Edison Company San Diego Gas & Electric Company 2244 Walnut Grove Avenue 101 Ash Street P. 0. Box 800 P. 0. Box 1831 Rosemead, California 91770 San Diego, California 92112 Gentlemen:
SUBJECT:
UNDERCLAD CRACKING IN REACTOR VESSEL NOZZLES (San Onofre Nuclear Generating Station, Units 2 and 3)
Recently Sequoyah 1, Watts Bar 2, Salem 2, and North Anna 2 performed augmented ultrasonic inspections of their reactor vessel nozzles. These examinations were conducted (1) to determine if underclad cracks, resulting 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 treatment.
To better define the potential for cracking in reactor vessel nozzles, we request that you submit the following additional information in regard to the San.Onofre, Units 2 and 3 reactor vessels:
Nozzle base metal material specification type and grade, including material certification data of material used in construction.
Clad process type, electrode size and number of clad layers, including material certification data of material used in construction.
Heat input (amps, volts, speed) for each clad layer.
Clad pre-and post-heat temperature and interpass temperature for each clad layer.
Vessel stress relief treatment.
A l Manufacturer or subcontractor who fabricated vessel and applied 3
nozzle claddin.
O F F IC E S U R N A M E DATE
- 1.
NRC FORM 318 (9-76 NRCM 0240
'U.S.
GOVERNMENT PRINTING OFFICE: 1979-289-369 JUN 24 1980 Ve request that you provide this information no later than two weeks after receipt of this letter.
Sincerely, A. Schwencer, Acting Chief Licensing Branch No. 3 Division of Licensing cc: See next page DL:LB #3 DL:LB #3 O F F IC E SR MEH!oodmec A~bhwne S U R N A M E ATE 6/
/80 6/
/80 NRC FORM 318 (9-7.6) NRCM 0240 U.S. GOVERNMENT PRINTING OFFICE: 1979-289-369
cc:
Charles R. Kocher, Esq.
James A. Beoletto, Esq.
Southern California Edison Company 2244 Walnut Grove Avenue P. 0. Box 800 Rosemead, California 91770 Chickering & Gregory ATTN:
David R. Pigott, Esq.
Counsel for San Diego Gas & Electric Company Southern California Edison Company 3 Embarcadero Center -
23rd Floor San Francisco, California 94112 Mr. Kenneth E. Carr City Manager City of San Clemente 100 Avenido Presidio San Clemente, California 92672 Alan R. Watts, Esq.
Rourke & Woodruff Suite 1020 1055 North Main Street Santa Ana, California 92701 Lawrence Q. Garcia, Esq.
California Public Utilities Commission 5066 State Building San Francisco, California 94102 Mr. R. W. DeVane, Jr.
Combustion Engineering, Incorporated, 1000 Prospect Hill Road Windsor, Connecticut 06095
Pr.
Robert Dietch 2
r-. B. W. Gilman cc:
Mr. P. Dracolovich Bechtel Power Corporation P. 0. Box 60860, Terminal Annex Los Angeles, California 90060 Mr. Mark Medford Southern California Edison Company 2244 Walnut Grove Avenue P. 0. Box 800 Rosemead, California 91770 Henry Peters San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Ms. Lyn Harris Hicks Advocate for GUARD 3908 Calle Ariana San Clemente, California 92672 Richard J. Wharton, Esq.
Wharton & Pogalies Suite 106 2667 Camino Del Rio South San Diego, California 92108 Phyllis M. Gallagher, Esq.
Suite 222 1695 West Crescent Avenue Anaheim, California 92701 Mr. A. S. Carstens 2071 Caminito Circulo Norte Mt. La Jolla, California 92037 Resident Inspector, San Onofre/NPS*
c/o U. S. Nuclear Regulatory Commission P. 0. Box AA Oceanside, California 92054