ML19318B531
| ML19318B531 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/18/1980 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Crews E SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 8006270009 | |
| Download: ML19318B531 (3) | |
Text
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DISTRIBUTION:
JUN 181980 Docket Files bec:
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LB #3 Files DEisenhut l
RPurple Docket No.: 60-395 esco er THoughton JLee f:r. E. H. Crews, Jr.
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Vice President and Group Executive Engineering and Construction JKnight VMoore South Carolina Electric and Gas Con;pany P. O. Box 764 WXreger MErnst I
Colunibia, South Carolina 29281 L
ELD IE (3)
Cear fir. Crews:
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SUBJECT:
UNDERCLAD LRACKING IN ItEACTOR VLSSEL N0ZZLES -
i-(Virgil C. Suurer Nuclear Station, Unit No. I l
ic Recently Sequoyah 1, Watts Bar 2, Salem 2, and North Anna 2 performed augraented 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 so:re European i
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 l-treatment.
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To better define the potential for cracking in reactor vessel nozzles, we
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request that you submit the following additional information in regard to the Sunraer, Unit I reactor vessels:
Nozzle base nietal material specification type and grade, including material certification cata of material used in construction.
i-Clad process type, electrode size and nun.ber of clad layers, including n.aterial certification data of material used in construction.
lleat input (amps, volts, speed) for each clad layer.
Clad pre-and post-heat temperature and interrass temperature for each clad layer.
e i-Vessel stress relief treatment.
h Manufacturer or subcontractor who fabricated vessel and applied nozzle cladding.
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NRC FORM 3 3 8 (9-16) NRCM 0240 D U.S. GOVERNMENT PRIN TING OFFICE: 1979-289 369
2-JUN 181980 We request that you provide this information no later than two weeks after receipt of this letter.
Sincerely,
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A., Schw cer, Acting Chief Licensi g Branch No. 3 Division of Licensing cc: See next page t
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DL;LB..#3 DI.k#3 ASchwencer suRNwE).TCHoughton:mec onic),,6/,,/,],/80 6/,[k/80 C FORM 318 (9 76) NRCM 0240 DU.S. GOVERNMENT PRIN TING OFF;CE: 1979 289 369
cc:
Mr. H. T. Babb General Manager - Nuclear Operations
& System Planning South Carolina Electric & Gas Company P. O. Box 764 Columbia, South Carolina 29218 G. H. Fischer, Esq.
Vice President & Group Executive South Carolina Electric & Gas Company P. O. Box 764 Columbia, South Carolina 29218 Mr. William C. Mescher President & Chief Executive Officer South Carolina Public Service Authority 223 North Live Oak Dri Moncks Corner, South Carolina 29461 Mr. William A. Williams, Jr.
Vice President South Carolina Public Service Authority 223 North Live Oak Drive Moncks Corner, South Carolina 29461 i
Wallace S. Murphy, Esq., General Counsel South Carolina Public Service Authority 223 North Live Oak Drive Moncks Corner, South Carolina 29461 Troy B. Conner, Jr., Esq.
Conner, Moore & Corber 1747 Pennsylvania Avenue, N. W.
Washington, D. C.
20006 Mr. Mark B. Whitaker, Jr.
Manager - Nuclear Licensing South Carolina Electric & Gas Company P. O. Box 764 Columbia, South Carolina 29218 a
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