ML19326E164
| ML19326E164 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 07/17/1980 |
| From: | Youngblood B Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 8007280166 | |
| Download: ML19326E164 (3) | |
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UNITED STATES O 'i Th j,,fksD g
NUCLEAR REGULATORY COMMISSION
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WASHINGTON, D. C. 20555 Jm.17 180 Docket Nos.:
50-369 and 50-370 Duke Power Company ATTN: Mr. William 0. Parker, Jr.
Vice President - Steam Production P. O. Box 33189 422 South Church Street Charlotte, North Carolina 28242
Dear Mr. Parker:
SUBJECT:
UNDERCLA.D CRACKING IN REACTOR VESSEL NO ZLES (McGUIRE NUCLEAR STATION, UNITS 1 AND 2)
We have reviewed the information provided in your June 6,1980 letter regarding the reactor vessel nozzles at the McGuire Station.
We have determined that the McGuire Unit No. 2 reactor vessel was fabricated by Rotterdam Nuclear of the Netherlands using procedures for welding and pre-and post-clad heat treatments that increase the potential for underclad cracking.
For this reason, we require that augmented ultrasonic examination for under-clad cracking be performed on the McGuire Unit No. 2 reactor vessel nozzles prior to issuance of an operating license. The inspections should be conducted using techniques that have been designed to detect underclad cracks. These techniques previously have been used at Sequoyah 1, North Anna 2 and Salem 2.
The McGuire Unit No.1 vessel was fabricated by Combustion Engineering using welding heat treating practices expected not to cause underchd cracking. Therefore, we do not require that augmented preservice inspections be performed on the Unit No.1 vessel.
In the future augmented ultrasonic examination will be required for a reactor vessel whose nozzles were clad in the U.
S., but only as part of a program to verify that cladding heat treatments used by U. S. manufacturers do not result in underclad cracking.
Sincerely, 0
W.&cru hv-B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing ccs:
See next page i
8 0 0 7 2 80/6f,
g Mr. William 0. Parker, Jr.
s Vice President, Steam Production Duke Pcwer Company P. O. Box 2178 422 South Church Street l
Charlotte, Nor th Carolina 28242 cc:
Mr. W. L. Porter Duke Power Company David Flesichaker, Esq.
P. O. Box 2178 1735 Eye Street, N. W.
422 South Church Street Suite 709 Charlotte, North Carolina 28242 Washington, D. C.
20006 I
Mr. R. S. Howard Richard P. Wilson, Esq.
Power Systems Division Assistant Attorney General Westinghouse Electric Corporation State of South Carolina l
P. O. Box 355
?600 Bull Street Pittsburgh, Pennsylvania 15230 Columbia, South Carolina 29201 Mr. E. J. Keith i
EDS Nuclear Incorporated 220 Montgomery Street San Francisco, California 94104 Mr. J. E. Houghtaling NUS Corporation 2536 Countryside Boulevard Clear water, Flor ida 335i5 Mr. Jesse L. Riley, President The Carolina Environmental Study Group 854 Henley Place Charlotte, North Carolina 28207 J. Michael McGarry, !!!, Esq.
Debevoise A Liberman 1200 Seventeenth Street, N. W.
Washington, D. C.
20036 Rober t M. Lazo, Esq., Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 i
Dr. Emmeth A. Luebke L
Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Dr. Cadet H. Hand, Jr., Director Bodega Marine Lab of Califctnia P. O. Box 247 Bodega Bay, California 94923
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Mr. William O. Parker, Jr.
3.
1 cc: David Flesichaker, Esq.
1735 Eye Street, N. W.,
Suite 709 Washington, D. C.
20006 Rich 6rd P. Wilson, Esq.
Assistant Attorney General State of South Carolina 2600 Bull Street Columbia, South Carolina 29201 Office of Intergovernmental Relations 116 West Jones Street Raleigh, North Carolina 27603 County Manager of Mecklenburg County 720 East Fourth Street Charlotta, North Carolina 28202 U. S. Environmental Protection Agency ATTN: EIS Coordinator I
Region IV Office i
345 Courtland Street, N. W.
Atlanta, Georgia 30308 i
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