ML19261E254
| ML19261E254 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 06/27/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Hines E DETROIT EDISON CO. |
| References | |
| NUDOCS 7907050473 | |
| Download: ML19261E254 (1) | |
Text
[pa aseg#'o UNITED STATES 5 - k 'h_ [ 'n 8 \\*
NUCLEAR REGULATORY COMMISSION gi REGION lli
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g 799 ROOSEVELT ROAD Q,%
Sq ' %, ' j GLEN ELLYN, ILLINOls 60137 i
JUN 2 71979 Docket No. 50-341 The Detroit Edison Company ATTN:
Mr. Edward Hines, Assistant Vice President and Manager Quality Assurance 2000 Second Avenue Detroit, MI 48226 Gentlemen:
The enclosed Circular No. 79-11, is forwarded to you for information.
No written response to this Circular is required.
If you require additional information regarding this subject, please contact this office.
Sincerely,
. cc s'tJames G. Keppler i
Director
Enclosure:
IE Circular No. 79-11 cc w/ encl:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Eugene B. Thomas, Jr.,
Attorney
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! l-j 7W 0so 473 g 7
U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III June 27, 1979 IE Circular No. 79-11 DESIGN / CONSTRUCTION INTERFACE PROBLEM Description of Circumstances:
Apparent inadequate co==unication between nuclear steam supply system (NSSS),
architect / engineer (A/E) and constructors have resulted in several cases where reactor vessels or the supports have been misoriented.
The misorienta-tion problems appear to occur at cites where dual reactor units are being constructed and one primary system layout is a mirror image of the other.
In 1975 TVA reported a misorientation problem with the Sequoys.h Unit 2 reactor vessel.
Westinghouse was the NSSS supplier and TVA provided t heir own A/E service.
In 1977 the Southern Calif ornic Edison Company reported a reactor vessel misorientation at San Onofre Unit 2.
Combustion Engineering was the NSSS supplier and Bechtel provided the A/E service.
In 1979 the Texas Utilities Generating Company reported a reactor vessel support system misorientation at Comanche Peak Unit 2.
Westinghouse supplied the NSSS, Gibbs a:
lill was the plant engineer and Brown and Root was the constructor.
Even though there appears to be minimal safety implications associated with the particular misorientation problems mentioned, repetition of the same type of errors suggests breakdowns in the design / construction interface relation-ships that could in turn lead to more significant safety prcblems.
Corrective preventive action is recom= ended for the following reasons:
If the interface control system between the NSSS/AE/ Construction is marginal or ineffective as evideuced by the misorientation of reactor vessels and their supports, it is possible that other safety related equipment may also be misoriented and/or mislocated.
In some cases the errors may not be as obvious as a misoriented reactor vessel.
This type of error can and has resulted in hardware modifications and could cause functional and/or structural changes that affect design and operating parameters.
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In translating NSSS design info the A/E may make changes to faci DUPLICATE DOCUMENT plant.
These translations may a Entire document previously entered 9 c4 O O l}
into system under:
G200 J 76 ANO No. of pages:
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