ML19246B692
| ML19246B692 | |
| Person / Time | |
|---|---|
| Site: | Atlantic Nuclear Power Plant  |
| Issue date: | 06/27/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Collier A OFFSHORE POWER SYSTEMS (SUBS. OF WESTINGHOUSE ELECTRI |
| References | |
| NUDOCS 7907180343 | |
| Download: ML19246B692 (1) | |
Text
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UNITED ST ATES E
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- 1 NUCLE AR REGUL ATORY COMMISSION
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REGION 11 101 MARIE TT A ST. N W. SUIT E 3100
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JUN 2 7 mu In Reply Refer To:
RII:JPO 50-437 Offshore Power Systems Attn:
A. R. Collier, President P. O. Box 8000 Jacksonville, Florida 32211 Gentleten:
The enclosed Circular 79-11, is forwarded to you f o r in f e rr.a t ion.
So written to this Circular is required.
If you require additional inforcation respense regarding this subject, please contact this office.
Sincerely,
~ -
James P. O'Reilly Director
Enclosures:
1.
IE Circular 50. 79-11 2.
List of IE Circulars Issued in the Last 12 Months Ud 207180343 364 057
/
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 June 27, 1979 IE Circular No. 79-11 DESIGN / CONSTRUCTION INTERFACE PROBLEM Description of Circumstances:
(NSSS),
inadequate communication between nuclear steam supply system Apparent architect / engineer (A/E) and constructors have resulted in several cases where reactor vessels or the supports have been misoriented. The misorienta-sites where dual reactor units are being tion problems appear to occur at constructed and one primary system layout is a mirror image of the other.
2 reactor In 1975 TVA reported a misorientation problem with the Sequoyah Unit Westinghoase was the NSSS supplier and TVA provided their own A/E vessel.
s e rv ic e.
In 1977 the Southern California Edison Company reported a reactor vessel misorientation at San Onof re Unit 2.
Combustion Engineering was the NSSS supplier and Bechtel provided the A/E service.
1979 the Texas Utilities Generating Cc=pany reported a reactor vessel In support system misorientation at Comanche Peak Unit 2.
Westinghouse supplied the NSSS, Gibbs and Hill 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 t ype interface relation-of errors suggest s breakdowns in the design / construction ships t hat could in turn lead to more significant safety problems.
Corrective preventive action is recommended for the f ollowing reasons:
If the interface control system between the NSSS/AE/ Construction is marginal or ineffective as evidenced by the misorientation of reactor vessels and their supports, it is possible that other safety related In same cases the equipment may also be misoriented and/or mislocated.
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 a n d / o r s t W '~++--hew nA - < s3 4.,, _
operating parameters.
- IDUPLICATE DOCUMENT l
In translating NSSS design infor iEntire document previously entered the A/E may make changes to feci into system under:
plant. These translations may a ANO
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