ML19225A094
| ML19225A094 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 06/27/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stampley N MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 7907180315 | |
| Download: ML19225A094 (2) | |
Text
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'c UNITED ST ATES
't NUCLE AR REGUL ATORY COMMISSION 8Yh 5
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'g JUN 2 71979 In Reply Refer To:
RII:JPO 50-416, 50-417 Mississippi Power and Light Company Attn:
N. L. Stacpley Vice President of Production P. O. Box 1640 Jar.kson, Mississippi 39205 Gentleten:
The enclosed Circular 79-11, is forwarded to you for information.
No n itten response to this Circular is required.
If you require additional information regarding this subject, please contact this office.
Sincerely,
~. _. _ _ _.
James P. O'RefIly Director
Enclosures:
1.
IE Circular 50. 79-11 2.
List of IE Circulars issued in the Last 12 Months 420 9,
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Mississippi Power and Light Ccepany ec w/ encl:
C. K. McCoy Plant Manager Post Office Box 756 Port Gibson, Mississippi 39150 i
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UNITED STATES NUCLEAR REGUI.ATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
iC555 June 27, 1979 IE Circular No. 79-11 DESIGN /CONSTRUCI ON INTERFACE PROBLEM Description of Circumstances:
Apparent inadequate communication between nitclear steam supply system (NS35),
architect / engineer ( A/E) and cc nstructors have resulted in several ca*.es where reactor vessels or the supports have been misoriented.
The misorienta-tien problees appear to occur at sites where dual reactor units are ceing const ructed and one primary system layout is a mirror image of the other.
In 1975 TVA reported a miserientation problem with the Sequoyah Unit 2 reactor vessel. Westinghouse was the NSSS supplier and ITA provided their own /./E service.
In 1977 the Southern California Edison Company reported a reactor vessel misorientarton at San Onofre Unit 2.
Combustion Engineering was the NSSS supplier a c:htel 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 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 miserientation problems mentioned, repetition of the same type of errors suggest s breakdowns in the design / construction interface celation-ship s that could in turn lead to more significant safety prcblems.
Corrective preventive action is recommended for the following 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 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 b
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