ML19225A097
| ML19225A097 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/27/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7907180318 | |
| Download: ML19225A097 (2) | |
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'o, UNITED STATES
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'c NUCLE AR REGULATORY COMMISSION I
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101 M ARIE TT A ST, N W, SUITE 3100
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ATL ANT A. GEORGI A 30303
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JUN ? 71979 In Reply Refer To:
RII:JPO 50-395 lout
' cJ.na Electric and Gas Company Attn:
St. C. Jchason, Vice President
.,getial Services and Purchasing Post Office Box 764 Columbia, South Carolina 29218 Gentle =en:
The enclosed Circular 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, Janes P. O'Reilly Director
Enclosures:
1.
IE Circular No. 79-11 2.
List of IE Circulars Issued in the Last 12 Months
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'120 226 7007180 5/8
South Carolina Electric and Gas Company cc w/ encl:
T. B. Conners, Jr.
Conners, Moore and Cerber 1747 Pennsylvania Avenue, N.W.
Washington, D.C.
20000 A. A. Sc:th Quality Assurance Pos. Office Box 8 Jeakinsville, South Carolina 29Ci's
- 0. S. Bradham, Manager Nuclear Operattens Post Office Bcx 8 Jenkinsv211 Scutn Ca:c.1:na 2936')
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UNITED STATES NUCLEAR REGULATORf COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHIh0 TON, D.C.
20555 June 27, 1979 IE Circular No. 79-11 DESIGN / CONSTRUCTION INTERFACE PROBLEM Description of Circumstances:
Apparent inadequate coc:munication between nuclear steam supply system (NSSS),
architect / engineer (A/E) and constructors have resulted in several cases whe re reactor vessels or the support s Fave been misoriented.
The misorienta-tion problems appear to occur at sites where dual reactor units are being constructed and one primary system layout is a mirror image of the other.
In 1975 TVA reported a misorientetion problem with the Sequoyah Unit 2 reactor vessel.
Westinghouse was the NSSS supplier and TVA provided their own A/E service.
In 1977 the Southern California 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 misorienta*. ion 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 type of errors suggests breakdowns in the design / construction interface relation-ships that could in turn lead to more significant safety problems.
Corrective preventive action is recommended for the following reasons:
If the interface control system between the NSSS/AE/Constructicn is marginal or ineffective as evidenced by the misorientation of reactor vessels and their supports, it is possible that other safety related
' also be misoriented and/or mislocated.
In sorse cases the equipment may errors may not be as obvious as a misoriented t
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