ML19225A076
| ML19225A076 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 06/27/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Weigand J GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 7907180249 | |
| Download: ML19225A076 (1) | |
Text
A k k' g>R REGO
'o UNITED STATES
'81;N,.c, '7 o NUCLEAR REGULATORY COMMISSION
$/
REGION IV 0,
55.
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611 RYAN PLAZA DRIVE, SulTE 1000
%,, ' '.'.'.,8 AR LINGTON, T EXAS. 5012
+.
June 27, 1979 In Reply Refer To:
R1V Docket Nos.
50-458/IE Circular No. 79-11 50-459/IE Circular No. 79-11 Gulf States Utilities Attn:
Dr. J. G. Weigand General Manager, Nuclear Projects Post Office Box 2951 P>e aumon t, Texas 77704 Gentlemen:
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,
,(;
^
/ k/ 1'Q, Karl V. Seyf t Director
Enclosures:
1.
IE Circular No. 79-11 2.
List af IE Circulars Issued in the Ia.st 12 Months 7907380 2 4]
3 /p) 079
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Circular No. 79-11 Date: June 27, 1979 Page 1 of 2 DESIGN / CONSTRUCTION INTERFACE PROBLEM Description of Circumstances:
Apparent inadequate communication 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 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 misorientation 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 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, rapetition 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 be_ ween the NSSG/AE/ Construction is marginai 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
'ted in hardware modifications and DU
"'m that affect design and could cause functional operating parameters.
In translating NSSS dq Int docume t pr y O s,
8YStem under. e
'Jsly ent'EGd the A/E may make chan?
lj plant. These transla ANO l O Wh 3/9 0R1 No,,f 7906200176 h U i .}}