ML19261E277
| ML19261E277 | |
| Person / Time | |
|---|---|
| Site: | Columbia, Washington Public Power Supply System, Satsop  |
| Issue date: | 06/27/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Strand N WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| NUDOCS 7907050497 | |
| Download: ML19261E277 (1) | |
Text
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UNIT ED STATES 1
E' NUCLEAR REGU_ATORY COMMISSION
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SUITE 20?, WALNUT CREEK PLAZ A
-e WALNUT CREEK, CAllFORN:A 94596 June 27, 1979 Docket tios.
50-397 50-460 50-513 50-508 50-509 Washington Public Power Supply System P. O. Box 958 3000 George Washington Way Richland, Washington 99352 Attention: ?!r. ti. O. Strand Managing Director Gentlemen:
The enclosed IE Circular tio. 79-11, is forwarded to you for information.
tio written response to this Circular is required.
If you require additional information regarding this subject, please contact this office.
Sincerely, (ih LN y
R. H. Engelken Director
Enclosures:
1.
IE Circular t'o. 79-11 2.
List of IE Circulars Issued in the Last 12 Months cc w/ encl:
A. D. Kohler, WPPSS G. C. Sorensen, WPPSS J. P. Thomas, WPPSS W. J. Talbott, WPPSS M. E. Witherspoon, WPPSS pga uo o r sog7 C
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF If;SPECTION AND ENE0RCEMEflT WASHINGTON, D.C.
20555 June 27, 1979 IE Circular No. 79-11 DESIGN / CONSTRUCTION IflTERFACE PROBLEM Description of Circumstances:
Apparent inadequate communication between nuclear steam supply system (flSSS),
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 nisorientation problem with the Sequoyah Unit 2 reactor vessel. Westinghouse was the NSSS supplier and TVA provided their own A/E se rvice.
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 Ccmpany reported a reactor vessel support system misorientation at Comanche Peak Unit 2.
Westinghouse supplied the flSSS, 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 probiens rentioned, 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 recormended for the following reasons:
If the interface control system between the NSSS/AE/ Construction is narginal or ineffective as evidenced by the nisorientation of reactor vessels and their supports, it is possible that other safety related equipment may also be nisoriented and/or mislocated.
In sone cases tha 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.
In translating NSSS design infon the A/E may nake changes to faci Entire document previously entered plant. These translations may a into system under:
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ANO 2
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