ML19225A079
| ML19225A079 | |
| Person / Time | |
|---|---|
| Site: | Allens Creek File:Houston Lighting and Power Company icon.png |
| Issue date: | 06/27/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Eric Turner HOUSTON LIGHTING & POWER CO. |
| References | |
| NUDOCS 7907180255 | |
| Download: ML19225A079 (1) | |
Text
[~.C 9** * * %q'o, ypl UNITED STATES "3
3.,yk, f,-.j, pf j NUCLEAR REG';LATORY COMMISSION E-
..,.,+y..,
~
- k REGION IV
/.. [c o, '(5A5h>d/',
611 RYAN PLAZA DRIVE, SUITE 1000 i,"
/
ARLINGTON, TE X AS 76012 June 27, 1979 In Reply "efer To:
RIV Docket No. 50-466/IE Circular No. 79-11 Houston Lighting and Power Company ATTN:
Mr. E. A. Turner, Vice President Power Plant Construction and Technical Services Post Office Box 1700 Houston, Texas 77001 Gentlemen:
The enclosed Circular 79-11, is forwarded to you for inforu tion.
No written response to this Circular is required.
If you require additional inforcation regarding this subject, please contace this office.
Sincerely,
/ ')
Lj ()
,J Jarl V. Seyfrit
' Director
Enclosures:
1.
IE Circular No. 79-11 2.
List of IE Circulars Issued in the Last 12 Months 7007180 15 F 49 Ob4
~
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, 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 tollowing reasons:
If the interface control system between the NSSS/AE/ Construction is marginal or ineffective as evidenced by the misorient ition 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 erro m y - C y - ~ u " gr- ' 7--
.,s w. -.'
could cause funct
~ ^ -
- and
~En and operating parametH DUPLICATE DOCUMENT 4
In translating NSI} Entire document previously entered
, j :uments '
the A/E may make q.into system under:
i':e of plant.
These tra
,t be q
r
~
b No. of pages:
"i
}[p )
U,aOJ l
e
.~-
~
-