ML19281A682
| ML19281A682 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 03/12/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Eric Turner HOUSTON LIGHTING & POWER CO. |
| References | |
| NUDOCS 7903300012 | |
| Download: ML19281A682 (1) | |
Text
R8 co, UNITED STATES o
f.'UCLEAR RECULATORY COMMISSION y
n REGION IV O.
2 611 RYAN PLAZA DRIVE, SUITE 1000 AR LINGTON, TEXAS 76011
\\
/
++***
March 12, 1979 In Reply Refer To:
RIV Docket Nos. 50-498/IE Bulletin No. 79-03 50-499/IE Bulletin No. 79-03 Houston Lighting & Power Company ATTN:
Mr. E. A. Turner, Vice President Power Plant Construction and Technical Services Post Office Box 1700 Houston, Texas 77001 Gentlemen:
Enclosed is IE Bulletin No. 79-03, which requires action by you with regard to your power reactor facilities with an operating license or a construction permit.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely,
']<t.f. ?
[
t Karl V. Seyfri Director
Enclosures:
1.
List of IE Bulletins Issued in Last Twelve Months 7903300012
UNITED SfATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-03 Date: March 12, 1979 Page 1 of 3 LONGITUDINAL WELD DEFECTS IN ASME SA-312 TYPE 304 STAINLESS STEEL PIPE SPOOLS MANUFACTURED BY YOUNGSTOWN WELDING AND ENGINEERING COMPANY Description of Circumstances:
On September 27, 1978, the Arizona Public Service Company reported that defects had been discovered in longitudinal welds in ASME Section III class 2 pipe supplied for the Palo Verde Nuclear Generating Station (PVNGS).
On November D,1978, the Southern California Edison Company reported similar defects in pipe supplied for the San Onofre Nuclear Generating Station, Units 2 and 3.
Pullman Power Products of Los Angeles, California supplies safety-related fabricated piping spools of various diameters for the PVNGS.
The defects were discovered by Pullman in ASME SA-312 type 304 stainless steel pipe supplied to Pullman by Youngstown Welding and Engineering Company of Youngstown, Ohio.
The pipe is manufactured by rolling plate into cylinders and then fusion welding the longitudinal seam without filler metal.
Pullman discovered defects in the longitudinal welds while rac'iographing their circumferential shop welds.
Further radiographic examination of the longitudinal welds revealed rejectable porosity and lack of fusion.
Pullman then performed ultrasonic examination of the full lergth of the longitudinal welds and discovered indications exceeding the acceptance criteria of ASME Section III.
Further ultrasonic examination revealed indications in other piping subassemblies where pipe was supplied by Youngstown.
Two indications verified by radiography were identified as porosity and measured 0.350 inch by 0.125 inch in one case and 0.300 inch by 0.125 inch in another case in pipe with a nominal wall thickness of 0.375 inch.
The additional examinations revealed that of 103 spools and four pipe supports shipped to PVNGS, 44 spools and one pipe support were found to contain ultrasonic indications exceeding tho',e permitted by the ASME Code.
Of 65 partially fabricated piping spools, 30 were found to be s'milarly defective.
The acceptance criteria for the pipe supplied by Youngstown includes 100 percent ultrasonic examination of the longitudinal 7903160138 N Pe