ML13316B732
| ML13316B732 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/30/1980 |
| From: | Ottoson H SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-79-03A, IEB-79-3A, NUDOCS 8007250358 | |
| Download: ML13316B732 (2) | |
Text
Southern California Edison Company P.O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 June 30, 1980 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V Suite 202, Walnut Creek Plaza 1990 North California Boulevard Walnut Creek, California 94596 Attention:
Mr. R. H. Engelken, Director DOCKET NO. 50-206 SAN ONOFRE UNIT 1
Dear Sir:
I. E. Bulletin 79-03A, Longitudinal Weld Defects in ASME SA-312, Type 304 Stainless Steel Pipe Reference is made to-your correspondence of April 4, 1980, forwarding the subject IE Bulletin. Identified therein were potential problems associated with lack of weld penetration in seamed stainless steel pipe, Material Specification SA-312 or A-312, Type 300 Series.
Responses to individual items are listed below in the order given in the Bulletin:
Item 1:
Determine whether SA-312 or A-312, Type 300 Series fusion welded pipe is in use or planned for use in safety-related systems subject to design stresses greater than 85% of the Code allowable stresses.
For the purpose of this check, the actual wall thickness of the piping products will be considered adequate if the Code require ments for pressure design of the piping products are satisfied using 85% of the maximum allowable stress at the design temperature.
Response
The use of SA-312 or A-312, Type 300 Series fusion welded pipe in safety related applications at San Onofre Unit 1 has been reviewed. This review has been made irrespective of the piping manufacturer and is based upon minimum wall thickness, design pressures and temperatures and use of 85% of the maximum allowable stress of the material. No piping system was identified that exceeds the criteria given above.
80O725o35' c-
U. S. Nuclear Regulatory Commission IE Bulletin 79-03A Page 2 Item 2:
For those piping components using greater than 85% of the allowable stresses, identify the application of the piping including the system, pipe location, pipe size, pipe configuration (elbow, tee),
design pressure/temperature requirements and the manufacturer.
Response
As noted in our response to. Item 1 above, this condition is not found at San Onofre Unit 1.
Item 3:
For those facilities under construction and where access permits, the ends of all safety-related SA-312 and A-312 fusion welds should be etched to determine if CLP exists.
Identify the manufacturer and the degree of CLP as a percentage of the pipe wall thickness.
Response
Not applicable to San Onofre Unit 1.
Item 4:
For facilities with an operating license, a report of the above information shall be submitted within 120 days of receipt of this Bulletin.
Response
This letter constitutes our response to this item.
Item 5:
For facilities with a construction permit, a report of the above information shall be submitted within 120 days of receipt of this Bulletin.
Response
Not applicable to San Onofre Unit 1.
Should you have any further questions on this matter, please call me.
Sincerely, H. L. Ottoson Manager of Nuclear Operations cc:
Director, Office of Inspection and Enforcement, Division of Reactor Cperations Inspection