ML19332A653
| ML19332A653 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 08/08/1980 |
| From: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-79-03A, IEB-79-3A, NUDOCS 8009160620 | |
| Download: ML19332A653 (2) | |
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j Cues cecount Awax:t '.W P<ement August 8, 1980 Trojan Nuclear Plant Docket 50-344 DlTE!C D6hT ROOM Mr. R.. H. Engeklen, Director U. S. Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 N. California Blvd.
Walnut Creek, CA 94596 v
Dear Mr. Engelken:
Your~ letter of April 4, 1980 issued IE Bulletin 79-03A which superseded the previous.IE Bulletin 79-03 regarding longitudinal weld defects in ASME SA-312, Type 304 stainless steel pipe. PGE provides the following information in response to the subject Bulletin:
Items 1 and 2 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 percent of the Code allowable stresses.
For the purpose of this check, the actual weld thickness of the piping products will be considered adaquate if the codt rcquirements for pres-sure design of the piping products are satisfied using 85 percent of the maximum allowable stress of the design temperature.
S r those piping compcnents using greater than 85 percent of the allow-able stresses, identify the application of the piping including the sys-tem, pipe location, pipe size, pipe configuration (elbow, tee), design pressure / temperature requirements and the mancfacturer.
Response
' Trojan utilizes SA-312 and A-312, type 300 series welded pipes manufac-tured by SWEPCO in safety related systems.
In response to the concerns identified in the Bulletin, all stainless steel piping, except those 8009160 h O p
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Ferdand General EechicCcmpany Mr. R. H. Engelken August 8, 1980 Page 2 under the USSS vendor's scope of responsibility (e.g., CVCS, RCS, SIS, RHR and CCW, etc.), which utilizes the rolled and welded fabrication method without filler metal, was analytically reviewed for adequate wall thickness. The pipe wall thicknesses were calculated using a conservative weld joint efficiency factor of.85 rather than 1.0 which is the Code allowable value.
The results of this review have determined that the wall thicknesses of these pipes were greater than the rainimum values specified in the Trojan piping specifications and that none of these pipes were subject to design stress greater than 85 percent of the Code allowable stresses.
An investigation of the piping systems within the NSSS vendor's scope of responsibility is in progress but would not be available until the end of December 1980.
We will provide this information as soon as it becomes available.
Sincerely, A) 0
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C. Goodwin, Jr.
Assistant Vice President Thermal Plant Operation and Maintenance CG/KM/4sa3A7 c:
Mr. Lynn Frank, Director State of Oregon Department of Energy Director Office of Inspection and Enforcement U. 3. Nuclear Regulatory Commission t