ML20009D451
| ML20009D451 | |
| Person / Time | |
|---|---|
| Site: | Clinch River |
| Issue date: | 07/15/1981 |
| From: | Noles R BABCOCK & WILCOX CO. |
| To: | Stello V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-81-475-000 PT21-81-475, PT21-81-475-000, NUDOCS 8107240070 | |
| Download: ML20009D451 (5) | |
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{s G6O babcock &WilCOX po etcenerationcroup Carberton, Ohio 44203 Telephone: (216) 753-4511 fu/ $ b
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eY,ggl July 15, 1981 4
31Sg g b Mr. Victor Stello, Director g'
Office of Inspection and Enforcement United States Nuclear Regulatory Commission
/
D Washington, DC 20555 gq W '
Dear Mr. Stello:
Pursuant to the requirements of 10CFR21 this report, in three copies,
.is made concerning defects discovered in guide tube assemblies supplied by IAMCO Industries, El Cajon, California for use in the Ex-Vessel Storage
. Tank, Clinch River Breeder Reactor. The assemblies were shipped from IAMCO to Ishikawajima-Harima Heavy Industries Co. Ltd. (IHI), Yokohama, Japan, B&W's sublet fabricator.
Review of final radiographs of pressure boundary welds made by IR400 revealed five (5) welds that were not acceptable to ASME Code requirements. Attached is a listing with identification numbers of the guide tubes involved and the applicable drawings. There are a total of five (5) guide tubes in the system. The funt: tion of the guide tubes is to serve as sodium level indi-cators.
The cause of this concern is that the vendor provided a certified fabrication contalu ng a defect which could cause loss of system pressure if installed and operated. Corrective action consists of the following.
1.
B&W's evaluation of the IAMCO radiographs has been confirmed by
.re-radiograph of the rejected welds at IHI. This action was completed on July 13, 1;81. Three welds with less than 100% coverage were accepted; one weld with I.D. buildup was accepted; one weld, Mark 27-30 to Mark 27-32 on Guide Tube S/N 1683, initially judged to be a linear indication, ww rejected for incomplete fusion.
2.
Disposition f.nstructions to IHI will be provided to make the repair to the defective weld, or, alternatively, the assembly will be returned to LAMCO for repair. Repair is estimated to be complete by October 1,1981.
566 s
/ I
' 8107240070 810715
!0PDR ADOCK 05000537
/gh PDR The Babcock & Wilcox Company / Established 1867
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The Authorized Inspector at IHI, Yokohama, Japan and B&W's
-3 customer, Rockwell-Energy Systems Group, Ca.noga Park, California has been notified of this concern, 4.
B&W will present IAMCO with the radiographic results that verify the non-conforming conditions and request 'their corrective actions.
- s; Very truly yours, Y
Y:
R. B. Noles Manager, Quality Assurance Nuclear Equipment Division REN/dc.
cc:
E.~S. Gaffney Vice President and Plant Manager Nuclear Equipment Division
- Babcock' & Wilcox Company R. P. Wallace--
- Energy Systems Group Rockwell International Corporation 8900 Desoto Avenue Canoga Park, California 91304
.R. Zinns Authorized Nuclear Inspector
- No. 6-4, Yamate-Cho Naka-Ku, Yokohama Kanagawa Pref C31 Japan f
.u--
u.
4 GUIDE TUBE LISTING Serial Number B&W Initial Evaluation IHI Verification 1681 Less than 100% coverage Re-radiographed, acceptable, on weld 27-30 to 27-31 1682 Excess root reinforcement Re-radiographed, acceptable.
on weld 27-30 to 27-31 1683 Less than 100% coverage Re-radiographed, acceptable.
on weld 27-30 to 27-31 Linear indication located Re-radiographed and visually on centering of weld 27-30 inspected. Rejected for incomplete to 27-32 fusion on ID of weld 27-30 to 27-32.
1685 Less than 100% coverage Re-radiographed, acceptable on weld 27-30 to 27-31
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