ML19321A492
| ML19321A492 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 07/14/1980 |
| From: | Koch L ILLINOIS POWER CO. |
| To: | |
| References | |
| U-1056, NUDOCS 8007230518 | |
| Download: ML19321A492 (2) | |
Text
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U-0156 f
Ll4-80(07-14)-9 ILLINOIS POWER COMPANY
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4 50] SOUTH 27TH STREET. DECATUR. ILLINotS 62525 July 14, 1980 Mr. James G. Keppler Director, Region III Office of Inspection and Enforcement
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U.S. Nuclear Regulatory Commission i
.799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Kecc.ler:
Clinton Power Station Unit 1
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Docket No. 50-451 Construction Permit No. CPPR-137 On June 20, 1980, Illinois Power Co=pany verbally notified Mr. John Neisler, NRC Region III, cf a potential reportable deficiency per 10CFR50.55(e).
We had-identified at that time a suspected noncon-forming elbow installed in the two-inch drain line from the reactor pressure vessel (RPV) for Clinton Power Station Unit 1.
Subsecuently, we initiated an investigation of the potential report-able c.eficiency.
Our investigation has not been completed.
- However, the following preliminary information has been developed to serve as an interim report:
A.
Potential Problem - Radiographs of the field weld to the second 900 elbow of the RPV drain line, downstream from the RPV, revealed a one-inch oval discontinuity at the inside surface located at the outside radius of the elbow.
Some foreign material was found inside the elbow.
Subsequent investigation of the discontinuity has shown a wall-thickness as small as 0.254-inch, which compares to a nominal wall thickness of 0.354-inch for the two-inch Schedule 160 elbow.
B.
Resolution Approach - We plan further investigations and analyses of the elbow after its removal fro: the drain line.
Removal is tentatively-scheduled for the week of July 14.
C.
We anticipate an additional thirty days will be required to complete the investigation.
We w_ I file a final report about mid to late August, 1980.
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U-0156 Ll4-80(07-14)-0 Mr. James G. Keppler July 14, 1980 Page 2 If you have any con:ments with regard to this information, please notify me as appropriate.
Sincerely i
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Vice President GEW:dl cc:
Director, Cffice of I&E, NRC, Washington, D.C.
H. H. Live = ore, NRC Resident Inspector l.
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