ML19351E534
| ML19351E534 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 12/03/1980 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8012100421 | |
| Download: ML19351E534 (2) | |
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P C. Box 5000 m CLEVELAND. oH'O 44101 e TELEPHONE (216) 622 9600 e fLLOWNAT NG BLOG.
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December 3, 1920 7
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Mr. James G. Keppler Director of Region III Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 799 Roosevelt Road I0137 Glen Ellyn, Illinois s
RE:
Perry Nuclear Fower Plant Docket Nos. 50-440; 50-441 Interim Report on Degradation of Fuel Pool Penetration Piping (G-41 System)
Dear Mr. Keppler:
This letter serves-as an Interim 2eport as required by 10CFR50.55(e) concerning the degradation of the G-41 System, fuel pool penetration piping.
This was first reported by W. J. Kacer of the Cleveland Elec'ric Illuminating Company to J.
Konklin of your office on i',vember 3,1980.
This report includes a description of the deficiency, a statement of possible safety implications, and the cortactive action taken to date, Description of Deficiency While performing additional. investigation to determine acceptability and provide adequate justification to a proposed "Use As Is" disposition to NCR's53-182 and 53-204, the following deficiency was identified.
During the process of making the, attachment welds between the fuel pool liner and leak chase to the. G-41 System (fuel pool cooling and clean-up),
there was an apparent misapplication of the welding procedure. This resulted in an excessive heat input to the pipe material (SA 312-304 stainless steel) causing an oxidation and expulsion of base material from the inside diameter of the pipe. This resulted in a thinning of the pipe wall to varying degrees. In one identified area, there is a cavity approx-imately.125 inches deep in a pipe with a nominal wall of.165 inches.
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hr, Jr. mas G. Kappler Dacembsr 3, 1980 Statement of Possible Safety Implications i
This piping system is designated ASME Section III, Class 3.
The ' deficiency l
1s limited to the penetration piping to the lower pools located in the fuel handling area of_the Inter.nediate Building. This system has a design pres-sure of 150 psig and operating temperature of 127'F (below 150'F when larger than average. amounts of spent fuel are stored in the pool). The affected 4
piping had been hydrostatically tested at 187.5 psig and accepted. The. mat-erial specifications for SA 312 material requires minimum wall at any point shall not be more than 12.5 ;3rcret under the nominal wall thickness specified.
This deficiency would have gone uudetected had it not been for the additional, more restrictive inspections requested to provide adequate basis for a "Use As Is" disposition to two Nonconformance Reports which document a sof tware defi-ciency.
1 Corrective Action Takhn to Date I
The Construction Quality Engineering Unit has initiated Nonconformance Report CQA-178 documenting known deficiencies in two penetrations and the indeterminate 4
status of twenty-four additional assemblies. This NCR has been dispositioned, directing the contractor responsible for the' deficiency to investigate and fully identify the problem. He is also to provide a recommended disposition based on cetallurgical sampling, J
I Evaluation of the proposed disposition to assure system reliability and safety will be completed and a final report submitted by March 1, 1981.
Very truly yours, b
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Dalwyn Davidson Vice President System Engineering and Construction
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J. Hughes U.S. NRC -- Site l
Mr. Victor Stello, Director,
Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, DC 20555 U. S. Nuclear Regulatory Commission c/o Document Management Branch Washington, DC 20555 O
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