ML18037A234
| ML18037A234 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 01/15/1980 |
| From: | Terry J NIAGARA MOHAWK POWER CORP. |
| To: | |
| References | |
| NUDOCS 8001230191 | |
| Download: ML18037A234 (6) | |
Text
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ACCESSION NBRe8001230191 DOC ~ OATEN'0/01/15 NOTARIZED!'O FACIAL:50 410 Nine" Mile Point Auclear Stat/one Unit>> 4 Nfagai a
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SUBJECT:
Interim deficiency rept.re weld of biological shield wall base iing 'to'uter shell plate, Defects discovered 'in horizonta,1 stiffener to inner shell plate welds of-'ing 3, Metallurgical analysis underway. Final iept available 800331
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NIAGARAMOHAVIKPOVIER CORPORATION/300 ERIE 80ULEVARDO'EST. SYRACUSE, N.Y. 13202/TELEPHONE (315) 474.1511
'anuary 15, 1980 Office of Inspection and Enforcement Region I Attention:
Mr. R. T. Carlson, Chief Reactor Construction and Engineering Support Branch U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Dear Mr. Carlson:
Re: Nine Mile Point Unit 2, Docket No. 50-410 A potential significant deficiency involving the Biological Shield llall base ring to outer shell plate.weld was previously reported to Mr. L. Narrow of your staff on May 30, 1979.
The investigation and resolution of this problem has not been 'completed.
Consequently a final report on,this subject will not be available until March 31, 1980.
This letter serves as an interim report.
The results of the metallurgical analysis which were discussed in our September 18, 1979 letter are now in the final stages of being compiled and will be provided in our final report.
The status of the Biolooical Shield wall investigation is summarized as fol1ows:
1.
As reported in our September 18, 1979 report, the base ring to outer
'hell weld has been 100 percent re-examined and reworked as required.
2.
The inner wall to base plate welds have been 100 percent re-examined and reworked as required.
3.
The cover plate to stiffener welds for Rings 1
and 2 are being 100 percent re-examined and reworked as required.
4.
Defects have been discovered in the horizontal stiffener to inner shell plate welds of Ring 3.
Due to the inaccessibility of these welds, it is difficult to determine the extent of the defects QggP.
Therefore, Niagara Mohawk is investigating the most effective alternatives to resolve this matter.
/D 800>S30 i'tt.
L
An independent consultant was contracted to conduct. a metallurgical evaluation of the welds in the Biological Shield Wall.
To aid in, this evaluation a metallurgical analysis has been performed on two sample horizontal stiffenei to inner shell plate welds removed from Ring 3.
P I
As indicated
- above, a final report summarizing our tests and analyses and identifyng any safety implications will be provided by March 31, 1980.
Very truly yours, N1AGARA MOHAWK POWER CORPORATION Joh erry Senior Vice President
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