ML19199A516
| ML19199A516 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/20/1973 |
| From: | John Miller Metropolitan Edison Co |
| To: | Knuth D US Atomic Energy Commission (AEC) |
| Shared Package | |
| ML19199A519 | List: |
| References | |
| NUDOCS 7905030121 | |
| Download: ML19199A516 (2) | |
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METROPOLITAN EDISON COMPANY
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PCST OFFICE 80X 542 READING. PENNSYLV ANI A 19603 TELEPHONE 215 - 929-0601 Nove=ber 20, 1073 Dr. D. F. Knuth Directorate of Regulatory Operations United States Acc=ic Energy Co:_.ission Washington, D. C.
20545
Dear Dr. Knuth:
Subject:
Three h ie Island Nuclear Statien Units 1 and 2 g
Esti=ated Che=1ca nalysis Docket Nos. 50-289 and 50-3204 You were notified on August 27, 1973 of a situation which could be con-sidered reportable under 10CYR50.55(e)(1)(1), " Conditions of Construction Per=its".
This situation involved incc=plete chenical analyses (phosphorus and sulfur) pr-forned by Walworth/Aloyco Co=pany on pressure boundary parts of stainless steel valves supplied for use on Three Mile Island.
Our letter of Septe=ber 26, 1973, which responded to the AEC letter of Septe=ber 14, 1973, outlined a progrs= of corrective action which has now been co=pleted.
CORRECTIVE ACTION:
1.
Walworth/Aloyco located one hundred and fifty-eight (158) archive sa=ples of heats of =aterial for pressure boundary parts of stain-less steel valves supplied for use on Three Mile Island.; clear Station, Units 1 and 2.
2.
Walworth/Aloico had two independent laboratories test the sa=ples for phosphorus and sulfur centent. The first ten (10) archive sa=ples were submitted to International Testing Laboratory, Inc.,
of Newark, New Jersey. Results of this analysis were reported on h rch 19, 1973 to Aloyco. The re=aining one hundred and forty-eight (148) sa=ples were analyred at Carpenter Technology Corporation of Reading, Pennsylvania, and reported to Aloyco on October 10, 1973.
These analyses were partially witnessed by representatives of Metro-politan Edison Company, Gilbert Associates, Inc., 3abcock and Wilcox Co=pany, and Walworth/Aloyco.
3.
The results of the analyses have been independently reviewed by Walworth/Alo'fco, Gilbert Associates, Babcock and Wilcox Co=pany, and Metropolitan Edison Co=pany.
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Dr. D. F. Knuth.
4.
All of the independent reviews concurred with the following:
(a) The results of the analyses show that all samples are well within specificacica ILnits of 0.040* =axi=u= for both phosphorus and sulfur.
(b) Aloyco has listed all heat nunbers including those for which no sa=ples are available. The heat nu=bers for which data is reported chronologically spans those heat nu=bers where sa=ples are not available.
(c) Fro the availability of data fro: si=ilar heats over the period in question and the icw values of =can and standard deviation, it can be assu=ed at a very high confidence level that the phosphorus and sulfur content will not exceed the specified max 1=u: content of 0.040"..
In conclusion, Metropolitan Edison Co=pany has determined that there is sufficient statistical infor=ation available to indicate that although Aloyco did not perfor= actual che=ical analyses of the heats in question, their foundry prac-tice provided adequate control of the phosphorus and sulfur to keep then within the specification =axi=u=s and to establish confidence that all of the valves supplied by Aloyco had phosphorus and sulfur contents within the ASTM A-351 speci-fication li=1ts.
The results of these analyses are available at the Three Mile Island site for your review.
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Very truly yours,'
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'J/G Miller bh
'Vice President ec:H. M. Diecka=p W. A. Verrochi l
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