ML19220A832
| ML19220A832 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/06/1971 |
| From: | John Miller Metropolitan Edison Co |
| To: | O'Reilly J NRC Office of Inspection & Enforcement (IE Region II) |
| Shared Package | |
| ML19220A828 | List: |
| References | |
| NUDOCS 7904250016 | |
| Download: ML19220A832 (2) | |
Text
{{#Wiki_filter:. 2 / M ETROPOUTAN EOiSOn COMPANY %bsidiary of central PubTC Ur, Dies Carcatation i P. o. B o x S 42 R EAc e h G. P EN N S Maai A i G OO U JCHN G. MILLER vicg peatsaccNT December 6, 1971 s Mr. James P. O'Reilly, Director Division of Ccapliance U. S. Atenic Energy Cc==ission Region 1 970 Bread Street ~ Newark, New Jersey 07102 I Re: Your letter to Mr. J. G. Miller dated 10/20/71 Docket: 50-320 E
Dear Mr. O'Reilly:
B&W confir=s that during a visit on A st 24, 25, 1971 by Mr. R. E. Oller of the AEC Division of Cc=pliance, a discussion was 1 held regarding the post veld heat treatment of the D!I-2 Reacter ~k Vessel. He was informed at that time that a repair had been.cade after final post weld heat treatment on the MK 18-2 nc:zle weld to a depth of 7-1/2 inches in a 15 inch thick weld. 3&W's G.uality Centrol Manager, Mr. G. A. Walton advised that the bold time pro-posed would be 7-1/2 hours and not 1 hcur/ inch of the =axinun thickness. While this was censidered by 3&W to ec= ply with, tid intent of existing cede, a state =ent was =ade that a cede case had been presented to the ASME Ccde which would specifically clarify stress relief time requirements on thick wall sections. This case reccgnizes that in the fabrication of very heavy wall thicknesses, the existin6 Ccde requireEents result in holding 2. times that are unduly lengthy and could affect the =aterial proper-ties adversely. Tcughness properties are progressively reduced as stress reli'ef times are extended. ~ Code Case 1492 was approved by the main cei=ittee en September 17, 1971. Inquiry and Reply are as follevs: Inquiry: Sections I, III and VIII (Divisien 1 and 2) require that ~ weld joints be held at the specified temperature a mini =u= r/O 121 7004250016
Mr. James P. O'Reilly December 6, 1971 of one hour f.or each inch of thickness. This holding time for verf thick weld joints would not appear to be necessarf. Under what conditions =ay alternate mini.u holding times be applied? Reply: It is the opinion of the Co:.ittee that alternative =ini=u holding times for post veld heat treatment of thick weld joints =ay be applied for all =2terials requiring post weld heat t:eatments, except those of Grcup P-No.11 of Table Q-l'.1 of Section IX. The alternate minimum holding time shall be applicable to thickness exceeding 5 inches, and shall be five hours, plus an additional 15 minutes for each additional inch, or fraction thereof, of thickness over five inches. Althou6h this case does not =ake any differentiation between original construction and repair welds, the time requirements in the case were met by the heat treatment given the ' repair veld on this vessel. It is considered that the above code case clearly' indicates that the post veld heat treatments of the TMI-2 Reactor yessel are fully in co=pliance with all requirements of the AS'G Section III Code. We trust that this answer resolves any question pertaining to the post weld heat treatment of the TMI-2 Reactor Vessel. Very truly yours, s J i v A/f/ - /' i P Jr G ' Miller / =el 70 122}}