ML20023B690

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Forwards Rev 1 to Design Rept for Recirculation Sys & RHR Sys Weld Overlay Repairs & Flaw Evaluation at Ei Hatch Nuclear Power Plant,Unit 1.
ML20023B690
Person / Time
Site: Hatch Southern Nuclear icon.png
Issue date: 04/28/1983
From: Gucwa L
GEORGIA POWER CO.
To: Stolz J
Office of Nuclear Reactor Regulation
Shared Package
ML20023B692 List:
References
NED-83-265, TAC-49156, NUDOCS 8305060051
Download: ML20023B690 (2)


Text

Georg a Pe.ver Company (i \. 333 P edmont Avese At'anta. Georg a 30308 Te!cphone 404 5264526 _

Madmg Adcess.

Post OffcCO 80x 4545 Atlanta Georg a 30302 Georgia Power L.T.oucwa tv ou: men ecctrc sys:cm Chef Nuclear Engmeer Power Generat:on Deparin:ent NED-83-265 April 2E, 1983 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555 NRC DOCKET 50-321 OPERATItG LICENSE DPR-57 EDWIN I. HATCH NUCLEAR PLANT UNIT 1 DESIGN REPORT REVISION - RECIRCULATION AND RHR SYSTEMS ANALYSES AND REPAIRS Gentlemen:

By letter dated January 27, 1983, Georgia Power Company submitted information regarding the analyses and repairs of Recirculation System and Residual Heat Removal (RHR) System piping welds which were inspected during the 1982 Hatch Unit 1 maintenance / refueling outage and found to have unacceptable flaw indications . Enclosed as Attachment 6 to that submittal was Revision 0 of NUTECH report no. GPC-04-104, " Design Report For Recirculation System and Residual Heat Removal System Weld Overlay Repairs and Flaw Evaluation at E. I. Hatch Nuclear Power Plant, Unit 1."

Since our submittal of January 27, 1983, NUTECH has revised the design report. Enclosed herein are two copies of Revision 1 of the subject NUTECH l rep rt. The revised NUTECH report supersedes that submitted as Attachment 6

00 in our January 27, 1983, letter. Some of the changes in Revision 1 of the NUTECH design report include:

e Re-calculation of fatigue crack growth for the 5-year design life.

e Resolution of third party reviewer comments regarding any sensitization caused by the weld overlay, and the recirculation sweepolet code stress analysis.

8305060051 830428 PDR ADOCK 05000321 P PDR

l

'e Georgia PowerAh Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 April 28, 1983 Page Two e Addition of Section 9.0 which discusses engineering changes to RHR pipe-to-pipe weld overlay. (Note: The engineering changes were discussed in our February 1, 1983 meeting with the NRC staff.)

Typically, changes are noted in the revised NUTECH report by vertical lines in the margins.

The overall conclusions of the original report are not changed as a result of these revisions.

By copy of this letter, a copy of the revised NUTECH design report is being supplied to NRC Region II for their review.

Should you have any questions in this regard, please contact this office.

Sincerely yours,

f. T 4<~a L. T. Gucwa JAE/mb Enclosures (2) xc: (all w/ 1 encl.)

J. T. Beckham, Jr.

H. C. Nix, Jr.

J. P. O'Reilly (NRC Region II)

Senior Resident Inspector I

700775