ML20069J849
| ML20069J849 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/08/1982 |
| From: | Fiedler P GENERAL PUBLIC UTILITIES CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8210250285 | |
| Download: ML20069J849 (3) | |
Text
{{#Wiki_filter:* GPU Nuclear [ g gf F.O. Box 388 Forked River, New Jersey 08731 609-693-6000 Writer's Direct Dial Number: October 8, 1982 Mr. Dennis M. Czutchfield, Chief Operating Reactors Branch No. 5 Divison of Licensing U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, MD 20034
Dear Sir:
Subj ect: Oyster Creek Nuclear Generating Station Docket No. 50-219 Inservice Inspection Program As required by 10 CFR 50.55(a)(g)b)(iii), GPU Nuclear (GPUN) has performed a review of the Inservice Inspection Program requirements for the Oyster Creek Nuclear Generating Station. The enclosure describes the results of our review and provides justification for relief in inspecting ten (10) dissimilar metal welds (nozzle-to-safe-end welds) in the Recirculation System at Oyster Creek. Based on the information provided in the enclosure, we request relief from inspecting the following welds using volumetric and surface examination methods: NG-A-26 NG-A-1 NG-B-25 NG-B-1 NG-C -24 NG-C-1 NG-D-23 NG-D-1 NG-E-27 NG-E-1 In the event that any commentes or questions arise, please contact Mr. J. Knubel at (201) 299-2264. Very truly yours, K 4.,,) Peter B. Fiedler Vice President and Director Oyster Creek cc: Mr. Ronald C. Haynes, Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue d Nk L King of Prussia, PA 19406 NRC Resident Inspector Oyster Creek Nuclear Generating Station 8210 2 5 o2 3 s d Forked River, NJ 08731 GPU Nuclear is a part of the General Public Utihties System
Enclosura Category - B-F Item Number - Bl.6 Identification - Pressure-Retaining Dissimilar Metal Welds (Nozzle-to-Safe-End Welds) System - Recirculation System Weld I.D.'s - NG-A-26 NG-A-1 NG-B-25 NG-B-1 NG-C-24 NG-C-1 NG-D-23 NG-D-1 NG-E-27 NG-E-1 Required Exam - Volumetric and Surface Relief for Exam 1. Visual Examination during system pressure test, each refueling outage. 2. Visual Examination during system hydrostatic test, each inspection interval. Reason for Relief - Accessibility. In addition NUREG 0313 recognizes clad overlays such as those utilized in this case to preclude intergranular stress corrosion cracking. Bases of Relief - Oyster Creek has recirculation no::le safe ends fabricated from Austenitic 300 series stainless steel. The safe ends are furnace sensitized. For this reason durir.g installations the safe ends were clad on the I.D. with an ' overlay of 30SL material and as a result of surface cracking on the 0.D. were repaired by removing defects and cladding on the 0.D. with an overlay of 308L material. The resulting construction is schematically depicted on Attachment 1. Based on this joint configuration we feel that meaningful volumetric and surface examination is impossible. l
i p g ttcchmsnt 1 A Alloy Steel Nozzle Inconel Shop Weld Inconel Tie-In Cladding 308L Stainless Steel Cladding ~t Stainless Steel Field Y Weld '\\ xN x y s \\/ / / / / / / 'Y i i l Stainless Steel Pipe 308L Stainless Steel Cladding Sensitized Stainless Steel Safe End Inconel Tie-In Cladding Shop Deposited Stainless Steel Cladding SAFE END CLADDItG TYPICAL OF RECIRC. N0ZZLE REPAIR =}}