ML20062K829
| ML20062K829 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 08/11/1982 |
| From: | Tramm T COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 4563N, NUDOCS 8208180026 | |
| Download: ML20062K829 (15) | |
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- 7 Commonwealth Edison T , ona First National PL:za. Chicigo, litinois O* Address Reply to: Post Office Box 767
\ Chicago, Illinois 60690 Augus t 11, 1982 .
Mr. Harold R. Denton, Director Of fice of Nuclear Reactor Regulation U.S. Nuclear Regulatory Com.nission , Washington, DC 20555 l i Subjects Byron Station Unit 1 Preservice Inspection Relief Requests NRC Docket No. 50-454 i Re ference (a): April 7, 1982 letter from T.R. Tramm to H. R. Denton.
Dear Mr. Denton:
This is to request relief from specific ASME Section XI requirements for automated pressure vessel preservice examination of Byron Station Unit 1.- The program plan for this work was provided in reference (a). Enclosed with this letter are relief requests NR-9 and NR-10. These requests identify the welds for which volumetric , 4 examination is not practical and provides a justification for the requested relief. NRC action on these requests is needed by September 15, 1982, to support field activities. Please direct further questions r regarding these relief requests to this office. I One signed original and fifteen copies of this letter are provided for your use. Very truly yours, fI
- f.Ad W >
T. R. Tramm
- Nuclear Licensing Administrator i 1m 4563N 8208180026 820811 PDR ADOCK 05000454 A PDR
RELIEF REQUEST NR-9
- 1. SYSTEM: Reactor Pressure Vessel
- 2. NUMBER OF ITEMS: 3
- 3. A.S.M.E. CODE CLASS: 1
- 4. A.S.M.E. CODE SECTION XI REQUIREMENTS: Examination Category B-A, Figures IWB-2500-1, IWB-2500-3, IWB-2500-4, volumetric examination of the weld volume described in these figures is required over essentially 100% of the weld length.
- 5. BASIS FOR RE'IEF:
- a. Lower Shell Course-to-Dutchman Weld, WR-29, (IWB-2500-1) has six core barrel locating lugs welded to the interior surface of the pressure vessel just above Weld WR-29. The lugs are physical obstructions to the search unit for examinations from the top side of the weld and 100% coverage cannot be achieved. The areas that did not receive 100% examination are shown on Attachment NR-9 Figure 1 through 4.
- b. Lower Disk to Dutchman Weld, WR-16 (IWB-2500-3) has instrument tubes that penetrate the lower head physically obstructing the search unit and/or the search unit positioning device which prevents 100%
l examination. The areas that did not receive 100% examination are l shown on Attachment NR-9 Figures 5 through 7.
4
- 5. BASIS FOR RELIEF - (Continued)
- c. Nozzle Shell Course to Reactor. Vessel Flange Weld, WR-7 (IWB-2500-4),
the reactor vessel flange contains a taper above Weld WR-7 which prevents 100% examination of the adjacent base metal for transverse reflectors from the top side _of the weld. Ilowever, all the weld metal and 3 inches of adjacent base metal were examined. Attachment NR-9 Figure 1.
- 6. ALTERNATE TEST MET 110D: None
- 7. JUSTIFICATION: Completing the remaining portions of the required examination is impractical and would result in undue hardship without a compensating increase in safety. The limited Section XI examination, the volumetric examination performed during fabrication and hydrostatic tests demonstrate an acceptable level of preservice structural integrity.
l l f I
4 +A- .-4 h um, _ RELIEF REQUEST NR-9 ATTACHMENT 1
- Figure 1 l
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-RELIEF REQUEST NR-10
- 1. SYSTEM: Reactor Pressure Vessel
- 2. NUMBER OF ITEMS: Four (4)
- 3. A.S.M.E. CODE CLASS: 1
- 4. A.S.M.E. CODE SECTION XI REQUIREMENTS: Examination Category B-D, Figure IWB-2500-7, Volumetric examination of the examination volume shown in Figure IWB-2500-7 is required over essentially 100% of the weld length.
- 5. BASIS FOR RELIEF: Nozzle to Vessel welds on nozzles A, D, E, and H, the examination for. transverse reflectors is performed from'the reactor vessel-surface. The integral extension on the outlet nozzles is a physical obstruction to the search unit which prevents 100% coverage of adjacent base metal near the nozzle bore. However, all of the weld metal and 4 inches of adjacent base metal were examined. As shown on Attachment 1.
t l l
- 6. ALTERNATE TEST METHOD: None
- 7. JUSTIFICATION: Completing the remaining portions of the required examination is impractical and would' result in undue hardship without compensating ine'rease in safety. The limited Section XI Examination, the volumetric examination performed during fabrication and the Hydrostatic tests demonstrate an acceptable level of preservice structural integrity.
, . , _ - , ~ . . . . . -
RELIEF REQUEST NR-10 Attachment 1 Figure 1 Estimate of the Extent of Near Surface Volume not Effectively Examined: BASE METAL NEAR WELD DESIGNATION TRANSDUCER SURFACE NOT EXAMINED Exaninations of Nozzle-to-Vessel Welds (8) 45* Transverse 0.60 0* Laminar and Planar 1.69 4 ' ,, . . . A _ _ _ _______
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