ML20086M750
| ML20086M750 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/20/1995 |
| From: | Denton R BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-92-01, GL-92-1, NUDOCS 9507240444 | |
| Download: ML20086M750 (2) | |
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Cort E. Duros Baltimore Gas rnd Electric Company
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Calvert Oiffs Nuclear Power Plant Vice President I
Nuclear Energy 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 586-2200 Ext.4455 local 410 260-4455 Baltimore July 20,1995 l
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U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant l
Unit No. 2; Docket No. 50-318 Generic Letter 92-01, " Reactor Vessel Structural Integrity" Close+ut i
Iztter/Upocr-Shelf Enerev for Weld Seams 2-203-A.B.C frac No. M83447)
REFERENCES:
(a)
Ixtter from Mr. R. E. Denton (BGE) to Document Control Desk (NRC),
dated May 11, 1994, Response to the NRC Generic Letter 92-01,
" Reactor Vessel Structural Integrity" Close-out Letter (b)
Letter from Mr. D. G. Mcdonald, Jr. (NRC) to Mr. R. E. Denton (BGE),
dated April 11,1994, Generic Letter 92-01, Revision 1, " Reactor Vessel Structural Integrity," Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (c)
Letter from Mr. R. E. Denton (BGE) to Document Control Desk (NRC),
dated August 30,1994, Generic Letter 92-01, " Reactor Vessel Structural Integrity" Close-out Letter / Upper-Shcif Energy for Weld Seams 3-203-A,B,C (TAC No. M83446)
(d)
Letter from Mr. D. F. Pilmer (C-E Owners Group) to Document Control Desk (NRC), dated July 7,1995, C-E Owners Group Submittal of CEN-622, ' Generic Upper Shelf Values for Linde 1092,124, and 0091 Reactor Vessel Welds" By letter dated May 11,1994 (Reference a), we provided our schedule to resolve the two open issues identified in your close-out letter to the Generic Letter 92-01 (Reference b). The first open issue concerns the determination of the unitradiated upper-shelf energy (USE) value for the Cahrrt Cliffs Unit 1 Reactor Vessel Weld Scams 3-203-A,B,C. He second open issue concerns the determination of the unitradiated USE value for the Cahcrt Cliffs Unit 2 Weld Seams 2-203-A,B,C. Reference (c) provided the resolution to Issue No.1. His letter provides the unirradiated USE value for Unit 2 Weld Seams 2-203-A,B,C in resolution of Open Issue 2.
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,n Document Control Desk July 20,1995 Page 2 As we informed you in Reference (a), a Combustion Engineering Owners Group (CEOG) task was initiated to establish the basis for the use of generic unirradiated USE values for Combustion Engineering fabricated reactor pressure vessel welds. He Owners Group task was completed and the results have been submitted to you in CEOG Topical Report CEN-622 (Reference d).
The Calvert Cliffs Unit 2 Weld Seams 2-203-A,B,C are submerged arc welds fabricated using Weld Wire IIcat A8746, Flux Type Linde 124, Flux Lot 3878. The topical report recommends a conservative unitradiated USE value of 83.5 ft-Ib for welds fabricated using Flux Type Linde 124.
We have reviewed the CEOG topical report and agree with the methodology used to determine the generic USE values. %crefore, we will use the recommended unirradiated USE value of 83.5 ft-lb for the Calvert Cliffs Unit 2 Weld Scams 2-203-A,B,C. This closes out Open Issue 2.
Should you have questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours, k
RED /GT/dlm cc:
D. A. Brune, Esquire J. E. Silberg, Esquire L. B. Marsh, NRC D. G. Mcdonald, Jr., NRC T. T. Martin, NRC P. R. Wilson, NRC R.1. McLean, DNR J.11. Walter, PSC D. F. Pilmer (CEOG) l