ML20072P571

Provides Unirradiated Use Value for Calvert Cliffs Unit 1 Weld Seams 3-203-A,B & C in Resolution of Open Issue 1 in GL 92-01, Reactor Vessel Structural Integrity

ML20072P571
Person / Time
Site:	Calvert Cliffs
Issue date:	08/30/1994
From:	Denton R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-92-01, GL-92-1, TAC-M83446, NUDOCS 9409080055
Download: ML20072P571 (2)

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l Rourwr E. Dem,om Baltimore Gas and Electric Company Vice President Calvert Chfs Nuclear Power Plant Nuclear Energ~y 1650 Calvert Chfp Parkway Imby, Maryland 20657 4to 586-22cm Ext. .n55 lxcal 4to 260-4455 Baltimore August 30,1994 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION: Dccument Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit No.1; Docket No. 50-317 Generic Letter 92-01, " Reactor Vessel Structural Integrity" Close-out Letter /Upger-Shelf Energy for Weld Scams 3-203-A.B.C (TAC No. M83446)

REFERElCES: (a) Letter from Mr. R. E. Denton (BGE) to NRC Document Control Desk, 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 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 unirradiated upper-shelf energy (USE) value for the Calvert Cliffs Unit I reactor l vessel Weld Scams 3-203-A,B,C. The second open issue concerns the determination of the unirradiated USE value for the Calvert Cliffs Unit 2 Weld Seams 2-203-A,B,C. The schedule we provided for the resolution of these two issues are August 31,1994, for Open issue 1, and July 31,1995, for Open Issue 2.

This letter provides the unirradiated USE value for Unit 1 Weld Seams 3-203-A,B,C in resolution of Open Issue 1.

As we informed you in Peference (a), to establish the unirradiated USE value, we purchased a section of Long Island Lighting Company's Shoreham reactor vessel containing a weld that is virtually identical to Calvert Cliffs Unit 1 Weld Seams 3-203-A,B,C. The Calvert Cliffs Unit I and the Shoreham reactor vessels were both fabricated by Combustion Engineering during the same time frame. In particular, the Shoreham Weld Seam 5-306 and the Calvert Cliffs Unit i Weld Seams 3-203-A,B,C were fabricated using Wire Type B4-Mod, Wire lleat 21935, Flux Type Linde 1092, and Flux Lot 3869. We performed Charpy V-notch impact testing on the Shoreham weld and obtained an USE value of 109 ft-lbs.

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Document Control Desk l August 30,1994 Page 2 i

llenceforth, we will use the unirradiated USE value of 109 f1 lbs for the Calvert Cliffs Unit 1 Weld Scams j 3-203-A,B,C. This closes out Open issue 1. We expect to close out Open Issue 2 on or before the l scheduled date.

Should you have any questions regarding this matter, we will be pleased to discuss them with you.

Very tmly yours,

\

RED /GT/ dim cc: D. A. Brune, Esquire J. E. Silberg, Esquire M. J Case, NRC D. G. Mcdonald, Jr., NRC T. T. Martin, NRC '

P. R. Wilson, NRC R. I. McLean, DNR J. II. Walter, PSC P

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