ML20086N863

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Provides Response to Request for Addl Info Re Proposed Tech Spec Change Request 1A-191
ML20086N863
Person / Time
Site: Beaver Valley
Issue date: 12/13/1991
From: Sieber J
DUQUESNE LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-M80559, NUDOCS 9112240320
Download: ML20086N863 (2)


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g Beaver Ve 6ey Power Station Shippmggtrt. PA iS0774KY)4 (412) 393 62SS

@e$rSs"$nINudeer Group December 13, 1991 U. S. Nuclear Regulatory Commission Attnt Document Control Desk Washington, DC 20555

Subject:

Eeaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Response to Information Request dated November 14, 1991 (TAC No. M80559)

This letter provides a response to your request for additional information regarding our proposed technical specification change request 1A-191. Specifically, your request was for unirradiated upper shelf energy (USE) for certain reactor vessel welds. please note that this information may be located in several documents previously submitted as discussed below.

Question 1 Confirmation that the weld metal listed in WCAP-10867 is the longitudinal weld 19-714 A end B, and that the reported unirradiated USE of 112 f t-lb is valid for use in the prediction of the drop in USE with irradiation.

Epsoonse The weld metal referred to in the Beaver Valley Unit 1 surveillance capsule report WCAP-10867 was produced using the same wire heat #305424 and flux lot 3889 as was used to fabricate the intermediate shell vertical seams. This is noted in Table 4-1. The unirradiated USE for the weld metal is listed in Table 5-9 as 112 ft-lb.

The intermediate shell vertical welds are identified as 19-714A and B in the Beaver Valley RT-PTS submittal WCAP-10829, Rev. 1, dated March 1986. Table III.3-1 references the welds to the wire heat numbers, and Table B-1 confirms the intermediate shell-longitudinal weld chemistry and its similarity to the surveillance weio.

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6 i COOver Vallcy Pow:r Stction, Unit No. 1

' Response e Information Request dated November 14, 1991 (TAC No. d .559)

Page 2 The report submitted for our Capsule W, WCAP-12005, confirms the surveillance weld was fabricated from the same wire heat and flux lot as the intermediate shell vertical seams, and the unirradiated USE for the weld is 112 ft-lbs. WCAP-6457, "DLC Beaver Valley Unit 1 Reactor Vessel Radiation Surveillance Program", dated October 1974, also confirms the USE value. ,

I ouestion 2 Unirradiated USE for the two other beltline welds:

I

a. Circumferential weld 11-714, wuld wire heat 90136, and i
b. Longitudinal weld 20-714 A and B, weld wire heat 305414.

Response

We do not have unirradiated mechanical property data on the 11-714, 20-714A, or 20-714B welds. Preirradiation testing was performed and recorded for our surveillance weld only.

ouestion l The approximate current EFPY and the specific date (year and month) associated with that value.

Epsnonse Beaver Valley Unit 1 was shut down on October 22,1991, for a maintenance outage. As of that time, it had operated for 8.45 effective full power years (EFPY).

If you have any questions regarding this submittal, please contact Mr. Steve Sovick at (412)-393-5211.

Sincerely,

.-D.

Wil m Sieber c c :- Mr. J. Beall, Sr. Resident Inspector Mr. T. T. Martin, NRC Region I Administrator Mr. A. W. DeAgazio, Project Manager Mr. M. L. Bowling (VEPCO)

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