ML20006D124

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Requests Approval,Per 10CCFR50.55a,for Use of Alloy 690 Matl in Fabricating/Use of Steam Generator Plugs During Upcoming Refueling Outage.Alloy 690 Currently code-approved Matl for Steam Generator Tubing Based on Corrosion Resistance
ML20006D124
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 02/01/1990
From: Bradham O
SOUTH CAROLINA ELECTRIC & GAS CO.
To: Hayes J
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9002120127
Download: ML20006D124 (2)


Text

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South Ccrolina Electric & Gas Comp ny- ome S. Bradham

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February 1, 1990 Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 Attention: Mr. Jack J. Hayes, Jr.

SUBJECT:

Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Proposal of Alternative to ASME Boiler and Pressure Vessel Code Section III Requirements Gentlemen:

-The purpose of this letter is to request approval in accordance with 10 CFR 150.55a (a)-(3),~for the use of SB-166. UNS N06690-(Alloy 690) material in fabricating steam generator plugs. The design values that will be used for code calculations will be based on.those given in Code Case N-474, approved May 6, I- 1989 for SB-163 material, and Code Main Committee Item 88-360, approved December

! 9.-1988 for all forms of Alloy 690.

L Babcock-and Wilcox has requested'ASME approval for the application of Alloy 690,

-Specification'SB-166, SB-167, SB-168, and SB-564 material, for ASME Section III repairs. --The ASME Boiler and Pressure Vessel Code Committee has reviewed this l request and assigned this request as an addenda to'the N-474 Code Case. The l

Code Case number for this request is N-474-1.

.Your approval'of this proposal is requested by March 2, 1990 to allow the use of Alloy 690 steam generator tube plugs during the upcoming refueling outage for V.

C. Summer. Nuclear Plant. The need for this material is based on the recent

. problems that have been associated with Alloy 600 when used as mechanical steam generator plugs. Inconel A11oy 690 has been shown in various industry tests and literature to have' superior corrosion resistance to that of Alloy 600. Alloy 690 is currently recognized as a code-approved material for steam generator tubing and sleeving based on its improved corrosion resistant properties. South Carolina Electric & Gas Company contends that the level of quality and safety is enhanced by utilization of Alloy 690 for plug related activities in the steam generators. Therefore, the use of Alloy 690 is the preferred choice of material for steam generator plugging applications to avert potential plug cracking concerns.

9002120127 900201 PDR ADOCK 05000395 h, y

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L af-Document control Desk February 1, 1990 -

Page 2 of .

Should there be any questions, please call us at your-convenience, d -- Very truly jours, 4

0. S. Bradham ARR/OSB: led-c: . D. A. Nauman/0. W. Dixon, Jr./T. C. Nichols, Jr.

E. C. Roberts R. V. Tanner S. D. Ebneter

.J. J. Hayes,-Jr.

General Managers C A. Price R. B. Clary-K. E. Nodland J. C. Snelson R. L. Prevatte J. B. Knotts, Jr.

NSRC NPCF

'RTS (NRR 90001)

File (810.01)

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