ML20211E960

Forwards Whipjet Program Rept & Proprietary App B, Stainless Steel Matl Properties Re Alternate Approach to Pipe Break Protection for balance-of-plant Piping. Expeditious Review Requested

ML20211E960
Person / Time
Site:	Beaver Valley
Issue date:	10/23/1986
From:	Carey J DUQUESNE LIGHT CO.
To:	Harold Denton, Tam P Office of Nuclear Reactor Regulation
Shared Package
ML19292G154	List: ML20211E960 ML20211F244
References
2NRC-6-112, TAC-62883, NUDOCS 8610290185
Download: ML20211E960 (4)

Text

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%N g 2NRC-6-112 Beaver Valley No. 2 Unit Project organization Telecopy 5 Ext.160 f.$, s,8"$['

, Oct. 23, 1986 Shippingport, PA 15077 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION: Mr. Peter Tam, Project Manager Division of PWR Licensing - A Office of Nuclear Reactor Regulation

SUBJECT:

Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 WHIPJET Final Report

REFERENCES:

1) Letter 2NRC-6-083 from J. J. Carey (DLC) to H. R. Denton (NRC) -

dated August 12, 1986.

2) Letter from P. Tam (NRC) to Duquesne Light Company dated September 22, 1986.

3) Letter from P. Tam (NRC) to J. J. Carey (0LC) dated September 12, 1986. ,

Gentlemen:

Enclosed herewith, please find, three (3) copies of the WHIPJET final report on an alternate approach for providing protection against pipe breaks for balance-of-plant piping at Beaver Valley Power Station Unit No. 2. Favor-able final conclusions and final results are presented. Information needed by the staff to prepare a safety evaluation report is provided.

This final report has been developed through numerous progress meetings and conference calls with the staff and its consultants over the past year. A draft was submitted at the special WHIPJET meeting on August 13, 1986 (reference 1). Subsequently, a fifth progress report meeting was held on August 27, 1986 in Bethesda, Maryl and (reference 2). In that meeting, the following requirements were stipulated by the staff and its consultants and they have been reflected in the final report:

1. Need only analyze the highest stress location with the worst (lowest) material properties in a particular line.

2. Use a margin of 10 on the proven leak detectability limit of 0.5 gpm for inside containment.

Mr Zuse L 8610290185 86?O23 ICF ADOCK 05300412 8lI SAC 884- I 10 8 P O R, - CF 9b(L ,

United States Nuclear Regulatory Commission Mr. Harold R. Denton, Director WHIPJET Final Report Page 2

3. A lower margin on leak detectability can be used for outside contairunent; the limiting leak detectability is dependent upon the EPRI tests at Wyle Labs (which consequently verified a limit of less than 0.1 gpm as witnessed by the staff and its consultants on October 9,1986).

4. Calculate leak rates using the PICEP code with mean (best estimate, not lower bound) base metal stress-strain properties for all break locations (including welds).

5. Calcul ate crack stability using lower bound stress-strain and J-resistance (J-R) curve properties; when a weld is involved, two c alcul ations should be performed: first wi th weld metal stress-strain and weld metal J-R properties, and second with base metal stress-strain and base metal J-R properties; the limiting condition for these two calculations should be used to assess stability.

6. Use a margin of 1.8 or greater on the leak rate crack size for assessing stability for (Normal + SSE) loads.

The staff issued a review status on Septenber 12,1986 (reference 3).

The subjects described in enclosure 1 have been appropriately included in the final report. Tne questions in enclosure 2 were addressed in a PWR-A Engi-neering Branch Audit on Septenber 16 and 17,1986 at Stone and Webster offices in Boston. Appropriate revisions have been incorporated in the report and the section on crack propagation analyses has been specifically rewritten.

Please note that Appendix B of the report contains proprietary inform-ation on the properties of austenitic steel base metal and weld metal . The request for withholding this information from public disclosure in accordance with 10CFR2.790 is enclosed. This application for withholding is being made by Duquesne Light Company on the behalf of its subcontractor on this project, Robert L. Cloud and Associates (affidavit attached).

Likewise, please note that Appendix C refers to information on the properties of ferritic steel base metal and weld metal which is also proprietary. It will be submitted separately by October 31, 1986.

United States Nuclear Regulatory Commission Mr. Harold R. Denton, Director WHIPJET Final Report Page 3 This WHIPJET final report is being submitted in a timely manner and a similar expeditious final review would t'e greatly appreciated. It is hoped that its contents will enable you to draw f avorable final conclusions and to issue a favorable safety evaluation report. If Duquesne Light Company can f acilitate the efforts in any way, please let us know.

DUQUESNE LIGHT COMPANY By

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Sr.Vic$farey 77 e4 resident -

JJS/ijr NR/WHIPJET Attachments AR/NAR i

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United States Nuclear Regulatory Commission Mr. Harold R. Denton, Director WHIPJET Program Report Page 4 COMMONWEALTH OF PENNSYLVANIA )

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COUNTY OF BEAVER )

On this / [ day of [ M,-/c.(c) , /(( , before me, a Notary Public in and for said Commonwealth and County, personally appeared J. J. Carey, who being duly sworn, deposed and said that (1) he is Vice

, President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge.

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Notary Public SHtitA M. FATTOEE, N0it.*? I"%lG SHIPPtf]GP02T BORO, 3;KA2 c4?TY WY COU2135100 EXF12!! OCT. 23.1939 tien:ber, Pennsyt/:nia Association of Notaries

ROBERT L. CLOUD ASSOCIATES. INC.

125 UNIVER$17Y AVENUE.. -

20 M AIN STREET SERKELEY CALtFORNIA 94780 COTUIT. MASSACHUSETTS O2635 (4153 84l.9200 g 617 3 428.3 250 TELEX NO: 558 459 Odtober 17, 1986 M P104-008 v

Beaver Valley 2 Project WIPJET Program U.S. Nuclear Regulatory Commission Bethesda, MD This affidavit is submitted by Robert L. Cloud and Associates, Inc. (RLCA), for the WIPJET Program report appendicies, where indicated. RLCA is a Duquesne Light Company subcontractor for this proj ect. The contents of the WIPJET program are proprietary containing confidential technical subject natter.

Public disclosure of the information contained in the UHIPJET report would cause substantial financial harm to RLCA because numerous man-hours spent in research and data gathering would be lost.

S.M. AEUNG

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-President bert L. Cloud As ociat , Inc.

STATE OF CALIFORNIA On this . 1.7.th. . . . day or. . . . Oc t oy,e r . .in the year .

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, COUNTY OF. . ALAEDA.. .

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ARLENE G. MORRIS subeeribed to this instrument, and acknowledged that . . . he . . . . executed it.

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