ML20064N421

Affidavit of KA Ainger Re Changes to Plant Design to Mitigate Potential for KRSKO-type Bubble Collapse Water Hammer in Feedwater Bypass Line.Westinghouse Ltr, Bypass Drawing & Notice of Appearance by Vg Copeland Encl

ML20064N421
Person / Time
Site:	Byron
Issue date:	02/10/1983
From:	Ainger K COMMONWEALTH EDISON CO.
To:
Shared Package
ML20064N412	List: ML20064N409 ML20064N421
References
ISSUANCES-OL, NUDOCS 8302160227
Download: ML20064N421 (7)

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I UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD '

In the Matter of )

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COMMONWEALTH EDISON COMPANY ) Docket No. 50-454 OL

) , 50-455 OL (Byron Station, Units 1 and 2) )

AFFIDAVIT OF KENNETH A. AINGER I, Kenneth A. Ainger, being duly sworn do hereby swear and state:

1. I am employed by Commonwealth Edison Company as a Licensing Engineer in the Byron /Braidwood Project Engineering Department. In that capacity, I review and evaluate issues, events, and occurrences that may impact the safety aspects of the design of the Byron Station. I also ensure that design changes necessitated by the evaluation of such matters are incorporated into the plant design.

2. The purpose of this affidavit is to apprise the Licensing Board and the parties to the Byron licensing proceeding of two changes to the Byron plant design which effect DAARE/ SAFE Contention 9a as that contention concerns 8302160227 830210 PDR ADOCK 05000454 0 PDR

the possibility of a bubble collapse waterhammer in the feedwater bypass piping at the Byron Station similar to the event that occurred at the KRSKO plant in Yugoslavia.

3. A prior affidavit of Ms. Leslie Bowen, dated-October 5, 1982, submitted by letter of counsel, dated October 14, 1982, stated that Edison no longer intended to install temperature sensors on the feeduater bypass system at the Byron Station. This decision was made because the operating guidance provided by Westinghouse indicated that optimum operation of the feedwater bypass system requires constant feedwater flow through the auxiliary nozzle, and such flow would prevent the possibility of a XRSKO-type waterhammer event and thus preclude the need for temperature sensors on the bypass piping. While Edison still intends to maintain a continuous flow through the auxiliary nozzle during all phases of power operation, it has been determined that such a flow-

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would be impractical during the heat-up phase of the plant since it could significantly inhibit the heat-up. Also, such continuous flow could inhibit the ability to maintain the plant in a hot standby condition. Therefore, since continuous flow cannot be practically maintained during the heat-up phase j cr during the hot standby condition, Edison intends to install the temperature sensors on the feedwater bypass piping near l the auxiliary nozzle in order to detect any backleakage of steam or hot water.

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4. In another affidavit of Ms. Bowen, dated June 6, 1982, which was filed on June 7, 1982 as part of Edison's motion for summary disposition, Ms. Bowen stated that the Byron design included an additional check valve in the bypass piping near the auxilie.ry nozzle of the steam generator which is not included in the design of the KRSKO plant. This valve was also noted in Edison's response to question 5 of a series of questions posed by the NRC Staff. Edison's response to the NRC Staff's questions was sent by letter, dated Leptember 9, 1982, to Mr. Harold Denton, and was submitted to the Licensing Board and all parties by letter of counsel, dated October 14, 1982, as an attachment to Ms. Bowen's October 5 Affidavit.

For reasons which are explained in the attached letter, dated February 9, 1983, from Mr. W. E. Kortier of Westinghouse, this valve has been removed from the Byron design and is not in place. Generally, the check valve was removed so as not to-compromise the function of controlled closure check valves located further upstream which ensure the prevention of an t

" acoustic" or " classical" waterhammer caused by rapid valve closure.

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The foregoing information is true and correct to the best of m3 knowledge and belief.

Kenneth A. Ainger &

DISTRICT OF COLUMBIA ) ss SWORN AND SUBSCRIBED to befor , e this /4 A day of

, 1983.

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NOTARY Pt/BLIC

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, \ CBW-4044 Westinghouse Water Reactor manncammnew Electric Corporation DMsions 0"""ensamn saxass PmsowsnPennerhanm15230 February 9, 1983 i

.Mr. J.'D. Deress File: BBL-1000 Project Engineering Manager Byron & Braidwood Projects Commonwealth Edison Company P. O. Box 767 l Chicago, IL 60690 COMONWEALTH EDISON COMPANY BYRON AND BRAIDWOOD STATIONS - UNITS 1 AND 2 Deletion of Non-Damoed Check Valve from Steam Generator Preheater Bypass Line

Dear Mr. Deress:

i Non-damped check valves in the steam generator feedwater and bypass line have been replaced with controlled-closure check valves as identified in the attached figure. At the present time, the non-damped check valve closest to the steam generator auxiliary nozzle still exists. A review of this arrangement indicates that, as a consequence, the non-damped check valve closest to the steam genera-tor auxiliary nozzle is redundant and would act to defeat the purpose of installing the controlled-closure check valves, which is to substantially reduce the severity of the feedline break / check valve slam transient.

Therefore, the non-damped check valve (identified in the attached figure) should be made inoperable. This can be accomplished by either removing the entire check valve from the pipe or by removing the internal disc from each of the identified check valves.

This letter cancels and supercedes our letter CAW-5320/CBW-4039. -

Very truly yours, WESTINGHOUSE ELECTRIC CORPORATION W. E. or er, Manager Commonwe ' th Edisori Projects M0per/ deb J. D. Deress 2L, 2A cc: W. C. Cleff 2L, 2A K. Ainger ll, lA 4

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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of )

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COMMONWEALTH EDISON CO:iPANY ) Docket Nos. 50-454

) 50-455 (Byron Station, Units 1 and 2) )

NOTICE OF APPEARANCE Notice is hereby given that the undersigned attorney herewith enters his appearance on behalf of Applicant, common-wealth Edison Company, P.O. Box 767, Chicago, Illinois 60690, in the abovo-captioned proceeding. In accordance with 10 CFR S2.713, the following information is provided:

Name: Victor G. Copeland Address: Isham, Lincoln & Beale Three First National Plaza Suite 5200 Chicago, Illinois 60602 Telephone Number: (312) 558-7500 Admissions: Supreme Court of Illinois for the Northern District of Illinois

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x Victor G. Copeland Dated: February 9, 1983 ISHAM, LINCOLN & BEALE Three First National Plaza Suite 5200 Chicago, Illinois 60602 (312) 558-7500-l 1

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