ML20235E131

Requests Addl Info,Including Description of Testing Procedure,Explanation of Position Indicator Sys Used for Vacuum Breakers & How Indicators Alert Operators,For Review Re Pressure Suppression Under All LOCA Conditions

ML20235E131
Person / Time
Site:	Quad Cities, 05000000
Issue date:	08/09/1972
From:	Skovholt D US ATOMIC ENERGY COMMISSION (AEC)
To:	Brian Lee COMMONWEALTH EDISON CO.
Shared Package
ML20235B311	List: IA-87-111, Submits Rept on Plant,As Discussed in ACRS 150th Meeting on 721012-14.Listed Items Can Be Resolved During Const & Facility Can Be Constructed W/Reasonable Assurance for Operation W/O Undue Risk to Public Safety IR 05000254/1972009 IR 05000358/1972003 IR 05000358/1973001 IR 05000358/1973002 IR 05000358/1973003 IR 05000358/1973005 IR 05000358/1973006 IR 05000358/1973007 IR 05000358/1974001 IR 05000358/1974002 IR 05000358/1974003 IR 05000358/1975004 ML20235B308 ML20235B364 ML20235B401 ML20235B405 ML20235B424 ML20235B456 ML20235B461 ML20235B465 ML20235B477 ML20235B488 ML20235B507 ML20235B552 ML20235B582 ML20235B585 ML20235B588 ML20235B605 ML20235B618 ML20235B623 ML20235B649 ML20235B656 ML20235B662 ML20235B670 ML20235B679 ML20235B683 ML20235B687 ML20235B702 ML20235B708 ML20235B713 ML20235B714 ML20235B718 ML20235B720 ML20235B730 ML20235B734 ML20235B748 ML20235B754 ML20235B762 ML20235B764 ... further results
References
FOIA-87-111 NUDOCS 8709250491
Download: ML20235E131 (2)

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50 9 5 72 i Docket Nos. 50-154 d and 50-265 l

1 Cremonwealth Edison Company ATTN: Mr. Byron Lee, Jr. -

Assistant to the President Post Office Box 767 Chicago, Illinois 60690 {

Gentlemen:

In our letter to Commonwealth Edison dated July 26, 19 U , item number 10 (

stipulated that additional technical specifications were needed for the i suppression chamber vacuum breakers to the drywell. Y,our response to this item should be submitted as an amendment to the SAR.with three signed originals and thirty-seven additional copies.

In order to assure satisfactory pressure suppression under all LOCA conditions, additional information regarding the vacuum breakers is required for our reviews

1. The vacuum breakers shall be tested at the same intervals as the ECCS valves. Describe your testing procedure, the bases for these procedures, and the frequency of testing.

2. Radundant position indicators shall be provided en the vacutza breakers. Explain the position indicator system used for these vacuum breakers and how these indicators alert the operators when a vacuum breakar(s) becomas inoperable or does not completely close. Ins trumen ta tion LCO and surveillance requirements also are required.

3. Prwide analyses of the consequences for different oize primary coolant system line breaks if the vacuum breaker (s) does not completely close. Explain what limitations are imposed upon the open vacuum breaker (s) and the bases for these limitations. The analyses should show the effects of bypass leakage on resultant containment pressure accident response, within contabanent capability, as a ,

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8709250491 870921 PDR FOIA MENZ87-111 PDR

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Cosanoowealth Edison Company function of break sine for the spectrum of reactor coolant breaks with vacum breaker opening' in degrees or inches off the seat (and number of vacuust breakers considered)'

as a paramatsr.~ j

4. Provide vaceuss breaker descriptive information, including seat material and capabilities to seal at accident temper-atures and pressures. Reliability dats to open, close, and seal, as designed, for the type of vacuum breakar '

used relative to its design life aise are required for our review.

The abuve information is required ENr our review not later than August 31, 1972. -

e'f g Sincerely, k4 f/fA' Donald J. Skovbolt Assistant Director for Operating Reactors Directorate of Licensing cc. Mr. Charles finitmore Distribution

! President and Chairman . WDooly, DR 8' Iowa-Illinois Gas and RO (3)

Electric Company HShapar, OGC 206 East Second Avenua JRBuchanan, ORNL Davenport, Iowa 52801 PDR Local PDR John W. Rowe, Esquire Docket File

- Isham, Lincoln & Saale 6 DL Reading Counselors at Las Branch Reading One First National Pisza ACRS (16)

Chicago, Illinois 60670 RTedesco, DL RBoyd, DL DJSkovholt, DL RDeYoung, DL DLZiemann, DL GLainas, DL RIRiesland, DL CLong, DL RMDiggs, DL ASLBP MRowden, OGC MKarman, OGC

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8/9/72 8/,,f/72 8/j,/_72 Form AEC 518 (Rev. 9-53) AECM 0240 l

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