ML20235E131
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I 50 9 5 72 Docket Nos. 50-154 d
and 50-265 1
Cremonwealth Edison Company ATTN: Mr. Byron Lee, Jr.
Assistant to the President Post Office Box 767
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Chicago, Illinois 60690 Gentlemen:
In our letter to Commonwealth Edison dated July 26, 19 U, item number 10
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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 I
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.~
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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 Sincerely, g
k4 f/fA' Donald J. Skovbolt Assistant Director for Operating Reactors Directorate of Licensing Mr. Charles finitmore Distribution cc.
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 6
DL Reading Isham, Lincoln & Saale 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
..L:0RB #2 L:0R L
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L oma,.
esland:sj h ggs Ziemann DJSkovho
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Form AEC 518 (Rev. 9-53) AECM 0240 8/j,/_72 8/9/72 8/9/72 8/,,f/72 l
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