ML20137T008

Requests Addl Info Re 840508 Response to Generic Ltr 84-09 on Recombiner Capability Requirement of 10CFR50.44(c)(3)(ii).Response Requested within 45 Days of Ltr Receipt

ML20137T008
Person / Time
Site:	Quad Cities
Issue date:	09/26/1985
From:	Vassallo D Office of Nuclear Reactor Regulation
To:	Farrar D COMMONWEALTH EDISON CO.
References
GL-84-09, GL-84-9, NUDOCS 8509300568
Download: ML20137T008 (3)

Text

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. N September 26, 1985 Docket Nos. 50-254/265 _ DISTRIBUTION iDocket files RBevan NRC PDR DVassallo Local PDR EJordan Mr. Dennis L. Farrar ORBF2 Reading BGrimes Director of Nuclear Licensing HThompson JPartlow Commonwealth Edison Company SNorris OELD Post Office Box 767 ORB #2 Gray File ACRS (10)

Chicago, Illinois 60690

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION Re: Quad Cities Station, Units 1 and 2 By letter dated June 24, 1984, you responded to our Generic Letter 84-09 on recombiner capability requirement of 10 CFR 50.44(c)(3)(ii), dated May 8, 1984. In your letter, you provided information to support your position that recombiner capability is not required by the Regulation. From our review of your letter, we find that additional information is needed to complete our review. Please provide the additional information requested in the enclosure to this letter within 45 days of receipt of this letter.

The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.

Sincerely, Original signed by/

l Domenic B. Vassallo, Chief >

Operating Reactor Branch #2 Division of Licensing

Enclosure:

As stated E cc w/ enclosure:

See next page

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i Mr. Dennis L. Farrar Quad Cities Nuclear Power Station Commonwealth Edison Company cc:

Mr. B. C. O'Brien James G. Keppler President Regional _ Administrator Iowa-Illinois Gas and Region III Office Electric Company U. S. Nuclear Regulatory Commission 206 East Second Avenue 799 Roosevelt Road Davenport, Iowa 52801 Glen Ellyn,' Illinois 60137 Robert G. Fitzgibbons, Jr.

Isham, Lincoln & Beale Three First National Plaza Suite 5200 Chicago, Illinois 60602 Mr. Nick Kalivianakis  :

Plant Superintendant Quad Cities Nuclear Power Station 22710 - 206th Avenue - North Cordova, Illinois 61242 Resident Inspector U. S. Nuclear Regulatory Commission o 22712 206th Avenue North Cordova, Illinois 61242 Chairman Rock Island County Board of Supervisors Rock Island County Court House Rock Island, Illinois 61201 The Honorable Tom Corcoran United States House of Representatives -

Washington, D. C. 20515 Mr. Gary N. Wright Nuclear Facility Safety Illinois Department of Nuclear Safety 1035 Outer Park Drive 5th Floor Springfield, Illinois 62704 Il

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ENCLOSURE Request for Additional Information

1) 10CFR 50.44 (g) requires that plaats such as Quad Cities Station, Units 1 & 2, be provided with a post-accident combustible gas control system such as the containment atmosphere dilution (CAD) system. The staff has indicated that the hydrogen generation rates provided in Regulatory Guide 1.7 should be used in assessing the adequacy of the system. It should be noted that the staff has not approved the revised source terms indicated in your June 25, 1984, submittal for use in DBA analyses. Indicate how the Quad Cities Station, Units 1 &

2, conforms to this regulation.

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2) The CAD system at Quad Cities Station, Units 1 & 2, has been designed to utilize atmospheric air and, therefore, is a potential source of oxygen to the containment in post-LOCA conditions. In light of this :

situation, how do you consider compliance with criterion three of Generic Letter 84-09 with this CAD system?

3) Provide a detailed discussion about how the drywell pneumatic supply system meets the redundancy requirement. In particular, describe the use of the back-up system, if available, to the normal drywell pneumatic supply system. Include all necessary operator actions, if.

necessary, as well as the instrumentation which will be used by the operator. Also, is the inert gas supply to the drywell pneumatic systems designed against single failure?

If the atmospheric air from the Instrument Air System can be used as a backup to the drywell pneumatic systems, describe the procedural controls you have in place to limit the use of this backup system.

When air would be used, would this air supply line be automatically isolated? If so, what are the signals that will isolate it?

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