ML17195A820
| ML17195A820 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/04/1985 |
| From: | Zwolinski J Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| References | |
| GL-84-09, GL-84-9, LSO5-85-06-002, LSO5-85-6-2, NUDOCS 8506100161 | |
| Download: ML17195A820 (3) | |
Text
\\
I bocket Nos.
50-237/249 LS05-85-06;QQ2 Mr. Dennis L. Farrar Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Farrar:
June 4, 1985
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - RECOMBINER CAPABILITY REQUIREMENTS OF 10 CFR 50.44(c)(3)(ii) - GENERIC LETTER (GL) 84-09 Re:
Dresden Nuclear Power Station, Unit Nos. 2 and 3 The staff has reviewed your response, dated June 25, 1984, to GL 84-09.
During the course of this review, the staff found that additional information is required in order that this issue may be resolved. Since you have not provided a complete response addressing the criteria in GL 84-09, we request that you provide the information listed in the enclosure within 45 days of receipt of this letter.
The information requested in this letter affects fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Enclosure:
Request for Additional Information cc w/enclosure:
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. 06/o 1.LB5 os/jL/85 Sincerely, John A. Zwolinski, Chief Operating Reactors Branch No. 5
_Division of Licensing DL:ORB#5 JZwolinski r/JI ""/85 r
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Mr. Dennis L. Farrar Commonwealth Edison Company cc: Robert G. Fitzgibbons Jr.
Isham, Lincoln & Beale Three First National Plaza Suite 5200 Chicago, Illinois 60602 Mr. Doug Scott Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 U. S. Nuclear Regulatory Commission Resident Inspectors Office Dresden Station Rural Route #1 Morris, Illinois 60450 Chairman Board of Supervisors of Grundy County Gr~ndy County Courthouse Morris, Illinois 60450 U. S. Environmental Protecdon Agency Federal Activities Branch Region V Office Dresden Nuclear Power Station ATTN:
Regional Radiation Representative
- 230 South Dearborn Street Chicaqo, Illinois 60604 Regional Administrator Nuclear Requlatory Commission, Region III 799 Roosevelt Street Glen Ellyn, Illinois 60137 Gary N. Wright, Manager Nuclear Facility Safety Illinois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704
REQUEST FOR ADDITIONAL INFORMATION DRESDEN NUCLEAR POWER STATION, UNITS 2 ANO 3 DOCKET NOS. 50-237/249 RECOMBINER CAPABILITY REQUIREMENTS OF 10 CFR 50.44(c)(3)(ii)
GENERIC LETTER 84-09
- 1) 10 CFR 50.44(g) requires that plants such as Dresden Station, Units 2&3, be provided with a post-accident combustible gas control system such as the containment atomsphere 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 tenns indicated in your June 25, 1984 submittal for use in OBA analyses.
Indicate how the Dresden Station, Units 2&3, confonns to this regulation.
- 2)
The CAD system at Dresden Station, Units 2&3, 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 Pump Back System as a backup to the nonnal Drywell Pneumatic Supply System.
Include all necessary operator actions, if pertinent, 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?
Since 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?