ML17195A849
| ML17195A849 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/01/1985 |
| From: | Zwolinski J Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| References | |
| LSO5-85-06-037, LSO5-85-6-37, NUDOCS 8507030295 | |
| Download: ML17195A849 (5) | |
Text
Docket Nos. 50-237/249 LS05-8.5-06-0 37 Mr. Dennis L. Farrar Director of Nuclear Licensing
, Commonwea 1 tli.Edf son Company Post Office Box-767 Chicago, Illinois 60690
- . ~ear Mr.~Farrar~
July l, 1985
SUBJECT:
. REQUEST.FOR, ADDITIONAL INFORMATION REVERIFICATIOM OF. POST;..FIRE.
ALTERNATIVE SHUTDOWN AND SCHEDULAR EXEMPTiONS FROM 10 CFR 50.48
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.(APPENDIX R) REQUIREMENTS 1,,
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- Re:
~ Oresden ~uclear Power Station, Unit Nos. 2 and* 3
'The staff h~s r~v.iewed your submittals dated.Auoust 10, 1984 and March 1, 1985 which proposed"~evisions to your approach for post-fire alternate shutdown and requested schedular exemptions from 10 CFR 50.48 requirements.
During the tou~se of this.review, the ~taff found that additional information is -required in order th.at these issues may be. resolved.
In order for the staff to complete
- its revie~ expeditiously, *we request that you provide the information requested in the ~nclosure within 45 days of receipt of this letter.
The reporting and/or re.cordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is.*not required under _P.L. 95:..511,
Enclosure:
Sincerely, Original signed by John A. Zwolinski, Chief
_Operating Reactors Branch #5 DiVisfon of Licensing DISTRIBUTION Request for Additional Information Docket BGrimes JPartlow RGilbert CJamersbn JZwolinski ACRS (10)
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket Nos. 50-237/?.49 LS05-85-06-037 Mr. Dennis L. Farrar Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Farrar:
July l, 1985
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - REVERIFICATION OF POST-FIRE ALTERNATIVE SHUTDOWN AND SCHEDULAR EXEMPTIONS FROM 10 CFR 50.48 (APPENDIX R) REOUTREMENTS Re:
Dresden Nuclear Power Station, Unit Nos. 2 and 3 The staff has reviewed your submittals dated August 10, 1984 and March 1, 1985 which proposed revisions to your approach for post-fire alternate shutdown and requested schedular exemptions from 10 CFR 50.48 requirements.
During the course of this review, the staff found that additional information is required in order that these issues may be resolved.
In order for the staff to complete its review expeditiously, we request that you provide the information requested in the enclosure within 45 days of receipt of this letter.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Enclosure:
Request for Additional Information cc w/enclosure:
See next page SincJZ+- z__QJ,
J~. Zwolinski, Chief Operating Reactors Branch #5 Division of Licensing
ff' Mr. Dennis L. Ferrar Commonwealth Edison Compan,v cc:
Robert G. Fitzgibbons Jr.
Isham, Lincoln ~ ~e2le Three First National Plaza Suite 5200 Chicago, Illinois 60602 Mr. Doug Scott Plant Superintendent nresrlen Nuclear Power Station Rura 1 Route #1
~orris, Illinois 60450 U. S. Nuclear Regulatory Commission Resident Inspectors Office Dresden Station P.ura 1 Route #1 Morris, Illinois 60450 Chairman Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 Regional Administrator Nuclear Regulatory Commission, Region IJJ 799 Roosevelt Street Glen Ellyn, Illinois 60137 Gary N. Wright, Manager Nuc1ear Facility Safety
!11inois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704 Dresden Nuclear Power Station llnits 1, 2 and 3
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REQUEST FOR ADDITIONAL INFORMATION nP.ESDEN NUCLEAR POWER STATION, UNITS 2 ANO 3 DOCKET NOS. 50-237/249 REVERIFICATION OF POST-F!PE ALTERNATIVE SHUTDOWN AND SCHEDULAR EXEMPTIONS FROM 10 CFR 50.48 (APPENDIX R) REOUiREMENTS References
- 1.
Commonwealth Edison Company's (the licensee) submittal dated August 10, 1984 relating to Appendix R Reverification Results for Dresden Units 2 and 3.
- 2.
IE Il"!fonnation Notice No. 85-09, "Isolation Transfer Switches and Post-Fire Shutdown C'ilpability 11 dated January 31, 1985.
Requested Information
- 1.
Provide a summary of your reverification findings with regard to all associated circuit concerns.
With regard to common power sources, your response should address the elimination of hiqh impedance faults, i.e.,
opening of a common power supply (both safe and non-safe shutdown loaQs) circuit breaker prior to indiv.idual breakers of associated non-safe shutdown loads opening due to fire damage.
Additionally, your summary should include Interim Compensatory Measures (ICMs) and permanent fixes in this regard, as needed.
- 2.
Provide a summary of your reverification findings with regard tQ elimina-tion of the electrical isolation deficiencv as identifed in Referel"!ce ?.
Your sulTITiary should include ICMs and permanent fixes as needed.
- 3.
Provide the current status of your proposed modifications for overcoming the potential adverse consequences that result from a postulated fire coincident with loss of offsite power (see Pages 2-19, 2-21, 2-?? and 2-23 of f~closure II, Reference 1 for a description of the proposed compensating features in this regard).
Indicate whether your existing request (P.efprence 1), that a fire coincident with a loss of offsite power at the Dresden site not be assumed during the period August 1984 -
March 1985, shnu1d he revised to include the additional period until modifications are made to cope with a loss of offsite power.
If so, revise the request as ~pprnpriate.
)
- 4.
Correct apparent conflicts between Table 2.1-2 (Reference 1, Enclosure III) and Section 6.2.3 (Reference 1, page 6.2-2) for the entries listed for shutdown paths for Fire Zone 11.3 (Units 2 and 3 cribhouse). Also correct Table 2.1-2 as necessary Tor the shutdown path for Fire Zone 8.1 (turbine oil storage area).
- 5.
For a fire in the Fire Zone 9.0.C (the swing diesel generator 2/3 room),
until the four proposed modifications are completed, (See Reference 1, Enclosure II, Table 2, Pages 2-20 and?.-?.!) i~dicate whether shutdown paths E and F for Units?. and 3 shutdown, respectively, are_available in the interim period. These have been listed as long term shutdown paths in Tables 2.1-2.
Indicate why it is necessary to utilize mechanical cross ties, procedures and Unit 3 equipment and power for achieving Unit 2 shutdnwn and vice versa for Unit 3 shutdown in the interim.