ML20136H851

Forwards Request for Addl Info Re Util 840727,0831 & 850124 Requests for Exemption from 10CFR50.48 & App R Re Safe Shutdown Capability Reassessment

ML20136H851
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	01/07/1986
From:	Norris J Office of Nuclear Reactor Regulation
To:	Farrar D COMMONWEALTH EDISON CO.
References
NUDOCS 8601130003
Download: ML20136H851 (4)

Text

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January 7, 1986 Docket Nos. 50-295 ISTRIBUTION

, and 50-304 E ~ Q.r ocket File PAD-3 Rdg

! NRC PDR H. Thompson

Gray File OELD i Mr. D. L. Farrar E. Jordan B. Grimes

. Director of Nuclear Licensing J. Partlow J. Norris i Connonwealth Edison Company C. Parrish ACRS 10 l Post Office Box 767 J. Stang i j, Chicago, Illinois 60690 l

Dear Mr. Farrar:

l

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - EXEMPTION FROM 10 CFR 50.48 i AND APPENDIX R - ZION NUCLEAR POWER STATION UNITS 1 AND 2 I  !

j The continuing review of your request for certain exemptions from 10 CFR l 50.48 and Appendix R to 10 CFR 50 indicates that additional information, contained in the enclosure, is required before we can complete our review.

j Please respond in a timely manner.

I Sincerely, l ,

/s/JNorris J

3 Jan A. Norris, Senior Project Manager i

PWR Project Directorate #3 i Division of PWR Licensing-A

Enclosure:

As stated -

cc w/ enclosure:

See next page b ,

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i Mr. D. L. Farrar

Commonwealth Edison Company Zion Station cc:

Robert J. Vollen, Esquire Mr. Michael C. Parker, Chief 109 North Dearborn Street Division of Engineering

. Chicago Illinois 60602 Illinois Department of Nuclear i

Safety Dr. Cecil Lue-Hing 1035 Outer Park Drive, 5th Floor Director of Research and Development Springfield, Illinois 62704 Metropolitan Sanitary District of Greater Chicago 100 East Erie Street Chicago, Illinois 60611 Mr. Phillip P. Steptoe Isham, Lincoln and Beale Counselors at Law Three First National Plaza Sist Floor Chicago, Illinois 60602 l Susan N. Sekuler, Esquire Assistant Attorney General Environmental Control Division 188 West Randolph Street, Suite 2315 Chicago, Illinois 60601 Mayor of Zion Zion, Illinois 60099 Illinois Department of Nuclear Safety ATTN: Manager, Nuclear Facility Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704 U.S. Nuclear Regulatory Commission .

ResidentInspectors}0ffice 105 Shiloh Blvd.

Zion, Illinois 60099 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 -

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o,, UNITED STATES

[ p, NUCLEAR REGULATORY COMMISSION 5 wAss NoTow. o. c. 20sss l

%...../ THE OFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR INFORMATION (RFI)

APPENDIX R REVERIFICATION AND EXEMPTION RE0 VESTS COMMONWEALTH EDIS0N COMPANY ZION NUCLEAR POWER STATION, UNITS 1 AND 2 DOCKET NOS. 50-295 AND 50-304 The following information is needed to evaluate the AppendiW'R exemption requests made in the Licensee's July 27, 1984 submittal titled " Safe Shutdown capability meassessment and Proposed Modifications - 10CFR50, Appendix R."

Subsequent amendments to the submittal included revisions to Section 6 dated August 31, 1984 and to Section 1 dated January 24, 1985.

(Note Page and figure numbers in this RFI refer to those of,the Licensee submittal.)

280.1 Provide drawings and detailed descriptions to clearly illustrate the arrangement of all ceiling and duct-mounted detectors for the Main Control Room (Fire Zone 2.0-0, page 7-8), and the Auxiliary Electric Equipment Rooms (Fire Zones 5.6-1 and 5.6-2, page 7-14 ) . The information should, as a minimum, include the location of detectors a relative to ceiling heights, EVAC registers, exposed ceiling beams and other ceiling projections, and fixed combustibles. Verify if these detectors are selected and installed in accordance with NFPA-72E.

280.2 The statement is made on pages 7-13 and 7-71 that structural steel supporting exterior boundaries are not protected by " fire-rated materials" because there are no adjacent safe shutdown components.or exterior fire hazards. Verify that failure of exposed structural steel, due to an' interior fire, will not affect any other required boundaries or safe shutdown equipment.

280.3 Provide additional information to substantiate that installation of a fixed suppression system in the Auxiliary Electric Equipment Rooms (page 7-17, Section 7.3.5) has a potentially detrimental impact on safety due to freezing of instrumentation and relays should an inadvertent operation of the suppression system occurs.

280.4 Provide additional information with regard to routing of safe shutdown cables in the Puel Building fire area (page 7-25, Section 7.4.4). The information should include, as a minimum, separation between redundant circuits and identification of intervening combustibles. Also include fire loading in the area of the routing.

280.5 Provide additional information to substantiate that redundant centrifugal charging pump and RHR pump cubicles meet the criteria of Appendix R,Section III.9.2(a). The statement made on pages 7-27 and 7-34 indicatas that unrated access doors, with sheet metal transons, are provided for these cubicles.

280.6 Verify that intervening combustibles on the 560-ft elevation (page 7-31) in the vicinity of the Ccw pumps consist only of two groups of four cable trays and that each tray has a solid bottom and is provided with a tray cover.

280.7 Confirm that all five CCW pumps located in close proximii.y on elevation 560 f t (page 7-31) are not subject to damage from fire suppression activities or from the rupture or inadvertent operation of the installed CO2 local fire suppression system.

280.8 Verify that the Licensee proposes no automatic suppression (partial or full area) in Fire zone 11.3-0 (Figure No. 7.4-3) containing redundant Unit 1 centrifugal charging pump power feeds, motor driven AFW pump power feeds, and the turbine-driven AFW pump. This information will be used to evaluate the Licensee's request for exemption from the ,

requirements that full area detection and automatic suppression systems be installed and from the required 20-ft separation between redundant circuits for the Auxiliary Building fire area.

280.9 Estimate the time in which the hot gas layer from an affected Main control Board will reach the unaffected Main control Board. This question is associated with the' scenario of smoke spread described on page 7-54, Section 7.5, between the affected and unaffected Main control Boards in the control roce.

280.10 Section 7.8 (page 7-69) describes the basis for exemption from the requirements that exposed structural steel forming part of a fire area boundary be protected commensurate with that required of the barrier.

To facilitate the staff's review, provide the following:

a. Provide the burn rates at which the calculated fuel load (minutes) in Table 7.8-1 was determined. Confirm that these rates are valid for the combustibles within each sone,

b. Evaluate the effects of localised heating due to direct exposure to fire plumes frca local combustible packages.

. c. Confirm that the time-temperature profile of ASTM E-119 is '

conservative' relative to the heat release rate of the installed combustibles and to a ventilation controlled fire.

280.11 The description of the Auxiliary Building fire area in Section 7.4.1 (pages 7-20 through 7-46) identifies several non-rated fire barrier components in the area boundary wall. Provide the technical basis for acceptability of each non-rated component as well as identify what is deficient about such a component that prevents it from being a 3-hour

, rated barrier.

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