ML17195A722
| ML17195A722 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 02/27/1985 |
| From: | Zwolinski J Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| References | |
| LSO5-85-02-019, LSO5-85-2-19, NUDOCS 8503050074 | |
| Download: ML17195A722 (5) | |
Text
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Docket Np~ ~0-237*
LS05-85-02-019 Mr. Dennis L. Farrar Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Farrar:
February 2-Z-: 1985. *
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - INSTALLATION OF A LIQUID HYDROGEN STORAGE TANK AT DRESDEN Re:
Dresden Nu~lear Power Station, Uriit No. 2 Recently the NRC Headquarter~ and Region III staffs became a~are of Commonwealth Edison Company's (CECo) intent to install *a liquid hydrogen ta.nk on the Dresden*
site as the source of hydrogen for the Dresden 2 Hydrogen Water Chemistry (HWC) program for control of lntergranular Stress Corrosion Cracking in Reactor Coolant Boundary piping.
CECo had performed an analysis of this installation
. and determined that it could be implemented without staff review under the requirements of 10 CFR 50.59.
In o*rder to confirm tha't this could be *done under 50.59, the staff examined the documents upon which CECo's determination was based.
At this. time,.the staff is not convinced that the installation.can be implemented.under 50.59 and, indeed, after a* review of CECo's do.cumentation; has determined that*
further information is needed relating to the stora.ge. of this explosive material in close proximity to the safety-related structure*s of Dresden 2.
. We request, fh~refore~ that you provide ~esponses to the questions listed in the enclosure within 30 days of re~eipt pf this letter.*
The information requested in thi~ letter ~ffects fewer. than t~n resp6ndents~ *
. n
Enclosure:
Request for Additional Information
- cc:
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- JZwol inski 2/-i"-/85 s'incerely,
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John A. Zwolinski, Chief Operating Reactor_s -.Branch No. 5
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Mr; Dennis L. Farrar 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 Conunission Resident Inspectors Office Dresden Station Rural Route #1 Morris, Illinois 60450 Chairman Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 U. S. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:
Regional Radiation Representative 230 South Dearborn Street Chicago, Illinois 60604 James G. Keppler, Regional Administrator Nuclear Regulatory 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 February 27, 1985
REQUEST FOR ADDITIONAL INFORMATION DRESDEN NUCLEAR POWER STATION, UNIT NO. 2 INSTALLATION OF A LIQUID HYDROGEN STORAGE TANK AT DRESDEN 311.5 (Section 2.2.3) The H2 tank failure analysis indicates that the Dresden safety related structures are designed to withstand overpressures of 6.3 PSI without damage.
Figure 2 of your analysis shows that with Pasquill "D" stability (wind velocity u is not specified) and with a vapor cloud drift of 650 feet, the TNT equivalent of the flantnable hydrogen mixture is 30,000 lbs of TNT.
The distance from the center of this cloud to produce an overpressure of 6.3 PSI is stated to be 404 feet.
Indicate if this over pressure is the peak positive incident pressure (Ps 0 ) or the peak positive normal reflected pressure (Pr) as defined in the Department of the Army Technical Manual TM 5-1300 "Structures to Resist the Effects of Accidental Explosions" - (Reference NO. 1 of Standard Review Plan 2.2.1 - 2.2.2 Identification of Potential, Hazards in Site Vicinity). Indicate the H2 - TNT conversion factor used and its basis.
311.6 (Section 2.2.3) Provide a drawing of the flammable portion of the postulated hydrogen cloud path on an up-to-date plot plan of the Dresden Nuclear Station (assuming PASQUltL "F" and wind velocity (u) = 1 meter/second). Indicate on a scaled "Side View" of the Dresden complex the path of the flammable portion of the hydrogen plume considering the bouyancy of the hydrogen gas.
Indicate the distance from the centroid of the hydrogen plume explosion to the nearest vertical and horizontal surfaces of safety related structures.
311.7 (Section 2.2.3)
Figur~ SK-2 Shows the H2 truck delivery routie.
Indicate the maximum quantity of hydrogen contained in the transport vehicle. Figure SK-2 also indicates a 30,000 gal fuel oil storage tank and a 3 ft earth dike surrounding it, near the proposed location of the H2 storage area.
Provide an analysis of the peak positive normal reflected pressure on the oil tank and dike and the Thermal Flux (Kw/M2) on the oil storage tank due to a detonation and a fire at the H2 storage.
In the event of failure of the dike indicate the flow of released fuel oil based on the topography of the site
~round the fuel storage tank.
311.8 (Section 2.2.3)
In the event of a fire in the fuel oil storage tank calculate the Thermal Flux on the Hydrogen Storage Tank.
Indicate the consequences of a fuel oil fire on the evaporation rat~ of hydrogen liquid in the storage vessel.
311.9 (Section 2.2.3) Calculate the Pr on the roof and walls of the building containing the units 2/3 control room and other safety related structures from a hydrogen cloud detonation considering the buoyancy of the gas and assuming Pasquill 11F 11 stability with a wind speed of 1 M/sec, and a wind direction towards the units 2 and 3 control rooms.
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311.10 (Section 2.2.3)
In the event of a fire at the hydrogen sto~age facility, calculate the Thennal Flux on the surfaces of safety related structures.
Indicate the duration of the fire.