ML20213C833

Reports Preliminary X/Q Estimates for WNP-2 Using Reg Guide 1.XXX Model W/Mods for a Desert Location.Requests Info Re Part 100 Eval

ML20213C833
Person / Time
Site:	Columbia
Issue date:	12/18/1978
From:	Markee E Office of Nuclear Reactor Regulation
To:	Soffer L Office of Nuclear Reactor Regulation
References
CON-WNP-0246, CON-WNP-246 NUDOCS 7812270022
Download: ML20213C833 (2)

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DEC 131978 rS10RANDUM FOR: Len Soffers Leader i Section B

, Accident Analysis Branch ,DSE FROM: Earl H. Markee,Jr., Leader Meteorology Section Hydrology-Meteorology Branch, DSE SL%'ECT: PRELIMINARY X/Q VALUES FOR W;iP-2 WehaYebeenehaluatingtheatmosphericdispersionconditionsforthe Washington Public Power Supply Systen Buclear Project No. 2 (WNP-2).

At pmsent we have not completed our evaluation of the dispersion model presented by the Project in their ESAR. They used a direction-dependent model and assumed different stability classifications and parameters than ours. Depending on their response to our Q-l's, we should determine by Q-2's whether we can adopt their model. ,

In the meantime we hNe made our own preliminary X/Q estimates for the site.usins the Regulatory Guide 1.XXX model with modifications for a desert location. Our 0-2 hour exclusion boundary estimate .is about a factor of two higher than the Project's. (Based on the available information in the FSAR,we think that this difference is chiefly due to the atmospheric Project's notcondittent.

including)aWe stability classification our current for extremely stable note that exclusion boundary esti= ate is 50 percent lower than our SER Co'1struction Permit

- 'f value. Because of the difference between our estimates and the Project's, Dave Lynch (LPM) has asked that our branches estimate preliminary doses for the WNP-2 to identify early any potential problems.

Below are the X/Q Yalues we hNe estimated for short-tem ground-lehel releases; please consider these as preliminary estimates only.

Tice Period Distance (meters 5 X/0 (sec/ meter )

3- TTemo U 0-2 hours 195b 1.7xlb-4 0-0 hours 4827 3.2 x 10-5 g 3-24 hours 781227O@> 4827 5 n 1-4. days 4827 2.8 x 1.4 x 10- 10 5 4-30 days 4827 5.3 x 10-6 oprics >

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Lon Soffer i As discussed between Peter Tam and John Goll on 11/17/78, there are no special release modes or time periods to consider.for the WNP-2

, assessment. Per Charlie.Ferrell, we used the circular exclusion

,' boundary distance of 1950 meters for all directions, and 4827 meters for the LPZ. Please inform us if you determine any special release modes or any changes in the exclusion boundary.

PleaseinformmeoftheoutcomeofyourPart1boevaluation. John Goll (x27288)isourcontact.

! Orisical~51cned by Jchn T. Goll.s-Earl H. Markee, Jr., Lesder

,f heteorology Section i Hydrology-Meteorology Branch Division of Site Safety and Environmental Analysis cc: 'R. Denise R. Vollmer L. \tu1 man

• W. Houston P. Tam l C. Ferrell -

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j Accident Analysis Branch , DSE i FROM: arl 11. Markee, Jr., Leader F. eorology Section 1 ology-Veteorology Branch DSE

SUBJECT:

PRELI. !ARY X/Q VALUES FOR WI,'P-2 WehaYebeenevaluatingthe tmospheric dispersion conditions for the Washington Public Power Supp System Nuclear Project rio. 2 (WNP-2).

At present we have not complet our evaluation of the dispersion model presented by the Project i their FSta. Depending on their response to our Q-l's we should termine by Q-2's.whether vte can adopp their model.

In the meantime we have made our own liminary X/Q estimates for the site. Our estimates are.about a fa r of two higher than the

! Project's. .(Based on the available inf . tion in the FSAR, we L think that this difference is. chiefly due the Project's not considering extremely stable atmospheric con tions.) He note that our current estimatas are 50 percent lower th our.SER Construction Permit values. .Because of the difference bet our estimates and the Project's, Dave Lynch (LDM) has asked that.ouAbranches estimate preliminary doses for the WflP-2 to identify earlyToy potential problems.

l l Below are the.X/Q values we have estimated for short-t ground-lehel I releases; please consider these as preliminary estimat only.

Time Period Distance X/Q (se .eter3)

O-2 hours 1950 1.7 x 10 0-8 hours 4827 3.3 x 10-8-24 hours 4827 2.8 x 10-5 l

1-4. days 4827 1.4 x 10-5 4-30 asys 4827 5.3 x 10-6 l

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L Soffer As dis sed between Peter T m and John Goll on 11/17/7S, there are no speci release codes or time periods to consider for the WNP-2 l asses Per Charlie.Ferrell we used the circular exclusion boundary di .of 1950 meters for.all directions. and 4827 meters for the LPZ. lease infom us if you determine any special release modes or any cl. in the exclusion boundary.

John Goll (x27283) s our contact.

Earl H. Markee. Jr., leader

!!eteorology Section .

Hydrology-Meteorology Branch tvision of Site Safety and Environmental Analysis ec: R. Denise Re Vollmer L. Hulman W. Ilouston Pe Tam C. Ferrell J. Goll M. Lynch l

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