ML20207C513

Applicant Exhibit A-34,consisting of EGG-1183-1670, Structure Shielding from Cloud & Fallout Gamma Ray Sources for Assessing Consequences of Reactor Accidents, Dtd Dec 1975

ML20207C513
Person / Time
Site:	Seabrook
Issue date:	05/17/1988
From:	Burson Z, Stobie G, Stuart T EG&G, INC.
To:
References
OL-A-034, OL-A-34, NUDOCS 8808090254
Download: ML20207C513 (6)

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I DOCKUED US4PC

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SlRUCTURE SHIELDING FROM CLOUD AND FALLOUT GAMMA RAY SOURCES FCR s

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t ASSESSING THE CONSEQUENCES OF REACTOR ACCIDENTS NUCLEAR REGULATORY C0'*1 MIS 310h 7

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~~" ~ [ ,. h i% L Approved for Publication ~

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T. P. S t u ar t , Manager itadia::en and Environmental Sciences Dept.

a Tais Document is ~ " ~ '**""." **.~ C.*' O C 1'? v il.1.r J'"'O. - .

UNCLASSIF1ED ***

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• Consultant to EG AG, F rafessot', Nuclear Enginee ring, University'of

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Prepp. red by EGAG for the U. S. Energy Roscarch and Development Administration under Contract No. E-(20-1) .* *83 g , c ,, ,, .. . - - '- '

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a F. Complex Structures (Large Apartment and Office llulldined The computational procedures presented in Iter. 20 are capable of predicting protection. factors in any strur:ture, no matter how complex. /s was mentionett before, the emphasis for Civil Defense spplications has been to search for shelter locations having protection factors of 20 or more. Those locationJ ure usually ft,und in all base-ments and in most other locations in multi-story and complex structures.

Sorne experiments3***'*"

have been performed to evaluate the fallout radiation protective qualities of larger structures. PF values of 20 and above (away from doors and windows) were measured in most locations in multi-story cumplex structures.

i The following reduction factors are recommended as repre-sentative of the type of structure indicated:

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Type Structure fleduction Factors

• 3-4 stories,5,000 to 10,000 ft*  !

per floor l- upper floors 0.05 f basement 0.01

, multi-stories - more than 10,000 ft" sJ per floor - upper floors 0. 01

- basement 0.005 An inventory of a'vallable shelters in this category la also l maintained; in the National Shelter Survey I.'ata File.

> n G. Summe'ry, Structural Shielding front beposited fladioactivity

\ li The reduction factors in Table 8 fnr gamma radiation from uniform deposited radionuclides from a reactor accident are recommenJed i

as representative of the type of structure or situation indicated. No

• l modifying factors were applied.

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• Away from doors and windows.

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_ _ _ _ _ _ _ _ = - - -

'p Tablu 8. Itepresentative reduction factors for deponited radioactiv.'y, 5tructure and/or 1.ocattun ite duction l' actors ,

I m above a hypothetical infinite _ smooth plane 1.90 1 m above orcinary ground 0.70 .

I m abose center of 50-ft roadway half contaminated 0.55 I

. cars, pickups, buses, and trucks on 50-ft road road fully contaminated 0, 5 road 50'". contaminated O. 5  ;

road fully decontaminated 0.25  :

Trains 0. 4 I & 2 story wood frame homes (no basement) 0, 4

1. & 2-story block or brick homes (no basement)

0. 2

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!!ame basem:nt - 1 or 2 walls fully exposed O.1 * .

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- 1 story, less than 2 ft of 0.05*

basement walls exposed O - 2 story, less than 2 ft of hasement walls exposed 0.03*

3 or 4-storv strtictures, 5,000 to 10,000 ft" per Goor first and second doors 0.0$*

basement 0.01*

multi-story strvetures, > 10,000 ft per Goor '

upper Goors 0.0l*

basement ,

0.005*

• Away from doors and windows. .

The reduction values are relative to 1 m above a hypothetical, uniform initrdte sanooth plane naving the same source concentrations.

The values given are only representative and are not to be taken as exact. Different values will result because of wide variaticus in con- ,

structional details and topography.  !

- I For a more extensive bibliography of fallout radiation shielding . -

studles , the reader is referred to !!cf. 31.

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D. Simple Structures Clomi t tutside.

1.

The G factor for smrell houses s': nearly 1. na the effective .

radsua or a few ineters is small enmpared to the mean free path in

• air.

I'or atte nuntion consider a wooden frame house with a roof ,

anel ceshng consisting of 1/4 in, wowl or asphalt shingles 3/4 in, of wood nhenshing and raf ters, and I /2 in, of gy psum board, for an aver: ige

.T * :1. 2 'g/crM. hence A = 0. 9 Assume the w:.lls are wood sheathing (

siding, studa, and gvpsum board erguivntent to .5 = 3. 4 g/cm'. and A ' O. !* approximatt tv. ibors and wmdows will have little effect. .ind' stucco has only slightly greater ' attenuation. Thus the reverage reduction factor for an above ground room in an ordinary wooden frame house is about 0. 9. .

A 8 mall house with a wooden roof but masonry walls provides better protection. Let us assume half of the 2r solid angle of the '

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hemit.phere is subtended by the roof, and the other half by the walls.

I*or 8 in, thick hollow concrete block walls plus gypsum wallboard.

Ke 28 g/cm#. hence A = 0. 38 The overall reduction ' actor is then O. 5 (0. 9) + 0,5 (O. 381 a 0. G4. Windows an'l doors will diminish the e

protection. but a person in an in'erior room, or on the first Goo'r of a' t*o-story house, will have better protection than the values given above, l'our-inch thick brick facing on a frame house will provide almost as much protection as the concrete block (X = 22 g/cm 8 . A

• 0.48). The '

reduction factor which inclueles the roof contribution is then 0.69.

liasement[s provide some protection against cloud gamma radiation, although not as much as for fallout. The reduction can be estimated by; .

considering the frac:sonal solid angle (of 2r> steradiens) subtended by the roof, the walls, and the ground, and ascuming the attenuation factor through the ground as essentially zero. Thcn for a typical house of effective radius lt (t. basement depth U ft. and first floor wall height j 8 ft. the fraction subtended by the rocf is 0.38. the fraction subtended by the walla is 0.23 t.nd the fraction hv the ground is 0.38. The weighted reduction factor fob the wooden frame house is then about 0.56 while the weighted reduction' factor for the mnsonry-wall, single-story.

house is ahuut 0.43. for a person at the center of the basement in each cose. Off center locations will be nearly the same.

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Table 10. Representatne reduction factors for cinud source.

Structure Location _ Reduction Factor Outside - 1. 0 Vehicles 1. 0 i

Wood frame house,' no basement 0. 0

i Masonry house, no basement C. 6 1

Dasement of wood frame house 0, 6 B

Basement of masonry house ' b. 4 Large office er industrial-type building d.2c, less away from doors and windows ,

,I The above reduction factors are relative to an unprotected position ou'tside. The values suggested arc estimates for the general case and are probably representative of the upper (conservative) range for the designated class of structure. I,

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O EXHIBITS: - s-s -- mour0Rv COMniss10N APPLICANT

..,============================n===========================;

ATOMIC SAFETY AND LICENSING BOARD.,

In the Matter of: )

)

EVIDENTIARY HEARING: )

) DOCKET: 50-443-OL PUBLIC SERVICE COMPANY OF ) 50-444-OL

) 0FFSITE EMERGENCY NEW HAMPSHIRE, et at ) PLANNING

)

(Seabrook Station, Units 1 and 2) )

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l l i LOCATION: CONCORD, NEW HAMPSHIRE DATE: May 16 through 20, 1988

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HERITAGE REPORTING CORPORATION O om ,,,,,,,. .

1224 L Street, N.W., Suke 600 Wastdagton, D.C. 20405 I (202) 628-4488

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