ML20072L643

Forwards Final Survey of R-3 Reactor Bay After Removing R-3 Reactor Biological Shield.Area Above Crane Track Shows No Greater Deviation of Radiological Cleanliness than Area Below Crane.No Swipes on Area Above Crane Necessary

ML20072L643
Person / Time
Site:	North Carolina State University
Issue date:	03/16/1983
From:	Cross R North Carolina State University, RALEIGH, NC
To:	Peery W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20072L642	List: ML20072L640 ML20072L643
References
NUDOCS 8303310400
Download: ML20072L643 (23)

Text

. .

c NORTH CAROLINA STATE UNIVERSITY ,

SCIIOOL OF ENGINEERING DerAnruENT or NUCLEAa Excistrasso Noctum nucwn Paoc"* March 16, 1983 i Bos 5636 Zar 27650 1

i

., I Mr. William Peery i Materials and RAD Protection Section i Division of Engineering & Technical Inspection i ir U. S. Nuclear Regulatory Comission Region II X ~;- ' 101 Marietta Street, Suite 3100 l Atlanta, GA 30303

)

Dear Mr. Peery:

I ,

Enclosed is a copy of our final survey of the R-3 Bay after re-moving the R-3 reactor biological shield. These swipes were taken of the walls below the track of the overhead crane, the floor, all hori-4 l

L zontal surfaces on the walls, the trenches relating to the reactor, and the fuel storage pit. All swipes were " clean"; i.e., the DPM (s-y) count

' was less than 85. These swipes were taken of individual areas of less than 10' square since the smaller size better fitted the octagon walls of the Bay. .

Per our conyersation relative to the area above the crane track

'r vs the area below, I conclude the area above the crane track would not I j show any greater deviation of radiological cleanliness than did the area i

below the crane. Hence, it is not necessary to swipe the surfaces above the crane track.

l A copy of this letter and enclosure has been sent to Mr. Peter FQ i Erickson in Washington.

1 Very truly yours,.

~

g /'L' 7 RDC:1pe Robert D. Cross

> Reactor Health Physicist belosure:

s R-3 Demolition Final Survey s

8303310400 830329 PDR ADOCK 05000111 W '

PDR l

l .

O R-3 DEM0LITION FINAL SURVEY Page: Final 1:

Items 1 thru 20

Storage holes in walls.

Items 21 thru 32: Relate to equipment associated with the i

Gamma Facility l Pages: Final 2 thru 6:

1

' Items 1 thru 191: Swipes of R-3 Bay walls and pipes on these walls.

NOTE: R-3 Bay is octagonal in shape. See Drawings 1 thru 4. Side A has 4 windows. Each side was divided into thirds both horizontal and I

vertical, about 8' squares. The vertical wall, each side, is Number 1, 2, 3 ... from left to right. Hence, for Side A, the numbering is: 1A, 2A,

. 3A, 4A, etc. The horizontal pipes on each side, each vertical section are t numbered consecutively from 1 up, floor to crane track. Hence for Side lA,

!, the pipes are IAH1, IAH2, ...., 4AHS, 4AH6, ...., 7AH7, 7AH8 .... This i system is followed throughout the Bay walls.

l Page: Final 6:

Items 192 thru 210: These swipes were taken on horizontal sur-faces under Wall Source Storage Holes 1 thru 20, under beam catcher holes in the walls; on shelves attached to the wall, and the sink.

Page: Final 7:

I Items 211 thru 236: Swipes of the R-3 Bay Floor exclusive of the j trenches and biological shield area.

Page: Final 8 & 9 - See Drawing #5:

e l Items 1 thru 70: Swipes of the trenches associated wnh the R-3

-l ; reactor and the base of the biological shield.

! Page: Final 9 & 10 - See Drawing #5:

k!

Items 71 thru 98: Swipes of holes in fuel storage pit.

l Page: Final 11 - See Drawing #6:

i Items 1 thru 14:' Swipes of floor from platform within R-3 to Loading Dock outside of building.

All swipes indicated above were not greater than 85 DPM for beta-gama contamination and 0 DPM for alpha. On this basis, it is suggested that all surfaces above (over) the track of the overhead crane are, likewise, " clean".

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Swipe Gross Bkgd. Eff.

No. Location Counts GCPM a or 8 NCPM a or a DPM I l

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!' R-3 DEM0LITION PAGE 1 Swipe 1.og Swipe - Gross Bkgd. - Eff.

No. ,

location Counts GCPM a or s NCPM a or B DPM

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2 th HL . .

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1 R-3 DEM0LITION PAGE .5 i Swipe Log .

1 Swipe . Gross Bkgd. Eff.

No. Location Counts GCPM a or e NCPM a or 8 DPM

._ . _ . .. .. 51.. . .. 609T .. .

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.; R-3 DEM0LITION PAGE 4 Swipe Log i ~

i Swipe Gross Bkgd. Eff.

No.

Location Counts GCPM a or a NCPM a or 8 DPM

_.  % C3 . Hf 9 61 . M__ S1 .~ 0077 .. _ _ _ _ _

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i R-3 DEM0LITION PAGE s-

1. N Swipe Log Swipe Gross Bkgd. Eff. _

No. Location Counts GCPM a or B NCPM a or B DPM I31 V2. . . 68 68 (90 . O. . .00GC. .. .-

. e3s , m _. ._ . 65 . 55 . o -...A o22.

839 V5 - , . . . .. (0O ,b0 . 0 .-. - -- - . - . _ . . . ..

I40 F8 - .. 52 S .-- . _ _ O -.

. . - 1Y . . . q

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. . b 2~ , b S 14 2 .Hl. .. ._ .

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2-

<4S 9. . . . . 73 .

73 . / 3 _ _ _. . _ _eg/

146 . x e -. . .. . ._ _ . 60 (p0 . V . D. W

. 55..

. , M1 4 4.. - - _ . . . 65 60 - O .00 9

. . 148 . . . .kia . _ _ . . . _ 8-_ . . ... . 68 . _ - . - O

. . ._ 149 . _ qL_ . _ _ . _ . . . ._ ___. 6 d_. . ._ _ 3 ' ' E

. . <ro . . 92_ E _ ... 14 .. J  : 2-

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. .. _ . . - - _ . _ . . . . ~ . . _ _ .

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l

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.. u _

l

i Fus.

R-3 DEM0LITION PAGE G j Swipe Log

~ ' '

Swipe . ' Gross Bkgd. Eff.

No. ,

Location Counts GCPM a or a NCPM a or 8 DPM

_ . .__ . .._. . /0 7 . .. . __ . # 4 . H 3 . (o 3. 1. 63 .G0 m 3 .0cv2 S-JG B. _ -_ . tr1-- . . .. . 51. . . .__. SV ._ .

~ -

_ _-.. / k 4 H3. . . M8 - M l? .-

~

~

' ~

- s.70- ___ __ _ H L _ .. _ . ___. _ . . __ . 5~'l . S_1 _ _ _ _ . . _

' ' 7t __ . . .._ H5'E ___. _. 6 '2 _j 6_7- i .

2 "A . . _ . _

L 7Z_ __._ _ _-__._ _ . 3 2 __ _ . _ -. .1( . ___ i 7/ - _ . . ... ll . l$. . _

_ _. :.i /73 ... . H3. . _ . . N _ .__.f f__._ " '

. . 114 . . . . - - kB . .. --. ._. . & f. Gf 5 ~2

. _ ., 175" __.. _. . H3 . _. . (e .3 _.-_G_ 3____ __ . _ .

3 5 ._

_ . 2 7(e - . . . . . tli . . .. _ . U9.- . . _.N.T_ -. )( .-

~

Y ~.__.

_ _f2.7 ____.__.N2._..__... .__ f l G_3 laos. . _.. . .3 ,0o72. X 178 18 3_ _. ___. /- o i do _. _ __ _ . O ._._~

11 9 ut__ l M_f M9 .

. .._.~

1.90 Hk.- 47 l 47 _.. -

~

l.B1 'LG_ _ -.; _._._ & 'I I G 'f 'f. . ....l

~

' 122 . H (o ._.____ - TI ~U . /l. /9

~

' .18.3 _k7 5-f '

s7 . _ _ . _ _ .

~

IM _ H8_ . '7 7 l 7 f_..,__. - /T ..

.. ._ _ 2 .S I87 .H 9 _ __ . _ . -- _.h O '

I la O -__.---.O .

~

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f 9-F .HH__ W .FY 'R98 "

. . . , 607f .. -

_' / 98 ff9 6l M .___u... .

181 _xt2  ! 5 2- S 2.

I 19n .Hf)._. ca..). 63 _

.3 ._ _g 1.91 _ ___._ ___ . lHM_ __5_f S_f_._ O (___ _. . _ . _ y f _ _ _ _ __ -

arko_ _ _ .coig, _ _. _ _.

k A-831 l4 L.. _J-.xo.W. . 9TSS. thc0. l-2._ __584  ! S4 -

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6. 6' _j._ _ 4 _( . F Q_ ,

. ser .t. c u e m e w i. , a - 4 so . 5o - -

___ ... J 9 (a .WGcr uyo ca \4.us s-G . (0.(___ l l_._.. ) *2. _

_ _ . . _ _ . . . .( 9 7. __. " oeen Cnene D . 5 ~)- . F 2- . ~

--~

.. ____.__.._ 19 % S woest. "

Af n7-S. M T _.. . M i . _ .

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67 7 /A

~2 os . u m a sa ceawn H 56 53 O O l 207 u po m s, u ce.it z o f8 f8 8

'20% "

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29 - " e, d .~

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C.

i

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R-3 DEM0LITION PAGE r Swipe Log

~ " ~ ~ ~ ~

Swipe ' Gross '. _ _ .

Bkgd. Eff.

No. Location Counts GCPM a or s NCPM 'a or a DPM

, ~5. g 3 . _. . . . L _ _ . .._._ _ . . (o. o . _ ___. c o 1 2.. ...

1 .

)

~1. \ ( kb_ BOO A h 2- , . d 2.___ . . _ .

1 '

. . _ _ . .3_

\._-_ -u 2. .. - _ . - , . - . - - . _ 33 ._L_23 _ __ _13  :

RI L

I

.. _. 2a . - . . _ . . .._ Go .L-.40 0 i -

-__ 56..L D N - _O '

wt -. _ _ . - _ . .. - __.

i ztr . lad - . - 3_ ._ . - - . 5 f8 . ._ .

__..us

=. .. .. -

J d!rm 59 . 59 O

r x. ~s

--__ 1 i_ ._ .249. . -. _ . . . . . . - _ . - fo 1 - _4 7 ' LL 2 2m _ _ _ _ _._ _ _

.__- 5% -

6/o -

d

.= 22 t ._ _ __ __ . _._ 2_ho i so o ' -

2.22_ __ _:_ . . . . ..;_ _ _ .(,. i i ce t '

i  ! >

z 2 zs  :

___& 4 t,4 '

4 i i f

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._ 7 t f ._ __ __ _

55 ! 55 i 1 o 9 i

%% _. _ ._ _ _._ __ .____ . 53.  ! 58l C_O O I , Go71

__ 2. 2]_ 5( .

5\ O  ! =~~~~

2 2 g_ _ .._ _ _ _ . _ . _.___ _ _ ___.___ ~1 L I ~1 1 Il 19

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2.5 2._. _ _ ._ . _ ____ _

___ .__ Sy sr i _.

o i  ! -

?33 _ _ _ - ___ L_. . ._.

45~_ A' T o  ;

2 3'f .

_ 1_ _N9 92 O - --

. ._ _ _ ._ ,._ 2 3 5' . / ._ . . _ y 4 4*5 0_5 i 5~ _ . _ .

S

! _ _ _ . _23 %. F#G h. . H. .p 6 */ _ i__. _ . #_.. _ L .x_.

7 5.___.. . _ . . _ . _ _ . .

. l

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. . . p _ . _ - , . e_- e - - - . . - - * . - -

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3 C Note: All of the louce level is a restricted area

)

i t

up _ . .

(___ , ,

l -

l Filters l '

, g I l 1 . .

I 3

l L]: ['

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l. .

' Fiaw

] , . .

R-3 DEM0LITION PAGE B Swipe Log

~ '

Swipe Gross Bkgd. Eff.

No. Location Counts GCPM a or B NCPM a or 8 DPM

~~

l . _ . . B_ l ....

(, S- ' N. .._5 C ' _ _ .Gs . 54k Il

. 'l . _. . .

• L 59 59 . .._ a O_ .

~'

3 _ __? . __ _ . ._ . 7 2. . 72. ... _ (3_ . _ . 2.3

. . & ._ _ ._ . _4__ _. . . . _ a . 5L. . 54 ._ _. '

Q__ _. .

~

_ . 5 ,_- __. A . . _ .. . 59 E'i 4.__  ! o__ . . .

5( S(

G '-

o.. -

. 7 .._____7 . _ _ __ . . . _ . .F0 . .EP O ____ .

9_. _

S. .._.. _ ...%. 6( di . _ . . _ - LC_ . _

\ il

. . 4. ..___.B.__ 3 . . . K4 S C. . . . _ . . . _ o____ _.. ._-

. .. .\ 0 - - ._ - '2- . - . . - . 5 L* . S G . -_ C. ... .-

_ . l(_ . 3 ._ _. _ _ __ 9 1 . M L . i O .

. . . . _ \1... . : 'L ..

to f . 6\ 'L- - _ . ._.-. N. -

_ . . 9_ . F. _ _ ___ ._ . ..__ _. _ 5 9 -.5EL..i O ._.

_ . .. VI G.. - . . _ . A5 . - _M 5 ' O ._ . _ . - -

~~

_ . _. . . . . .t F ~L __ _ _ . _ _ . '* 4 . - .. _W .. . i ~7 ____ ._... _ I 7 .

' o tG -

9 .__ ___ _ _ _ _4 9 . . 33 I _ . . .--

st _

C. t c. 4 . c.L i ~7 . _. ._ I ~2.

_ . _ . . 1 S ._ .

_. 2 . .__ .. M . . (a L._-  ! Lo /%

_. .. at 3 .___ .. _ _ W __fe.t 9 __

l4

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__ . _ . _2A = 4. _ a.9 . . . . ',_ o . I

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_ _. . .. l'1  :

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o ..

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2.54  ! 4 '

. 6 o __.__rao M i

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_. .. !_ 2.5..  ! O I - . _ . _ 6l t. I. '2., . _. _ y

_  :. 14 L-______1 2

.. . So 50 _ a _ Q_ _.;_ _ . .-

_. . '2.1 .. ._ . _ . 52 . .s 2 . . . . _ . . __1___ c. _ _ _ -

.. 2s . .

• 4 59 53 . ..

O.... -

2A 5 ST 51 ._ .

O ~

. So f- . . 5T S7 . _..__C._... . . .

3t 7 . 57 M .O......... ~

. 32. . . . . . _ _ . B . 58 S~8 .d , _ . _ _ C _.. ~

_ . 3'3 . .. X . I. __ SO . 5W O 2-o ._.5453 ~

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. w % a .. a 72

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• FiMet 1;

-! R-3 DEMOLITION PAGE 9 Swipe Log l l i:

. Swipe . Gross .

Bkgd. Eff. ,

No. Location Counts GCPM a or s NCPM a or 8 DPM l l _ . . . . . 3 H__' E- .. 1. . . S 'T. _._ 57 59 0 56,53 -

. _ _ a s _ .. . _ .. ._ 3.. . -

.._ u _e n . . o, -

3 G- .. .

4 . . *t T . _ _ HT _ O .

s

_ _ . _ . 3 7_ _ .  : .St. gr, ___

o -

l _ . ._ _ _ 3 3 ._ . . . 6.. l 42 i'2. __ _ _ O . _ _ _ _

_._ . ._ 39 _ _ _ _ . 'T __. _ ._i_ 5'i 5 4.. ._ o .

. No .9 . G, o 4 o. I 2

.50 .

, .._..Al . T I . _ .

5"O . o _ . _ _

l _ . 4L '1 fa.\ t*\ . 'L . _. '{._ _

i _ _ _ . _ N3. ._

3 . .. . _ . . _ _ . . 10 _ . 7 0. . \l .._ \ ']

__d4 _ . . ^

.. . _ .. L .. __(e *f __. 4_M _ . .

.F ..__.$.

SF &_ _ . _ . t _ . _ _ '

? 3 Lb _ _. . 1'l . 25

'SG_; _._12 ._ ...  ! (* 4 fe_ 9 __ _ . S- ._ __ ._9 M "I ._..A.__.._  ! 74 7.'4__ _ . t5 . _ . . AL

.d.s ._..._i__-

60- fe.A .__ . 7 __ n 41__ . . 5_ . . _ _  !  % Sl_ _.. O - .. _ . . .

~

so i -

6 ' (a i ( L .. . .. 1 . 4

. __ 5 i ._._ . _. 7. _ _._ l G' 3 M _. 4 . . ._ 7

._S1 .__.__%_.._ _ .L _5V Sk. . . c . _ . .

53 EL . ._ s _

51 _ st , o . _

_ . _____ 5 9 2. Ce_o .49 . . ) ._ '2

. 55 .

3 i to t 6I .. 2.. M Sb  ! 4 3 F5' 57 . o .. . __

ST . _1. ._

78 1% . .I9 . .__

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g _ __

fa O .i .. _S .

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. G3 A 9 47 47 o -

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_.. . .. & G . C 9 4.$ . . . M *f . O . -- ._ _

(* .

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.. b ,_ .. S' _ _ __

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. . . gy H 9 .

e c.._. .. 's, (. _ 7 l '2 ..

. 7o . I 9 9 5' . 45 . o -

' _ '71 .A 1 Fum., s.tume4a lb.n 59 . S1 0 -

. . 72 .* 2. ( Ri to LM . H 71 12. "2.o

~73 & 3, (. . 7 3" 7 S' tG 17 74/ 4 5i ST o -

75 s Go 60 59 I ds"B . "A 5999.

-_ . j . .

4 * . . .

i.

• Ft w R-3 DEM0LITION PAGE to

. . 4.. __ _ .

Swipe Log No. -

Location Counts GCPM a or 8 NCPM a or 8 DPM

..._. t . 2 'r i hCb_.ategew b.

7 __

K7-

• I E7

f. I .

S'l O.

1. _ . . .

.M . 3

_ . .73___L_Ied5U. _ _ .% _ . 54 54 .

O . .

79 i A% 0 . SM . K4 .. _ _ . . . O _- . .....-.~._

_. L__ R O !' to . M7 47 . ._._..o.__..- _ ._ __ _._7 _

i

.2 i :51 _.

( 2. f= 3 .. ___4..__ i. ~7 M_ _ : 11.__ . di fe '4 ._.E . _ _.. 9 __

__. &L.: n . _._ . 'TI ll . .

11 . . _ 2 e _.

.t9 _ , ' H_ . 47 47 _ ._ _ O. . . . _

. ___...._. M IE_____ __ 4 7 47 . _. 0 . . . _ _ _

%  ! W.__ __ . ._._5 7 .S7 ._ _ .... c _ _ _ ,

_ . . r L__.% 7 l 17 . . 3 9. 49 . . _ _ . 0 -- ..__

~

R& I h  % 7. . le 7 . _ . . . . ____S . _. ..._

%3 c S'l 14 __ l e S . I o S ___. _.  ! Mi . 9.2.

4o .

2.o . J. I to 2. -. _._ . 4 5

_ L_R\ l "II ._ ,...A 1 Gt. . _ i 9 L5_

I 41 72 __ T $

5% _ __ __

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i '14 I 24s . . . 7 *1 1 . ____ 11. . _ _ . .

_2 o .

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o _ ____.

96 20 L._ 5 2. . E o _._

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l 44 i  ;

si  ! must t

3

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_ ._ ._ j _ ._  ;

_ _ - _ _ . u _ _ . . . . _ _ _ _ _ . _ _ . _ . . _____ ____

- - .. + - . _ _ _ . -

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_ . _ _ . . . _ . . . . ____._.r._ . .

_ . .. . - . . . _ . . . - s .

e ...- . . .

. . 4 . .

e 9

- . _ ..._ . _ i  ! . _

7

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'I R-3 DEM0LITION PAGI $ M //

j . .

Swipe Log

~

i Swipe .. Gross Bkgd. Eff.

No. Location Counts GCPM a or s NCPM a or a DPM

(

h-:~&asr-.tdi~&f S1 5 2- 55 0 ..&H2': *6 .

~

y.loadwy&#ero. ^

?~i- :h gi ,sdt- 59

=3{ 59 66 '.~~ Al:[ ~~~I. .}~: 4V~. .::

55

~

3 Fest 49t~ 40 60  : 6 . .

8 ;..:

. bekwo .. . .. - . _ _

_ . . . . . A .h c - .. - - . _._-- ..

l 62.- _

T.1. ; ~lfi.114 Si$ Q: 59 ,59 6 5 l A ~ ~1 L L'

?:? h<"vf%WN"" #0 l'?f*

?D _

A t- D * .

f- -

D..

l .

5 A norpi....  !-

1 I  :

~ ~ ' '

' I

$, - _Y} __ _

55 g 5,,y 7 67 3 llo. . w . g ,g s g ,. 2-l - -

bb

. . $Y! - b Y . .0 _ . hY b$ $ - .b - .

o

~l%

~uf;~B 'd g haday V4 .

c(& 45 t ; - -- ^

^

. t3. :cenks -4 sos /-sd 51: -5 , 56~ 1- .  ; :S ef roadm7 ssex SM $2 % O

/ t/' . Ccnkr ed u<

1

, be- Loet thy

, l =

t ,

l

! j

t. . .

s

/

l DRAWING NO. 7 l The general radiation' survey of the R-3 Bay and the base under the R-3 reactor biological shield is shown in Drawing No. 7. These dose rate readings were taken at'one meter from the reference plane. Outside of the small octagon (reactor base) the reference plane was the Bay floor; while inside the reactor base,'the plane was 6 inches lower. See Section A-A, Drawing No. 8, point B.

The larger rectangle (Drawing No. 7) within the reactor base repre-sents the area from which concrete under the reactor core-thermal column was removed to comply with the demolition criteria. See Drawing No. 8 and Section A-A.

The dose rate readings, Drawing No. 7, meet the demolition criteria of

.5 pR/hr above background (20 pR/hr) at one meter from the surface at all points outside of the large rectangle. -Dose rates within the large rectangle are shown in Drawing No. 8.

DRAWING NO. 8 The dose rate readings shown on Drawing No. 8 were a one meter distance from the respective surfaces; not the reference planes of Drawing No. 7. The area under the R-3 core is described by the dose rates of 28, 28, and 27 pR/

hr.

An iron plate, 58" x 51" x 1", was placed over this apparent " hot" spot area and the dose rate remeasured. The iron reduced the dose rate to 21-22 pR/hr, approximately background elsewhere in the R-3 Bay. The identified isotope in concrete is Eu-152. The sum of energies from Eu-152 is approxi-mately 6.1 Mev. At this energy, the HVL of Fe is 1.14" and that of concrete is 4.35". Hence, 3.82 inches of concrete would be the equivalent of the one inch of iron used above. Theoretically, more concrete would reduce the dose rate further. However, a practical limit is reached, namely, background.

Upon termination of our R-63 license, the area occupied by the R-3 reactor will be covered by concrete to the level of the Bay floor. Thus, 18 inches of concrete will cover the apparent " hot" spot. This amount of concrete is the equivalent of 4.71 inches of iron. The dose rate at one meter above the Bay floor reference plane, with 18 inches of concrete in place, will yield a dose rate equal to the general background in the Bay, namely, 20 pR/hr. After finishing the Bay floor as indicated, an individual standing over the apparent

" hot" spot for one year would not receive a greater dose than he would in a

• , ~

8 like time elsewhere in ihe R-3 Bay.-

Several' points-ddjacent to Bay side A appear to excee'd the criteria.

-- Our Gamma Facility,.containing~Co-60 (approximately-10,000 Ci) 'and Cs-137 (approximately 75,000 C1), under a minimum of eight (8) feet'of water, re-mains in.the. bay. These points reflect the' impact of these. isotopes ~. .

i L

t-L. m

o Radiation Survey of R-3 Bay After

~Demotiotion of Shield Ludlum Micro R Meter, Model 19.

' All measurementscwith meter on meter-stick in contact with surface.

Reactor base represented by octagon in the center.

All readings in pR/hr.

Gamma Facility near-Bay Face A.

Surveyors: R. D. Cross /T. L. Brackin f

u gg '7 Al 19 IS 18 18 D h ,e

'1 f g

'u /8 1

9 il , g, 0 g ,g IB I4 ' 1 1 r1 l g 1 i t rg -1 i o ri.

A L s'o p # 4.

F\; .\% st S e ,, 1 20 s ,o n .

ir gh . Ii i o ,, . s , g, C \" 0 sc  ? no in G p , si h

c '# 'A gq y s2- gi

i. :

jq e

. p. 6 # A yc f.( 11

• e N-

-8 gs c .

,e ,r a e A

Drawing /Vo. 7

. .o.

.?- i

-o

' Radiation Surysy Under R-3-Core-

+

Therm.11 Column' Area Dose-rates taken at one meter from

indicated' surfaces.

Meter: Ludlum Micro-R Meter 1

Te seac /or- &eA 5* $W 2 V

.28 i

-.28

^

,17 -

V ,,2 7 y A. A

,2 4 -

23'

• 20 e

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8 33 F/ce r-

' l?iference

, c.

~ Soclien 'A'A k

B. .

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i Onwijg JVs. 8 A

y W g4 ,n= * - p e ,~e-t '

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