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Environmintil
Contractor
Contractor ERC Team
Interoffice Memorandum
TO' I). A. St John LO-19 DATE:
Sec 13clow
Corr=ration (pCi/0
2.55 pCi/g
1.2E3 pCi/g
4.95 pCi/g
7.5E-1 pCi/g
2.55E2 pCi/g
7.5F-2 pCi/g
1 5 OCUM
1.4613 pCi/g
373 °"79 F"-02
1^ebruary 27. 1999
At
nto+t: S. L. Winslow
RadCun Engineering
X34 1/531-0706
SU BJECT. C'URIF ESTIMATE FOR SJUPP1NGCONCRF.TE CORE SAMPLES
Job No. 22171
.^wY..YY.... b
D\.0 . -A
Ol e for
n v
CCN: 055088
.Su^w\Cob !I!0
The hollowing calculations Show that con: 5amplawith a direct reading of equal to or less than
400.000 dpm/l0(km' will be below the definition of radivactive material as defined in 49 CFR 173.403
of 70 Ay/g (2F.3 pCi/g). Lach sample will cunsistof concrete material itu n four - two inch co re
samples and enough water to make a slurry consL*ncy. 'Fhe distribution of radionuc lides is based on
previous concrete samples uJten front below grade Fuel Storage Basin that would also he
representative of these concrete samples.
(jiver:
Cylinder Volume = n r'h Radius of concrete core (r) = I inch
Concrete Density = 2.35 g/em `Height of com sumple taken (h) - 0.25 inches
27 pCi = Dq Maximum Jima reading on core = 400.000 dprn/IUOcaY
2.22 dprn = pCi
('alUUldlions:
V - ( 3.14) (1 in.)'(U 25in) = 0.79 in' (16.4 car/i n -')(4 cure simplcs) = 512 cm'
(400.000 dpnr/51.2 cm') (cm' 12.35 g) = 3.32E3 dpn/g
332L3 dpm/g (pCi/2. 2 dpm) = 1.5E3 pCi/g or 55.4 Bq/g
ti1.W:dld
°Co
"'Cs 82
02 E
Percent Distribution(%)
0.17
0.33
'"Eu 0.05
"'Sr
17
W ,.iun
taoawPu
0.U05
0.1
TU'fAL
('ones•
S. (i. Marske X5-53
P. A. Newman X3 -4 1
RadCun Enginee ring File/LB XO-23
Document and Into Services 110-09
6 16.4.