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Environmental
Contractor
Contractor
Visa
Team
Interoffice Memorandum
M.
'.nrna!
D. A. St. John r.0-19
See Below
°"M 1'ebruary 27.1999
rtiaa S. L. Winslow
RadCun Engineering
X3-41/531-0700
susurcr: CURIF ESTIMATE FOR S111PP1NGCON[:RETF. CORE SAMPLES
CotQatration (obi/e)
2.55 pCilg
1.2F3 pCi/g
4.95 pCi/g
7.5E-1 pCi/g
2.550 pCifg
7.5E-2 pCi/g
1.5 1
1.46L'3 pCi/g
CCN: 055088
Job No. 22192
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The 1i111uwing calculations show that core sample: with a direct reading of equal to or Icss than
400.000 dpm/1Merin' will be below the definitionorrulivactive material as defined in 49 CFR 173.403
of 70 Bq/g (2F.3 pCi/g). Each sample will consist of contxete material from four, two inch core
samples and enough water to arike a slurry consismacy. 'the distribution of radionuclides is hued on
previous concrete samples rakcn from the below gtadie Fuel Storage Basin that would also he
representative of these concrcec samples.
(jiven:
Cyiinder Volumc = itA Radius of concrete core (r) = I inch
Concrete Density = 2.35 g/em' Height of cam sample taken (h) - 0.25 inches
27 pCi = Dq Maximum 5rn:1 reading on core = 400,000 dpna/ I OOcm'
2.'_2 dpm = pCi
Calculations:
V — (3.14) (1 in.)'(0 25in) = 0.78 in' (16.4 ciOin-' (4 con: samples) = 51.2 cm'
(400,000 dpm/51.2 cm) (cm'/2.35 g) = 3.32E3 dpVg
3.321:3 dpm/g (pCi/2.2 dpm) = 1.5E3 pCi/g or 55.4 Bq/g
SI.W:dld
°Co
Percent Distribution(`7)
0.17
"'cs
432
EU
82
0.33
1"Eu 0.05
90Sr 17
7Ai Ain 0.005
239'rx'Pu
0.1
TU rAr-:
('epics:
S. 0. Marske X5-53
P. A. Newman X3141
RadCun Engineering file/LB XO-23
Document and Into Services 010-09
'0
0085