silo 3 - U.S. Department of Energy

C. Mechanical Retrieval Svstem
E N G I N E E I? I N GQ
Project:
Calculation Number: 40430-CA-0003
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The mechanical retrieval system exhaust processes 72.8 Ibshr Q 50 Ib/cf for a 6 cyhr production rate,
through a dust collector and HEPA filter with respective efficiencies of 99.9% and 99.97%, as shown in air
stream number 12 in Reference 3. The release rate is:
R = 72.8 Ibhr x 7000 grainsnb x 0.001 x 0.0003
R = 0.153 grainshr
D. Particulate Activitv Released
During Phase 1 ,,the, release,rate. ls the sum-of the building ventilation and pneumatic
total of 0.00056 + 0.001 7 = 0.00226 grainshr.
.... . retrieval
~
system for a
The total particulate activity per gram waste released as articulates is the total activity per gram given in
Table 1 for the waste, 105,863 pCUg less the 35% of 218k@0Rn/%n that is free to emanate from the
solid fraction of the waste: 105,863 - 1,807 pCVg = 104,056 pCi/g. Therefore, the activity released per
year Q is
Q = 0.00226 grainshr x lbt7000 grains x 454 gAb x 8760hr/yr
= 1.28 glyr
= 1.28 g/yr x 104,056 pC/g
= 1.33 x IO-' ~Vyr
Radionuclide specific release rates are determined using the radionuclide specific concentrations
presented in Table 1 and the mass release rate for airborne particulates for Phase 1 (1.28 g/yr), based on
6 cyhr continuously for 1 year. Radlonuclide-specific release rates are summarized in Table 3.
During Phase 2, the release rate is the sum of the building ventilation and the. mechanical retrieval system
for a total of 0.00056 + 0.153 = 0.154 grainshr.
Q = 0.154 grains/hr x lb/7000 grains x 454 g/lb x 8760hr/yr
= 87.5-r
= 87.5 x 104,056 pciig
= 9.1 x lod Ciryr
Radionuclide specific release rates are determined using the radionuclide specific concentrations
presented in Table 1 and the mass release rate for airborne particulates for Phase 2 (87.5 g/yr), based on
6 cyhr continuously for 1 year. Radionuclide-specific release rates are summarized in Table 3.
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