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DOE-STD-3013-2000
although comparable to that from Pu, would still represent an insignificant source of
B.2.5
Aggregate Equation
Summing the three partial pressures:
P = PF + PG + PHe.
[24]
Using the terms given above:
-5
P = P0(T1/T0) + 0.67 mLT1/V1 + 7.517x10 Q0τT1/V1
[25]
where the symbols have the meanings indicated in Table B-1.
Table B-1
Meaning of Symbols in the Pressure Equation (Eq. 25)
Symbol
Quantity
Units
Symbol
Quantity
Units
P
Container Pressure
psia
V1
liters
Free Gas Volume
P0
Fill Gas Pressure at Filling psia
m
Mass of Oxide
kg
T1
Evaluation Temperature
K
Storage Time
years
τ
T0
Fill Gas Temperature at
K
Q0
Container Heat Generation watts
Filling
Rate
L
Moisture content
wt%
B.3. Application of the Equation
B.3.1 Example Calculation of Free Volume using the "BNFL" Containers
Information on the "BNFL" container design is given in Table B-2. Can weights and volumes in
that table were determined by J. Stakebake [Stakebake 1997]. Volumes were derived from
BNFL drawings and calculations. The interior volume of the inner container does not take into
account the curvature of the can bottom. The free volume is determined as the interior volume
less the material volume of interior containers. The free volumes shown for the inner and outer
containers were agreed upon by SRS and RFETS contractor personnel and used by BNFL for
design at the direction of DOE.
56


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