Geometry Consideration - std301320040061

DOE-STD-3013-2004

where PF, PG, and PHe are the partial pressures of the fill gas, the evolved gases and decay

helium, respectively.

B.2.

Derivation

B.2.1

Geometry Consideration

The volume occupied by the gas at the evaluation temperature, V1, will be called the "free gas

volume" of the package.

This volume can be

Headspace

calculated as the

unoccupied volume (Vc)

of the outer can (i.e.,

interior volume of the

Void spaces occupied by gas

outer can less the

Convenience Container

volume occupied by the

Outer Container

materials comprising

Inner Container

internal containers), less

Annular Spaces

the volume occupied by

Figure B-1. Illustration of the components of free gas volume.

the contained material.

These volumes, which are illustrated in Figure B-1, can be represented as

V1 = Vc - Vm

[5]

and

Vc = Vo - vi - vcc

[5a]

where Vo is the interior volume of the outer container,

vi is the volume of the material of the inner container,

vcc is the volume of the materials making up the convenience container, and

Vm is the volume of the contained material.

B.2.2

Container Fill Gas

The appropriate equation for pressure as a function of temperature is simply the gas law:

PF = P0(V0/V1)(T1/T0).

[6]