Code Manual for CONTAIN 2.0 - Federation of American Scientists

atmosphere and atmosphere-to-structure, regardless of whether the atmosphere actually
participates in the radiative transfer.
5. A waste repository, which keeps track of audit energies and masses. This repository is used
as a destination for processes that have no obvious user-specified or mechanistically
determinable path or destination. The waste repository includes the contributions of the
aerosols that are comprised of thermodynamic materials in the aerosol waste locations.
However, the principal purpose of the waste repository is to track coolant that would
normally be directed to a pool but is lost from the problem because a pool is not defined.
The energy accounting for waste locations is similar to that of any other repository, except
that there is no energy outflow or thermodynamic state inforrnation, and the repository
energy is set equal to the sum of the influx and source enthalpies.
Entities that are not considered to be internal repositories in the present accounting scheme include
the following:
1. External repositories, which are discussed above in Section A.2. An example of an external
repository is the lower cell configuration representing CORCON.
2. Engineered systems, which in CONTAIN play the role of interfaces between repositones but
are not considered repositories in themselves. For example, a containment spray is
considered a model for determining the mass and enthalpy to be removed from a cell
atmosphere and directed to a recipient pool. In the mass and energy accounting, injected
spray water is treated as a two-step process involving injection into a cell atmosphere and <
transfer of effluent to a recipient pool. Since the suspended spray drops are not considered
to be a repository, it is necessary to treat the effects of the spray drops, integrated over the
drop fall, as if they occurred during the timestep in which a set of spray drops is injected.
The spray effluent which forms is also transferred to the recipient pool in the same timestep.
The liquid mass and energy contributed by an engineered systems reservoir, such as a
containment spray tank or the ice in an ice condenser, is treated as an external source in the
repository to which the liquid mass and energy are introduced.
3. The pool scrubbing models for injected gas/aerosol mixtures are treated in a manner similar
to that for engineered systems: they determine the partitioning of heat and mass between the
atmosphere and pool but the gas and associated aerosol inventory in transit within a pool at
any one time is not considered to be a repository.
Prior to defining the audit energies, it is convenient to define the specific internal energy and
enthalpy functions used for the CONTAIN thermodynamic materials with respect to the energy
accounting. The specific energy is defined as
u~(T,P~) = specific internal energy of material k (A-1)
= h~(T) - P~p~(T,P~) = u~(T) (for gases and water vapor with the ideal
equation of state)
= h~(T, p~) - p~pk(T,pk) (for water vapor with the non-ideal equation
of state)
O A4 6/30/97