Code Manual for CONTAIN 2.0 - Federation of American Scientists

NOTE: The cell OVERFLOW option should not be con.sed with the ESF OVERFLOW component
(see Section 14.3.3.11) which models liquid transfers between lower cell pools.
14.3.2 Lower Cell
The cell level keyword LOW-CELL activates the input for the lower cell models. The lower cell
consists of a series of layers in the bottom of a cell. The following layer types are considered: a
concrete layer, multiple intermediate layers, a pool layer, and an atmosphere layer. For all but the
atmosphere layer, a set of physics modeling options can be activated through input in the
LOW-CELL block. The initial configuration of the layers and initial material masses are also
specified in this input block. The atmosphere layer is used as an interface between the lower cell and
the upper cell; therefore, it is automatically created, and its configuration cannot be specified by the
user.
Due to the complexity of the lower cell models, the lower cell input can ofien be quite extensive.
This is particularly true when the CORCON and VANESA models are specified. The lower cell
input descriptions are therefore given at two levels of detail. The f~st level of detail shows the
overall structure of the lower cell input. This level of detail is most useful for determining the order
of the major sub-blocks in the lower cell input (see Section 14.3.2.1 below). The second level of
detail gives the minor sub-blocks within each major sub-block. Complete descriptions of each
keyword in the major and minor sub-blocks are given in the detailed descriptions. These
descriptions are given in separate sections beginning with Section 14.3.2.2. The descriptions of the
CONCRETE and INTERM input blocks are further subdivided into problems without CORCON
modeling of core-concrete interactions and those with CORCON.
14.3.2.1 Overall Lower Cell IxmutStructure. There are two general classes of problems that can be
modeled with the lower cell capabilities. The f~st such class consists of problems in which there
are no explicitly modeled core-concrete interactions and the CORCON model is not active. Lower
cell modeling is confined to heat transfer effects in such problems. The second class consists of
problems in which core-concrete interactions are modeled with CORCON. Ih these cases the
VANESA model may also be activated. The overall lower cell input structure given below applies
to both general classes of lower cell modeling.
Only the major lower cell sub-blocks are shown in this section. These major sub-blocks include the
sub-blocks that define the three possible types of layers (concrete, intermediate, and pool) in the
lower cell. Layers in the lower cell are defined from the bottom to the top of the cavity, with the
bottom layer given fnst in the input, the next layer up given second, and so forth. Jn the following,
the order of layers from bottom to top is assumed to be the concrete layer, if present, then the
intermediate layer(s), if present, and then the pool. This order applies to both general classes of
problems.
***** ***** ***** ***** ***** ************************************************
LOW-CELL
GEOMETRY=carea
BC=txl
[CRANK=crank]
[DECAY-HT
Rev O 14 115 6/30/97