Code Manual for CONTAIN 2.0 - Federation of American Scientists

14.0 INPUT DESCRIPTION
The input needed to run CONTAIN and to use its vaxious options is described in this section. The
overall format for the input file is discussed fwst, followed by the specific requirements. In general,
the structure of input to CONTAIN is quite flexible. Certain restrictions on the ordering of the main
input blocks are identified below, but these are quite limited. Note that all CONTAIN quantities are
in S1units, unless otherwise specified.
Preparation of input for running a problem with CONTAIN need not be overly complicated. As a
result of the modular use of physics routines, certain problems can be formulated rather simply. For
more complex and detailed problems, the input becomes correspondingly more complicated. To
simpli~ the task, the input has been designed with several key features, including
● A general free-field, keyword-driven format. Physical models are activated only by the
presence of associated keywords in the input stream and are otherwise inactive. Note that
keywords are presented in the discussion in upper case, but depending on the system may
actually be input in lower case.
s Default values for input variables. Most models allow the user to specify individual physical
parameters. In many cases, however, default values will prove satisfactory.
● Separately specified global input and cell level input. Global input (for processes common
to more than one cell) and each of the individual cell input sections are grouped separately
to allow the user further flexibility in setting up a problem. For example, one cell may
require detailed modeling, while others may simply be gas reservoirs.
The most important principle concerning input is that if a keyword is left out, the model associated
with it is not activated, even if this means physically unrealistic results. Leaving CONDENSE out
of the input, for example, results in no condensation mass and heat transfer in the problem.
14.1 General InDut Format and Structure
CONTAIN has a large number of models and features, and as a consequence, a complete cataloging
of input options and instructions might be somewhat overwhelming at fwst sight. To maintain a
clear perspective, the input format will be shown as follows: first, an outline of the input file
structure in this section; second, summaries of the global input and detailed instructions for each
input option (Section 14.2); third, a description and instructions for the cell level input (Section
14.3); fourth, descriptions of the table input format for many of the global and cell input options
(Section 14.4); and finally, the instructions necessary to restart a CONTAIN calculation (Section
14.5).
Figure 14-1 shows an outline of the input file structure. Note that there are several sections of the
input. The global input, initiated by the word CONTROL, must be given next. This section has
blocks of information common to all cells, including standard CONTAIN material names, the names
of any user-defined materials, information on fission products and their properties, and information
that defines interactions among cells. A number of cell input sections, initiated by the keyword
Rev O 14 1 6/30/97