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Code Manual for CONTAIN 2.0 - Federation of American Scientists

Code Manual for CONTAIN 2.0 - Federation of American Scientists

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fpliq the transport efllciency factor <strong>for</strong> “fpname” in liquid pathways. This should<br />

be a real value between zero and one. It specifies the ratio <strong>of</strong> the relative<br />

amount <strong>of</strong> the fission product transferred to the relative amount <strong>of</strong> water<br />

transferred when condensate drains from structure surfaces to a recipient pool<br />

and when direct pool-to-pool coolant transfers occur through engineered<br />

systems components, such as a pipe. In the first case, the fission product is<br />

transferred from the structure surface to the destination pool. That pool can<br />

be designated through the cell OVERFLOW keyword discussed in Section<br />

14.3.1.12. (This keyword should not be confused with the engineered<br />

systems OVERFLOW component discussed in Section 14.3.3.11.) In the<br />

second case, the fission product is transferred from one pool to another.<br />

Default = O.<br />

EOI the keyword required <strong>for</strong> terminating the FPLIQUID input block.<br />

14.2.7 Global DCH Input Block<br />

The DHEAT block at the global level is used to specify parameters <strong>for</strong> a <strong>CONTAIN</strong> calculation with<br />

DCH. The DHEAT block is required, in addition to the NDHBIN, NDHSPC, and possibly the<br />

NDHGRP global control parameters, to per<strong>for</strong>m such a calculation. The latter parameters control<br />

the dimensionality <strong>of</strong> the airborne debris fields, or bins. In addition to the airborne fields, a trapped<br />

or nonairbome debris bin is allocated <strong>for</strong> each cell. Trapped debris may also be directed to an<br />

intermediate lower cell layer, if that exists in a cell. Additional DCH-CELL blocks at the cell level<br />

are also used to specify parameters that pertain to a particular cell. The user should note that some<br />

<strong>of</strong> the keywords in the DHEAT and DCH-CELL block are the same. The specification <strong>of</strong> such a<br />

keyword (and corresponding value, if any) in the DHEAT block sets the option or value to be used<br />

in each cell, unless overridden by the specification <strong>of</strong> the same keyword through the DCH-CELL<br />

input <strong>for</strong> a given cell. Cell-level DCH-CELL input blocks are also used to set trapping model<br />

options and to provide tabuku (i.e., value versus time) input <strong>for</strong> a number <strong>of</strong> parameters. It should<br />

be noted that the tabular input <strong>for</strong> such a parameter will always override any single value specified<br />

after the corresponding keyword <strong>for</strong> the parameter. It should also be noted that the keywords ON<br />

and OFF appearing in the template below are optional, and are provided primarily <strong>for</strong> use on a<br />

restart.<br />

The materials introduced into the debris fields must be user-defined materials <strong>of</strong> type DEBRIS. The<br />

requirements <strong>for</strong> the DCH material set are discussed in more detail in Section 14.2.1.2.<br />

When the reactor pressure vessel (lWV) and cavity models are invoked, the user should remember<br />

that both an RPV and a cavity cell must be designated, and that these two <strong>CONTAIN</strong> cells must be<br />

connected by a single gas flow path. The characteristics <strong>of</strong> this flow path maybe specified as usual<br />

in the <strong>CONTAIN</strong> input, but the user should be aware that the presence <strong>of</strong> debris in the RPV cell<br />

within the time interval defined by “strtim” and “stptim” will activate the RPV and cavity models<br />

in <strong>CONTAIN</strong>. During this time, the RPV and cavity models take control <strong>of</strong> the flow path between<br />

the RPV and cavity cells according to the input that has been provided in the RPVCAV input<br />

section.<br />

Rev O 14-43 6/30/97

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