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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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Upper Cell AtmosDhere Initial Conditions and Sources. The user must specify the initial conditions<br />

<strong>for</strong> the atmosphere in each cell. These initial conditions can be different from one cell to the next.<br />

Given the cell atmosphere mole fractions, pressure, temperature, and volume, the code calculates the<br />

mass <strong>of</strong> each gas present. Alternatively, the user may specify the constituent masses and<br />

temperature.<br />

External sources <strong>of</strong> mass and energy can be provided to a cell atmosphere. Such sources can be<br />

useful <strong>for</strong> representing phenomena such as the blowdown <strong>of</strong> coolant from the reactor coolant system<br />

into the containment. External mass and energy source rates are specified as a function <strong>of</strong> time<br />

through tables.<br />

Atmosphere sources may consist <strong>of</strong> three types <strong>of</strong> materials: gases, coolant, dispersed debris<br />

particles (in DCH calculations). Other dispersed solids or liquids are no longer allowed except as<br />

aerosols or fission products. Materials <strong>of</strong> all three types contribute enthalpy to the atmosphere, but<br />

the ways in which their masses affect atmosphere physics are different. Gases, coolant, and debris<br />

particles are considered in both the intercell flow calculation and the atmosphere thermodynamics.<br />

In the atmosphere, the coolant is treated as a two-phase material. There<strong>for</strong>e, sources <strong>of</strong> coolant may<br />

be either H20V or H20L.<br />

The user is cautioned not to use atmosphere source tables <strong>for</strong> aerosol materials. Aerosol sources<br />

should be specified in the cell-level aerosol AEROSOL input discussed in Section 14.3.1.8.<br />

The input needed to activate and control models that operate at the cell level in <strong>CONTAIN</strong> is<br />

addressed in the following sections. The structure <strong>of</strong> the cell input <strong>for</strong> one cell is illustrated in Figure<br />

14-3. The entire cell level input set is repeated “ncells” times, one set <strong>for</strong> each cell defined <strong>for</strong> the<br />

problem.<br />

The present section discusses the CELL keyword and the cell level CONTROL block, which are<br />

given first and second, respectively, in the cell level input <strong>for</strong> each cell. In addition, the optional<br />

TITLE option <strong>for</strong> the cell is discussed.<br />

***** ***** ***** ***** ***** ************************************************<br />

CELL ncell<br />

***** ***** ***** ***** ***** ************************************************<br />

CELL the number <strong>of</strong> the cell to which the following input data blocks apply.<br />

= ncell<br />

The cell number is followed by the CONTROL keyword and the cell CONTROL in<strong>for</strong>mation block.<br />

The cell CONTROL block is used to allocate storage space based on the models invoked in the cell.<br />

The storage allocation parameters should be set to reflect the models that will be used at any time<br />

in the calculation, not just what might be used at the initiation <strong>of</strong> the problem. For example, if a<br />

lower cell is specified <strong>for</strong> the cell, and it does not initially have a pool layer, but it is anticipated that<br />

Rev O 14 63 6/30/97

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