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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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5.8.15 Energy Conservation (2.3.12 from Bra93)<br />

The description in Section 2.3.12 <strong>of</strong> Reference Bra93 is directly applicable to the <strong>CONTAIN</strong><br />

implementation <strong>of</strong> CORCON.<br />

5.8.16 Cavity Shape Change (2.3.13 from Bra93)<br />

The description in Section 2.3.13 <strong>of</strong> Reference Bra93 is directly applicable to the <strong>CONTAIN</strong><br />

implementation <strong>of</strong> CORCON.<br />

5.8.17 Aerosol Generation and Radionuclide Release (2.3.14 from Bra93)<br />

The description in Section 2.3.14 <strong>of</strong> Reference Bra93 is directly applicable to the <strong>CONTAIN</strong><br />

implementation <strong>of</strong> CORCON, with the exception that the simple model <strong>for</strong> aerosol generation in<br />

CORCON Mod3 that was retained from CORCON Mod2 is not available in the <strong>CONTAIN</strong><br />

implementation. If aerosol generation modeling is desired, the VANESA modeling must be invoked.<br />

For the interested reader, the simple model available in the stand-alone implementation <strong>of</strong> CORCON<br />

Mod3 is described near the bottom <strong>of</strong> Section 2.3.1 in Reference Bra93.<br />

5.8.18 Aerosol Removal By Overlying Water Pools (2.3.15 from Bra93)<br />

The description in Section 2.3.15 <strong>of</strong> Reference Bra93 is directly applicable to the <strong>CONTAIN</strong><br />

implementation <strong>of</strong> CORCON. Coolant pool behavior is also discussed in Section 5.4.<br />

5.8.19 Material Properties (2.4 from Bra93)<br />

The description in Sections 2.4.1 through 2.4.3 <strong>of</strong> Reference Bra93 is directly applicable to the<br />

<strong>CONTAIN</strong> implementation <strong>of</strong> CORCON. The equations governing the coolant pool in Section 2.4.4<br />

are not applicable, since the coolant pool thermal hydraulic behavior is modeled on the <strong>CONTAIN</strong><br />

side <strong>of</strong> the interface. The coolant pool equations in <strong>CONTAIN</strong> are given in Chapter 4 <strong>of</strong> the<br />

<strong>CONTAIN</strong> code manual.<br />

5.9 Numerical Considerations and Known Limitations<br />

5.9.1 Layer Processing<br />

A simplified overview <strong>of</strong> the processing that occurs each timestep in the <strong>CONTAIN</strong> lower cell<br />

modules is given here. First, any radiant energy exchange between the uppermost layer and the<br />

atmosphere is taken into account. The actual radiant heat flux is computed by the upper cell<br />

radiation controller. External mass and energy sources are then added to the appropriate layers and<br />

new equilibrium conditions are found. These external sources can include sources from mechanistic<br />

upper cell models (e.g., sprays) and user-defined material source tables. The atmosphere-pool<br />

condensation model is then processed if the CONDENSE option is used (see Section 10.2.1) and a<br />

pool is present. If CORCON is not active, the interlayer heat transfer coefficients are then<br />

determined and the conduction model is called. Volumetric heating <strong>of</strong> the layers (e.g., by explicitly<br />

specified fission products, through the DECAY-~ option, and through user-specified Q-VOL _<br />

O 532 6130197

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