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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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12.5.4 Pipes<br />

The keyword PIPE with the input parameters described in Section 14.3.3.9 invokes the pipe model.<br />

The pipe component is used like the valve model (see Equation (12-33)), except that the flow<br />

resistance is characteristic <strong>of</strong> pipe flow rather than valve flow. [FI079] The geometry <strong>of</strong> the pipe is<br />

described by input parameters defining the pipe length “pipel,” the inside diameter “pipeid,” and a<br />

total irreversible loss factor “pipekf,” which should be equal to the sum <strong>of</strong> the Moody friction factor,<br />

entrance and exit loss factors, and any other <strong>for</strong>m loss factors.<br />

12.5.5 Water Storage Tanks<br />

The WST is used to supply water <strong>for</strong> the containment spray. It is connected with the containment<br />

spray system through valves and pumps to the containment spray nozzles. The WST provides an<br />

initial amount <strong>of</strong> water to supply the containment spray. When the tank inventory is exhausted, the<br />

containment spray system can acquire its water from the pool in cell “iclin” in the recirculation mode<br />

(see Figure 12-2).<br />

The user should specify the initial mass <strong>of</strong> WST water “tnkrnas,” the water temperature “tnktem,”<br />

and the constant mass flow rate “tnkflo” at which the water is delivered to the containment spray<br />

after the keyword TANK, as described in Section 14.3.3.10.<br />

12.5.6 Liquid Transport Overflow<br />

The engineered systems OVERFLOW keyword described in Section 14.3.3.11 invokes the pool ~<br />

overflow model. (This keyword should not be confused with the cell OVERFLOW keyword that<br />

defines the ovefflow cell <strong>for</strong> condensate film run<strong>of</strong>f and aerosol mesh losses.) Three required input<br />

pararneters--’’iclfrrn,“ “iclto,” and “flovht’’--indicate the overflow cell number, the destination cell<br />

number, and the height relative to the bottom <strong>of</strong> the pool at which overflow occurs, respectively.<br />

In the pool overflow model, all coolant above the overflow height “flovht” in the cell “iclfrrn” is<br />

diverted to the destination cell “iclto,” provided the transfer is in the positive direction with respect<br />

to the pressure head. Note that this pressure head criterion takes into account the gas pressures in<br />

the respective cells, as well as the pool depths. Overflow maybe included along with any allowable<br />

combination <strong>of</strong> components making up an engineered system.<br />

O 12 26 6/30/97

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