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Code Manual for CONTAIN 2.0 - Federation of American Scientists

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14.3.3 Engineered Safety Systems<br />

The cell level keyword ENGINEER is used to specify engineered safety features (ESFS) and/or<br />

engineered system components that <strong>for</strong>m the coolant redistribution system connecting lower cell<br />

pools. The three available ESFS are the fan cooler, the ice condenser, and the containment spray,<br />

activated by the keywords FANCOOL, ICECOND, and SPRAY, respectively. Only one ESF or one<br />

redistribution system component may be defined after each ENGINEER keyword, but any number<br />

<strong>of</strong> ENGINEER keywords can be specified in a cell. Each ENGINEER keyword is considered to<br />

define an “engineered system.” (The number <strong>of</strong> such systems “naensy” should be specified in the<br />

cell level CONTROL block. See Section 14.3.) For example, a given cell may include one fan<br />

cooler, two pumps, and five valves as engineered systems <strong>for</strong> that cell. Each <strong>of</strong> the pumps and each<br />

<strong>of</strong> the valves should be specified as a separate system.<br />

In the specification <strong>of</strong> an ESF, the keyword SOURCE indicates that the inlet coolant flow to either<br />

a containment spray or the cooling coils <strong>of</strong> a fan cooler is to be specified as an external source with<br />

mass flow rate and temperature given as a function <strong>of</strong> time. A tank, activated by the keyword<br />

TANK, may also provide the source <strong>for</strong> a containment spray. If the source <strong>of</strong> the spray is<br />

recirculated water from a pool, a heat exchanger model activated by the keyword HEX must be used.<br />

Water to be recirculated may come from a pool in another cell, specified by the input variable “iclin.”<br />

The residual liquids from an ESF may be diverted to the cell specified by the input variable “iclout.”<br />

The redistribution <strong>of</strong> coolant liquid from the pool <strong>of</strong> one cell to that <strong>of</strong> another may also be modeled<br />

through an engineered system component. If any one <strong>of</strong> the PIPE, ORIFICE, or VALVE<br />

components is specified, the flow rate is determined by the pressure difference between the two cells ~<br />

and the hydraulic head <strong>of</strong> the respective pools. Specification <strong>of</strong> a valve between the two cells allows<br />

opening and closing <strong>of</strong> the flow path. If PUMP is specified as the component, a constant flow rate<br />

is maintained from “iclin” to “iclout” as long as liquid is available in “iclin.” Overflow modeling<br />

activated by the keyword OVERFLOW will allow coolant to overflow from the pool <strong>of</strong> one cell to<br />

that <strong>of</strong> another.<br />

The complete input template <strong>for</strong> the ENGINEER input block is given below. Detailed descriptions<br />

<strong>of</strong> the three ESF models and the liquid redistribution components are given in the following sections.<br />

It should be noted that only one ESF model and certain logical combinations <strong>of</strong> components are<br />

allowed in any one engineered system as discussed in the following subsections.<br />

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

ENGINEER onmsys numcom iclin iclout delev<br />

[SOURCE=nso<br />

(H20L=n<br />

IFLAG=ival<br />

T=(times)<br />

MASS=(masses)<br />

{TEMP=(temps) or ENTH=(enths)}<br />

EOI)]

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