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Code Manual for CONTAIN 2.0 - Federation of American Scientists

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gives a time constant <strong>for</strong> the opening <strong>of</strong> the vent to the value given by VAREA. This method <strong>of</strong><br />

specif@g the vent characteristics obviously could conflict with the vent characteristics given by the<br />

tables, and thus the combination is not allowed. Similarly, only one table maybe specified <strong>for</strong> a<br />

given vent, since each represents an independent modeling option. A table may be used in<br />

conjunction with any <strong>of</strong> the keywords which change the vent state, such as VTOPEN, VTCLOS, and<br />

VDPF. VAREA may also be used with any table that does not represent the area, but it is used in<br />

that case only to define the aerosol settling rate through the vent. Note that the table values are<br />

accessed only when the vent is open. When the vent is closed, the flow and the flow area (if<br />

specified) are zeroed out.<br />

14.2.4.3 Sw.mressionPool Vent Flow Path. The suppression pool vent flow path model <strong>for</strong> a boiling<br />

water reactor is activated through the SPVENT keyword. Only one SPVENT block is allowed, and<br />

only two cells may be connected by the suppression pool vents.<br />

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

SPVENT<br />

NDRY=ndry NWET=nwet<br />

[NSVNTS=nsvnts] [AVNT=avnt] [VNTLEN=vntlen] [ELEVNT=elevnt]<br />

[DPDRY=dpdry] [DPWET=dpwet] [FDW=fdw] [FWD=fwd] [GINLEN=ginlen]<br />

[{SCRUB<br />

[BSIZI=bsizi] [VROVR=vrovr]<br />

EOI or<br />

SPARC<br />

[BSIZI=bsizi] [RATIO=ratio] [NRISE=nrise]<br />

EOI}]<br />

EOI<br />

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

The following keywords specify geometrical and physical parameters <strong>of</strong> the suppression pool vent<br />

flow path system. Note that in addition to the input described here, a lower cell pool must be defined<br />

in the wetwell cell (see Section 14.3.2.5). The lower cell area must be set to the sum <strong>of</strong> the wetwell<br />

area and vent area. The pool height relative to this area maybe different from the height relative to<br />

the cell cross-sections specified in the cell GEOMETRY block. Figure 11-4 illustrates the<br />

significance <strong>of</strong> the geometric parameters.<br />

The following keywords are required:<br />

SPVENT the keyword <strong>for</strong> beginning the specification <strong>of</strong> the suppression pool vent path.<br />

NDRY the number <strong>of</strong> the cell on the drywell side <strong>of</strong> the suppression pool vents.<br />

= ndry<br />

Rev O 14-31 6/30/97

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