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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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NDHGRP<br />

= ndhgrp<br />

thenumber <strong>of</strong>debris generations ina DCHcalculation. Anew generationis<br />

created with “ndhbin” fields in it when the amount <strong>of</strong> debris added to the<br />

previous generation has exceeded the allowable mass threshold, “grplim.”<br />

This threshold is specified in the global DHEAT block. The maximum<br />

number <strong>of</strong> fields in the calculation is the product <strong>of</strong> “ndhbin” and “ndhgrp.”<br />

This product corresponds to the number <strong>of</strong> debris fields Nfi,lAdefined in<br />

Chapter 6. Default= 1.<br />

EOI the keyword required <strong>for</strong> terminating the global CONTROL block.<br />

Unless otherwise noted, there are no preset maximum values <strong>for</strong> the control variables. However, the<br />

amount <strong>of</strong> storage space needed increases rapidly as the values <strong>of</strong> control variables increase. There<br />

is a default total working storage limit specified in the code. If the set <strong>of</strong> control parameters requires<br />

more storage than allowed by that limit, a fatal input error will occur, and a message about how to<br />

update the code to allow more storage will be printed in the error file. Note that increasing the<br />

allowable storage will require that the code be recompiled.<br />

An additional global control keyword, NHM, is sometimes seen in older decks. This option is<br />

obsolete but still supported by the code (see Appendix B). Another <strong>for</strong>mat <strong>for</strong> the CONTROL block<br />

is available. This <strong>for</strong>mat is also discussed in Appendix B. This alternative <strong>for</strong>mat may appear in<br />

input files developed <strong>for</strong> earlier versions <strong>of</strong> <strong>CONTAIN</strong>. While upwardly compatible, it is considered<br />

obsolete and cannot be used to speci~ the newer control input parameters.<br />

14.2.1 Material, Fission Product, and Aerosol Names<br />

The material names block specifies the materials to be used in the problem. Four types <strong>of</strong> materials<br />

may be specified under the keywords COMPOUND, USERDEF, FP-NAMES, and AERNAMES,<br />

respectively.<br />

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

MATERIAL<br />

COMPOUND (names)<br />

[USERDEF (unames)]<br />

[FP-NAMES (fname)]<br />

[FPLIB<br />

{ALL or (nchlib)}<br />

[EOIj<br />

[G-TARGET<br />

[(gna.me=nfp (fpnarne))l<br />

EOIl<br />

[AERNAMES (aemames)]<br />

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

A library <strong>of</strong> material properties is provided in <strong>CONTAIN</strong>. A list <strong>of</strong> the materials included in this<br />

library is given in Table 3-1, Materials Available in <strong>CONTAIN</strong>. Any number <strong>of</strong> materials from this<br />

O 14 13 6/30/97

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