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JAEA-Data/Code 2007-004 - Welcome to Research Group for ...

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2.5 ANISN ; One-dimensional S N Transport Calculation<br />

The input of this section is required when the one-dimensional S N routine ANISN is used by the<br />

specification IC2=2 or IC12=2/-2 (Sect.2.2) <strong>for</strong> either cell calculation or core calculation.<br />

In the SRAC, the original ANISN 4) is split in<strong>to</strong> two steps. In the first step the reading the input<br />

and their check and s<strong>to</strong>rage in<strong>to</strong> the arrays are executed. In the second step, the iterative procedure <strong>to</strong><br />

obtain spectrum is executed. If IC2=2 is specified, the calculation is divided in<strong>to</strong> the fast energy range<br />

and the thermal energy range with the fixed source fed by the SRAC. When IC12=2 is specified, the<br />

whole energy calculation with or without the external fixed source is executed. However, note that the<br />

external source is read in the second step. There<strong>for</strong>e input data <strong>for</strong> the external source has <strong>to</strong> be given<br />

at the last of all input <strong>for</strong> a case.<br />

Some functions permitted in the original ANISN are suppressed in the SRAC. As the<br />

macroscopic cross-sections are provided by the SRAC be<strong>for</strong>e executing the second step, the control<br />

integers relating <strong>to</strong> the cross-sections are internally set. As there is no essential change from the<br />

original ANISN, see the references 4) of the ANISN <strong>for</strong> details.<br />

The input <strong>for</strong>mat of the original ANISN (FIDO-<strong>for</strong>mat) is replaced by the the free <strong>for</strong>mat of<br />

SRAC described in Sect.2.1, however, the original key-codes specifying the array names and their<br />

orders are still kept <strong>to</strong> facilitate the reference <strong>to</strong> the original manual. The way of reading the arrays by<br />

indicating the array code of three characters is not changed except the replacement of ‘$’ code by ‘&’<br />

code in the SRAC-ANISN.<br />

< Example of input ><br />

15& & : input block <strong>for</strong> integer data<br />

1 0 4 2............<br />

16*<br />

1.0 0.1 0.0001 1.420892...<br />

* : input block <strong>for</strong> floating point data<br />

.....................<br />

00T<br />

04*<br />

indica<strong>to</strong>r <strong>for</strong> end of control data<br />

.....................<br />

27&<br />

.....................<br />

00T<br />

indica<strong>to</strong>r <strong>for</strong> end of ANISN input<br />

Block-15& Integer parameters /36/<br />

1 ID Problem ID number<br />

Enter any number (not effective).<br />

65

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