User's guide for THERMIT-2 : a version of THERMIT for both core-wide and subchannel analysis of light water reactors

Abstract

This report provides the THERMIT-2 user with programming and input information. THERMIT-2 is the most recent version of THERMIT. This new version contains all of the features and options of the original version of THERMIT documented in References 1 and 2. Additionally, the ability to analyze subchannels as well as improved modeling have been added to the code. These new additions are described in detail in Reference 3. The interested reader is referred to these references for further information about the physical modeling.

In this report, the programming information is given first. This information includes details concerning the code and data structure. The description of the required input variables is presented next. After the meanings of these variables are given, the sample problems are described and the THERMIT-2 results are presented.

THERMIT-2 contains subroutines from the IMSL Library, a proprietary package from International Mathematical and Statistical Libraries, Inc., Houston, Texas. These routines may not be redistributed or removed from this software for use in other software development, IMSL routines included are: LEQTIB, UERTST and UGETIO.