Comparative analysis of constitutive relations in TRAC-PF1 and RELAP5/MOD1

Technical Report · Sat Jun 01 04:00:00 EDT 1985

OSTI ID:6332609

Rohatgi, U S; Jo, J H; Slovik, G C

The purpose of this document is to describe the basic thermal hydraulic models and correlations that were used in the TRAC-PF1 (Version 7.0) and RELAP5/MOD1/CYCLE=14 codes. Concerted efforts have also been made to assess the models described in the code manuals and to compare them with their FORTRAN versions in the code. Some discrepancies between the documentation and the code, some errors in the models, and variety of constraints on the models were found and have been reported here. Furthermore, comments based on BNL experience with TRAC-PF1 and RELAP5/MOD1 assessment have been made wherever seemed necessary. The text contains many FORTRAN variables in order to help the readers who might be interested in modifying these codes. A table comparing the constitutive relationships in these two codes have also been presented. The report has been arranged in eight technical sections for each code describing the flow regime maps and the correlations for interfacial area density, interfacial mass and energy transfer, interfacial momentum transfer, wall heat transfer, wall friction, form losses and choking. In the last two chapters, a summary of the discrepancies between the codes and their manuals, comments on the models and a list of recommendations for each code have been presented.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6332609
• Report Number(s): NUREG/CR-4292; BNL-NUREG-51898; ON: TI86001821
• Country of Publication: United States
• Language: English

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