1. NAME AND TITLE
THACT-RR: Analysis of Thermal Hydraulics Transients in Research Reactor Core.
de Radioprotection et Surete (C.R.S.), B.P. 1017 Alger Gare, Alger 16000,
Centre de developpement des Systemes Energetiques (C.D.S.E.), B.P. 180
Ain-Oussara, 17200, Djelfa, Algeria through the OECD Nuclear Energy Agency Data
Bank, Issy-les-Moulineaux, France.
3. CODING LANGUAGE AND COMPUTER
Fortran 77; DEC VAX Series (P00587D0VAX00).
4. NATURE OF PROBLEM SOLVED
A Computer Program for Analyzing Thermal-Hydraulics transients in Research Reactors. THACT-RR is a channel code. It analyses the transient response of a research reactor core after power excursions or coolant flow and/or coolant temperature changes. The THACT-RR code provides a homogeneous one-dimensional compressible fluid flow capability with an optional voiding model that estimates the void produced by sub-cooled boiling. It allows flow reversal and sub-cooled nucleate boiling. It also includes a selection of flow instability, departure from nucleate boiling, single and two-phase heat transfer correlations, and a physical properties library adapted to pressures, temperatures, and flow rates encountered in research reactors.
5. METHOD OF SOLUTION
The conservation laws are solved by the method of Characteristics coupled with an implicit finite difference technique to insure stability and convergence of the numerical scheme. The conduction equation is solved by an implicit finite difference method.
6. RESTRICTIONS OR LIMITATIONS
The code is not adapted to very fast transient problems.
7. TYPICAL RUNNING TIME
Less than 5 min CPU are necessary for the sample problem related to a IAEA Benchmark fast loss of flow transient with a constant time step of 10**-3 Sec.
8. COMPUTER HARDWARE REQUIREMENTS
9. COMPUTER SOFTWARE REQUIREMENTS
A FORTRAN compiler is required. No executables are included with the package.
a) Included Documentation:
B. Baggoura and A. Bousbia Salah: “THACT-RR - User's Guide & Validation/Benchmarking Input Data Description for the THACT-RR Code”, Ministere de l'Education Nationale (June 1993).
11. CONTENTS OF CODE PACKAGE
The package is distributed on a CD which includes source code, sample input and output files along with the documentation listed in 10a.
12. DATE OF ABSTRACT
KEYWORDS: COOLANT BOILOFF, EXCURSIONS, HEAT TRANSFER, HYDRAULICS, TRANSIENTS, VOIDS