Computer Programs

NESC9940 THERMIT-2.

NESC9940 THERMIT-2.

THERMIT-2, 3-D Thermo-Hydraulics of BWR and PWR

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

[ top ]

1. NAME OR DESIGNATION OF PROGRAM: THERMIT-2

[ top ]

2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Rules for end-users are available here.

Program name	Package id	Status	Status date
THERMIT-2	NESC9940/01	Tested	20-JUL-1984

Machines used:

Package ID	Orig. computer	Test computer
NESC9940/01	IBM 370 series	IBM 3081

[ top ]

3. DESCRIPTION OF PROGRAM OR FUNCTION

THERMIT-2, the most recent release of THERMIT, is intended for thermal-hydraulic analysis of both boiling and pressurized water reactor cores. It solves the three-dimensional, two-fluid equations describing the two-phase flow and heat transfer dynamics in rectangular coordinates. The two-fluid model uses separate partial differential equations expressing conservation of mass, momentum, and energy for each fluid. THERMIT2 offers the choice of either pressure or velocity boundary conditions at the top and bottom of the core. THERMIT2 includes a two-phase turbulent mixing model which provides subchannel analysis capability. THERMIT2 also solves the radial heat conduction equations for fuel pin temperatures, and calculates the heat flux from fuel pin to coolant with appropriate heat transfer models described by a boiling curve.

[ top ]

4. METHOD OF SOLUTION

By expressing the exchange of mass, momentum, and energy between the fluids with physically-based mathematical models, the relative motion and thermal non-equilibrium between the fluids can exist.

[ top ]

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

[ top ]

6. TYPICAL RUNNING TIME:

[ top ]

7. UNUSUAL FEATURES OF THE PROGRAM:

[ top ]

8. RELATED AND AUXILIARY PROGRAMS

THERMIT-2 contains proprietary subroutines LEQT1B, UERTST, and UGETIO from the IMSL library. These routines may not be removed from this software for use in other software.

[ top ]

9. STATUS

Package ID	Status date	Status
NESC9940/01	20-JUL-1984	Tested at NEADB

[ top ]

10. REFERENCES:

NESC9940/01, included references:

- J.E.Kelly, S.P.Kao and M.S.Kazimi:
User's Guide for THERMIT-2: AVersion of THERMIT for Both Core-Wide and
Subchannel Analysis of Light Water Reactor. MIT-EL-81-029 (August 1981)

[ top ]

11. MACHINE REQUIREMENTS: 260K bytes main storage.

[ top ]

12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC9940/01	FORTRAN-IV

[ top ]

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

[ top ]

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

[ top ]

15. NAME AND ESTABLISHMENT OF AUTHORS

      M.S. Kazimi, S.P. Kao, and J.E. Kelly
      Massachusetts Institute of Technology
      Department of Nuclear Engineering
      77 Massachusetts Avenue
      Cambridge, Massachusetts 02139

[ top ]

16. MATERIAL AVAILABLE

NESC9940/01

File name	File description	Records
NESC9940_01.003	THERMIT-2 INFORMATION FILE	81
NESC9940_01.004	THERMIT-2 SOURCE (CARD-IMAGES)	5879
NESC9940_01.005	THERMIT-2 SOURCE (INPUT TO IEBUPDTE)	5944
NESC9940_01.006	JCL TO GENERATE LOAD MODULE	42
NESC9940_01.007	JCL FOR TEST CASE EXECUTION	30
NESC9940_01.008	THERMIT-2 INPUT DATA FOR TEST CASE 1	36
NESC9940_01.009	THERMIT-2 INPUT DATA FOR TEST CASE 2	36
NESC9940_01.010	THERMIT-2 INPUT DATA FOR TEST CASE 3	7
NESC9940_01.011	THERMIT-2 PRINTED OUTPUT OF TEST CASE 1	536
NESC9940_01.012	THERMIT-2 PRINTED OUTPUT OF TEST CASE 2	491
NESC9940_01.013	THERMIT-2 PRINTED OUTPUT OF TEST CASE 3	1179

[ top ]

17. CATEGORIES

H. Heat Transfer and Fluid Flow

Keywords: BWR reactors, fluid flow, heat transfer, pwr reactors, steady-state conditions, three-dimensional, transients, two-phase flow.