IAEA0872 TACHY.

TACHY, BWR Fuel Management by 2-D Coarse Mesh Neutron Diffusion

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM 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 AUTHOR, MATERIAL, CATEGORIES

[ top ]

1. NAME OR DESIGNATION OF PROGRAM: TACHY.

[ top ]

2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

Program name	Package id	Status	Status date
TACHY	IAEA0872/01	Tested	08-MAR-1985

Machines used:

Package ID	Orig. computer	Test computer
IAEA0872/01	CDC CYBER 730	CDC CYBER 740

[ top ]

3. DESCRIPTION OF PROBLEM OR FUNCTION

TACHY solves the one-group two-dimensional coarse-mesh neutron diffusion equation. Average void fraction for each channel is obtain through power-void correlations which need to be obtained only once for a particular BWR by performing a few three-dimensional simulations.

The code has been developed for rapid analysis of reload patterns for BWRs which are analyzed using Haling's principle.

[ top ]

4. METHOD OF SOLUTION: Coarse-mesh finite difference method.

[ top ]

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The code is useful only for analyzing reload patterns and assumes all control rods to be out.

[ top ]

6. TYPICAL RUNNING TIME

About 3 seconds for analyzing one reload pattern considering 70 mesh points.

IAEA0872/01

NEA-DB executed the test case included in the package on CDC CYBER 740 in 11.22 seconds of CPU time.

[ top ]

7. UNUSUAL FEATURES OF THE PROGRAM:

[ top ]

8. RELATED AND AUXILIARY PROGRAMS:

[ top ]

9. STATUS

Package ID	Status date	Status
IAEA0872/01	08-MAR-1985	Tested at NEADB

[ top ]

10. REFERENCES:

IAEA0872/01, included references:

- R.P. Jain and V. Jagannathan:
  A Two Dimensional BWR Simulation Model for Rapid Reload Pattern
  Studies.  B.A.R.C./I-718  (1982)
- R.P. Jain and V. Jagannathan:
  Manager's Manual cum Guide for the Use of Computer Code 'TACHY'.
  T.R.P.S./Note/297  (May 1982)
- In-Core Fuel Management Programs for Nuclear Power Reactors
  IAEA-TECDOC-314  (October 1984)

[ top ]

11. MACHINE REQUIREMENTS

The code uses only fast memory except for basic input data.

IAEA0872/01

To run the test case on CDC CYBER 740, 60,500 (octal) words of main storage (CM) were required.

[ top ]

12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
IAEA0872/01	FORTRAN-77

[ top ]

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
NOS 1.4 L-552/552.

[ top ]

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

[ top ]

15. NAME AND ESTABLISHMENT OF AUTHOR

This code system has been included in the Coordinated Research Programme (CRP) on "Codes Adaptable to Small and Medium-Size Com- puters Available in Developing Countries for In-Core Fuel Manage- ment" of the International Atomic Energy Agency.

       R.P. Jain
       Bhabha Atomic Research Centre
       Theoretical Reactor Physics Section
       Trombay
       Bombay-400 085, India

[ top ]

16. MATERIAL AVAILABLE

IAEA0872/01

File name	File description	Records
IAEA0872_01.003	INFORMATION FILE	32
IAEA0872_01.004	JCL TO RUN THE TEST CASE	14
IAEA0872_01.005	TACHY SOURCE PROGRAM (FORTRAN-4)	654
IAEA0872_01.006	TACHY TEST CASE INPUT DATA FROM UNIT 5	14
IAEA0872_01.007	TACHY TEST CASE INPUT DATA FROM UNIT 9	44
IAEA0872_01.008	TACHY TEST CASE PRINTED OUTPUT	657

[ top ]

17. CATEGORIES

D. Depletion, Fuel Management, Cost Analysis, and Power Plant Economics

Keywords: BWR reactors, coarse mesh, diffusion equations, fuel management, power distribution, two-dimensional, voids.