1. NAME AND TITLE

SACHET: A Computer Program To Evaluate The Dynamic Fission Product Inventories In The Multiple Compartment System Of PWR's

2. CONTRIBUTOR

University of Tokyo, Japan, through NEA Data Bank, Gif-sur-Yvette, Cedex, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; VAX 8810.

4. NATURE OF PROBLEM SOLVED

SACHET evaluates the dynamic fission (FP) product inventories in the multiple compartment system of pressurized water reactor plants.

5. METHOD OF SOLUTION

SACHET utilizes a matrix of the fission product core inventory which is obtained from the ORIGEN2 code (CCC-371). In normal operation, operating power equilibrium FP source terms and escape rates are used. Iodine spiking phenomena after reactor shutdown are also considered. A source term of the FP inventories in the secondary system is considered. This is the leakage of the radioactive FP's from the primary coolant through a steam generator defect. Accidental air containment systems are included to reduce the activities of the containment atmosphere.

6. RESTRICTIONS OR LIMITATIONS

Liquid wastes such as chemical and detergent wastes are not included.

7. TYPICAL RUNNING TIME

On the VAX 8810 at NEA Data Bank, sample problem 1 took 240 seconds; sample problem 2 took 120 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

SACHET runs on the VAX 8810.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Fortran IV. On the VAX 8810, the compiler used was VAX Fortran under the VMS version 5.1 operating system.

10. REFERENCES

SACHET Code Manual, informal document.

H. Kodaira, S. Kondo and Y. Togo, "Application of a Computer-Based Operator Instruction System To Plant Diagnosis On Fission Product Transport and Release In Nuclear Power Plants," J. Nuclear Science and Technology, Vol. 22, No. 10, pp. 802--817 (October 1985).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one DS/HD (1.2 MB) 5.25 inch diskette.

12. DATE OF ABSTRACT

December 1990.