NESC0745 MATADOR.

1. NAME OR DESIGNATION OF PROGRAM:  MATADOR.

3. DESCRIPTION OF PROBLEM OR FUNCTION

MATADOR analyzes the transport  and deposition of radionuclides as vapor or aerosol through Light Water Reactor (LWR) containments during severe accidents and calculates environmental release fractions of radionuclides as a function of time. It is intended for use in system risk studies. The principal output is information on the timing and magnitude of radionuclides releases to the environment as a result of severely degraded core accidents. MATADOR considers the transport of radionuclides through the containment and their removal by natural deposition and the operation of engineered safety systems such as sprays. Input data on the source term from the primary system, the containment geometry and thermal-hydraulic conditions are required.

4. METHOD OF SOLUTION

The containment is modeled as a series of interconnected control volumes. In each control volume, radionuclides can be in any of four different states: suspended in the atmosphere, deposited on the walls, picked up by spray water droplets, or residing in bulk water in the sump or on the containment floor. If the physical form of the radionuclides is aerosols, these states are further divided into size classes. Radionuclides can also be picked up and collected by engineered safety systems such as filters, ice condensers, and pressure suppression pools. Radionuclides can transfer from one state to another within each compartment as a result of processes such as deposition on the walls or spray water droplet pickup. They can also transfer from one compartment to another through inter-compartmental flows. A linear first-order differential equation is written for each species in each state and control volume to account for the transfer of species between states in a control volume or between control volumes. These equations are assembled into a matrix equation and solved simultaneously using the matrix expansion technique with scaling. The aerosol agglomeration and gravitational  settling calculations are done in series over each time-step using the moments approach. The discrete aerosol size distribution is converted to a log-normal distribution for agglomeration calculations. After these calculations, it is converted back into a
discrete distribution for transport calculations over the next time- step. Care is taken to conserve the total aerosol mass as well as individual species masses between conversions. The time-step size is regulated so that the two sets of calculations do not unduly affect  each other.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   10 interconnected control volumes
   10 chemical species
   10 kinetic transport processes
   10 discrete size classes for aerosols
Application is limited to LWR systems. Noble gases are assumed to simply transfer in phase with the fluid flow and not deposit on the  surfaces or be affected by engineered safety systems.

6. TYPICAL RUNNING TIME

A typical problem covering 1 hour of accident time without or with sprays operating requires 8 or 50 CP seconds, respectively, on a CDC CYBER180/855. Execution time increases by a factor of 1.5 on a CDC CYBER74 and by a factor of 6 on a CDC CYBER73. NESC executed the sample problem in 5 CP seconds on a CDC CYBER170/875.

NEA-DB ran the test case included in this package on a  CDC CYBER 740 computer in 17 seconds of CPU time.

The test cases included in this package ran at NEA-DB on an IBM 3090 computer in 6.5 seconds of CPU time.

7. UNUSUAL FEATURES OF THE PROGRAM

MATADOR treats both vapor and aerosol behavior and can be used for both PWR and BWR applications.

8. RELATED AND AUXILIARY PROGRAMS

MATADOR was developed to replace the CORRAL2 program. A physical processes program such as MARCH2, NESC Abstract 734, can be used to generate the thermal-hydraulic data required by MATADOR. MATADOR can directly accept source terms calculated by the TRAP-MELT program. The environmental radionuclide  release fractions calculated by MATADOR can be used in a radiological consequence program such as CRAC2, Nesc Abstract 722, to calculate the health effects of reactor accidents.

10. REFERENCES

- H.I. Avci, S. Raghuram, and P. Baybutt,
  MATADOR (Methods for the Analysis of Transport and Deposition of
  Radionuclides) Code Description and User's Manual,
  NUREG/CR-4211 (BMI-2126), April 1985.
- H. Jordan, J.A. Gieseke, and P. Baybutt,
  TRAP-MELT User's Manual,
  NUREG/CR-0632 (BMI-2017), February 1979.
- R.O. Wooton, P. Cybulskis, and S.F. Quayle,
  MARCH2 (Meltdown Accident Response CHaracteristics) Code
  Description and User's Manual,
  NUREG/CR-3988 (BMI-2115), September 1984.
- Lynn T. Ritchie, Jay D. Johnson, and Roger M. Blond,
  Calculations of Reactor Accident Consequences Version 2 CRAC:
  Computer Code User's Guide,
  NUREG/CR-2326 (SAND81-1994), February 1983.

- L. Eyberger:
  MATADOR Tape Description and Implementation Information.
  NESC Note 85-72  (April 18, 1985)
- P. Baybutt, S. Raghuram and H.I. Avci:
  MATADOR: A Computer Code for the  Analysis of Radionuclide
  Behavior During Degraded Core Accidents in Light Water Reactors.
  NUREG/CR-4210, BMI-2125  (April 1985)
- P. Baybutt, S. Raghuram and H.I. Avci:
  MATADOR (Methods for the Analysis of Transport And Deposition Of
  Radionuclides) Code Description and User's Manual.
  NUREG/CR-4211, BMI-2126  (April 1985)
- P. Baybutt, S. Raghuram and H.I. Avci:
  MATADOR: A Computer Code for the  Analysis of Radionuclide
  Behavior During Degraded Core Accidents in Light Water Reactors.
  NUREG/CR-4210, BMI-2125  (April 1985)
- P. Baybutt, S. Raghuram and H.I. Avci:
  MATADOR (Methods for the Analysis of Transport And Deposition Of
  Radionuclides) Code Description and User's Manual.
  NUREG/CR-4210, BMI-2126  (April 1985)

11. MACHINE REQUIREMENTS

MATADOR requires, without segmentation, approximately 335,000 (octal) words of central memory (SCM) and 116,000 (octal) words of extended core storage (ECS). NESC executed  the sample problem using the program and reducing the dimensions of  several arrays as outlined in the user's manual.

To run the test case of this package on CDC CYBER 740,  263,700 (octal) words of CM are required.

The test case ran on an IBM 3090 in 812K bytes of main  storage.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  NOS 2.3, NOS/BE 2.2, NOS 2.2 (CDC CYBER170).

The test case was run under NOS 1.4+531 (CYBER 740).

The test was executed under MVS/XA (IBM 3090).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHOR

         H.I. Avci, P. Baybutt, and S. Raghuram
         Columbus Laboratories
         Battelle Memorial Institute
         505 King Avenue
         Columbus, Ohio  43201

File name	File description	Records
NESC0745_03.001	information file	63
NESC0745_03.002	job control instructions	32
NESC0745_03.003	MATADOR source program (FORTRAN)	5121
NESC0745_03.004	MATADOR UPDATE source program	4935
NESC0745_03.005	MATADOR UPDATE corrections	31
NESC0745_03.006	SEGLOAD directives	15
NESC0745_03.007	MATADOR test case input data	684
NESC0745_03.008	MATADOR test case printed output	2805

File name	File description	Records
NESC0745_04.001	INFORMATION FILE	72
NESC0745_04.002	MATADOR FORTRAN SOURCE	5172
NESC0745_04.003	ORIGINAL JCL	48
NESC0745_04.004	JCL USED FOR TESTING	121
NESC0745_04.005	SAMPLE CASE INPUT	684
NESC0745_04.006	ORIGINAL SAMPLE CASE OUTPUT	2907
NESC0745_04.007	SAMPLE CASE OUTPUT OBTAINED ON TEST COMPUTER	2805