RSICC CODE PACKAGE PSR-401

1. NAME AND TITLE

HAARM-3: Aerosol Behavior Log-Normal Distribution Model.

2. CONTRIBUTORS

Battelle Columbus Laboratories, Columbus, Ohio, through the Energy Science and Technology Software Center, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Fortran IV, FTN4.5; CDC7600, CDC6400 (P00401CDCMF00).

4. NATURE OF PROBLEM SOLVED

HAARM3, an acronym for Heterogeneous Aerosol Agglomeration Revised Model 3, is the third program in the HAARM series developed to predict the time-dependent behavior of radioactive aerosols under postulated LMFBR accident conditions. HAARM3 was developed to include mechanisms of aerosol growth and removal which had not been accounted for in the earlier models. In addition, experimental measurements obtained on sodium oxide aerosols have been incorporated in the code. As in HAARM2, containment gas temperature, pressure, and temperature gradients normal to interior surfaces are permitted to vary with time. The effects of reduced density on sodium oxide agglomerate behavior and of nonspherical shape of particles on aerosol behavior mechanisms are taken into account, and aerosol agglomeration due to turbulent air motion is considered. Also included is a capability to calculate aerosol concentration attenuation factors and to restart problems requiring long computing times.

5. METHOD OF SOLUTION

HAARM3 assumes the time-dependent particle size distribution is log-normal and converts the integro-differential equation describing the concentration decay of aerosol into three first-order differential equations which are integrated using a standard library subroutine. The present model allows the method of integration to be specified. The choices are: Adams Moulton with either a fixed or variable step-size and Runge-Kutta with a fixed step-size.

6. RESTRICTIONS OR LIMITATIONS

Maxima of 1000 time-steps and 42 discrete radii for the distribution calculations.

7. TYPICAL RUNNING TIME

The sample problems each take 1 second of CP time on a CDC7600.

8. COMPUTER HARDWARE REQUIREMENTS

117,000 (octal) words of storage were required on CDC CYBER73 and CDC7600.

9. COMPUTER SOFTWARE REQUIREMENTS

HAARM-3 ran under NOS/BE 1.0 on CDC CYBER73 and under SCOPE 2.1.3 on CDC7600 computers. This version was tested at NESC on a CDC 7600 in March 1980. It was neither modified nor tested when transferred to RSICC and released in October 2001.

10. REFERENCES

a) Included in document:

J.A. Gieseke, K.W. Lee, and L.D. Reed, "HAARM-3 Users Manual," BMI-NUREG-1991 with Errata (January 5, 1978).

K.W. Lee, J.A. Gieseke, and L.D. Reed, "Sensitivity Analysis of the HAARM-3 Code," NUREG/CR-0527, BMI-2008 (November 1978).

b) Background references:

J.A. Gieseke, L.D. Reed, H. Jordan, and K.W. Lee, "Characteristics of Agglomerates of Sodium Oxide Aerosol Particles," BMI-NUREG-1977 (August 1, 1977).

L.D. Reed and J.A. Gieseke, "HAARM-1 Users Manual," BMI-X-658 (May 15, 1975).

L.D. Reed and J.A. Gieseke, "HAARM-2 Users Manual," BMI-X-665 (October 31, 1975).

R.S. Hubner, E.U. Vaughan, and L. Baurmash, "HAA-3 User Report," AI-AEC-13038 (March 1973).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents in 10.a and a DS/HD diskette which includes a self-extracting, compressed DOS file with the CDC source code and sample case input. Note that this code was written for a CDC computer and has not been ported to other platforms.

12. DATE OF ABSTRACT

October 2001.

KEYWORDS: AEROSOL; REACTOR ACCIDENT; RADIOACTIVITY RELEASE