NESC0443 HAA3B
HAA3B, Heterogeneous Aerosol Transport after LMFBR Accidents, Lognormal Size Distribution
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 AUTHORS, MATERIAL, CATEGORIES
[ top ]
[ top ]
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 |
|---|---|---|---|
| HAA-3 | NESC0443/01 | Tested | 01-MAY-1979 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NESC0443/01 | IBM 360 series | IBM 360 series |
[ top ]
3. DESCRIPTION OF PROBLEM OR FUNCTION
HAA3B was written to provide an engineering method for calculating heterogeneous aerosol behavior and transport following various hypothetical LMFBR accidents. HAA3B evaluates an approximation to the general integro-differential equation which describes aerosol behavior. The physical model includes particle generation, Brownian and gravitational agglomeration, settling, plating, and leakage for spherical particles. The approximation is the requirement that the size distribution function be lognormal.
HAA3B was written to provide an engineering method for calculating heterogeneous aerosol behavior and transport following various hypothetical LMFBR accidents. HAA3B evaluates an approximation to the general integro-differential equation which describes aerosol behavior. The physical model includes particle generation, Brownian and gravitational agglomeration, settling, plating, and leakage for spherical particles. The approximation is the requirement that the size distribution function be lognormal.
[ top ]
4. METHOD OF SOLUTION
HAA3B employs a time-dependent lognormal distribution when agglomeration is prevalent, then switches to a stirred-settling model. The time-dependent parameters which characterize the lognormal size-distribution function are obtained by numerical integration of three simultaneous differential equations for the zeroth through the second volume moments. The volume moments differential equations were obtained by analytic integration of the appropriate moments of the integro-differential equation. Additional differential equations for the plated, settled, and leaked functions are included in the simultaneous set; a mix of Adams-Moulton, Runge-Kutta, and Gaussian procedures are used to solve the system of simultaneous, first-order differential equations.
HAA3B employs a time-dependent lognormal distribution when agglomeration is prevalent, then switches to a stirred-settling model. The time-dependent parameters which characterize the lognormal size-distribution function are obtained by numerical integration of three simultaneous differential equations for the zeroth through the second volume moments. The volume moments differential equations were obtained by analytic integration of the appropriate moments of the integro-differential equation. Additional differential equations for the plated, settled, and leaked functions are included in the simultaneous set; a mix of Adams-Moulton, Runge-Kutta, and Gaussian procedures are used to solve the system of simultaneous, first-order differential equations.
[ top ]
5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
Maxima of -
1000 time-steps in lognormal model part
42 discrete radii for leakage distribution calculations
50 leak-rate input values
50 source-rate input values
Applicability has been verified for moderate concentrations in moderate-sized vessels, and for limited types of sources, only.
Maxima of -
1000 time-steps in lognormal model part
42 discrete radii for leakage distribution calculations
50 leak-rate input values
50 source-rate input values
Applicability has been verified for moderate concentrations in moderate-sized vessels, and for limited types of sources, only.
[ top ]
[ top ]
7. UNUSUAL FEATURES OF THE PROGRAM
The program computes plated, settled, suspended, and leaked masses, distribution parameters, and effective radii. It prepares input cards, which describe leaked mass, for use in evaluating aerosol behavior in a second compartment, has a Klyacho correction calculation, and includes input parameters to characterize effective density and collision efficiency.
The program computes plated, settled, suspended, and leaked masses, distribution parameters, and effective radii. It prepares input cards, which describe leaked mass, for use in evaluating aerosol behavior in a second compartment, has a Klyacho correction calculation, and includes input parameters to characterize effective density and collision efficiency.
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
NESC0443/01
| File name | File description | Records |
|---|---|---|
| NESC0443_01.001 | INFORMATION | 5 |
| NESC0443_01.002 | SOURCE PROGRAM (F4,EBCDIC) | 2119 |
| NESC0443_01.003 | SAMPLE PROBLEM INPUT DATA | 18 |
| NESC0443_01.004 | SAMPLE PROBLEM PRINTED OUTPUT | 816 |
| NESC0443_01.005 | JCL | 4 |
[ top ]
- G. Radiological Safety, Hazard and Accident Analysis
- R. Environmental and Earth Sciences
Keywords: aerosols, agglomeration, leaks, particle size.