NEA-1368 ARIANNA-2.
ARIANNA-2, Sub-Compartment Thermo-Hydraulic Transients in LOCA
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM 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
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| ARIANNA-2 | NEA-1368/01 | Tested | 21-OCT-1993 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NEA-1368/01 | IBM 30xx series | DEC VAX 6000 |
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3. DESCRIPTION OF PROGRAM OR FUNCTION
ARIANNA-2 allows to analyze the behaviour of a thermal-hydraulic transient following a LOCA in a
multicompartment containment system during short, medium and long term accidental sequences. The transient is described as a quasi- steady state: mass and energy flows, in each time step, are based on the thermodynamic conditions of the previous time step.. The mass and energy inventory in each volume may be modified by the contribution of heat transfer, junction flows and blow-down mass and energy inputs. The flow through the junctions can be evaluated by choosing one of the following three models: Moody, homogeneous inertial flow or orifice polytropic flow. Each control volume can be simulated as a homogeneous steam-water-air mixture or as a stagnant mixture region (atmosphere) above a liquid pool (sumps); the pool region may or may not be in thermodynamic equilibrium with the atmosphere. In the blow-down volumes, isentropic or isenthalpic expansion of the mixture jet is possible together with associated de-entrainment of liquid in the water pool.
ARIANNA-2 allows to analyze the behaviour of a thermal-hydraulic transient following a LOCA in a
multicompartment containment system during short, medium and long term accidental sequences. The transient is described as a quasi- steady state: mass and energy flows, in each time step, are based on the thermodynamic conditions of the previous time step.. The mass and energy inventory in each volume may be modified by the contribution of heat transfer, junction flows and blow-down mass and energy inputs. The flow through the junctions can be evaluated by choosing one of the following three models: Moody, homogeneous inertial flow or orifice polytropic flow. Each control volume can be simulated as a homogeneous steam-water-air mixture or as a stagnant mixture region (atmosphere) above a liquid pool (sumps); the pool region may or may not be in thermodynamic equilibrium with the atmosphere. In the blow-down volumes, isentropic or isenthalpic expansion of the mixture jet is possible together with associated de-entrainment of liquid in the water pool.
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4. METHOD OF SOLUTION
Mass and energy exchange between volumes, linked through junctions, are calculated according to the following assumptions:
- inlet and outlet pressures for each junction are equal to those of the two linked volumes;
- thermodynamic flow conditions are equal to those of the donor volume;
- flow properties are constant during the time-step and mixture flow is homogeneous.
The inertial flow is calculated on the basis of a numerical solution of the momentum equation while the orifice flow is calculated on the basis of Moody model (critical case) or ideal gas model. The heat transfer to structures is calculated solving the Fourier equation by a finite difference method; and various options make it possible to calculate heat transfer coefficients.
Mass and energy exchange between volumes, linked through junctions, are calculated according to the following assumptions:
- inlet and outlet pressures for each junction are equal to those of the two linked volumes;
- thermodynamic flow conditions are equal to those of the donor volume;
- flow properties are constant during the time-step and mixture flow is homogeneous.
The inertial flow is calculated on the basis of a numerical solution of the momentum equation while the orifice flow is calculated on the basis of Moody model (critical case) or ideal gas model. The heat transfer to structures is calculated solving the Fourier equation by a finite difference method; and various options make it possible to calculate heat transfer coefficients.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
The ARIANNA-2 program provides up to 100 volumes, 200 junctions, 30 of which can have time-dependent areas, and 100 heat conducting structures which can exchange with any combination of compartments or between any compartment and the outside atmosphere. Up to 101 mesh-points for each structure are allowed and up to 20 different material regions.
The ARIANNA-2 program provides up to 100 volumes, 200 junctions, 30 of which can have time-dependent areas, and 100 heat conducting structures which can exchange with any combination of compartments or between any compartment and the outside atmosphere. Up to 101 mesh-points for each structure are allowed and up to 20 different material regions.
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6. TYPICAL RUNNING TIME
A 2-volumes, 1-junction problem requires 0.005 s per time step of CPU time on IBM 3090.
A 2-volumes, 1-junction problem requires 0.005 s per time step of CPU time on IBM 3090.
NEA-1368/01
NEA-DB compiled the source program and executed the two test cases included in this package on a DEC VAX-6000 computer in 5m10.54s and 18.36s, respectively.[ top ]
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NEA-1368/01, included references:
- N. Cerullo, F. Oriolo and A. Pasculli:ARIANNA-2 , Un Nuovo Codice di Calcolo per l'Analisi di Transitori
Termoidraulici in Sistemi di Contenimento a Piena Pressione
(in Italian)
RL 098(84).
- M. Cascioli, N. Cerullo, W. Flospergher, F. Oriolo and S. Paci:
Implementazione e Qualifica dei Modelli di Salvaguardia
Ingegneristica del Contenimento nel Codice ARIANNA-2 (in Italian)
RL 305(87).
- N. Cerullo, A. Mandrefini, F. Oriolo and S. Paci:
Validation of the ARIANNA-2 Code on the Basis of HDR V44 and T31.5
Tests
Second International Conference on Containment Design and
Operation
Toronto (October 14/17, 1990).
- N. Cerullo, W. Flospergher, F. Oriolo and A. Pacsulli:
A Model for Thermal-Hydraulic Analysis of Transients in PWR
Containment Systems the ARIANNA-2 Computer Code
Reprint from Energia Nucleare/Anno 2/N. 3 (December 1985).
- NEA Data Bank:
Graphical Comparison of the Original IBM Results (full line) with
those Obtained on the DEC VAX 6000 (marks)
NEADB (19/10/93).
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NEA-1368/01
VAX/VMS V5.5-2 with VAX Fortran-77 compiler.[ top ]
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NEA-1368/01
| File name | File description | Records |
|---|---|---|
| NEA1368_01.001 | ARIANNA-2 information file | 190 |
| NEA1368_01.002 | ARIANNA-2 source code | 3764 |
| NEA1368_01.003 | ARIANNA-2 job control for installation | 29 |
| NEA1368_01.004 | ARIANNA-2 test input file # 1 | 110 |
| NEA1368_01.005 | ARIANNA-2 test output file # 1 | 1892 |
| NEA1368_01.006 | ARIANNA-2 test input file # 2 | 34 |
| NEA1368_01.007 | ARIANNA-2 test output file # 2 | 2002 |
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- G. Radiological Safety, Hazard and Accident Analysis
- H. Heat Transfer and Fluid Flow
Keywords: accidents, containment, energy transfer, mass transfer, pressure, reactor safety, temperature distribution.