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NEA-1838 JASMINE V.3.

JASMINE V.3, Steam explosion simulation

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1. NAME OR DESIGNATION OF PROGRAM:  JASMINE V.3
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2. COMPUTERS
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Program name Package id Status Status date
JASMINE V.3 NEA-1838/01 Tested 21-JUL-2011

Machines used:

Package ID Orig. computer Test computer
NEA-1838/01 Linux-based PC,UNIX W.S. Linux-based PC
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3. DESCRIPTION OF PROGRAM OR FUNCTION

A steam explosion occurs when hot liquid contacts with cold volatile liquid. In this phenomenon, fine fragmentation of the hot liquid causes extremely rapid heat transfer from the hot liquid to the cold volatile liquid, and explosive vaporization, bringing shock waves and destructive forces. The steam explosion due to the contact of the molten core material and coolant water during severe accidents of light water reactors has been regarded as a potential threat to the integrity of the containment vessel. We developed a mechanistic steam explosion simulation code, JASMINE, that is applicable to plant scale assessment of the steam explosion loads.
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4. METHODS

JASMINE is a code developed to describe the fission reactor Fuel Coolant Interaction it stays for JAEA Simulator for Multiphase Interactions and Explosions. Two processes are treated: the premixing (molten fuel and coolant) and the explosion with different behavior and time scale.
JASMINE consists of two separate models: a molten core behavior model and a multiphase flow model. For the explosion an additional component is attached for the fragments treatment.
The domain considered is a cylindrical sector (r-z) with azimuthal angle tetha, with melt jet, melt pool , two phase premixing of the coolant, and fragments treatment in the explosion.
The molten model called MELT uses one dimensional conservation equations in z direction for the melt jet.  The same is done in radial direction for the melt pool.
Particles formed during melting and heat exchange are treated by Lagrangian with energy and motion conservation. The multiphase flow model is an extension of the ACE3D code.
Hydrodynamic drag is included.
In case of explosion a special treatment is done considering heat transfer and conservation laws.
Coupling of melt and two-phase models is made.
The methods applied to solve equations on a 3-D grid mesh are the cubic-interpolated pseudo particle and the finite difference method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The two flow scheme used by JASMINE can treat 2 D problems only.
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6. TYPICAL RUNNING TIME

Test cases can require till 10 minutes CPU order of magnitude on linux UBUNTU virtual machine running on PC Intel 686 32 bit 512 MB RAM
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7. UNUSUAL FEATURES
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8. RELATED OR AUXILIARY PROGRAMS

Gnuplot version 4.2 is provided with the package and used to run some test cases and show results.
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9. STATUS
Package ID Status date Status
NEA-1838/01 21-JUL-2011 Tested at NEADB
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10. REFERENCES
NEA-1838/01, included references:
- Kiyofumi MORIYAMA, Yu MARUYAMA, Hideo NAKAMURA:
"Steam explosion Simulation Code JASMINE v.3 User's Guide"
JAEA-Data/Code 2008-014, July 2008
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11. HARDWARE REQUIREMENTS

The following environment is recommended for the usage of JASMINE "as it is".
- Unix-like environment
  Hardware: Intel Pentium compatible PCs
  OS: Linux Workstation (Vine Linux was used for JASMINE development/maintenance.)
  GUI: X11R6-compatible window system (for display of the calculation results via gnuplot, for GUI of the debugger software)
- Fortran compiler:
  Absoft Fortran95 is recommended. Other compilers should work. Some need modification in the I/O device ID numbers.
- perl(ver.5.x) for post processing of the output.
- gnuplot(ver.4.2) for visualization of calculation results.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1838/01 FORTRAN
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13. SOFTWARE REQUIREMENTS
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Porting to MS-Windows or any other OS should be possible, because the program
itself is written in Fortran. However, it would be a tremendous puzzle to port
all the facilities including compilation by "make", post processing
by perl scripts and gnuplot scripts.
If only Windows based computer is available, installing a virtual Linux
machine by VMware (or any other virtualization tools) seems to be the easiest
way.
Under Linux, makefile in src directory should be modified to comply with the compiler to be used.
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15. NAME AND ESTABLISHMENT OF AUTHORS

Kiyofumi MORIYAMA, Yu MARUYAMA, Hideo NAKAMURA
Reactor Safety Research Unit
Nuclear Safety Research Center
Japan Atomic Energy Agency
Tokai-mura, Naka-gun, Ibaraki-ken
Japan
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16. MATERIAL AVAILABLE
NEA-1838/01
ace3d/ ACE3D source tree
melt/ MELT source tree
wrsttab/ wide range steam table tree
post/  process programs
tool/  post process scripts
bin/   place to hold binary (executable) files
doc/   manual, sample inputs and report docs
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • H. Heat Transfer and Fluid Flow

Keywords: LWR reactors, fuel coolant interaction, heat transfer, light-water reactors, molten core, propagation, safety assessment, severe accident, steam explosion.