JASMINE V.3: JAEA Simulator for Multiphase INteractions and Explosions.
Auxiliary Codes: GNUPLOT, an open source plotting utility.
Nuclear Safety Research Center, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki-ken, Japan, through the OECD Nuclear Energy Agency Data Bank, Issy-les-Moulineaux, France.
F90, PERL, C; Linux and Unix (C00795MNYCP00) (NEADB ID NEA-1838/01).
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. A mechanistic steam explosion simulation code, JASMINE, was developed that is applicable to plant scale assessment of the steam explosion loads.
JASMINE, JAEA Simulator for Multiphase Interactions and Explosions, is a code developed to describe the fission reactor fuel coolant interaction. 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 theta, 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.
The two flow scheme used by JASMINE can treat 2 D problems only.
Less than 10 minutes on most modern computers.
Linux or Unix environments.
Fortran90 compiler and PERL.
10.a Documentation included in package:
JASMINE 3.3b: Input Manual” Revision 2009/4/2 Modification for 3.3b (islvr option).
Kiyofumi Moriyama, Yu Maruyama, Hideo Nakamura: "Steam explosion Simulation Code JASMINE v.3 User's Guide," JAEA-Data/Code 2008-014 (July 2008).
The package is transmitted in a self-extracting executable which contains source, sample problems, documentation and reference materials.
KEYWORDS: HEAT TRANSFER, LWR