RELAP5 SUMMARIZATION
1. Development History
AB811148157BL .
EM376772762CS
RELAP5 is a general system program for transient behavior analysis developed
by Idaho national laboratory. The program has experienced for the following process:
1966 RELAPSE; 1968 RELAP2; 1971 RELAP3 and 1975 RELAP4. The two phase
flow processing of these programs are all based on homogeneous model. The
program’s final version is RELAP4/MOD7, which is promulgated by US National
Energy Software Center in 1980. After that, the researchers used two-fluid,
non-homogeneous and non-equilibrium two-phase model, and overcame the
limitation of single fluid model to develop the RELAP5 program. By 1995,
RELAP5/MOD2 version came out. On this basis, through improving and outspread,
RELAP5/MOD3 program was developed successfully. RELAP5 has many special
functions for PWR thermal hydraulic analysis. It is a program bases on
one-dimensional transient, two fluid, six equation hydraulics, one-dimensional heat
conduction and point pile kinetics model. Furthermore, it apply mass, momentum and
energy equations for water and steam respectively. In addition to general component
model of pump, catheter, injection pump, turbine, separator, and control system,
RELAP5 also includes special process models of reflooding heat transfer, gas gap
thermal conductivity, choked flow, noncondensible gas.
RELAP5 is a general transient analysis program for thermal hydraulic system,
and its application scope includes: coolant loss accidents, running transient state,
power supply lose, flow loss and sub-cooling transient state. After a certain
development work, now RELAP5 has already been suitable for ordinary
microcomputer completely, and had corresponding graphics post-processing software
for supporting use.
2. RELAP5— 3D
RELAP5-3D, the latest in the RELAP5 series of codes, is a highly generic code,
that in addition to calculating the behavior of a reactor coolant system during a
transient, can be used for simulating of a wide variety of hydraulic and thermal
transients in both nuclear and nonnuclear systems involving mixtures of vapor, liquid,
non-condensable gases, and nonvolatile solute
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