Preliminary Investigation for Passive Post Shutdown Cooling System of Passive Compact Molten Salt Reactor (PCMSR)

Oleh: Furqon, M. H.

Passive post shutdown cooling system Passive Compact Molten Salt Reactor (PCMSR) has been preliminary investigated. This research intended to obtain diameter of holes surrounding the reactor and pressure in hotbox that is allowed for designing the cooling system. Microsoft Excel program was used to implement Green function method . This reactor has post shutdown cooling system which is integrated with reactor building  that make PCMSR has a simple building. Analysis has been done with two step. The first step is analysis pressure drop by calculating decay heat and convection heat transfer to fluid, then calculate pressure drop in each part of this system to obtain initial parameters to calculate heat capacity of gaseous, gaseous conductivity, Pr number, Nu number, overall coefficient transfer heat (U). The second step is analysis temperature in surface of reactor or in fuel so that surface temperature or fuel temperature not exceed maximum temperature that is allowed (T < 1673K). The result indicated that the cooling system safely used during 24 hours with nominal power is 500 MW, minimum pressure has been allowed 40 bar,  diameter of holes surrounding the reactor is 0.07 meter and chimney’s height is 20 meter. While flow rate between 1 kg/s up to 11 kg/s and the first highest temperature for fuel is 1480.8509419 K then decreased sharply and increased until the second highest temperature 1203.9954302 K then fuel temperature decreased again.That means this cooling system safe for used with the nominal power.

Keywords: decay heat, PCMSR, passive cooling, pressure drop, maximum temperature

Preliminary investigation for passive post shutdown cooling system Passive Compact Molten Salt Reactor (PCMSR) has been accomplished. This research intended to obtain diameter of holes surrounding the reactor and pressure in hotbox has been allowed to design this cooling system.
This reasearch has been used Microsoft Excell program using Green function method for calculated. This reactor has post shutdown coolung system which intregated with reactor building so PCMSR has a simple building. Analysis has been done with two step. The first step is analysis pressure drop with calculate decay heat and convection heat transfer to fluide which then calculate pressure drop in each part of this system to obtain parameter-parameter awal for calculate heat capacity of gaseous, gaseous conductivity, Pr number, Nu number, overall coeficient transfer heat (U), and the second step is analysis temperature in surface of reactor or in fuel so surface temperature or fuel temperature no more than maksimum temperature has been allowed (T < 1673K).
The result indicate this cooling system safe for used during 24 hours with nominal power is 500 MW, minimum pressure has been allowed 40 bar, diameter of holes surrounding the reactor is 0,07 meter and chimney height is 20 meter. While flow rate between 1 kg/s up to 11 kg/s and the first heighest temperature for fuel is 1480,8509419 K then decreased sharply and increased until the second heighest temperature 1203,9954302 K then fuel temperature decreased again.That means this cooling system safe for used with that nominal power.

Keywords: decay heat, PCMSR, analysis pasive cooling, pressure drop, maksimum temperature