Loss-of-coolant accident

Engineering

Heat transfer

Condenser (optics)

Evaporator

Nuclear power

Nuclear physics

Natural circulation

Pressurized water reactor

Passive cooling

Heat exchanger

Decay heat

Waste management

Mechanical engineering

Physics

Nuclear engineering

Optics

Heat pipe

Heat sink

Nuclear reactor core

Light source

Mechanics

Nuclear power plant

Nuclear reactor

Water cooling

Shutdown

Coolant

Loop heat pipe

Applied Thermal Engineering

On March 11th, 2011, a natural disaster created by earthquakes and Tsunami caused a serious potential of nuclear reactor meltdown in Fukushima due to the failure of Emergency Core Cooling System (ECCS) powered by diesel generators. In this paper, heat pipe based ECCS has been proposed for nuclear power plants. The designed loop type heat pipe ECCS is composed of cylindrical evaporator with 62 vertical tubes, each 150 mm diameter and 6 m length, mounted around the circumference of nuclear fuel assembly and 21 m × 10 m × 5 m naturally cooled finned condenser installed outside the primary containment. Heat pipe with overall thermal resistance of 1.44 × 10−5 °C/W will be able to reduce reactor temperature from initial working temperature of 282 °C to below 250 °C within 7 h. The overall ECCS also includes feed water flooding of the core using elevated water tank for initial 10 min which will accelerate cooling of the core, replenish core coolant during loss of coolant accident and avoids heat transfer crisis phenomena during heat pipe start-up process. The proposed heat pipe system will operate in fully passive mode with high runtime reliability and therefore provide safer environment to nuclear power plants.

Heat pipe based passive emergency core cooling system for safe shutdown of nuclear power reactor