Secondary SCRAM System for Liquid Metal Cooled Nuclear Reactors: Simulation using Particle-Based Methods and Experimental Validation

Research output: ThesisDoctoral thesis

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@phdthesis{1291d9c948b64886b7cf447cb1121c2a,
title = "Secondary SCRAM System for Liquid Metal Cooled Nuclear Reactors: Simulation using Particle-Based Methods and Experimental Validation",
abstract = "One important safety aspect of any reactor is the ability to shutdown the reactor. A shutdown in a reactor can be done by lowering the multiplication factor of the reactor and thus by inserting negative reactivity. In current designs of liquid-metal-cooled GEN IV and ADS reactors reactivity insertion is based on absorber rods. Although these rod-based systems are duplicated to provide redundancy, they all have a common failure mode as a consequence of their identical operating mechanism, possible causes being a largely deformed core or blockage of the rod guidance channel. In this work an overview of existing solutions for a complementary shut down system is given and a new concept is proposed. A tube is divided into two sections by means of aluminum seal. In the upper region, above the active core, spherical neutron-absorbing boron carbide particles are placed. In case of overpower and loss of coolant transients, the seal will melt. The absorber balls are then no longer supported and fall down into the active core region inserting a large negative reactivity. This system, which is not rod based, is then further investigated by both SPH and DEM simulations as well as experiments validations.",
keywords = "SCRAM, DEM, SPH, Secondary Safety System",
author = "Simon Vanmaercke and {Van den Eynde}, Gert and {A{\"i}t Abderrahim}, Hamid",
note = "Score = 30",
year = "2012",
month = jan,
language = "English",
publisher = "UCL - Universit{\'e} Catholique de Louvain",
school = "UCL - Universit{\'e} catholique de Louvain ",

}

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TY - THES

T1 - Secondary SCRAM System for Liquid Metal Cooled Nuclear Reactors: Simulation using Particle-Based Methods and Experimental Validation

AU - Vanmaercke, Simon

A2 - Van den Eynde, Gert

A2 - Aït Abderrahim, Hamid

N1 - Score = 30

PY - 2012/1

Y1 - 2012/1

N2 - One important safety aspect of any reactor is the ability to shutdown the reactor. A shutdown in a reactor can be done by lowering the multiplication factor of the reactor and thus by inserting negative reactivity. In current designs of liquid-metal-cooled GEN IV and ADS reactors reactivity insertion is based on absorber rods. Although these rod-based systems are duplicated to provide redundancy, they all have a common failure mode as a consequence of their identical operating mechanism, possible causes being a largely deformed core or blockage of the rod guidance channel. In this work an overview of existing solutions for a complementary shut down system is given and a new concept is proposed. A tube is divided into two sections by means of aluminum seal. In the upper region, above the active core, spherical neutron-absorbing boron carbide particles are placed. In case of overpower and loss of coolant transients, the seal will melt. The absorber balls are then no longer supported and fall down into the active core region inserting a large negative reactivity. This system, which is not rod based, is then further investigated by both SPH and DEM simulations as well as experiments validations.

AB - One important safety aspect of any reactor is the ability to shutdown the reactor. A shutdown in a reactor can be done by lowering the multiplication factor of the reactor and thus by inserting negative reactivity. In current designs of liquid-metal-cooled GEN IV and ADS reactors reactivity insertion is based on absorber rods. Although these rod-based systems are duplicated to provide redundancy, they all have a common failure mode as a consequence of their identical operating mechanism, possible causes being a largely deformed core or blockage of the rod guidance channel. In this work an overview of existing solutions for a complementary shut down system is given and a new concept is proposed. A tube is divided into two sections by means of aluminum seal. In the upper region, above the active core, spherical neutron-absorbing boron carbide particles are placed. In case of overpower and loss of coolant transients, the seal will melt. The absorber balls are then no longer supported and fall down into the active core region inserting a large negative reactivity. This system, which is not rod based, is then further investigated by both SPH and DEM simulations as well as experiments validations.

KW - SCRAM

KW - DEM

KW - SPH

KW - Secondary Safety System

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_120866

M3 - Doctoral thesis

PB - UCL - Université Catholique de Louvain

CY - Louvain la Neuve, Belgium

ER -

ID: 86742