Simulation of a gas-cooled fluidized bed nuclear reactor. Part II

stability of a fluidized bed reactor with mixed oxide fuels

Bryan E. Milles (Corresponding Author), Christopher C. Pain, Jefferson L. M. A. Gomes

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Fertile materials can be converted by nuclear reaction into a transuranic mixture with a fissile content, mostly plutonium isotopes. Fuel which includes a limited proportion of plutonium is already used in some reactors. Use is restricted by the smaller delayed neutron yield and lower negative temperature coefficient of reactivity compared with uranium fuels.

A reactor with an additional stability feedback would make possible an increased use of plutonium fuels. This feedback mechanism is present in a novel conceptual High Temperature Gas Cooled Reactor (HTGR) where the TRISO particles are fluidized by the coolant gas.

Spatial and time dependent simulations using the coupled Radiation Transport and Computational Multiphase Fluid Dynamic code FETCH are applied to investigations of this stability. The reactor has been investigated using plutonium fuel of various isotopic compositions. The temperature coefficient of reactivity may not be negative, depending on the isotopic composition of the fuel. The reactor is found stable. The amplitudes of power fluctuations increase however. These cause fluctuations in fuel temperature which can be excessive unless the average power is reduced, compared with that produced from a uranium fuel.

The time dependent calculations are repeated using, in the neutron transport, data representing hypothetical fuels with zero temperature coefficient and/or zero delayed neutron yield.
Original languageEnglish
Pages (from-to)1014-1025
Number of pages12
JournalAnnals of Nuclear Energy
Volume37
Issue number7
DOIs
Publication statusPublished - Jul 2010

Fingerprint

Mixed oxide fuels
Nuclear reactors
Fluidized beds
Plutonium
Gases
Neutrons
Uranium
Negative temperature coefficient
Feedback
High temperature gas reactors
Nuclear reactions
Fluid dynamics
Chemical analysis
Coolants
Temperature
Isotopes
Radiation

Keywords

  • fluidized bed reactor
  • coupled radiation transport multiphase fluid dynamics
  • FETCH
  • transient
  • plutonium

Cite this

Simulation of a gas-cooled fluidized bed nuclear reactor. Part II : stability of a fluidized bed reactor with mixed oxide fuels. / Milles, Bryan E. (Corresponding Author); Pain, Christopher C.; Gomes, Jefferson L. M. A.

In: Annals of Nuclear Energy, Vol. 37, No. 7, 07.2010, p. 1014-1025.

Research output: Contribution to journalArticle

@article{7e7e89e8b4e94104b9d85ecf9dab0787,
title = "Simulation of a gas-cooled fluidized bed nuclear reactor. Part II: stability of a fluidized bed reactor with mixed oxide fuels",
abstract = "Fertile materials can be converted by nuclear reaction into a transuranic mixture with a fissile content, mostly plutonium isotopes. Fuel which includes a limited proportion of plutonium is already used in some reactors. Use is restricted by the smaller delayed neutron yield and lower negative temperature coefficient of reactivity compared with uranium fuels.A reactor with an additional stability feedback would make possible an increased use of plutonium fuels. This feedback mechanism is present in a novel conceptual High Temperature Gas Cooled Reactor (HTGR) where the TRISO particles are fluidized by the coolant gas.Spatial and time dependent simulations using the coupled Radiation Transport and Computational Multiphase Fluid Dynamic code FETCH are applied to investigations of this stability. The reactor has been investigated using plutonium fuel of various isotopic compositions. The temperature coefficient of reactivity may not be negative, depending on the isotopic composition of the fuel. The reactor is found stable. The amplitudes of power fluctuations increase however. These cause fluctuations in fuel temperature which can be excessive unless the average power is reduced, compared with that produced from a uranium fuel.The time dependent calculations are repeated using, in the neutron transport, data representing hypothetical fuels with zero temperature coefficient and/or zero delayed neutron yield.",
keywords = "fluidized bed reactor, coupled radiation transport multiphase fluid dynamics, FETCH, transient, plutonium",
author = "Milles, {Bryan E.} and Pain, {Christopher C.} and Gomes, {Jefferson L. M. A.}",
year = "2010",
month = "7",
doi = "10.1016/j.anucene.2010.03.009",
language = "English",
volume = "37",
pages = "1014--1025",
journal = "Annals of Nuclear Energy",
issn = "0306-4549",
publisher = "Elsevier Limited",
number = "7",

}

TY - JOUR

T1 - Simulation of a gas-cooled fluidized bed nuclear reactor. Part II

T2 - stability of a fluidized bed reactor with mixed oxide fuels

AU - Milles, Bryan E.

AU - Pain, Christopher C.

AU - Gomes, Jefferson L. M. A.

PY - 2010/7

Y1 - 2010/7

N2 - Fertile materials can be converted by nuclear reaction into a transuranic mixture with a fissile content, mostly plutonium isotopes. Fuel which includes a limited proportion of plutonium is already used in some reactors. Use is restricted by the smaller delayed neutron yield and lower negative temperature coefficient of reactivity compared with uranium fuels.A reactor with an additional stability feedback would make possible an increased use of plutonium fuels. This feedback mechanism is present in a novel conceptual High Temperature Gas Cooled Reactor (HTGR) where the TRISO particles are fluidized by the coolant gas.Spatial and time dependent simulations using the coupled Radiation Transport and Computational Multiphase Fluid Dynamic code FETCH are applied to investigations of this stability. The reactor has been investigated using plutonium fuel of various isotopic compositions. The temperature coefficient of reactivity may not be negative, depending on the isotopic composition of the fuel. The reactor is found stable. The amplitudes of power fluctuations increase however. These cause fluctuations in fuel temperature which can be excessive unless the average power is reduced, compared with that produced from a uranium fuel.The time dependent calculations are repeated using, in the neutron transport, data representing hypothetical fuels with zero temperature coefficient and/or zero delayed neutron yield.

AB - Fertile materials can be converted by nuclear reaction into a transuranic mixture with a fissile content, mostly plutonium isotopes. Fuel which includes a limited proportion of plutonium is already used in some reactors. Use is restricted by the smaller delayed neutron yield and lower negative temperature coefficient of reactivity compared with uranium fuels.A reactor with an additional stability feedback would make possible an increased use of plutonium fuels. This feedback mechanism is present in a novel conceptual High Temperature Gas Cooled Reactor (HTGR) where the TRISO particles are fluidized by the coolant gas.Spatial and time dependent simulations using the coupled Radiation Transport and Computational Multiphase Fluid Dynamic code FETCH are applied to investigations of this stability. The reactor has been investigated using plutonium fuel of various isotopic compositions. The temperature coefficient of reactivity may not be negative, depending on the isotopic composition of the fuel. The reactor is found stable. The amplitudes of power fluctuations increase however. These cause fluctuations in fuel temperature which can be excessive unless the average power is reduced, compared with that produced from a uranium fuel.The time dependent calculations are repeated using, in the neutron transport, data representing hypothetical fuels with zero temperature coefficient and/or zero delayed neutron yield.

KW - fluidized bed reactor

KW - coupled radiation transport multiphase fluid dynamics

KW - FETCH

KW - transient

KW - plutonium

U2 - 10.1016/j.anucene.2010.03.009

DO - 10.1016/j.anucene.2010.03.009

M3 - Article

VL - 37

SP - 1014

EP - 1025

JO - Annals of Nuclear Energy

JF - Annals of Nuclear Energy

SN - 0306-4549

IS - 7

ER -