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Title: Burnable absorber arrangement for fuel bundle

Abstract

This patent describes a boiling water reactor core whose operation is characterized by a substantial proportion of steam voids with concomitantly reduced moderation toward the top of the core when the reactor is in its hot operating condition. The reduced moderation leads to slower burnup and greater conversion ratio in an upper core region so that when the reactor is in its cold shut down condition the resulting relatively increased moderation in the upper core region is accompanied by a reactivity profile that peaks in the upper core region. A fuel assembly is described comprising; a component of fissile material distributed over a substantial axial extent of the fuel assembly; and a component of neutron absorbing material having an axial distribution characterized by an enhancement in an axial zone of the fuel assembly, designated the cold shutdown control zone, corresponding to at least a portion of the axial region of the core when the cold shutdown reactivity peaks. The aggregate amount of neutron absorbing material in the cold shutdown zone of the fuel assembly is greater than the aggregate amount of neutron absorbing material in the axial zones of the fuel assembly immediately above and immediately below the cold shutdownmore » control zone whereby the cold shutdown reactivity peak is reduced relative to the cold shutdown reactivity in the zones immediately above and immediately below the cold shutdown control zone. The cold shutdown zone has an axial extent measured from the bottom of the fuel assembly in the range between 68-88 percent of the height of the fissile material in the fuel assembly.« less

Inventors:
;
Publication Date:
OSTI Identifier:
7144468
Patent Number(s):
US 4629599
Application Number:
TRN: 87-005093
Assignee:
General Electric Co., San Jose, CA NOV; NOV-87-039457; EDB-87-030587
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 18 Nov 1985
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BWR TYPE REACTORS; FUEL ELEMENT CLUSTERS; NEUTRON ABSORBERS; BURNUP; FISSILE MATERIALS; REACTIVITY; REACTOR CORES; REACTOR MATERIALS; REACTOR OPERATION; REACTOR SHUTDOWN; FISSIONABLE MATERIALS; FUEL ASSEMBLIES; MATERIALS; OPERATION; REACTOR COMPONENTS; REACTORS; SHUTDOWNS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 220400* - Nuclear Reactor Technology- Control Systems; 210100 - Power Reactors, Nonbreeding, Light-Water Moderated, Boiling Water Cooled

Citation Formats

Crowther, R.L., and Townsend, D.B. Burnable absorber arrangement for fuel bundle. United States: N. p., 1986. Web.
Crowther, R.L., & Townsend, D.B. Burnable absorber arrangement for fuel bundle. United States.
Crowther, R.L., and Townsend, D.B. Tue . "Burnable absorber arrangement for fuel bundle". United States.
@article{osti_7144468,
title = {Burnable absorber arrangement for fuel bundle},
author = {Crowther, R.L. and Townsend, D.B.},
abstractNote = {This patent describes a boiling water reactor core whose operation is characterized by a substantial proportion of steam voids with concomitantly reduced moderation toward the top of the core when the reactor is in its hot operating condition. The reduced moderation leads to slower burnup and greater conversion ratio in an upper core region so that when the reactor is in its cold shut down condition the resulting relatively increased moderation in the upper core region is accompanied by a reactivity profile that peaks in the upper core region. A fuel assembly is described comprising; a component of fissile material distributed over a substantial axial extent of the fuel assembly; and a component of neutron absorbing material having an axial distribution characterized by an enhancement in an axial zone of the fuel assembly, designated the cold shutdown control zone, corresponding to at least a portion of the axial region of the core when the cold shutdown reactivity peaks. The aggregate amount of neutron absorbing material in the cold shutdown zone of the fuel assembly is greater than the aggregate amount of neutron absorbing material in the axial zones of the fuel assembly immediately above and immediately below the cold shutdown control zone whereby the cold shutdown reactivity peak is reduced relative to the cold shutdown reactivity in the zones immediately above and immediately below the cold shutdown control zone. The cold shutdown zone has an axial extent measured from the bottom of the fuel assembly in the range between 68-88 percent of the height of the fissile material in the fuel assembly.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 16 00:00:00 EST 1986},
month = {Tue Dec 16 00:00:00 EST 1986}
}