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Axial temperatures and fuel management models for a HTR system

Abstract

In the HTR system, there is a large difference in temperature between different parts of the reactor core. The softer neutron spectrum in the upper colder core regions tends to shift the power productions in the fresh fuel upwards. As uranium 235 depletes and plutonium with its higher cross sections in the lower hot regions is built-up, an axial power flattening takes place. These effects have been studied in detail for a single column in an equilibrium environment. The aim of this paper is to relate these findings to a whole reactor core and to investigate the influence of axial temperatures on the overall performance and in particular, the fuel management scheme chosen for the reference design. A further objective has been to calculate the reactivity requirements for different part load conditions and for various daily and weekly load diagrams. As the xenon cross section changes significantly with temperature these investigations are performed for an equilibrium core with due representation of axial temperature zones.
Authors:
Publication Date:
Nov 12, 1971
Product Type:
Technical Report
Report Number:
DCPM-13/Dragon-4; DPPN/190
Resource Relation:
Conference: 13. Dragon Countries Physics Meeting, Paris (France), Nov 1971; Other Information: Portions of the full text have limited legibility
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; DRAGON REACTOR; HTGR TYPE REACTORS; EXPERIMENTAL REACTORS
Sponsoring Organizations:
OECD Dragon Project, Paris (France)
OSTI ID:
21147215
Research Organizations:
OECD Dragon Project, Paris (France)
Country of Origin:
NEA
Language:
English
Other Identifying Numbers:
TRN: XN71OS039
Availability:
Commercial reproduction prohibited; OSTI as DE21147215
Submitting Site:
OSTI
Size:
13 pages
Announcement Date:
Apr 11, 2009

Citation Formats

Hansen, U. Axial temperatures and fuel management models for a HTR system. NEA: N. p., 1971. Web.
Hansen, U. Axial temperatures and fuel management models for a HTR system. NEA.
Hansen, U. 1971. "Axial temperatures and fuel management models for a HTR system." NEA.
@misc{etde_21147215,
title = {Axial temperatures and fuel management models for a HTR system}
author = {Hansen, U}
abstractNote = {In the HTR system, there is a large difference in temperature between different parts of the reactor core. The softer neutron spectrum in the upper colder core regions tends to shift the power productions in the fresh fuel upwards. As uranium 235 depletes and plutonium with its higher cross sections in the lower hot regions is built-up, an axial power flattening takes place. These effects have been studied in detail for a single column in an equilibrium environment. The aim of this paper is to relate these findings to a whole reactor core and to investigate the influence of axial temperatures on the overall performance and in particular, the fuel management scheme chosen for the reference design. A further objective has been to calculate the reactivity requirements for different part load conditions and for various daily and weekly load diagrams. As the xenon cross section changes significantly with temperature these investigations are performed for an equilibrium core with due representation of axial temperature zones.}
place = {NEA}
year = {1971}
month = {Nov}
}