Published November 1, 1991 | Version v1
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Nuclear Calculations for the Repair Concept 'Block Exchange DIDO'

Creators

  • 1. Forschungszentrum Jülich GmbH, Jülich, Germany

Description

[Automatically extracted and translated] Neutron physics calculations have been performed for the planned reconstruction of the Jülich research reactor FRJ-2 (DIDO). The exchange of the graphite reflector by heavy water along with an enlargement of the reactor vessel has been investigated with respect to the system's reactivity and the global neutron flux. Changing some of the now radially arranged neutron guide tubes to a tangential configuration has been looked at, too. The analysis shows that the reflector exchange has only marginal effect on reactivity and neutron flux distribution. The tangential guide tubes seem to increase the neutron current somewhat including a steep decrease of fast neutrons (>0.1 MeV) to about one third of the old value.

Abstract (German)

[Automatisch extrahiert und übersetzt] Für den geplanten Umbau des Jülicher Forschungsreaktors FRJ-2 (DIDO) wurden neutronenphysikalische Berechnungen durchgeführt. Insbesondere wurde untersucht, welche Auswirkungen der Austausch des Graphitreflektors durch Schwerwasser bei gleichzeitiger Vergrößerung des Reaktortanks auf die Reaktivität des Systems hat und wie der Übergang von jetzt radialen zu tangential angeordneten Strahlrohren die für Experimente nutzbaren Neutronen beeinflusst. Die Berechnungen zeigen, dass der Austausch des Reflektors die Systemreaktivität und den globalen Neutronenfluss nur marginal verändert. Die Ausbeute an thermischen Neutronen scheint durch die tangentialen Strahlrohre geringfügig erhöht zu werden, zusätzlich wird der störende Pegel schneller Neutronen (E>0.1 MeV) auf ca. ein Drittel des jetzigen Wertes verringert.

Files

ISR_IB_1991-18_Kalker-Rechnungen zum Reparaturkonzept Blockaustausch DIDO.pdf

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Additional details

Additional titles

Original title (German)
Nukleare Berechnungen zum Reparaturkonzept 'Blockaustausch DIDO'

Publishing Information

Report number
KFA-ISR-IB-18/1991

INIS

Country of Publication
Germany
Country of Input or Organization
International Atomic Energy Agency (IAEA)
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; S22: GENERAL STUDIES OF NUCLEAR REACTORS;
Descriptors DEI
CONTROL ELEMENTS; FAST NEUTRONS; FEDERAL REPUBLIC OF GERMANY; FRJ-2 REACTOR; GUIDE TUBES; HEAVY WATER; HTGR TYPE REACTORS; NEUTRON FLUX; NEUTRON GUIDES; NEUTRON PHYSICS; NEUTRON REFLECTORS; REACTIVITY; REACTIVITY METERS; REACTOR KINETICS; REACTOR PHYSICS; REACTOR VESSELS
Descriptors DEC
BARYONS; CONTAINERS; DEUTERIUM COMPOUNDS; DEVELOPED COUNTRIES; ELEMENTARY PARTICLES; ENRICHED URANIUM REACTORS; EUROPE; FERMIONS; GAS COOLED REACTORS; GRAPHITE MODERATED REACTORS; HADRONS; HEAVY WATER COOLED REACTORS; HEAVY WATER MODERATED REACTORS; HYDROGEN COMPOUNDS; IRRADIATION REACTORS; ISOTOPE PRODUCTION REACTORS; KINETICS; MATERIALS TESTING REACTORS; MEASURING INSTRUMENTS; METERS; NEUTRONS; NUCLEONS; OXYGEN COMPOUNDS; PHYSICS; RADIATION FLUX; REACTOR COMPONENTS; REACTORS; RESEARCH AND TEST REACTORS; RESEARCH REACTORS; TANK TYPE REACTORS; TUBES; WATER; WESTERN EUROPE
Proposed descriptors and Free-text terms
FEDERAL REPUBLIC OF GERMANY; FORSCHUNGSZENTRUM JUELICH; HTGR TYPE REACTORS;

Optional Information

Notes
Document from Juelich Preservation Project