Abstract
The Light Water Reactor (LWR) dynamics code DYN3D is extended and adopted for the application to block-type High Temperature Gas-Cooled Reactor (HTGR). A procedure for the cross section generation for the HTGR core calculations was developed. The modified Reactivity-Equivalent Physical Transformation (RPT) approach is applied in order to eliminate the double-heterogeneity of HTGR fuel elements in the deterministic lattice calculations. A full core analysis of the reference simplified HTGR core is performed with DYN3D using macroscopic nodal cross sections provided by HELIOS.
The SP3 transport approximation is integrated into the multi-group DYN3D code to take anisotropy of the neutron flux and heterogeneity of the core more precisely into account. The SP3 method was developed for hexagonal geometry of the graphite blocks, where the hexagons are subdivided into triangular nodes.
A 3D heat conduction module coupled with a channel-type coolant flow model is implemented into the code. It is shown that there is significant redistribution of the produced heat by heat conduction between the graphite blocks.
Kurzfassung
Das Leichtwasserreaktor-Dynamikprogramm DYN3D wurde für die Anwendung auf gasgekühlte Hochtemperaturreaktoren (HTGR) vom Blocktyp erweitert. Mit der modifizierten Reaktivitäts-äquivalenten Physikalischen Transformation (RPT) wurde eine Prozedur für die Generierung von effektiven Wirkungsquerschnitten für HTGR-Kerne entwickelt, die es erlaubt, die doppelte Heterogenität der HTGR-Brennelemente in den deterministischen Zellrechnungen zu eliminieren. Die Methodik wurde anhand einer DYN3D-Kernrechnung für ein vereinfachtes Referenzdesign eines HTGR erprobt, wobei die nodegemittelten Wirkungsquerschnitte mit dem Transportcode HELIOS erzeugt wurden.
In DYN3D wurde ein Transportansatz nach der SP3-Methode implementiert, der eine genauere Berechnung von Anisotropie- und Heterogenitätseffekten ermöglicht. Die SP3-Methode wurde für die hexagonale Geometrie der Grafitblöcke im HTGR-Kern abgeleitet, wobei die Hexagone in trigonale Nodes unterteilt werden.
In den Code wurde ein 3D Wärmeleitungsmodul integriert und mit dem vorhandenen Kanalmodell für die Kühlmittelströmung gekoppelt. In Testrechnungen wurde gezeigt, dass die räumliche Umverteilung der freigesetzten Wärme durch Wärmeleitung zwischen den Blöcken in radialer und axialer Richtung relevant ist.
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