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Conference Article: Impact of different libraries on the performance calculation of a modul-type pebble bed HTR.

Ohlig, U.; Brockmann, H.; Haas, K.A.; Teuchert, E. (Forschungszentrum Juelich GmbH (Germany, F.R.). Inst. fuer Sicherheitsforschung und Reaktortechnik)

Abstract

A new multigroup library for the GAM-THERMOS spectrum codes has been compiled from the sources ENDF/B-V and JEF-1. The progress in comparison to the 20 years old standard library has been studied for one specific reactor design of the Modular High Temperature Reactor. The study covers various aspects of the performance of the reactor both for the initial core and for the equilibrium cycle. For the multiplication factor keff the different amounts to DELTA keff = 0.0164 in the startup reactor, which is mainly due to changes in the cross sections of 235U. At the turn to the equilibrium cycle the difference reduces to DELTA keff = 0.0017 as due to various opposite tendencies in the data of the many involved nuclides. The change in the mass balance of the fissile materials is about 5%. The impact on the temperature coefficients is in the order of 4%, and the influence on other safety related properties of the reactor is lower than about 1 or 2 percent, confirming the confidence in formerly received results.

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key words: Gas Cooled Reactor, Nuclear Technology
Reference:
Uncertainties in physics calculations for gas cooled reactor cores. Proceedings of a specialist's meeting held in Villigen, Switzerland, 9-11 May 1990
International Atomic Energy Agency, Vienna (Austria). International Working Group on Gas-Cooled Reactors
IWGGCR--24, pp:92-98