Models for reactor physics calculations for HTR pebble bed modular reactors

For reactor physics calculations for modular pebble bed reactors program systems and nuclear data have to be used to get reliable results for important operational and safety related parameters. For cylindrical or annular core geometry such parameters can be calculated with the modular program system ZIRKUS and additionally with common reactor physics programs based on S-N and Monte Carlo theory. The modules of the ZIRKUS system were developed by Framatome ANP GmbH and extensively used for design calculations for the 200 MWel HTR-MODUL and verified by means of experiments and operational data mainly from AVR. The models used in ZIRKUS will be described and discussed for typical design calculations for HTR pebble bed reactors. (C) 2003 Elsevier Science B.V All rights reserved.