Validation of new 3-D neutronics model in APROS for hexagonal geometry

Jukka Rintala

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


APROS - Advanced PROcess Simulation environment - is a widely used simulation tool for nuclear power plant modelling. Earlier the three-dimensional neutronics calculation has been based on model using the difference method. The original three-dimensional core model is mainly used in power plant simulator applications, where it fits well because of its speed. For safety analysis purposes, however, a new model was considered to be an important improvement to meet the accuracy requirements. A sophisticated nodal model used already in HEXTRAN and TRAB-3D was decided to be implemented into APROS. The hexagonal part of the model has now been implemented and tested. For practical reasons, the model was programmed from scratch into APROS and also some small improvements were added and thus, an extensive validation program was necessary to prove the correct behaviour of the model. In this paper, the most important results from AER kinetic benchmarks 2 & 3 calculations are shown as well as the calculation results against data achieved LR-0 test reactor space-time kinetic experiments. Since the model is similar to the one in HEXTRAN, the results in benchmarks are compared to the results by it. In LR-0 calculations, results by both, original and new model are presented and compared to the measurements. The results shows that the implementation of the model has been successful and the new model improves the accuracy of three-dimensional neutronics calculation in APROS into the level required in safety analyses.
Original languageEnglish
Title of host publicationConference proceeding
Subtitle of host publication20th AER Symposium on VVER Reactor Physics and Reactor Safety
PublisherAtomic Energy Research AER
ISBN (Print)978-963-372-643-3, 978-963-372-644-0
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
Event20th AER Symposium on VVER Reactor Physics and Reactor Safety - Espoo, Finland
Duration: 20 Sept 201024 Sept 2010


Conference20th AER Symposium on VVER Reactor Physics and Reactor Safety


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