Validating the Serpent-Ants Calculation Chain Using BEAVRS Fresh Core HZP Data

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


The Serpent Monte Carlo code and the Serpent-Ants two step calculation chain are used to model the hot zero power physics tests described in the BEAVRS benchmark. The predicted critical boron concentrations, control rod group worths and isothermal temperature coefficients are compared between Serpent and Serpent-Ants as well as against the experimental measurements. Furthermore, radial power distributions in the unrodded core are compared between Serpent and Serpent-Ants. In addition to providing results using a “best estimate” calculation chain, the effects of several simplifications or omissions in the group constant generation process on the results are estimated. The “best estimate” predictions by Serpent-Ants are reasonably close to the experimental values with RMS differences from measurements of 29.7 ppm, 62.2 pcm and 0.37 pcm/°F for boron, control rod worths and temperature coefficients respectively. The match in the radial power distribution between Serpent and Serpent-Ants was very good with the RMS and maximum for pin power errors being 1.31 % and 5.01 % respectively. While the tested sub-optimal variations in the two-step calculation chain led to a clear worsening of the radial power distribution, the effects in the global parameters were more mixed with some sub-optimal approaches actually providing better results for critical boron and control rod worths than the “best estimate” approach.
Original languageEnglish
Title of host publicationNENE 2020 Conference Proceedings
EditorsLuka Snoj, Aljaž Čufar
Place of PublicationLjubljana
Number of pages8
ISBN (Electronic)978-961-6207-49-2
Publication statusPublished - 2020
MoE publication typeA4 Article in a conference publication
Event29th International Conference Nuclear Energy for New Europe, NENE 2020: Connecting Science and Industry - Hybrid Conference, Portoroz, Slovakia
Duration: 7 Sept 202010 Sept 2020


Conference29th International Conference Nuclear Energy for New Europe, NENE 2020
Abbreviated titleNENE 2020


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