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Criticality Search of an Accelerator Driven System Using the ANET Code

World Journal of Nuclear Science and Technology 2021年第1期11卷 65-72页

作者： Xenofontos Thalia Savva Panayiota Melpomeni Varvayanni Jacques Maillard Jorge Silva nicolas catsaros Institute of Nuclear & Radiological Sciences & Technology Energy & Safety National Center for Scientific Research Demokritos Aghia Paraskevi Greece

One of the most important safety parameters taken into consideration during the design and actual operation of a nuclear reactor is its control rods adjustment to reach criticality. Concerning the conventional nuclear systems, the specification of their rods’ position through the utilization of neutronics codes, deterministic or stochastic, is considered nowadays trivial. However, innovative nuclear reactor concepts such as the Accelerator Driven Systems require sophisticated simulation capabilities of the stochastic neutronics codes since they combine high energy physics, for the spallation-produced neutrons, with classical nuclear technology. ANET (Advanced Neutronics with Evolution and Thermal hydraulic feedback) is an under development stochastic neutronics code, able to cover the broad neutron energy spectrum involved in ADS systems and therefore capable of simulating conventional and hybrid nuclear reactors and calculating important reactor parameters. In this work, ANETS’s reliability to calculate the effective multiplication factor for three core configurations containing control rods of the Kyoto University Critical Assembly, an operating ADS, is examined. The ANET results successfully compare with results produced by well-established stochastic codes such as MCNP6.1.

关键词： Monte Carlo Neutronics Analysis Code Validation Accelerator Driven Systems

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Qualification of the ANET Code for Spallation Neutron Yield and Core Criticality in the KUCA ADS

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World Journal of Nuclear Science and Technology 2019年第4期9卷 174-181页

作者： Xenofontos Thalia Panayiota Savva Melpomeni Varvayanni Jacques Maillard Jorge Silva Marc-Thierry Jaekel nicolas catsaros Institute of Nuclear and Radiological Sciences & Technology Energy & Safety National Centre for Scientific Research Demokritos Aghia Paraskevi Greece Laboratoire de Physique de l’Ecole Normale Supérieure CNRS Paris France.

Innovative nuclear reactor concepts such as the Accelerator Driven Systems (ADSs) have imposed extra requirements of simulation capabilities on the existing stochastic neutronics codes. The combination of an accelerator and a nuclear reactor in the ADS requires the simulation of both subsystems for an integrated system analysis. Therefore, a need arises for more advanced simulation tools, able to cover the broad neutron energy spectrum involved in these systems. ANET (Advanced Neutronics with Evolution and Thermal hydraulic feedback) is an under development stochastic code for simulating conventional and hybrid nuclear reactors. Successive testing applications performed throughout the ANET development have been utilized to verify and validate the new code capabilities. In this context, the ANET reliability in simulating the spallation reaction and the corresponding neutron yield as well as computing the multiplication factor of an operating ADS are here examined. More specifically, three cores of the Kyoto University Critical Assembly (KUCA) facility in Japan were analyzed focusing on the spallation neutron yield and the neutron multiplication factor. The ANET-produced results are compared with independent results obtained using the stochastic codes MCNP6.1 and MCNPX. Satisfactory agreement is found between the codes, confirming thus ANET’s capability to successfully estimate both the neutron yield of the spallation reaction and the keff of a realistic ADS.

关键词： Monte Carlo Neutronics Analysis Code Validation Accelerator Driven Systems

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