Study on kinetic parameters characteristics of pebble bed reactor using HTR-proteus facility
The inherent safety feature of a pebble-bed reactor can be observed from its kinetic parameters. Proper modeling for calculating the reactor kinetic is also a concern for safe operation during normal and transient conditions. This study is intended to investigate the kinetic parameters c...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
VINCA Institute of Nuclear Sciences
2022-01-01
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| Series: | Nuclear Technology and Radiation Protection |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1451-3994/2022/1451-39942202119Z.pdf |
| Summary: | The inherent safety feature of a pebble-bed reactor can be observed from its
kinetic parameters. Proper modeling for calculating the reactor kinetic is
also a concern for safe operation during normal and transient conditions.
This study is intended to investigate the kinetic parameters
characteristics of a pebble bed reactor using HTR-Proteus. A series of
calculations were conducted using MCNP6 code and ENDF/B-VII library. The
calculation results show that the negative value on core temperature
reactivity is affected dominantly by the Doppler broadening effect. Prompt
neutron lifetime l and mean generation time Λ are slightly changed due to an
increase in fuel temperature, moderator, and reflector that changed the
neutron moderation and absorption over this part of the reactor. For (Th,
U)O2, UO2, and PuO2 cores, the effective delayed neutron fraction
βeff values are more influenced by 233U, 235U, and 239Pu, respectively. In
terms of stability during reactivity insertion, the UO 2 core is more stable
and easier to control because its βeff value is the largest compared to (Th,U)O2
and PuO 2 cores. It can be concluded that temperature must
be controlled because it does not only affect the reactivity but also
kinetic parameters as part of developing inherent safety features on the
pebble-bed reactor. |
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| ISSN: | 1451-3994 1452-8185 |