Affiliation:
1. Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia. E-mail: and
Abstract
Abstract
The effect of TRISO particles' size variations and inter-particle distance on infinite multiplication factor (kinf) of a pebble bed reactor (PBR) is studied using MCNP code. It is observed that kinf decreases with increasing TRISO particles' size, mainly due to increased total particle surface leading to stronger resonance absorption. Negative temperature reactivity effect is observed at all particle sizes. The kinf increases strongly when particles form in clusters as the clusters behave as a single bigger particle. It is also observed that the white boundary condition is not an appropriate approximation of the unit-cell flux boundary condition in the calculations as it yields significantly higher values of kinf than periodic and reflective boundary conditions.
Subject
Safety, Risk, Reliability and Quality,General Materials Science,Nuclear Energy and Engineering,Nuclear and High Energy Physics,Radiation
Cited by
4 articles.
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2. On random sampling of correlated resonance parameters with large uncertainties;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment;2013-09
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