Abstract
An analysis is made of locked rotor accidents in a molten salt breeder reactor (MSBR). The evaluation is performed using a point reactor model for the reactor power and a spatially lumped parameter model of primary system for fuel temperature. In a reactor with circulating fuel such as an MSBR, the reduction or the stoppage of fuel flow caused by locked rotor of fuel pumps will result not only in adding positive reactivity due to the decrease of the loss of delayed neutron precursors out of the core, but also in loosing heat sink. In this report, locked rotor accidents of one, two, three and four pumps out of four fuel salt pumps are evaluated. It is shown that the transients of the reactor system will be within the safety range in virtue of the excellent nuclear and thermal characteristics of the MSBR.
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