Approaches to optimization of core reactivity coefficients for the «master» heat supply reactor

УДК 621.039.56

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After the power output of the MASTER heat supply reactor increased due to
insertion of an annular coolant channel, feedback coefficients deteriorated.
Thereby, it was necessary to find ways to change reactivity coefficients in the new
reactor design while at the same time retaining such features as natural circulation,
low core pressure and outlet core temperature of the coolant. Calculations were made
of the dependence of the reactivity coefficients on the annular coolant channel
width and location and on fuel enrichment. The WIMSD4 neutronphysical code was
used as a calculation tool. The results showed that the feedback coefficients
optimum can be achieved by reducing the annular channel width and increasing fuel
enrichment. At the same time the reactivity coefficients are insensitive to changing
the radius of the annular coolant channel location. Restrictions for fuel enrichment
(IAEA requirements) coupled with geometry restrictions of the annular channel
listed above (impossibility to remove thermal power or a significant increase in the
height of the heat exchanger) have shown that the possibilities of improving
feedbacks through varying the width and location of the annular channel have been
used up. Possible improvements can be achieved by changing the type of burnable
poison and the neutron spectrum.

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