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The inherent safety is satisfied by the negative void reactivity effects and sufficient shutdown margin.
(c) Reducing the negative void coefficient of reactivity by, at least, 50%.
New core arrangement for negative void reactivity is proposed by three-dimensional tri-z core calculation fully coupled with thermal hydraulic calculation, where ZrH layer concept is used for negative void reactivity.
With its small reactor core size, large negative void coefficient, and low operating thermal neutron flux, an enhanced xenon stability characteristic is possible.
Also, the stability of the reactor is found to increase with increase in negative void reactivity coefficient unlike that observed previously in vessel type BWRs.
Negative void reactivity is inserted even if whole of the core and upper plenum are voided hypothetically by steam intrusion from above.
Similar(39)
Through a sensitivity study of fuel enrichment, type of burnable absorber, and moderator to fuel volume ratio, a design strategy for the CANDU reactor was suggested in order to achieve a negative coolant void reactivity even for the checkerboard voiding case.
Previous conceptual design has negative overall void reactivity.
Dysprosium has been used as a slow neutron absorber in the fuel assembly of Advanced Heavy Water Reactor AHWRR) to achieve a negative coolant void reactivity.
Supercritical-pressure light water cooled fast reactor adopts the blanket fuel assemblies with depleted uranium fuel and zirconium hydride layer in the core for negative coolant void reactivity.
With exclusive refueling and shuffling scheme as well as partial length control rod design, neutronics & TH coupled calculation shows satisfactory results that can fulfil the requirement of design for both 500 °C outlet temperature and negative coolant void reactivity.
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