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excess reactivity

excess reactivity

[′ek‚ses ‚rē·ak′tiv·əd·ē]
(nucleonics)
The amount of surplus reactivity over that needed to achieve criticality; it is built into a reactor (by using extra fuel) in order to compensate for fuel burnup and the accumulation of fission-product poisons during operation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
The batch refueling design necessitates a large excess reactivity at beginning of cycle; therefore two reactivity control systems were designed for the Canadian SCWR.
Analysis of Control Rod Drop Accidents for the Canadian SCWR Using Coupled 3-Dimensional Neutron Kinetics and Thermal Hydraulics
For the initial core almost without burnup, if only the fresh fuel spheres with 8.5% enrichment are loaded, the excess reactivity will be too big to control.
Physical Analysis of the Initial Core and Running-In Phase for Pebble-Bed Reactor HTR-PM
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