Sodium-void reactivity measurement method for sodium-cooled fast reactor and sodium-void experimental assembly

Abstract

The invention relates to a sodium-void reactivity measurement method for a sodium-cooled fast reactor. The method comprises the following steps: (I), a measurement position is selected in a reactor core; (II) a sodium coolant for fuel components of the reactor core exists in the measurement position in the step (I) in a normal operation state, the reactor is adjusted to a tiny super-critical state, the state parameter of the reactor core, the rod positions of all control rods and counting and reactivity data of a neutron detector are recorded, and the super-critical reactivity Rho1 of a reference point is calculated in a fitting manner; (III) shutdown is performed, the sodium-void experimental assembly without the sodium coolant replaces fuel components in the step (II) when the counting drops to the background, and the super-critical reactivity Rho2 of a measurement point is obtained by adopting the method of the step (II); (IV) the measured value of the sodium-void reactivity is equal to (Rho1-Rho2); and (V) the measured value is subject to various modifications. The invention also provides a sodium-void experimental assembly used in the method. By adopting the method and the assembly which are provided by the invention, more accurate sodium-void reactivity value can be obtained.

Description

technical field [0001] The invention belongs to the technical field of reactor reactivity system calibration, and in particular relates to a method for measuring the sodium cavitation reactivity of a sodium-cooled fast reactor and a sodium cavitation experimental component. Background technique [0002] Fast neutron reactor is the main reactor type of next-generation nuclear energy system, among which sodium-cooled fast neutron power reactor (referred to as sodium-cooled fast reactor) occupies an important position in the development of next-generation nuclear energy system due to its technical maturity and excellent performance. . Sodium-cooled fast reactor uses liquid metal sodium as coolant, and its sodium cavitation reactivity effect is one of the important contents in the design process, involving fuel selection, core layout, safety system and fuel management, safety analysis, etc. The China Experimental Fast Reactor is the first sodium-cooled fast neutron power reacto...

AI Technical Summary

Problems solved by technology

In the 1960s and 1970s, foreign experimental fast reactors used special test channels to move sodium cavities, and sodium cavitation test components replaced fuel components to measure the reactivity of sodium cavitation. Due to the different structures of foreign core components, the formation of The sealing method used in the sodium cavity is different, and at the same time, due to the relatively backward measurement and control technology at that time, it caused a large error in the measurement results

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