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Reactor reactivity measuring method

A technology of reactivity measurement and reactor, applied in the direction of reactor, nuclear reactor monitoring, climate sustainability, etc., can solve the problems of lack of measurement methods, achieve fast measurement speed, high measurement accuracy, and improve the effect of measurement accuracy

Active Publication Date: 2010-08-25
蔡光明 +1
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Problems solved by technology

However, due to the lack of measurement methods to determine the external neutron source S and gamma current γ, this method generally requires that the neutron flux be near the critical level and the neutron flux be at a certain level (the general pressurized water reactor requires the mid-scale current to be at 10 -8 A or above) to ensure measurement accuracy

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Embodiment Construction

[0043] A method for measuring reactor reactivity, comprising the steps of:

[0044] Step 1. According to actual needs, give the reactor a faster reactivity perturbation to obtain a set of dynamic response neutron flux level measurement data I RPN .

[0045] Step 2. Measure the neutron flux level data I according to the point pile kinetic equation RPN Carry out inverse dynamic calculation (let S=S 0 , γ=γ 0 , n=I RPN -γ 0 ), the calculated reactivity ρ m .

[0046] Step 3, I after the reactivity is in a constant state RPN Dynamic response data, according to formula (9) to do ρ m (I RPN -γ 0 ) = f(I RPN ) fitting line, the slope of which is the reactivity ρ.

[0047] Figure 1 is the response curve of the source range detector after the subcritical lower rod is inserted. The ordinate on the left is the reactivity, and the unit is pcm (1ρcm=1×10 -5 ); the ordinate on the right is the position of the control rod, and the unit is step; the ordinate on the right also re...

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Abstract

A reactor reaction measuring method is a dynamic response reaction measuring method based on dynamic reversal. Firstly, if needed, the reactor is provided with a quick reaction disturbance so as to obtain a group of neutron flux level measuring data IRPN of dynamic response; the method carries out calculation of dynamic reversal (S=S0,gamma=gamma0,n=IRPN-gamma0) on neutron flux level measuring data IRPN according to reactor dynamics equation to obtain the response pm; and draw the fitting straight line Rhom (IRPN-gamma0)=f(IRPN) with IRPN dynamic response data, and the inclination is the response Rho. Apart from lifting the precision of reaction measurement near the critical status, the method can also make reaction measurement on reactors the secondary critical status. Furthermore, the method can obtain reaction of reactors through simple mathematic treatment, and take into consideration the impact of external neutron source and Gamma current.

Description

technical field [0001] The present invention relates to the reactivity measurement of nuclear reactor, and the reactor reactivity or effective multiplication coefficient can be obtained by using the method. Background technique [0002] The reactivity measurement of the existing nuclear reactor adopts the point reactor kinetic equation to solve the reactivity or the effective multiplication coefficient, also known as the inverse dynamic method, and the point reactor kinetic equation is as follows: [0003] dn ( t ) dt = ρ - β eff l n ( t ) + Σ i = 1 6 λ i C i ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C17/104G21C17/00
CPCG21C17/104Y02E30/30
Inventor 蔡光明盛春燕
Owner 蔡光明
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