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A method for measuring reactor power coefficient

A technology of power coefficient and measurement method, which is used in reactors, nuclear reactor monitoring, and greenhouse gas reduction, etc., to achieve stable and reliable measurement results and simple methods.

Active Publication Date: 2019-09-17
CNNC FUJIAN FUQING NUCLEAR POWER
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Problems solved by technology

However, the power is determined according to the temperature change rate of the primary circuit. If the power level is equivalent to the power level of the main pump, a large error may be introduced

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  • A method for measuring reactor power coefficient

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with specific embodiments.

[0014] The change in reactivity of the reactor after criticality can be expressed as follows:

[0015] ρ(t) = ρ(t) CB +ρ(t) POISON +ρ(t) Pr +ρ(t) ΔT +ρ(t) RCCA +ρ(t) BU (1)

[0016] In the above formula:

[0017] ρ(t) represents the reactivity of the reactor, which characterizes the deviation degree of the reactor from criticality;

[0018] ρ(t) CB represents the reactivity of boron introduction;

[0019] ρ(t) POISON Represents the reactivity introduced by poisons, including xenon poison, samarium poison, promethium poison, etc.;

[0020] ρ(t) Pr Represents the reactivity introduced by boosting power, i.e. the power deficit;

[0021] ρ(t) ΔT Represents the amount of reactivity correction that needs to be made due to the deviation of the average temperature from the reference temperature;

[0022] ρ(t) RCCA represents the reactivity introduced by the contr...

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Abstract

The invention belongs to the physical technical field of reactors of nuclear power plants, and in particular relates to a reactor power coefficient measuring method. After nuclear fission, the reactorreach stable criticality, the reactor core power is P1, the reactor core reactivity is rho1, and positive reaction is introduced to the reactor, so that the reactor power is increased continuously, the positions of starting and finishing control rods are kept unchanged during the period; negative reactive feedback is brought to the reactor core as the power increases due to a heating effect of afuel; the final reactor core reactivity is gradually reduced to 0; and the reactor core power is P2, the reactor core reactivity is rho2, and the specific value of change rho1-rho2 and powder change P1-P2 of the reactor core reactivity is calculated to obtain the power coefficient. Test measurement under a zero power platform after different reactors are critical can be conducted, and the reactorpower coefficient is obtained accurately.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant reactor physics, and in particular relates to a method for measuring the power coefficient of a reactor. Background technique [0002] During reactor power operation, as the core power level changes, the core reactivity also changes, such as power deficit, xenon poisoning, and so on. The reactivity change caused by the rise of the core power level is the power loss, mainly including the temperature effect of the core moderator, the fuel Doppler effect and the cavitation effect. During operation of the reactor power, these effects are required to always be negative reactivity effects, thus guaranteeing a negative power coefficient. That is, the core has self-stability, which makes the reactor inherently safe. Therefore, the measurement of the power coefficient is an important means to verify the core design, and also an important means to verify the nuclear design software. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C17/10
CPCG21C17/10Y02E30/30
Inventor 蔡光明胡娟耿飞程宏亚孟凡锋李振振郑东佳鲁忆迅吴敏杰
Owner CNNC FUJIAN FUQING NUCLEAR POWER
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