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A data processing method for measuring prompt neutron decay parameters in reactors

A technology of prompt neutron and attenuation parameters, which is applied in the field of measurement of dynamic characteristic parameters of zero-power reactor physical tests, to achieve the effects of ensuring safety, avoiding prompt critical accidents, and reliable prompt neutron attenuation parameters

Active Publication Date: 2017-12-15
NUCLEAR POWER INSTITUTE OF CHINA
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to obtain effective and reliable prompt neutron attenuation parameters. The problem

Method used

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  • A data processing method for measuring prompt neutron decay parameters in reactors
  • A data processing method for measuring prompt neutron decay parameters in reactors
  • A data processing method for measuring prompt neutron decay parameters in reactors

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Embodiment

[0041] Such as Figure 1 to Figure 2 Shown, a kind of reactor of the present invention measures the data processing method of prompt neutron attenuation parameter, comprises the following steps,

[0042] Step 1: Determine the prompt neutron attenuation parameter α to participate in the fitting i The data point n;

[0043] Step 2: Determine the control rod used for the calibration. The scale is represented by H, and the unit is cm. According to the rod lifting procedure, lift the control rod to the top, and keep the peripheral control rods fixed after leveling, and then divide the control rods into n steps. Insert evenly to the bottom, insert one H each time i The stick position measures a corresponding α i Value, n is a natural number greater than zero;

[0044] Step 3: Whenever the control stick is inserted down to H i When the rod is in position, according to the estimated α i The value adjusts the emission frequency of pulsed neutrons, so that within a pulse period, t...

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Abstract

The invention discloses a data processing method for measuring prompt neutron attenuation parameters of a reactor, including the reactivity measurement principle of the α method: ρ=(α‑α0) / α0, wherein α and α0 are prompt neutron attenuation parameters, The unit is s-1; ρ is the reactivity, and the unit is βeff; it also includes the following steps, step 1: determine the data point n of the prompt neutron attenuation parameter αi participating in the fitting; step 2: determine the control used for the scale The rod, the scale is represented by H, the unit is cm. According to the rod lifting procedure, lift the control rod to the top, adjust the peripheral control rods to the critical level and keep it still, and then insert the control rods evenly in n steps to the bottom, inserting a Hi each time A corresponding αi value is measured at the rod position, and n is a natural number greater than zero; Step 3: Whenever the control rod is lowered to the Hi rod position, adjust the emission frequency of pulse neutrons according to the estimated value of αi, so that in a pulse During the period, the prompt neutrons just decay completely and the delayed neutrons tend to the background, and a value of αi is obtained by fitting the measurement curve according to the least square method.

Description

technical field [0001] The invention relates to the technical field of measuring dynamic characteristic parameters of a zero-power reactor physical test, in particular to a data processing method for measuring prompt neutron attenuation parameters of a reactor. Background technique [0002] In the research of zero-power physics experiments with uranium water as the medium, the reactor usually operates in the delayed criticality state, and the prompt neutrons play a leading role in the attenuation of the secondary neutrons. Prompt neutron decay is represented by the characteristic time parameter α, which is a characterization of the probability of prompt neutron decay per unit time. The deeper the subcriticality is, the larger the value of α is. For a specific reactor type, the Prompt neutron decay parameter α 0 is unique. Delayed critical prompt neutron attenuation parameter α 0 As a reference point, the prompt neutron attenuation parameter α in different subcritical stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C17/104
CPCG21C17/104Y02E30/30
Inventor 盘世标黄礼渊牛江付国恩杨永木阳林锋汪文聪
Owner NUCLEAR POWER INSTITUTE OF CHINA
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