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Method for monitoring sub-critical reactor reactivity

A reactor and reactivity technology, applied in reactors, nuclear reactor monitoring, climate sustainability, etc., can solve problems that have not yet been precedented in the engineering application of ADS transmutation systems, and achieve the effect of avoiding space effect correction

Active Publication Date: 2019-06-18
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

[0003] At present, there is no precedent for engineering application of ADS transmutation system in the world

Method used

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  • Method for monitoring sub-critical reactor reactivity
  • Method for monitoring sub-critical reactor reactivity
  • Method for monitoring sub-critical reactor reactivity

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] For a subcritical reactor driven by an external source, the problem of solving the neutron flux density distribution is the definite solution of the inhomogeneous equation expressed by the matrix of the neutron transport equation, namely:

[0017] AΦ 1 = MΦ 1 +S (where, S is an independent external neutron source) (1)

[0018] In the formula, A is the input operator (including leakage, scattering and absorption), M is the multiplication operator, Φ 1 is the neutron flux density (or power) when the source is active, and S is the independent external neutron source.

[0019] Under the simple group approximation, the spatial distribution of the neutron flux density in the reactor is:

[0020]

[0021] Among them, k n is the nth order eigenvalue of the system, k 1 is the maximum eigenvalue of the system, that is, the effective multiplicati...

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Abstract

The invention relates to a method for monitoring sub-critical reactor reactivity. The method includes the steps: placing neutron detectors at two different positions of a reactor; effective multiplication constant gradually changing the reactor reactivity, and recording a specific value C and an effective multiplication constant keff of neutron counting rate at the same moment; fitting calibratingcurve graphs of the specific values C and the effective multiplication constants keff of the neutron counting rate of various moments; recording neutron counting rates of the two neutron detectors inreal time to obtain specific values of the two neutron counting rates, and substituting the specific values into the calibrating curve graphs to obtain effective multiplication constants of the effective multiplication constant when reactor reactivity is practically monitored. The neutron detectors are used for acquiring neutron counting rates, and the specific values C of the neutron counting rates recorded by two detectors represent characteristic parameters of neutron flux density space distribution shapes. Compared with a traditional method, the method is more visual, simple and convenient, on-line real-time monitoring of the reactivity change can be achieved, effects of external source intensity are omitted, and space effect correction of the traditional method under a deep sub-critical condition is avoided.

Description

technical field [0001] The invention belongs to the reactivity monitoring technology of nuclear reactors, in particular to a method for monitoring the reactivity of subcritical reactors. Background technique [0002] The accelerator-driven subcritical system (ADS transmutation system) is to use the high-energy ions generated by the accelerator to bombard the spallation target to produce high-flux, high-energy neutrons, and use the generated neutrons as a neutron source to drive the subcritical reactor system. A critical reactor operates at a certain high power level driven by a spallation neutron source. And the critical device (i.e. zero power reactor) is at neutron effective multiplication factor k eff =1, there is no need for supervision, and only need to release its reserve reactivity to make up for the reactivity reduction caused by fuel burnup during operation. In the design of critical devices, a large backup reactivity is required. For example, for large pressurize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/104G21C17/108
CPCY02E30/30
Inventor 刘洋罗皇达朱庆福周琦梁淑红王藩
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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