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Method and device for improving measurement precision of axial power deviation of ex-core nuclear measurement system

An out-of-reactor nuclear measurement and axial power technology, applied in reactors, nuclear engineering, nuclear power generation, etc., can solve problems such as inconsistencies in deviations, deviations in over-temperature and over-power calculation results, and achieve the effect of improving measurement accuracy

Active Publication Date: 2015-04-29
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology

However, this approximate theoretical result corrected for a certain power deviation will inevitably make the calculation results inconsistent with the actual power deviation in the stack during the change of the axial power distribution in the stack, which will lead to deviations in the calculation results of over-temperature and over-power

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  • Method and device for improving measurement precision of axial power deviation of ex-core nuclear measurement system
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  • Method and device for improving measurement precision of axial power deviation of ex-core nuclear measurement system

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] figure 1 It is a schematic diagram of the principle of cross-effect, and the concept of cross-effect is given. The upper detector is mainly sensitive to the power in the upper part of the core, while the lower detector is mainly sensitive to the power in the lower part of the core. However, due to the existence of cross effects, the upper detector is also sensitive to the power of part of the lower core, and the lower detector is also sensitive to the power of part of the upper detector. As the power decreases, the share of the signal seen by the upper detector from the lower part of the core increases, so that the net signal drop to which the upper detector is sensitive is smaller than the actual drop in the peripheral fuel assemblies. It is conceivable that when the detector is infinitely far away from the core, the upper detector and the l...

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Abstract

The invention relates to a method and a device for improving measurement precision of axial power deviation of an ex-core nuclear measurement system. A moderated absorption material is arranged on a longitudinal middle position segment of a detector between the outer wall of a pressure container and a power range detector; fast neutrons in the upper part and the lower part of a reactor core are moderated into thermal neutrons by the moderated material before reaching a lower detector and an upper detector for ex-core nuclear measurement; and the effects on the measurement precision of the axial power deviation of the ex-core nuclear measurement system caused by the cross effects of the upper part detector and the lower part detector are reduced. After the method and the device disclosed by the invention are adopted, the cross effect is reduced from the source, so that the variance of the least squares coefficient determined under different axial power deviations is obviously reduced; and the measurement precision of the axial power deviation of the ex-core nuclear measurement system is improved.

Description

technical field [0001] The invention belongs to the design technology of an out-of-heap nuclear measurement system of a nuclear power plant, and in particular relates to a method and a device for improving the measurement accuracy of axial power deviation of the out-of-core nuclear measurement system. Background technique [0002] In the reactor protection and control system, for the PWR external power range, the two most important output signals are the total reactor power and the axial power deviation. In the protection system, the power signal is used for shutdown protection of the reactor under different operating conditions, and the power deviation signal is used as the input of the penalty function f(ΔI) in the calculation of overtemperature ΔT (OTΔT) and overpower ΔT (OPΔT). In the control system, the power signal is used for the adjustment of the average temperature and the control of the axial power deviation. [0003] Power range detectors respond to fast neutrons...

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Application Information

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IPC IPC(8): G21C17/108
CPCG21C17/108Y02E30/30
Inventor 唐楚华李勍陈杰江润张向伟
Owner CHINA NUCLEAR POWER ENG CO LTD
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