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Data processing method for control rod calculus worth measurement test

A data processing and control rod technology, which is applied in the fields of nuclear reactor monitoring, reactor, nuclear power generation, etc., can solve the problems of large measurement deviation and large error, and achieve the effect of improving accuracy, reducing influence and reducing error.

Active Publication Date: 2015-09-16
JIANGSU NUCLEAR POWER CORP
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AI Technical Summary

Problems solved by technology

Due to the large measurement deviation of the measured value itself, the method of linear fitting of the measured value leads to a large total error

Method used

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  • Data processing method for control rod calculus worth measurement test
  • Data processing method for control rod calculus worth measurement test
  • Data processing method for control rod calculus worth measurement test

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0025] The method includes the following steps:

[0026] Step 1. Continuously injecting clean water or boric acid solution into the core at a small flow rate;

[0027] Step 2. When the control rods of the main tuning rod group are lowered from about 85% of the core height, the reactivity change of the core before and after rod insertion is recorded by the reactivity meter. The reactivity is controlled within ±0.05βeff, and the reactivity is recorded. ,Such as figure 2 shown;

[0028] Step 3. Select the data points recorded by the reactivity instrument at t≥200s after the movement of the control rod, and use the least squares method for fitting to obtain a solid line of reactivity change. Use the same method to fit the data of the previous cycle to obtain the last cycle Reactive change solid line;

[0029] Step 4, such as figure 1 As show...

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Abstract

Belonging to the technical field of reactor startup test, the invention specifically relates to a data processing method for control rod calculus worth measurement test. The method includes the steps of: 1. conducting small flow injection of clear water or boric acid solution into a reactor core; 2. moving a control rod, and recording data points; 3. performing linear fitting of data points; 4. figuring out reactivity change; 5. working out reactivity differential worth and integral worth; 6. repeating step 2 to step 5; 7. graphing designed rod position and designed reactivity differential worth; 8. fitting the graph of step 5; and 9. comparing the measured value with a design value. The method reduces or even ignores the influence of spatial effect on the test result, reduces the error of reactivity measurement error, and improves the accuracy by about 5%. By means of unary sextic fitting, the error caused by traditional methods to measured value linear fitting is reduced, and the standard deviation is also reduced.

Description

technical field [0001] The invention belongs to the technical field of a reactor physical start-up test, in particular to a data processing method for a control rod calculus value measurement test. Background technique [0002] According to the requirements of nuclear safety regulations, the neutron physical start-up test must be performed on the core after refueling to verify the accuracy and safety of the core design, and the calculus value measurement of control rods is one of the important items. The control rods of the VVER-1000 / 428 reactor are divided into 10 groups, of which the 8th, 9th, and 10th groups are regulating rod groups, and the 10th group is the main regulating rod group. In the test, the boron adjustment method was used to measure the control rods of the 9th and 10th groups, and the rod position change ΔHi of each control rod movement cycle and the corresponding core reactivity change Δρi were obtained. The differential value of the rods was obtained by Δρ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/104
CPCG21C17/104Y02E30/30
Inventor 杨晓强李载鹏姚进国李文双王建瑜李友谊王汗董超李宝库叶刘锁孙暖
Owner JIANGSU NUCLEAR POWER CORP
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