On-site Implementation Method of Dynamic Rod Engraving in Nuclear Power Plant

Abstract

The invention relates to a nuclear power station dynamic rod worth measurement on-site enforcement method. The method comprises the following steps: correcting spatial effect during a measurement process, determining local offset current, optimizing a sequence of rod worth measurement and a sequence of zero-power physics testing, and arranging an advanced reactivity meter and then inspecting the advanced reactivity meter. In the improved dynamic rod worth measurement on-site enforcement method, each group of control rod can independently measure without interference effect, rod worth is not dependent on worth of a reference rod, the reliability of measuring result is high; steps of boronation and dilution are not employed during the measurement process, the obtained maximum reactivity is dependent on reactivity of an original state, so that the enforcement method is safer; measuring operation is simple, man-made error probability is greatly reduced; the dynamic rod worth measurement on-site enforcement method can provide the control rod worth by taking position as function, and provides a reactor core design model required by more data verification security analysis; measurement efficiency is increased, the overhaul time of key paths can be greatly shortened by at least about a dozen hours in each overhaul; and movement of the control rod and discharge of radioactive waste can be reduced.

Description

technical field [0001] The invention relates to the technical field of digital control of nuclear power plants, in particular to related methods involved in the on-site implementation of dynamic marking of nuclear power plants, including the correction of space effects during the measurement process, the determination of local compensation currents, the order of marking sticks, and the optimization of the sequence of zero-power physical tests , and the setting and inspection of advanced reactivity instruments, etc. Background technique [0002] The control rod is an indispensable control component for the emergency control and power regulation of the nuclear reactor. Under normal working conditions, by adjusting the position of the control rod, the normal start-up and shutdown of the reactor can be realized, so that the reactor can operate at a given power level or the reactor Power regulation; under accident conditions, the emergency shutdown can be realized by quickly inse...

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Problems solved by technology

[0006] (1) Correction of space effects: In order to use the reactivity equation derived from the point reactor model, the core needs to be in an asymptotic equilibrium state

[0007] (2) Determination of the background compensation current: the determination method of the background compensation current provided by Westinghouse Corporation of the United States is not suitable for the background compensation current of different nuclear power plant units, resulting in a far difference between the measurement results and the traditional rod marking method, which directly leads to some Control Rod Measured Value Wrongly Exceeds Acceptance Criteria

[0008] (3) The optimization of the engraving sequence: the dynamic engraving technology provided by Westinghouse Corporation of the United States does not consider optimizing the engraving sequence, and does not consider the changing trend of the background compensation current and the impact on the value of the rods in combination with the characteristics of specific nuclear power plant units. , resulting in the measurement results of the dynamic rod marking technology being adversely affected by the background compensation current to a certain extent, which directly affects the results and accuracy of the dynamic rod marking technology

[0009] (4) Optimization of zero-power physical tests: The dynamic engraving technology provided by Westinghouse Corporation of the United States does not consider optimizing the sequence of zero-power physical tests, and does not consider the positive moderator temperature and background compensation current in combination with the characteristics of specific nuclear power plant units. The changing trend and influence on the test results and test time lead to the measurement results of the dynamic inscription rod technology being adversely affected by the background compensation current to a certain extent, which directly affects the accuracy and results of the zero-power physical test, and the unfavorable influence of commercial power plants. Necessary loss of economic benefits

However, traditional reactivity meters cannot meet these requirements

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