Reactivity instrument for critical monitoring and critical extrapolation of reactor

Abstract

The invention belongs to a measurement device of a nuclear reactor and in particular relates to a device for measuring the reactivity of a nuclear reactor and monitoring the critical state of the nuclear reactor. The device is composed of a data processor and a signal conditioner; an isolation amplifier is arranged in the signal conditioner; and the input end of the isolation amplifier is provided with a P2 signal input port. The device not only has the function of measuring the reactivity but also has the critical monitoring and critical extrapolation functions, and can automatically measure the reactivity of the reactor and perform the offline processing on the measurement result; and when the critical extrapolation and the critical monitoring are conducted, the selection of extrapolation sub-function items and the selection of extrapolation data intervals can be carried out via a human-machine interface, diversified display and record can be carried out on the result. The reactivity instrument has the advantages of high automation degree, rapid measurement speed, high measurement accuracy and simplicity and convenience in operation, thereby greatly improving the functionality and use ratio of the device and achieving the full coverage of the full-function application field before the nuclear reactor is in a critical state.

Description

technical field [0001] The invention belongs to a nuclear reactor measuring device, in particular to a device for measuring the reactivity of the nuclear reactor and supervising the critical state of the nuclear reactor. Background technique [0002] The critical point of the reactor is a very important parameter related to the safety of the reactor. It is essential to know the critical point in advance for the operation of the reactor. The criticality supervision of the reactor plays an important role in judging whether the reactor is in a safe state during the loading and unloading period and the initial critical stage. very important role. [0003] At present, the critical extrapolation of the reactor and the critical supervision during the loading and unloading process are basically realized by collecting relevant parameters through special equipment and relying entirely on manual extrapolation and calculation by the operator. Its disadvantages are: due to the complex e...

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Problems solved by technology

Its disadvantages are: due to the complex extrapolation calculation, the manual method takes a long time and is extremely error-prone; the neutron fluence rate signal of the traditional reactivity meter comes from the current signal in the power zone or the middle zone, due to the limitation of the detector sensitivity, In the critical extrapolation stage, the output current of the detector is about 10-10A-10-9A, such a weak signal is easily disturbed by the outside world, and the measurement accuracy is difficult to guarantee; Using the neutron fluence rate data obtained when measuring the reactivity with a traditional reactivity meter for critical extrapolation, it is difficult to optimize the selection of data segments

For example, "Subcriticality Measurement of Pressurized Water Reactors during Criticality Approach using a Digital Reactivity Meter" in "Journal of NUCLEAR SCIENCE and TECHNOLOGY" Vol. 42, No. 2, p. 145–152 (February 2005), proposed that the reactor control rod A method of calculating the critical moment by using the change trend of reactivity during adjustment and a correction method of related parameters are given, and the feasibility of using a reactivity meter to measure subcriticality on a PWR is given, but this paper is only theoretical A possibility is given above, but there is no relevant report on the real use of reactivity meter for subcritical degree measurement

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