A processing method and system for a nuclear power plant load linear change test

Abstract

The invention discloses a method for treating load linear change tests of a nuclear power plant. The method comprises the following steps: beginning to dilute ahead of time in a power reduction stageof the tests; when the power of the tests is reduced to be minimum, maintaining a temperature control bar to be in a low bar position, and controlling the test to be at the lowest power staying time;and in a power increasing stage of the tests, inhibiting lifting of the temperature control bar until the tests are finished. The invention further discloses a system for treating the load linear change tests of the nuclear power plant. A treatment scheme operated feasibly and quantitatively can be formulated, and human factors are reduced.

Description

technical field [0001] The invention relates to the technical field of nuclear power plants, in particular to a processing method and system for a linear change test of a nuclear power plant load. Background technique [0002] The 100% FP load linear change test is one of the most difficult tests in the commissioning and start-up stage of PWR nuclear power units. It has the characteristics of large load change range and fast change rate, and the risk of load shedding is high. The test reduced the load from 100% FP to 15% FP at a rate of 5% FP / min, waited for the main parameters of the unit to stabilize, and then increased it back to 100% FP at a rate of 5% FP / min. During the test, the reactor protection action could not be triggered. During the depowering stage of the test, the primary circuit (reactor circuit) is overheated, and the axial power deviation protection has been blocked after the load is lower than 50% FP, and the risk is low. However, in the power-up stage, du...

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Problems solved by technology

[0004] Although the above method can intervene in the overcooling of the primary circuit and the change of axial power deviation during the load linear change test, there is a certain delay in the intervention effect on the overcooling of the primary circuit and the axial power deviation. Intervention on the supercooling trend and axial power deviation trend is too dependent on the operator's skills, and it is prone to operational errors, resulting in the primary circuit overcooling load shedding or axial power deviation exceeding the load shedding logic in the operating area

Moreover, this method of intervening based on trends is not systematic, quantifiable and standardized, and cannot fundamentally solve the problem that the test process is subject to the dual constraints of primary circuit overcooling load rejection and axial power deviation exceeding the load rejection of the operating area.

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