Risk evaluation method for prolong test cycle of containment in nuclear power plant

Abstract

The present invention provides a risk evaluation method for prolong a test cycle of a containment in a nuclear power plant. The method comprises the following steps of: S101, obtaining a quantitativeanalysis result of an early-phase radioactivity release sequence according to a nuclear power plant first-level probability safety evaluation analysis result, and according to an accident type, employing a containment even tree to perform classification of the containment state corresponding to the final state of the early-phase radioactivity release sequence; S102, determining a population dosagereference value corresponding to each accident class; S103, determining a lot of early-phase radioactivity large dosage release frequency increment [Delta]LERF, an index population dosage increment rate [Delta]Dose, and the containment generation probability CCFP (Conditional Containment Failure Probability) and a change [Delta]CCFP thereof when the reactor core damaging accident is generated; S104, according to the [Delta]LERF, the [Delta]Dose, the CCFP and the [Delta]CCFP, analyzing a risk after the containment sealing test cycle is changed through a preset corresponding reference value; and S200, according to an analysis result obtained the steps mentioned above, outputting evaluation result.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a risk assessment method for extending the containment test cycle of a nuclear power plant. Background technique [0002] The containment vessel of a nuclear power plant needs to have good sealing performance to contain the radioactive material after an accident inside or outside the containment vessel. In order to test the sealing performance of the containment vessel, the containment test (ContainmentTest, CTT) needs to be done regularly. [0003] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the current domestic CTT period is determined according to early experience and foreign regulations, rather than determining a reasonable CTT period based on the performance of the containment vessel, and the CTT period will increase if it is too frequent Overhaul time; in addition, frequent CT...

AI Technical Summary

Problems solved by technology

[0003] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the current domestic CTT period is determined according to early experience and foreign regulations, rather than determining a reasonable CTT period based on the performance of the containment vessel, and the CTT period will increase if it is too frequent Overhaul time; in addition, frequent CTT will also have a certain impact on the structural integrity of the containment, and will increase the radiation dose of power plant personnel, which will also have a negative impact on industrial safety

There is no domestic evaluation technology that uses risk-guided decision-making methods to quantitatively evaluate risk increment after the CTT cycle is extended

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