CN-122021082-A - High-temperature alkali metal heat pipe reliability assessment method

CN122021082ACN 122021082 ACN122021082 ACN 122021082ACN-122021082-A

Abstract

The application provides a high-temperature alkali metal heat pipe reliability assessment method which comprises the steps of obtaining failure modes of a high-temperature alkali metal heat pipe, respectively calculating the failure probability of the high-temperature alkali metal heat pipe corresponding to each failure mode, constructing a structural fracture expansion model by adopting a probability fracture mechanical analysis method and calculating the failure probability of the high-temperature alkali metal heat pipe based on the structural fracture expansion model, constructing a proxy model mapped to each failure parameter by working condition variables by adopting a high-temperature alkali metal heat pipe transient working condition simulation model and calculating the failure probability of the high-temperature alkali metal heat pipe based on the proxy model in response to the failure mechanism of the failure mode as heat transfer failure, and coupling the failure probability of the high-temperature alkali metal heat pipe of each failure mode to obtain the total failure probability of the high-temperature alkali metal heat pipe.

Inventors

YANG BO
ZHANG GUOXU
WANG WEI
SHAO GE
LIU ZHAN
DU DONGXIAO
MEN QIMING
Zhang Wuhang
LI ZHAOHUA
Zang Xiaochuan

Assignees

上海核工程研究设计院股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (12)

1. The high-temperature alkali metal heat pipe reliability evaluation method is characterized by comprising the following steps of: Acquiring a failure mode of the high-temperature alkali metal heat pipe; Respectively calculating failure probability of the high-temperature alkali metal heat pipe corresponding to each failure mode, constructing a structural fracture expansion model by adopting a probability fracture mechanics analysis method in response to the failure mechanism of the failure mode as mechanical failure and calculating the failure probability of the high-temperature alkali metal heat pipe based on the structural fracture expansion model, constructing a proxy model mapped from a working condition variable to each failure parameter by adopting a high-temperature alkali metal heat pipe transient working condition simulation model in response to the failure mechanism of the failure mode as heat transfer failure and calculating the failure probability of the high-temperature alkali metal heat pipe based on the proxy model, and And coupling the failure probability of the high-temperature alkali metal heat pipe of each failure mode to obtain the total failure probability of the high-temperature alkali metal heat pipe.
2. The high temperature alkali metal heat pipe reliability assessment method according to claim 1, wherein said failure modes comprise at least one of a pipe shell rupture failure mode, a wick deformation failure mode, a working fluid degradation failure mode, and a non-condensable gas accumulation failure mode.
3. The method of evaluating the reliability of a high temperature alkali metal heat pipe as defined in claim 2, wherein said step of coupling said high temperature alkali metal heat pipe failure probability for each of said failure modes to obtain a total failure probability for said high temperature alkali metal heat pipe comprises obtaining a failure probability density function for each of said failure modes based on said high temperature alkali metal heat pipe failure probability, and obtaining a total failure probability density function for said high temperature alkali metal heat pipe by sampling said failure probability density function for each of said failure modes.
4. The method of evaluating reliability of a high temperature alkali metal heat pipe according to claim 1, wherein the step of calculating the high temperature alkali metal heat pipe failure probability based on the structural fracture expansion model comprises: acquiring the operation parameters of the high-temperature alkali metal heat pipe; randomly selecting initial crack parameters according to the probability density function to form a crack sample; Calculating crack growth conditions of the crack sample caused by at least one of fatigue, stress corrosion cracking and high-temperature creep according to the structural crack growth model, wherein the structural crack growth model comprises a fatigue crack growth sub-model, a stress corrosion crack growth sub-model and a high-temperature creep crack growth sub-model, and calculating the crack growth conditions of the crack sample comprises the steps of fitting the fatigue crack growth sub-model to obtain crack growth rates of corresponding cycle times caused by fatigue, fitting the stress corrosion crack growth sub-model to obtain crack growth rates of corresponding time caused by stress corrosion cracking, fitting the high-temperature creep crack growth sub-model to obtain creep fracture time caused by high-temperature creep; According to the crack expansion rate of the corresponding cycle times and the crack expansion rate of the corresponding time, respectively calculating to obtain the crack expansion depth of the crack sample at the simulation time point; counting the number of failed samples based on whether the crack propagation depth is greater than a high temperature alkali metal heat pipe wall thickness or whether the creep rupture time is less than the simulated time point, and And calculating the failure probability of the high-temperature alkali metal heat pipe based on the number of the failure samples.
5. The method of evaluating reliability of a high temperature alkali metal heat pipe of claim 1, wherein the step of constructing a proxy model mapped from operating variables to each failure parameter using a high temperature alkali metal heat pipe transient operating simulation model comprises: Randomly sampling the working condition variables to obtain sampling data corresponding to each failure parameter; Calculating a failure parameter simulation calculated value under a working condition corresponding to the sampling data by adopting a high-temperature alkali metal heat pipe transient working condition simulation model; Fitting the proxy model corresponding to each of the failure parameters based on the sampled data and the failure parameter simulation calculations.
6. The high temperature alkali metal heat pipe reliability assessment method of claim 1 wherein said failure parameters comprise at least one of pipe strength failure parameters, capillary limit failure parameters, and entrainment limit failure parameters.
7. The method of evaluating reliability of a high temperature alkali metal heat pipe of claim 1, wherein the operating condition variables comprise at least one of power, operating angle, purity of working medium, deformation of wick, non-condensable gas content, and run time.
8. The high temperature alkali metal heat pipe reliability assessment method of claim 1 wherein said proxy model comprises a polynomial function mapped to said failure parameter by said operating condition variable, said polynomial function being: In the formula, The failure parameters; Constant items; The number of the working condition variables; A one-dimensional vector formed by the working condition variables; A one-dimensional vector formed by the second-order expansion of the working condition variables; A one-dimensional vector formed by the three-order expansion of the working condition variables; A one-dimensional vector formed by N-order expansion of the working condition variables; 、、、、 Coefficient vectors.
9. The high temperature alkali metal heat pipe reliability evaluation method of claim 1 wherein the step of calculating the high temperature alkali metal heat pipe failure probability based on the proxy model comprises: Sampling each agent model corresponding to each failure parameter to obtain a frequency distribution histogram; obtaining a corresponding first probability density distribution function based on the frequency distribution histogram; Calculating the overlapping area of a probability density curve corresponding to the first probability density distribution function and a probability density curve corresponding to a second probability density distribution function, wherein the overlapping area is used as the failure probability corresponding to each failure parameter, and the second probability density distribution function corresponds to a reference working condition; And summing the failure probability corresponding to the failure parameter to obtain the failure probability of the high-temperature alkali metal heat pipe.
10. An electronic device, comprising: a memory for storing instructions executable by the processor, and A processor for executing the instructions to implement the method of any one of claims 1-9.
11. A computer storage medium storing computer program code which, when executed by a processor, implements the method of any of claims 1-9.
12. A computer program product comprising computer program code which, when executed by one or more processors, implements the steps in the method of any of claims 1-9.

Description

High-temperature alkali metal heat pipe reliability assessment method Technical Field The application mainly relates to the technical field of reactors, in particular to a reliability evaluation method for a high-temperature alkali metal heat pipe. Background The high-temperature alkali metal heat pipe is used as a core element for heat transmission of the high-temperature alkali metal heat pipe cooling reactor, and can efficiently transfer reactor core cracking heat to the energy conversion system. In order to ensure safe operation of the reactor, the high temperature alkali metal heat pipe needs to have an extreme environment resistance (high temperature 1000K-1800K, radiation exposure) and long-term operation (for example, operation life of more than 10 years) reliability, so as to ensure that the high temperature alkali metal heat pipe can reliably transfer heat generated by the reactor core under normal operation conditions and accident conditions. Therefore, the establishment of the reliability evaluation method of the high-temperature alkali metal heat pipe is a key premise of the high-temperature alkali metal heat pipe cooling reactor from the scheme design to the engineering verification. However, the preparation process of the high-temperature alkali metal heat pipe is complex, the processing difficulty is high, the test conditions of the high-temperature alkali metal heat pipe performance test such as heat transfer limit, starting, transient state and long-term service life test are strict, the reliability evaluation method of the high-temperature alkali metal heat pipe based on the test has the problems of high cost and long time consumption, and a scientific evaluation method is not formed at present. And the high-temperature alkali metal heat pipe which is lack of long-time high-temperature alkali metal operation data, in particular to a high-temperature alkali metal heat pipe with large length-diameter ratio, no gravity assistance and high power density, belongs to newly developed equipment, and lacks related experience in the industry. This makes it difficult for existing methods to perform an effective quantitative assessment of high temperature alkali metal heat pipe reliability. Accordingly, there is a need in the art for a method for evaluating the reliability of a high temperature alkali metal heat pipe to quantitatively evaluate the reliability of the high temperature alkali metal heat pipe. Disclosure of Invention The application aims to provide a reliability evaluation method for a high-temperature alkali metal heat pipe, which can quantitatively calculate the failure probability of the high-temperature alkali metal heat pipe, so as to scientifically evaluate the reliability of the high-temperature alkali metal heat pipe. In order to solve the technical problems, the application provides a reliability assessment method of a high-temperature alkali metal heat pipe, which comprises the steps of obtaining failure modes of the high-temperature alkali metal heat pipe, respectively calculating the failure probability of the high-temperature alkali metal heat pipe corresponding to each failure mode, constructing a structural fracture expansion model by adopting a probability fracture mechanical analysis method in response to the failure mechanism of the failure mode as mechanical failure, calculating the failure probability of the high-temperature alkali metal heat pipe based on the structural fracture expansion model, constructing a proxy model which is mapped to each failure parameter by a working condition variable by adopting a high-temperature alkali metal heat pipe transient working condition simulation model in response to the failure mechanism of the failure mode as heat transfer failure, and calculating the failure probability of the high-temperature alkali metal heat pipe based on the proxy model, and coupling the failure probability of the high-temperature alkali metal heat pipe of each failure mode to obtain the total failure probability of the high-temperature alkali metal heat pipe. In one embodiment of the present application, the failure mode includes at least one of a shell-and-tube failure mode, a wick deformation failure mode, a working fluid degradation failure mode, and a non-condensable gas accumulation failure mode. In an embodiment of the present application, the step of coupling the failure probability of the high temperature alkali metal heat pipe of each failure mode to obtain a total failure probability of the high temperature alkali metal heat pipe includes obtaining a failure probability density function of each failure mode according to the failure probability of the high temperature alkali metal heat pipe, and obtaining a total failure probability density function of the high temperature alkali metal heat pipe by sampling and coupling the failure probability density function of each failure mode. In one embodiment of the application, the step of calculating t