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Irradiation deformation calculation method of zirconium-niobium pressure pipe in CANDU reactor

A zirconium-niobium pressure tube, deformation calculation technology, applied in reactor, nuclear reactor monitoring, calculation, etc.

Active Publication Date: 2016-07-27
CNNC NUCLEAR POWER OPERATION MANAGEMENT +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the basis of statistical laws, a new, practical, and reliable calculation equation for the calculation of radiation deformation of zirconium-2.5-niobium pressure tubes in CANDU reactors is established to solve the calculation problem of radiation deformation more concisely

Method used

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  • Irradiation deformation calculation method of zirconium-niobium pressure pipe in CANDU reactor
  • Irradiation deformation calculation method of zirconium-niobium pressure pipe in CANDU reactor
  • Irradiation deformation calculation method of zirconium-niobium pressure pipe in CANDU reactor

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Embodiment Construction

[0185] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0186]The present invention analyzes the in-service inspection data of the Qinshan pressure tube (including the pressure tube length data measured by the refueling machine) and the radiation test results of the zirconium 2.5 niobium pressure tube material carried out by AECL (Canadian Atomic Energy Corporation) in the past, and studies the zirconium 2.5 The relationship between the irradiation deformation of niobium pressure tube in CANDU reactor and various operating parameters and the texture and microstructure parameters of the material itself, including the relationship between transverse thermal creep and pressure tube temperature, hoop stress and operating time, axis The relationship between radiation elongation and radiation creep rate and fast neutron fluence rate in the direction and transverse direction, and their relationship with the radiatio...

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Abstract

The invention belongs to the technical field of nuclear reactor material irradiation damage and irradiation effect obtaining, and provides an irradiation deformation calculation method of a zirconium-2.5 niobium pressure pipe in a CANDU (Canada Deuterium Uranium) reactor. The irradiation deformation is calculated by using formulas shown as the accompanying drawing. Epsilon<.> <d> represents the strain rate in the d direction, including the transverse direction and the axial direction, and the unit is 10<-8>h<-1>; Epsilon<.> <thermal> <creep> represents the inner diameter average thermal creep rate of the pressure pipe, and the unit is 10<-8>h<-1>; Epsilon<.> <growth> <d> represents the d direction irradiation elongation rate of the pressure pipe, and the unit is 10<-8>h<-1>; Epsilon<.> <creep> <d> represents the d direction irradiation creep rate of the pressure pipe, and the unit is 10<-8>h<-1>; a built irradiation deformation equation of the zirconium-2.5 niobium pressure pipe in the CANDU reactor can be directly applied to the calculation of irradiation deformation; the equation is used for calculating the axial and radial irradiation deformation of Qinshan pressure pipes; obtained data is compared with in-service inspection data; and relative errors are all in normal distribution (the normal distribution is shown as the accompanying drawing in the abstract: frequency distribution of relative errors of axial irradiation strain speed measured values and calculation values of 760 Qinshan pressure pipes).

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor material radiation damage and radiation effect acquisition. Background technique [0002] Zirconium 2.5 niobium pressure tube is a key component of CANDU heavy water reactor core, zirconium 2.5 niobium alloy is an anisotropic material, zirconium 2.5 niobium pressure tube will produce anisotropic dimensional deformation under fast neutron irradiation (including irradiation elongation, radiation creep and thermal creep), macroscopically, the diameter must expand, the length must be elongated, and the wall thickness must be thinned. At the same time, zirconium alloys need to absorb hydrogen during use, and when the hydrogen concentration exceeds the limit solid solubility, zirconium hydride will be precipitated, which is a brittle substance that will gradually embrittle the pressure tube. These are the two main factors affecting the service life of zirconium 2.5 niobium pressure tubes. Ther...

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Application Information

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IPC IPC(8): G06F19/00
CPCG21C17/00Y02E30/30
Inventor 唐炯然
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT
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