Stress–Strain State of Nuclear Reactor Core Baffle Under the Action of Thermal and Irradiation Fields

Breslavsky, Dmytro; Senko, Alyona; Tatarinova, Oksana; Voevodin, V. М.; Kalchenko, А.S.

doi:10.1007/978-3-030-75890-5_16

Cited by 3 publications

(9 citation statements)

References 12 publications

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“…As can be seen from the distributions shown in Figs. 8 and 9, the maximum values of strains and damage parameter are at the inner radius, which corresponds to known solutions (see, for example, [25]). At the same time, there are fluctuations around the hole.…”

Section: Fig 7 Distribution Of Von Mises Equivalent Stresses Through ...mentioning

confidence: 80%

“…Function S [25,26] depends upon accumulated dose D a , time t, temperature and experimentally determined parameters.…”

Section: Problem Statementmentioning

confidence: 99%

“…Let us integrate the equation (24). We obtain: (25) In the moment of the finishing the hidden damage accumulation . Set t=t * , = * we have: (26) From Eq.…”

Section: Fig 1 Stress-strain Diagram For Specimens Made From Two Mate...mentioning

confidence: 99%

“…In this software the numerical simulation under a two-dimensional stress state is performed using the FEM and differential time integration methods. The main components of the method with the features of its application to elements of nuclear reactors are described in [25,26]. In this paper, additionally developed software modules were used for the implementation of the evolution equation and for determining the sets of finite elements that are situated near the surface of the structural element in order to assign them additional properties of accumulation the hidden damage levels due to hydrogen embrittlement.…”

Section: Analysis Of Numerical Datamentioning

confidence: 99%

“…Let us consider a long rod in which a 1D stress state is realized. The tensile stress is 460 MPa, this value is the maximum possible at the thermal-force loading of the reactor baffle of the WWER-1000 type [25]. The rod is heated to a temperature of 710 K. It is in the conditions of radiation exposure described above.…”

Section: Analysis Of Numerical Datamentioning

confidence: 99%

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Numerical Modeling of Hidden Damage Accumulation Due to Radiation Exposure and Hydrogen Embrittlement

Breslavsky,

Tatarinova,

Tolstolutska

et al. 2024

Problems of Atomic Science and Technology

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An approach that allows using the qualitative results of the analysis of the so-called "mechanism based" evolution equations, i.e. constructed using experiments at the micro- and meso-level, to determine the structure of the equation for another, similar in composition, material, is proposed. To determine damage due to irradiation influence, the classical method of Continuum Damage Mechanics was used. The proposed approach of qualitative reproduction of the effects of damage accumulation was used due to the lack of experimental data on the long-term behavior of the material under consideration (steel 08X18N9T) under the given conditions of temperature and radiation exposure. The previously studied influence of the effects of various processes on the hidden damage accumulation was used to reproduce it in the proposed equation. The influence of the type of stress state due to the invariants of the stress tensor and deviator is taken into account. The effect of hydrogen embrittlement is reflected using known data from experiments performed at the macro level, taking into account changes in the modulus of elasticity. The resulting function entered the evolution equation in an exponential form. The developed evolution equation for the damage parameter is added to the previously proven method and software for modeling structural elements exposed to thermal, force and irradiation fields. Examples of the analysis of problems of deformation, damage and fracture of specimens and a tube with a hole, in which the behavior of the corresponding zones of the reactor baffle is simulated, are provided. The performed numerical calculations showed the possibility of practical assessment of the deformed state and the level of acquired hidden damage.

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Section: Fig 7 Distribution Of Von Mises Equivalent Stresses Through ...mentioning

confidence: 80%

“…Function S [25,26] depends upon accumulated dose D a , time t, temperature and experimentally determined parameters.…”

Section: Problem Statementmentioning

confidence: 99%

“…Let us integrate the equation (24). We obtain: (25) In the moment of the finishing the hidden damage accumulation . Set t=t * , = * we have: (26) From Eq.…”

Section: Fig 1 Stress-strain Diagram For Specimens Made From Two Mate...mentioning

confidence: 99%

Section: Analysis Of Numerical Datamentioning

confidence: 99%

Section: Analysis Of Numerical Datamentioning

confidence: 99%

See 3 more Smart Citations

Numerical Modeling of Hidden Damage Accumulation Due to Radiation Exposure and Hydrogen Embrittlement

Breslavsky,

Tatarinova,

Tolstolutska

et al. 2024

Problems of Atomic Science and Technology

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Creep and Irradiation Effects in Reactor Vessel Internals

Breslavsky,

Tatarinova

2023

Advanced Structured Materials

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Effect of Irradiation and Thermo-Induced Processes On Reactor in Vessel Elements During Long-Term Operation

Breslavsky¹,

Tatarinova²,

Kalchenko³

et al. 2022

Problems of Atomic Science and Technology

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A method for determining the effect of inhomogeneous temperature distribution, irradiation damage, irradiation swelling, irradiation creep of the material on the long-term strength of reactor in vessel internals and their deformation has been developed. The deformed state of the WWER type nuclear reactor baffle was determined. Constitutive equations taking into account the hidden damage of the material are proposed. According to the results of computer simulations, the strain fields of the section of the baffle during its operation for 60 years were analyzed, the place of possible occurrence of a macroscopic defect was determined.

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Stress–Strain State of Nuclear Reactor Core Baffle Under the Action of Thermal and Irradiation Fields

Cited by 3 publications

References 12 publications

Numerical Modeling of Hidden Damage Accumulation Due to Radiation Exposure and Hydrogen Embrittlement

Numerical Modeling of Hidden Damage Accumulation Due to Radiation Exposure and Hydrogen Embrittlement

Creep and Irradiation Effects in Reactor Vessel Internals

Effect of Irradiation and Thermo-Induced Processes On Reactor in Vessel Elements During Long-Term Operation

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