Effect of neutron irradiation hardening of the base metal on the results of WWER-1000 reactor pressure vessel residual lifetime assessment

Kutsenko, O.; Kadenko, I. N.; Pitoiset, Xavier; Kharytonov, O. M.; Sakhno, Nadiia V.; Kravchenko, I. V.

doi:10.1016/j.ijpvp.2019.02.004

Cited by 5 publications

(16 citation statements)

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“…The calculation of C2, in addition to the continuous change in the heat transfer coefficient, also took into account the curvature of the cylinder, and the calculation of C3 took into account all three factors. In fact, the calculation of C3 repeated the calculation of the temperature field performed in [11], and their results coincide with great accuracy. Therefore, we will identify these calculations, and we will consider the calculation of C3 as a reference and use its results where the results given in [11] are missing.…”

Section: Resultsmentioning

confidence: 56%

“…In fact, the calculation of C3 repeated the calculation of the temperature field performed in [11], and their results coincide with great accuracy. Therefore, we will identify these calculations, and we will consider the calculation of C3 as a reference and use its results where the results given in [11] are missing.…”

Section: Resultsmentioning

confidence: 56%

“…As an example, on which the possibility of applying the obtained solution to practical calculations was investigated, we considered the model scenario of a thermal shock of a cylindrical body given in [11]. Dependences of its thermal-hydraulic parameters on time (coolant temperature T, heat transfer coefficient H and internal pressure p) are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…During the calculations, the geometric parameters of the cylinder were set equal to the geometric parameters of the cylindrical body shell: inner radius a = 2068 mm, cladding thickness h1 = 7 mm, base metal thickness h2 = 192.5 mm. The thermal and elastic properties of the materials were chosen similar to those of [11].…”

Section: Resultsmentioning

confidence: 99%

“…Using the results of [11] and additional calculations with the finite element package CalculiX [12], the contribution of each of these factors to the error of the final result was evaluated. The need for additional finite-element calculations was dictated by the limited data given in [11]. The analytical calculations were given for two degrees of discretization of the heat transfer coefficient: with its averaging at intervals between key moments of time and with averaging at each step.…”

Section: Resultsmentioning

confidence: 99%

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Study of axisymmetric stress-strain state of bilayer cylinder

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The previously obtained solution of a nonstationary heat conduction problem for a two-piece rod, one end of which is in convective heat exchange with the environment, is generalized to the case of an inhomogeneous initial temperature field. The solution is presented as an eigenform expansion of the corresponding boundary problem and is expressed in terms of elementary functions. The obtained generalization makes it possible to propose an algorithm for solving a general problem with arbitrarily varying ambient temperature and heat exchange coefficient. The relations are presented, which allow to find axisymmetric stress fields in a two-layer cylinder by the calculated temperature field in a two-layer rod also in an analytical form. A comparative analysis has been made of the results obtained on the basis of the proposed analytical algorithm and the results of numerical calculations by the finite-element method. The aim of this comparison was to determine the influence of different simplifying assumptions used in constructing the algorithm on the accuracy of the results. These assumptions include: disregard of the cylinder curvature in the heat conductivity problem, disregard of the temperature dependence of material properties, change in the heat transfer coefficient. The comparison was performed using the example of a cylindrical body part under the thermal shock scenario. For these conditions, in general, the deviation of temperature and stresses calculated from the proposed approach from numerical results did not exceed 3%. In this case, the main part of the error -1.7% was introduced by a change in the dependence of physical properties on temperature. The second largest factor introduced into the calculation of the error was the failure to take into account the curvature of the cylinder when solving the problem of heat conduction. It corresponds to an error of about 1.1%. Considering that the thermoshock scenario is boundary in terms of temperature change rate, it can be stated that the obtained analytical solution is sufficient for practical assessment of the axisymmetric stressstrain state of the corresponding equipment and pipelines.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of pressurized thermal shock on the failure of base-cladding composite wall with different thickness ratios in thermal–mechanical coupling field

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Algorithm of solving of nonstationary thermoelastic problem for two-layered cylinder at time-variety heat transfer coefficient

Kutsenko

Kharytonov

2021

BKNUPhM

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The nonstationary axisymmetric thermoelasticity problem for a two-layer cylinder at the inner surface of which convective heat transfer with an environment takes place is considered. The solution of this problem is derived for the case of inhomogeneous initial temperature field. The solution is presented in the form of development by the system of eigenfunctions of the boundary value problem for a two-component beam and expressed in terms of the elementary functions. Based on this solution, an incremental algorithm of solving thermoelasticity problems for a two-layer cylinder is proposed for the case that the heat transfer coefficient between the inner surface of the cylinder and environment is time-varied. The idea of the algorithm is to divide the entire transient time interval into a sequence of subintervals, the heat transfer coefficient is considered constant on each. Once the temperature field is determined, the axisymmetric stress field can be founded on the basis of analytical expressions. The proposed algorithm was tested on the example of the thermal shock scenario for a nuclear reactor vessel. The comparison of the obtained results with the numerical solution by the finite element method verified sufficient working accuracy of the proposed approach.

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Effect of neutron irradiation hardening of the base metal on the results of WWER-1000 reactor pressure vessel residual lifetime assessment

Cited by 5 publications

References 0 publications

Study of axisymmetric stress-strain state of bilayer cylinder

Study of axisymmetric stress-strain state of bilayer cylinder

Effect of pressurized thermal shock on the failure of base-cladding composite wall with different thickness ratios in thermal–mechanical coupling field

Algorithm of solving of nonstationary thermoelastic problem for two-layered cylinder at time-variety heat transfer coefficient

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