Analysis of the Dynamic Behavior and Stress-Strain State of NPP Containment under Nonstationary Impacts

Lugovyy, P.Z.; Krytskyi, V.; Krytska, N.

doi:10.32918/nrs.2016.3(71).08

Cited by 2 publications

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“…Qualification criteria P cr and P cr ' must meet the regulatory requirements for confining safety systems [7].…”

Section: Qualification Conditions Of the Cldmmentioning

confidence: 99%

Qualification of Compensatory Test Methods Involving Pressure Increase in the VVER Containment System

Komarov,

Dorozh,

Filatov

2023

Nucl. and Rad. Safe.

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In general, containment leakage testing of nuclear power plants with VVER reactors by elevated pressures using the compensatory leakage detection method (CLDM) can be performed at pressures and pressure increase rates higher than those stipulated by the regulations using the absolute pressure method (AP method). Elevated pressures and pressure increase rates under certain conditions can violate safety limits of the containment systems and/or decrease the reliability/life of containment structures and equipment. These factors determine the need to qualify the CLDM to promote conditions for reliability and safety. A non-stationary thermodynamic model of the qualification conditions for CLDM testing of the containment was developed. The criteria for CLDM qualification conditions are the maximum allowable pressure and pressure increase rate during testing. The CLDM condition for recording leakage in the containment is pressure stabilization in the containment systems. Based on the developed CLDM thermodynamic model, it was established that the containment leakage rate is determined by the flow rate of air entering the containment systems and by the thermodynamic state of the air inside and outside the containment systems. The established qualification conditions were used to determine conditions for the minimum recorded leakage sizes within CLDM and the maximum allowable ambient air flow rates and test duration. A prerequisite for justifying the qualification and implementation of the CLDM is to revise/amend regulatory and technical requirements for the maximum allowable pressure and pressure change rate in the containment systems and for the conditions for disconnecting containment systems passive heat removal systems (if any) during testing.

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“…Qualification criteria P cr and P cr ' must meet the regulatory requirements for confining safety systems [7].…”

Section: Qualification Conditions Of the Cldmmentioning

confidence: 99%

Qualification of Compensatory Test Methods Involving Pressure Increase in the VVER Containment System

Komarov,

Dorozh,

Filatov

2023

Nucl. and Rad. Safe.

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“…Використання оболонкових конструкцій різного масштабу під час дії експлуатаційних навантажень дозволяє виріши-ти проблему матеріаломісткості зі збереженням необхідної конструктивної міцності й достатньої легкості. Яскравий приклад використання теорії оболонок для дослідження механічної поведінки великогабаритних об'єктів АЕС -дослідження захисної оболонки реакторних установок ВВЕР-1000, наведені в роботах [1], [2], а також дослідження та обґрунтування міцності та працездатності [3] - [5] Вступ обладнання і трубопроводів першого контуру АЕС, що виконуються, зокрема, для обґрунтування можливості довгострокової експлуатації АЕС. Упродовж всієї історії існування техніки спостерігається постійний природній інтерес до досліджень, спрямованих на зменшення матеріалоємності конструкцій з одночасним покращенням їх функціональних характеристик і підвищенням їх надійності.…”

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Oscillation of Thermal Insulation Three-Layer Cylindrical Pipes under Operating Loads

Lugovoi

Shugailo

Orlenko

et al. 2020

Nucl. and Rad. Safe.

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Equipment and pipes are the main components of a nuclear power plant (NPP) that ensure transfer of heat energy into electric one. The pipes with nominal diameter from DN10 to DN1200 are the main types of pipes that also include different fragments such as bends, cones, tees, branches, etc. Common length of all NPP pipes is hundreds of kilometers. All these components can be combined by one common feature: they are shell structures that found wide application in daily activities. The use of such components in the design and manufacture of equipment and pipelines of NPP power units requires appropriate practical and theoretical studies. The use of filler made of light materials allows for a small increase in the weight of the structure to significantly increase its bending stiffness and improve its thermal insulation properties. The oscillations of three-layer cylindrical pipes are considered in this paper. The equations of motion of a three-layer cylindrical shell with lightweight filler reinforced by stiffening ribs with non-stationary loading have been provided through these efforts. The model of Timoshenko’s theory of shells and rods have been used in this study under analysis of components with flexible structures. Numerical results of oscillations of the three-layer elastic structure were obtained using the finite element method. The impact of the physical and mechanical parameters of the shell layers is investigated on its stress strain state under an axisymmetric internal impulse loading.

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Analysis of the Dynamic Behavior and Stress-Strain State of NPP Containment under Nonstationary Impacts

Cited by 2 publications

References 0 publications

Qualification of Compensatory Test Methods Involving Pressure Increase in the VVER Containment System

Qualification of Compensatory Test Methods Involving Pressure Increase in the VVER Containment System

Oscillation of Thermal Insulation Three-Layer Cylindrical Pipes under Operating Loads

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