Registration Number
0221U000008,
0118U000464
, R & D reports
Title
Development of a methodology for technical condition assesstment and lifetime prediction of the 2nd circuit of nuclear power unit components considering hydrogen influance
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Head
Іваницький Ярослав Лаврентійович,
Registration Date
02-01-2021
Organization
Karpenko Physico-Mechanical Institute of NASU
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A method for assessing the durability of structural elements operating in a hydrogen-containing environment with a time-variable temperature has been developed. The basis of this technique is the energy criterion of destruction, a computer program has been created to determine the characteristics of the stress-strain state and the energy of deformation and the experimental determination of their limiting values, taking into account the action of hydrogen with a variable temperature in time.
The value of the specific energy of destruction was established as an invariant characteristic of the material withstand deformation and fracture for steel 22K with and without taking into account the effect of hydrogen. It is shown that the process of elastic-plastic deformation in hydrogen leads to a decrease in Poisson's ratio.
It was found that preliminary plastic deformation followed by saturation of the metal with hydrogen reduces the specific fracture energy to 20% and accelerates the accumulation of energy damage to the metal. In elastic deformation of 22K steel in a hydrogen-containing medium, the fracture resistance characteristics, in particular, the specific fracture energy, change insignificantly.
The stress-strain state and the durability of the straight section of the heat-exchange tubes of three types of steam generators made of 08Kh18N10T austenitic steel have been determined and it has been established that hydrogen saturation reduces its resource to 16%. The combined action of hydrogen and 5% magnesium chloride solution reduces the durability by up to 60%.
The stress-strain state and the durability of the model of the casing of a direct-flow steam generator under operating conditions have been determined. It was found that a 3-fold increase in the cooling rate of the case increases the degree of energy damage up to 60%.
Product Description
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Ivanytskyi Yaroslav L.
Boyko Vasylʹ M.
Hvozdyuk Mykola Mar'yanovych
Hembara Oksana V.
Hrynenko Mykhajlo V.
Dmytriv Zynoviy V.
Sapuzhak Yaroslav І.
Chaban Petro M.
Chepilʹ Olʹha Ya.
Chernysh Mariya Stepanivna
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2021-01-02
