Roughness of the nuclear reactor pipe inner surface depending on the reactor operating time
During operation of nuclear reactors, there are various factors that affect the nuclear plant piping leading to erosion of the pipe inner surface and an increase of its micro-relief (roughness). Metal corrosion occurs and spreads faster on a surface having a higher value of the roughness parameter....
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| Format: | Article |
| Language: | English |
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National Research Nuclear University (MEPhI)
2019-12-01
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| Series: | Nuclear Energy and Technology |
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| Online Access: | https://nucet.pensoft.net/article/48394/download/pdf/ |
| _version_ | 1818759437596229632 |
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| author | Maksim A. Trofimov Ruslan A. Globa |
| author_facet | Maksim A. Trofimov Ruslan A. Globa |
| author_sort | Maksim A. Trofimov |
| collection | DOAJ |
| description | During operation of nuclear reactors, there are various factors that affect the nuclear plant piping leading to erosion of the pipe inner surface and an increase of its micro-relief (roughness). Metal corrosion occurs and spreads faster on a surface having a higher value of the roughness parameter. Failure through erosive wear of the parent metal takes place predominantly in the pipe bend area. The roughness of the pipe inner surface has a sizeable effect on the signal attenuation in the process of the pipe wall ultrasonic testing. Defective main pipeline segments were cut out during preventive repairs from which samples with different operating times were taken. Five defective pipe segments of the austenitic 12Kh18N10T grade steel cut out of a high-pressure reheater’s piping and five defective pipe segments of the perlite-class steel of grade 20, after different operating times, were used to determine experimentally the actual value of the pipe inner surface roughness. Besides, a piece of a new Ø273 × 12 pipe of the 12Kh18N10T steel and a piece of a Ø159 × 6 pipe of grade 20 steel were cut out. The inner surface roughness was measured for different segments. Dependences of the roughness value on the operating time and the pipe segment type have been obtained. Company specimens were fabricated with the inner surfaces having the roughness corresponding to various pipe operating times. This made it possible to take into account the influence of the inner surface roughness on the signal attenuation in the process of the weld integrity ultrasonic testing and during ultrasonic measurements of the weld adjacent zone grain size value following the weld repair. |
| first_indexed | 2024-12-18T06:42:43Z |
| format | Article |
| id | doaj.art-6956e20a71654f2cb64e8fa897e3c18f |
| institution | Directory Open Access Journal |
| issn | 2452-3038 |
| language | English |
| last_indexed | 2024-12-18T06:42:43Z |
| publishDate | 2019-12-01 |
| publisher | National Research Nuclear University (MEPhI) |
| record_format | Article |
| series | Nuclear Energy and Technology |
| spelling | doaj.art-6956e20a71654f2cb64e8fa897e3c18f2022-12-21T21:17:36ZengNational Research Nuclear University (MEPhI)Nuclear Energy and Technology2452-30382019-12-015431331610.3897/nucet.5.4839448394Roughness of the nuclear reactor pipe inner surface depending on the reactor operating timeMaksim A. Trofimov0Ruslan A. Globa1Obninsk Institute for Nuclear Power EngineeringObninsk Institute for Nuclear Power EngineeringDuring operation of nuclear reactors, there are various factors that affect the nuclear plant piping leading to erosion of the pipe inner surface and an increase of its micro-relief (roughness). Metal corrosion occurs and spreads faster on a surface having a higher value of the roughness parameter. Failure through erosive wear of the parent metal takes place predominantly in the pipe bend area. The roughness of the pipe inner surface has a sizeable effect on the signal attenuation in the process of the pipe wall ultrasonic testing. Defective main pipeline segments were cut out during preventive repairs from which samples with different operating times were taken. Five defective pipe segments of the austenitic 12Kh18N10T grade steel cut out of a high-pressure reheater’s piping and five defective pipe segments of the perlite-class steel of grade 20, after different operating times, were used to determine experimentally the actual value of the pipe inner surface roughness. Besides, a piece of a new Ø273 × 12 pipe of the 12Kh18N10T steel and a piece of a Ø159 × 6 pipe of grade 20 steel were cut out. The inner surface roughness was measured for different segments. Dependences of the roughness value on the operating time and the pipe segment type have been obtained. Company specimens were fabricated with the inner surfaces having the roughness corresponding to various pipe operating times. This made it possible to take into account the influence of the inner surface roughness on the signal attenuation in the process of the weld integrity ultrasonic testing and during ultrasonic measurements of the weld adjacent zone grain size value following the weld repair.https://nucet.pensoft.net/article/48394/download/pdf/Life extensionsurface roughnes |
| spellingShingle | Maksim A. Trofimov Ruslan A. Globa Roughness of the nuclear reactor pipe inner surface depending on the reactor operating time Nuclear Energy and Technology Life extension surface roughnes |
| title | Roughness of the nuclear reactor pipe inner surface depending on the reactor operating time |
| title_full | Roughness of the nuclear reactor pipe inner surface depending on the reactor operating time |
| title_fullStr | Roughness of the nuclear reactor pipe inner surface depending on the reactor operating time |
| title_full_unstemmed | Roughness of the nuclear reactor pipe inner surface depending on the reactor operating time |
| title_short | Roughness of the nuclear reactor pipe inner surface depending on the reactor operating time |
| title_sort | roughness of the nuclear reactor pipe inner surface depending on the reactor operating time |
| topic | Life extension surface roughnes |
| url | https://nucet.pensoft.net/article/48394/download/pdf/ |
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