Global Nuclear Safety
National Research Nuclear University "MEPhI"
online version: ISSN 2499-9733
print version: ISSN 2305-414Х
2015-4(17)
Operation of nuclear industry facilities
| Article Name | Thermomechanical Loading Monitoring of Heat Carrier Collector Welding Joint to Steam Generators PGV-1000 Du1200 Branch Pipe |
|---|---|
| Authors | A.K. Adamenkov*, I.N. Veselova**, I.V. Malakhov* |
| Address | * «Rostov nuclear power plant» the branch OJSC «Rosenergoatom Concern», Volgodonsk-28, Rostov region, Russia 347340 |
| Abstract | In article possibility of one of operations directed to decrease in probability of welded joint zone damage of the VVER-1000 steam generator collector, namely, monitoring of thermomechanical loading of №111 welded seam at the steam generator operation is considered. The made analysis of welded joint destruction mechanism allowed to define that metal damage in the welding zone of the heat carrier collector to Du1200 branch pipe happens in the direction of MCP hot string from short forming a branch pipe, near a zone to the maximum mechanical tension. Diagnosing operations of № 111 welded joint zone of steam generator collectors were made by the Stressvision mechanical tension scanner (indicator) at the Rostov NPP for the purpose of mechanical loading control. The principle of the device operation is based on the phenomenon of magnetic anisotropy of ferromagnetic material products, i.e. magnetic state change under the influence of mechanical tension. The analysis of gradient distribution and of mechanical tension concentrators allows to draw a conclusion that the welded joint zone in the field of collector short forming is 2-3 times more strained than welded joint zone in the field of long forming that will be coordinated with the data provided by other researchers as the most possible emergence defect zone. Thus, periodic diagnosing by the Stressvision indicator of № 111 welded seam zone will allow to reveal and estimate possible changes of gradient and mechanical tension concentrators and to provide thermomechanical loading monitoring of heat carrier collector welding joint to steam generators Du1200 branch pipe. |
| Keywords | № 111 the weld joint, steam collectors, magnetic anisotropy, the gradients and mechanical tension concentrators, thermomechanical loading, Stressvision indicator |
| Language | Russian |
| References | [1] Trunov, N.B. Razrabotka i obosnovaniye meropriyatiy po obespecheniyu nadiozhnoy i bezopasnoy ekspluataysyi svarnykh soyedineniy № 111 parogeneratora PGV-1000M [Elaboration and grounds of measures for ensuring safe and reliable operation of welded connections 111 of steam generator PGV-1000M]. Obespecheniye bezopasnosti AES s VVER: sbornik tezisov Shestoy Mezhdunarodnoy naucho-tekhnicheskoy konferentsyi – Podolsk: OKB «Gidropress», 26-29 maya 2009 [Ensuring safety of NPPs with WWER type reactor: collected theses of 6th International scientific and technical conference – Podolsk: OKB «Gidropress», May 26-29, 2009], Podolsk, 2009 (in Russian) [2] Yermakov, E.L. Nekotoriye rezultaty nerazrushayuschego kontrolya metalla pervogo kontura okhlazhdeniya reaktora VVR-K. [Some results of nondestructive metal testing of WWR-K type reactor coolant circuit] Yadernaya i radiatsyonnaya fizika: sbornik tezisov Devyatoy Mezhdunarodnoy konferentsyi, Kazakhstan, Almaty, 24-27 sent. 2013 [Nuclear and radiation physics: collected theses of 9th International conference, Kazakhstan, Almaty, September 24-27, 2013]. Almaty, 2013, ISBN 9965-675-85-6 (in Russian) [3] Skaner mekhanicheskikh napryazheniy STRESSVISION. [The mechanical stress scanner STRESSVISION]. Available at: http://www.stressvision.ru (in Russian) [4] Capabilities of the method for evaluation of stressed-deformed state at inspection of nuclear power facilities. Available at: http://www.ndt.net/article/ecndt2010/reports/1_12_06.pdf (in English) [5] Applied magnetic field and stress induced anisotropy dependence of energy for oriented ferromagnetic thick films. Available at: http://www.kln.ac.lk/uokr/journals/J4/Journal_4-1.pdf (in English) [6] Jensen. P.J. & H. Dreysse. 2002. In-plane magnetic reorientation in coupled ferro and antiferromagnetic thin films. Physical Review В 66: 220407-1-4. ISSN 1098-0121 (in English) [7] Samarasekara, P. 2006. A solution of the Heisenberg Hamiltonian for oriented thick ferromagnetic films. Chinese Journal of Physics 44(5): 377-386. ISSN 0577-9073 (in English) [8] Shan-Ho. Tsai. D.P. Landau & С Thomas Schulthess. 2003. Effect of interfacial coupling on the magnetic ordering in ferro-antiferromagnetic bilayers. Journal of Applied Physics 93(10): 8612-8614. ISSN 0021-8979 (in English) |
| Papers | 84 - 89 |
| URL Article | URL Article |
| Open Article |