Authors & Affiliations
Almjashev V.I.1,2, Sulatsky A.A.1,
Vitol S.A.1, Krushinov E.V.1, Kotova S.Yu.1,
Kalyago E.K.1, Bulygin V.R.1, Belyaeva E.M.1,
Shuvaeva E.B.1, Timchuk A.V.1
1 Alexandrov Research Institute of Technology, Sosnovy Bor, Russia
2 Saint Petersburg State Electrotechnical University “LETI”, Saint Petersburg, Russia
Almjashev V.I. – Head of Department, Ph.D. (Chem.), Alexandrov Research Institute of Technology (NITI). Associate Professor, Saint Petersburg State Electrotechnical University “LETI”.
Vitol S.A. – Head of Laboratory, Ph.D. (Tech.).
Krushinov E.V. – Lead Engineer.
Kotova S.Yu. – Senior Researcher, Ph.D. (Tech.).
Shevchenko E.V. – Group Leader.
Kalyago E.K. – Researcher.
Bulygin V.R. – Engineer.
Belyaeva E.M. – Engineer.
Shuvaeva E.B. – Engineer.
Timchuk A.V. – Trainee, Alexandrov Research Institute of Technology.
The paper is devoted to an experimental study of the features of the interaction between the lead-bismuth coolant and the steel of the fuel rod sheath for the conditions of a reactor plant accident, accompanied by a significant increase in the temperature of the coolant. Experimental modeling of a severe accident was carried out by exposing fuel rod sheath steel samples at lead-bismuth eutectic melt temperatures of ≈1190, ≈1240 and ≈1320 °C in a neutral atmosphere and ≈1120 °C air atmosphere. An experimental study was carried out on the “Rasplav-3” installation using the technology of induction melting in a cold crucible of the complex of experimental installations “Rasplav”. As a result of the experiment and post-test analyzes, it was shown, in particular, that when a fragment of the steel sheath of a fuel rod is exposed in a lead-bismuth eutectic melt with a temperature of ≈1320 °C, the steel actively dissolves in the melt, and during exposure for 60 min. the sample was almost completely dissolved. In addition, post-test analysis of the ingot revealed melt stratification into two immiscible layers. The composition of the first layer was close to lead-bismuth eutectic without steel components. The second layer contained, in addition to lead and bismuth, up to 50 wt. % steel components (iron and chromium). The data obtained can be used in the analysis and modeling of beyond design basis accidents at reactor plants with lead-bismuth coolant.
lead-bismuth coolant, fuel rod sheath, beyond design basis accidents, corrosion, temperature threshold, melt stratification
1. Almjashev V.I., Khabensky V.B., Krushinov E.V., Vitol S.A., Sulatsky A.A., Shevchenko E.V. Issledovanuya, vypolnennye na komplekse eksperimental’nykh ustanovok «Rasplav» otdela issledovaniy tyazhyolykh avariy FGUP «NITI im. A.P. Aleksandrova» [Studies carried out at the Rasplav complex of experimental facilities of the Severe Accident Research Department of Alexandrov Research Institute of Technology]. Tekhnologii obespecheniya zhiznennogo tsikla yadernykh energeticheskikh ustanovok – Nuclear Propulsion Reactor Plants. Life Cycle Management Technologies, 2020, no. 4 (22), pp. 69–89.
2. Petrov Yu.B. Induktsionnaya plavka okislov [Induction melting of oxides]. Leningrad, Energoatomizdat Publ., 1983. 104 p.
UDC 621.039.546, 621.039.586