Authors & Affiliations
Almjashev V.I.1,2, Sulatsky A.A.1,
Vitol S.A.1, Krushinov E.V.1, Kotova S.Yu.1,
Shevchenko E.V.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”.
Sulatsky A.A. – Associate Professor, Lead Researcher, Ph.D. (Tech.). Contacts: 72 Koporskoe shosse, Sosnovy Bor, Leningrad region, Russia, 188540. Tel.: +7 (913) 756-81-61; e-mail:
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.
Abstract
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.
Keywords
lead-bismuth coolant, fuel rod sheath,
beyond design basis accidents, corrosion, temperature threshold, melt
stratification
Article Text (PDF, in Russian)
UDC 621.039.546, 621.039.586
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2022, issue 2, 1:7