Valery Legasov

Record year1967–1984

summaryParticipated in extending research on the synthesis and properties of noble-gas and rare-element compounds at high oxidation states, and organized Soviet research teams.

M rationaleThis family extended the synthesis and study of properties of noble-gas and unusually high-oxidation-state compounds, a reviewable experimental-chemistry outcome; M is valued by the range of objects and independent increment of knowledge. Insufficient paper-by-paper author-role detail enters unresolved attribution and gaps, rather than directly lowering civilizational value because sources are commemorative or original texts are difficult to obtain.

attribution rationaleValery Legasov .24; Kurchatov Institute noble-gas chemistry team .38; Neil Bartlett and noble-gas chemistry prior work .16; Soviet inorganic-materials research and instrumentation team .10; original peer-reviewed publication chain .05; unresolved share .07. The shares are provisional research estimates.

overlap boundaryCount individual and team residue in research on the synthesis and properties of noble-gas compounds and high-oxidation-state materials, from the 1967 paper to before 1984; do not take credit for Bartlett's original creation, nuclear-industry applications, or the entire Soviet discipline.

Evidence gapsThe original papers' experiments and author roles have not been read paper by paper; the ‘Bartlett–Legasov effect’ comes from a commemorative source and is not used as a basis for M.

Record year1980

summaryBefore the accident, publicly explained that even with safety measures, core damage and radioactive release could still occur under particular conditions, and incorporated system limitations and severe consequences into the safety argument.

M rationaleThis is a specific shared knowledge deliverable formed before the accident, capable of correcting excessive confidence that existing safety measures can exclude severe accidents; its scope is limited to public risk argumentation, and it has not been shown to have changed design or regulation, so it is valued as an important safety-analysis text.

attribution rationaleValery Legasov .10; N. S. Babaev .10; I. I. Kuzmin .10; other co-authors of the 1980 safety paper .22; Soviet nuclear-safety materials and analysis team .18; reactor-safety and risk-analysis prior work .18; contemporaneous Nature publication chain .04; unresolved share .08. The shares are provisional research estimates.

overlap boundaryCount only the public risk argument in the 1980 co-authored paper ‘Nuclear Power Plant Safety Issues’ concerning the possibility of severe accidents, core damage, and radioactive release, and the identifiable safety-methodology knowledge arising from it; do not take credit for nuclear-plant design, operations, regulatory implementation, Chernobyl response, or the 1986 report.

Evidence gapsThe full text of the 1980 paper was not obtained in this round, so the complete author list, argument methods, and data cannot be checked paragraph by paragraph; there is still no evidence that the paper changed specific reactor design or regulation in the 1980s, so implementation effects are not written into scope.