Originally classified СОВЕРШЕННО СЕКРЕТНО / Completely Secret. Partially declassified 14 March 2031 under the Scientific Heritage Transparency Act (2029). Registration No.: MEiE-1990-SZ-0047. Copy No. 3 of 5. Marginal annotations confirmed as Gorbachev’s hand by the State Archive of the Russian Federation.
To: General Secretary of the CC CPSU M. S. Gorbachev
Copies to: Chairman of the Council of Ministers N. I. Ryzhkov
Deputy Chairman of the Council of Ministers for the Fuel-Energy Complex
Chairman of Gosplan USSR
From: Minister of Energy and Electrification of the USSR P. S. Neporozhny
Date: 14 February 1990
Re: Strategic reorientation of Soviet energy — justification for a
long-term thorium fuel cycle programme
I. PURPOSE OF THIS MEMORANDUM
This memorandum is submitted at the Minister’s own initiative, outside the scheduled reporting cycle, because the Minister believes the matter cannot wait for the scheduled cycle.
It addresses a single question: what is the correct strategic response of the Soviet state to the lessons of the Chernobyl Nuclear Power Plant accident of April 1986?
The official response to that question, as implemented over the past four years, has been procedural. Safety review commissions. Revised operating protocols. Revised personnel certification standards. Reactor design modifications to existing RBMK units. These measures are appropriate. They are also insufficient. They address the symptoms of the Chernobyl event without addressing its cause.
The cause, in the Minister’s assessment, is architectural. The RBMK reactor design contains a physical instability — the positive void coefficient — that under specific and not-improbable conditions produces runaway chain reactions that no operator intervention can arrest. We did not have a safety protocol failure at Chernobyl. We had a reactor that, under the conditions that obtained on the night of 26 April 1986, could not be made safe by any action available to the operators. The operators did not fail the reactor. The reactor failed the operators.
Modifying safety procedures for an architecturally unsafe design is not engineering. It is optimism.
The Minister therefore submits that the correct strategic response to Chernobyl is not procedural reform of existing nuclear architecture but transition, over a defined timeline, to a nuclear architecture that does not carry the Chernobyl failure mode as a structural property.
That architecture exists. It is the thorium fuel cycle, in combination with molten salt reactor technology. The remainder of this memorandum presents the case for a state programme to develop and deploy it.
[Marginal annotation: “Neporozhny is always direct. Read carefully. — MG”]
II. THE ENERGY DEPENDENCY PROBLEM
Before addressing the technical argument, the Minister wishes to address the strategic one, because the strategic argument is the more important of the two and has been insufficiently acknowledged in internal discussions.
The Soviet Union currently derives approximately 63% of its hard currency export earnings from the sale of petroleum and natural gas to foreign buyers, primarily Western European states and, through intermediaries, global markets. This figure has been stable or increasing for fifteen years. It is not a temporary condition. It is a structural feature of the Soviet economy as currently constituted.
The implications of this structural feature are as follows:
First: The Soviet state’s fiscal capacity — its ability to fund defence, industry, social provision, and the scientific programmes that underpin its strategic position — is materially dependent on the continued willingness of foreign buyers to purchase Soviet hydrocarbons at prices sufficient to sustain that fiscal capacity. This dependency is not theoretical. The price shock of 1986, when global oil prices fell by more than half, reduced Soviet hard currency revenues by an amount that contributed directly to the fiscal pressures currently experienced by the state. We did not cause that price shock. We could not prevent it. We absorbed it.
Second: Any state that controls a significant share of global oil supply has, in consequence, a degree of indirect leverage over Soviet fiscal capacity. The Minister does not believe this leverage is currently being exercised in a coordinated manner. The Minister does believe it could be, under conditions of sufficient strategic motivation on the part of actors who understand the Soviet fiscal position. The conclusion that the Soviet state’s strategic independence is partially hostage to global hydrocarbon markets is not alarmist. It is arithmetic.
Third: The Soviet Union possesses, within its own territory, the largest thorium reserves on Earth. Estimates from the Ministry of Geology place recoverable thorium deposits in the Kola Peninsula, the Ural region, and Eastern Siberia at a combined total sufficient to fuel a thorium-cycle national power programme for a minimum of three hundred years at projected demand levels. We are not proposing to replace one dependency with another. We are proposing to replace a dependency on a globally traded commodity we do not control with a dependency on a domestic resource we do.
The energy independence argument and the post-Chernobyl safety argument point in the same direction. This is not a coincidence. It is the signature of a correct solution.
[Marginal annotation: “The arithmetic is correct. I want Gosplan to verify the reserve figures independently. — MG”]
III. THE TECHNICAL CASE FOR THORIUM
The Minister will not reproduce in this memorandum the full technical literature on thorium fuel cycle reactors, which is available through FEI and the Kurchatov Institute and has been provided to the General Secretary’s scientific advisory staff. He will instead summarise the properties relevant to the strategic decision.
Thorium-232 is not fissile. It cannot sustain a chain reaction on its own. A thorium reactor requires a fissile seed — typically uranium-233, produced by irradiating thorium-232 with neutrons, or alternatively low-enriched uranium-235 for initial startup. Once the seed initiates the reaction, the thorium absorbs neutrons and converts to uranium-233, which sustains the chain. The reactor is, in steady operation, partly breeding its own fuel.
The positive void coefficient does not apply. The runaway instability that destroyed Reactor No. 4 at Chernobyl is a property of graphite-moderated water-cooled reactor design under specific power conditions. Molten salt reactor architecture — in which the fuel is dissolved in a fluoride salt that serves simultaneously as fuel carrier and coolant — does not exhibit this behaviour. If the reaction rate increases, the salt expands, the neutron flux decreases, the reaction slows. The physics is self-correcting in the direction of safety, not in the direction of escalation. There is no credible physical pathway from a molten salt thorium reactor to a Chernobyl-class event. This is not a matter of improved operator training or revised emergency protocols. It is a matter of physics.
Waste profile is substantially reduced. Conventional uranium fission produces a range of long-lived transuranic isotopes — plutonium, americium, neptunium — that remain biologically hazardous for timescales measured in tens of thousands of years and represent a permanent liability for any state that accumulates them. The thorium fuel cycle produces these isotopes in quantities approximately two to three percent of those produced by equivalent uranium fission. The waste that is produced has significantly shorter decay timescales.
Weaponisation is substantially more difficult. Uranium-233, produced in the thorium cycle, is contaminated with uranium-232, which produces a highly penetrating gamma radiation signature that makes weapon fabrication technically demanding and covert development detectable. A Soviet commitment to thorium-cycle civilian nuclear development is a commitment that carries inherent non-proliferation properties, which may be of value in international discussions.
[Marginal annotation: “The weapons point is interesting. Discuss with Shevardnadze. — MG”]
IV. PROPOSED PROGRAMME STRUCTURE
The Minister proposes a phased national programme, to be funded from a dedicated allocation of hydrocarbon export revenues, structured as follows:
Phase One (1990–1998): Research and experimental validation Concentration of thorium fuel cycle research at FEI Obninsk under a dedicated programme directorate. Modification of the existing BN-600 fast reactor infrastructure to accept thorium oxide fuel assemblies in experimental configuration. Target: first sustained criticality on thorium fuel cycle by end of decade. Estimated cost: 2.4 billion roubles over eight years, funded from a 0.8% levy on hydrocarbon export revenue.
Phase Two (1998–2010): Engineering scale-up Design and construction of first commercial-prototype thorium reactor, minimum 600 megawatts electric, at a site to be determined in consultation with the Ministry of Geology based on proximity to domestic thorium deposits and grid infrastructure. Parallel construction of fuel cycle processing infrastructure. Target: first commercial-prototype unit operational by 2010. Estimated cost: 18–24 billion roubles, funded from continued hydrocarbon export levy, escalating to 1.4% as export revenues permit.
Phase Three (2010–2025): National deployment Progressive replacement of coal and oil-fired generating capacity, and oldest RBMK nuclear units, with thorium capacity. Target: thorium generation representing 40% of national grid output by 2025.
Funding mechanism: The Minister proposes that the hydrocarbon export levy be constituted as a protected fund — Фонд энергетической независимости, the Energy Independence Fund — with dedicated accounting separate from the general state budget, not subject to reallocation for other purposes without direct authorisation at the level of the Council of Ministers.
[Marginal annotation: “The protected fund proposal is correct. Draft the enabling resolution. — MG”]
V. A NOTE ON TIMING
The Minister is aware that this proposal arrives at a moment of considerable pressure on the state’s attention and resources. He submits it now precisely because of that pressure, not in spite of it.
Energy independence is not a technical question. It is a question about what kind of sovereignty the Soviet Union intends to have in the century ahead.
The Minister has been in this ministry for thirty-one years. He has watched the Soviet energy system built from almost nothing into the largest generating capacity on Earth. He will not be here to see what comes next. He submits this memorandum because he believes what comes next matters, and because he believes someone should say so plainly while there is still time to act on it.
[Marginal annotation: “He will outlast us all. Authorise Phase One. — MG”]
VI. RECOMMENDED ACTION
The Minister requests the General Secretary’s authorisation to:
- Constitute the Energy Independence Fund as a protected budget line, funded by hydrocarbon export levy at 0.8% commencing fiscal year 1991.
- Establish a Thorium Programme Directorate at FEI Obninsk under Ministry of Energy authority, with Academician G. V. Serov as proposed Programme Director.
- Initiate Phase One experimental programme as described above, with first progress review scheduled for December 1992.
P. S. Neporozhny Minister of Energy and Electrification of the USSR 14 February 1990
[Archivist’s note, FEI Institute Archive, 2031: This document was among 847 pages of Ministry of Energy internal correspondence partially declassified under the 2029 Scientific Heritage Transparency Act. Marginal annotations confirmed as authorial by handwriting analysis against known Gorbachev documents held at the State Archive of the Russian Federation. Neporozhny died 28 February 1999, eleven months after BN-T1 achieved first criticality at Obninsk. He did not see Phase Two completed. Academician Serov, named in this document as proposed Programme Director, confirmed the appointment in March 1990 and held the position until his retirement in 2011.]
Related sources: TASS: BN-T1 First Criticality (1998) | Reuters: Cuba’s Soviet-Built Thorium Plant (2013)