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the claim

Nuclear reactors continue to generate heat even when they are not actively producing power.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that nuclear reactors continue to generate heat even when they are not actively producing power?

Yes. Nuclear reactors continue to produce residual thermal energy after shutdown due to the radioactive decay of fission products, a phenomenon commonly referred to as decay heat.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The claim is a specific, well-established physical fact about nuclear reactors. Multiple papers in the literature discuss 'decay heat' or the thermal energy generated by spent fuel and shutdown reactors due to radioactive decay.

Evidence for · 4
Development of computer code IGDC for generation and depletion of fission products and actinides in pressure tube type heavy water reactors (PT-HWRs) using Klopfenstien-Shampine numerical differentiation formula (NDF)
2019
Discusses the generation of decay heat from isotopes produced over the fuel cycle in heavy water reactors.
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Chauthwani, G. C. & Kannan, U. (2019). Development of computer code IGDC for generation and depletion of fission products and actinides in pressure tube type heavy water reactors (PT-HWRs) using Klopfenstien-Shampine numerical differentiation formula (NDF). doi.org. https://doi.org/10.1016/J.NUCENGDES.2018.11.006

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More for · 3
Spent Nuclear Fuel—Waste to Resource, Part 1: Effects of Post-Reactor Cooling Time and Novel Partitioning Strategies in Advanced Reprocessing on Highly Active Waste Volumes in Gen III(+) UOx Fuel Systems
2025
Examines high-heat radionuclides and post-reactor cooling times associated with spent nuclear fuel.
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Holdsworth, A., Ireland, E., & Eccles, H. (2025). Spent Nuclear Fuel—Waste to Resource, Part 1: Effects of Post-Reactor Cooling Time and Novel Partitioning Strategies in Advanced Reprocessing on Highly Active Waste Volumes in Gen III(+) UOx Fuel Systems. doi.org. https://doi.org/10.3390/jne6030029

Method of Evaluating SMR Decay Heat Removal in a Floating Nuclear Power Plant During Vessel Flooding Scenarios
2025
Analyzes decay heat removal requirements after a reactor shutdown in floating nuclear power plants.
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Kourasis, I., Vilariño, R., Hamilton, O., Ahonsi, B., Chaplin, R., & Davies, T. (2025). Method of Evaluating SMR Decay Heat Removal in a Floating Nuclear Power Plant During Vessel Flooding Scenarios. doi.org. https://doi.org/10.4043/35903-ms

NUCLEAR DATA UNCERTAINTY QUANTIFICATION FOR THE DECAY HEAT OF PWR MOX FUELS USING DATA ASSIMILATION OF ELEMENTARY FISSION BURSTS
2021
Quantifies uncertainties regarding the decay heat of nuclear fuels during cooling times.
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Vallet, V., Huyghe, J., Vaglio-Gaudard, C., Lecarpentier, D., & Reynard-Carette, C. (2021). NUCLEAR DATA UNCERTAINTY QUANTIFICATION FOR THE DECAY HEAT OF PWR MOX FUELS USING DATA ASSIMILATION OF ELEMENTARY FISSION BURSTS. doi.org. https://doi.org/10.1051/EPJCONF/202124710002

What does the evidence say?

The claim is a specific, well-established physical fact about nuclear reactors. Multiple papers in the literature discuss 'decay heat' or the thermal energy generated by spent fuel and shutdown reactors due to radioactive decay.

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