stackyFACTSWhen you have a vat of violently splitting uranium, you need an exceptionally strong emergency brake.
When you have a vat of violently splitting uranium, you need an exceptionally strong emergency brake. Hafnium fits the bill perfectly because it boasts an absolutely spectacular ability to absorb free neutrons. It is heavily favored in naval nuclear propulsion systems. Firing a hafnium control rod into a hyperactive reactor core shuts down the atomic chaos with extreme precision, preventing multi-billion dollar submarines from vaporizing.
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