Lead

Moderators & Coolants

Density: 11.35 g/cm³

Natural lead coolant. Used in lead-cooled fast reactors (LFRs) for its high boiling point, good neutron economy, and shielding properties.

Composition

Nuclide / Element	Fraction
Lead (natural)	1.000000

Code output

MCNP

c Lead (natural)
c Density: 11.35 g/cm3 (use -11.35 on cell card)
m24   82000.80c  1.000000  $ Pb (natural)

Notes

Density at room temperature. At LFR operating temperature (~480°C), density is ~10.52 g/cm³. Natural Pb: 1.4% Pb-204, 24.1% Pb-206, 22.1% Pb-207, 52.4% Pb-208.

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