Zircaloy-4

Cladding & Structural

Density: 6.56 g/cm³

Zirconium alloy cladding used primarily in PWRs. No nickel content, which improves hydrogen pickup resistance in PWR coolant chemistry.

Composition

Nuclide / Element	Fraction
Zirconium	0.981900
Tin	0.015000
Iron	0.002100
Chromium	0.001000

Code output

MCNP

c Zircaloy-4
c Density: 6.56 g/cm3 (use -6.56 on cell card)
c Weight fractions (nominal composition)
m10   40000.80c -0.9819  $ Zr (balance)
      50000.80c -0.0150  $ Sn
      26000.80c -0.0021  $ Fe
      24000.80c -0.0010  $ Cr

Notes

Nominal midrange composition. Standard PWR fuel cladding and structural material. No Ni content distinguishes it from Zircaloy-2.

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