Zircaloy-2

Cladding & Structural

Density: 6.56 g/cm³

Zirconium alloy cladding used primarily in BWRs. Low neutron absorption cross section with good corrosion resistance.

Composition

Nuclide / Element	Fraction
Zirconium	0.982300
Tin	0.015000
Iron	0.001200
Chromium	0.001000
Nickel	0.000500

Code output

MCNP

c Zircaloy-2
c Density: 6.56 g/cm3 (use -6.56 on cell card)
c Weight fractions (nominal composition)
m9    40000.80c -0.9823  $ Zr (balance)
      50000.80c -0.0150  $ Sn
      26000.80c -0.0012  $ Fe
      24000.80c -0.0010  $ Cr
      28000.80c -0.0005  $ Ni

Notes

Nominal midrange composition. Zircaloy-2 contains Ni (unlike Zircaloy-4), making it less suited for PWR water chemistry but standard for BWR fuel cladding.

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