Zircaloy-2

Cladding & Structural

Density: 6.56 g/cm³

Atom density: 0.043483 atoms/b·cm

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

Where these numbers come from

PNNL-15870 Rev. 2, "Zircaloy-2" (id zircaloy-2): density and full isotopic composition are taken from the compendium unchanged.

Open the compendium entry for the isotope-by-isotope table and the compendium's own notes.

Material compositions from PNNL-15870 Rev. 2 (April 2021), R.S. Detwiler, R.J. McConn Jr., T.F. Grimes, S.A. Upton, and E.J. Engel, Compendium of Material Composition Data for Radiation Transport Modeling, Pacific Northwest National Laboratory. Full report (DOI 10.2172/1782721)

Composition

Nuclide (ZAID)	Weight fraction	Atom fraction	Atom density (atoms/b·cm)
O-16 (8016)	1.1938e-3	6.7809e-3	2.9484e-4
O-17 (8017)	4.8328e-7	2.5830e-6	1.1231e-7
O-18 (8018)	2.7606e-6	1.3935e-5	6.0590e-7
Cr-50 (24050)	4.1612e-5	7.5695e-5	3.2913e-6
Cr-52 (24052)	8.3448e-4	1.4597e-3	6.3470e-5
Cr-53 (24053)	9.6446e-5	1.6552e-4	7.1969e-6
Cr-54 (24054)	2.4460e-5	4.1201e-5	1.7915e-6
Fe-54 (26054)	5.6286e-5	9.4808e-5	4.1224e-6
Fe-56 (26056)	9.1626e-4	1.4883e-3	6.4713e-5
Fe-57 (26057)	2.1539e-5	3.4371e-5	1.4945e-6
Fe-58 (26058)	2.9167e-6	4.5742e-6	1.9889e-7
Ni-58 (28058)	3.3532e-4	5.2585e-4	2.2865e-5
Ni-60 (28060)	1.3361e-4	2.0256e-4	8.8074e-6
Ni-61 (28061)	5.9050e-6	8.8050e-6	3.8285e-7
Ni-62 (28062)	1.9136e-5	2.8075e-5	1.2207e-6
Ni-64 (28064)	5.0301e-6	7.1489e-6	3.1084e-7
Zr-90 (40090)	4.9811e-1	5.0338e-1	2.1888e-2
Zr-91 (40091)	1.0984e-1	1.0977e-1	4.7731e-3
Zr-92 (40092)	1.6973e-1	1.6779e-1	7.2958e-3
Zr-94 (40094)	1.7575e-1	1.7004e-1	7.3937e-3
Zr-96 (40096)	2.8918e-2	2.7395e-2	1.1912e-3
Sn-112 (50112)	1.2767e-4	1.0365e-4	4.5070e-6
Sn-114 (50114)	8.8418e-5	7.0527e-5	3.0666e-6
Sn-115 (50115)	4.5949e-5	3.6332e-5	1.5798e-6
Sn-116 (50116)	1.9820e-3	1.5537e-3	6.7558e-5
Sn-117 (50117)	1.0560e-3	8.2068e-4	3.5684e-5
Sn-118 (50118)	3.3586e-3	2.5881e-3	1.1254e-4
Sn-119 (50119)	1.2013e-3	9.1792e-4	3.9912e-5
Sn-120 (50120)	4.5945e-3	3.4815e-3	1.5138e-4
Sn-122 (50122)	6.6383e-4	4.9476e-4	2.1513e-5
Sn-124 (50124)	8.4378e-4	6.1872e-4	2.6903e-5

This is the material as formulated. The cards below carry weight fractions, written negative, which is what MCNP and Serpent read as a mass basis.

What ENDF/B-VII.1 forced

O18 folded into O16: ENDF/B-VII.1 has no O18 evaluation (2.7606e-6 by weight, so the spectrum does not care).

The cards keep the material's mass and atom count; a nuclide the library cannot name hands its share to one it can. That is why a card row can differ slightly from the table above.

Generated material cards

MCNP

c Zircaloy-2
c PNNL-15870 Rev. 2, "Zircaloy-2" - reactormc.net/nrdp/material/zirc2; rho =
c 6.56 g/cm3 (use -6.56 on the cell card)
c O18 folded into O16: ENDF/B-VII.1 has no O18 evaluation (2.7606e-6 by weight,
c so the spectrum does not care).
m9    8016.80c  -0.001197  $ O16
      8017.80c  -4.8328e-7  $ O17
      24050.80c  -4.1612e-5  $ Cr50
      24052.80c  -8.3448e-4  $ Cr52
      24053.80c  -9.6446e-5  $ Cr53
      24054.80c  -2.4460e-5  $ Cr54
      26054.80c  -5.6286e-5  $ Fe54
      26056.80c  -9.1626e-4  $ Fe56
      26057.80c  -2.1539e-5  $ Fe57
      26058.80c  -2.9167e-6  $ Fe58
      28058.80c  -3.3532e-4  $ Ni58
      28060.80c  -1.3361e-4  $ Ni60
      28061.80c  -5.9050e-6  $ Ni61
      28062.80c  -1.9136e-5  $ Ni62
      28064.80c  -5.0301e-6  $ Ni64
      40090.80c  -0.498109  $ Zr90
      40091.80c  -0.109835  $ Zr91
      40092.80c  -0.169730  $ Zr92
      40094.80c  -0.175752  $ Zr94
      40096.80c  -0.028918  $ Zr96
      50112.80c  -1.2767e-4  $ Sn112
      50114.80c  -8.8418e-5  $ Sn114
      50115.80c  -4.5949e-5  $ Sn115
      50116.80c  -0.001982  $ Sn116
      50117.80c  -0.001056  $ Sn117
      50118.80c  -0.003359  $ Sn118
      50119.80c  -0.001201  $ Sn119
      50120.80c  -0.004594  $ Sn120
      50122.80c  -6.6383e-4  $ Sn122
      50124.80c  -8.4378e-4  $ Sn124

MCNP and Serpent cards use .80c (ENDF/B-VII.1 at 293.6 K) — renumber m1 and change the suffix to match your deck. SCONE compositions are atom densities in atoms/barn-cm with the .03 suffix matching temp 300. See the library reference before changing a suffix: the mapping is not portable between vendors.

Notes

The compendium formulation includes the alloy's oxygen (0.12 wt%), which the old hand-written entry omitted. Nickel is what distinguishes Zircaloy-2 from Zircaloy-4.

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