Zircaloy-4

Cladding & Structural

Density: 6.56 g/cm³

Atom density: 0.043496 atoms/b·cm

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

Where these numbers come from

PNNL-15870 Rev. 2, "Zircaloy-4" (id zircaloy-4): 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)	1.1929e-3	6.7735e-3	2.9463e-4
O-17 (8017)	4.8293e-7	2.5802e-6	1.1223e-7
O-18 (8018)	2.7585e-6	1.3919e-5	6.0545e-7
Cr-50 (24050)	4.1600e-5	7.5647e-5	3.2904e-6
Cr-52 (24052)	8.3424e-4	1.4588e-3	6.3451e-5
Cr-53 (24053)	9.6418e-5	1.6541e-4	7.1949e-6
Cr-54 (24054)	2.4453e-5	4.1175e-5	1.7910e-6
Fe-54 (26054)	1.1254e-4	1.8950e-4	8.2424e-6
Fe-56 (26056)	1.8320e-3	2.9747e-3	1.2939e-4
Fe-57 (26057)	4.3065e-5	6.8698e-5	2.9881e-6
Fe-58 (26058)	5.8317e-6	9.1425e-6	3.9767e-7
Zr-90 (40090)	4.9786e-1	5.0295e-1	2.1877e-2
Zr-91 (40091)	1.0978e-1	1.0968e-1	4.7708e-3
Zr-92 (40092)	1.6965e-1	1.6765e-1	7.2922e-3
Zr-94 (40094)	1.7566e-1	1.6990e-1	7.3900e-3
Zr-96 (40096)	2.8904e-2	2.7371e-2	1.1906e-3
Sn-112 (50112)	1.2761e-4	1.0357e-4	4.5048e-6
Sn-114 (50114)	8.8375e-5	7.0468e-5	3.0651e-6
Sn-115 (50115)	4.5926e-5	3.6302e-5	1.5790e-6
Sn-116 (50116)	1.9811e-3	1.5524e-3	6.7526e-5
Sn-117 (50117)	1.0555e-3	8.2000e-4	3.5667e-5
Sn-118 (50118)	3.3570e-3	2.5860e-3	1.1248e-4
Sn-119 (50119)	1.2007e-3	9.1716e-4	3.9893e-5
Sn-120 (50120)	4.5923e-3	3.4786e-3	1.5131e-4
Sn-122 (50122)	6.6351e-4	4.9435e-4	2.1502e-5
Sn-124 (50124)	8.4337e-4	6.1820e-4	2.6890e-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 (2.7585e-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-4
c PNNL-15870 Rev. 2, "Zircaloy-4" - reactormc.net/nrdp/material/zirc4; 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 (2.7585e-6 by weight,
c so the spectrum does not care).
m10    8016.80c  -0.001196  $ O16
       8017.80c  -4.8293e-7  $ O17
       24050.80c  -4.1600e-5  $ Cr50
       24052.80c  -8.3424e-4  $ Cr52
       24053.80c  -9.6418e-5  $ Cr53
       24054.80c  -2.4453e-5  $ Cr54
       26054.80c  -1.1254e-4  $ Fe54
       26056.80c  -0.001832  $ Fe56
       26057.80c  -4.3065e-5  $ Fe57
       26058.80c  -5.8317e-6  $ Fe58
       40090.80c  -0.497860  $ Zr90
       40091.80c  -0.109780  $ Zr91
       40092.80c  -0.169646  $ Zr92
       40094.80c  -0.175665  $ Zr94
       40096.80c  -0.028904  $ Zr96
       50112.80c  -1.2761e-4  $ Sn112
       50114.80c  -8.8375e-5  $ Sn114
       50115.80c  -4.5926e-5  $ Sn115
       50116.80c  -0.001981  $ Sn116
       50117.80c  -0.001055  $ Sn117
       50118.80c  -0.003357  $ Sn118
       50119.80c  -0.001201  $ Sn119
       50120.80c  -0.004592  $ Sn120
       50122.80c  -6.6351e-4  $ Sn122
       50124.80c  -8.4337e-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

Zirconium, tin, iron and chromium are written as isotopes: ENDF/B-VII.1 has no natural-element evaluations for them, so `40000.80c` and `26000.80c` are missing-table errors.

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