Stainless Steel 316

Cladding & Structural

Density: 8 g/cm³

Atom density: 0.087134 atoms/b·cm

Molybdenum-bearing austenitic stainless steel with improved corrosion resistance. Used in fast reactor cladding, PWR internals, and hot-leg piping.

Where these numbers come from

PNNL-15870 Rev. 2, "Steel, Stainless 316" (id steel-stainless-316): 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)
C-12 (6012)	7.9074e-4	3.6434e-3	3.1746e-4
C-13 (6013)	9.2675e-6	3.9406e-5	3.4336e-6
Mn-55 (25055)	2.0000e-2	2.0128e-2	1.7539e-3
P-31 (15031)	4.5000e-4	8.0329e-4	6.9994e-5
S-32 (16032)	2.8412e-4	4.9134e-4	4.2813e-5
S-33 (16033)	2.3134e-6	3.8794e-6	3.3803e-7
S-34 (16034)	1.3506e-5	2.1984e-5	1.9155e-6
S-36 (16036)	3.3648e-8	5.1726e-8	4.5071e-9
Si-28 (14028)	9.1868e-3	1.8156e-2	1.5820e-3
Si-29 (14029)	4.8337e-4	9.2233e-4	8.0367e-5
Si-30 (14030)	3.2999e-4	6.0872e-4	5.3040e-5
Cr-50 (24050)	7.0953e-3	7.8545e-3	6.8440e-4
Cr-52 (24052)	1.4229e-1	1.5147e-1	1.3198e-2
Cr-53 (24053)	1.6445e-2	1.7175e-2	1.4965e-3
Cr-54 (24054)	4.1707e-3	4.2752e-3	3.7252e-4
Ni-58 (28058)	8.0637e-2	7.6956e-2	6.7055e-3
Ni-60 (28060)	3.2131e-2	2.9643e-2	2.5830e-3
Ni-61 (28061)	1.4200e-3	1.2886e-3	1.1228e-4
Ni-62 (28062)	4.6019e-3	4.1087e-3	3.5800e-4
Ni-64 (28064)	1.2097e-3	1.0462e-3	9.1161e-5
Mo-92 (42092)	3.4794e-3	2.0932e-3	1.8239e-4
Mo-94 (42094)	2.2387e-3	1.3182e-3	1.1486e-4
Mo-95 (42095)	3.9169e-3	2.2819e-3	1.9883e-4
Mo-96 (42096)	4.1655e-3	2.4015e-3	2.0925e-4
Mo-97 (42097)	2.4239e-3	1.3830e-3	1.2051e-4
Mo-98 (42098)	6.2218e-3	3.5136e-3	3.0616e-4
Mo-100 (42100)	2.5563e-3	1.4147e-3	1.2327e-4
Fe-54 (26054)	3.6891e-2	3.7815e-2	3.2950e-3
Fe-56 (26056)	6.0053e-1	5.9361e-1	5.1724e-2
Fe-57 (26057)	1.4117e-2	1.3709e-2	1.1945e-3
Fe-58 (26058)	1.9116e-3	1.8244e-3	1.5897e-4

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.

Generated material cards

MCNP

c Stainless Steel 316
c PNNL-15870 Rev. 2, "Steel, Stainless 316" - reactormc.net/nrdp/material/ss316;
c rho = 8 g/cm3 (use -8 on the cell card)
m12    6000.80c  -8.0000e-4  $ C
       25055.80c  -0.020000  $ Mn55
       15031.80c  -4.5000e-4  $ P31
       16032.80c  -2.8412e-4  $ S32
       16033.80c  -2.3134e-6  $ S33
       16034.80c  -1.3506e-5  $ S34
       16036.80c  -3.3648e-8  $ S36
       14028.80c  -0.009187  $ Si28
       14029.80c  -4.8337e-4  $ Si29
       14030.80c  -3.2999e-4  $ Si30
       24050.80c  -0.007095  $ Cr50
       24052.80c  -0.142289  $ Cr52
       24053.80c  -0.016445  $ Cr53
       24054.80c  -0.004171  $ Cr54
       28058.80c  -0.080637  $ Ni58
       28060.80c  -0.032131  $ Ni60
       28061.80c  -0.001420  $ Ni61
       28062.80c  -0.004602  $ Ni62
       28064.80c  -0.001210  $ Ni64
       42092.80c  -0.003479  $ Mo92
       42094.80c  -0.002239  $ Mo94
       42095.80c  -0.003917  $ Mo95
       42096.80c  -0.004166  $ Mo96
       42097.80c  -0.002424  $ Mo97
       42098.80c  -0.006222  $ Mo98
       42100.80c  -0.002556  $ Mo100
       26054.80c  -0.036891  $ Fe54
       26056.80c  -0.600532  $ Fe56
       26057.80c  -0.014117  $ Fe57
       26058.80c  -0.001912  $ Fe58

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 2.5 wt% molybdenum is what separates 316 from 304.

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