Corrosion monitoring of storage bins for radioactive calcines Page: 11 of 21
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VII CONCLUSIONS
1. A corrosion allowance independent of the thickness requirements
for structural and abnormal stress must be specified as a part of the design
criteria for the construction of future solids storage bins. Based upon
data from the corrosion coupons that were withdrawn from the zirconium
calcine storage bin, corrosion allowances for Types 304L, 304, 405, and
AISI 1025 carbon steel at 95 percent confidence level assuring a projected
500 year service life, are 5-, 7-, 40-, and 50- mils, respectively. Accordingly,
with these corrosion allowances, any of these alloys would be suitable for
storage of zirconium calcine.
2. Based upon data on corrosion coupons that were withdrawn from
bins that contained aluminum calcine solids, corrosion allowances to provide
the required 500 year life are 1-, 1-, 7- and 12-mils for Types 304L, 304,
405, and AISI 1025 carbon steel, respectively. Thus, each of these alloys
is suited for aluminum calcine product storage service.
3. For a proposed service life of 500 years, the existing ICPP Type 304
(0.06 percent carbon maximum) stainless steel bins for storage of dry aluminum
and/or zirconium calcine solids will not exceed, at 95% confidence level, a
metal loss of 5 2 mils.
4. Owing to the very low observed corrosion rates, a revised schedule
for withdrawing corrosion coupons from the storage bins to reflect observations
nearing the 500 year terminal service life of these bins is recommended.
Accordingly, one cable from each bin should be withdrawn at the end of the
10th, 100th, 250th, and 450th year of solid storage service.
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Hoffman, T.L. Corrosion monitoring of storage bins for radioactive calcines, article, January 1, 1975; United States. (https://digital.library.unt.edu/ark:/67531/metadc871396/m1/11/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.