Investigation of Soil Corrosivity Effect on Low Radioactive Wastes Burial Casks

Forati Rad, H; Mohajerani, H. R; Nejat Pishkenari, M; Maleki Faresani, A; Momenzade, S; Rostam Nejad, M; Asadian, M

Investigation of Soil Corrosivity Effect on Low Radioactive Wastes Burial Casks

Document Type : Research Paper

Authors

H Forati Rad

H. R Mohajerani

M Nejat Pishkenari

A Maleki Faresani

S Momenzade

M Rostam Nejad

M Asadian

Abstract

In this study, corrosion of AISI st37 steel waste casks was investigated by analyzing the physico-chemical characteristics of the soil medium. The chemical composition of soil has important effects on steel casks. Moisture, soil electrical resistivity, soluble salts, chlorides, pH, redox potential and anions and cations content, as the major parameters, influence the exterior corrosion of waste casks. To carry out this research, the corrosivity of the soil in the central desert regions of Iran has been studied using the AWWA C105 standard. In these regions, 4 samples have been collected at varied points located in the vicinity of the site, named CR1, CR2, CR3 and CR4. At first, for a better assessment of the soils corrosivity, the physical and chemical analyses were conducted on the soil and in the solutions prepared from the soil samples. Then, the rate of corrosion was measured by the weight loss and potentiodynamic polarization methods. The obtained results showed that the CR4 soil sample with the lowest electrical conductivity, compared with the other samples, has the lower corrosion rate in the whole method. Corrosion rates of the samples in this region in the 180-day weight loss method, and in the electrochemical method are equal to 0.0625 and 0.029 mm/y, respectively.

Keywords

Waste Container Corrosion

Physico-Chemical Characteristics

Soil Electrical Conductivity

Weight Loss

Potentiodynamic Polarization

20.1001.1.17351871.1395.37.2.4.7

[1] W.F. Holcomb, A Survey of Packaging for Solidified Low-Level Radioactive Waste, Ohio Press, (1978).

[2] E. Levlin, Corrosion of Water Pipe Systems due to Acidification of soil and Groundwater, Royal Institute of Technology, Englnd, Ph.D. thesis, (1992).

[3] R.L. Starkey, K.M. Wight, Anaerobic Corrosion of Iron in soil, Am. Gas Ass. Bull. 17 (1983), 11-13.

[4] E. Schaschle, G.A. Marsh, Some New Views on Soil Corrosion, Mat. Protect. 2 (1963) 8-17.

[5] P.L. Piciulo, C.E. Shea, R.E. Barletta, Analyses of Soils at Commercial Radioactive-Waste-Disposal Sites, Corro. Sci. 45 (1993) 45-56.

[6] ANSI/AWWA, C105/A21.5, American National Standard for Polyethylene Encasement for Ductile-Iron Pipe Systems, (2005).

[7] R. Mahmudi, B. Dehghan-Manshadi, H. Mahmudi, A. Abedian, A novel method for materials selection in mechanical design: Combination of non-linear normalization and a modified digital logic method, Mat. Des. 28 (2007) 8–15.

[8] NACE/ASTM TM0169, Standard Guide for Laboratory Immersion Corrosion Testing of Metals, Edition, ISBN: 1-57590-098, (2012).

[9] ASTM G59, Standard Test Method for Conducting Potentiodynamic Polarization Resistance Measurements, (2014).

[10] A. Etor, Electrochemical Measurement of Crevice Corrosion of Type AISI 304 Stainless Steel, A Thesis Submitted to the College of Graduate Studies and Research in Partial Fulfillment of the Requirements for the Master of Science in the Department of Chemical Engineering University of Saskatchewan Saskatoon, (2001).

[11] A. Samouelian, I. Cousin, A. Tabbagh, A. Bruand, G. Richard, Electrical resistiity survey in soil science: a review, Soi. Till. Res. 83 (2005) 173-193.

[12] M. Fukue, T. Inoue, Y. Fujimori, K. Tanabe, K. Kita, T. Chida, A. Nishihara, Resistivity change during transport of heavy metal in sand, Eng. Geo. 85 (2006) 46-52.

[13] A. Benmoussat, M. Hadjel, Corrosion behavior of low carbon line pipe steel in soil Environment, Corr. Sci. Env. 7 (2005) 23-28.

[14] BS 1377, Methods of test for soils for civil engineering purposes. General requirements and sample preparation, (1990).

[15] ASTM D2216, Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass, (1996).

[16] ASTM G51, Standard Test Method for Measuring pH of Soil for Use in Corrosion Testing, (2012).

[17] Islamic Republic of Iran Vice Presidency for Planning and Supervision, Guidelines for Laboratory Analysis of Soil and Water Samples, No.467, (1995).

[18] ASTM D422, Standard Test Method for Particle-Size Analysis of Soils, (2007).

[19] ASTM G102, Standard Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements, (2010).

[20] R. Rukeh, A. Kpofure, A. Watefe, J. Kehinde, Investigation of soil corrosivity in the corrosion of low carbon steel pipe in soil environment, App. Sci. Res. 2 (2006) 466-469.