Corrosion behaviour of steel CSN 422707.9 in concentrated synthetic bentonite pore water

Novikova, D P; Kouřil, Milan; Msallamová, Šárka; Stoulil, J.; Strnadová, Nina

doi:10.1515/kom-2016-0011

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…Preliminary studies of the corrosion behaviour of the potential canister materials were performed employing synthetic de-aerated bentonite pore water [3,18]. Testing focused on the prospective elevation of a chloride and sulphate concentration as a result of water evaporation on the heated surface of a canister.…”

Section: Czech Disposal Canister Concept and Current Stage With Regarmentioning

confidence: 99%

Czech national programme and disposal canister concept

Pospiskova

Dobrev

Kouřil

et al. 2017

Corrosion Engineering, Science and Technology

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The Czech Republic has a well-developed nuclear programme with two nuclear power plants currently in operation and three operational near-surface repositories serving for the disposal of institutional and operational low-and intermediate-level waste. Spent nuclear fuel will be disposed of in a deep geological repository to be constructed in crystalline or metamorphic rock approximately 500 m below the surface. Czech Ca-Mg bentonites will be used as the buffer and backfilling material. Steel-based materials are currently considered as the reference metallic materials in the Czech disposal canister concept. The preferred design is based on a doublewalled canister with an inner shell of stainless steel and an outer shell of carbon-steel. Both parts of the canister must provide mechanical stability; the wall of the carbon-steel canister will be strengthened for corrosion-resistance purposes. The presented work focuses on canister design as confirmed by means of mechanical, thermal and criticality calculations and a detailed experimental corrosion plan.

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Section: Czech Disposal Canister Concept and Current Stage With Regarmentioning

confidence: 99%

Czech national programme and disposal canister concept

Pospiskova

Dobrev

Kouřil

et al. 2017

Corrosion Engineering, Science and Technology

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“…The Czech concept [1][2][3][4][5][6][7][8] of a HLW canister for deep geological repository considers three combinations of metallic material inner/outer case:…”

Section: Introductionmentioning

confidence: 99%

Localised Corrosion of Stainless Steels 316l and 2205 in Synthetic Bentonite Pore Water and Bentonite Slurry

Stoulil¹,

Павлова²,

Kouřil³

2021

Acta Metall Slovaca

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One concept for Czech canister construction for deep geological repository considers stainless steel as an inner case material. Corrosion resistance to localised (pitting/crevice) corrosion and stress corrosion cracking of austenitic stainless steel 316L and duplex steel 2205 was studied. The environment was synthetic bentonite pore water (SBPOW) of domestic bentonite BaM, or a slurry of bentonite in SBPOW. Tests were carried out between 40 °C and 90 °C under anaerobic conditions of a nitrogen atmosphere. The following methods were used for evaluation: potentiostatic tests at oxidation-reduction potential of the environment, long-term exposure tests in SBPOW and slurry, slow strain rate tensile test (SSRT), exposure test of U-bends, and optical microscopy. Results showed no susceptibility of either material to stress corrosion cracking. No localised corrosion was observed up to 70 °C. There was no localised attack observed in SBPOW at 90 °C, but there was localised corrosion detected in the bentonite slurry. Forced breakdown of the passive layer during SSRT, and artificial crevices (O-rings), showed no effect on localised corrosion propagation. The detrimental effect was probably a result of the adsorption ability of the bentonite particles, which allowed breakdown of passive layer and disabled repassivation of metastable pits.

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