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01120 RESULTS OF VARIOUS TESTS ON WELDED AND UNWELDED ALLOY 59 FOR RAD-WASTE CONTAINERS

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Product Number: 51300-01120-SG
ISBN: 01120 2001 CP
Author: D.C. Agarwal, U. Brill, and Richard A. Corbett
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The Nuclear Waste Policy Act of 1982 established an objective of Nuclear Waste disposal in a deep geological repositary. This act was later amended in 1987, and established Nevada as the only site to be characterized. In 1994 a technical decision was made for a multipurpose container consisting of a outer barrier of carbon steel, alloy 400 or Cu-Ni 70/30 and an inner barrier of alloy 825. This concept was later modified to require a more corrosion resistant alloy for the inner barrier i.e., an alloy of the Ni-Cr-Mo family, alloy 22 ( UNS N06022), titanium or a titanium alloy. Since then many papers have been written comparing the corrosion resistant characteristics of alloys 825, 625, C-276 and alloy 22. The design waste package underwent several iterations with one of the latest design called" Enhanced Design Alternative" (EDA) which will consist of 20 mm thick alloy 22 as the outer container barrier. This will be shrunk fit to a 50mm thick inner barrier fabricated of type 316 nuclear grade or standard 316L SS. This waste package was then to be enclosed by a self-supported 20 mm thick Ti-grade-7 mailbox shaped drip shield. In the authors' opinion this design may be further modified as more comprehensive corrosion characteristics of uniform corrosion, localized corrosion, stress corrosion cracking, thermal stability, microbiological corrosion, galvanic corrosion, intergranular corrosion for both the base metal and more importantly, the weld joints in these waste containers under realistic repository environments are obtained. This paper presents data on a new but well established corrosion resistant alloy 59 ( UNS N06059) of the Ni-Cr-Mo family. Alloy 59 appears to have better corrosion resistance, both uniform and localized, and better thermal stability than alloy 22 as measured in standard ASTM laboratory tests. Data from some of these laboratory tests on alloy 59 and 22 along with the various interactions with Lawrence Livermore National Laboratories and the TRW Environmental Safety Systems, Management and Operating Contractor for the waste package design, are discussed. Key words: crevice corrosion, Yuccaa Mountain Project, rad-waste containers, alloy 22, UNS N06022, alloy 59, UNS N06059, nuclear waste
The Nuclear Waste Policy Act of 1982 established an objective of Nuclear Waste disposal in a deep geological repositary. This act was later amended in 1987, and established Nevada as the only site to be characterized. In 1994 a technical decision was made for a multipurpose container consisting of a outer barrier of carbon steel, alloy 400 or Cu-Ni 70/30 and an inner barrier of alloy 825. This concept was later modified to require a more corrosion resistant alloy for the inner barrier i.e., an alloy of the Ni-Cr-Mo family, alloy 22 ( UNS N06022), titanium or a titanium alloy. Since then many papers have been written comparing the corrosion resistant characteristics of alloys 825, 625, C-276 and alloy 22. The design waste package underwent several iterations with one of the latest design called" Enhanced Design Alternative" (EDA) which will consist of 20 mm thick alloy 22 as the outer container barrier. This will be shrunk fit to a 50mm thick inner barrier fabricated of type 316 nuclear grade or standard 316L SS. This waste package was then to be enclosed by a self-supported 20 mm thick Ti-grade-7 mailbox shaped drip shield. In the authors' opinion this design may be further modified as more comprehensive corrosion characteristics of uniform corrosion, localized corrosion, stress corrosion cracking, thermal stability, microbiological corrosion, galvanic corrosion, intergranular corrosion for both the base metal and more importantly, the weld joints in these waste containers under realistic repository environments are obtained. This paper presents data on a new but well established corrosion resistant alloy 59 ( UNS N06059) of the Ni-Cr-Mo family. Alloy 59 appears to have better corrosion resistance, both uniform and localized, and better thermal stability than alloy 22 as measured in standard ASTM laboratory tests. Data from some of these laboratory tests on alloy 59 and 22 along with the various interactions with Lawrence Livermore National Laboratories and the TRW Environmental Safety Systems, Management and Operating Contractor for the waste package design, are discussed. Key words: crevice corrosion, Yuccaa Mountain Project, rad-waste containers, alloy 22, UNS N06022, alloy 59, UNS N06059, nuclear waste
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