Hydrogen-Induced Cracking of the Drip Shield

Technical Report · Tue Sep 07 00:00:00 EDT 2004

DOI:https://doi.org/10.2172/839517· OSTI ID:839517

Hua, F

Hydrogen-induced cracking is characterized by the decreased ductility and fracture toughness of a material due to the absorption of atomic hydrogen in the metal crystal lattice. Corrosion is the source of hydrogen generation. For the current design of the engineered barrier without backfill, hydrogen-induced cracking may be a concern because the titanium drip shield can be galvanically coupled to rock bolts (or wire mesh), which may fall onto the drip shield, thereby creating conditions for hydrogen production by electrochemical reaction. The purpose of this report is to analyze whether the drip shield will fail by hydrogen-induced cracking under repository conditions within 10,000 years after emplacement. Hydrogen-induced cracking is a scenario of premature failure of the drip shield. This report develops a realistic model to assess the form of hydrogen-induced cracking degradation of the drip shield under the hydrogen-induced cracking. The scope of this work covers the evaluation of hydrogen absorbed due to general corrosion and galvanic coupling to less noble metals (e.g., Stainless Steel Type 316 and carbon steels) under the repository conditions during the 10,000-year regulatory period after emplacement and whether the absorbed hydrogen content will exceed the critical hydrogen concentration value, above which the hydrogen-induced cracking is assumed to occur. This report also provides the basis for excluding the features, events, and processes (FEPs) related to hydrogen-induced cracking of the drip shield with particular emphasis on FEP 2.1.03.04.OB, hydride cracking of drip shields (DTN: M00407SEPFEPLA.000 [DIRS 170760]). This report is prepared according to ''Technical Work Plan (TWP) for: Regulatory Integration Modeling and Analysis of the Waste Form and Waste Package'' (BSC 2004 [DIRS 169944]).

• Research Organization: Yucca Mountain Project, Las Vegas, NV (United States)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC28-01RW12101
• OSTI ID: 839517
• Report Number(s): ANL-EBS-MD-000006, REV 02; DOC.20041028.0009, DC35909; TRN: US0503049
• Resource Relation: Other Information: PBD: 7 Sep 2004
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
36 MATERIALS SCIENCE
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ABSORPTION
CARBON STEELS
CORROSION
CRYSTAL LATTICES
DUCTILITY
FASTENERS
FRACTURE PROPERTIES
HYDRIDES
HYDROGEN
HYDROGEN PRODUCTION
POSITIONING
SHIELDS
SIMULATION
STAINLESS STEELS
TITANIUM
WASTE FORMS
WASTES