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This rule would clarify the use of entombment for power reactors.  The NRC had determined that entombment of power reactors was a technically viable decommissioning alternative and could be accomplished safely. An advance notice of proposed rulemaking (ANPRM) was published seeking stakeholder input on three proposed regulatory options and whether entombment was a viable decommissioning alternative. In SECY 02-0191 (October 25, 2002), NRC staff proposed deferring the rulemaking until the Office of Nuclear Regulatory Research completed research to develop a sound technical basis for an entombment option. The Office of Nuclear Regulatory Research conducted research in 2004 and 2005, and the work was terminated in FY 2005, at the direction of the Commission. A research information letter was prepared summarizing the research results and regulatory implications of using concrete barriers to prevent or control the release of radioactive materials from waste disposal facilities or contaminated sites.  The Commission has discontinued action on this rulemaking.