A Discussion of SY-101 Crust Gas Retention and Release Mechanisms

Tank 241SY101 Safety Basis for Remediation Activities and Operations Before Closure of the Unreviewed Safety Question (USQ) on Waste Surface Change

“…The initial crust thickness was set to -4.6 cm (1.8 in.) or about 1/40" the thickness of the actual SY-101 crust (-72 in., Rassat et al 1999). The experimental crust-release hole diameter is equal to the initial crust thickness (-4.6 cm) and is, therefore, equivalent to a hole in the SY-101 crust of 6 ft or more.…”

Process Control Plan for Tank 241-SY-101 Surface Level Rise Remediation

“…Within the last year or so, the waste in this tank has exhibited unexpected behavior (Rassat et al 1999) in the form of rapidly increasing crust growth. This growth has been brought about by a rapidly increasing rate of gas entrapment within the crust.…”

Design review report for the SY-101 RAPID mitigation system

“…Within the last year or so, the waste in this tank has exhibited both unexpected and exlreme behavior (Rassat et al 1999) in the form of rapidly increasing crust growth. This growth has been brought about by a rapidly increasing rate of gas entrapment within the crust..…”