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This report provides a description of the ultrasonic (UT) nondestructive examinations (NDE) and the results of the examinations, performed on high level waste (HLW) storage tank number 15 at the Savannah River Site. These inspections were performed in accordance with the ''In-Service Inspection (ISI) Program for High Level Waste Tanks'' (i) The ISI Program for HLW Tanks was developed using the ''Guidelines for Tank Structural Integrity Programs'' for waste tank in-service inspection programs (ii) as a guide. The inspections were performed from the contaminated, annular space of the 46 year old, inactive, 1.03 million gallon waste storage tank. A steerable, magnetic wheel wall crawler was used to simultaneously collect data with up to 4 UT transducers and 2 cameras. The purpose of this inspection was to verify known corrosion models and to investigate the possibility of previously unidentified corrosion mechanisms. The inspections included evaluation of previously identified leak sites as well as thickness mapping and crack detection scans on specified areas of the tank covering welds and all past and present interface levels. No indications of reportable wall loss or pitting were detected. All thickness readings were above minimum design thickness. Several small indications of thinning were detected. The crack detection and sizing examinations detected five previously undetected indications, four of which were only partially through wall. The cracks that were examined were found to be slightly longer than expected, but are still well within the critical flaw size criteria. The HLW ISI Review Committee requested the Materials Performance and Corrosion Technology group of Savannah River Technology Center (SRTC) to evaluate the structural impact of these findings. The results of these evaluations are reported in WSRC-TR-2002-00590

SRS Type II HLW Tank 15 NDE Inspection Results