Advanced Scale Conditioning Agent and Consolidated Deposit Extraction Planning, Application Experience, and Results at Comanche Peak Unit 2 and Industrial Super Critical Water Oxidation Waste Reduction

Abstract

Advance Scale Conditioning Agent (ASCA) technology has been applied more than forty times worldwide since its inception in 2000. This technology has continually grown in popularity since its development due to the combination of several process benefits and minimal outage impacts.

Comanche Peak Unit 2 applied a Top of Tubesheet (TTS) ASCA in 2014 for partial dissolution and softening of consolidated TTS collars. In addition to the ASCA application, a Consolidated Deposit Extraction (CODE) step was applied to the TTS. CODE is a chemical treatment technology that effectively targets and dissolves “binding species” such as those containing aluminum and silicon from steam generator deposits. Since magnetite dissolution technologies are not wholly effective in removing consolidated TTS “collars,” CODE technology was developed to address this need in the industry.

This paper will discuss both the Westinghouse and utility perspective on TTS ASCA/CODE application planning, site execution, and process results.