Analysis of process-monitoring data bases for low-level-waste processing

West Valley Nuclear Services (WVNS) Company developed the integrated radwaste treatment system (IRTS) to remotely process and store existing PUREX (plutonium uranium reduction extraction) wastes in a stabilized form. The IRTS utilizes four major subsystems in its processing of the waste. Initial mobilization of the waste and removal of cesium is performed by the supernatant treatment system. The decontaminated supernate is then volume reduced by the liquid waste treatment system. Stabilization of the waste is accomplished in the cement solidification system (CSS), where it is combined with cement and various other additives and processed into 71-gal drums. The processed drums are then transported to the drum cell, where they are remotely stacked and stored. To verify compliance of the final product, WVNS quality assurance personnel developed a comprehensive program for monitoring all low-level-waste production activities. An integral portion of this program validates, verifies, and analyzes the process data acquisition systems (DASs). Results obtained in initial operations have found various anomalies inherent in the gathering of process records. Errors denoted were attributed to the DASs, operation, and the process control plan. The changes made continue to make marked improvements in the accuracy and completeness of the CSS and drum cell documentation.