Alarms, centrifuges

Blockage of liquid Monitor pressure drop across vent system (e.g., effluent line due local indication, alarm or interlock) to closed valves,, Interlock valve in feed line to centrifuge results in flooding of basket and Equipment/line-up checks overflow from Remove unnecessary valves basket to solid col-. 5, lection system in base. Possibility of liquid spill. ... 

Two 50-ml plastic centrifuge tubes containing 10-ml solution were transported between rooms without secondary containment. No Lab personnel were in room at time of the ACAMS alarm. 

Excess feed can happen with centrifugal pumps hence provide variable-frequency drive motor and low/high SO2 % alarms for gas composition and furnace exit gas temperature f it is not possible to provide metering pumps. 

In most cases, it is normal to maintain a uniform acid feed for the desired output level and to control the ammonia addition to achieve a steady pH of 8.0. The control system should include an audible alarm and provisions for shutting off the acid if the pH faDs below 7.0 otherwise, those components in the system not protected by rubber or plastic linings (e.g., the centrifuge) would be quickly damaged by corrosion. Slurry is withdrawn from the saturator at about 80% solids concentration, and the ammonium chloride crystals are separated and rinsed in stainless-steel centrifuges. In some cases, drying is... 

The continuous enrichment monitor (CEMO) monitors the absence of HEU production in selected gaseous centrifuge facilities and delivers qualitative Go-No-Go information to the inspectorate (Packer 1991 Packer et al. 1997). The CEMO determines the content of U-235 from the intensity of the 186 keV peak using Nal detectors fixed on the product header pipes and correlating the pressure of the gaseous UFs with a transmission measurement (radioactive X-ray transmission source ° Cd ( 20-50 keV)). The enrichment is then calculated based on these two parameters. The system operates continuously and transmits remotely (twice a day) state of health and alarm messages in the event that LEU is not confirmed or when a system fault occurs. 

Due to the progress in technology and development of intensive fuel reprocessing methods, applying centrifugal extractor batteries, there is a strong demand for the method to observe closely some process facilities from the criticality point of view. This paper presents experiments with on-line, anomalous reactivity prediction of spme facilities, providing alarm and possible plant protection functions. 

As an example, a t5q>ical basket centrifuge installation requiring a nitrogen blanketing system would need the following alarms and shutdowns ... 

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