Open AccessDefinition and means of maintaining the process vacuum liquid detection interlock systems portion of the PFP safety envelope
Author(s) -
R.J. Thomas
Publication year - 1999
Language(s) - English
Resource type - Reports
DOI - 10.2172/798079
Subject(s) - interlock , nuclear engineering , glovebox , detector , level sensor , materials science , engineering , electrical engineering , mechanical engineering
The HC-4, HC-7, HC-227s and the tank 50 High Level Liquid detection interlock systems detect the potential for a liquid up take into the 26 inch Vacuum Headers. All of the detectors are well upstream of the 26 inch Vacuum Liquid Detection system that is designed to prevent a criticality due to liquid uptake. Failure of any of the four glovebox liquid detection systems would not impact the operation of the 26 inch Vacuum Liquid Detection system. The systems are completely separate. The liquid detectors and interlocks were installed after an incident in HC-227s resulted in a significant volume of RMC feed grade plutonium solution to be drawn out of the glovebox and into the vacuum header. The vacuum trap liquid detection interlock system operability is verified by a weekly functional test per maintenance procedure 2222124. Removal of the HC-7 Liquid Detection Interlock system from the WHC-SD-CP-SDD-013 document will not impact this maintenance procedure