Evacuated tubes safety

The checkers report that it is not necessary to use thick-walled tubing. The reaction can be initiated in well-evacuated tubing of ordinary thickness with perfect safety by means of a hand torch, provided part of the tube is left cool enough for condensation if the initial reaction becomes too vigorous. 

Unpack Area (UPA) ACAMS - 203 alanned at maximum reading of 508 TWA and the local ACAMS displayed 2080 TWA. UPA workers were evacuated and monitored out using ACAMS. Blood draws were performed on all potentially exposed workers. Blood draws on workers in dicated no depression of CHE. Once the ACAMS level dropped below the level of quantification. Monitoring Personnel went into the UPA to challenge ACAMS-203 and puU DAAMS tubes. ACAMS-203 alarmed at 0.29 TWA while personnel were in level C protective equipment. DAAMS tubes confirmed for GB Agent at 0.54 TWA. A safety investigation conducted. 

Redundant 28 cfm vacuum pumps located in the Zone. 1 filter room of the MER, shown in Figure 2.5-10, evacuate a 80-gallon (10.7-cubic feet) tank to supply system vacuum. The pumps are configured to automatically start to maintain system vacuum at a prescribed level. The exhaust from the pumps is routed into the Zone 1 exhaust upstream of the Zone 1 charcoal filters. Two-inch welded stainless steel piping is routed from the vacuum tank in the MER through the overhead in Rooms 112 and 111 into the Zone 2A canyon. In the canyon, the vacuum line is routed to a cold trap that will condense radioactive effluents that are drawn into the vacuum system. Two-inch welded stainless steel tubing is used to route process vacuum to each SCB. While the pumps themselves are not identified as important to safety, the routing of the pump exhaust to the Zone 1 exhaust is so identified, because it assures appropriate filtration of the effluent in the event that hazardous constituents are drawn into the system. 

The remaining measuring channels, located in a second chassis, measure radiation levels associated with operating specific experimental facilities. These channels are not required by Technical Specifications, but are described in the Safety Analysis Report. Each beam port has an associated radiation monitor channel, with the detector located on the Reactor Laboratory walls in line with the radiation beam that would be emitted if the beam ports were operated with plugs and external shields removed. A fifth channel detector is located beside the pneumatic tube send-receive station in room 43. This channel has a remote indicator, which provides both dose rate readout and alarm on high radiation level. All five of these detectors annunciate via the EXPERIMENTAL FACILITY RADIATION LEVEL HIGH annunciator when high alarm setpoints are exceeded. These are not connected to the external evacuation alarm. 

End state ICFEj to ICFE4 means different degrees of insufficient conditions for evacuation. End state OK means the system works as planed and safety is secured when fire in one of the two tunnel tubes occurs. 

---