ITER G A0 FDR 1 01-07-13 R1.0The atmosphere detritiation systems, HVACs <strong>and</strong> containment volume air cooler equipmentare located in the tritium building. The condensate of the equipment is sent to the tritiatedwater holding tank systems in the tritium building.<strong>Tritium</strong> Building Confinement <strong>and</strong> <strong>Detritiation</strong> SystemsThe confinement <strong>and</strong> detritiation systems for the tritium building are composed of tritiumprocess equipment (primary barrier), enclosures such as glove boxes (secondary barrier), <strong>and</strong>tritium process rooms (final barrier). The secondary confinement is implemented by theglove box atmosphere detritiation system <strong>and</strong>/or the dry N 2 gas purge to the normal ventdetritiation system. The tritium process rooms are backed up by the tritium building HVACs,the normal vent detritiation system (500 m 3 /h) <strong>and</strong> the st<strong>and</strong>by atmosphere detritiationsystem.Figure <strong>3.1</strong>-4 shows the concept of the confinement <strong>and</strong> detritiation system configuration forthe tritium building. It also shows the interface with the ADS <strong>and</strong> VDS units for the tokamakbuilding. The dotted lines indicate the possibility to connect the vault volume to the S-ADS<strong>and</strong> S-VDS. The HVAC is composed of a white zone HVAC <strong>and</strong> two green zone HVACs,i.e. one for the water detritiation system room <strong>and</strong> tritiated water holding tank rooms, anotherone for other tritium processing subsystems rooms. During normal conditions, the roomatmosphere pressure in the green zone is maintained at - 1 mbar differential by the HVAC.When the room air tritium concentration exceeds a set point, the relevant room isolationvalves in the HVAC are closed, <strong>and</strong> triggers cause the isolation valves connected to thenormal vent detritiation system to open.In the case that large room areas are contaminated simultaneously, the st<strong>and</strong>by ventdetritiation system (3,000 m 3 /h) will be operated with a required flow rate. The st<strong>and</strong>by ventdetritiation system can be switched to three main areas, i.e. the tokamak building gallery area,the containment volume, <strong>and</strong> the tritium building green zone areas. The st<strong>and</strong>by atmospheredetritiation system (4,500 m 3 /h) is operated to enhance decontamination of the contaminatedrooms to ensure early entry to reestablish normal conditions.In addition, the normal vent detritiation system (throughput 500 m 3 /h) receives variousexhaust gases from different sources depending on their operation modes, maintenanceschedule <strong>and</strong> their off-normal conditions. The normal vent detritiation system has a st<strong>and</strong>bycapacity (~ 200 – 300 m 3 /h) to meet such intermittent gas sources.Figure <strong>3.1</strong>-5 shows the concept of an integrated atmosphere detritiation for both the tokamak<strong>and</strong> tritium buildings. The equipment of all atmosphere detritiation systems is located in thetritium building. Figure <strong>3.1</strong>-6 shows an integral configuration of the glove box atmospheredetritiation system (throughput 150 m 3 /h) <strong>and</strong> glove boxes. All glove boxes are purified byre-circulating the atmospheric gas (N 2 ) through the glove box atmosphere detritiation systemduring normal conditions. In case the tritium concentration in one of the glove boxes exceedsa set point (1 mCi/m 3 ) due to a failure of equipment or process piping, other glove boxes areisolated from the glove box atmosphere detritiation system gas circulation loop, <strong>and</strong> the fullglove box atmosphere detritiation system capacity, is dedicated to the contaminated glovebox for enhanced detritiation. Even if the maximum tritium inventory of 100 g in the tritiumstorage bed is instantaneously spilled in a representative glove box (volume 30 m 3 ), 99.9 %<strong>Plant</strong> Description Document Chapter <strong>3.1</strong> Page 12
ITER G A0 FDR 1 01-07-13 R1.0recovery is achieved in a few hours. The resulting tritium permeation into the room throughthe gloves will be less than a few Ci, <strong>and</strong> retained by the normal vent detritiation system.<strong>Plant</strong> Exhaust FacilityUpper Port CellsN-VDS 2Equator Port CellsLower Port CellsS-VDSTokamak BuildingN-VDS 1S-ADS<strong>Tritium</strong> Process EffluentsVacuum Pumping Systems EffluentsFuelling Systems Purge GasGlovebox, Secondary Ernclosure Purge GasTritiated Water Holding Tank Purge GasHVAC-ILocal AirCoolerHVAC-IILocal AirCoolerNon <strong>Tritium</strong> ProcessRoomsTCWS EffluentTVS EffluentRoom Pressure ControlP/FH/CP/FH/CH/CH/FC/CH/FC/CC/CP/FP/FP/FExhaustFresh Air ExhaustFresh Air ExhaustFresh AirP/FH/FPre Filter C/C Cooling Coil Butterfly valveHEPA FilterH/CHeating Coil Glove valve (Normal Open)Glove valve (Normal Close)Process line (Normal Operation)Process line (St<strong>and</strong>by)Figure <strong>3.1</strong>-4Concept of Confinement <strong>and</strong> <strong>Detritiation</strong> System Configurationfor the <strong>Tritium</strong> Building<strong>Plant</strong> Description Document Chapter <strong>3.1</strong> Page 13
Change language