There has always been tritium in our environment. It is naturally formed in the uper levels of the atmosphere and falls down on the earth as rain. However, the development of human activities leading to tritium production, can represent a risk for human health. Tritium has a low radio-toxicity. The admissible derived concentration limit for a human being in contact with tritium is 8.105 Bq.m-3 for water and 1.1010 Bq.m-3 for gas. Thus, it is essential to continuously check that our nuclear equipments are properly functionning by monitoring tritium in all places where it is released in the environment (weapon industry, nuclear power plants, ...).
The MARC 7000 equipment is designed to sample the tritium which is contained in a volume of air (gas H3, tritiated water HTO or organically combined). Tritiated water vapor is trapped in the first two feeding bottles by means of the bubbling principle. To trap the tritium which is combined to organic materials, an oxidation reaction is created in the oven. A catalyser is used to lower the combustion level. This causes tritium to react chemically to form tritiated water vapor which is trapped in feeding bottles n°3 & 4. After a certain time, the tritiated water contained in the bottles is measured in a laboratory. The quantity of tritium measured is related to the volume of air which has passed through the equipment.
Quality norm
IN COMPLIANCE WITH THE NF M60-312 NORM
Key Advantages
1. EXCELLENT TRAPPING EFFICIENCY (close to 99%).
2. COOLING SYSTEM TO INCREASE SAMPLING LENGTH (option).
3. GOOD PRICE.
4. CONSTANT EVOLUTION OF THE PRODUCT.
5. EASY TO USE.
6. CONNECTABLE TO ALL SAMPLING LINES.
TESTS & RESULTS
|
TEST
|
RESULTS
|
| Repeatability and accuracy AIRFLOW |
Repeatibility : ±0,8% Accuracy : ±1% |
| Repeatability and accuracy of oxidizing oven temperature |
According to specifications given in technical performances |
| Gas TRITIUM trapping |
Trapping efficiency > 95 % |
| Tritiated water trapping |
Trapping efficiency > 95 % |
| Tritiated water vapour trapping with collector half filled (feeding-bottle) |
Minimum trapping efficiency >0,97 |
| Other radioactive gas RESPONSE |
No influence |
| Cooling system efficiency |
Room temperature =+20°C
Water temp. in feeding-bottle= +5°C
Room temperature =+45°C
Water temp. in feeding-bottle=+15°C |
ELECTRICAL SPECIFICATIONS
Voltage requirement : 220 Volts. (±10%).
Power consumption : 300 Watts (700 Watts, with cooling system option).
Frequency voltage: 50 Hz (±10%).
Running fully piloted by microprocessor :
Airflow (10 to 55 liters/hour) and detection of tightness defect of bottles.
Heap of gases posted by the machine (until 25,000 m3).
Temperature of oxidizing oven : (+ 200°C to + 500° C).
Cooling system : +5°C to +15°C (depending on the ambient temperature).
Circulation of the cold liquid : automatic error detection.
Circulation pump of the cold liquid (functioning).
Alarm Buzzer for all defects detected.
Electrical output by : RS 232. (J.BUS system optional).
Electrical signal TOR card - alarm state relay (option).
Detection and identification of defects at a distance (via :RS 232).
Differential circuit-breaker (cut current = 30mA).
Display : to crystals liquidate type matrical 2 lines of 16 characters.
Simultaneous display of:
Oven and cold temperature.
Instantaneous airflow and volume accrued.
Duration of the trapping and alarm.
Resumption of running witnesses of the oven and cold group by LED diode on front panel of MARC 7000 equipment.
Power consumption by the cold system: 400 Watts.
MECHANICAL SPECIFICATIONS
Monoshell BOX in alloy of aluminium.
Front panel in LEXAN anti-stripe material.
Box painted : special powder paint, seed look.
Main materials constituting the mechanical parts are; PVC, POLYACETAL, POLYAMID, NYLON, Alloy of Aluminium, STAINLESS Steel, brass nickel-plated.
Feeding-bottles glass.
Pump of air aspiration : 10 to 55 liters per hour.
Electronic airflow sensor (accurate= 1% calibrated).
Oxidizing oven (for catalysis) in STAINLESS steel built. Axial Ingate opening (for catalytic recharging) and radial glove finger for control of the temperature by stallion thermometer. Fastly and well-off recharging catalysis.
Catalysis : Paladium on alumina in STEEL cartridge (annual replacement if the TRITIUM trapping is important in concentration).
Meadow-paper filter to the admission of air (= 45 mm).
Operating temperature : +2°C to + 45°C.
Storage temperature : -5°C to + 70°C.
Running device under 0°C is impossible with this device
Weight of the machine : withoutcold systemoption:18Kg. With cold system option : 29 Kg.
Carriage : 3 handles system for comfortably transportation by 2 people.
Dimensions : Length= 580 mm, Height= 265 mm, Depth= 210 mm.
[**] Cooling system of water (optional) :
Pump of water circulation (2 liters per minute).
Cold system with condenser. Thermal dissipation insured by a turbine to air. Mini temperature obtained = +2°C to +30°C under ambient temperature or +9°C to +45°C under ambient temperature.
The water temperature plug of the feeding-bottles been made in the circuit of water Cold system.
The optional cooling system can be installed on standard SDEC France collectors.