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Vol.7 No.1previous AASP14 (87-88-89-90-91-92-93-94-95-96-97-

Academic Articles
Regular Paper Vol.7 No.1 (2015) p.34 - p.42

Noble Gas Control Room Accident Filtration System for Severe Accident Conditions (N-CRAFT)

Axel HILL1, Dr. Cristoph STIEPANI2, Michael DRECHSLER2

1 AREVA GmbH, Kaiserleistr. 29, 63067 Offenbach, Germany
2 AREVA GmbH, Paul-Gossen-Str. 100, 91052 Erlangen, Germany


Severe accidents might cause the release of airborne radioactive substances to the environment of the NPP either due to containment leakages or due to intentional filtered containment venting. In the latter case aerosols and iodine are retained, however noble gases are not retainable by the FCVS or by conventional air filtration systems like HEPA filters and iodine absorbers. Radioactive noble gases nevertheless dominate the activity release depending on the venting procedure and the weather conditions. To prevent unacceptable contamination of the control room atmosphere by noble gases, AREVA GmbH has developed a noble gas control room accident filtration system (CRAFT) which can supply purified fresh air to the control room without time limitation. The retention process is based on dynamic adsorption of noble gases on activated carbon. The system consists of delay lines (carbon columns) which are operated by a continuous and simultaneous adsorption and desorption process. CRAFT allows minimization of the dose rate inside the control room and ensures low radiation exposure to the staff by maintaining the control room environment suitable for prolonged occupancy throughout the duration of the accident. CRAFT consists of a proven modular design either transportable or permanently installed.


Severe Accident Filtration System, CRAFT, Noble Gas Retention
Full Paper: PDF EJAM Vol.7No.1 pp.34-42 "Noble Gas Control Room Accident Filtration System for Severe Accident Conditions (N-CRAFT)"
Article Information
Article history:
Received 28 October 2014
Accepted 10 February 2015