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  • Background articles, Posts

    Series of articles on barriers 6/6: The containment holds radioactive substances in the reactor building

    The reactor pressure vessel is enclosed by the containment as the third barrier. This consists of a steel primary containment and a concrete secondary containment.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles, Posts

    Series of articles on barriers 5/6: The water circuit (primary circuit part 2 of 2)

    With its pipelines, shut-off valves and other components, the cooling circuit, together with the reactor pressure vessel, is the second barrier for trapping radioactive substances.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles, Posts

    Series of articles on barriers 4/6: The reactor pressure vessel (primary circuit part 1 of 2)

    The reactor pressure vessel, together with the water’s cooling circuit, is the second barrier for trapping radioactive substances.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles, Posts

    Series of articles on barriers 3/6: The fuel rod cladding tubes (fuel assemblies part 2 of 2)

    The fuel pellets are filled into metal tubes. Together with the nuclear fuel matrix, the cladding tubes are the first barrier for trapping radioactive substances in nuclear power plants.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles, Posts

    Series of articles on barriers 2/6: The nuclear fuel matrix (fuel assemblies part 1 of 2)

    The nuclear fuel is pressed into pellets and compacted using the sintering process before use in nuclear power plants. This process transforms the nuclear fuel into a ceramic material, which is able to retain the fission products that arise during operation in the nuclear fuel matrix.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles, Posts

    Series of articles on barriers 1/6: Barriers protect people and the environment from radioactive substances

    The barrier concept aims to trap sources of radiation in nuclear facilities across several levels. Similar to the layers of an onion, independent barriers ensure that the risk from sources of radiation are minimised for people and the environment.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles

    Dispersion modelling

    Protection of the population and ecosystems take priority if there is an unplanned release of radioactivity. To do so, it is essential to identify the areas most at risk from radioactivity as early as possible. However, before any radioactivity is released (in the pre-phase) no radioactivity measurements are available. Therefore, the hazard can only be…

    Dispersion Models, Emergency Preparedness, In the Event of an Incident, Propagation
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  • Background articles, Posts

    Dryout: Preventing inadequate cooling of fuel rods

    Heat is generated in the reactor as a result of nuclear fission. To guarantee optimum cooling of the fuel rods, their cladding tubes must always be covered with a film of water. If they are not completely covered with water in specific areas, this is referred to as “dryout”.

    Leibstadt Nuclear Power Plant, Mühleberg Nuclear Power Plant, Nuclear Facilities
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  • Background articles, Posts

    Prevention of sabotage and theft: an overview

    «The protection of nuclear installations and nuclear materials against sabotage, violent actions or theft has to be based on an in-depth defence system which involves structural, technical, organisational, personnel and administrative measures. In my section we examine the measures in effect at nuclear installations on the basis of national and international requirements. To determine the…

    Domains/Sections, ENSI, Organisation, Security
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