Swiss federal authorities

Nuclear facilities

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  • Fissures in the KKM Core Shroud: ENSI’s Previous Assessment is Confirmed

    The core shroud in the Mühleberg nuclear power plant (KKM) will continue to perform its function without additional measures. New measurements of the fissures in two of the weld seams on the core shroud confirm ENSI’s previous assessment, and prove that the fissures do not penetrate the walls, and do not run all the way…

  • Mühleberg Core Shroud: ENSI Requires a Long-Term Solution

    Despite the known presence of fissures, the core shroud of the Mühleberg power plant (KKM) does not represent a risk until further notice. It will perform its function in the coming years even without any additional measures.

  • Events, Events Mühleberg

    KKM: Possible Blockage of the Special Emergency System Water Intake in case of Extreme Flooding (as at: 07.10.2011)

    As a measure following on from the reactor accident at Fukushima, Japan, ENSI ruled on 1 April 2011 that the Swiss nuclear power plant operators must furnish proof of their ability to control a very unlikely extreme flood, and must do so by the end of June 2011.

  • News

    Swiss nuclear power plants will cope with flooding

    All of Switzerland’s nuclear power plants will cope with an extreme flood of the sort that may occur on average once every 10,000 years, in addition to their ability to cope with other hazards. Even if the external power supply fails at the same time as the flood occurs, the plants can be brought into…

  • Events

    ENSI combines events and findings under the term “events”. Both events relevant to nuclear safety and security and events of public interest are subject to reporting. The latter includes events on the site of the nuclear installation that are perceptible from outside the site boundaries, regardless of their importance for nuclear safety. ENSI informs the…

  • Interim storage facilities

    Each nuclear power plant has facilities for the conditioning and interim storage of the radioactive waste that is produced during operation.

  • Kernkraftwerk Leibstadt mit Wiesenansicht
    Events, Events Leibstadt

    KKL: Automatic Turbine Shutdown (as at: 30.06 2011)

    A faulty resistor on an electronic card led to the failure of a module in the turbine control system. As a result, the control dampers on the low pressure turbines closed slowly.

  • Events, Events Leibstadt

    KKL: Weld Seam Leak on Small-Bore Pipe of the High Pressure Core Spray (CS) System (as at: 13.04.2011)

    During a function test on the high pressure core spray (CS) system, a thin jet of water was detected. This jet emerged from a weld seam on a small-bore pipe leading to a safety valve. The function test was interrupted, and the affected section of the small-bore pipe was replaced within the permissible time for…