Severe Accident Prevention


At the ATMEA Company, we believe accident prevention is of the utmost importance to any nuclear reactor design. From incorporating proven technologies already in use in EDF Group and MHI reactors around the world to using top-level safety features, we take every step necessary to reduce risk for operators and the general public.

Next-generation protection through independent safety redundancy

The ATMEA1 reactor’s safety systems are protected using hardened protective shells and geographic segregation that safeguard against a wide range of external hazards, including:

  • Seismic activity
  • Flood
  • Explosion
  • Missile
  • Tornado
  • Fire
  • Airplane crash

To ensure these external hazards do not trigger release of radioactive material exceeding radiological limits, the ATMEA1 reactor is equipped with the following:

  • Sufficient structural integrity to house important safety functions
  • Features to prevent airplane fuel from entering buildings
  • Capabilities for safe shutdown
  • Emergency core cooling
  • Residual heat-removal systems

The unrivaled reliability of active systems, for an always-on cooling function

Giving the operator the freedom to adapt and the chance to successfully handle even the worst accidents is the essence of safety. The ATMEA1 reactor thus leverages all the power and flexibility of active technologies to provide the operator with a fully dependable cooling function, even in worst-case scenarios.

Three independently active safety trains with 100% capacity are fitted to three reactor loops and backed by an additional safety train called Division X (Div X). Each safety train is located in its own division and protected from internal hazards such as fire or flood. Safety trains are equipped with the following:

  • Safety injection systems (Division A, B, C):  In case of rupture or breach in the primary loops, emergency coolant water is immediately re-circulated by passive advanced accumulators that self-activate without an electrical trigger.
  • Containment spray and residual heat removal systems (Division A, B, C): Reactor building conditions are kept within design limits via normal shutdown cooling and containment spray injection.
  • Emergency power supply: All safety trains are fitted with emergency power and an alternative AC source to power essential systems during station blackout.
  • In-containment refueling water storage pit: Located at the bottom of the reactor building, this pit provides water storage for safety injection and a dedicated spreading area for molten core material in case of severe accident.
  • Fuel pool cooling (Division A, C): Located in a dedicated building, the fuel pool simplifies access for fuel handling during plant operation. Cooling is assured by two redundant cooling trains and an additional heat-removal system.
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