A reactor control interface comprising: a home screen video display unit, VDU, comprising a home screen arranged for representing a nuclear power plant, the reactor control interface being configured to display on the home screen VDU: blocks representing functional components of a nuclear power plant including at least blocks representing functional components of a normal heat sinking path of the nuclear power plant and blocks representing functional components of at least one remedial heat sinking path of the nuclear power plant, a normal heat sinking path corresponding to the heat sinking path during normal operation of the nuclear power plant and a remedial heat sinking path corresponding to the heat sinking path when a deviation from the normal operation has occurred and remedial action is taken, and connecting arrows of a first type connecting blocks that are providing the current heat sinking path wherein directions of the connecting arrows of the first type represent the direction of heat flow along the current heat sinking path and wherein connecting arrows of the first type do not connect blocks that are not providing the current heat sinking path. a home screen video display unit, VDU, comprising a home screen arranged for representing a nuclear power plant, the reactor control interface being configured to display on the home screen VDU: blocks representing functional components of a nuclear power plant including at least blocks representing functional components of a normal heat sinking path of the nuclear power plant and blocks representing functional components of at least one remedial heat sinking path of the nuclear power plant, a normal heat sinking path corresponding to the heat sinking path during normal operation of the nuclear power plant and a remedial heat sinking path corresponding to the heat sinking path when a deviation from the normal operation has occurred and remedial action is taken, and connecting arrows of a first type connecting blocks that are providing the current heat sinking path wherein directions of the connecting arrows of the first type represent the direction of heat flow along the current heat sinking path and wherein connecting arrows of the first type do not connect blocks that are not providing the current heat sinking path. blocks representing functional components of a nuclear power plant including at least blocks representing functional components of a normal heat sinking path of the nuclear power plant and blocks representing functional components of at least one remedial heat sinking path of the nuclear power plant, a normal heat sinking path corresponding to the heat sinking path during normal operation of the nuclear power plant and a remedial heat sinking path corresponding to the heat sinking path when a deviation from the normal operation has occurred and remedial action is taken, and connecting arrows of a first type connecting blocks that are providing the current heat sinking path wherein directions of the connecting arrows of the first type represent the direction of heat flow along the current heat sinking path and wherein connecting arrows of the first type do not connect blocks that are not providing the current heat sinking path.