Translation of "Notkühlsystem" in English

The emergency cooling system as claimed in claim 3,

The emergency cooling system as claimed in claim 3, wherein

The emergency cooling system of the prior art was simple and convenient; however it had two disadvantages.

Besides the cooling of the storage container 7 by means of the coolant which is conveyed in the above described closed circuit, an emergency air cooling system is also provided.

Then, if the emergency cooling systems function satisfactorily, it is possible to sufficiently cool down the primary circuit and the secondary circuit after some time, so that a repair of the ripped or damaged main coolant line becomes possible.

Then, if the emergency cooling system which supplies emergency cooling water to the reactor pressure vessel through its main coolant lines HL should break down for any reason, so that the water level in the reactor pressure vessel 6 begins to fall, finally the core 10 seen in FIG. 1 will no longer be covered by cooling water and the remaining cooling water in the reactor pressure vessel 6 will also evaporate without a replacement being possible, if the hypothetical event of a core melt occurs.

The engineers violated six safety procedures and regulations including disengaging the emergency cooling system, disengaging the automatic control system, switching off emergency warnings and then raising the control rods to get more power.

In the design scenario for the emergency cooling system it is assumed that insulation debris and chunks of concrete which arise in an incident can fall down into the sump and/or be washed down into the sump by the downwardly flowing water.

Furthermore, the reactor is equipped with an emergency cooling system (termed Emergency Core Cooling System or ECCS or Containment Spray System or CSS) in order to cool the reactor core in the event of a malfunction or incident.

In the design scenario for the emergency cooling system it is assumed that debris which arises in an incident falls down into the sump and/or is washed down into the sump by the downwardly flowing water.

The emergency cooling system as claimed in claim 1, wherein the at least one plug is soldered or welded into an associated at least one emergency cooling opening.

The emergency cooling system as claimed in claim 1, wherein the at least one plug is configured and arranged to melt when it is exposed to the predetermined temperature or a higher temperature, for a predetermined time.

Furthermore, the reactor is equipped with an emergency cooling system (termed Emergency Core Cooling or ECC in English) in order to cool the reactor core in the event of a malfunction or incident.

The spent nuclear fuel pool emergency cooling system of claim 3 wherein the pressurized gas is connected to a gas driven mechanical pump.

The spent nuclear fuel pool emergency cooling system (10) of Claim 4 wherein the gas driven mechanical pump (32) is an air operated double diaphragm pump (30).

The spent nuclear fuel pool emergency cooling system (10) of Claim 7 wherein the compressed gas turbo generator (40) is adapted to drive an air cooling system (48).

The spent nuclear fuel pool emergency cooling system (10) of Claim 1 wherein the cryogenic fluid is nitrogen or mixtures of nitrogen.

The spent nuclear fuel pool emergency cooling system (10) of Claim 1 wherein the position wherein the second side portion of the evaporator heat exchanger (12) is laterally spaced from the wall (24) of the spent fuel pool (22) places the evaporator heat exchanger in a substantially horizontal position, to ensure the evaporator heat exchanger is submerged in the coolant of the spent fuel pool.

The spent nuclear fuel pool emergency cooling system (10) of Claim 3 further comprising a compressed gas turbo generator (40) and wherein the pressurized gas is connected to the compressed gas turbo generator (40).

The spent nuclear fuel pool emergency cooling system (10) of Claim 9 wherein the electrical pump (42) is adapted to supply make-up water (46) to the spent fuel pool (22).

The spent nuclear fuel pool emergency cooling system (10) of Claim 4 wherein the gas driven mechanical pump (32) is adapted to supply makeup water to the spent fuel pool (22).

The spent nuclear fuel pool emergency cooling system (10) of Claim 7 wherein the compressed gas turbo generator (40) is adapted to provide power to an electrical pump (42).

The spent nuclear fuel pool emergency cooling system (10) of Claim 8 further comprising a gas to air heat exchanger (44) and being configured such, that the pressurized gas exiting the internal fluid path is conducted through the gas to air heat exchanger (44) after driving the compressed gas turbo generator (40).

The spent nuclear fuel pool emergency cooling system (10) of Claim 1 wherein the evaporator heat exchanger (12) is supported substantially vertically upward from the wall (24) of the spent fuel pool (22).

The spent nuclear fuel pool emergency cooling system (10) of Claim 1 wherein the evaporator heat exchanger (12) has an inlet (14) and an outlet (16) to the internal fluid path and the internal fluid path extends in a serpentine pattern between the inlet and the outlet.

A complete cooling plant with an emergency cooling plant and a heat recovery system that make best use of the residual heat from the waste gas will be supplied to cool the transport system in the furnace.