Method of synchronously replacing a peripheral plant fire-fighting water isolation valve of a nuclear power station
A technology for water isolation valves and nuclear power plants, which can be used in fire rescue and other directions, and can solve problems such as difficulty in replacement and threats to unit safety, and achieve the effect of reducing safety hazards and ensuring safe operation
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[0066] Further, see Figure 1 to Figure 2 , as a specific implementation of the method for synchronously replacing the fire water isolation valves of peripheral buildings in nuclear power plants provided by the present invention, the block isolation S4 step specifically includes:
[0067] The first isolation block S41: closing the valves from each of the host fire-fighting pipe networks 20 to the peripheral fire-fighting pipe network 30;
[0068] The second isolation block S42: close the valves connecting the fire-fighting water pump group 11 to each of the host fire-fighting pipe networks 20;
[0069] The third isolation block S43: close the isolation valves behind the pressure reducing valves on each of the host fire-fighting pipe networks 20 to the peripheral fire-fighting pipe networks 30 .
[0070] Through the step of the above-mentioned first isolation block S41, the fire-fighting water in the host fire-fighting pipe network 20 is prevented from entering the peripheral ...
Embodiment approach
[0094] Further, see Figure 1 to Figure 2 , as a specific embodiment of the method for synchronously replacing the fire water isolation valve of the peripheral building in the nuclear power plant provided by the present invention, the block isolation step S4 also includes steps:
[0095] Overhaul shutdown S2: The steam turbine unit to be overhauled completes the core unloading condition, and the main transformer corresponding to the steam turbine unit is shut down. Safety risks can be further reduced by overhauling and shutting down the S2 step.
[0096] Further, see Figure 1 to Figure 2 , as a specific embodiment of the method for synchronously replacing the fire water isolation valve of the peripheral building in the nuclear power plant provided by the present invention, before the block isolation S4 step, after the overhaul shutdown S2 step, it also includes the steps:
[0097] Evacuation process S3: Evacuate the oil and hydrogen in the conventional island.
[0098] Thr...
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