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The Automatic Depressurization System (ADS) consists of a series of valves which open to vent steam several feet under the surface of a large pool of liquid water (known as the wetwell or torus) in pressure suppression type containments (typically used in boiling water reactor designs), or directly into the primary containment structure in ...
All BWRs utilize a number of safety/relief valves for overpressure; up to 7 of these are a part of the Automatic Depressurization System (ADS) [1] and 18 safety overpressure relief valves on ABWR models, [2] only a few of which have to function to stop the pressure rise of a transient. In addition, the reactor will already have rapidly shut ...
GE Energy ESBWR website; Status report 100 - Economic Simplified Boiling Water Reactor (ESBWR) [permanent dead link ], ARIS, IAEA, 01-08-2011; POWER magazine article on the ESBWR Archived 2011-10-02 at the Wayback Machine; NRC ESBWR Overview page; ESBWR Probabilistic Risk Assessment; ESBWR Design Control Document, Rev. 10
BWR Type 2 (BWR-2, BWR/2): Introduced in 1963, >500 MW e, typically around 650 MW e gross (Oyster Creek, Nine Mile Point 1). [ 4 ] [ 5 ] Included a large direct cycle. 5 recirculation loops, variable speed external recirculation pumps (one pump per loop, each pump's flow rate could be varied from 6,400 to 32,000 US gallons per minute (0.40 to 2 ...
In a typical depressurization system, the goal is typically reduce the pressure in the plant to less than 50% of the design pressure or to 7 barg, whichever is lower, within 15 minutes. [ 2 ] Disposal of blowdown fluids is generally to flare systems or, if safe to do so, non-fired blowdown drums .
When the IC system is activated, a valve at the bottom of the IC condenser is opened which connects to a lower area on the reactor. The water falls to the reactor via gravity, allowing the condenser to fill with steam, which then condenses. This cycle runs continuously until the bottom valve is closed. [2]
Eighteen SORVs (safety overpressure relief valves), eight of which are part of the ADS (automatic depressurization system), ensure that RPV overpressure events are quickly mitigated, and that if necessary, that the reactor can be depressurized rapidly to a level where low pressure core flooder (LPCF, the high-capacity mode of the residual heat ...
Passive nuclear safety is a design approach for safety features, implemented in a nuclear reactor, that does not require any active intervention on the part of the operator or electrical/electronic feedback in order to bring the reactor to a safe shutdown state, in the event of a particular type of emergency (usually overheating resulting from a loss of coolant or loss of coolant flow).