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The AP1000 passive safety injection system uses three sources of water for RCS make-up. CMTs (Core Make-up Tanks) provide coolant at full system pressure to downcomer through DVI (direct vessel injection) line. Two accumulators provide coolant at high flow rates once RCS pressure is < 700 psig (4.9 MPa).
6. Engineered Safety Features AP1000 Design Control Document Tier 2 Material 6.3-5 Revision 19 6.3.1.1.6 Reliability Requirements The passive core cooling system satisfies a variety of reliability requirements, including
A major safety advantage of passive plants versus current or evolutionary light water reactors (LWRs) is that long-term accident mitigation is maintained without operator action or reliance on off-site or on-site AC power. The AP1000® PWR uses extensively analyzed and tested passive safety systems to improve the safety of the plant.
2. Describe how the following passive core cooling system components support performance of the safety functions listed above (Objective 1): a.a. Core makeup tanks Core makeup tanks b Accumulators 3. c.c. In In--containment refueling water storage tank containment refueling water storage tank (IRWST) d.d. pH adjustment baskets pH adjustment baskets
By contrast, the AP1000 passive core cooling system uses staged reservoirs of borated water that are designed to discharge into the reactor vessel at various threshold state points of the primary system. To begin the description, let us first see the configuration of the AP1000 reactor primary coolant system shown in Figure 4.
The Passive Core Cooling System (PXS) of the AP1000TM plant performs: • Emergency core decay heat removal • Reactor coolant system emergency makeup and boration • Containment pH control • Safety injection All safety functions of the AP1000 TM rely on natural forces like natural circulation, gravity, convection, evaporation,
2. Passive Core Cooling System The Passive Core Cooling System (PXS) of the AP1000 TM plant provides emergency core cooling following postulated design basis events (1). To accomplish this primary function, the passive core cooling system is designed to perform the following functions: Emergency core decay heat removal
A typical AP1000 plant is a 3400 MWt PWR with an 1117 MW nominal capacity for electricity generation. The core is designed for an 18-month fuel cycle, contains 157 fuel assemblies and it features emergency core cooling and containment cooling systems. The major safety systems in AP1000 are passive.
As an advanced Gen III+ plant with passive safety systems, the AP1000® plant is uniquely equipped to handle an extended station blackout (SBO) event similar to what occurred at the Fukushima-Daiichi plants in March of 2011. These passive systems have been designed to maintain core cooling for up to 72 hours following all design basis events without the need for AC power or operator action ...
The AP1000 design is derived directly from the AP600, a two-loop, 600-MWe PWR. The AP1000 retains the AP600 approach of using proven PWR technology and safety features that rely on natural forces. The AP1000 passive safety systems are the same as those for the AP600, except for some changes in component capacities.
The AP1000 ® plant is an advanced Pressurized Water Reactor designed and developed by Westinghouse Electric Company which relies on passive safety systems for core cooling, containment isolation and containment cooling, and maintenance of main control room emergency habitability. The AP1000 design obtained the Design Certification by NRC in ...
For this purpose, a single loop model of AP1000 passive core cooling system (PXS) and passive containment cooling system (PCCS) are assumed separately for quantitative reliability evaluation. The transient behaviors of these passive safety systems are taken under the large break loss-of-coolant accident in the cold leg.
Safety is always the number one priority of the AP1000 plant. During a station blackout, or loss of all electrical power, the AP1000 plant's passive safety system shuts down the reactor automatically, with no need for human intervention for up to 72 hours. The AP1000 plant's truly innovative technology harnesses natural forces like gravity ...
AP1000 RCS and Passive Core Cooling System Fig.5. Passive Containment Cooling System Balendra Sutharshan et al. / Energy Procedia 7 (2011) 293–302 297 The passive safety systems have been sized to provide increased safety margins, especially for more probable events. Table 2 illustrates the improved margins.
The AP1000 reactor safety-related passive systems and equipment are sufficient to automatically establish and maintain core cooling and containment integrity indefinitely following design-basis events, assuming the most limiting single failure, with no operator action, and no on-site or off-site ac power sources. An additional level of defense ...
The Advanced Passive 1000 (AP1000) is a nuclear pressurized water reactor (PWR) originally designed by Westinghouse Electric Company. With the AP1000, Westinghouse sought to design a reactor that operated using conventional pressurized water reactor principles, while incorporating novel safety measures in order to increase reliability and cost-competiveness relative to competing reactor plants.
This report describes the results of NERI research on the testing of advanced passive safety performance for the Westinghouse AP1000 design. The objectives of this research were: (a) to assess the AP1000 passive safety system core cooling performance under high decay power conditions for a spectrum of breaks located at a variety of locations, (b) to compare advanced thermal hydraulic computer ...
passive core cooling system does require a one-time alignment of valves upon actuation of the specific components. 6.3.1 Design Basis The passive core cooling system is designed to perform its safety-related functions based on the following considerations: • It has component redundancy to provide confidence that its safety-related functions are
The reactor coolant system is also served by a number of auxiliary systems, including the chemical and volume control system (CVS), the passive core cooling system (PXS), the normal residual heat removal system (RNS), the steam generator system (SGS), the primary sampling system
A potential scheme of the passive cooling system consisting of bundles of large separate heat pipes is presented. ... reactor AP1000, the C-shape Passive Residual Heat Removal Heat Exchanger (PRHR ...