Each NuScale Power Plant is self contained and each module operates independent of the other in a multi-module configuration. However, all are managed from a single control room. The reactor pressure vessel (1) measures 45 x 9. It sits within a containment vessel (2) . The integrated Reactor and...

The reactor vessel assembly, shown below, consists of the reactor vessel and its internal components, including the core support structures, core shroud, moisture removal equipment, and jet pump assemblies. The purposes of the reactor vessel assembly are to: • House the reactor core, • Serve...

The reactor core isolation cooling (RCIC) system provides makeup water to the reactor vessel for core cooling when the main steam lines are isolated and the normal supply of water to the reactor vessel is lost. The RCIC system consists of a turbine-driven pump, piping, and valves necessary to deliver...

The purpose of the reactor water cleanup system (RWCU) is to maintain a high reactor water quality by removing fission products, corrosion products, and other soluble and insoluble impurities. The reactor water cleanup pump takes water from the recirculation system and the vessel bottom head and pumps...

Heat is removed during normal power operation by generating steam in the reactor vessel and then using that steam to generate electrical energy. When the reactor is shutdown, the core will still continue to generate decay heat. The heat is removed by bypassing the turbine and dumping the steam directly...

The standby liquid control system injects a neutron poison (boron) into the reactor vessel to shutdown the chain reaction, independent of the control rods, and maintains the reactor shutdown as the plant is cooled to maintenance temperatures. The standby liquid control system consists of a heated...

The emergency core cooling systems (ECCS) provide core cooling under loss of coolant accident conditions to limit fuel cladding damage. The emergency core cooling systems consist of two high pressure and two low pressure systems. The high pressure systems are the high pressure coolant injection (HPCI...

The high pressure coolant injection (HPCI) system is an independent emergency core cooling system requiring no auxiliary ac power, plant air systems, or external cooling water systems to perform its purpose of providing make up water to the reactor vessel for core cooling under small and intermediate...

The low pressure emergency core cooling systems consist of two separate and independent systems, the core spray system and the low pressure coolant injection (LPCI) mode of the residual heat removal system. The core spray system consists of two separate and independent pumping loops, each capable of...

The Mark I containment design consists of several major components, many of which can be seen on below. These major components include: The drywell, which surrounds the reactor vessel and recirculation loops A suppression chamber, which stores a large body of water (suppression pool) An interconnecting...

The Mark II primary containment consists of a steel dome head and either a post-tensioned concrete wall or reinforced concrete wall standing on a base mat of reinforced concrete. The inner surface of the containment is lined with a steel plate that acts as a leak-tight membrane. The containment wall...

The Mark III primary containment consists of several major components, many of which can be seen below. The drywell (13) is a cylindrical, reinforced concrete structure with a removable head. The drywell is designed to withstand and confine steam generated during a pipe rupture inside the containment...

The primary containment package provided for a particular product line is dependent upon the vintage of the plant and the cost-benefit analysis performed prior to the plant being built. During the evolution of the boiling water reactors, three major types of containments were built. The major containment...

Boiling Water Reactor Plant Inside the boiling water reactor (BWR) vessel, a steam water mixture is produced when very pure water (reactor coolant) moves upward through the core absorbing heat. The major difference in the operation of a BWR from other nuclear systems is the steam void formation...

Coolant Light water is used as the primary coolant in a PWR. It enters the bottom of the reactor core at about 275 °C (530 °F) and is heated as it flows upwards through the reactor core to a temperature of about 315 °C (600 °F). The water remains liquid despite the high temperature...

The PWR cooling system is provided in order to circulate the reactor coolant heated with the thermal energy generated in a reactor core and to generate high-energy steam by conducting heat exchange at a steam generator to drive a turbine, and has the following functions; To circulate the reactor...

(1) Power control method As the reactor coolant (primary coolant) of PWR maintains the high-pressure of 157 kg/cm2 over the entire region of the flow path with the pressurizer, boiling would not occur in the reactor core even if the power fluctuates, and the liquid phase is kept. Therefore, since...

A pressurized-water-type nuclear power reactor (PWR) uses light water as the reactor coolant and moderator in the state of high temperature and high pressure not boiling in the reactor core (primary system: reactor coolant system) and sends the high-temperature and high-pressure water to steam generators...

WH PWRs WH-type PWRs increased the number of steam generators and reactor coolant pumps following the increase in the electrical output (large-scale plant). For 1000 MWe class WH-type PWRs, as shown below, the primary cooling system consists of four loops (four steam generators and four primary coolant...

Simplified Plant Arrangement The AP1000 has a smaller footprint than an existing nuclear power plant with the same generating capacity. The plant arrangement provides separation between safety-related and non-safety-related systems to preclude adverse interaction between safety-related and non-safety...

The PWR consists of a primary system (reactor system) and a secondary system (steam system) in order to keep radioactive materials in the primary system. The reactor coolant in a reactor vessel (reactor coolant) of the primary system is pressurized so that it circulates with reactor coolant pumps without...

TEPCO April 19th UPDATE Plant Status of Fukushima Daiichi Nuclear Power Station All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down. Unit 1(Shut down) -Explosive sound and white smoke were confirmed after the big quake occurred at 3:36 pm on March 12th. It was assumed to...

Below you will find the following information on the proposed new nuclear power plants in Argentina: Dedicated page per proposed new plant Schedules for new nuclear power license and construction Projections for when the plant will be online Atucha 2 Embalse