Passive heat removal system

Third core heat removal system is a passive heat removal system (PHRS). The heat is removed from the monoblock to the water storage tank located around the monoblock vessel. This system ensures the reactor core cooling in case of postulated maximal accident with all secondary equipment failed, reactor protection system failure and total de-energizing of the NPP. [Pg.141]

The passive heat removal system We believe that a specific active residual heat removal system may not be required. [Pg.255]

Light water and enriched uranium Integrated primary system Self-pressurized primary system Cooling by natural circulation Passive heat removal systems... [Pg.270]

First shutdown system absorbing elements Second shutdown system boron injection Passive heat removal system Emergency injection system Containment system... [Pg.274]

Decay heat removal Passive heat removal system Passive... [Pg.280]

Decay Heat Removal Passive heat removal system, PRHRS Passive Self-actuates at P = 0 6 MPa, 2x2 5 m ... [Pg.310]

The system includes two blocks of heat exchangers forming a four-trjun passive heat removal system removing heat into water storage tanks. [Pg.379]

The CWCS is a heat pipe type passive heat removal system and consists of six 25% trains. The containment water coolers (evaporator of heat pipe) are installed in the upper part of the wetwell of the CV. The heat transferred from the C V water by the cooler is removed at the air coolers (condenser of heat pipe) by naturally circulated air. [Pg.409]

Secondary Condensing System (SCS). Passive heat removal system Yes 4 SGs used to feed steam to condensers in RWST... [Pg.428]

An independent passive heat removal system acting as a cooldown system in emergency shutdown of the reactor ... [Pg.169]

The equipment and pipelines of the passive heat removal system ... [Pg.515]

A concrete well is formed in the lower part of each box to install the tank of passive heat removal system (PHRS). The reactor mono-block is installed inside the PHRS tank and is fixed on the support ring of the tank cover. Twelve immersible vertical heat exchangers are also installed in the PHRS tank to transfer heat from the PHRS tank water to the cooling water. [Pg.515]

The possibility of water or steam penetration into the core, e g. caused by a large SG leak, and the consequent over-pressurization of the reactor mono-block vessel (designed to be resistant against the maximum possible pressure under these conditions) are eliminated by the selected circulation scheme of lead-bismuth coolant. This scheme ensures that steam bubbles are thrown out into the gas volume on the coolant free-level by the upward movement of the lead-bismuth coolant flow. Then the steam goes to the gas system condensers. In the event of postulated failure, the steam goes through the rupture membranes to the bubbler devices of the tank of the passive heat removal system (PHRS). [Pg.529]

If the water tank of a passive heat removal system (PHRS) is included as the reactor installation component, it is possible to remove heat from the core via the wall of the reactor mono-block vessel. In the failure of all reactor systems, the PHRS tank offers passive heat removal from the mono-block vessel through the evaporation of water from the tank (by boiling) and steam disposal via the air tubes to the atmosphere. The quantity of water stored in the tank is sufficient to remove heat from the reactor over a 5-day period without any damage to the reactor core. [Pg.531]

To withstand large SG leaks (a postulated rupture of several SG tubes, i.e., a beyond design basis initiating event), the gas system is connected with the passive heat removal system (PHRS) tank. The connection line is blocked by a membrane device designed for rupture under a gas system pressure of 1 MPa that is not dangerous for the reactor mono-block vessel. In the event of membrane rupture, the steam will be condensed in the water of the PHRS tank. In this, the volatile radionuclides of the cover gas remain in the tank water and the radioactive uncondensed gases will be released into the atmosphere via the filtered ventilation system. The radioactivity release will not exceed the permissible levels. [Pg.531]

Reactor installations of this type are tolerant not only to single failures of the equipment or personnel errors but to multiple combinations thereof For example, the emergency protection system is passively actuated each time when lead-bismuth coolant temperature is increased above the preset limit (passive actuation is achieved via melting of the fusible locks) the residual power is released to the passive heat removal system (PHRS) tank via the reactor... [Pg.535]

Passive heat removal system based on molten metal gas gap filling... [Pg.815]

Steam generator shell-side passive heat removal system. 1,300,000 870,000... [Pg.374]

A8.4.7 Steam Generator Shell-Side Passive Heat Removal System... [Pg.391]

Some passive decay heat removal systems, such as a water tank surrounding the reactor vessel of a lead-bismuth cooled SVBR-75/100, could be effective for many heavy metal cooled SMRs. They are also quite common to many innovative water cooled SMRs. To abandon the off-site emergency planning it may be important to develop passive heat removal systems that are effective over the whole run of a design basis accident or even an anticipated transient without scram. This may be a task important for many SMR designs representing several reactor lines. [Pg.23]

GAUTIER, G.-M., BAZIN, P., CHATAING, Th., GULLY, Ph., LAVIALLE, G., Passive heat removal system with the Base Operation Passive Heat Removal strategy. Application with Primary Heat Exchangers, ICONE 7 (Proc. Int. Conf, Tokyo, Japan, April 19-23, 1999) ASME. [Pg.88]

In the AHWR, a large pool of water is provided at high elevation near the top of the containment. This pool named Gravity Driven Water Pool acts as the heat sink for a number of passive heat removal systems including the PCCS. The passive external condensers (PEC) of the PCCS are connected to the pool as shown in Fig. 7. The containment steam condenses on the outer surface of tubes of PEC. The water inside the tubes takes up the heat from air/vapour mixture and gets heated up. Due to the heating up of water the natural circulation of water from the pool to PEC and from PEC to pool is established. [Pg.149]

Safety systems are represented by emergency protection system of the reactor (EP), system of leak localization in the SGs, autonomous cooling system (ACS), and passive heat removal system (PHRS). Of them only EP is a dedicated safety system, while other systems, namely the system of leak localization in the SGs, ACS, and PHRS combine the functions of normal operating systems and accident prevention systems. [Pg.163]

The long and narrow design of the reactor allows for optimal passive heat removal from the core even under conditions with no coolant flow and the reactor depressurized. Heat flow through conduction and radiation to the RPV, and subsequent removal through the passive heat removal system in the reactor cavity, will limit the maximum fuel temperature and the vessel temperature so that both remain in the safe region. [Pg.431]

Core damage prevention (Passive heat removal systems) Target core damage frequency (CDF) less than lOVreactor-year PEACER should have a CDF lower than that of advanced LWRs... [Pg.659]

Inherent safety features and passive heat removal systems... [Pg.426]

SOPLENKOV, K.I., et al., Design and testing of passive heat removal system with ejector-condenser . Progress in Design, Research and Development and Testing of Safety Systems for Advanced Water Cooled Reactors, IAEA-TECDOC-872, Vienna, 1996. [Pg.44]

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