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Residual Heat Removal

This system is backed-up by a Standby Liquid Control System (SLCS) that injects sodium pentaborate into the moderator using a positive displacement pump (shown as a piston pump). Steam that originates in the core of a BWR, unlike the primary coolant in a PWR, exits the containment. The closing of the MSIVs isolates the radioactivity from the environment but when this is done, normal heat removal is not possible. The Residual Heat Removal (RHR) system... [Pg.212]

Prevent containment ova-pressure Residual heat removal system Shutdown cooling system Containment spray system... [Pg.214]

The AP600 passive safety system includes subsystems for safety injection, residual heat removal, containment cooling, and control room habitability under emergency conditions. Several of these aspects are in existing nuclear plants such as accumulators, isolation condensers as natural-circulation closed loop heat removal systems (in early BWRs), automatic depressurization systems (ADS - in BWRs) and spargers (in BWRs). [Pg.216]

High-pressure coolant injection and reactor core isolation cooling when residual heat removal has failed... [Pg.394]

P RHR HX - Passive residual heat removal heat exchanger. [Pg.464]

The passive residual heat removal heat exchangers remove cote decay heat if steam generator heat removal is not available. Passive residual heat removal heat exchangers in the in-containment refueling water storage... [Pg.1119]

Passive Containment Cooling Air Inlets 16. Passive Residual Heat Removal Heat Exchangers 26. Spargers (2)... [Pg.1120]

Fig. 37. Schematic representation of the in-containment passive safety injection system (PS1S). 1RWST = in-containment refueling water storage tank. PRHR-HX = passive residual heat removal heat exchanger. ADS = automatic depressurization system (four stages). (Westinghouse)... Fig. 37. Schematic representation of the in-containment passive safety injection system (PS1S). 1RWST = in-containment refueling water storage tank. PRHR-HX = passive residual heat removal heat exchanger. ADS = automatic depressurization system (four stages). (Westinghouse)...
In case of CASCADE type storage, residual heat removal is carried out, basically, by means of natural convection and radiation heat transfer. The implemented assessments have showed that the calculated maximum temperature in the storage facility (fuel zone) did not exceed 100 °C with the tube spacings being 50 cm. At the same time, the temperature of the interior surface of the built-in structure is 45-50° C. The temperature of the basic bulk of materials in the storage, as estimated, does not exceed 40 °C. [Pg.281]

High Safety. Following features make the reactor more safe during its operation double pressure vessel, natural circulation (There is no big sized penetration on the pressure vessel), self pressurizer, gravity boron injection and residual heat removing system with natural circulation etc. [Pg.23]

Passive Residual Heat Removal System (PRHRS)... [Pg.81]

EDRS Eme t ency Decay Heal Removal System CWCS Containment Water Cooling System RHRS Residual Heat Removal System MSL Main Steam Line FVn.. Feed Water line... [Pg.91]

In the normal operation manual, the reactor decay heat after the reactor shut down is to be removed through the steam generator and the residual heat removal system like the land based PWRs. When this normal procedure is not available due to an accident, the decay heat is removed passively by helps of the EDRS and the CWCS as shown in Fig. 5. The decay heat is transferred from the primary coolant to the water of the containment through the heat exchanger of EDRS, and... [Pg.92]

Long term coolant Low pressure coolant injection system (2) Re-circulation coolant system (1) Static residual heat removal system (2) (Natural circulates) Emergency decay heat removal system (3) (Natural circulates)... [Pg.98]

In PWRs, natural circulation is not a mode of residual heat removal during shutdown conditions as dedicated RHR systems are used. It is only a transient condition in case of a trip of all RCPs. That is why problems with degradation of natural circulation are not reported frequently for PWRs. [Pg.18]

Sufficient information on degradation of residual heat removal should be provided for operators. [Pg.19]

Enhance the availability of the residual heat removal function by requiring alternative cooling methods (i.e. spent fuel pool cooling system). [Pg.25]

Initial work on direct gas turbine cycle was performed at OKBM in early of 80-th as applied to VG 400 reactor. The layout and parameters of the reactor are given in Fig.5. The cavities of the reactor vessel are contained the core, two horizontal turbomachine, recuperators and coolers. Residual heat removal under normal and accident conditions is... [Pg.42]

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

To detect conditions that may result in loss of residual heat removal capability and excessive radiation levels, and... [Pg.20]

See other pages where Residual Heat Removal is mentioned: [Pg.239]    [Pg.126]    [Pg.201]    [Pg.207]    [Pg.210]    [Pg.216]    [Pg.388]    [Pg.464]    [Pg.1106]    [Pg.1111]    [Pg.280]    [Pg.280]    [Pg.280]    [Pg.283]    [Pg.340]    [Pg.170]    [Pg.170]    [Pg.202]    [Pg.219]    [Pg.4]    [Pg.59]    [Pg.73]    [Pg.75]    [Pg.80]    [Pg.98]    [Pg.17]    [Pg.23]    [Pg.26]    [Pg.34]    [Pg.50]    [Pg.71]   


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