Passive residual heat removal

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)...

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

The reaaor residual heat is removed by a passive residual heat removal stem which connects to the intermediate circuit. There are two independent trains of theRHRS which composed of three natural circulation loops. (See Fig. 4)... [Pg.64]

In addition to these features, all designs allow for the passive residual heat removal in case of loss of power. CANDU 3 emphasized the assurance of high capacity factor, the maximization of component life and the easy replacement of components. [Pg.112]

Passive residual heat removal (PRHR) system ... [Pg.70]

Passive Residual Heat Removal system X 2 HX within the In-containment Refueling Water Storage Tank (IRWST) Permanently connected to the pnmary circuit... [Pg.74]

Passive Core Cooling System X Safety Injection, Depressurization and Passive Residual Heat Removal... [Pg.74]

Decay heat removal Passive Residual Heat Removal System (PRHR) Passive Non-LOCA heat removal... [Pg.76]

Passive residual heat removal system (PRHRS) X 3 channels 1 channel on the reactor, 2 channels to the secondary circuit 1 loops... [Pg.133]

Density locks (thermal barriers), siphon breakers, and wet thermal insulation Prestressed concrete reactor vessel Long-term passive residual heat removal system Reactivity control without control rods... [Pg.242]

Passive residual heat removal X Two independent systems transfer core decay heat to atmosphere by natural circulation... [Pg.261]

Passive residual heat removal system X 2 trains, using the steam generators... [Pg.278]

Strong negative temperature coefficient Limits consequences Passive residual heat removal Limits... [Pg.279]

Passive Residual Heat Removal System X Heat transfer from primary coolant to CV water by natural circulation of coolant in S.G. [Pg.292]

Possibility and simplicity of SG leaky section isolation L AT WS Increased values of negative reactivity coefficients, passive ERHR systems L Pnmary transients Greater pnmary inertia L Secondaiy transient Multichannel shutdown and RHR systems L Loss of electnc sources - Implementation of passive systems (battery power sources) L Total loss of heat sink Passive heat removal to ambient air, non-cntical L Total loss of S G feedwater non-cntical - Passive residual heat removal L Station Blackout non-cntical - Passive shutdown and RHR systems L... [Pg.309]

Passive Residual Heat Removal System X 2 100% trains of natural-circulation water loops permanently connected to the primary circuit and cooled by external air. Only one non-static component, passive type (special check valve), 400% redundant... [Pg.476]

Passive residual heat removal X Heat removal by sec.water through... [Pg.510]

A passive residual heat removal (PRHR) nozzle attaches to the bottom of the channel head of the loop-1 steam generator on the cold-leg portion of the head. This nozzle provides recirculated flow from the PRHR heat exchanger to cool the primary side under emergency conditions. A separate nozzle on one of the steam generator channel heads is connected to a line from the CVCS. The nozzle provides for purification flow and makeup flow from the CVCS to the RCS. [Pg.70]

Passive residual heat removal based on heat pipes and atmospheric water heat exchanger. [Pg.325]

PRHRHX Passive Residual Heat Removal Heat Exchanger... [Pg.21]

If the duty systems are unavailable, or are imable to control the ult, passive residual heat removal (PRHR) is initiated and the CMTs actuated to inject borated water into the reactor coolant system (RCS). In most cases this will be sufficient to manage the fault for at least 72 hours. [Pg.118]

AP Core damage with no depressurisation following small LOCA and very small LOCA with passive residual heat removal operating or medium LOCA... [Pg.161]

If the secondary heat removal system is not operable then the passive residual heat removal heat exchanger, in conjunction with the passive containment cooling system, is designed to remove decay heat for an indefinite time in a closed-loop mode of operation. [Pg.191]

The passive residual heat removal heat exchanger is designed to cool the reactor coolant system to 216°C (420°F) in 36 hours, with or without reactor coolant pumps operating (Reference 6.1, Section 6.3.1.1.1). This allows the reactor coolant system to be depressurised and the stress in the reactor coolant system and connecting pipe to be reduced to low levels. This also allows plant conditions to be established for initiation of normal residual heat removal system operation. [Pg.191]

The in-contaimnent refuelling water storage tank provides a heat sink for the passive residual heat removal heat exchanger, which is used to remove decay heat from the core in the event that the steam generators are unable to perform that function. [Pg.206]

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