Passive residual heat removal system PRHRS

Passive Residual Heat Removal System (PRHRS)... 

Decay heat removal Passive Residual Heat Removal System (PRHR) Passive Non-LOCA heat removal... 

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

A scaled-down test facility has been established comprehensive tests using this facility will produce data on the whole system interaction, performance behaviour of the self-controlled pressurizer (PZR), indirect performance effect of passive residual heat removal system (PRHRS), natural circulation effects, etc. 

Besides the inherent safety characteristics of SMART, its safety is further enhanced by highly reliable engineered safety systems. These are designed to function passively on demand and consist of a reactor shutdown system, passive residual heat removal system (PRHRS), emergency core cooling system (ECCS), safeguard vessel, reactor overpressure protection system (ROPS) and containment overpressure protection system (COPS). 

PRHRS Passive residual heat removal system... 

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)...

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. 

The safety analysis of the TMSR-SF has also drawn much attention. Three types of transient conditions including ULOF, UOC, and UTOP were examined on the TMSR-SF by an FHR safety analysis code named the FHR Safety Analysis Code (FSAC Xiao et al., 2014). The station blackout anticipated transient without scram (SBO-ATWS) accident was analyzed by the modified RELAP5/MOD 4.0 code with the responses of the passive residual heat removal (PRHR) system (Jiao et al., 2015). 

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