ECHAP SMR ADAPT A MBK X

PDF	ECHAP SMR ADAPT A MBK X-POWER ECHAP SMR ADAPT A MBK X-POWER Echappement référence : ECHAP723 homologué CEE DIRECTIVE 97/24 - n° e997/241071*01 INSTRUCTIONS PIECES INCLUSES DANS LE

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Comparison and Analysis on Integral Small Modular Reactor

Small Modular Reactor (SMR) with an electric power less than 300MWe has gained much attention in recent years By incorporating the safety-by-design and passive concept into the design process SMRs have made a progress in meeting the safety demand of nuclear energy There are many similar design features among integral pressurized water SMRs and

ABSTRACT

Small Modular Reactor (SMR) with an electric power less than 300MWe has gained much attention in recent years. By incorporating the safety-by-design and passive concept into the design process, SMRs have made a progress in meeting the safety demand of nuclear energy. There are many similar design features among integral pressurized water SMRs, and

INTRODUCTION ON SIMULATION MODEL

In this section, a brief introduction on the simulation model will be conducted. The introduction contains three parts, and they are model introduction, design parameters and design assumptions. glc.ans.org

2.1. Introduction of Simulation Model

As is discussed in the former section, integral SMRs share a lot of similar design features. These features origin from similar design principles, which at one hand enhance the reactor resilience, and at another facilitate easy use of many passive safety features [6]. Fig. 1 shows two simplified integral SMR simulation models. In these two cases, p

case2

PRHRS HX UHS Figure 1. Schematic Diagram of Two Model Cases. In reference with the design of W-SMR, ESF in case1 is connected to the primary side of coolant circuit, and a few simplifications have been conducted on the simulation model, such as the design of passive safety system and passive recirculate system. As in case1, for the reason of high

2.3. Assumptions in Simulation Model

In this paper, the analysis is focused on comparison of different performance in SMR model with two different ESF design. For the sake of simplifying the issue, the primary and secondary coolant systems and the ESF design are simulated with a lot of simplifications. glc.ans.org

2.4. Summary

The aim of this paper is to draw some general conclusions instead of solving practical engineering problems, thus the simulation model is rather simple. However, with all major features of SMR included, the simulation model can fulfil the requirement of analysis, and could provide us confidential results. 3. glc.ans.org

RESULTS AND DISCUSSIONS

After the simulation model operates stably for an enough of time, station blackout accident and SBLOCA is separately introduced. After a few seconds delay, ESF comes into function. During the whole accident calculation time, both two cases function well. However, there are still many differences between them, and a careful analysis is worth doing t

3.2.1. Case1 responses to SBLOCA

The response process to SBLOCA in case1 is very similar to that of blackout accident. Both two processes have same three parts, and with same division criterion. To be brief, in the following part, we neglect the similarities, and only focus on analyzing some distinctive characteristics in the SBLOCA performance. In primary side, with the coolant f

3.3. Comparisons on Performance in Different Accidents

A comparison on the performance in different accidents of two cases is done separately in the following part, and the major differences are pointed out. glc.ans.org

3.3.2. Case2

The SBLOCA simulation model only adds with CMT and break, but the whole response changes a lot compared to blackout results. Before the valve under CMT opens, break has little influence on primary coolant flow in SBLOCA, and the performance of blackout and SBLOCA is similar to each other, except for the occurrence of pressure drop and coolant outfl

4. CONCLUSIONS

The results drawn from two cases under different scenarios show that, the two kinds of ESF designs could both meet the demands for keeping reactor safe, which specifically removes residual heat in blackout accident, and keeps reactor core covered for enough time. Some general conclusion can be summarized from former discussion, that in case1, PRH

ACRONYMS

SMR ESF RPV SBO HX PRHRS SBLOCA OTSG Small Modular Reactor Engineered Safety Feature Reactor Pressure Vessel Station Blackout Heat Exchanger Passive Residual Heat Removal System RCP PRZ UHS glc.ans.org

MSLV MFLV

Small Break Loss of Coolant Water Accident Once-through Steam Generator glc.ans.org

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