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originally developed for Monju to analyze the Na-H2O reaction and reaction product transport behaviors in the cooling systems. Figure 10 shows that the maximum cover gas pressure in the failed IHX is 0.26 MPa and the total mass of reaction products transported to the core is 117 g. The maximum Na void reactivity resulting from the transport of reaction products is estimated as 0.046 $. Consequently, the relief system can safely accommodate the hypothetical Na-CO2 reaction accident caused by the guillotine failure of the heat transfer tube in the IHX. 20 18 16 14 200 180 160 140 (*) CORE (*) Fig. 11 Cover gas pressure and mass of reaction product transportation to the core III.F. Plant Size A plant layout of the indirect cycle system is shown in Fig. 12; a bird’s-eye view of the reactor building is portrayed in Fig. 13.10 The reactor and the primary cooling systems are confined in a rectangular reinforced concrete container, which has a steel liner. The reinforced concrete provides the strength to withstand inner pressure and the steel liner allows gas-leak tightness for containment. Two Na drain-tanks are located under the IHX vessels. A compact power conversion vessel (PCV) including a gas turbine system with an electric generator is installed in the reactor building. The volume of the reactor building including the turbine system is estimated as about 135,000 m3. Figure 13 shows that this volume is about 20% less than that of a conventional Na-core- cooled steam turbine cycle FR. The direct cycle system, for lack of two IHX vessels, has two Na drain tanks and long CO2 pipes connecting the reactor vessel and IHX vessels. Its reactor building volume is about 40% less than that of the conventional cycle FR.9 However, the Na- core-cooled indirect cycle inherits extensive research and development results on design, mockup tests for thermal- 1000 900 800 700 600 500 400 300 200 100 0 0 1800 3600 5400 7200 9000 Time(s) Time (s) 10800 12600 14400 7.0 REACTOR VESSEL b) Indirect cycle DHX e m a a ) )D D i 5 0 1000 2000 3000 4000 5000 6000 Timime e(s()s) Fig. 10 Temperature and pressure transient during the depressurization accident 200 160 120 80 40 5 . 6 No.1 R/D rupture:7.7s 6. 5 5 . i r .5 . 5 . 3 re 55 55 35 ec 5 0.5 0.4 0.3 0.2 0.1 5 #1 Rupture disk breakage: 5 No.2 R/D rupture:14.4s ct tc Fig. 8 Reactor system Fig. 9 Core temperature transient 6 HX cy y c cl l e DHX O.D 1500 00 0 20 40 60 80 6.0 HX VESSEL m PUMP 12 P1:RPVPressureMPa 120 10 P2:CVPressureMPa 100 8 T2:CVTemp.°C 80 6 60 4 40 2 20 00 Rupture disk breakage: 11177g Mass of reaction products Failed HX gas pressure #2 time(s) Time (s) TemTpeemrpaertauturee(de(g°rCee)C) 19.0 m 14.9 m m m 19.3 m 11.0 m Pressure Pressure(MPa) Pressure(MPa) Pressure Mass of reaction products (g) Mass of Reaction Products TempTemrapt.u(°Cre)(°C)PDF Image | ADVANCED ENERGY SYSTEM WITH NUCLEAR REACTORS
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