Nuclear Production of Hydrogen, Fourth Information Exchange ...
Nuclear Production of Hydrogen, Fourth Information Exchange ... Nuclear Production of Hydrogen, Fourth Information Exchange ...
PROPOSED CHEMICAL PLANT INITIATED ACCIDENT SCENARIOS IN A S-I CYCLE PLANT COUPLED TO A PEBBLE BED MODULAR REACTOR Nomenclature t F V C D A k g c P 0 D 0 Time after leak starts, seconds Fraction of initial gas weight remaining in vessel at time t Volume of the source vessel Coefficient of discharge Area of the source leak Specific heat ratio Gravitational conversion factor (for English units) Initial gas pressure Initial gas density References Bird, R.B., W.E. Stewart, E.N. Lightfoot (1960), Transport Phenomena, Wiley, New York. Brown, L.C., et al. (2003), High Efficiency Generation of Hydrogen Fuels Using Nuclear Power, Technical report, General Atomics Corp. Brown, N.R., et al. (2009), “Analysis Model for Sulfur-Iodine and Hybrid Sulfur Thermochemical Cycles”, Journal of Nuclear Technology, 166, 43-55. Reitsma, F. (2004), PBMR-268 Neutronics and Transient Benchmark Problem, PBMR Ltd., South Africa. Seker, V., T.J. Downar (2005), “Analysis of the OECD/NEA PBMR-268 Transient Benchmark Problem with the PARCS Neutronics Code”, American Nuclear Society TRANSACTIONS, 92, 697-699. 386 NUCLEAR PRODUCTION OF HYDROGEN – © OECD/NEA 2010
CONCEPTUAL DESIGN OF THE HTTR-IS NUCLEAR HYDROGEN PRODUCTION SYSTEM Conceptual design of the HTTR-IS nuclear hydrogen production system: Detection of the heat transfer tube rupture in intermediate heat exchanger H. Sato, N. Sakaba, N. Sano, H. Ohashi, Y. Tachibana, K. Kunitomi Japan Atomic Energy Agency, Japan Abstract One of the key safety issues for nuclear hydrogen production is the heat transfer tube rupture in intermediated heat exchangers (IHX) which provide heat to process heat applications. This study focused on the detection method and system behaviour assessments during the IHX tube rupture scenario (IHXTR) in the HTTR coupled with IS process hydrogen production system (HTTR-IS system). The results indicate that monitoring the integral of secondary helium gas supply would be the most effective detection method. Furthermore, simultaneous actuation of two isolation valves could reduce the helium gas transportation from primary to secondary cooling systems. The results of system behaviour show that evaluation items do not exceed the acceptance criteria during the scenario. Maximum fuel temperature also does not exceed initial value and therefore the reactor core was not seriously damaged and cooled sufficiently. NUCLEAR PRODUCTION OF HYDROGEN – © OECD/NEA 2010 387
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CONCEPTUAL DESIGN OF THE HTTR-IS NUCLEAR HYDROGEN PRODUCTION SYSTEM<br />
Conceptual design <strong>of</strong> the HTTR-IS nuclear hydrogen production system:<br />
Detection <strong>of</strong> the heat transfer tube rupture in intermediate heat exchanger<br />
H. Sato, N. Sakaba, N. Sano, H. Ohashi, Y. Tachibana, K. Kunitomi<br />
Japan Atomic Energy Agency, Japan<br />
Abstract<br />
One <strong>of</strong> the key safety issues for nuclear hydrogen production is the heat transfer tube rupture in<br />
intermediated heat exchangers (IHX) which provide heat to process heat applications. This study<br />
focused on the detection method and system behaviour assessments during the IHX tube rupture<br />
scenario (IHXTR) in the HTTR coupled with IS process hydrogen production system (HTTR-IS system).<br />
The results indicate that monitoring the integral <strong>of</strong> secondary helium gas supply would be the most<br />
effective detection method. Furthermore, simultaneous actuation <strong>of</strong> two isolation valves could reduce<br />
the helium gas transportation from primary to secondary cooling systems. The results <strong>of</strong> system<br />
behaviour show that evaluation items do not exceed the acceptance criteria during the scenario.<br />
Maximum fuel temperature also does not exceed initial value and therefore the reactor core was not<br />
seriously damaged and cooled sufficiently.<br />
NUCLEAR PRODUCTION OF HYDROGEN – © OECD/NEA 2010 387
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