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Volume 26, Issue 12
Displaying 1-7 of 7 articles from this issue
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Toshiro ANDO, Mitsuru OHTA, Konomo SANOKAWA1984 Volume 26 Issue 12 Pages 1020-1024
Published: December 30, 1984
Released on J-STAGE: January 08, 2010
JOURNAL FREE ACCESSDownload PDF (363K) -
Yoshio IDE1984 Volume 26 Issue 12 Pages 1025-1028
Published: December 30, 1984
Released on J-STAGE: April 21, 2009
JOURNAL FREE ACCESSDownload PDF (286K) -
Nobuhide SUDA1984 Volume 26 Issue 12 Pages 1029-1036
Published: December 30, 1984
Released on J-STAGE: April 21, 2009
JOURNAL FREE ACCESSA review is made on the application of the simulation technology in the field of the reactor engineering. Simulation technology in a wide sense is classified in four types: (a) solid model used in earthquake-proof tests, loss-of-coolant tests and so forth, (b) model based on physical ana1ogy such as reactor simulator by optical analogy, (c) analog computer simulation and (d) digital computer simulation. There is a variety in the purpose of the simulation: prediction of various phenomena such as power distribution and fuel burnup, training of the operators, safety analysis and so forth. The role and importance of digital computer simulation is increasing, and the development of more sophisticated display, such as computer graphics, as well as faster computer by means of parallel processing is being pursued.View full abstractDownload PDF (4715K) -
Kanji TASAKA, Yoshio MURAO, Yasuo KOIZUMI1984 Volume 26 Issue 12 Pages 1037-1055
Published: December 30, 1984
Released on J-STAGE: April 21, 2009
JOURNAL FREE ACCESSJapan Atomic Energy Research Institute has investigated loss-of-coolant accident (LOCA)/ emergency core cooling system (ECCS) from 1970. Major results of the LOCA/ECCS research are summarized in this report. ROSA-II program was LOCA/ECCS research for a pressurized water reactor (PWR) and ROSA-III program was for a boiling water reactor (BWR). The both test facilities were scaled at approximately 1/400 of the respective reference PWR and BWR. Large scale reflood test is research on reflood phenomena during a large break LOCA of PWR. The test facility is scaled at approximately 1/20 of the reference PWR and the research is still being continued.View full abstractDownload PDF (1229K) -
Naozo HATTORI, Kenji HAYASHI1984 Volume 26 Issue 12 Pages 1062-1071
Published: December 30, 1984
Released on J-STAGE: April 21, 2009
JOURNAL FREE ACCESSAn experimental investigation is made of the friction factor for fully developed turbulent sodium flow in small smooth tubes. Pressure drop for single and double tubes is measured by means of NaK pressure transducers, under several sets of conditions of fluid flow, temperature and metallic impurity.
From the results obtained it is found that the friction factor-Reynolds number relationships for the small tubes vary fairly with the operating time of the sodium loop (about 1, 260-4, 100h). The primary cause of the characteristic change is the deposition of fine metallic impurities on the tube surfaces.View full abstractDownload PDF (1408K) -
Seiji NISHIMURA, Sachio SHIMADA, Masayuki NAGAI, Kagetaka AMANO, Genki ...1984 Volume 26 Issue 12 Pages 1072-1082
Published: December 30, 1984
Released on J-STAGE: April 21, 2009
JOURNAL FREE ACCESSTo predict the response of Zircaloy-2 cladding tube in an iodine environment, a model of the stress corrosion cracking (SCC) process has been developed based on fracture mechanics. At first, SCC tests of Zircaloy-2 plate were performed at 250-390°C in iodine vapor to measure the crack growth rate da/dt and the threshold stress intensity factor for SCC growth KISOO. Tests were carried out using a WOL (Wedge Opening Loading) fracture mechanics specimen. The da/dt was shown to be da/dt=CKn, where K is the stress intensity factor and C and n are experimental constants. C, n and KISOO could be expressed as a function of temperature. Secondary, internal gas pressurization SCC tests for Zircaloy-2 cladding tubes were performed at 400°C to measure time to failure at various hoop stresses.
The stress intensity factor of semi-elliptical cracks, which were produced in the cladding tubes, was calculated by a three-dimensional FEM (Finite Element Method) to analyze the crack growth rate as a function of K. Comparison of experimental results with those calculated using the developed SCC fracture process model showed good agreement.View full abstractDownload PDF (579K) -
Drying and Powdering of SuspensionKooichi CHINO, Hideo YUSA, Fumio KAWAMURA, Susumu HORIUCHI, Masaru HAY ...1984 Volume 26 Issue 12 Pages 1083-1088
Published: December 30, 1984
Released on J-STAGE: April 21, 2009
JOURNAL FREE ACCESSPowdering characteristics of a thin film dryer are studied experimentally and theoretically for dryer application to solutions and suspensions. In a previous paper a powdering model for solutions was proposed and fairly good agreement was obtained between calculated and experimental results with Na2SO4 solution. In this paper, the powdering model is improved to apply to suspensions and mixtures of solution and suspension. Ion exchange resin and filter aid are selected as examples of suspensions, and Na2SO4 of solution. The critical condition for the powdering process is expressed by a theoretical equation derieved from experiments. The calculated results of the improved model agree well With experimental values. It is found that kinematic viscosity is the most important physical property in the powdering Process and the kinematic viscosity of the mixture can be evaluated as the weighted average of its component kinematic viscosities. An automatic oontrol system, which was applied to the results of the powdering model, was designed and successfully demonstrated.View full abstractDownload PDF (346K)
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