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Cryogenic Technology Review of Cold Neutron Source Facility for Localization DISCLAIMER

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Cryogenic Technology Review of Cold Neutron Source Facility for Localization DISCLAIMER KAERl/CM-204/97 ~ RIU74 ———. Development of the Cold Neutron Source Cryogenic Technology Review of Cold Neutron Source Facility For Localization DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. KAER1/CM-204/97 g~gxt~ Jlg Development of the Cold Neutron Source Cryogenic Technology Review of Cold Neutron Source Facility For Localization 1998. 2.28. (J- I. xl %- -i- I ... – 111– –v– –vi– – vii - ... – Vlll – I I I I I 1 I 4. 3%2]%’ II /1 // –i~- –x– – xii – ... – X111- – xiv – SUMMARY I. Project Title Cryogenic Technology Review of Cold Neutron Source Facility for Localization 11, Objective and Importance of the Project Tilf2 concept design for cold ~eutmn so~rce facility of HALNARO was completed as the first step. Before the basic and detailed designs proceed further, local technology environments as well as the safety and licensing of facility should be investigated to ensure viable and successful installation and to examine the potentiality of localization. CNS facility includes the sophisticated cryogenic, gas control and vacuum technology, Gas control and vacuum technology, together with semiconducting industry, have developed highly. However, despite the Pact that cryogenic technology including helium refrigerator and cryogenic assembly, the core parts of CNS, is one of the main branches of the 21st century’s cutting technology, systematic research group is not even established domestically. The purpose of this R&D is to investigate, compare and examine the domestic and the advanced countries’ CNS facility technologies, to –xv- determine the field of technology to be imported from the advanced countries and the possible field of localization, to actively induce the participation of the domestic specialists, to secure a leading role for the domestic specialists in the installation of CNS facility, and to eventually foster the development of local technology through the technology transfer and R&D. HI. Contents and Scope of the Project This R&D, which examines the technology of HANARO CNS facility, and the potentiality of installation by designing and manufacturing domestically, as well as reviewing the safety and licensing of the reactor, consists of PART I. Local cryogenic technology for CNS facility, and PART II. Safety and licensing of CNS facility. In PART I, the technology of CNS facility is reviewed with respect to cryogenic and warm part separately, with reference to the concept design report of CNS done by PNPI of Russia in corporation with KAERI and the examination report by technicatome of France. The local cryogenic equipments being developed in companies, government funded research institutes and universities are investigated extensively and the level of local cryogenic technology is examined. The technology of CNS installed in NIST of U.S.A. and Kyoto university of Japan is investigated in depth. The cryogenic companies of U.S.A., Japan and Europe are also investigated and the level of technology is examined. Further, the level of local CNS technology, cryogenic part such as helium refrigerators, vacuum insulated – xvi – pipes, condenser, cryogenic fluid tubes and moderator cell, and warm part such as gas control, vacuum and gas analysis, are compared with that of the advanced countries, which will serve as a reference to determine whether localization plan for HANARO CNS facility is viable. In PART II, the safety standard in domestic nuclear power regulations is compared with that of the foreign countries, and the relative relations with the sa’fety of HANARO reactor is examined. The necessary safety conditions for CNS facility design are investigated and elements of possible accidents are analyzed, compared with similar elements “of other facilities. The system failure and its influence are also examined. In addition, the licensing method for HANARO CNS facility is discussed, based on the review of current domestic licensing system and comparisons with examples of foreign countries. IV. Results PART I. Review of Domestic Cryogenic Technology for CNS facility CNS facility consists of cryogenic and warm part. Cryogenic part consists of a helium refrigerator and vacuum insulated pipes outside a reactor and a condenser, a cryogenic fluid tube and moderator cell inside or outside a reactor. The warm part consists of hydrogen gas line such as a hydrogen buffer tank, gas control equipments and a gas analyser, the safety and thermal insulation part such as nitrogen and helium gas supplying systems, and vacuum system. Therefore, sufficient level of - xvii - cryogenic, gas control and vacuum technology are necessary to localize CNS facility. 1. Current status of domestic cryogenic technology Daesungsanso co., ltd. and Korea gas corporation are the on]y companies which perform R&D specialized in designing and manufacturing cryogenic equipments. Other than those, there are some companies in this field, but their sizes are small and they lack sufficient level of technology. Cryogenic research institute of Daesungsanso co., ltd performs R&D to localize the main facility, the so-called air separation unit, producing industrial gases, as well as a variety of equipments. They have developed vacuum insulated pipes, cryogenic valves, cryogenic gas pumps, LGC and cryogenic tanks. They are now developing a pulse tube refrigerator and low temperature cryostat. They also poses a lot of know-how and capability in the areas of cryogenic process calculations, design and manufacture through many years of R&D. Korea gas corporation established the R&D center to do research and development of LNG equipments, as a government funded company which imports and distributes LNG. They succeeded to develope membranes, which are used in the inner vessels of LNG storage tanks, and now are on the process of planning to manufacture their own LNG storage tank. CVE is manufacturing passive cryogenic equipments, on ordering basis, such as liquid helium cryostat and vacuum vessel Basic research in cryogenic temperature is being conducted actively in government funded research institutes. Many government funded research ... - Xvlll - institutes keep superior specialists and high technology equipments in cryogenics and conduct sophiscated researches in the fields of cryogenic properties of materials, superconductors, MRI, cryogenic refrigerators. Korea institute of machinery and materials has developed small size refrigerators such as GM refrigerators, GM/JT refrigerators, cryopumps, pulse tube refrigerators. Korea institute of science and technology has develo~ed S“tirling refrigerators and recently has undertaken to develope hydrogen liquefying system and storage tank for hydrogen which attributes clean energy as well as alternative energy in the future. Korea electrotechnology research institute developes cryogenic equipments to commercialize MRI magnets and superconductors. Korea basic research center, a branch of Korea standard research institute, is developing a dilution refrigerator which is a high-tech cryogenic equipment. Current research status of universities is very weak compared with industrial companies and government funded research institutes. The research of universities is being done in physics and mechanical engineering departments, but it remains at a basic level except for superconductor research, because of limited research funds and shortage of researchers. Recently, the number of researchers in cryogenic field is increasing because the importance of liquid hydrogen, LNG and cryogenic refrigerators is recognized. Unlike cryogenic part, the technology of warm part is at a considerably high level as a result of the extensive effort of many companies, due to the domestic boom of semiconductor industries and the expansion of international semiconductor market. Also, there are many companies with high technology manufacturing storage tanks and pipe lines. Therefore, there is a good possibility to localize warm part of CNS facility. Even though it is already recognized that cryogenic technology will be the important base of the cutting-edge science in the 21st century, a very limited number of companies is involved in doing R&D since this fact is not re~ogniied generally and the domestic market is small. Even though it is fortunate that government funded research institutes and universities realized recently the importance of cryogenic technology, which is well behind that of the advanced countries, the interest and investment of government and companies are disparately needed. 2. The estimation of the localization potentiality for CNS facility The potentiality of localization is examined based on the technological capability of each research institute in regards to each part of CNS facility, and the result is presented in table 3-12-1 and table 3-12-2. Assuming that the technology of CNS facility consists of basic process calculations, design according to calculations, manufacturing, construction and installation, it is possible to do locally construction, installation, and a part of design and manufacturing. While almost all the parts of warm part are possible to localize, cryogenic part ‘is well behind the advanced countries. Therefore, important parts such as a helium refrigerator and a heat exchanger should be imported, and we need a R&D effort to localize a cryogenic fluid tube and a moderator cell. –xx– 3. CNS facility & current status of cryogenics of advanced countries NIST in U.S.A. and Kyoto university in Japan use the similar
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