[en] The 15 MW Heavy Water Research Reactor (HWRR) at CIAE in Beijing is the only neutron source available for neutron scattering experiments in China currently. A new research reactor, China Advanced Research Reactor (CARR), now is being built at CIAE to meet the increasing demand of neutron scattering research in China. A brief introduction to background of HWRR, CARR and the facilities to be installed at CARR has been given in this paper. (authors)

[en] The unique properties of neutrons can be used to reveal the structural and dynamic properties of matter at the micro, mesoscopic and macro-scale. Neutron scattering is widely applied in the fields of physics, chemistry, materials, geology, biology and medicine, which belongs to one kind of national large scale scientific facility. China Institute of Atomic Energy (CIAE) is the first institute to do neutron scattering research in China. Neutron scattering facilities were built based on firstly the Heavy Water Research Reactor (HWRR) and then the China Advanced Research Reactor (CARR), which kept opening to users from other institutes. Many researches were carried out based on these facilities. In this sense, CIAE makes important contributions to the creation, development and application of neutron scattering in China. At present, neutron technique is ushering in new development opportunities. The related application researches become more and more extensive and in-depth. It will continue to provide important technical support for exploring the frontiers of basic science and solving problems in the fields of energy, health, environment and information. (authors)

[en] A reliability analysis for exhaust ventilation system of the control areas in the heavy water research reactor (HWRR) was made based on fault tree approach. The failure rate of the exhaust ventilation system was analyzed. The factors which affect failure rate of the exhaust ventilation system were analyzed. The result indicates that AC bus and maintenance personnel are the main affective factors for the reliability of ventilation system. (authors)

[en] Full text: Following the June 2007 meeting between Dr. Mohamed ElBaradei, IAEA Director General, and Dr. Ali Larijani, Secretary of the Supreme National Security Council of Iran, an Agency delegation, headed by Mr. Olli Heinonen, Deputy Director General for Safeguards, visited Iran from 11-12 July 2007. The purpose of the visit was to draw up a work plan for the modalities for resolving the outstanding issues related to Iran's past nuclear programme and to clarify some present safeguards implementation issues. During the visit, agreement was reached on: the designation of new Agency inspectors; a visit of Agency inspectors to the Heavy Water Research Reactor at Arak by the end of July 2007; and the finalisation of the safeguards approach at the Fuel Enrichment Plant at Natanz during early August 2007. In addition, agreement was reached on the modalities to resolve remaining issues regarding Iran's past plutonium experiments. A dedicated meeting will take place in Iran for this purpose in early August 2007. It was agreed that Iran and the Agency will subsequently embark on clarifying the open issues associated with the scope and content of Iran's enrichment programme, including uranium contamination found on equipment at a specific location, as well as studies related to specified projects. A meeting will take place in Vienna in July 2007 to discuss and finalise the work plan on these issues. (IAEA)

[en] The status and development of prompt gamma neutron activation analysis (PGNAA) were briefly summarized in the paper. The principle of PGNAA was introduced in detail. The international PGNAA facilities, the standardization of PGNAA k₀ method, and a wide range of high energy gamma ray efficiency calibration as well as the application of PGNAA for light elements determination, such as H, B, N, Cl etc., in new materials, environmental samples, biological and mineral samples were emphasized. In addition, a new simple thermal neutron beam facility for PGNAA spectrometer mounted on Heavy Water Research Reactor (HWRR) at China Institute of Atomic Energy was also introduced. (author)

[en] The Heavy Water Research Reactor (HWRR) was constructed and put into operation in 1958 at the China Institute of Atomic Energy (CIAE), located in the suburbs of Beijing. It was the first nuclear reactor in China. The HWRR is a 10 MW multipurpose research reactor and has been operated for 48 years. Because of its long operating history and aged equipment, it is scheduled to be finally shut down by the end of 2007. It has been decided by CIAE to implement a strategy of immediate dismantling after final shutdown. The paper describes the preparation work for the development of the HWRR decommissioning plan at CIAE. The establishment and organization of the project and the problems encountered are described. Progress and problems are addressed. The paper also discusses the measures needed for the successful planning of decommissioning. (author)

[en] The surface temperatures of the radioisotope target capsule is one of the important parameter to its structure integrity. In order to verify the results of theoretical calculation for design, an in-pile surface temperature of capsule wall was measured in Heavy Water Research Reactor (HWRR). The results showed that the temperature were accordant with the theoretical calculation.The measuring methods of the external and internal surface of capsule wall were described also, including instruments selection, the technology of embedded thermocouples and error analysis. (authors)

[en] This book explains technical terms about nuclear fission, reaction of neutron, chain reaction, a basic model of nuclear reactor sort of nuclear reactor, safety of nuclear reactor and a research model of nuclear reactor. It also deals with nuclear power generation like nuclear reactor for generation, structure of nuclear reactor for generation, light water reactor, heavy water reactor, graphitic reactor, safe problems and nuclear reactor, waste out of nuclear power plant and the future of nuclear power generation.

[en] A risk assessment method for reactor decommissioning was established. The method comprises five procedures: source analysis, hazard analysis, frequency analysis, accident consequence analysis and risk analysis. Based on the method, the reactor decommissioning risk assessment system (RDRAS) was developed. 53 situations of the 11 activities that may arise in the HWRR decommissioning process were modeled and calculated with RDRAS to identify the radioactive risk that working staff may face in each situation, and the uncertainties of the results were analyzed. (authors)

[en] To understand the spatial distribution of ¹⁴C discharged from Qinshan nuclear power plant, where two HWRs and four PWRs are on commercial operation, simulation using Gaussian plume model was carried out. The predicted values were compared with the measured ¹⁴C results of moss samples collected in 2010. A good fit was found between these two data sets, indicating that the spatial distribution of ¹⁴C follows a Gaussian model. It can be concluded that HWRs are the dominant ¹⁴C sources at Qinshan site and meteorological influences is the leading factor affecting the distribution of ¹⁴C. (author)