[en] Problems of components ageing widespread exist in nuclear facilities and necessity of research for components ageing control were pointed out. A tactics of which carry out gradationally components ageing research and the research train of thoughts for every gradation were inquired into. Also feasibility of carrying out research for components ageing control by method of 'Life Cycle Assessment, LCA' was probed into

[en] The author discusses on the necessity of carrying out regularization control in designing and constructing the 10 MW high temperature gas-cooled reactor (HTR-10), from the requirement of nuclear safety, of technical feasibility, of economical feasibility and accumulating developmental experiences. The author expounds taking some effective measures in the practice of carrying out regularization control on HTR-10. These measures include laying down design control procedures, working out HTR-10 design criteria according to current codes and standards, carrying on regularization design, regularization control of design documents and drawings, and according to quality assurance programs and procedures carrying on regularization control, for ensuring engineering progress and quality. It has universality for regularization control of nuclear engineering projects design and construction. The author also provides some beneficial use of reference for later nuclear engineering design and construction

[en] Experience with the 10 MW high temperature gas-cooled reactor (HTR-10) was reviewed to standardize control of the test reactor. Organizational emphases and awareness of standardizations are necessary prerequisites for nuclear engineering standardization control. The author analyzes standardization control measures in the design stage, the manufacture stage and the construction stage for HTR-10. Engineering experience indicates that carrying out standardization control in nuclear engineering projects is a key method for ensuring engineering quality and progress and improved economic benefits. The conclusions provide a reference for other nuclear engineering research reactors to improve nuclear engineering standardization control

[en] A control-rod position detector with reed switches and coding-bars, which possesses a simple structure, reliable operation and high precision, is developed in this paper. For detecting N steps of a control-rod position, the detector is composed of a reed switch assembly and a core which contains k arrayed coding-bars. The switch assembly has k reed switches which are arranged on the same plane annularly averagely and each bar is composed of several permanent magnet portions which are inlaid regularly on the surface of the core. As the control rod is withdraw, the coding bars move in the center of the switch assembly, while the permanent magnet portions make the switches open and close regularly. So the control rod position can be judged by picking up and processing the outputs of the resistance which is in series with the reed switches. (authors)

[en] The main feedwater pump frequency-doubled vibration occurred in Tianwan NPP units 3 and 4 in the process of commissioning. The frequency-doubled is approximately equal to the three times frequency of the pump structure according to the result of modal test. The three times frequency of the pump structure is increased by reinforcing the pedestal of the main feedwater pump. According to the test result, the vibration of the bearing pedestal is reduced obviously. The reinforcement results in good effect. (authors)