[en] Considering the various health and safety related electrical equipments and control systems in the reprocessing plant, it is essential that the design of distribution network ensures safety and reliability of the highest order. On the basis of first hand experience gained during construction, operation and maintenance of the existing reprocessing plants, it has been possible to formulate a design criteria and a quality assurance programme for development of the distribution network. The paper deals with the following steps of development and construction of the distribution network : design criteria, design tools, technical specifications, and quality surveillance programmes. (author). 5 refs

[en] Like any other electrical equipment insulation, insulation systems of a rotating machine also need to meet operating requirements such as thermal, electrical, chemical and environmental nature. The electrical insulation system, being less robust than the mechanical component, is the most vulnerable part that undergoes ageing when exposed to the complex stress environment during its operation. The innovation in the insulation system of the rotating machine has come in terms of development of better insulating materials, manufacturing process and evaluation technique during manufacture and on the end product. This paper covers an overview of the specific requirement of insulation system vis-a-vis development in the insulation material, testing and monitoring methods. (author)

[en] High efficiency particulate air (HEPA) filters have been extensively used worldwide over the years for various nuclear applications. This paper describes design concept of various HEPA filter configurations developed world over including India in recent years for increasing of collection efficiency, arrestance of finer pariculates, extension of service life, suitability of remote handling and compactness for easier waste disposal. (author). 4 refs., 6 figs

[en] The symposium was held when various utility systems, integral and peripheral to industries and organizations undergone a significant advancement in the recent years to cope with the stringent requirements of operating conditions, energy conservation and reliability. The concept of multidisciplinary approach for operating and designing these utility systems have been proved successful to meet demand of ever growing and complex processes. Keeping this in view, the subjects of the symposium were diversified in few major areas like mechanical and electrical systems, control and instrumentation, energy conservation and safety. 73 papers were included in the proceedings

[en] The Class 3 system is a basic requirement in all nuclear installations. Selection of this major equipment plays an important role in the overall performance and reliability of the whole system. The paper deals with the choice of alternator, rating, its auxiliaries along with control and protection requirements. (author). 3 refs., 4 figs

[en] High voltage and medium voltage power cable and control and instrumentation cables constitute a major source of inventory as fire load in nuclear power stations. To contain the fire and not to allow it to spread to other area, fire barriers have been provided at NAPP (Narora Atomic Power Project) at all cable penetrations. As the PVC insulated cabling system at NAPP was installed much before the availability of fire retardant and fire survival cables, fire load on account of PVC is quite large. Fire barriers, smoke detectors, early warning fire alarm system and fire fighting system provide at NAPP go a long way to counter the threat of damage due to fire. The article attempts to give a brief description of different types of fire barriers adopted at NAPP and the fire barrier system available indigenously as well as abroad for adoption in nuclear power stations. (author). 3 figs

[en] Dhruva standby power supply system consists of 3 nos of diesel generator (D.G.) sets, and the capacities are selected so as to meet the requirements of redundancy, testability and maintainability. The paper describes the detail of the D.G. sets and modifications carried out later on. Also a brief reference is made on some of the criteria given by IEEE specification for D.G. units for NPGS. The paper suggests some of the improvements that can be thought of for future schemes. (author). 2 refs

[en] Facility ventilation system on once through basis is normally recommended and followed for highly radioactive plutonium laboratories generating particulate matter. However recirculatory ventilation system is economical from the point of view of both capital and operational costs. Further, significant energy saving will also be achieved. The present paper discusses the philosophy related to recirculatory ventilation system from engineering and radiation safety points of view and highlights the modifications required to be made in the once through ventilation system suitable for operation in recirculatory mode. (author). 4 refs., 4 tabs., 3 figs

[en] With the advent of microprocessor, digital signal processing has become very convenient and economic. Hence, microprocessor based distributed supervisory control and data acquisition (SCADA) would be appropriate for automation for interlock, protection and sequential operation of the offsite packages in modern nuclear power plant. The need for monitoring of some vital parameters of the offsite packages are being felt in the operation of nuclear power plants since lack of some of these vital information had led to loss of units, unsafe or inefficient operation. Bearing in mind the locations of the various offsites, a geographically distributed architecture is conceived consisting of decentralised intelligence networked with high speed communication link. The system shall be modular with future upgradeability. (author). 3 figs

[en] Commissioning of the electrical system of the Narora-2 reactor is described. Some of the major incidents during this stage were : (1)failure of SVT-2 lighting arrester, (2)rupture of 6.6 KV intertie cable, (3)thyrister malfiring, (4)overcharging of 250V DC control battery bank, (5)damage of cards of 100 KW charger, and (6)failure of tap changer of 5231-TR2. Actions taken to solve these problems are described