[en] Short communication

[en] As part of a programme of cooperation with Central and Eastern European states, a technical system has been established for the Zaporozhe nuclear power plant, which complements existing operational checking and monitoring facilities with modern means of information technology. It makes it possible to continuously monitor the state of the units in normal operation and in cases of anomalies or incidents. The parameters selected for monitoring are listed, and the system of automatic evaluation at the power plant site is described in detail. Test operation of the technical system started in late 1995 and the industrial testing phase in mid-1996. (A.K.)

[en] The results of calculation of the transient process due to failure of 2 out of the 4 main circulation pumps during reactor unit operation at full power were compared with observed data that emerged from a dynamic test. The calculation encompassed 350 s of the process. The largest differences in the reactor unit behavior concerned the secondary circuit parameters, due to the fact that the pressure in the secondary circuit affects the coolant pressure in the primary circuit. (M.D.). 30 figs., 5 refs

[en] The IAEA Assessment of Safety Significant Events Team (ASSET) report presents the results of an ASSET team's assessment of their investigation of the effectiveness of the plant for prevention of incidents since 1990 at Zaporozhe nuclear power plant. The results, conclusions and suggestions presented herein reflect the views of the ASSET experts. They are provided for consideration by the responsible authorities in Ukraine. The ASSET team's views presented in this report are based on visits to the plant, on review of documentation made available by the operating organization and on discussions with utility personnel. The report is intended to enhance operational safety at Zaporozhe by proposing improvements to the policy for the prevention of incidents at the plant. The report includes, as a usual practice, the official response of the operating organization as well as of the regulatory body to the ASSET recommendations. Figs

[en] Technical and economic analysis of mounting the reactor buildings of NPPs with WWER-1000 reactors which are under construction is performed. Cutting of buildings into mounting elements of different size is considered. Mounting schemes of Zaporozhskaya, Kalininskaya, Balakovskaya and Tatarskaya NPPs are shown taking reactor building sealed zone, containment, socle part and building as examples

[en] A technical system to improve operational monitoring was designed and established in 1992 as a pilot project in the Zaporozhe nuclear power plant. The technical system complements the existing operational checking and monitoring facilities by including up-to-date information technology. The monitoring tasks are related to: general plant condition, barrier effectiveness, radioactivity inventories, release of radioactive substances into the air, immissions into buildings and surroundings, recording of meteorological conditions, release of radioactive substances into the water, adherence to monitoring-specific threshold values and plant condition in the event of anomaly or incident/accident. Based on the concept of protection aims and monitoring tasks, 49 different safety related operational parameters of the core and unit, 18 radiological parameters of the unit and the plant site, and 6 meteorological parameters are permanently and automatically monitored, recorded and evaluated. (M.D.)

[en] As part of the programme implemented by the German Ministry of Environment, Nature Conservation and Reactor Safety to cooperate with the Central and Eastern European States (CEES) and the Commonwealth of Independent States (CIS) in the area of nuclear safety, a technical system to improve operational monitoring has been designed, specified and established since 1992 as a pilot project in the Zaporozhye/Ukraine nuclear power plant by Forschungszentrum Rossendorf and Technischer Ueberwachungsverein Rheinland with a significant contribution from the State Scientific and Technical Centre of the Ukrainian supervisory authority. The technical system complements existing operational checking and monitoring facilities by including modern means of information technology. It enables a continuous monitoring of the state of unit 5 in normal operation and in cases of anomalies or incidents so that when recognisable deviations from the regular plant operation occur, the Ukrainian supervisory authority can immediately inquire and if necessary impose conditions on the operator. The radiological and meteorological parameters at the nuclear power plant location are monitored to the extent necessary to assess the current radiation situation and to implement efficient emergency management measures. (orig.)

No abstract available

No abstract available

[en] In the paper a Technical System is described to improve the operational monitoring of a nuclear power plant equipped with the standardised VVER-1000/320 reactor type is described. A pilot project of this system in Zaporozhye NPP unit 5 has been started in 1992. The monitoring tasks are mainly directed to operational parameters but include in accordance to international experiences the radiological parameters as well as the meteorological. The monitoring concept based on protection objectives and related control tasks, the resulting selection of monitored parameters, the structure of the monitoring system, the automatic evaluation of the process and of components by comparison of the actual values of the selected parameters with monitor-specific limit values as well as the classification of the evaluation results into the information levels Notice, Warning and Alarm are explained. The operational testing period of the system has been started in summer 1996. (orig.)