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STUDY AND ANALISYS OF DEGRADATION PROCESSES IN THE ELECTRONIC EQUIPMENT OPERATING AT KOZLODUY NPP

A. Popov1,* , N. Naydenov2

Affiliation

  1. Sofia University "St. Kliment Ohridski", Faculty of Physics, 5 James Baucher blvd., Sofia 1164, Bulgaria
  2. Kozloduy Nuclear Power Plant (NPP), Bulgaria

Abstract

The electronic equipment for control and monitoring of different systems on Units 5 and 6 of Kozloduy NPP has been studies for identification of degradation processes, occurring during its long use under the conditions of monitored radiation background in accordance with the radiation safety norms for the plant. For this purpose operating electronic units have been selected, and active components, such as diodes, transistors and integrated circuits, have been disassembled and their main parameters have been measured. By comparison with the parameters of the same components from non-operated equipment, it has been found out that some changes occur which may impact the functionality of the electronic equipment. The most sensitive factor for the diodes is the ideality factor and for the transistors these are the current transfer constant h21 and the collector current . A theoretical model has been developed by means of which the equipment lifetime forecast can be made depending on the duration and intensity of the operation..

Keywords

Nuclear Power Plant (NPP), Diodes, Transistors, Electronics, Degradation.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

A. Popov, N. Naydenov, STUDY AND ANALISYS OF DEGRADATION PROCESSES IN THE ELECTRONIC EQUIPMENT OPERATING AT KOZLODUY NPP, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 321-324 (2005)