2014-2(11)

Operation of nuclear industry facilities

Article NameExperience of the Novovoronezhkaya NPP at Diagnostics of EDF
AuthorsM.T. Slepov, N.P. Sysoyev
Address

Novovoronezhkaya NPP,
1 Yuzhnaya, Plant zone, Novovoronezh, Voronezh region, Russia 396072
e-mail: nvnpp1@nvnpp1.rosenergoatom.ru

AbstractThis research is devoted to the reliable operation of electrodriving fittings (EDF) as one of important factors of NPP safety. In the article long-term experience of inspection of fittings by department of technical diagnostics of the Novovoronezhky NPP is generalized. For the purpose of diagnosing the current signals of the engines of 832 units of fittings were received when performing the operations "opening" and "closing". Thus, the EDF of blocks №№3,4,5 of Novovoronezhky NPP was surveyed. In the analysis of current signals so parameters as the duration of fittings operation, the difference between the duration of opening and the duration of closing, smoothness of a working course and the duration of the general backlash was determined by current. Discrepancy of these parameters to standard values is treated as a sign of malfunction of the equipment. Authors analyze tendencies of change of the condition of the equipment during 2011-2013. For the fittings which technical condition didn't change towards deterioration, change of category of repair with capital on current is offered. For fittings with natural considerable deterioration of technical condition replacement of procedural current control on capital is offered.
Keywordssafety of NPP, capital repairs, limit switch, finger-tight moment, moving moment, maintenance, electrodriving fittings
LanguageRussian
References
Papers79 - 85
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