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[en] Replacement of ex-core neutron flux measurement system AKNT-2 at Bohunice NPP was finished at Unit 3 in 2007 and at Unit 4 in 2008. The previous system was replaced by new system AKNT-17R. Neutron power on-line calibration system AKE-02R was installed at Unit 3 in the last year 2008. AKE-02R was working in open-loop till to end of fuel cycle. AKE-02R system was also installed at Unit 4 during outage in 2009 (July 2009). The purpose of AKE-02R system is to increase ex-core neutron flux measurement accuracy. Ex-core neutron flux measurement is strongly dependent on control rods group 6 position (radial and axial power distribution in the core) and coolant inlet temperature. AKE-02R system eliminates these dependencies by using correction factors, determined on the basis of real control rods position, real coolant inlet temperature and real burn-up. In this paper brief description of AKNT-17R system and AKE-02R system is presented. Step by step is explained the whole process of AKE-02R commissioning at Unit 3. Presented are all performed experiments and the results of the experiments during power commissioning in 2008 (coolant inlet temperature change, control rod group 6 position change, etc.) and during whole actual fuel cycle up to now. Some results from commissioning at Unit 4 that was performed last month are also presented. (Authors)
Source
Vidovszky, I. (Kiadja az MTA KFKI Atomenergia Kutatointezet, Budapest (Hungary)); Paks NPP Ltd., Paks (Hungary); KFKI Atomic Energy Research Institute, Reactor Analysis Laboratory, Budapest (Hungary); VUJE, Inc., Trnava (Slovakia); Russian Research Center 'Kurchatov Institute', Moscow (Russian Federation); Nuclear Research Institute Rez plc, Husinec-Rez (Czech Republic); Skoda JS a.s., Plzen (Czech Republic); Fortum Nuclear Services Ltd., Vantaa (Finland); Kozloduy NPP plc, Kozloduy (Bulgaria); FSUE OKB 'GIDROPRESS', Moscow region, Podolsk (Russian Federation); [533 p.]; ISBN 963-372-640-2; 
; Oct 2009; p. 1-9; 19. atomic energy research symposium on WWER reactor physics and reactor safety; Varna (Bulgaria); 21-25 Sep 2009; 8 figs.; 6 refs.
; Oct 2009; p. 1-9; 19. atomic energy research symposium on WWER reactor physics and reactor safety; Varna (Bulgaria); 21-25 Sep 2009; 8 figs.; 6 refs.