EVALUATION OF EXPERIMENTAL UNCERTAINTY OF PHYSICAL MEASUREMENTS BASED ON START-UP DATA OF THE LATEST VVER-1000 PLANTS
24th Symposium of AER on VVER Reactor Physics and Reactor Safety (2014, Sochi, Russia)
Core surveillance and monitoring
Abstract
EVALUATION OF EXPERIMENTAL UNCERTAINTY OF PHYSICAL MEASUREMENTS BASED ON START-UP DATA OF THE LATEST VVER-1000 PLANTS
Tsyganov S., Kravchenko A., Kraynov Yu., Nasedkin A., Chmykhun V. NRC “Kurchatov Institute”, Moscow, Russia
ABSTRACT
During 2000-th several new VVER-1000 units of different projects have been commissioned. At some of them, the similar initial fuel loadings were implemented; physical start up tests programme for measuring neutron-physics characteristics were also almost similar.
The paper presents the analysis of some result of neutron-physics characteristics were carried out during physics start up of VVER-1000 units that had similar initial fuel loading. The purposes of this analysis are an assessment of experimental uncertainties for chosen tests and refine, where it possible, the estimated experimental values of measured parameters.
The results of some tests that were carried out at units of Tianwan NPP (China), Bushehr NPP (Iran) and Kudankulam NPP (India) are under consideration. For each test it is discussed possible origins of experimental uncertainties and the confidence of made estimation.
The estimations presented in this paper may be useful for definition of criteria for the future physical test programme of new units. Refined experimental values of some parameters may be used for the purpose of code validation.