INFLUENCE OF DELAYED NEUTRON PARAMETERS CALCULATION ACCURACY ON RESULTS OF MODELED VVER SCRAM EXPERIMENTS
17th Symposium of AER on VVER Reactor Physics and Reactor Safety (2007, Yalta, Crimea (Ukraine, back then))
CORE OPERATION, EXPERIMENTS AND CODE VALIDATION
Using modeled VVER scram rod drop experiments, performed at the Rostov NPP, as an example, the influence of delayed neutron parameters on the modeling results was investigated. The delayed neutron parameter values were taken from both domestic and foreign nuclear databases.
Numerical modeling was carried out on the basis of SAPFIR_95&RC_VVER program package. Parameters of delayed neutrons were acquired from ENDF/B-VI and BN?B-78 validated data files.
It was demonstrated that using delay fraction data from different databases in reactivity meters led to significantly different reactivity results.