A project of the OLVE-HERO space detector is proposed for CR measurement in the range $10^{12}$-$10^{16}$ eV and will include a large ionization-neutron 3D calorimeter with a high granularity and geometric factor of ~16 $m^{2}٠sr$. The present main OLVE-HERO detector is expected to be an image calorimeter of a boron loading of plastic scintillator with a tungsten absorber. Such a calorimeter allows one to measure an additional neutron signal which will improve the energy resolution of the detector and mainly the rejection power between electromagnetic and nuclear CR components will be increased by factor 30-50. The boron loading OLVE-HERO detector prototype was designed and tested at SPS CERN during Pb ion run in 2018. Results of the OLVE-HERO toy Monte-Carlo simulation are presented.