Investigations of Nuclear Interactions in Energy Interval (10$sup 12$- 10$sup 14$) eV at the Altitude of 50 m Above Sea Level by Means of the Apparatus of Large Area; ISSLEDOVANIYA YADERNYKH VZAIMODESTVIIV OBLASTI ENERGII (10$sup 12$- 10$sup 14$) EV NA VYSOTE 50 m NAD UROVENEM MORYA PRI POMOSHCHI USTANOVKI BOL'SHOI PLOSHCHADI