CREATE TABLE table_name_13 (close_of_reactor VARCHAR2, rated_power VARCHAR2, finish_construction VARCHAR2)

When did the reactor that has a rated power of 945 MW and ended construction on May 10, 1978 close?
SELECT close_of_reactor FROM table_name_13 WHERE rated_power = "945 mw" AND finish_construction = "may 10, 1978"
SELECT "close_of_reactor" FROM "table_name_13" WHERE "945 mw" = "rated_power" AND "finish_construction" = "may 10, 1978"