CREATE TABLE nuclear_power_plants (id CLOB, name CLOB, latitude CLOB, longitude CLOB, country CLOB, status CLOB, reactortype CLOB, reactormodel CLOB, constructionstartat CLOB, operationalfrom CLOB, operationalto CLOB, capacity CLOB, lastupdatedat CLOB, source CLOB)

What is the maximum capacity of existing pressurized water reactor?
SELECT MAX(capacity) FROM nuclear_power_plants WHERE reactortype = "PWR" AND status = "Operational"
SELECT MAX("capacity") FROM "nuclear_power_plants" WHERE "Operational" = "status" AND "PWR" = "reactortype"