Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_64 ( reactortype VARCHAR, gross_capacity VARCHAR, electricity_grid VARCHAR )

### Question ###
Which Reactortype has a gross capacity of 417 mw and an Electricity Grid of 27.12.1971?

### Accurate SQL ###

SELECT reactortype FROM table_name_64 WHERE gross_capacity = "417 mw" AND electricity_grid = "27.12.1971"