1953- First U.S. reactor ordered and completed at Shippingport, PA.

1954- 0 reactors ordered.

1956- 1 reactor ordered and completed.

1957- 2 reactors ordered and completed.

1958- 3 reactors ordered and completed.

1959- 3 reactors ordered and completed

1960- 1 reactor ordered and completed.

1961- 0 reactor orders.

1962- 2 reactors ordered and completed.

1963- 3 reactors ordered and completed.

1964- 0 units ordered.

1965- 7 units ordered and completed.

1966- 20 units ordered and completed.

1967- 31 units ordered. 29 completed and 2 cancelled.

1968- 16 units ordered. 12 completed and 4 cancelled.

1969- 7 units ordered. 4 completed and 3 cancelled.

1970- 14 units ordered. 12 completed and 2 cancelled.

1971- 21 units ordered. 9 completed and 12 cancelled.

1972- 38 units ordered. 13 completed and 25 cancelled.

1973- Last year in which orders were successfully completed. 41 reactors were ordered. 31 units were cancelled.

The following 10 reactors were ordered 1973 and subsequently completed construction to receive an operational license:

Clinton Unit 1 ordered in January

Millstone 3 ordered in February

Callaway Unit 1 ordered in July

Wolf Creek Unit 1 ordered in July

South Texas 1 and 2 ordered in July

Palo Verde Units 1, 2 and 3 were the last reactors ordered in October of 1973 that completed construction and operated.

1974- 26 reactors were ordered and all were subsequently cancelled.

1975- 4 reactors ordered in 1975 were cancelled.

1976- 3 reactors ordered were cancelled.

1977- 4 were ordered cancelled.

1978- 2 reactors ordered and cancelled.

1979- No orders were placed

Total of 103 reactors remain operational in the U.S. to date. An additional unit, Browns Ferry Unit 1, retains an operational license but has not operated since 1985. NEI lists 123 units ordered by U.S. were subsequently cancelled.