Heavy Water Components Test Reactor (HWCTR) was an experimental nuclear reactor at the Savannah River Site in Aiken County, South Carolina.

The building was designed to contain an internal pressure of 24 psig (165 kPa).

It was built to test the concept of a heavy water moderated and cooled reactor for civilian power.

[2][3] During deactivation activities at the HWCTR in 2010, an unanticipated high dose was experienced during the removal of wire flux monitor cabling.

A higher than expected dose rate was detected when the lowest of the three ion chambers exited the reactor vessel below the lower axial shield.