Millstone - Unit 1
1.0 Site Identification
|Type of Site:
||Power Reactor Facility
2.0 Site Status Summary
Millstone Unit 1 was a single-cycle, boiling water reactor with a Mark I containment which was designed, furnished and constructed by General Electric Company as prime contractor for the licensee. The General Electric Company engaged Ebasco Services Incorporated as architect-engineer. Millstone Unit 1 had a reactor thermal output of 2011 megawatts and a net electrical output of 652.1 megawatts. The Millstone site is located in the town of Waterford, New London County, Connecticut, on the north shore of Long Island Sound. The owner's current plan is to leave the plant in SAFSTOR until 2048. The owner submitted its required PSDAR on June 14, 1999, and has chosen a combination of the DECON and SAFSTOR options. Owner responsibility for the Millstone site was transferred from Northeast Utilities to Dominion Nuclear Connecticut on March 31, 2001. Safety related structures, systems, and components (SSCs) and SSCs important to safety remaining at Millstone Unit 1 are associated with the spent fuel pool island where the Millstone Unit 1 spent fuel is stored. Other than non-essential systems supporting the balance of plant facilities, the remaining plant equipment has been de-energized, disabled and abandoned in place or removed from the unit and can no longer be used for power generation. Irradiated reactor vessel components not able to eventually being disposed of with the reactor vessel have been removed. The reactor cavity and vessel has been drained and abandoned with a radiation shield installed to limit dose to workers. After a formal assessment of spent fuel storage options in 2007, the licensee concluded that they would keep the Millstone Unit 1 fuel in the Spent Fuel Pool, in a SAFSTOR status, until 2048 rather than move the fuel to an ISFSI.
Construction of Millstone Unit 1 was authorized by a provisional construction permit CPPR-20, on May 19,1966, in AEC Docket 50-245. Millstone Unit 1 was completed and ready for fuel loading during October 1970. The plant went into commercial operation on December 28, 1970. Unit 1 was shut down on November 4, 1995, and transfer of the spent fuel to the pool was completed on November 19, 1995. On July 21, 1998, pursuant to 10 CFR 50.82(a)(1)(i) and 10 CFR 50.82(a)(1)(ii), the licensee certified to the NRC that, as of July 17, 1998, Millstone Unit No. 1 had permanently ceased operations and that fuel had been permanently removed from the reactor vessel. The issuance of these certifications changed the licensing basis of Millstone Unit 1 in that the NRC issued 10 CFR Part 50 license no longer authorizes operation of the reactor or emplacement or retention of fuel in the reactor vessel.
3.0 Major Technical or Regulatory Issues
4.0 Estimated Date For Closure
Page Last Reviewed/Updated Wednesday, April 13, 2022