Haddam Neck (USA)

Map of Haddam Neck

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PWR 560 MW constructed by Westinghouse ,

HNP is located on the east bank of the Connecticut River, approximately 21 miles south-southeast of Hartford, is owned by Connecticut Yankee Atomic Power Company (CYAPCO).

HNP, began commercial operation in January 1968. The plant incorporated a 4-loop closed-cycle pressurized water type nuclear steam supply system (NSSS); HNP was designed to produce 1,825 MW of thermal power and 590 MW of gross electrical power.

In 1996, HNP permanently shut down after approximately 28 years of operation. On December 5, 1996, CYAPCO announced the permanent removal of all fuel assemblies from the Reactor Pressure Vessel and their placement in the Spent Fuel Pool.. CYAPCO began to decommission the HNP.

In April of 1999, CYAPCO contracted Bechtel Power Corporation, to perform the decommissioning activities at HNP. CYAPCO continues to perform Spent Fuel Pool Island Operations and has begun decontamination and dismantlement activities at the HNP:

To the extent practical, impacted facility materials and surfaces will be decontaminated to allow beneficial reuse. Materials that cannot be decontaminated will be sent to an offsite radioactive waste processor to recycle or to a low-level waste disposal site. Completion of decommissioning the HNP site depends on the availability of low-level waste disposal sites. Currently, HNP has access to low-level waste disposal facilities in Barnwell, South Carolina, and in South Clive, Utah.

One of the significant activities that CYAPCO has performed is the creation of the Spent Fuel Pool Island. This involved separating the systems and components required to support storage of spent fuel in the Spent Fuel Pool from systems that no longer support current and planned decommissioning activities.
The decontamination activities include major component removal (e.g., steam generators and reactor pressure vessel), contaminated system removal, clean systems removal, decontamination of site buildings and cleanup of the site land areas.
Decontamination of plant structures can occur at the same time as equipment removal. Decontamination techniques may range from water washing to removal of a layer of building surface material. Contaminated equipment and structural material may be packaged and either shipped to a processing facility, or shipped directly to a low level radioactive waste disposal facility.

Decontamination and dismantlement activities are currently expected to continue until spring of 2003.
The spent fuel may continue to be stored in the existing Spent Fuel Pool or may be transferred to an independent spent fuel storage installation). Transfer of spent fuel from the Spent Fuel Building to dry storage casks at the onsite is planned to begin in 2003 and to be completed in 2004.

Actual and Projected Decommissioning Expenditures

Cost Categories Total (Million $'s)

1997 Dismantlement and Decontamination 6.7
1998 Dismantlement and Decontamination 74.0
1999 Dismantlement and Decontamination 88.3
Subtotal 1997, 1998, and 1999 169.0
Remaining Decommissioning Costs (2000 )
Dismantlement and Decontamination 153.7
Radioactive Wastes Costs 78.6
Long Term Spent Fuel Storage 102.4
Site Restoration and License Termination 19.3
Subtotal 2000 through 2023 354.0
Total Decommissioning 523.0

Facilities in Haddam Neck

plantreactor typconstruction startoperation startshut down
Haddam NeckPWR196419671996

Evaluation determined that the EDGS were subject to failure from overheating due to inadequate room air flos, cond. existed since initial operation


AFW pumps were subject to failure from high room temperatures, max. room temperature under normal conditions had been underestimated. condition existed since initial operation


Rupture of heating system lines in the cable spreading area could disable safety related equipment. design error, existed since initial operation