Vermont Yankee Nuclear Power Plant

Vermont Yankee Nuclear Power Plant
Name	Vermont Yankee Nuclear Power Plant
Country	United States
Location	Vernon, Windham County, Vermont
Operator	Entergy Corporation
Owner	Entergy Corporation (former), Vermont Yankee Nuclear Power Corporation (historical)
Status	Decommissioned
Construction started	1966
Commissioned	1972
Decommissioned	2014
Reactor type	Boiling Water Reactor (BWR/4)
Reactor supplier	General Electric
Thermal capacity	1910 MWt
Electrical capacity	620 MWe (net ~515 MWe)
Cooling	Connecticut River
Units	1 × 620 MWe

Vermont Yankee Nuclear Power Plant

Vermont Yankee Nuclear Power Plant was a commercial nuclear generating facility located in Vernon, Windham County, Vermont, United States. Built and originally operated during the 1960s and 1970s energy expansion, the plant became a focal point of regulatory, legal, environmental, and political controversy involving a range of actors including Entergy Corporation, the Nuclear Regulatory Commission, state officials, and advocacy organizations. The site ceased power operations in 2014 and entered a multi-decade decommissioning and site restoration process.

History

Construction began amid the postwar expansion of American Electric Power-era utilities and regional demand, with financial and engineering inputs from General Electric (GE), Stone & Webster, and contractors linked to the wider New England utility network. The plant was commissioned in 1972 during the administration of Richard Nixon and under federal licensing from the Atomic Energy Commission prior to regulatory transition to the Nuclear Regulatory Commission (NRC). Ownership and operational control shifted through corporate transactions that involved Entergy Corporation acquiring the plant in the 2000s, intersecting with state-level politics involving Howard Dean and later Peter Shumlin. High-profile legal disputes reached state supreme courts and prompted intervention by the Vermont Legislature and the Vermont Public Service Board in debates reflecting national controversies sparked after incidents at Three Mile Island and later Fukushima Daiichi nuclear disaster. Community groups including Goshen Peace Center-affiliated activists, local municipal boards, and national organizations such as the Sierra Club and Greenpeace were deeply engaged in public campaigns around relicensing, taxation, and safety.

Design and Technical Specifications

The plant housed a single General Electric BWR/4 boiling water reactor designed to produce approximately 620 MWe gross, with net electrical output reduced by on-site loads consistent with plants like Dresden Nuclear Power Plant and LaSalle County Nuclear Generating Station. Reactor systems included GE-supplied turbines, a Mark I containment derivative similar in configuration to some Peach Bottom Atomic Power Station units, and primary systems utilizing recirculation pumps, steam separators, and emergency core cooling systems analogous to other BWR designs. The thermal output was roughly 1910 MWt, with condenser cooling drawn from the Connecticut River via once-through cooling systems; this configuration paralleled cooling approaches used at Indian Point Energy Center and elsewhere in the Northeast United States fleet. Instrumentation and control originally used analog instrumentation panels later upgraded with digital controls following industrywide retrofits observed at plants such as Oyster Creek Nuclear Generating Station.

Operations and Performance

Operations spanned four decades of load-following and baseload service within the regional New England Independent System Operator footprint. Capacity factors varied, reflecting outages for refueling, maintenance, and regulatory-mandated inspections similar to practices at Pilgrim Nuclear Power Station and Seabrook Station. The plant participated in wholesale markets influenced by commodity price shifts, competition from natural gas combined-cycle plants, and policy changes including state-level renewable incentives championed by legislators and organizations such as ISO New England and the Vermont Department of Public Service. Workforce and labor relations involved trades represented by unions analogous to those in the International Brotherhood of Electrical Workers and craft unions present at other long-running plants.

Safety Incidents and Regulatory Oversight

Safety history included multiple reportable events and NRC inspections comparable to industry patterns post-Three Mile Island accident. Notable incidents prompted heightened NRC scrutiny, Special Inspection Teams, and corrective action plans similar to follow-up activities at plants like Millstone Nuclear Power Station. Regulatory debates encompassed license renewal filings with the Nuclear Regulatory Commission, state-level litigation invoking the Vermont Public Service Board, and disputes over Vermont statutes aimed at nuclear plant operation and taxation. Activist responses and whistleblower complaints involved organizations and figures such as State of Vermont officials, Vermont Attorney General filings, and national watchdogs like the Union of Concerned Scientists. Emergency preparedness coordination included exercises with Federal Emergency Management Agency guidelines and local county emergency management agencies.

Decommissioning and Site Restoration

After Entergy announced closure in 2013, the facility permanently shut down in December 2014 and entered decommissioning under NRC oversight, following pathways used by former operators at Zion Nuclear Power Station and Connecticut Yankee. Decommissioning strategies considered SAFSTOR and DECON approaches under NRC regulations, involving fuel removal to the Spent Fuel Pool and subsequent transfer to on-site dry cask storage similar to practices at Vermont Nuclear Power Station-analog sites. Remediation plans required coordination with the Environmental Protection Agency, state environmental agencies, and contractors experienced in radiological decontamination such as firms that worked on other decommissioning projects like Fort Calhoun Nuclear Power Plant. Long-term site restoration tasks included demolition of structures, soil and groundwater monitoring, and possible redevelopment deliberations with local municipalities and economic development agencies.

Environmental and Economic Impact

Environmental assessments documented water temperature and aquatic impacts in the Connecticut River consistent with once-through cooling effects studied in environmental reviews for facilities like Indian Point and Oyster Creek. Radiological monitoring addressed legacy contaminants and low-level waste management in coordination with NRC and EPA standards. Economically, closure affected regional employment, municipal tax bases, and supply-chain businesses, leading to mitigation efforts involving state economic development programs and federal transition assistance similar to initiatives after other plant retirements such as at Kewaunee Nuclear Generating Station and San Onofre Nuclear Generating Station. Public debate linked energy policy, Vermont Public Service priorities, and broader trends in the American electric sector including shifts toward natural gas and renewable energy resources.

Category:Defunct nuclear power stations in the United States Category:Buildings and structures in Windham County, Vermont