La Crosse Boiling Water Reactor: Decommissioning and Environmental Legacy

Overview

The La Crosse Boiling Water Reactor (LACBWR) was a nuclear power plant located in the village of Genoa, Wisconsin, within Vernon County. The facility was situated approximately 17 miles south of the city of La Crosse, positioned along the banks of the Mississippi River. The plant was owned and operated by Dairyland Power Cooperative, which managed the site throughout its operational life. The reactor was commissioned in 1969, marking the beginning of its contribution to the regional energy infrastructure. It utilized a boiling water reactor (BWR) design, with uranium serving as the primary fuel source for energy generation. The installed capacity of the facility was 50 MW, reflecting its role as a modest but significant power source for the cooperative's members during the late 20th century.

The LACBWR site was integrated into a broader energy complex, located directly adjacent to the coal-fired Genoa Station #3. This proximity allowed for shared infrastructure and logistical efficiencies between the nuclear and thermal generation assets under Dairyland Power Cooperative’s management. The facility operated for several decades before undergoing decommissioning procedures. Although the reactor structure has been demolished and the plant is officially classified as decommissioned, the site remains active in terms of nuclear fuel management. Spent nuclear fuel continues to be stored on the location, requiring ongoing monitoring and maintenance by the operator.

The decommissioning of the La Crosse Boiling Water Reactor represents a significant chapter in the history of nuclear energy in Wisconsin. The transition from active operation to a spent fuel storage site highlights the long-term commitments associated with nuclear power generation. Dairyland Power Cooperative retains ownership of the site, ensuring that the legacy of the LACBWR is managed with attention to environmental and operational standards. The presence of the Mississippi River provided essential cooling resources for the BWR technology, underscoring the strategic location chosen for the plant's development. The facility's history reflects the evolving landscape of energy production in the region, balancing nuclear innovation with traditional coal-fired generation.

History and Construction

Construction of the La Crosse Boiling Water Reactor (LACBWR) commenced in 1963 and concluded in 1967, establishing a significant nuclear infrastructure project in Vernon County, Wisconsin. The facility was designed by Allis-Chalmers, a key engineering firm involved in the early development of commercial boiling water reactor technology in the United States. This design choice aligned with the broader trend of integrating BWR systems into regional power grids during the mid-20th century, offering a streamlined approach to steam generation and turbine drive compared to pressurized water reactor configurations.

Funding and Development

The development of the plant was significantly supported by funding from the Atomic Energy Commission (AEC), the primary federal agency responsible for overseeing nuclear energy expansion in the US during that era. The AEC’s financial involvement helped mitigate some of the initial capital risks associated with early commercial nuclear projects, enabling Dairyland Power Cooperative to proceed with the construction near La Crosse. This federal backing was typical for early nuclear sites, where government incentives played a crucial role in accelerating the deployment of uranium-fueled power generation.

Commissioning and Early Operation

The reactor was officially commissioned in 1969, marking the beginning of its commercial operation. Located in the village of Genoa, approximately 17 miles south of La Crosse along the Mississippi River, the plant was situated directly adjacent to the coal-fired Genoa Station #3. This proximity allowed for efficient integration into the existing regional power infrastructure managed by Dairyland Power Cooperative. The 50 MW capacity of the BWR provided a reliable baseload power source for the cooperative’s members, contributing to the energy mix of southwestern Wisconsin. The site remains owned by Dairyland Power Cooperative, which continues to manage the decommissioned facility and the storage of spent nuclear fuel.

Technical Specifications

The La Crosse Boiling Water Reactor (LACBWR) utilized a boiling water reactor (BWR) design, a technology distinct from pressurized water reactors in its direct-cycle operation. In this configuration, water circulates through the reactor core where it is heated by the fission of uranium fuel. The water boils directly within the core, producing steam that drives the turbine generator without passing through a secondary heat exchanger. This forced-circulation direct-cycle design is characteristic of BWR technology, allowing for a relatively compact plant layout compared to other nuclear designs of the era.

The plant had an installed electrical capacity of 50 MW. This output was modest compared to larger nuclear units, reflecting the scale of the Dairyland Power Cooperative's needs at the time of commissioning in 1969. The reactor was situated adjacent to the coal-fired Genoa Station #3, facilitating shared infrastructure and grid connection points for the cooperative. The proximity to the coal station allowed for integrated operations, although the nuclear unit operated independently in terms of thermal cycle and fuel management.

Technical Parameters

Following decommissioning, the reactor structure was demolished. However, the site remains in use for the storage of spent nuclear fuel. The spent fuel, consisting of uranium rods that have undergone fission, is stored on-site, maintaining the location as an active nuclear energy infrastructure point despite the cessation of power generation. The site is owned by Dairyland Power Cooperative, which manages the long-term storage and monitoring of the residual nuclear materials.

Why it matters

The La Crosse Boiling Water Reactor (LACBWR) holds historical significance as a key component of the United States Atomic Energy Commission’s Power Reactor Demonstration Program. This federal initiative was designed to validate the technical and economic viability of nuclear energy for peacetime electricity generation during the mid-20th century. As one of the early commercial-scale boiling water reactors, LACBWR served as a critical proof-of-concept for the technology that would later dominate the US nuclear fleet. Its operation demonstrated that BWR technology could provide reliable baseload power, reducing reliance on fossil fuels and establishing nuclear energy as a mainstream source of electricity for American utilities.

For the Dairyland Power Cooperative, the commissioning of LACBWR in 1969 marked a strategic diversification of its energy portfolio. Prior to this, Dairyland’s generation mix was heavily dependent on coal-fired plants, such as the adjacent Genoa Station #3. The integration of a 50 MW nuclear unit allowed the cooperative to introduce a new fuel source—uranium—into its generation mix. This diversification helped mitigate fuel price volatility and provided a steady, low-variable-cost power source for its member utilities in Wisconsin, Minnesota, and Iowa. The proximity of the nuclear reactor to the existing coal infrastructure at Genoa also allowed for efficient use of land and transmission lines, optimizing the cooperative’s operational logistics.

The decommissioning and subsequent demolition of the reactor highlight the lifecycle management challenges associated with early nuclear technology. While the physical structure has been removed, the site continues to serve as a storage location for spent nuclear fuel. This ongoing stewardship underscores the long-term commitment required for nuclear sites, even after active generation ceases. The LACBWR’s legacy remains embedded in the regional energy infrastructure, illustrating the transition from experimental demonstration plants to established energy assets. Its role in the Power Reactor Demonstration Program helped pave the way for larger, more complex nuclear projects across the United States, influencing the trajectory of the national energy grid.

Decommissioning Process

The La Crosse Boiling Water Reactor (LACBWR) underwent a multi-decade decommissioning process following its operational shutdown. The facility, located in Genoa, Wisconsin, was operated by Dairyland Power Cooperative. The decommissioning strategy evolved from an initial SAFSTOR (Safe Storage) approach to a more aggressive removal phase, culminating in the transfer of site responsibilities to EnergySolutions. Spent nuclear fuel remains stored at the location despite the physical demolition of the reactor structure.

Decommissioning Timeline

The reactor ceased operations in 1987. Following the shutdown, the facility was placed into SAFSTOR status in 1991. This strategy involved allowing short-lived radioactivity to decay while maintaining the reactor structure and systems in a safe condition. The reactor pressure vessel was removed in 2007, marking a significant step in the physical deconstruction of the plant. The site was subsequently transferred to EnergySolutions, which completed the demolition process in 2019. Although the reactor building and associated structures have been demolished, spent nuclear fuel continues to be stored on-site. The location remains adjacent to the coal-fired Genoa Station #3, maintaining its position along the Mississippi River in Vernon County.

Spent Nuclear Fuel Storage

The La Crosse Boiling Water Reactor site continues to serve as a critical node in the regional nuclear fuel cycle, primarily due to the ongoing storage of spent nuclear fuel. Although the reactor structure itself has been demolished and the facility officially decommissioned, the physical presence of the fuel requires continuous monitoring and infrastructure maintenance. The site is located in the village of Genoa, Vernon County, Wisconsin, adjacent to the coal-fired Genoa Station #3, a geographical configuration that influences the logistical approach to fuel management. The operator, Dairyland Power Cooperative, retains ownership of the site and is responsible for the secure containment of the uranium-based fuel assemblies that were utilized during the plant’s operational life, which began in 1969.

Independent Spent Fuel Storage Installation

To manage the long-term storage of the spent fuel, Dairyland Power Cooperative implemented an Independent Spent Fuel Storage Installation (ISFSI). This infrastructure allows for the dry cask storage of fuel assemblies, a method that provides passive cooling and robust physical protection for the fuel rods. The installation of these dry casks was completed in 2012, marking a significant phase in the decommissioning process and transitioning the site from active reactor operations to a dedicated storage facility. The dry cask system is designed to hold the fuel for extended periods, potentially decades, while awaiting final disposal. This approach is common in the United States for decommissioned boiling water reactors, where the volume of spent fuel can be substantial relative to the plant's initial capacity of 50 MW.

The maintenance of the ISFSI involves regular inspections, radiation monitoring, and structural assessments to ensure the integrity of the casks and the surrounding pad. Dairyland Power Cooperative manages these operations, leveraging its experience from the plant's original commissioning in 1969. The proximity to the Mississippi River, approximately 17 miles south of La Crosse, provides a geographical context for the site, although the river itself plays a less direct role in the dry cask storage phase compared to the active cooling requirements of the boiling water reactor. The site remains an active industrial location, with the spent fuel serving as the primary asset requiring long-term stewardship.

Pending National Disposal Facility

The ultimate destination for the spent nuclear fuel stored at the La Crosse site is the pending national disposal facility, a long-sought solution for the United States' nuclear waste management challenges. The current storage arrangement is considered interim, designed to bridge the gap between the reactor's decommissioning and the establishment of a permanent geologic repository. The uncertainty surrounding the timeline for the national disposal facility has necessitated the robust design of the ISFSI, ensuring that the fuel can be safely stored for extended periods without significant degradation or increased risk. Dairyland Power Cooperative's role includes maintaining the site in a state of readiness for eventual transportation, which will involve coordinating with federal regulators and transportation logistics providers.

The existence of the spent fuel storage at Genoa highlights the broader challenges facing the U.S. nuclear industry, particularly for smaller, decommissioned plants like the 50 MW La Crosse Boiling Water Reactor. The fuel remains a liability and an asset, requiring continuous financial and operational commitment from the operator. As the national disposal facility progresses through its various stages of development and political scrutiny, the La Crosse site serves as a case study in the long-tail responsibilities of nuclear power generation. The dry casks installed in 2012 represent a stable, engineered solution that has successfully contained the spent fuel for over a decade, demonstrating the effectiveness of modern storage technologies in the absence of a permanent repository. The site's status as a decommissioned plant with active storage underscores the multi-generational nature of nuclear infrastructure management.

See also

• Cap-and-Invest (Washington state)
• Flexible wave energy converter: US Patent 11401910
• 2014 Dan River coal ash spill
• Climate Stewardship Acts: US Senate Cap and Trade Proposals
• Panda Energy International: Corporate History and Market Exit