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Oconee Heat Exchanger Skid Shielding

BEFORE AFTER Oconee Nuclear Station contacted NPO to develop a permanent shielding solution for the Supplemental Spent Fuel Cooling Heat Exchanger. The heat exchanger is located inside the truck bay with one side exposed to the main truck bay door at the Radiologically Controlled Area (RCA) boundary. The ALARA planners at Oconee wanted a permanent […]

Vogtle Reactor Head Shielding

In 2021, Vogtle reached out to NPO to help develop a new shielding package for around the reactor head. Their current system consisted of two rings: one under the head, and one around the outside of the head. Each of these shield rings used 1’ x 6’ (305 mm x 1829 mm) 60 lb (27.2 […]

Oconee Reactor Head T-Flex Shielding

Reactor head shielding is an essential part of every refuel outage. Oconee Nuclear Station sought to upgrade the shielding used at the bottom of the reactor head, opting to use lead-free T-Flex Bismuth blankets. Specifically designed for the application, these blankets T-Flex blankets were covered in blue PVC with Oconee specified printing that clearly indicated […]

Heat Exchanger Shielding – Permanent Installation

As part of a long-term dose reduction plan, Ameren Callaway sought to install permanent shielding around one of their regen heat exchangers. The intention was to replace the dozens of lead wool blankets used as temporary shielding, and more importantly, eliminate the time and dose costs associated with installing and uninstalling the temporary shielding package. Working […]

T-Flex Blankets

How many lead wool blankets does your site deploy every outage? Despite best efforts, do your lead blankets look sloppy while draped over pipes and hot spots or seem mashed and bent around corners and tight spaces? How long have they been there?  How are they handling the use and abuse? Lead wool blankets, while […]

Reactor Head Flange Shielding

TVA Sequoyah needed a way to shield the surrounding area of their reactor head while inspection work was being done. To avoid setting up scaffolding or stand alone lead blanket racks that would take up valuable floor space, NPO designed lead blanket racks that would make use of the stud holes of the reactor head […]

RadVision3D – LaSalle Case Study

In the scope of one job, LaSalle Generating Station saved 12 Rem (120 mSv) through the use of 3D gamma radiation source mapping and intervention analysis, RadVision3D. The Reactor Water Cleanup valve is an Anchor Darling valve that needed to be breached and have the internals replaced during a refuel outage. It is located in a […]

Lead Panels and Water Shields

Sometimes the right shield for the job involves placing a shield as close to the source as possible as with pipe and valves shields, but other times the best solution is to put as much shielding as possible into a wall and create general area shielding for the workers. Lead panel shield walls and water shields […]

Core Barrel Shielding

In 2013 NPO designed and built a custom Core Barrel Shield for Palisades Nuclear Plant in Covert, MI.  The shielding was implemented in Palisades’ 23rd refueling outage and was a great success.  The story of the project’s success spread in May 2015 when the Palisades plant was recognized during the Nuclear Energy Institute’s best industry practice […]

Steam Dryer Flood Up Water Shielding

Tungsten T-Flex® was selected as the best material to shield divers during a Steam Dryer repair.   Approval for use in flood up water required chemical testing for leachables and heavy metals.  The end result was an 8 ft x 5 ft (2.44 m x 1.52 m) shield wall constructed by attaching T-Flex panels to a […]
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