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 […]
Browns Ferry needed durable and effective floor shielding for the trough of their 360 cavity inspection platform. Like with most floor shielding applications, T-Flex® Bismuth was chosen because of its great attenuation properties relative to its cost. On top of the Bismuth shielding was a yellow slip-resistant tread surface to ensure workers would be able […]
Some shielding applications require a precise fit in order to shield effectively. The meter of this instrument was a streaming source for the workers operating it. To fit the area, NPO used drawings of the steel housing and designed T-Flex Tungsten shielding that fit snuggly around the meter. 3D printed molds were used to create […]
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 […]
South Texas Project required new shielding for a section of the pressurizer spray line. Though the area looks small, the total shield weight was around 850 lb (386 kg). This was due to the 6.5″ (165 mm) diameter of the pipe and the 1.5″ (38 mm) thick shielding pieces. But despite the size and […]
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 […]
NPO was brought on to provide shielding for Mechanical Penetrations Room No. 1 at Davis-Besse. This room featured a variety of pipe runs with many valves, bends, and reductions throughout as well as many hot spots. Using a combination of drawing information and practical measurements taken on site, NPO provided a shielding package using T-Flex […]
Byron had an issue with an ARGOS Zeus unit in the main exit area of the RCA. Background gamma radiation from a line in the overhead was shining down and causing false alarms on the gamma detectors to the point of making the unit inoperable. Due to the position of the Argos unit it was […]
NPO offers a number of engineering services to validate the integrity and performance of our shielding. We are the industry experts when it comes to aiding nuclear power plants design new and unique shielding and pride ourselves on our technical expertise. We want to act as part of your team to not only ensure the […]
NPO worked closely with AVANTech in designing a set of three shielded casks that reduced dose from 26,000-30,000 mRem/hr (260,000-300,000 μSv/hr) to less than 60 mRem/hr (600 μSv/hr) on contact. Two casks were utilized with one as a spare. Each shielded cask housed one of their Solids Collection Filter canisters for torus water/sludge filtration at […]
