Blog

Tag: Lead

Oconee Heat Exchanger Skid Shielding

April 16, 2024

IMG_1385IMG_1391HX Skid Shielding Survey Results

Heat Exchanger Shielding – Permanent Installation

March 29, 2021

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 […]

Permanent Pipe Shielding for Davis-Besse

November 17, 2020

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 […]

NPO Engineering Services

July 9, 2020

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 […]

Shielded Filter Casks

April 29, 2020

NPO worked closely with AVANTech in designing a set of three shielded casks that reduced dose from 26,000-30,000 mRem/hr to less than 60 mRem/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 Fermi. To achieve their […]

Reactor Head Flange Shielding

May 3, 2019

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

May 31, 2018

In the scope of one job, LaSalle Generating Station saved 12 Rem 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 locked high […]

Lead Panels and Water Shields

August 11, 2017

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

April 11, 2017

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 […]

MCNP Case Study – Dry Cask Shielding

March 28, 2017

One year ago we introduced our new ability to simulate complex radiation profiles and thereby design the most effective shielding possible (‘NPO uses MCNP to simulate Dry Cask’, March 2016).  Since then we’ve designed and built more than a few shielding systems using this new ability.  Now the day has finally come where we can […]