Blog

Tag: Lead + Steel Fabrication

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 […]

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 […]

Dry Cask Shielding Package

April 28, 2020

In 2019, Davis-Besse Nuclear Power Station, purchased an array of shielding from NPO for their spent fuel storage campaign. This package included a transfer cask shield bell, canister shield ring, and annulus gap shielding. All of these items contributed to greatly reduced dose rates for both gamma and neutron radiation. Shield bells are a single-pick […]

Mobile Shielded B25 Container

November 15, 2019

This mobile shielded container has all the same internal dimensions as a standard B25 container, but with a few added features. All six sides of the container are 0.5″ thick steel, which provides dose reduction for the rad waste it is intended to store. There are two sliding doors on top and four access doors […]

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 […]

Smear Frisker Cave

October 24, 2017

This small compact solution replaces larger heavier lead brick caves to reduce background when surveying surface smears and other samples.  The standard size (shown below) has 1” of lead on the top and bottom and 3” of lead on the sides and back.  Caves are built to order and can be designed to suit your […]

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 […]

Lower Dry Cask Barrel Shield

March 9, 2016

Some NPP’s process Dry Casks in a such a way that the entire cask produces a general area dose concern. To reduce these dose rates NPO developed a shield package that sits on the floor and shields the cask to a height of 9 feet. NPO is currently under contract to provide shield package with […]