NAC News

April 4, 2023

OAK RIDGE, TN, April 4, 2023 – The board of directors of NAC Philotechnics, Ltd., ( has appointed veteran waste management executive Ken Grumski as its new president. A wholly-owned subsidiary of NAC International Inc. (NAC), NAC Philotechnics is a health physics, radiological services and waste management company headquartered in Oak Ridge, TN, with a satellite facility in San Diego, CA. 

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January 19, 2023
Peachtree Corners, GA, January 19, 2023 – NAC International Inc. (NAC) has received U.S. Nuclear Regulatory Commission (NRC) approval for a new Metal Storage Overpack (MSO) option for its MAGNASTOR® dry cask storage system technology, further expanding its ability to securely and efficiently store spent nuclear fuel. The latest innovation leverages MAGNASTOR’s capabilities to accommodate dry spent fuel canisters in a new MSO that provides excellent shielding and structural protection. The MSO enables users to implement a more compact storage facility and reduce the associated facility costs.

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January 10, 2023

PEACHTREE CORNERS, GA, January 10, 2023 – NAC International Inc. (NAC) announced today that it has completed the acquisition of Philotechnics, Ltd. ( a health physics, radiological services, and waste management company headquartered in Oak Ridge, TN with a satellite facility in San Diego, CA. 

Founded in 1981, Philotechnics established itself as an integrated radioactive waste broker and processor, providing full-service low-level radioactive waste (LLW) and mixed-waste management services to more than 1,000 independent clients over its 40-plus year history. Philotechnics is a recognized leader in small facility (e.g., labs, universities, industrial sites) Decontamination and Decommissioning (D&D) and license termination projects. The company, now under NAC International ownership, has been renamed NAC Philotechnics, Ltd

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September 20, 2022
Sigma Science, Inc., and NAC International, Inc., have formed a joint-venture – Sigma-NAC Nuclear Solutions, LLC (SNNS) – under a Small Business Administration (SBA)-approved mentor-protégé agreement. This new SBA-qualifying small business joint-venture combines the strength of two trusted providers in the nuclear industry.

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June 22, 2022
January 25, 2022

Peachtree Corners, GA – January 25, 2022 – NAC International Inc. (NAC) announced the expansion of its consulting capabilities with a new global network of experts specializing in every facet of the nuclear fuel cycle. NAC launched today an interactive webpage which allows users to choose just the right consultant, tailored to their nuclear fuel cycle needs. 

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December 21, 2021

Peachtree Corners, GA, December 21, 2021 – NAC International Inc. (NAC) announced today it has received U.S. Nuclear Regulatory Commission (NRC) certification for the OPTIMUS®-L version of its versatile OPTIMUS® (OPTImal Modular Universal Shipping) transport packaging system. The OPTIMUS-L is now approved under NRC 10 CFR Part 71 with Certificate of Compliance (CoC) USA/9390/B(U)F-96, effective December 16, 2021. This new certificate follows recent licensing approvals under Canadian Nuclear Safety Commission (CNSC) certifications for the OPTIMUS system in Canada, where NAC has delivered systems in support of an important nuclear decommissioning project. 

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September 20, 2021

A contract worker for NAC International, Michael “Shawn” Miller, died while working at the Three Mile Island site on September 10. The incident occurred while unloading a truck and was outside the radiological controlled area, according to the Nuclear Regulatory Commission. The following is a statement from Kent Cole, president and CEO of NAC:

“NAC extends its most sincere condolences to Shawn's family, friends, and colleagues. This is a terrible tragedy and appropriate reviews are going on. It would be premature to make any further comment pending the results of those reviews.” 

September 17, 2021

NAC International congratulates the Interim Storage Partners (ISP) team on successfully obtaining an NRC license for a consolidated interim storage facility for used nuclear fuel. As a project participant, NAC worked to support the licensing of the ISP project and to ensure NAC cask technology is covered under the license for ISP deployment.  For more information in this announcement, please go to the link below:

August 24, 2021
OPTIMUS-H Transport Packaging

NAC International Inc. (NAC) announced that a second model of its versatile OPTIMUS® transport packaging system has received certification from the Canadian Nuclear Safety Commission (CNSC). Known as the OPTIMUS-H version for its capability to accommodate high activity nuclear waste, the system is now approved under CNSC Certificate Number CDN/2098/B(U)F-96 (Rev. 0) effective August 18, 2021.

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