Criticality Safety Support Group

About the Criticality Safety Support Group

The Criticality Safety Support Group (CSSG) was formed in response to Defense Nuclear Facilities Safety Board (DNFSB) Recommendation 97-2, Criticality Safety. The CSSG functions as the technical support group to the Nuclear Criticality Safety Program (NCSP) Manager, providing operational and technical expertise pertinent to the criticality safety needs of DOE missions. This expertise is relevant to integral experiments, nuclear data, methods, training, and organizational structures supporting the development and execution of the NCSP. Additionally, the scope of CSSG activities also includes reviewing:

  • Activities or conditions that have the potential for serious degradation of nuclear criticality safety at DOE facilities
  • New nuclear facility designs where criticality is a credible hazard
  • New or revised DOE directives, standards and guides related to criticality safety
  • Contractor nuclear criticality safety programs at DOE facilities in support of DOE line management

Find out moreThe CSSG conducts its work in accordance with a Charter, Work Instructions, and Membership Policy as approved by the NCSP Manager.


CSSG Members

The CSSG consists of 11 current members including the Chair and Deputy Chair. The members are selected from DOE and its Contractors to provide a collective knowledge spanning the broad spectrum of nuclear criticality safety technology and safety areas. The 11 current members are the only voting members of the CSSG. Emeritus status is comprised of formerly Current members. Ex-officio members are appointed to provide expertise in a specific area of criticality safety. All members are appointed by, and serve with the approval of the NCSP Manager.


Photo David Erickson David Erickson | Bio
Photo David Hayes David Hayes | Bio
Deputy Chair
Photo David Heinrichs David Heinrichs | Bio
Photo Jerry Hicks Jerry E. Hicks | Bio
DOE, retired
Photo Kevin Kimball Kevin Kimball | Bio
Y12, retired
Photo Thomas McLaughlin Thomas McLaughlin | Bio
LANL, retired
Photo James Morman James Morman | Bio
Photo Michaele Brady Raap Michaele C. Brady Raap | Bio
PNNL, retired
Photo Kevin Reynolds Kevin Reynolds | Bio
Y-12 National Security Complex
Photo E. Fitz Trumble E. Fitz Trumble | Bio
Photo Robert Wilson Robert Wilson | Bio


Ex-officio Members

Photo Angela Chambers Angela Chambers | Bio
Photo Doug Bowen Doug Bowen | Bio
Photo Michael Zerkle Michael Zerkle | Bio


Emeritus Members

Photo Richard Anderson Richard Anderson | Bio
Photo Calvin Hopper Calvin Hopper | Bio
ORNL, retired | Career Award
Photo Jerry McKamy Jerry McKamy | Bio
NNSA, retired
Photo Thomas Reilly Thomas Reilly
WSMS, retired | Career Award
Photo R. Michael Westfall R. Michael Westfall | Bio
ORNL, retired | Career Award


Past Members

Photo Adolf Garcia Adolf Garcia
Rest in Peace | Career Award
Photo Davis Reed Davis Reed | Bio
Retired, inactive
Photo Hans Toffer Hans Toffer | Bio
Fluor Gov't Group, retired
Rest in Peace | Career Award