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 10 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 10 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.


 David Hayes David Hayes | Bio
dkhayes [at]
 Michaele Brady Raap Michaele C. Brady | Bio
Deputy Chair
PNNL, ret.
MikeyBrady [at]
Photo David Erickson David Erickson | Bio
David.Erickson [at]
 David Heinrichs David Heinrichs | Bio
heinrichs1 [at]
 Jerry Hicks Jerry E. Hicks | Bio
DOE, ret.
jerryhicks [at]
 Thomas McLaughlin Thomas McLaughlin | Bio
LANL, ret.
tpm [at]
 James Morman James Morman | Bio
jamorman [at]
 Kevin Reynolds Kevin Reynolds | Bio
Y-12 National Security Complex
Kevin.Reynolds [at]
 E. Fitz Trumble E. Fitz Trumble | Bio
fitz.trumble [at]
 Robert Wilson Robert Wilson | Bio
robert.wilson [at]


Ex-officio Members

Photo Angela Chambers Angela Chambers | Bio
Angela.Chambers [at]
Photo Doug Bowen Doug Bowen | Bio
bowendg [at]
Photo Michael Zerkle Michael Zerkle | Bio
Michael.Zerkle [at]


Emeritus Members

 Richard Anderson Richard Anderson | Bio
REAnderson [at]
 Calvin Hopper Calvin Hopper | Bio
ORNL, retired | Career Award
hoppercm [at]
 Kevin Kimball Kevin Kimball | Bio
Y12, retired
kimballkd [at]
 Jerry McKamy Jerry McKamy | Bio
NNSA, retired
mckamyjn [at]
silhouette Thomas Reilly | Career Award
WSMS, Ret.
mimtar [at]
 R. Michael Westfall R. Michael Westfall | Bio
ORNL, retired | Career Award
WestfallRM [at]


Past Members

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