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About SQUG

SQUG is a utility owners group formed to develop, maintain, support, and broaden the use of earthquake experience data as a cost-effective method for seismic qualification of equipment.  An Introduction to SQUG covers use of the experience-based method developed by SQUG and its advantages in seismically qualifying equipment for use in nuclear power plants.  It also summarizes the advantages of membership in the organization.


Listed below in the text box is a brief summary of the history of the SQUG owners group with a link to a more comprehensive description of the history of the organization.  A brief description of how SQUG is organized and managed is also provided in the text box at the bottom of this page.  A description of SQUG background and use in regulatory activities is provided at this link.


If your utility is considering becoming a member of SQUG, the Information for Prospective Members describes the owners group, the beneficial used of the experience-based seismic qualification method developed by SQUG, and the benefits of membership in organization.


History of SQUG and SEQUAL

SQUG was formed in 1982 by U.S. utilities with older nuclear power plants that were subject to resolution of the NRC’s Unresolved Safety Issue (USI) A-46, “Seismic Qualification of Equipment in Operating Plants.”  After developing a cost-effective method of using experience data to resolve this generic issue, other companies, both in the U.S. and internationally, joined SQUG to be able to also apply this method at their facilities.  SQUG also adapted this method for use in seismically qualifying new and replacement equipment in their A-46 plants.

SEQUAL was formed in 1995 for the purpose of extending the use of the SQUG method to the newer nuclear power plants in the U.S. (i.e., the non-A46 plants).  SQUG and SEQUAL merged into a single organization (SQUG) in 2003.

A comprehensive summary of the History of SQUG is also provided.



Organization and Management of SQUG

Leadership of the SQUG owners group is provided by a Steering Group composed of member representatives who volunteer their time to set policy, guide the expenditure of resources, and review/approve technical work prepared by contractors.

The Electric Power Research Institute (EPRI) provides the administrative and technical umbrella under which the owners group operates.  An EPRI Program Manager administers this owners group with support from SQUG contractors.

Each SQUG member company has designated representatives from within their organization to speak and vote on their utility’s behalf and serve as points of contact between their company and the owners group.

Links to lists of contacts for the Steering Group and member representatives are listed below.  However, note that these lists may only be accessed by member representatives who are registered uses of this web site.  If you are not a registered user and want additional information, send an email to the SQUG webmaster at squgwebmaster@mpr.com

·      Steering Group Contacts

·      SQUG Contractor Contacts


Last Updated: 11/30/2018

Quick Links

Introduction to SQUG

History of SQUG

Info for Prospective Members


For Members Only

Steering Group Contacts

SQUG Contractor Contacts

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Questions or comments? E-mail: squgwebmaster@mpr.com.