About

Innovative Systems Software, LLC (ISS) is a distinguished limited liability company, established in 1996, that specializes in advancing reactor safety analysis and simulation technologies. The organization orchestrates the SCDAP Development and Training Program, a global consortium committed to the enhancement of reactor safety through research, regulatory efforts, and collaborative initiatives.

ISS is globally recognized for its exceptional contributions to reactor safety analysis and the development of thermal-hydraulic systems analysis software. The foundation of the company by Dr. C. Allison, who spearheaded the SCDAP/RELAP5 severe accident code development at the Idaho National Engineering and Environmental Laboratory (INL) from 1981 to 1996, underscored ISS’s commitment to excellence. Dr. Allison’s consultancy roles with the U.S. Nuclear Regulatory Commission (USNRC), Department of Energy (USDOE), and International Atomic Energy Agency (IAEA) further accentuate the firm’s authoritative standing in the field.

Executive and Specialist Team:
C. Allison: General Manager
P. Allison: Financial Manager
J. Hohorst: Specialist in RELAP/SCDAP Training and RELAP/SCDAPSIM Validation
M. Perez: Expert in Uncertainty Analysis and Model Development Training
B. Allison: Information Technology and Computer Programming

Former key personnel include: 
R. Wagner, the lead architect of the RELAP5 code at INL before his tenure at ISS beginning in May 1998 as the lead programmer for RELAP/SCDAPSIM.
L. Siefken specialized in Fuel Behavior and SCDAP Modeling

Other Key Personnel:
P. Allison
J. Hohorst