Burns & McDonnell is performing the intake structure design basis reconstitution for Fort Calhoun Nuclear Station. The intake structure is a Seismic Class I structure housing safety-related systems. Burns & McDonnell is providing a comprehensive structural evaluation of the intake structure, which includes:
Perform a comprehensive literature review of plant historical records pertaining to the intake structure.
Develop a complex GTSTRUDL finite element analysis model of the intake structure.
Evaluate the structure for Operating Basis Earthquake (OBE) and Safe Shutdown Earthquake (SSE) loads.
Evaluate for design basis tornado loading as specified in the Fort Calhoun updated safety analysis report (USAR), including complex, time-dependent depressurization analyses.
Evaluate for seismic and tornado-borne missile impacts.
Evaluate for a postulated barge impact event using rigorous nonlinear dynamic analyses, resolving Nuclear Regulatory Commission (NRC) inquiries.
Evaluate structure for all other applicable design-basis loadings.
Heavy load drop evaluations of existing operating floor using NUREG-0612 methodology.
Review and revise the USAR and existing design basis documents.
Identify calculations affected by the design basis reconstitution effort.