New Seismic Design And Evaluation Criteria For The Department Of Energy

Seismic design and evaluation criteria are based on probabilistic performance goals for Department of Energy (DOE) facilities across the United States. These criteria, utilize probabilistic seismic hazard curves for specification of earthquake loading combined with deterministic response evaluation methods and permissible behavior limits. Through the use of such a design/evaluation approach, it may be demonstrated that there is high likelihood that probabilistic performance goals can be achieved. These criteria have been described in previous technical papers. The purpose of this paper is to present proposed modifications to DOE seismic design and evaluation criteria. These modifications account for various slopes of seismic hazard curves, make corrections to earlier versions, and take advantage of an improved quantitative basis for the acceptance criteria.

For DOE facilities across the United States, seismic design and evaluation criteria are based on probabilistic performance goals. In addition, other programs such as Advanced Light Water Reactors, New Production Reactors, and IPEEE for commercial nuclear power plants utilize design and evaluation criteria based on probabilistic performance goals. The use of probabilistic performance goals is a departure from design practice for commercial nuclear power plants which have traditionally been designed utilizing a deterministic specification of earthquake loading combined with deterministic response evaluation methods and permissible behavior limits. Approaches which utilize probabilistic seismic hazard curves for specification of earthquake loading and deterministic response evaluation methods and permissible behavior limits are discussed in this paper. Through the use of such design/evaluation approaches, it may be demonstrated that there is high likelihood that probabilistic performance goals can be achieved. 12 refs., 2 figs., 9 tabs.

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It is the policy of the Department of Energy (DOE) to design, construct, and operate DOE facilities so that workers, the general public, and the environment are protected from the impacts of natural phenomena hazards (NPH). Furthermore, DOE has established explicit goals of acceptable risk for NPH performance. As a result, natural phenomena hazard (earthquake, extreme wind, and flood) design and evaluation criteria for DOE facilities have been developed based on target probabilistic performance goals. These criteria include selection of design/evaluation NPH input from probabilistic hazard curves combined with commonly practiced deterministic response evaluation methods and acceptance criteria with controlled levels of conservatism. For earthquake considerations, conservatism is intentionally introduced in specification of material strengths and capacities, in the allowance of limited inelastic behavior, and by a seismic scale factor. Criteria have been developed following a graded approach for several performance goals ranging from that appropriate for normal-use facilities to that appropriate for facilities involving hazardous or critical operations. Performance goals are comprised of qualitative expressions of acceptable behavior and of target quantitative probabilities that acceptable limits of behavior are maintained. The criteria are simple procedures but have a rigorous basis. This paper addresses DOE seismic design and evaluation criteria.

The National Ignition Facility (NIF) is being built at the Lawrence Livermore National Laboratory (LLNL) as an international research center for inertial confinement fusion (ICF). This paper will provide an overview of NIF, review NIF seismic criteria, and briefly discuss seismic analyses of NIF optical support structures that have been performed by LLNL and the Ralph M. Parsons Company, the Architect and Engineer (A & E) for NIF. The NIF seismic design and evaluation criteria is based on provisions in DOE Standard 1020 (DOE-STD-1020), the Uniform Building Code (UBC), and the LLNL Mechanical Engineering Design Safety Standards (MEDSS). Different levels of seismic requirements apply to NIF structures, systems, and components (SSCs) based on their function. The highest level of requirements are defined for optical support structures and SSCs which could influence the performance of optical support structures, while the minimum level of requirements are Performance Category 2 (PC2) requirements in DOE-STD-1020. To demonstrate that the NIF seismic criteria is satisfied, structural analyses have been performed by LLNL and Parsons to evaluate the responses of optical support structures and other SSCs to seismic-induced forces.