Figure 5-2. Comparison of seismic capacity spectra to seismic demand spectra

DOE-HDBK-1129-99

Functionality Requirements

Does the item need to function during the earthquake?

Does it need to function only after the earthquake?

Can it be placed back into service by operator actions?

Does the item have sufficient capacity to meet the earthquake demand specified for its PC?

An example of a comparison of capacity to demand is shown in Figure 5-2.

Is the item adequately anchored or braced? There are special considerations for base-isolated

or vibration-isolated items since they have behaved poorly during earthquakes.

Does an adequate "Load Path" exist to transfer all seismic loads in addition to operating loads?

A load path is a continuous path, which carries load from the top of a structure or component

down through an element and finally into the foundation. Loads produced by the earthquake

must be combined with normal operating loads such as weight, pressure, temperature, and any

temporary loads that may exist.

Are there system interaction issues?

Can something fall and cause the item not to function?

Can the item impact with nearby items?

Is there differential motion between the item and the structure?

Is there a water spray or flood issue?

Is there a fire issue?

FIGURE 5-2. Comparison of seismic capacity spectra to seismic demand spectra

Each new system or new component must be designed to meet the DOE seismic criteria specified

in DOE Natural Phenomena Policy as specified in Section 4.4. Adequate documentation to

support its design must be maintained by the facility management. Adequate inspection should be