Seismic Classification Of Pumps

Pumps that must withstand a safe shutdown earthquake (SSE) and remain functional during and after such an event are designated seismic Category I. Pumps that are not required to remain functional during SSE are designated nonseismic Category I and may be classified as follows:

• Nonseismic Category I pumps are located so their failure or structural deformation might keep a seismic Category I piece of equipment or system from performing its intended function. The analysis methods and seismic input used on nonseismic Category I pumps to show that gross failure or excessive deformations will not occur are identical to those used for seismic Category I equipment.

• Nonseismic Category I pumps are located so their failure or structural deformation cannot affect any seismic Category I system or component. Seismic-related requirements for these pumps, if any, are established using a less stringent seismic environment with the aim of minimizing possible replacement expenses following a credible event.

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