This standard provides criteria for the timely retrieval and the subsequent processing, handling, and storage of data obtained from seismic instrumentation specified in ANSI/ANS-2.2- 2002[1].¹⁾ Also included are initial evaluation criteria to determine whether earthquake motion at the site has exceeded the plant's operatingbasis earthquake ground motion (OBE).

This standard does not address procedures for plant walkdowns immediately (within 8 hours) after an earthquake, for ensuring a safe and orderly shutdown, for long-term evaluations of the building and equipment response data, and for subsequently returning the plant to operation. These topics are addressed in ANSI/ANS- 2.23-2002 [2].

¹⁾ Numbers in brackets refer to corresponding numbers in Section 6, "References."

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• ANS 2.2 : Earthquake Instrumentation Criteria for Nuclear Power Plants
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