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DOE 2000. - Waste Isolation Pilot Plant - U.S. Department of Energy

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WIPP RH PSAR <strong>DOE</strong>/WIPP-03-3174 CHAPTER 5<br />

Table 5.1-4 Initiating Frequency Evaluation Levels<br />

Rank<br />

Frequency<br />

Code<br />

Description<br />

Estimated Frequency <strong>of</strong><br />

Occurrence (yr -1 )<br />

4 Anticipated<br />

(A)<br />

3 Unlikely<br />

(U)<br />

2 Extremely<br />

Unlikely<br />

(EU)<br />

Accidents that may occur several times<br />

during the lifetime <strong>of</strong> the facility<br />

(accidents that commonly occur).<br />

Accidents that are not anticipated to<br />

occur during the lifetime <strong>of</strong> the facility<br />

(e.g., Uniform Building Code-level<br />

earthquake, 100-year flood, maximum<br />

wind gust).<br />

Accidents that will probably not occur<br />

during the life cycle <strong>of</strong> the facility. This<br />

includes the design basis accidents.<br />

10 -1 $ frequency>10 -2<br />

10 -4 < f # 10 -2<br />

10 -6 < f # 10 -4<br />

1 Beyond<br />

Extremely<br />

Unlikely<br />

(BEU)<br />

All other accidents. f # 10 -6<br />

5.1-28 January 22, 2003

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