In August 1998, the Nuclear Regulatory Coml,lission (NRC) approved the final version of a revised rule on the acceptance of emergency core cooling systems (ECCS) entitled 'iEmergency Core Cooling System: Revisions to Acceptance Criteria."" The revised rule states an alternate ECCS performance analysis, based on best-estimate methods, may be used to provide more realistic estimates of plant safety margins, provided the licensee quantifies the uncertainty of the estimates and * Ttlis work WJS fuIIdd hy the US Nuclc,lr l{cg[ll,]~ory Cornlniss ion (NRC), of Tit c of Nll(.

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