ML111590130

NRC Slides - TMI Public Meeting, June 7, 2011

ML111590130
Person / Time
Site:	Three Mile Island
Issue date:	06/08/2011
From:	Bellamy R NRC/RGN-I/DRP/PB6
To:
bellamy, rr
References
Download: ML111590130 (23)

Text

Three Mile IslandAssessment MeetingThree Mile Island, Unit 1Safety Performance in 2010

&U.S. Nuclear Plant Safety in light of Japan Events2010 Reactor Oversight ProcessNuclear Regulatory Commission

-Region I 1 AgendaIntroductionDiscussion of Three Mile Island safety performanceDiscussion of U.S. nuclear plant safety in light of Japan eventsNRC to address public questionsClosing remarks 2

Exelon operated Three Mile Island safely and in a manner thatpreserved the public health and safety and protected the environment.Licensee Response column of the Action MatrixBaseline inspections planned for 2011NRC Assessment Summary 3

~3800 hours of inspection and related activities2 resident inspectors on site

-residents perform inspections daily and can respond to plant events at any time13 regional inspections3 major team inspectionsPermanent Plant ModificationsManaging Gas AccumulationProblem Identification and ResolutionThree Mile IslandInspection Activities in 2010 4

All Green Performance Indicators9 Green/Severity Level IV inspection findingsNo greater than Green inspection findingsJanuary 1 through December 31, 2010Three Mile IslandPerformance Indicator and Inspection Results 5

Three Mile IslandNRC Action MatrixIncreasing safety significanceIncreasingNRC inspection effortsIncreasing NRC/Licensee management involvementIncreasing regulatory actionsLicensee ResponseRegulatory ResponseDegraded CornerstoneMultiple Repetitive Degraded CornerstoneUnacceptable PerformanceAll Inputs are Green; Cornerstone Objectives Fully Met1 or 2 White Inputs; Cornerstone Objectives Fully Met2 White or 1 Yellow Input; Cornerstone Objectives Met w/ Moderate Degradation in Safety PerformanceMultiple Yellow Inputs or 1 Red Input; Cornerstone Objectives Met w/ Significant Degradation in Safety Performance Overall Unacceptable Performance; Plants not permitted to Operate w/in this Column; Unacceptable Margin to Safety Three Mile Island, Unit 1 operated safelyLicensee Response column of the Action MatrixBaseline inspections planned for 20112010 Three Mile IslandAssessment Summary 7

Three Mile IslandAssessment MeetingU.S. Nuclear Plant Safety in Light of Japan Events 8

Fukushima: Facts We Know Today9.0 Earthquake

-4th largest in the world since 1900Reactors Safely ShutdownSite then hit by a ~40 foot Tsunami Tsunami caused a loss of all electrical power Fukushima: Facts We Know TodayLoss of all electrical power to safety systems eventually led to fuel damageSecondary containment hydrogen explosions visible at Units 1 & 3 several days laterRadiological releases10 U.S. ConsiderationsNo anticipated U.S. Health Effects from FukushimaU.S. nuclear plants remain safe

-NRC requires plants to be designed to withstand external events

-NRC requires a defense

-in-depth approach

-NRC performs independent safety inspections

-NRC assesses new safety information and requires improvements.Methodical and systematic review of Fukushima event 11 Designed forSite Specific Natural EventsEarthquakesTsunamisHurricanesFloodsTornadoes12 The NRC Requires Defense-In-DepthRedundant and diverse safety systemsMultiple physical barriers to contain radioactive materialTesting and inspection of systems important to safetyEmergency planning13 NRC Independent Safety InspectionsReactor Oversight ProgramNRC inspectors have unfettered access to all plant activities related to nuclear safety and securityAt least two full

-time NRC resident inspectors at each nuclear plant NRC specialists conduct additional inspections at each nuclear plant14 NRC Requires Safety ImprovementsNRC assesses new safety information, develops lessons learned, and requires safety enhancements:15NRC operating experience programRulemaking (Station Blackout)Post TMI ActionsPost 9/11 OrdersGeneric Safety Issues NRC Response to Events in Japan NRC response & assistance to Japanese governmentNRC conducting a methodical and systematic review16Near-term actions (~90 days)

-conducted additional inspections

-identifying near term operational issuesLonger-term actions NRC Near-Term ReviewEvaluate Fukushima Daiichi EventsDomestic Operating Reactors and Spent Fuel PoolsStaff briefed the Commission in a public meeting on May 12; second briefing on June 16Final recommendations in public meeting July 1917 NRC Long-Term ReviewSequence of events and the status of equipment during the eventEvaluate all technical and policy issuesEvaluate potential interagency issuesApplicability of lessons learned to non

-operating reactor and non

-reactor facilitiesReport to the Commission within 6 months from the start of the evaluation18 NRC Actions to DateInformation Notice 2011

-05, "Tohoku

-Taiheiyou-Oki Earthquake Effects on Japanese Nuclear Power PlantsEmergent NRC Inspections in Response to Fukushima EventsNRC Bulletin 2011

-01 'Mitigating Strategies'19 SummarySafety of current facilities remains top priorityThe NRC will continue to perform a systematic and methodical review of the Fukushima eventThe NRC will take action based on results of the review to ensure the continued safety of US commercial nuclear power plants20 Meeting Ground Rules 1.Please be respectful to the speaker

-only one speaker at a time 2.See NRC staff if you have procedural questions/concerns or still want to sign up.

3.NRC staff members will be available after the meeting to talk to those interested21 Questions22 Contacting the NRCReport a safety concern1-800-695-7403allegation@nrc.govGeneral questionswww.nrc.govRegion I Public AffairsDiane Screnci, 610

-337-5330 or diane.screnci@nrc.govNeil Sheehan, 610

-337-5331 or neil.sheehan@nrc.gov23