ML11188A019

NRC Meeting with NEI Workshop June 28-29, 2011 Enhancements

ML11188A019
Person / Time
Site:	Pilgrim
Issue date:	07/06/2011
From:	Bonner J P Nuclear Energy Institute
To:	Office of Nuclear Reactor Regulation
Basturescu S
Shared Package
ML11187A009	List: ML11188A019 ML11188A072
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Download: ML11188A019 (14)

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Industry Off-Site Power EnhancementsJohn P. BonnerEntergy -Pilgrim Nuclear Station DGV WorkshopJune 28-29, 2011 The woods are lovely, dark and deep, But I have promises to keep, AdiltbfIl A n d m il es t o go b e f ore I s l eep, And miles to go before I sleep. Stopping by Woods on a Snowy EveningRobertFrost INPOSOER 99-1A -"Loss Of Grid, Addendum"Interface between Grid & Plant-Establish agreements, risk reviewsProcedures-Notifications between transmission and site operatorsPreventive Maintenance-Focus on switchyard components for reliable operationDesign Assumptions & Analysis-Mutual review of design changes prior to implementationTraining-Grid operational basics and degraded voltage impactImprove Station Ability To Withstand Grid Disturbances (2004)Potential Complications of LOOPwith Loss of Non-essential Equipment (2004)OEreporting for Switchyard Equipment (2004) 3 INPOTransformer, Switchyard, & Grid (TSG) Review VisitsINPO TSG Review Visits

-Completed at all domestic sites between 2004 and 2009

-Reviewvisitscontinueasfollow

-upreviews(4peryear)andareReview visits continue as follow up reviews (4 per year) and are focused on closing industry performance gaps identified in the self-assessment

-Reviews are part of plant evaluation processIn July 2010, all sites completed a self-assessment to evaluate gaps against industry best practices and submitted report to INPO

-Self-assessment summary results will be shared with industry 4

AREA ACTIVITIESTransmission Owners & Operator & Nuclear Operator InterfaceRegular scheduled site specific interface meetingsJoint meetings with all nuclear facilities and interconnecting transmission ownersSystem outage planning and scheduling meetings Implementation of formal agreements and procedures Agree upon process for notify and mitigation real time and post-contingency (N-1) degraded voltage

conditions 5

ANALYSIS TOOLSPlanning studies which incorporate Nuclear Facilities voltage criteriaPre-maintenance system capability studiesFacility specific dynamic system response studiesReal-time on-line contingency monitoring program (IN 2000-06)Improvement in Nuclear Facilities system load flow analysis capability 6

MODIFICATIONSImprovements in grid voltage support capabilities Improvements to Nuclear Facilities capabilitytorespondtodegradedvoltage capability to respond to degraded voltage conditionsDecreased voltage drop within the Nuclear Facilities 7

IEEEIEEE Standard 741-2007 Annex A provides guidance with respect to:

-Protection of Class 1E equipment for loss and degradedvoltageconditions degraded voltage conditions

-Determining of settings for loss of voltage and degraded voltage protection systems and their time delay

-Provides a description of a protection scheme that would meet the Annex A guidance 8

FERC / NERCThe electrical power industry has developed, approved by industry ballot and i ssued mandatory standards that address unique operat ing requirements of nuclear generating stations These NERC standards have been FERC approved, areauditableandenforceablewithfinancial are auditable and enforceable with financial penalties for non-complianceEOP-005-1 -"System Restoration Plan" (May 2007)Restoration of off-site power as a high-priority NUC-001-2 -"Nuclear Plant Interface Coordination" 9

NUC-001-2Nuclear Plant Interface CoordinationThe standard became effective April 1, 2010 The standard is applicable to all transmission, distribution and generator entities that provide services related to Nuclear Facilities interface requirementsThe standard consists of 9 requirements that require:Requires transmission originations and Nuclear Facilities to agree (NPIR) upon and have agreementtoensureNuclearPlantlicensingrequirementsaremaintained agreement to ensure Nuclear Plant licensing requirements are maintained

.Requires the NPIR to be incorporated into transmission planning and operating analysis Operate the transmission system and the Nuclear Facility per the NPIRCoordinate outage and maintenance activitiesCommunication of proposed transmission or Nuclear Facility modifications, which could impact the NPIRRequires notification and communication protocols 10 RESULTSImprovements in the capability of the grid support Nuclear FacilitiesImprovements in the ability of Nuclear Facilities to operate at lower voltagesDdthidftiNlFilitiD ecrease d th e per i o d o f ti me a N uc l ear F ac iliti es would have to operate with real or potential degraded voltage conditionImproved communication between transmission originations and Nuclear FacilitiesInformation from Generic Letter GL 2006-02 11 CONCLUSIONS -1 The electrical power i ndustry is better informed of the unique operating and post operating requirements of nuclear generating facilities.The electrical power industry has put in place mandatorystandardstoaddressthese mandatory standards to address these requirements. (NERC)Area transmission authorities have established formal process and system monitoring capability to identify and respond to real-time and post contingency degraded voltage conditions.

12 CONCLUSIONS -2Improvements have focused on preventing degraded grid voltage eventsEvents in the past would not likely happen in td'it t o d ay's env i ronmen tNUC-001 -2 represents industry involvement and improvements 13 WHPitK!W e H ave P rom i ses t o K eep!14