ENCLOSURE 10

Update of the INPO Update of the INPO Transformer/Switchyard Review Transformer/Switchyard Review

Visit ProgramVisit Program

Clair GoddardClair GoddardDirector, Plant Technical SupportDirector, Plant Technical SupportNRC Public Meeting January 2006NRC Public Meeting January 2006

ADAMS/ACCESSION NO.: ML060170650

PurposePurpose

To provide an overview of To provide an overview of INPO’sINPO’s transformer, transformer, switchyard and grid (TSG) review visit program switchyard and grid (TSG) review visit program and results.and results.

Program BackgroundProgram Background

INPO activities related to the transformer, INPO activities related to the transformer, switchyard, and grid initiativeswitchyard, and grid initiative::

Analysis of Operating ExperienceAnalysis of Operating Experience

Develop and Issue Significant Operating Experience Develop and Issue Significant Operating Experience Reports (Reports (SOERsSOERs))

Transformer/Switchyard Review VisitsTransformer/Switchyard Review Visits

Plant EvaluationsPlant Evaluations

SOER Development OverviewSOER Development Overview

Significant Operating Experience Reports Related Significant Operating Experience Reports Related to the TSG Initiative:to the TSG Initiative:

•• SOER 99SOER 99--1 “Loss of Grid”1 “Loss of Grid”

•• SOER 02SOER 02--3 “Large Power Transformer Reliability”3 “Large Power Transformer Reliability”

•• SOER 99SOER 99--1A “Loss of Grid 1A “Loss of Grid –– Addendum”Addendum”

SOER GoalSOER Goal

SOER recommendations establish barriers to:SOER recommendations establish barriers to:

Minimize potential for eventsMinimize potential for events

Minimize consequences should an event occurMinimize consequences should an event occur

Equipment Reliability is a Key FocusEquipment Reliability is a Key Focus

SOER ImplementationSOER Implementation

INPO members are obligated to implement SOER INPO members are obligated to implement SOER recommendationsrecommendations

Evaluation of typical SOER recommendations is within Evaluation of typical SOER recommendations is within scope of evaluation teamsscope of evaluation teams

SOER 99SOER 99--1 scope was revised based on lessons learned 1 scope was revised based on lessons learned from industry events from industry events

TSG review visits were implemented due to increased TSG review visits were implemented due to increased scope of SOER scope of SOER

Review Visit OverviewReview Visit OverviewSeparate from plant evaluations; however it is evaluativeSeparate from plant evaluations; however it is evaluative

One week, inOne week, in--depth, team review ondepth, team review on--sitesite

Peers include industry expertsPeers include industry experts

Use INPO Performance Objectives and Criteria and industry Use INPO Performance Objectives and Criteria and industry developed technical guidelinesdeveloped technical guidelines

INPO guidance for performing review visits developed with INPO guidance for performing review visits developed with industry input industry input –– posted on INPO member Websiteposted on INPO member Website

FollowFollow--up during next INPO evaluationup during next INPO evaluation

TSG Review Visit Focus AreasTSG Review Visit Focus Areas

Communication/coordination with grid Communication/coordination with grid operatorsoperators

Adequacy/operability of offsite powerAdequacy/operability of offsite power

Predictive (Predictive (PdMPdM) and preventive ) and preventive maintenance (PM) for large power maintenance (PM) for large power transformers and switchyard transformers and switchyard equipmentequipment

Review Visit Results To DateReview Visit Results To Date14 visits have been completed14 visits have been completed

Focus is on improvements to achieve excellence Focus is on improvements to achieve excellence in performance in performance

Overall findings from the visits can be grouped as: Overall findings from the visits can be grouped as:

86% were recommended improvements86% were recommended improvements

14% were beneficial practices14% were beneficial practices

Recommendation HighlightsRecommendation Highlights

Communication/coordination with grid Communication/coordination with grid

operators examples:operators examples:

Improvements needed in interface proceduresImprovements needed in interface procedures

Improvements needed with procedures for the Improvements needed with procedures for the exchange, review, and analysis of engineering dataexchange, review, and analysis of engineering data

Improvements needed with communicating the status of Improvements needed with communicating the status of the real time contingency analysis programthe real time contingency analysis program

Recommendation HighlightsRecommendation Highlights

Adequacy/operability of offsite power Adequacy/operability of offsite power examples:examples:

Design calculations did not demonstrate preferred offsite Design calculations did not demonstrate preferred offsite power source would be maintained.power source would be maintained.

Plant design change process did not review transmission Plant design change process did not review transmission system modifications to offsite power systems.system modifications to offsite power systems.

Grid operator analysis tools and plant design calculations Grid operator analysis tools and plant design calculations used different post trip contingency loading conditions.used different post trip contingency loading conditions.

Recommendation HighlightsRecommendation HighlightsPredictive (Predictive (PdMPdM) and preventive ) and preventive maintenance (PM) for large power maintenance (PM) for large power transformers and switchyard equipment transformers and switchyard equipment examples:examples:

Improvements needed with adequacy of spare Improvements needed with adequacy of spare transformers and replacement plans.transformers and replacement plans.

Improvements needed in emergent and planned Improvements needed in emergent and planned maintenance risk assessments.maintenance risk assessments.

include transmission system component maintenance include transmission system component maintenance deferralsdeferralsinclude component operational limitationsinclude component operational limitationsdetail of package work scope detail of package work scope

Beneficial Practice HighlightsBeneficial Practice Highlights

Switchyard oversight committeesSwitchyard oversight committees

Detailed guidelines for communication and work Detailed guidelines for communication and work planning include single points of contactplanning include single points of contact

The probability risk assessment model includes The probability risk assessment model includes substation detailssubstation details

Scrams Related to Grid, Switchyard, & Transformer Events

3 3 2

15

6

32 2 2

11

8

2

75 6

9

24

1210 10

35

16

9

2000 2001 2002 2003 2004 2005

Grid Scrams SWYD Scrams XFMR Scrams Totals