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{{#Wiki_filter:© Dominion 2006  
{{#Wiki_filter:© Dominion 2006 Regulatory Meeting Internal Flooding Risk Reduction Activities November 30, 2006
©2006Dominion Regulatory Meeting Internal Flooding Risk Reduction Activities November 30, 2006
                                        © 2006
© Dominion 2006  
                                        © Dominion 2006 Dominion
©2003Dominion 3 Introduction Leslie Hartz Site Vice President
 
© Dominion 2006  
Introduction Leslie Hartz Site Vice President
©2003Dominion 4 AGENDAIntroductionLeslie Hartz-Site VPBackgroundLori Armstrong -Director EngineeringPRA HistoryTom Hook -Supv. PRA ModificationsLori Armstrong -Director EngineeringConclusionLeslie Hartz-Site VP
© Dominion 2006
© Dominion 2006  
© 2003 Dominion          3
©2003Dominion 5© Dominion 2006 Internal Flooding Background Lori Armstrong Director Engineering  
 
©2003Dominion 6© Dominion 2006
AGENDA Introduction    Leslie Hartz - Site VP Background      Lori Armstrong - Director Engineering PRA History    Tom Hook - Supv. PRA Modifications  Lori Armstrong - Director Engineering Conclusion      Leslie Hartz - Site VP
© Dominion 2006
© 2003 Dominion           4
 
Internal Flooding Background Lori Armstrong Director Engineering
© Dominion 2006
© 2003 Dominion                 5


===Background===
===Background===
Since 2004 numerous modifications installed reduce risk from Internal Flooding
Since 2004 numerous modifications installed reduce risk from Internal Flooding
*Spring 2005 -Turbine Building Flooding Barrier installation
* Spring 2005 - Turbine Building Flooding Barrier installation
*Fall 2005 -Safeguards Alley Level  
* Fall 2005 - Safeguards Alley Level Alarms
* 2006 - Procedure changes and outage maintenance
© Dominion 2006
© 2003 Dominion                    6
 
Additional Flood Barriers
© Dominion 2006
© 2003 Dominion  7
 
© Dominion 2006
© 2003 Dominion Barrier to Safeguards Alley 8
 
Barrier between Turbine Building and
© 2003 Dominion the far end of Safeguards Alley 9
 
© 2003 Dominion Level Switch Circulating Pump Trip 10
 
Safeguards Alley Flood Level Indication Level switches and alarms for:
A AFW pump room              B AFW pump room DG A room                    DG B room Bus 51/52 room                Bus 61/62 room TD AFW pump room              Cardox room
© Dominion 2006
© 2003 Dominion                11
 
Pre-modification Circulating Water Outlet Expansion Joints
© 2003 Dominion              12
 
Post-modification Circulating Water Outlet Expansion Joint
© 2003 Dominion              13
 
Risk Profile and Safety Improvements Tom Hook Supervisor PRA
© Dominion 2006
© 2003 Dominion          14
 
Flood Risk Contribution as of 12/2004 CDF = 7.2E-04/yr (internal events plus flooding) 95% of total CDF from flooding sequences Dominant CDF Contributors 4.0E-04 3.0E-04 2.0E-04 1.0E-04 0.0E+00 Auxiliary  Turbine  Safeguards    Internal Building  Building Alley Flooding Initiating Flooding  Flooding                Events
© Dominion 2006
© 2003 Dominion                          15
 
PRA Modifications Completed in 2005 Incorporated plant modifications
* Installed flood barriers between Turbine Building and Safeguards Alley
* Installed flood sensors and alarms in Safeguards Alley
* Installed circulating water pump trip on high turbine building level
* Reduced CDF by 4.1E-4/yr Model improvements
* Upgraded flooding models for Auxiliary Bldg and Safeguards Alley to address WOG peer review comments
© Dominion 2006
© 2003 Dominion                              16
 
Flood Risk Contribution as of 12/2005 CDF = 3.1E-04/yr (internal events plus flooding) 92% of total CDF from flooding sequences Dominant CDF Contributors 4.0E-04 3.0E-04 2.0E-04 1.0E-04 0.0E+00 Auxiliary  Turbine  Safeguards    Internal Building  Building Alley Flooding Initiating Flooding  Flooding                  Events
© Dominion 2006
© 2003 Dominion                        17
 
PRA Modifications Completed in 2006 Incorporated procedure changes
* Included new operator actions to address loss of battery room, AFW pump room or safeguards bus ventilation during safeguards flooding
* Included procedure changes enhancing service water isolation
* Reduced CDF by 1.3E-4/yr
© Dominion 2006
© 2003 Dominion                            18
 
Flooding Risk Contribution - Current CDF = 1.8E-04/yr (internal events plus flooding) 82% of total CDF from flooding sequences Dominant CDF Contributors 4.0E-04 3.0E-04 2.0E-04 1.0E-04 0.0E+00 Auxiliary  Turbine  Safeguards    Internal Building  Building Alley Flooding Initiating Flooding  Flooding                  Events
© Dominion 2006
© 2003 Dominion                          19
 
Current Dominant CDF Initiators 4.0E-05 3.0E-05 2.0E-05 1.0E-05 0.0E+00 SW A Fl ood  SW B Spr ay RWST f l ood SW B Spr ay      SW B Fl ood SW B Spr ay  Tr ansi ent  Loss of      Steam    Loss of i n Aux Bl dg on Tr ai n A i n Aux Bl dg i n Aux Bl dg i n Aux Bl dg on Tr ai n A wi th MFW    Component  Gener ator Of f si te 480V Swgr                    Basement                  EDG/ 4kV    Avai l abl e  Cool i ng    Tube    Power Swgr                              Ruptur e Note: SW pipe is seismically qualified.
© Dominion 2006
© 2003 Dominion                                                          20
 
Near Term Risk Reduction Actions z Install watertight door between Auxiliary Building and Safeguards Alley z Install flood level alarms in Auxiliary Building z Relocate risk significant bottom row breakers 15206 and 16206 on 480V buses to spare higher locations z Install spray shields around service water piping in Safeguards Alley to protect 480V and 4kV switchgear from spray
© Dominion 2006
© 2003 Dominion                              21
 
Plant Risk After Proposed Modifications CDF = 6.2E-05/yr 50% of total CDF from flooding sequences Dominant CDF Contributors 4.0E-04 3.0E-04 2.0E-04 1.0E-04 0.0E+00 Auxiliary  Turbine  Safeguards    Internal Building  Building Alley Flooding Initiating Flooding  Flooding                  Events
© Dominion 2006
© 2003 Dominion                          22
 
Impact of Modifications on Dominant CDF Initiators 4.0E-05 Current              Post-Modification 3.0E-05 2.0E-05 1.0E-05 0.0E+00 SW A Flood in SW B Spray RWST f lood SW B Spray SW B Flood in SW B Spray  Transient  Loss of  St eam  Loss of Aux Bldg      on Train A in Aux Bldg in Aux Bldg  Aux Bldg    on Train A wit h MFW Component Generat or Of f sit e 480V Swgr                Basement                EDG/ 4kV  Available  Cooling    Tube    Power Swgr                        Rupt ure Note: SW pipe is seismically qualified.
© Dominion 2006
© 2003 Dominion                                                    23
 
Internal Events Risk Profile since 2004 Core Damage Frequency 1.0E-03 1.0E-04 1.0E-05 12/2004  12/2005      Current  5/2008 Date
© Dominion 2006
© 2003 Dominion                                          24
 
Summary Dominion committed to reduce internal flooding risk at Kewaunee z With proposed modifications, CDF will be reduced by 91% to 6.2E-5/yr z Internal flood contribution after proposed modifications will be 50% of internal events CDF
© Dominion 2006
© 2003 Dominion                        25
 
Modifications Lori Armstrong Director Engineering
© Dominion 2006
© 2003 Dominion          26
 
Installation of Watertight Door Scope:
* Installation of a watertight door between Aux Building and Safeguards Alley Proposed Schedule:
* Door installation during next refueling outage
© Dominion 2006
© 2003 Dominion                      27
 
Installation of Aux Building Water Level Alarms Scope:
* Addition of Auxiliary Building water level alarms Proposed Schedule:
* Installation of level indication 2Q07
© Dominion 2006
© 2003 Dominion                      28


Alarms*2006 -Procedure changes and outage maintenance
Raise breakers on 480V buses 52 and 62 Scope:
©2003Dominion 7© Dominion 2006 Additional Flood Barriers
* Relocate risk significant Class 1E breakers 15206, 16206 from bottom row to higher spare locations Proposed Schedule:
©2003Dominion 8© Dominion 2006Barrier to Safeguards Alley 
* 4Q07
©2003Dominion 9Barrier between Turbine Building and the far end of Safeguards Alley
© Dominion 2006
©2003Dominion 10Level Switch Circulating Pump Trip
© 2003 Dominion                   29
©2003Dominion 11© Dominion 2006 Safeguards Alley Flood Level Safeguards Alley Flood Level Indication Indication Level switches and alarms for:A AFW pump roomB AFW pump roomDG A roomDG B room Bus 51/52 roomBus 61/62 room TD AFW pump roomCardox room
©2003Dominion 12 Pre-modification Circ ulating Water Outlet Expansion Joints
©2003Dominion 13 Post-modification Circulating Wa ter Outlet Expansion Joint
©2003Dominion 14© Dominion 2006 Risk Profile and Safety Improvements Tom Hook Supervisor PRA
©2003Dominion 15© Dominion 2006 Flood Risk Contribution as of 12/2004CDF = 7.2E-04/yr (internal events plus flooding)95% of total CDF from flooding sequencesDominant CDF Contributors0.0E+001.0E-042.0E-043.0E-044.0E-04AuxiliaryBuildingFlooding TurbineBuildingFlooding SafeguardsAlley FloodingInternalInitiatingEvents 
©2003Dominion 16© Dominion 2006 PRA Modifications Completed in 2005 Incorporated plant modifications
*Installed flood barriers between Turbine Building and  Safeguards Alley
*Installed flood sensors and alarms in Safeguards Alley
*Installed circulating water pump trip on high turbine building level
*Reduced CDF by 4.1E-4/yr Model improvements
*Upgraded flooding models for Auxiliary Bldg and Safeguards Alley to address WOG peer review


comments
Install Spray Shields on SW piping Scope:
©2003Dominion 17© Dominion 2006 Flood Risk Contribution as of 12/2005CDF = 3.1E-04/yr (internal events plus flooding)92% of total CDF from flooding sequencesDominant CDF Contributors0.0E+001.0E-042.0E-043.0E-044.0E-04AuxiliaryBuildingFlooding TurbineBuildingFlooding SafeguardsAlley FloodingInternalInitiatingEvents 
* Install spray shields around service water piping in Safeguards Alley Proposed Schedule:
©2003Dominion 18© Dominion 2006 PRA Modifications Completed in 2006 Incorporated procedure changes
* 1Q08
*Included new operator actions to address loss of battery room, AFW pump room or safeguards bus ventilation during safeguards flooding
© Dominion 2006
*Included procedure changes enhancing service water
© 2003 Dominion                   30


isolation*Reduced CDF by 1.3E-4/yr
Summary Dominion continues to reduce internal flooding risk at Kewaunee
©2003Dominion 19© Dominion 2006Flooding Risk Contribution -CurrentDominant CDF Contributors0.0E+001.0E-042.0E-043.0E-044.0E-04AuxiliaryBuildingFlooding TurbineBuildingFlooding SafeguardsAlley FloodingInternalInitiatingEvents CDF = 1.8E-04/yr (internal events plus flooding)82% of total CDF from flooding sequences
* With proposed modifications, CDF will be reduced by 91% since 2004 Dominion will continue to evaluate CDF reductions at Kewaunee
©2003Dominion 20© Dominion 2006 Current Dominant CDF InitiatorsNote: SW pipe is seismically qualified.0.0E+001.0E-052.0E-053.0E-054.0E-05SW A Floodin Aux BldgSW B Sprayon Train A 480V SwgrRWST floodin Aux BldgSW B Sprayin Aux BldgBasementSW B Floodin Aux BldgSW B Sprayon Train AEDG/4kVSwgrTransientwith MFW AvailableLoss ofComponentCoolingSteamGeneratorTubeRupture        Loss ofOffsitePower
© Dominion 2006
©2003Dominion 21© Dominion 2006 Near Term Risk Reduction ActionsInstall watertight door between Auxiliary Building and Safeguards Alley Install flood level alarms in Auxiliary BuildingRelocate risk significant bottom row breakers 15206 and 16206 on 480V buses to spare higher locationsInstall spray shields around service water piping in Safeguards Alley to protect 480V and 4kV switchgear from spray
© 2003 Dominion                   31
©2003Dominion 22© Dominion 2006 Plant Risk After Proposed ModificationsCDF = 6.2E-05/yr50% of total CDF from flooding sequencesDominant CDF Contributors0.0E+001.0E-042.0E-043.0E-044.0E-04AuxiliaryBuildingFlooding TurbineBuildingFlooding SafeguardsAlley FloodingInternalInitiatingEvents 
©2003Dominion 23© Dominion 2006 Impact of Modifications on Dominant CDF Initiators Note: SW pipe is seismically qualified.0.0E+001.0E-052.0E-053.0E-054.0E-05SW A Flood inAux BldgSW B Sprayon Train A480V SwgrRWST floodin Aux BldgSW B Sprayin Aux BldgBasementSW B Flood inAux BldgSW B Sprayon Train AEDG/4kVSwgrTransientwith MFW AvailableLoss ofComponentCoolingSteamGeneratorTubeRupture        Loss ofOffsitePowerCurrentPost-Modification
©2003Dominion 24© Dominion 20061.0E-051.0E-04 1.0E-0312/200412/2005Current5/2008DateCore Damage Frequency Internal Events Risk Profile since 2004
©2003Dominion 25© Dominion 2006 Summary Dominion committed to reduce internal flooding risk at Kewaunee With proposed modifications, CDF will be reduced by 91% to 6.2E-5/yr Internal flood contribution after proposed modifications will be 50% of internal events CDF  
©2003Dominion 26© Dominion 2006 Modifications Lori Armstrong Director Engineering
©2003Dominion 27© Dominion 2006Installation of Watertight Door Scope:*Installation of a watertight door between Aux Building and Safeguards AlleyProposed Schedule:
*Door installation during next refueling


outage
Questions
©2003Dominion 28© Dominion 2006 Installation of Aux Building Water Level Alarms Scope:*Addition of Auxiliary Building water level alarmsProposed Schedule:
© Dominion 2006
*Installation of l evel indication 2Q07
© 2003 Dominion   32}}
©2003Dominion 29© Dominion 2006 Raise breakers on 480V buses 52 and 62 Scope:*Relocate risk significant Class 1E breakers 15206, 16206 from bottom row to higher spare locationsProposed Schedule:
*4Q07
©2003Dominion 30© Dominion 2006 Install Spray Shields on SW piping Scope:*Install spray shields around service water piping in Safeguards AlleyProposed Schedule:
*1Q08
©2003Dominion 31© Dominion 2006 Dominion continues to reduce internal flooding risk at Kewaunee
*With proposed modifications, CDF will be reduced by 91% since 2004 Dominion will continue to evaluate CDF reductions at Kewaunee Summary
©2003Dominion 32© Dominion 2006 Questions}}

Revision as of 12:23, 23 November 2019

11/30/2006 Slides, Internal Flooding Risk Reduction Activities, from Kewaunee Regulatory Public Meeting
ML063460495
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Site: Kewaunee Dominion icon.png
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Text

© Dominion 2006 Regulatory Meeting Internal Flooding Risk Reduction Activities November 30, 2006

© 2006

© Dominion 2006 Dominion

Introduction Leslie Hartz Site Vice President

© Dominion 2006

© 2003 Dominion 3

AGENDA Introduction Leslie Hartz - Site VP Background Lori Armstrong - Director Engineering PRA History Tom Hook - Supv. PRA Modifications Lori Armstrong - Director Engineering Conclusion Leslie Hartz - Site VP

© Dominion 2006

© 2003 Dominion 4

Internal Flooding Background Lori Armstrong Director Engineering

© Dominion 2006

© 2003 Dominion 5

Background

Since 2004 numerous modifications installed reduce risk from Internal Flooding

  • Spring 2005 - Turbine Building Flooding Barrier installation
  • Fall 2005 - Safeguards Alley Level Alarms
  • 2006 - Procedure changes and outage maintenance

© Dominion 2006

© 2003 Dominion 6

Additional Flood Barriers

© Dominion 2006

© 2003 Dominion 7

© Dominion 2006

© 2003 Dominion Barrier to Safeguards Alley 8

Barrier between Turbine Building and

© 2003 Dominion the far end of Safeguards Alley 9

© 2003 Dominion Level Switch Circulating Pump Trip 10

Safeguards Alley Flood Level Indication Level switches and alarms for:

A AFW pump room B AFW pump room DG A room DG B room Bus 51/52 room Bus 61/62 room TD AFW pump room Cardox room

© Dominion 2006

© 2003 Dominion 11

Pre-modification Circulating Water Outlet Expansion Joints

© 2003 Dominion 12

Post-modification Circulating Water Outlet Expansion Joint

© 2003 Dominion 13

Risk Profile and Safety Improvements Tom Hook Supervisor PRA

© Dominion 2006

© 2003 Dominion 14

Flood Risk Contribution as of 12/2004 CDF = 7.2E-04/yr (internal events plus flooding) 95% of total CDF from flooding sequences Dominant CDF Contributors 4.0E-04 3.0E-04 2.0E-04 1.0E-04 0.0E+00 Auxiliary Turbine Safeguards Internal Building Building Alley Flooding Initiating Flooding Flooding Events

© Dominion 2006

© 2003 Dominion 15

PRA Modifications Completed in 2005 Incorporated plant modifications

  • Installed flood barriers between Turbine Building and Safeguards Alley
  • Installed flood sensors and alarms in Safeguards Alley
  • Reduced CDF by 4.1E-4/yr Model improvements
  • Upgraded flooding models for Auxiliary Bldg and Safeguards Alley to address WOG peer review comments

© Dominion 2006

© 2003 Dominion 16

Flood Risk Contribution as of 12/2005 CDF = 3.1E-04/yr (internal events plus flooding) 92% of total CDF from flooding sequences Dominant CDF Contributors 4.0E-04 3.0E-04 2.0E-04 1.0E-04 0.0E+00 Auxiliary Turbine Safeguards Internal Building Building Alley Flooding Initiating Flooding Flooding Events

© Dominion 2006

© 2003 Dominion 17

PRA Modifications Completed in 2006 Incorporated procedure changes

  • Included new operator actions to address loss of battery room, AFW pump room or safeguards bus ventilation during safeguards flooding
  • Reduced CDF by 1.3E-4/yr

© Dominion 2006

© 2003 Dominion 18

Flooding Risk Contribution - Current CDF = 1.8E-04/yr (internal events plus flooding) 82% of total CDF from flooding sequences Dominant CDF Contributors 4.0E-04 3.0E-04 2.0E-04 1.0E-04 0.0E+00 Auxiliary Turbine Safeguards Internal Building Building Alley Flooding Initiating Flooding Flooding Events

© Dominion 2006

© 2003 Dominion 19

Current Dominant CDF Initiators 4.0E-05 3.0E-05 2.0E-05 1.0E-05 0.0E+00 SW A Fl ood SW B Spr ay RWST f l ood SW B Spr ay SW B Fl ood SW B Spr ay Tr ansi ent Loss of Steam Loss of i n Aux Bl dg on Tr ai n A i n Aux Bl dg i n Aux Bl dg i n Aux Bl dg on Tr ai n A wi th MFW Component Gener ator Of f si te 480V Swgr Basement EDG/ 4kV Avai l abl e Cool i ng Tube Power Swgr Ruptur e Note: SW pipe is seismically qualified.

© Dominion 2006

© 2003 Dominion 20

Near Term Risk Reduction Actions z Install watertight door between Auxiliary Building and Safeguards Alley z Install flood level alarms in Auxiliary Building z Relocate risk significant bottom row breakers 15206 and 16206 on 480V buses to spare higher locations z Install spray shields around service water piping in Safeguards Alley to protect 480V and 4kV switchgear from spray

© Dominion 2006

© 2003 Dominion 21

Plant Risk After Proposed Modifications CDF = 6.2E-05/yr 50% of total CDF from flooding sequences Dominant CDF Contributors 4.0E-04 3.0E-04 2.0E-04 1.0E-04 0.0E+00 Auxiliary Turbine Safeguards Internal Building Building Alley Flooding Initiating Flooding Flooding Events

© Dominion 2006

© 2003 Dominion 22

Impact of Modifications on Dominant CDF Initiators 4.0E-05 Current Post-Modification 3.0E-05 2.0E-05 1.0E-05 0.0E+00 SW A Flood in SW B Spray RWST f lood SW B Spray SW B Flood in SW B Spray Transient Loss of St eam Loss of Aux Bldg on Train A in Aux Bldg in Aux Bldg Aux Bldg on Train A wit h MFW Component Generat or Of f sit e 480V Swgr Basement EDG/ 4kV Available Cooling Tube Power Swgr Rupt ure Note: SW pipe is seismically qualified.

© Dominion 2006

© 2003 Dominion 23

Internal Events Risk Profile since 2004 Core Damage Frequency 1.0E-03 1.0E-04 1.0E-05 12/2004 12/2005 Current 5/2008 Date

© Dominion 2006

© 2003 Dominion 24

Summary Dominion committed to reduce internal flooding risk at Kewaunee z With proposed modifications, CDF will be reduced by 91% to 6.2E-5/yr z Internal flood contribution after proposed modifications will be 50% of internal events CDF

© Dominion 2006

© 2003 Dominion 25

Modifications Lori Armstrong Director Engineering

© Dominion 2006

© 2003 Dominion 26

Installation of Watertight Door Scope:

  • Installation of a watertight door between Aux Building and Safeguards Alley Proposed Schedule:
  • Door installation during next refueling outage

© Dominion 2006

© 2003 Dominion 27

Installation of Aux Building Water Level Alarms Scope:

  • Addition of Auxiliary Building water level alarms Proposed Schedule:
  • Installation of level indication 2Q07

© Dominion 2006

© 2003 Dominion 28

Raise breakers on 480V buses 52 and 62 Scope:

  • Relocate risk significant Class 1E breakers 15206, 16206 from bottom row to higher spare locations Proposed Schedule:
  • 4Q07

© Dominion 2006

© 2003 Dominion 29

Install Spray Shields on SW piping Scope:

  • Install spray shields around service water piping in Safeguards Alley Proposed Schedule:
  • 1Q08

© Dominion 2006

© 2003 Dominion 30

Summary Dominion continues to reduce internal flooding risk at Kewaunee

  • With proposed modifications, CDF will be reduced by 91% since 2004 Dominion will continue to evaluate CDF reductions at Kewaunee

© Dominion 2006

© 2003 Dominion 31

Questions

© Dominion 2006

© 2003 Dominion 32

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