ML102880486

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OL - WBN Unit 2 ACRS Slides - October 6, 2010
ML102880486
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Site: Watts Bar Tennessee Valley Authority icon.png
Issue date: 10/05/2010
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Text

1 WBN2Public Resource From:

Crouch, William D [wdcrouch@tva.gov]

Sent:

Tuesday, October 05, 2010 10:06 AM To:

Shukla, Girija Cc:

Arent, Gordon; Lamb, John; Milano, Patrick; Wiebe, Joel; Poole, Justin; Campbell, Stephen; Freeman, Edwin E; Vigluicci, Edward J; Chandler, Christopher C; Riedl, Christopher John; Brandon, Michael Keyes; Mende, Richard Gregory

Subject:

WBN Unit 2 ACRS Slides - October 6, 2010 Attachments:

ACRS Presentation 10-06-2010 Final.pptx PleasefindattachedtheelectroniccopyoftheslidesfortheOctober6,2010ACRSmeeting.Thepresenterswillbe:Bill Crouch,MasoudBajestani,PeteOlson,JerrySchlessel,KenWelch,RobertPhillips,andSteveHilmes.

IwillbebringinganelectroniccopyofthepresentationonaCDorthumbdrive.Iwouldliketoutilizethiscopyforthe actualpresentationsinceIwillhavebackupslidesthatwillbeusedifquestionsarise.Iwillprovideyouanelectronicand hardcopyofanybackupslidesweendupusing.

Iwillbebringing35fullsizecolorcopiesand50copiesforthepublicwithsixslidesperpage.

IwillbeupstairsattheACRSmeetingroomby8:00am.

William D. (Bill) Crouch (423)3652004WBN (256)7777676Cell

Hearing Identifier:

Watts_Bar_2_Operating_LA_Public Email Number:

128 Mail Envelope Properties (B75BE6D61CDE4A468D264343045CAC4F08499205)

Subject:

WBN Unit 2 ACRS Slides - October 6, 2010 Sent Date:

10/5/2010 10:06:01 AM Received Date:

10/5/2010 10:06:54 AM From:

Crouch, William D Created By:

wdcrouch@tva.gov Recipients:

"Arent, Gordon" <garent@tva.gov>

Tracking Status: None "Lamb, John" <John.Lamb@nrc.gov>

Tracking Status: None "Milano, Patrick" <Patrick.Milano@nrc.gov>

Tracking Status: None "Wiebe, Joel" <Joel.Wiebe@nrc.gov>

Tracking Status: None "Poole, Justin" <Justin.Poole@nrc.gov>

Tracking Status: None "Campbell, Stephen" <Stephen.Campbell@nrc.gov>

Tracking Status: None "Freeman, Edwin E" <eefreeman@tva.gov>

Tracking Status: None "Vigluicci, Edward J" <ejvigluicci@tva.gov>

Tracking Status: None "Chandler, Christopher C" <ccchandler0@tva.gov>

Tracking Status: None "Riedl, Christopher John" <cjriedl@tva.gov>

Tracking Status: None "Brandon, Michael Keyes" <mkbrandon@tva.gov>

Tracking Status: None "Mende, Richard Gregory" <rgmende@tva.gov>

Tracking Status: None "Shukla, Girija" <Girija.Shukla@nrc.gov>

Tracking Status: None Post Office:

TVANUCXVS2.main.tva.gov Files Size Date & Time MESSAGE 789 10/5/2010 10:06:54 AM ACRS Presentation 10-06-2010 Final.pptx 3295608 Options Priority:

Standard Return Notification:

No Reply Requested:

No Sensitivity:

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Recipients Received:

TENNESSEE VALLEY AUTHORITY WATTS BAR NUCLEAR PLANT UNIT 2 1

Advisory Committee on Reactor Safeguards October 6, 2010

Agenda

  • Construction Completion Status - Masoud Bajestani Pete Olson
  • Special Topics 3/4Refurbishment - Jerry Schlessel Ken Welch 3/4Buried Piping - Ken Welch/Robert Phillips 3/4Buried Cable - Steve Hilmes
  • Questions 2
  • Questions Bill Crouch

WBN2 Project Completion Status DSEP FY 2007 FY 2008 FY 2009 FY 2010 O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M FY 2011 FY2012 FY 2013 DSEP TVA Board Decision Ready for Fuel Load April 2012 Construction Reactivation letter TVA Board Decision Full Power Operation October 2012 Regulatory Framework Major Engineering Completed Detailed Project Schedule Commence Principal Construction Activities FSAR Amendment / OL Updated Major Engineering Completed Turbine on Turning Gear - October 2010 Integrated Safeguards Testing - Sept 2011 U2 Emergency Plan Drill - May 2011 Licensing Activity Significant Project Milestone Primary Hydro - May 2011 Hot Functional - August 2011 g

g g

p Fill Ice Condenser - July 2011 3

g j

Containment ILRT-July 2011 Masoud Bajestani

WBN2 Construction Completion Status Engineering Overall Progress - 88% complete Design Modifications - ~ 98% complete Calculations - ~ 88% complete Programs - ~ 79% complete Programs 79% complete Focus Areas Field Support Program Completions Open Item Closure Independent Design Verification Program p

g g

Residual Heat Removal and Component Cooling Systems Experienced Team - Eight Engineers with >25 years experience each Findings 4

Findings Masoud Bajestani

WBN2 Construction Completion Status Improvement Initiatives:

  • Replace All 8 ERCW Pumps to Improve Flow Margin
  • Mitigating Multiple Spurious Shorts
  • Intake Pumping Station Diver Barrier
  • RCS/Pressurizer Weld Mechanical Stress Improvement Process Manual Actions
  • Ice Condenser Glycol Chiller Stress Improvement Process (MSIP)
  • Additional Offsite Power Source
  • Split Pin Replacement Prior to Ice Condenser Glycol Chiller Replacement
  • Double 500 kV Breaker Arrangement in Switchyard Split Pin Replacement Prior to Operation
  • Add ERCW Strainer Bypass for On-Line
  • Improvements to Containment Sump Performance

Maintenance

WBN2 Construction Completion Status Construction Overall Progress - >60% complete Construction Focus Areas Cable Pull Hangers Sense and Sample Lines Refurbishment Activities Critical Path Critical Path o Bulk Work o Four Major Systems (Safety Injection, Chemical Volume Control, Essential Raw Cooling Water, Component Cooling) o Ice Condenser Ice Loading On Track to Complete Construction Activities to Support Current F

l L d S h d l f A il 2012 6

Fuel Load Schedule of April 2012 Masoud Bajestani

WBN2 Construction Completion Status Start-up Testing Overall Progress g

Nine (9) Systems Turned Over to Start-up Test Organization Raw Cooling Water, Condenser Cooling Water, Annuniciators, Foxboro Control System, T

bi

/G t

L b Oil T bi D

i S

l Oil EHC C t

l Ai Turbine/Generator Lube Oil, Turbine Drains, Seal Oil, EHC, Control Air First Pre-operational test scheduled for early fall (Condenser Circulating Water System in November 2010)

Circulating Water System in November 2010)

Integrated Safeguards Test - Perform with Unit 1 on-line after H t F ti l T t

Hot Functional Tests Essential Raw Cooling Water - Flow balance during Unit 1 outage 7

Spring 2011 Pete Olson

Special Topics 8

Refurbishment Program Equipment Scope

  • Safety Related y
  • Active / Passive Refurbishment Program Process Steps
  • Identification Identification
  • Classification
  • Inspection/Evaluation
  • Refurbishment/Replacement p
  • Component/System Testing Required Outcome
  • Plant meets original licensing design and equipment vendor
  • Plant meets original licensing, design and equipment vendor specifications 9

Jerry Schlessel

Refurbishment Program Active Refurbishment Program Status S f R l d V l

( ll

)

34% C l

Safety Related Valves (all types) - 34% Complete Large Safety Related Pumps - 30% Complete Large Safety Related Motors - 40% Complete g

y p

Passive Refurbishment Program Status Program in progress and on schedule Attributes Evaluated Pipes, tanks, orifice, Heat Exchangers, Traps p

g p

Duct Instrument Sensing lines Electrical Penetrations Disconnects and Terminal Blocks 10 Electrical Penetrations, Disconnects and Terminal Blocks No Unexpected Findings To Date Jerry Schlessel/Ken Welch

Buried Piping No additional safety-related buried piping is placed in service by Unit 2 completion.

Unit 2 safety-related underground piping is routed through the Unit 2 pipe tunnel to the Refueling Water Storage Tank or Primary Water Storage Tank.

24 Refueling Water Storage Tank header and 6 Containment Spray test line.

6 Primary Water Makeup pump suction and 3 Primary Water Makeup pump recirculation lines.

pump recirculation lines.

Not in direct contact with soil. Entire length of piping is accessible.

Unit 2 non-safety-related buried piping being placed in service:

Condenser Circulating Water pump supply and discharge lines, cooling tower #2 blowdown and desilting lines.

Generator Hydrogen supply from turbine building secondary control cabinet to turbine building.

11 Ken Welch/Robert Phillips

Unit 2 Pipe Tunnel 12

Buried Piping Integrity and reliable operation of all plant buried piping is d b B i d Pi i I t it P (BPIP) ensured by Buried Piping Integrity Program (BPIP).

The objective of the BPIP is to provide a comprehensive program to reduce the probability and consequences of buried piping failure.

P b

d EPRI R t 1016456 "R d ti f

Program based on EPRI Report 1016456 "Recommendations for an Effective Program to Control the Degradation of Buried Pipe, December 2008.

BPIP established for WBN-1 and all TVA nuclear plants The program addresses external (OD) corrosion and/or degradation of buried piping; it is not intended to address internal (ID) corrosion.

The program applies to safety-related and non-safety-related piping systems.

Anticipatory Program - Replace piping before an issue exists Anticipatory Program Replace piping before an issue exists.

13 Ken Welch/Robert Phillips

Systems with Buried Piping System #

System name System #

System name 014 C

d t

D i

li 032 C

t l Ai 014 Condensate Demineralizer 032 Control Air 015 Steam Generator Blowdown 033 Service Air 018 Fuel Oil 035 Generator Hydrogen Cooling 020 Central Lubricating Oil 036 Secondary Chemical Feed 024 Raw Cooling Water 039 Carbon Dioxide 025 Raw Service Water 040 Station Drainage 026 High Pressure Fire Protection (safety related) 059 Demineralized Water 027 Condenser Circulating Water 067 Essential Raw Cooling Water (safety-related)

(

y

)

028 Treated Water 077 Waste Disposal 029 Potable Water 14 Ken Welch/Robert Phillips

Buried Piping Installation Buried pipe is bedded to provide a continuous and uniform earth bearing from trench bottom to bottom quadrant of pipe.

Trenches are backfilled with rock-free earth or sand compacted to a minimum depth of 12 over top of pipe.

Steel pipe is either coal tar epoxy coated or spiral wrapped using coal-tar protective coating in tape form. Spiral wrap is overlapped more than half-width of the tape to provide a minimum of double thickness of tape.

Pipe is heated to remove moisture prior to wrapping.

Prior to backfilling, externally-coated pipe is inspected for holidays.

15 Ken Welch/Robert Phillips

Buried Piping The Buried Pipe Integrity Program (BPIP) is implemented in six steps:

Steps 1 and 2 establish the program.

1. Establishing site documents/databases.
2. Risk ranking of in-scope pipe segments.

Steps 3 thru 6 ensure adequacy of the piping.

3. Inspections of in-scope piping systems.
4. Fitness-for-service evaluations of inspection results.
5. Identification of repair options for degraded piping.
6. Prevention and mitigation measures for reducing risk of failure.

Steps 3 thru 6 are ongoing throughout the life of the plant.

16 Ken Welch/Robert Phillips

Buried Piping Step 1 - Establish site documents/databases Identify buried lines (any piping branch which has at least one section of buried pipe).

Divide lines into segments and zones:

Segment: A contiguous section of line within the same system containing the same fluid under all operating conditions.

same fluid under all operating conditions.

Zone: A portion of the larger segment that has been reduced into smaller sections for the purpose of evaluating a specific pipe external physical configuration or installation situation.

17 Ken Welch/Robert Phillips

Buried Piping Step 2 - Risk Ranking of Pipe Segments Each zone is assessed for total risk factor.

Risk Factor = Susceptibility Factor x Consequence factor Susceptibility Factors:

Physical configuration.

Cathodic protection.

Pipe material.

Pipe coating.

Internal fluid.

Pressure transients.

Soil and fill characteristics.

Past history.

Consequence factors:

Consequence factors:

Environmental hazards.

Threats to power production.

Cost of repair.

Nuclear safety impacts Nuclear safety impacts.

18 Ken Welch/Robert Phillips

Buried Pipe Step 3 - Inspections of in-scope piping systems.

The GROUPs identified in Figure 2 are defined as:

  • GROUP 1 - Buried piping segments and/or zones in this category should have priority, and the inspection plan should address this buried piping first.

p p g

  • GROUP 2 - Buried piping segments and/or zones in this category should have secondary priority, and the inspection plan should address this buried piping second, unless engineering judgment changes the priority.
  • GROUP 3 - Monitor and record surface conditions of buried piping systems when excavations or repairs are made.
  • GROUP 4 - Monitor and record surface conditions of buried piping systems when excavations or repairs are made. This category has less priority than GROUP 3 19 category has less priority than GROUP 3.

Special emphasis is given to buried piping that contains radioactive materials. These will automatically be placed in Group Special emphasis is given to buried piping that contains radioactive materials. These will automatically be placed in Group 1 or 2.

1 or 2.

Ken Welch/Robert Phillips

Buried Piping Step 4 - Inspection Each TVA site is developing an inspection plan for each site to provide Each TVA site is developing an inspection plan for each site to provide reasonable assurance of integrity of buried piping. The inspection plan includes the following key attributes:

1. Identification of piping segments and/or zones to be inspected.

G

2. Potential inspection techniques such as Guided Wave technology.
3. Inspection schedule for buried piping segments and/or zones based on risk ranking.
4. Assessment of cathodic protection, if applicable.

Plan Implementation Preliminary inspections using Guided Wave testing were completed in June, 2009.

Full implementation of Inspection Plan scheduled start no later than June 2012 Full implementation of Inspection Plan scheduled start no later than June, 2012.

The condition assessment of buried piping containing radioactive materials scheduled completion by June, 2013.

20 Ken Welch/Robert Phillips

Buried Piping Steps 5 and 6 (On-Going Throughout Life Of Plant)

Step 5 - Identification of repair options for degraded piping.

WBN Operating Experience Piping Repair/Replacement To date there has not been any occurrences of major failure (loss of safety related system function).

No impact on system operability or function Step 6 - Prevention and mitigation measures for reducing risk of p

g g

failure.

Groundwater Protection Program 21 Ken Welch/Robert Phillips

Buried Piping TVA Groundwater Protection Program Th f hi i

i i i

h i l f i

d The purpose of this program is to minimize the potential for inadvertent releases to the environment from plant activities.

Provides for a site risk assessment for groundwater protection:

Identifies each system/component that involves licensed material and has a credible Identifies each system/component that involves licensed material and has a credible mechanism for licensed material to reach ground water.

Identifies the leak detection mechanism for any system/component noted above.

Each sites risk assessment is available for review and use by applicable engineering, maintenance planning and other site personnel as a routine ground water risk tool for maintenance planning and other site personnel as a routine ground water risk tool for new designs, changes, or modifications, preventive maintenance work and outage management planning.

GWPP Monitoring Plan including the following constituents:

Monitoring locations Monitoring locations Sampling frequencies Sampling protocols and/or procedures Analytical protocols and/or procedures including sensitivity limits 22 Ken Welch/Robert Phillips

Buried Piping Buried Pipe Conclusions The piping system will maintain reliable operation.

WBN Unit 2 is currently following the industry initiatives for buried piping, which is assessing the conditions, performing risk ranking models and replacing pipe as required.

The TVA fleet has a plan for inspections and assessments to be completed by June 2013.

The type failures that could occur will not challenge the operability of the systems and/or their functions.

To date there has not been any occurrence of major failure (loss y

j

(

of safety related system function).

WBN has processes and procedures to monitor all safety related piping.

p p g 23 Ken Welch/Robert Phillips

Buried Cable

  • TVA Construction Practice: No Process Cables Are Directly Buried In Soil, Regardless Of Safety Class.
  • No Additional Buried Or Underground Safety-Related Power Cable Added By Unit 2
  • Safety-Related Power Cables At WBN That Are Routed Underground Sa e y e a ed o e Cab es a

e ou ed U de g ou d Include:

  • Cables from the Diesel Generator building to the Auxiliary building
  • Cables from the Auxiliary building to the intake pumping station Cables from the Auxiliary building to the intake pumping station
  • All the Safety-Related cables above are routed thru duct banks, and all are currently in service to support Unit 1 operation.
  • Safety-Related signal cables from Refueling Water Storage Tank level transmitters to the Aux building are routed thru divisional conduit in the Refueling Water Storage Tank pipe tunnel, and are not considered to be buried cables 24 buried cables.

Steve Hilmes

Buried Cable Duct Banks Sump pumps have been installed in all underground duct bank manholes.

Safety-related duct banks have local level alarms and pump run Safety-related duct banks have local level alarms and pump run time meters.

Routine operator rounds monitor alarms to ensure prompt id tifi ti d

ti t

t bl b

identification and action to prevent cable submergence.

Manhole sump pump operation is verified once/6 months under plant preventive maintenance program.

25 Steve Hilmes

Buried Cable Testing Medium voltage underground cables are periodically tested using Very Low Frequency (VLF) dissipation factor testing (also known as tan-).

TVA specifications provide specific acceptance criteria for each insulation type For example for Cross Link Polyethylene (XLPE) insulation type. For example, for Cross Link Polyethylene (XLPE) insulated cables, the criteria is:

Tan-at 2Vo Differential of Tan-Assessment Testing Frequency Tan Frequency

< 1.2 E-03

< 0.6 E-03 Good Repeat VLF test within 5 years 1.2 E-03 0.6 E-03 Aged Repeat VLF test annually Acceptance criteria for all insulation types conforms to IEEE 400 2 annually 2.2 E-03 1.0 E-03 Degraded -

replace cable N/A Acceptance criteria for all insulation types conforms to IEEE 400.2.

Steve Hilmes

Buried Cable Testing Results Very Low Frequency (VLF) testing indicates no degradation of safety-related cables.

Results of underground cable testing:

20 d

d di lt f t l t d bl 20 underground medium-voltage safety-related cables.

Tan-testing on all completed in 2008.

All test results were satisfactory, and cables remain on a 5-year test interval.

4 non-safety-related cables for Unit 2 Condenser Circulating Water pumps 4 non safety related cables for Unit 2 Condenser Circulating Water pumps were also tested satisfactorily.

Steve Hilmes

Buried Cable Buried Cable Conclusions WBN performs periodic testing of medium voltage cables and underground duct banks cables The cables will maintain reliable operation.

28 Steve Hilmes

Summary We Have a Solid, Intrusive Program for Both Active and Passive Components We Are Utilizing Internal and External Operating Experience and Industry Programs to Guide the Refurbishment Program Our Goal Is To Have the Highest Operating Capacity Factor After g

p g

p y

Commercial Operation of the Unit.

29 Masoud Bajestani

Watts Bar Unit 2 QUESTIONS 30 Bill Crouch

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