ML16277A621

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GSI-191 Closure Plan: September 28, 2016 - Meeting Slides
ML16277A621
Person / Time
Site: Palisades Entergy icon.png
Issue date: 09/28/2016
From:
Entergy Nuclear Operations
To:
Division of Operating Reactor Licensing
Rankin J
References
Download: ML16277A621 (37)
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Text

Palisades GSI-191 Closure Plan September 28, 2016 1

Introduction of Entergy Team

  • Otto Gustafson - Director, Regulatory Assurance and Performance Improvement
  • Bob White - Supervisor, Design Engineering
  • Steve Mongeau - Technical Lead
  • Amy Hazelhoff - Licensing Support
  • Bruce Letellier - Alion Science
  • Janet Leavitt - Alion Science 2

Agenda

  • Purpose of Meeting
  • Background
  • Strategy Summary
  • RoverD Closure Key Process Steps

- CASA Grande

- Thermal hydraulics

- Probabilistic risk assessment

- Testing

- Licensing actions

  • Current LAR Submittal Schedule 3

Purpose of Meeting

  • Present key elements of Palisades GSI-191 closure plan
  • Summarize plant specific RoverD process steps
  • Provide future communication plans

- Discuss possible constraints that can impact current schedule

  • Pilot Plant Safety Evaluation
  • Acceptance of Palisades specific aluminum release equation

- Current LAR submittal schedule 4

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Background===

  • Palisades

- 2 Loop Combustion Engineering NSSS

- NaTB Buffer 5

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Background===

NaTb Baskets NaTb Baskets Strainer Modules A, B Strainer Modules C, D Containment Ground Level - 590 El.

6

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Background===

2007 2008 2009 2010 Replaced original sump screens with increased surface area and 0.045 hole size As-Built strainer failed flume test under prescribed debris and chemical loads Replaced strainers installed in 2007 with same configuration but 0.095 hole size.

PNP provided responses to initial draft RAIs for GSI-191 closure 7

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Background===

2011 2012 2013 2014 to Present Continued work on closure of open RAIs and planning of insulation modifications PNP selected the risk-informed approach to GSI-191 closure -

SECY 12-0093 Option 2 PNP has been following the risk informed pilot plant and applying lessons learned 8

Strategy Summary Risk-Informed Resolution

  • Strainer will not pass with deterministic DBA loading day spray WCAP-16530-NP chemical quantity
  • Using current aluminum inventory arguments

- Max debris load break

  • Worst-case design basis break

- Max unqualified coatings

  • Strategy for Success:

- Add plant-specific fidelity for chemical load AND

- Ensure strainer performance for debris generation from the highest frequency breaks 9

Risk-Informed Paths Full Risk Informed RoverD Preparation Plant CAD model Sump performance analysis Coating inventory Water volume Chemical load Past strainer tests Initial risk quantification One key strainer test Sliding fiber load WCAP for fuel blockage WCAP for boric acid PRA for LERF Current NRC review 10

Key RoverD Process Steps

  • CASA Grande
  • Thermal hydraulics
  • Testing
  • Licensing actions 11

RoverD Closure Option Insulation Type Color in Figure Volume Cal-Sil Red Medium Site Manufactured Fiberglass Green Low Nukon Yellow Medium Thermal Wrap Brown High Mineral Wool Magenta Low Unibestos*

Blue Low RMI Silver N/A 12

CASA Grande RoverD Threshold Analysis 13 20% with Cal-Sil

CASA Grande RoverD Threshold Analysis 14

CASA Grande RoverD Threshold Analysis 15

CASA Grande RoverD Threshold Analysis 16 Cal-Sil limit consistent With RoverD fiber limit RoverD fiber limit

Conventional Debris Deterministic Test Range

  • ECCS performance test for breaks <10-in diam keeps RoverD risk in Region III.
  • Combined cal-sil and fiber limits keeps test loads consistent with plant ZOI
  • Qualified coatings damage also bounded by RoverD ZOI size Notional Test Load 17

Key RoverD Process Steps

  • CASA Grande
  • Thermal hydraulics
  • Testing
  • Licensing actions 18

Thermal Hydraulics

  • MAAP fidelity improvements
  • Containment response library

- Insights and margin assessment

- In-fuel fiber blockage limits

- Boric acid solubility

  • FSAR Temperature Profile for Chemical Product Inventory 19

Key RoverD Process Steps

  • CASA Grande
  • Thermal hydraulics
  • Testing
  • Licensing actions 20

Role of CAFTA/SAPHIRE PRA

  • Quantifies baseline risk for perfect plant with no debris effects
  • Quantify probability of plant damage states (pumps out of service, etc.)
  • Quantify credit for operator action
  • Trace additional contributors to LERF 21

Key RoverD Process Steps

  • CASA Grande
  • Thermal hydraulics
  • Testing
  • Licensing actions 22

Purpose of Testing

  • Demonstrate successful strainer performance for deterministic debris loads that are consistent with guidance
  • Some flexibility under RoverD to select conventional debris loads, but challenges remain with aluminum corrosion products 23

Deterministic Precipitate Load Industry Practice

  • 30-day FSAR temperature history
  • 30-day spray operation
  • Conservative pH condition
  • Conservative material exposure
  • No credit for solubility
  • No credit for inhibition
  • WCAP-16530 30-day precipitate quantity Palisades Application
  • 30-day FSAR temperature history
  • 30-day spray operation
  • Conservative pH condition
  • Conservative material exposure
  • No credit for solubility
  • No credit for inhibition
  • Plant-specific 30-day precipitate quantity 24

Palisades Test Program Overview Plant-Specific Aluminum Release (OSU) 25 GSI-191 Risk Quantification Strainer Performance Characterization (ARL)

OSU Program Program Objective

  • Develop Palisades specific 30-day Al release inventory

- Empirical equation or point condition Important Program Details

  • Al release = Al precipitate generation

- No credit for solubility

  • Conducted under OSU QA program approved by Palisades.
  • Program commercially dedicated by Alion and accepted by Palisades
  • Al release is a function of Al corrosion 26

OSU Summary

  • Potential reduction using Palisades specific 30-day aluminum release inventory 0%

25%

50%

75%

100%

WCAP-16530 Palisades' specific Precipitate Load 27

OSU Program Design

  • Evaluate baseline Al corrosion and release under representative conditions
  • Palisades chemistry (NaTB /H3BO3)
  • Temperature (130 - 25 oC)

Solution pH (7.2 - 8.2)

Velocity (0.01 to > 6 ft/s)

  • Duration (Hours up to 30 days)
  • Evaluate changes from base line
  • Inhibition (Si, Ca, PO4)

- Margin Assessment Only

  • Miscellaneous ions (SO4, Cl, Fl, Cu, Zn, Pb)
  • Galvanic and concurrent, non-galvanic corrosion (Cu, Zn, Pb, CS)
  • Thermal cycling 28

OSU Facilities Glass Cell System Time: 0 - 48 hrs T(oC): 85, 55, 25 Velocity: 0.01 - >6 ft/s Electrochemical, weight loss and solution concentration Shaker Table System Time: 0-30 days T(oC): 85, 55, 25 Velocity: fixed Weight loss and solution concentration 29

OSU Facilities Flowing Autoclave system Time: 0 - 24 hrs T(oC): up to 130 Velocity: 0.01 - 0.3 ft/s Weight loss and solution concentration corrosion chamber Sample slots in corrosion chamber preheat section corrosion test section 30

OSU Testing Schedule

  • Active testing in 2016

- Remaining target aluminum release test

- Thermal cycling

- Integrated test

  • NRC Visit Opportunities

- View test facilities

- Test set up

- General test procedure 31

Key RoverD Process Steps

  • CASA Grande
  • Thermal hydraulics
  • Testing
  • Licensing actions 32

Licensing Actions Licensing

Background:

  • Submittal on May 15, 2013

- 6 Commitments

  • 3 completed
  • 3 remain open
  • Submittal on December 18, 2013

- Provided Schedule of Major Milestones

  • Due to Pilot Plant status, schedule is outdated 33

Licensing Actions Path Forward:

  • Proposed Presubmittal Meetings

- Meeting #1 - GSI-191 Closure Overview (Today)

- Meeting #2 - Chemical Corrosion Findings

  • Meeting #2a - Site Visit and Preliminary Data Review (~November 2016)
  • Meeting #2b - Review of Data Findings (~May 2017)

- Meeting #3 - Strainer Testing Methodology/Plan (~June 2017)

- Meeting #4 - LAR Content (~June 2018)

  • Implement Modifications
  • Submit GSI-191 Closure Document 34

PRA 2016 2017 2018 University Testing Submit LAR preparation Strainer Test CASA (RoverD, test-load, mods)

Calculations Test Plan, Analysis, and Interpretation 2018 2019 Current LAR Submittal Schedule Thermal Hydraulics - Margin Assessment 35

Summary

  • Palisades committed to GSI-191 closure
  • Significant plant specific testing occurring
  • Challenges remain
  • Continued dialogue will be key to success 36

Questions/Discussion 37

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