ML16277A621

GSI-191 Closure Plan: September 28, 2016 - Meeting Slides

ML16277A621
Person / Time
Site:	Palisades
Issue date:	09/28/2016
From:	Entergy Nuclear Operations
To:	Division of Operating Reactor Licensing
Rankin J
References
Download: ML16277A621 (37)

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

• WCAP-17788 acceptance

• Acceptance of Palisades specific aluminum release equation

- Current LAR submittal schedule 4

Background

• Palisades

- 2 Loop Combustion Engineering NSSS

- NaTB Buffer 5

Background

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

6

Background

2007 2008 2009 2010 Replaced original As-Built strainer Replaced PNP provided sump screens failed flume test strainers responses to with increased under prescribed installed in 2007 initial draft RAIs surface area and debris and with same for GSI-191 0.045 hole size chemical loads configuration but closure 0.095 hole size.

7

Background

2011 2012 2013 2014 to Present Continued work on closure of open PNP selected the PNP has been RAIs and planning of insulation risk-informed following the risk modifications approach to GSI- informed pilot 191 closure - plant and SECY 12-0093 applying lessons Option 2 learned 8

Strategy Summary

• Strainer will not pass with deterministic DBA loading day spray WCAP-16530-NP chemical quantity

• Using current aluminum inventory arguments

• Using WCAP-16530 corrosion rates

- 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 Risk-Informed Resolution 9

Risk-Informed Paths Full Risk Informed Preparation

- Plant CAD model

- Sump performance RoverD analysis

- Coating inventory - One key strainer test

- Water volume - Sliding fiber load

- Chemical load - WCAP for fuel blockage

- Past strainer tests - WCAP for boric acid

- Initial risk quantification - PRA for LERF

- Current NRC review 10

Key RoverD Process Steps

• CASA Grande

• Thermal hydraulics

• Probabilistic risk assessment

• Testing

• Licensing actions 11

RoverD Closure Option Insulation Type Color in Figure Volume Cal-Sil Red Medium Site Manufactured Green Low Fiberglass Nukon Yellow Medium Thermal Wrap Brown High Mineral Wool Magenta Low Unibestos* Blue Low RMI Silver N/A 12

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

CASA Grande RoverD Threshold Analysis 14

CASA Grande RoverD Threshold Analysis 15

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

Conventional Debris Deterministic Test Range

• ECCS performance test Notional Test Load 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 17

Key RoverD Process Steps

• CASA Grande

• Thermal hydraulics

• Probabilistic risk assessment

• Testing

• Licensing actions 18

Thermal Hydraulics

• MAAP fidelity improvements

• Containment response library

- Insights and margin assessment

• WCAP-17788 (In-Vessel)

- In-fuel fiber blockage limits

- Boric acid solubility

• FSAR Temperature Profile for Chemical Product Inventory 19

Key RoverD Process Steps

• CASA Grande

• Thermal hydraulics

• Probabilistic risk assessment

• 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

• Probabilistic risk assessment

• 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 Palisades Application

• 30-day FSAR temperature

• 30-day FSAR temperature history history

• 30-day spray operation

• 30-day spray operation

• Conservative pH condition

• Conservative pH condition

• Conservative material

• Conservative material exposure exposure

• No credit for solubility

• No credit for solubility

• No credit for inhibition

• No credit for inhibition

• WCAP-16530 surrogate

• WCAP-16530 surrogate precipitate precipitate

• WCAP-16530 30-day

• Plant-specific 30-day precipitate quantity precipitate quantity 24

Palisades Test Program Overview Plant-Specific Aluminum Release (OSU)

GSI-191 Risk Quantification Strainer Performance Characterization (ARL) 25

OSU Program Program Objective Important Program Details

• Develop Palisades specific

• Al release = Al precipitate 30-day Al release inventory generation

- Empirical equation or point - No credit for solubility condition

• 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 100%

75%

Precipitate Load 50%

25%

0%

WCAP-16530 Palisades' specific

• Potential reduction using Palisades specific 30-day aluminum release inventory 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 Shaker Table System

• Time: 0 - 48 hrs

• Time: 0-30 days

• T(oC): 85, 55, 25

• T(oC): 85, 55, 25

• Velocity: 0.01 - >6 ft/s

• Velocity: fixed

• Electrochemical, weight loss and

• Weight loss and solution solution concentration concentration 29

corrosion test OSU Facilities section Flowing Autoclave system corrosion chamber preheat section

• Time: 0 - 24 hrs

• T(oC): up to 130

• Velocity: 0.01 - 0.3 ft/s

• Weight loss and solution Sample slots in 30 concentration corrosion chamber

OSU Testing Schedule

• Active testing in 2016

• NRC Visit Opportunities

- Remaining target aluminum - View test facilities release test - Test set up

- Thermal cycling - General test procedure

- Integrated test 31

Key RoverD Process Steps

• CASA Grande

• Thermal hydraulics

• Probabilistic risk assessment

• 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)

• Submit LAR

• Implement Modifications

• Submit GSI-191 Closure Document 34

Current LAR Submittal Schedule 2016 2017 2018 University Testing Thermal Hydraulics - Margin Assessment PRA CASA (RoverD, test-load, mods)

Strainer Test Plan, Analysis, and Test Interpretation Calculations 2018 2019 LAR preparation Submit 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