ML15099A291

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4/22/2015, Enclosure 2, Slides for TVA Presentation to the NRC in Support of Steam Dryer Replacement
ML15099A291
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 04/22/2015
From:
Tennessee Valley Authority
To:
Plant Licensing Branch II
Saba F DORL/LPL2-2 301-415-1447
Shared Package
ML15099A304 List:
References
Download: ML15099A291 (72)
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ENCLOSURE 2 GE Letter No. 175528-011 GEH Slides for TVA Presentation to the NRC in Support of Steam Dryer Replacement Non-Proprietary Information NON-PROPRIETARY NOTICE This is a non-proprietary version of Enclosure 1 of GEH Letter No. 175528-011 which has the proprietary information removed. Portions of the document that have been removed are indicated by an open and closed bracket as shown here (( )).

Non-Proprietary Information - Class I (Public)

Browns Ferry Nuclear Plant Replacement Steam Dryers Gerry Doyle Director EPU April 22, 2015

Non-Proprietary Information - Class I (Public)

Agenda

  • Introductions G. Doyle
  • Overview and Background G. Doyle
  • Browns Ferry Replacement Steam Dryer P. Donahue Design
  • Browns Ferry Replacement Steam Dryer P. Donahue Analysis
  • Browns Ferry Replacement Steam Dryer P. Donahue Power Ascension Monitoring
  • Browns Ferry Replacement Steam Dryer P. Donahue Inspection Plan
  • Questions/Comments G. Doyle l 2

Non-Proprietary Information - Class I (Public)

Overview and Background

  • New Replacement Steam Dryers (RSDs) will be installed in all three Browns Ferry Units
  • To resolve any issues that existing steam dryers may have under EPU conditions
  • Previous submittals, now withdrawn, had over 260 RAIs associated with steam dryers
  • New EPU License Amendment Request (LAR) submittal will address previous issues , look to minimize RAIs, and support NRC approval
  • Current strategy and design complies with existing and contemporary regulatory requirements
  • Contracted with GEH to build our RSDs as they are the Original Equipment Manufacturer and have experience in other recent RSDs
  • We are here to present an overview of our RSDs design, analysis, monitoring plan and inspection plan with an expectation that NRC fully understands the RSD information we plan to submit as part of our EPU LAR
  • Presenter is Pete Donahue, Senior Manager for EPU Engineering
  • Supported by GEH personnel l 3

Non-Proprietary Information - Class I (Public)

BFN Replacement Steam Dryer

  • Based on the curved hood six bank prototype replacement dryer first used in a BWR/4 reactor.
  • Design is significantly more robust than the original steam dryer it replaces.
  • BFN acoustic load definition developed using MSL acoustic pressure measurements taken at the three Browns Ferry units.
  • The FIV fatigue evaluation and primary stress methodologies used for BFN RSD analysis has been reviewed in detail on BWR/6 RSD and ESBWR projects.
  • Analyzed for the applicable primary structural loads for normal operation and for transient and accident conditions.

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Browns Ferry RSD Design

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EPU Replacement Dryer Experience Successful operating history for replacement dryers at EPU

  • Quad Cities Units 1/2 RSD
  • Dresden Units 2/3 RSD
  • Susquehanna Units 1/2 RSD
  • Grand Gulf RSD
  • Vermont Yankee original dryer with modifications l 6

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Steam Dryer Structural Design Timeline

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Steam Dryer Structural Design Timeline

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Steam Dryer Structural Design Timeline

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BFN Replacement Dryer Design

  • Based on the curved hood six bank prototype replacement dryer first used in a BWR/4 reactor.
  • Design is significantly more robust than the original steam dryer it replaces.
  • Both the Browns Ferry reactor vessel and the BWR/4 reactor vessel where the BWR/4 prototype RSD was installed have the same internal diameter; so in essence,

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BFN Replacement Dryer Design

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  • Changes to prototype dryer design
  • Dryer/vessel interface changes
  • Address OE lessons learned
  • Stress reduction

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BFN Replacement Dryer Design

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BFN Replacement Dryer Design

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BFN RSD Design Improvement

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BFN RSD Design Improvement

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BFN RSD Design Improvement

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BFN RSD Design Refinement

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BFN RSD Design Refinement

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BFN RSD Design Refinement

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BFN RSD Design Refinement

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BFN RSD Design Refinement

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BFN RSD Design Refinement

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Browns Ferry RSD Analysis

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BFN RSD Analysis Overview

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Browns Ferry RSD Load Definition

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BFN RSD Analysis Load Definition

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BFN RSD Analysis Load Definition

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BFN RSD Analysis Load Definition

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BFN RSD Analysis Load Definition

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Potential SRV Resonance Frequencies

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SRV Resonance Fundamental Frequency

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MSL Acoustic Mode Interaction

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MSL Acoustic Mode Interaction

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Postulated SRV Resonances

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SRV Adders for Design Load Definition

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EPU SRV Scale Factor

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EPU SRV Scale Factor

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BFN RSD Analysis Load Definition

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Dryer Load Comparison

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BFN RSD Analysis Load Definition

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BFN RSD Analysis Load Definition

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BFN RSD Analysis Load Definition

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BFN RSD Analysis Load Definition

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BFN RSD Analysis Load Definition

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BFN RSD Analysis Load Definition

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Browns Ferry RSD FIV Analysis

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BFN RSD Finite Element Model

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BFN-Specific Design Improvements

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BFN-Specific Design Improvements

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BFN-Specific Design Improvements

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BFN RSD FEM Mesh Convergence

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BFN RSD FIV Analysis

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BFN RSD FIV Analysis

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End to End Bias and Uncertainty

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End to End Bias and Uncertainty

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FIV Stress Adjustment

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FIV Stress Adjustment

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BFN RSD Fatigue Analysis Results

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Browns Ferry RSD Primary Stress Evaluation

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BFN RSD Primary Stress Evaluation

  • The steam dryer is a non-safety related item and is classified as an Internal Structure as defined in ASME Subsection NG, Paragraph NG-1122.
  • The steam dryer is not an ASME Code component, but ((

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Non-Proprietary Information - Class I (Public)

Service Load Load Case Operating Condition Conditions Combination A Normal Normal Operations ((

B-1 Upset Turbine Stop Valve Closure (Acoustic Load)

Turbine Stop Valve Closure (Flow Reversal B-2 Upset Load) BFN RSD B-3 Upset Operating Basis Earthquake Primary Stress B-4 Upset Upset DP Analysis Load C-1 Emergency Emergency DP Combinations Main Steam Line Break Outside Containment D-1 Faulted plus SSE (High Power)

Main Steam Line Break Outside Containment D-2 Faulted plus SSE (High Power)

Main SteamLine Break Outside Containment D-3 Faulted (Interlock)

Main Steam Line Break Outside Containment D-4 Faulted (Interlock or Hot Standby)

D-5 Faulted Main Steam Line Break Outside Containment (Hot Standby) ))

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BFN RSD Primary Stress Results

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Browns Ferry RSD Power Ascension Monitoring

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BFN Power Ascension Monitoring

  • The BFN lead unit is classified as a ((

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  • Power ascension monitoring process similar to previous RSD projects
  • Both RSD and MSLs instrumented
  • Monitor using on-dryer pressure transducers, strain gauges, and accelerometer l 64

Non-Proprietary Information - Class I (Public)

BFN Power Ascension Monitoring

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  • Confirmatory structural analysis for lead unit at EPU ((

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  • Follow-on Units

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  • Confirmatory structural evaluation (( ))

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BFN RSD Instrumentation Locations

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BFN RSD Instrumentation

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BFN RSD Inspection Plan

  • During the first two scheduled refueling outages after reaching EPU conditions, a visual inspection will be conducted on the replacement steam dryer for each unit.

The inspection plan will be consistent with the industry guidance. The inspection plan will include all accessible exterior and interior critical locations identified in the vibration and stress analyses for the Browns Ferry RSDs.

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Acronyms Non-Proprietary Information - Class I (Public)

Short Form Description Short Form Description ASME American Society of Mechanical MPC Multi Point Constraint Engineers MSL Main Steam Line ASR Alternating Stress Ratio MSLB Main Steam Line Break AVS Acoustic Vibration Suppressor OBE Operating Basis Earthquake BFN Browns Ferry Nuclear Plant PBLE Plant Based Load Evaluation BWR Boiling Water Reactor PBLE01 PBLE Input On-Dryer Based CLTP Current Licensed Thermal Power PBLE02 PBLE Input MSL Based DP Differential Pressure PSD Power Spectral Density DW Deadweight RMS Root-Mean-Squared EPU Extended Power Uprate RPV Reactor Pressure Vessel FE Finite Element RSD Replacement Steam Dryer FEM Finite Element Model SDAR Steam Dryer Analysis Report FIV Flow Induced Vibration SG Strain Gauge FRF Frequency Response Function SRV Safety Relief Valve HF High Frequency SSE Safe Shutdown Earthquake IN Information Notice TSV Turbine Stop Valve LAR License Amendment Request VFD Variable Frequency Drive LF Low Frequency VPF Vane Passing Frequency MASR Minimum alternating stress ratio l 70

Thank you!

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