ML12159A266

County Generating Station Pre-Application Meeting Extended Power Uprate: Replacement Steam Dryers. June 11, 2012

ML12159A266
Person / Time
Site:	Peach Bottom, LaSalle   (NPF-011, NPF-018, DPR-056)
Issue date:	06/11/2012
From:	Exelon Corp
To:	Office of Nuclear Reactor Regulation
Hector Rodriguez
References
TAC ME7495, TAC ME7496
Download: ML12159A266 (20)

Text

LaSalle County Generating Station Pre-Application Meeting Extended Power Uprate Replacement Steam Dryers June 11, 2012

2 Meeting Purpose and Agenda

Purpose:

Provide the basis for designating LaSalle Units 1 and 2, Peach Bottom Unit 3 replacement steam dryers as non-prototype category 1 (RG 1.20)

Define the approach for signal processing main steam line strain gauge data Agenda:

Replacement Steam Dryer (RSD) Licensing Approach

Basis for Designating LaSalle Units 1 and 2, Peach Bottom Unit 3 RSDs Non-prototype Category 1

Signal Processing Main Steam Line Strain Gauge Data

Contingency Session:

Proprietary Closed Session for NRC Questions

3 Replacement Steam Dryer Licensing Approach

4 Licensing Approach

Regulatory Requirement and Guidance

GDC-1

RG 1.20

RS-001

SRP 3.9.1, 3.9.2 and 3.9.5 Steam dryer performs no safety functions but must retain its structural integrity (SRP 3.9.5)

RG 1.20 Classification Strategy

Peach Bottom Unit 2 designated as prototype

Subsequent units designated non-prototype, category I since they are substantially the same as Peach Bottom Unit 2

• LaSalle Unit 1 and Unit 2

• Peach Bottom Unit 3

5 LaSalle Units 1 & 2, PB Unit 3 Non-Prototype RSDs

RSDs have substantially the same arrangement, design, size, and operating conditions as Peach Bottom Unit 2

Unit specific subscale testing is being performed

Unit specific acoustic circuit modeling and structural analysis will be performed

• Acoustic Circuit Model (ACM) 4.1 to be utilized

• Minimum alternating stress ratio > 2.0 at EPU

Vibration measurement program using Main Steam Line (MSL) strain gauges will be performed

Unit specific power ascension plans and power ascension limit curves will be generated

RSD inspections will be conducted as part of normal reactor vessel internals inspection program and will focus on accessible welds at critical locations

6 Basis for Designating LaSalle Units 1 & 2 And Peach Bottom Unit 3 RSDs Non-Prototype Category 1

7 Basis for Non-Prototype Designation

Evaluate nominal differences between non-prototype and prototype dryers consistent with RG 1.20 Rev.3

Attributes critical to maintaining the structural integrity of the dryer

Dryer Design

Vessel Geometry and Vessel Interface with Dryer

Operating Conditions

Acoustic Excitation and Dynamic Loading

Identify and evaluate differences in critical attributes between prototype and non-prototype dryers

Tables 1 - 4

Demonstrate that differences between prototype and non-prototype dryers have no significant effect on vibratory response and excitation of the dryers. Specifically, the RSDs will be shown to maintain their structural integrity

8 Dryer Design Comparison Table1COMPARISONOFKEYSTEAMDRYERDESIGNPARAMETERSBETWEEN PROTOTYPEANDNONPROTOTYPEDRYERS Peach Bottom 2 Peach Bottom 3 LaSalle 1 LaSalle 2 Dryer Diameter 245 in 245 in 245 in 245 in Dryer Height [nominal]

203 in 203 in 203 in 203 in Dryer Configuration 3-ring octagonal 3-ring octagonal 3-ring octagonal 3-ring octagonal Instrumentation Mast and Brackets Included Not Included Not Included Not Included Hold-down Rods and Brackets Included Not Included Not Included Not Included Perforated Plate Design Same Same Same Same All other steam dryer structural components Same Same Same Same

9 Dryer Design Comparison

The design, material selection and construction of all four replacement steam dryers are substantially similar and all dryers will be subjected to identical manufacturing testing and examinations

Differences at reactor vessel interfaces reflect unit specific vessel design features

- Dryer hold-down brackets (RPV head stops)

- Instrument mast installed for prototype dryer during first cycle of operation

Differences identified will not impact structural integrity of dryer and will be included in the unit specific structural analysis

The dryers will be of the substantially similar design, materials and construction from the same supplier. Any nominal dryer design differences between prototype and non-prototype dryers will be evaluated to ensure no significant effect on vibratory response and excitation of the dryers

10 Vessel Geometry and Vessel Interface Comparison Table2COMPARISONOFKEYREACTORVESSELGEOMETERY/VESSELINTERFACEPARAMETERSBETWEENPROTOTYPEANDNONPROTOTYPE DRYERS PeachBottom2 PeachBottom3 LaSalle1 LaSalle2 VesselInside Diameter

[nominal]

251in.

251in.

251in.

251in.

SteamVolumeUsed inAcousticModelof theSteamDome 7,565ft3 7,565ft3 7,477ft3 7,477ft3 VesselShape(angles betweenMainSteam LinePipes) 36° betweensameside MSLs at72°,108°,252° and288° 36° betweensameside MSLs at72°,108°,252° and288° 36° betweensameside MSLs at72°,108°,252° and 288° 36° betweensame sideMSLs at72°,108°,252° and 288° VesselLugAreas 4 x3 4 x3 5.2 x3 5 x3 RadialDistancefrom outsideofskirtto RPVID 3in 3in 4.2in 4.0in

11 Vessel Geometry and Vessel Interface Comparison

Differences exist in steam volumes used in the acoustic model due to differences in steam dome height dimensions and normal water levels

Steam dome/vessel dimensional differences are scaled in subscale testing

Differences in vessel geometry/interfaces are evaluated by unit specific:

- MSL Excitation Data

- Subscale testing

- Signal Processing

- ACM load definition

- Structural Analysis

- Limit Curve Determination

Unit specific vessel lug analyses will be performed

The nominal vessel geometry and vessel interface differences between prototype and non-prototype dryers will be evaluated in unit specific analysis to ensure no significant effect on vibratory response or excitation of the dryers

12 Operating Conditions Comparison Table3:COMPARISONOFOPERATINGCONDITIONSPARAMETERSBETWEENPROTOTYPEANDNONPROTOTYPEDRYERS PeachBottom2 PeachBottom3 LaSalle1 LaSalle2 PowerLevel 3952MWt 3952MWt 3988MWt 3988MWt SteamFlowRate 16.2Mlbm/hr 16.2Mlbm/hr 17.61Mlbm/hr 17.61Mlbm/hr MSLSteamVelocity 155Ft/sec 155Ft/sec 169Ft/sec 169Ft/sec SteamQuality 99.99%

99.99%

99.99%

99.99%

SteamTemperature

[nominal]

550°F 550°F 550°F 550°F SteamPressure 1050psia 1050psia 1020psia 1020psia Note:Designanalysesperformedat1.02EPUconditions

13 Operating Conditions Comparison

Differences in operating conditions include steam flows and pressure

Differences in operating conditions are evaluated by unit specific:

- MSL Excitation Data

- Subscale testing

- Signal Processing

- ACM load definition

- Structural Analysis

- Limit Curve Determination

The nominal operating condition differences between prototype and non-prototype dryers will be evaluated in unit specific analysis to ensure no significant effect on vibratory response or excitation of the dryers

14 Acoustic Excitation and Dynamic Loading Comparison Table4COMPARISONOFACOUSTICEXCITATIONANDDYNAMICLOADINGPARAMETERSBETWEENPROTOOTYPEANDNON PROTOTYPEDRYERS PeachBottom2 PeachBottom3 LaSalle1 LaSalle2 MSLDiameter 26 OD,RPVtoTSV IDis23.724 RPVtoinboard MSIV,23.864 inboardMSIV toTSV 26 OD,RPVtoTSV IDis23.724 RPVtoinboard MSIV,23.864 inboardMSIV toTSV 26 OD,RPVtoEqualizer 24.1 ID,RPVtoMSIV 26 OD,RPVtoEqualizer 24.1 ID,RPVtoMSIV Length-RPVtofirstsidebranch

[nominal]

55ft 55ft 43ft 43ft BlankStandpipeinternaldiameter 5.19in 5.19in 6.81in 6.81in BlankStandpipeinternalheight 19.64in 19.64in 15.95in 15.95in BlankStandpipe SingleVortexPredictedOnset Velocity 261ft/sec 261ft/sec 381ft/sec 381ft/sec SweepoletRadius 0.75in 0.75in 0.75in 0.75in SRVsidebranchinternaldiameter

[nominal]

Dresser=5in TargetRock=6in Dresser=5in TargetRock=6in Crosby=5in Crosby=5in SRVsidebranchinternalheight Dresser=34.7in TargetRock=38.5in Dresser=34.7in TargetRock=38.5in 23.8in 23.8in Deadendedlegs Yes(MSLsB&C)

Yes(MSLsB&C)

No No SRVStandpipe SingleVortexPredicted OnsetVelocity Dresser=151ft/sec TargetRock=120ft/sec Dresser=151ft/sec TargetRock=120ft/sec 312ft/sec 312ft/sec MSLFlowRestrictors Yes Yes Yes Yes EqualizerAssembly TSVconnection TSVconnection TSVconnection andDRing TSVconnection andDRing

15 Acoustic Excitation and Dynamic Loading Comparison

Acoustic phenomena predicted at

- Peach Bottom: Target Rock, Dresser and Blank Standpipes

- LaSalle: Crosby and Blank Standpipes

Differences in acoustic excitation evaluated by unit specific

- MSL Excitation Data

- Subscale testing

- Signal Processing

- ACM load definition

- Structural analysis

- Limit curve determination

The nominal acoustic excitation and dynamic loading differences between prototype and non-prototype dryers will be evaluated in unit specific analysis to ensure no significant effect on vibratory response or excitation of the dryers

16 Prototype vs. Non-Prototype Dryer Comparison

LaSalle 1 & 2 and Peach Bottom 3 nominal differences from the prototype RSD have been identified and evaluated to assess the impact on dryer structural integrity

It will be demonstrated through design, testing and analysis that the nominal differences have no significant effect on the vibratory response and excitation of the steam dryers

Appropriate to classify LaSalle 1 & 2 and Peach Bottom 3 as non-prototype category I RSDs in accordance with RG 1.20 Rev. 3

17 Signal Processing Main Steam Line Strain Gauge Data

18 Signal Processing MSL Strain Gauge Data

Signal Processing Approach for Steam Dryer High Cycle Fatigue Evaluation

- Identical to QDC ACM 4.1 benchmarking

- Identical to approach utilized for NMP2 EPU approval

- Data reduction details to be provided in WCAP report which will be included in the LAR submittal Signal noise removed from data

• EMF energy (60, 120, 180 and 240Hz) filtered when present in data

• Extraneous non-identified electrical sources as determined by an examination of EIC response filtered when present in data

• Recirculation vane passing frequencies are filtered when present in data

• Coherence filtering applied to the two measurements on each main steam line

19 Contingency Closed Session Meeting Close

20 Acronym List

ACM - Acoustic Circuit Model

ASME - American Society of Mechanical Engineers

BWRVIP - Boiling Water Reactor Vessel Internals Plan

CLTP - Current Licensed Thermal Power

ID - Inside Diameter

EIC - Electrical Interference Check

EMF - Electromagnetic Frequency

EPU - Extended Power Uprate

MSL - Main Steam Line

LAR - License Amendment Request

PB - Peach Bottom Atomic Power Station

RSD - Replacement Steam Dryer

RS - Review Standard

QDC - Quad Cities Generating Station

SR - Stress Ratio

SRP - Standard Review Plan

WCAP - Westinghouse Commercial Atomic Power