ML043000287

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Presentation from 10/19/2004 Meeting with Exelon Nuclear, Quad Cities Unit 1 Steam Dryer Instrumentation and Refined Acoustic Model
ML043000287
Person / Time
Site: Dresden, Quad Cities  Constellation icon.png
Issue date: 10/19/2004
From:
Exelon Nuclear
To:
Office of Nuclear Reactor Regulation
References
Download: ML043000287 (32)
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Text

. J. - ;i, Exe 1bnSM Nuclear Quad Cities Unit 1 (QC1)

Steam Dryer Instrumentation October 19, 2004 1

ia Exe krn.M Nuclear Introduction John Nosko Project Director, Steam Dryer Replacement 2

  • I Agenda Exe krn.M Nuclear
  • Introduction
  • Steam Dryer Instrumentation Plan
  • Steam Dryer Sensors
  • Refined Acoustic Model
  • Closing Remarks 3

- I Exe k5nSM Nuclear Steam Dryer Instrumentation Plan Keith Moser Corporate Asset Management Engineer 4

Topics Exek(n.

Nuclear

  • Industry Experience
  • Purpose of Dryer Instrumentation
  • Use of Collected Data
  • Static and Impact Testing
  • Sensor Selection and Placement 5

Industry Experience ExekOnsm Nuclear

  • Steam dryer degradation has been experienced across the BWR fleet
  • GE and other utilities have instrumented dryers to collect data under operational conditions
  • Exelon will collect data on the QC1 steam dryer to be used in a comprehensive approach to analyzing steam dryer loading 6

Purpose of Dryer Instrumentation Exekrn.m Nuclear

  • Find areas on the steam dryer with the highest pressure loading

- Pressure sensors placed at high stress locations

  • Verify adequacy of the new steam dryer design

- Strain gauges located to identify maximum stress locations

- Accelerometers located to identify maximum displacement locations

  • Identify steam dryer modal properties

- Impact testing on steam dryer

  • Gain information about the source(s) of loading

- Sensors on main steam lines (MSL)

  • Benchmarking 7

I Use of Collected Data Exekn SM Nucl ear

  • Validate structural adequacy of QC1 steam dryer

- Analyze data from pressure transducers, strain gauges, and accelerometers against design calculations

- Validate design load for QC1 replacement dryer

  • Benchmark predictive tools

- Sensors on the dryer and MSLs are the most comprehensive to date

  • Acoustic circuit with MSL and water reference leg data will be compared against in-vessel data points
  • Scale model test methodology will be benchmarked against QC1 data
  • GE/LMS International acoustic FEM will be benchmarked against the QC1 data 8

Static and Impact Test on Dryer ExekOn.m Nuclear

  • Ambient and submerged tests at fabricator
  • Hammer testing of major parts (hoods, skirt, cover plate, drain channels)
  • Frequencies and mode shapes of the as-built steam dryer
  • Testing to be performed before and after sensor installation
  • Test results will be compared with analytical model
  • Static testing of strain gauges 9

Sensor Selection and Placement (Steam Dryer) Exe kn.M Nuclear Dryer Sensor Locations and Quantities Location Strain Gauges Pressure Sensors Accelerometers Total Drain Channel 2 2 Outer Hood Panel - 270 Deg. 13 13 Outer Hood Panel - 90 Deg 2 5 7 1st Bank Side Panel - 270 Deg 1 1 2nd Bank Hood Panel 1 1 2nd Bank Side Panel 1 1 2 3rd Bank Hood Panel 1 1 Tie Bar 2 2 Skirt 2 4 2 8 Dome 1 1 Dryer Motion Horizontal Motion 4 4 Overall Totals 9 27 6 42 10

Sensor Selection and Placement (MSLs) Exe ksnSM Nuclear Main Steam Line Sensor Locations and Quantities Location Strain Gauges Total MSL-A - 3 Pairs 6 MSL- B 12 Pairs 24 MSL- C 3 Pairs 6 MSL-D 3 Pairs 6 Overall Total 42 Notes:

  • One pair of sensors includes one circumferential gauge and one longitudinal direction gauge at the same location. The circumferential gauge is used to measure the oscillating pressure. The longitudinal gauge will be used to measure the stress due to piping vibration and to correct the pressure measurement due to the Poisson's ratio effect.

11

Sensor Selection and Placement (Past Installations) ExeIOn..,

Nuclear I Strain Gauges I Pressure Sensors I Accelerometers I

_ WOq BWR Location BMD 251-ldl a5tdn 251 251 in_

Drain Channel Skirt 7 ...

4 Dryer Bank Cover Plate Dryer Support Rin5 2 _ _

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_ 8 Seismic Block BM.: Domesti Pla-n_ BW F FoeinPln 147M Tie Bar Dome Total Sens I Main Steam Line Note: Previous installations and data collected on plants at original licensed thermal power levels 12

Sensor Selection and Placement (Steam Dryer - 2700 View) Exek~nSM Nuclear MAVf 'et tO jf i nltWs)

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Sensor Selection and Placement (Steam Dryer - 900 View) Exe 1n.M Nuclear X . iy T uvt4 3* up7Dw 4'

'ROX V-AC. ( LCAO4*S TO-AA 4-VTW) 14 Co3

Sensor Selection and Placement (Steam Dryer - Top View) Exek6nSM Nuclear 2W 15 C-OL

ExelInSM Nuclear Steam Dryer Sensors Mike Mustafa Corporate Engineering Projects 16

Topics Exe InSM Nuclear

  • Sensor Specifications
  • Sensor Cable Routing
  • Wiring Overview
  • Pre-operational Sensor Testing
  • Summary 17

.s, I Sensor Specifications Exe krnsm Nuclear Dryer Pressure Sensors:

  • Maximum Operating Temperature: 660 degrees F
  • Maximum Operating Pressure: 1050 pounds per square inch (psi) at 550 degrees F
  • Radiation:

- Gamma Flux: 101'erg/g (no effect)

- Neutron Flux: 1018 n/cm2 (no effect)

Dryer Accelerometers:

  • Maximum Operating Temperature: 1200 degrees F
  • Maximum Operating Pressure: 1160 psi at 570 degrees F
  • Radiation:

- Gamma Flux: 1011erg/g (no effect)

- Neutron Flux: 1018 n/cm2 (no effect) 18

Sensor Specifications (cont.) Exek6,n Nuclear Dryer Strain Gauges:

  • Maximum Operating Temperature: 600 degrees F
  • Maximum Operating Pressure: greater than 1100 psi
  • Radiation: No vendor data available, however, the same transducers were used in the past with material modifications for thermal expansion compatibility with dryer material Main Steam Line Strain Gauges:
  • Maximum Operating Temperature: 650 degrees F 19

Sensor Cable Routing (Steam Dryer - 2700 View) Exe I(nSM Nuclear 20 Cos

Sensor Cable Routing (Steam Dryer - 900 View) Exer In Nuclear 21 COW~

Wiring Overview Exe InnM Reactor building 595 Nuclear elevation on the South side near the Located in the CRD banks.

Located within top elevation of 10 feet of the the drvwell.

drywell Steam Dryer I Strain Gauge I I Pressure I Transducer I I IAccelerometer I I - _I - _- -_ _ -_ _

Contains the signal Contains charge conditioning converters for equipment- galvanic Accelerometers and separators for PT and Dynamic Pressure JBI and JB2 contain Acc, amplifiers for all Sensors. Wheatstone bridges sensors.

for completing the Strain Gauge circuits.

PT and Acc signals pass through.

Note:

PT - Pressure Transducer Acc - Accelerometer SG - Strain Gauge MSL - Main Steam Line 22

Wiring Overview (cont.)

U0 Exektnsm Nuclear

  • Installation will be reviewed under 10 CFR 50.59 process and normal plant modification procedures
  • Using an existing vessel penetration with plug removed - penetration meets American Society of Mechanical Engineers (ASME) Code requirements

- Cables will be routed through existing vessel penetration

  • No historical loose parts issues resulting from instrumented dryers in the industry
  • Quantity and configuration of instrumentation was established to compensate for potential failed sensors 23

Pre-operational Sensor Testing Exekrnm Nuclear

  • Autoclave tests on dryer sensors prior to assembly in the strings
  • Function check of the data acquisition system prior to shipment to site
  • Function check of the sensors after assembly
  • Insulation resistance test upon arrival at US Tool &

Die

  • Resistance testing and functional check after installation on the dryer
  • Resistance testing and functional check at site 24

Summary Exe InSM Nuclear

  • Other utilities have successfully instrumented dryers for data collection
  • No loose parts have been generated in the industry as a result of instrumenting steam dryers
  • Instrumentation design configuration will allow for useful data collection if some sensors should fail
  • Installation requires no new vessel or containment penetrations 25

Exe krn.M Nuclear Refined Acoustic Model Keith Moser Corporate Asset Management Engineer 26

Refined Acoustic Model ExekrnSM Nuclear

  • Exelon is responding to comments and a request for additional information from the NRC regarding our acoustic circuit model and reports from Continuum Dynamics, Incorporated
  • Providing an update on the status of the acoustic model
  • Conveying actions and schedule update related to the acoustic model 27

Refined Acoustic Model (cont.) Exekr5nlm Nuclear

  • The acoustic circuit model that Exelon submitted to the NRC was the first model developed for steam dryer load definition
  • Design review May 2004 with industry experts

- Higher frequencies - 200 hertz

- Higher steam flows - Dresden Unit 2 (DR2), DR3, and QC2

- Improved transducers on the water reference legs

- Use of strain gauge data - "B" MSL QC2

- Mock-up testing of an instrument line

- Expanded load mesh for FEM

- Load definition that is consistent with damage - FEM results

- Benchmark against scale model test 28

Refined Acoustic Model (cont.) Exeen)sm Nuclear Acoustic circuit model - status

- Latest acoustic circuit - draft report

  • Higher steam flows - DR2, DR3 and QC2
  • Improved transducers on the water reference legs
  • Incorporated mock-up testing results of a instrument line
  • Frequency up to 100 hertz
  • Expanded load mesh 29

Refined Acoustic Model (cont.) ExekL,)n,.

Nuclear Acoustic circuit model - preliminary results predict the observed QC dryer experience on the front hood

- Pre-EPU dryer load definition for QC2 shows that the front hood is below the endurance limit - result based on dynamic FEM partial model with expanded load mesh

- EPU dryer load definition for QC2 shows that the front hood is above the endurance limit - result based on dynamic FEM partial model with expanded load mesh

- Extrapolating the DR plants against QC2 peak loads continues to support operability 30

Refined Acoustic Model (cont.) Exek)nsm Nuclear Upcoming actions for acoustic circuit analysis

- Benchmarking against GE scale model test is underway (November 2004)

  • Apply lessons learned from benchmark (November 2004)

- Improve model to achieve 200 hertz frequencies (November 2004)

- Apply acoustic circuit analysis to new dryer with QC2 highest feedwater flow data - Vulnerability Review (December 2004)

- Apply 200 hertz to DR2, DR3 and QC2 (mid-January 2005)

  • Dynamic FEM QC2

- Pre-EPU original dryer

- EPU 2003 repair

- EPU 2004 repair

  • Scale peak loads for Dresden relative to QC2 (mid-January 2005)
  • Continually incorporate new information into DR operability 31

Exe k nSM Nuclear Closing Remarks John Nosko Project Director, Steam Dryer Replacement 32

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