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{{#Wiki_filter:TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Extended Power Uprate Steam Dryers March 20, 2008 Steam Dryer Analyses AH -ft* Unit 1 Analysis-Submitted March 6, 2008-Includes: o Unit 1 specific strain gage data o Latest bias and uncertainty o FEM corrections o Noise reduction-Results Location Node SR-P SR-a Freq. Shift (%).1 opCoerInerHo"~r co Oerta17 pro,Perf.P ,ate ~ fý88059-.
{{#Wiki_filter:TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Extended Power Uprate Steam Dryers March 20, 2008
30 2. Top Cover/Tie Bar Base 107054 3.47 1.59 10 3. Top Cover/Tie Bar Base 102407 3.29 1.62 2.5 4. Top Cover Middle Hood/Top Perf. Plate/Top Cover Overlap 91420 3.05 1.63 10 5. Top Cover/Tie Bar Base 96561 3.96 1.94 10 6. Top Perf/Top Cover/Dam Plate 103088 4.31 1.98 7.5 7. Submerged Drain Channel/Skirt 104539 2.57 2.15 10 8. Dam Plate/Lock 102521 4.76 2.19 7.5 9. Top Cover Inner Hood/Hood Support/Tie Bar Base 103094 4 2.28 10 10. Top Perf/Top Cover/Dam Plate 103089 5.14 2.4 5 2 Steam Dryer Analyses Unit 2 Analysis-Scheduled to be submitted March 31, 2008-Will include: o Latest bias and uncertainty o FEM corrections" Noise reduction 3 Steam Dryer Analyses Unit 3 Analysis-Scheduled to be submitted June 2008-Will include: o Unit 3 specific strain gage data o Latest bias and uncertainty o FEM corrections o Noise reduction-Outage status o Outage began March 18 o Acoustic vibration suppressors will be installed 0Strain gage data will be obtained following restart 4 Steam Dryer Analyses Potential for SRV Resonance-Frequency range 105 Hz to 112 Hz most likely-No demonstrated SRV resonance at CLTP velocities from plant data-1/5 Scale testing of A & B main steam lines o Testing shows SRV frequency onset starting at CLTP and small increase at EPU Mach numbers-1/8 Scale testing for EPU prediction o In progress" Used to determine need for mitigation modifications 5
 
RAI Status*Group 1 -January 31,2008-Generic questions, plans to use unit-specific data, clarifications
Steam Dryer Analyses                                                                   AH-ft
*Group 2 -March 6, 2008-Unit 1 stress analysis, damping*Group 3 -March 31, 2008-Unit 2 stress analysis, misc.*Group 4 -June 15, 2008-Unit 3 stress analysis 6 Steam Dryer Monitoring Plan" Draft provided for discussion
* Unit 1 Analysis
* Modeled after Vermont Yankee* Includes-Test plateaus at 5%-Power increments of 2.5%-Performance criteria based on limit curves-Proposed license conditions 7}}
  - Submitted March 6, 2008
  - Includes:
o Unit 1 specific strain gage data o Latest bias and uncertainty o FEM corrections o Noise reduction
  - Results Location                           Node   SR-P SR-a Freq. Shift (%)
              .1 opCoerInerHo"~r     co     Oerta17pro,Perf.P ,ate ~ fý88059-. 30
: 2. Top Cover/Tie Bar Base                                     107054   3.47 1.59       10
: 3. Top Cover/Tie Bar Base                                     102407   3.29 1.62       2.5
: 4. Top Cover Middle Hood/Top Perf. Plate/Top Cover Overlap     91420   3.05 1.63       10
: 5. Top Cover/Tie Bar Base                                     96561   3.96 1.94       10
: 6. Top Perf/Top Cover/Dam Plate                               103088   4.31 1.98       7.5
: 7. Submerged Drain Channel/Skirt                             104539   2.57 2.15       10
: 8. Dam Plate/Lock                                             102521   4.76 2.19       7.5
: 9. Top Cover Inner Hood/Hood Support/Tie Bar Base             103094     4 2.28       10
: 10. Top Perf/Top Cover/Dam Plate                             103089   5.14 2.4       5 2
 
Steam Dryer Analyses Unit 2 Analysis
- Scheduled to be submitted March 31, 2008
- Will include:
o Latest bias and uncertainty o FEM corrections
    " Noise reduction 3
 
Steam Dryer Analyses Unit 3 Analysis
- Scheduled to be submitted June 2008
- Will include:
o Unit 3 specific strain gage data o Latest bias and uncertainty o FEM corrections o Noise reduction
- Outage status o Outage began March 18 o Acoustic vibration suppressors will be installed 0Strain gage data will be obtained following restart 4
 
Steam Dryer Analyses Potential for SRV Resonance
- Frequency range 105 Hz to 112 Hz most likely
- No demonstrated SRV resonance at CLTP velocities from plant data
- 1/5 Scale testing of A & B main steam lines o Testing shows SRV frequency onset starting at CLTP and small increase at EPU Mach numbers
- 1/8 Scale testing for EPU prediction o In progress
    " Used to determine need for mitigation modifications 5
 
RAI Status
*Group 1 -January 31,2008
  -     Generic questions, plans to use unit-specific data, clarifications
*Group 2 - March 6, 2008
  -       Unit 1 stress analysis, damping
*Group 3- March 31, 2008
    -Unit     2 stress analysis, misc.
*Group 4 -June 15, 2008
  -       Unit 3 stress analysis 6
 
Steam Dryer Monitoring Plan
" Draft provided for discussion
* Modeled after Vermont Yankee
* Includes
  - Test plateaus at 5%
  - Power increments of 2.5%
  - Performance criteria based on limit curves
  - Proposed license conditions 7}}

Latest revision as of 17:36, 14 November 2019

Summary of March 20, 2008, Meeting with Tennessee Valley Authority Regarding Steam Dryer Portion of the Extended Power Uprate Review (TAC Nos. MD5262, MD5263, and MD5264) - Slides
ML081120510
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 03/20/2008
From:
Tennessee Valley Authority
To:
Office of Nuclear Reactor Regulation
Brown Eva, NRR/DORL, 415-2315
References
TAC MD5262, TAC MD5263, TAC MD5264
Download: ML081120510 (7)
v • d • e


Text

TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Extended Power Uprate Steam Dryers March 20, 2008

Steam Dryer Analyses AH-ft

  • Unit 1 Analysis

- Submitted March 6, 2008

- Includes:

o Unit 1 specific strain gage data o Latest bias and uncertainty o FEM corrections o Noise reduction

- Results Location Node SR-P SR-a Freq. Shift (%)

.1 opCoerInerHo"~r co Oerta17pro,Perf.P ,ate ~ fý88059-. 30

2. Top Cover/Tie Bar Base 107054 3.47 1.59 10
3. Top Cover/Tie Bar Base 102407 3.29 1.62 2.5
4. Top Cover Middle Hood/Top Perf. Plate/Top Cover Overlap 91420 3.05 1.63 10
5. Top Cover/Tie Bar Base 96561 3.96 1.94 10
6. Top Perf/Top Cover/Dam Plate 103088 4.31 1.98 7.5
7. Submerged Drain Channel/Skirt 104539 2.57 2.15 10
8. Dam Plate/Lock 102521 4.76 2.19 7.5
9. Top Cover Inner Hood/Hood Support/Tie Bar Base 103094 4 2.28 10
10. Top Perf/Top Cover/Dam Plate 103089 5.14 2.4 5 2

Steam Dryer Analyses Unit 2 Analysis

- Scheduled to be submitted March 31, 2008

- Will include:

o Latest bias and uncertainty o FEM corrections

" Noise reduction 3

Steam Dryer Analyses Unit 3 Analysis

- Scheduled to be submitted June 2008

- Will include:

o Unit 3 specific strain gage data o Latest bias and uncertainty o FEM corrections o Noise reduction

- Outage status o Outage began March 18 o Acoustic vibration suppressors will be installed 0Strain gage data will be obtained following restart 4

Steam Dryer Analyses Potential for SRV Resonance

- Frequency range 105 Hz to 112 Hz most likely

- No demonstrated SRV resonance at CLTP velocities from plant data

- 1/5 Scale testing of A & B main steam lines o Testing shows SRV frequency onset starting at CLTP and small increase at EPU Mach numbers

- 1/8 Scale testing for EPU prediction o In progress

" Used to determine need for mitigation modifications 5

RAI Status

  • Group 1 -January 31,2008

- Generic questions, plans to use unit-specific data, clarifications

  • Group 2 - March 6, 2008

- Unit 1 stress analysis, damping

  • Group 3- March 31, 2008

-Unit 2 stress analysis, misc.

  • Group 4 -June 15, 2008

- Unit 3 stress analysis 6

Steam Dryer Monitoring Plan

" Draft provided for discussion

  • Includes

- Test plateaus at 5%

- Power increments of 2.5%

- Performance criteria based on limit curves

- Proposed license conditions 7

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