ML082050462: Difference between revisions
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{{#Wiki_filter:TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Extended Power Uprate Steam Dryers July 18, 2008 Non-Proprietary Version IM | {{#Wiki_filter:TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Extended Power Uprate Steam Dryers July 18, 2008 | ||
Non-Proprietary Version Agenda IM | |||
* Mitigation | |||
* Stress Margin Improvement | * Stress Margin Improvement | ||
* Noise Removal | |||
" Hydrodynamic Damping | |||
* Unit 3 | |||
* Schedule 2 | |||
Non-Proprietary Version Mitigation Two sources of potential acoustic resonance | |||
- 218 Hz from blank standpipes in flow stream | |||
- 109 Hz from SRVs in flow stream Modifications are planned to mitigate resonances | |||
- -Acoustic Vibration Suppressors (AVS) for blank standpipes | |||
- Acoustic Side Branches (ASB) for SRVs will follow pV 2 Dryer loading during power ascension 3 | |||
Non-Proprietary Version Mitigation - AVS I | |||
* Acoustic Vibration Suppressors | |||
- Address 218 Hz associated with blind flange standpipes in flow stream | |||
- Unit 3 strain gage data show elimination of resonance | |||
- Unit 3 accelerometer data show elimination of resonance 4 | |||
Non-Proprietary Version Mitigation - AVS Im CLTP Strain Gage Plant Data Browns Fenyr: MSL A Upper (Channel 1) Browns Fenyr: MSL A Lower (Channel 5) 1 I | |||
-- --------- . . . . | |||
]. --.--. . . . . u . .. . . . | |||
0.1 N 0.1 . ------------- | |||
.- | |||
=* | |||
0.01 0.01 e, | |||
0.00 1 0.001 0.0001 0.0001 . .. . .. . . -- - -- - - _ - - - -- - - | |||
N | |||
-= 50 100 150 200 10-5 0 so 100 150 200 250 Frequency (Hz) Frequency (Hz) | |||
°, 10 Browns Ferry: MSL A Upper (Channel 4) Browns Ferry: MSL A Lower (Channel 8) 0.1 ---- ---------- 0.1 N* | |||
0.01 ....... | |||
Revision as of 14:44, 14 November 2019
| ML082050462 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/18/2008 |
| From: | Tennessee Valley Authority |
| To: | Division of Operating Reactor Licensing |
| Brown Eva, NRR/DORL, 415-2315 | |
| Shared Package | |
| ML082050419 | List: |
| References | |
| TAC MD5262, TAC MD5263 | |
| Download: ML082050462 (49) | |
Text
{{#Wiki_filter:TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT Extended Power Uprate Steam Dryers July 18, 2008
Non-Proprietary Version Agenda IM
- Mitigation
- Stress Margin Improvement
- Noise Removal
" Hydrodynamic Damping
- Unit 3
- Schedule 2
Non-Proprietary Version Mitigation Two sources of potential acoustic resonance
- 218 Hz from blank standpipes in flow stream - 109 Hz from SRVs in flow stream Modifications are planned to mitigate resonances - -Acoustic Vibration Suppressors (AVS) for blank standpipes - Acoustic Side Branches (ASB) for SRVs will follow pV 2 Dryer loading during power ascension 3
Non-Proprietary Version Mitigation - AVS I
- Acoustic Vibration Suppressors
- Address 218 Hz associated with blind flange standpipes in flow stream - Unit 3 strain gage data show elimination of resonance - Unit 3 accelerometer data show elimination of resonance 4
Non-Proprietary Version Mitigation - AVS Im CLTP Strain Gage Plant Data Browns Fenyr: MSL A Upper (Channel 1) Browns Fenyr: MSL A Lower (Channel 5) 1 I
-- --------- . . . .
]. --.--. . . . . u . .. . . .
0.1 N 0.1 . -------------
.-
=*
0.01 0.01 e, 0.00 1 0.001 0.0001 0.0001 . .. . .. . . -- - -- - - _ - - - -- - - N -= 50 100 150 200 10-5 0 so 100 150 200 250 Frequency (Hz) Frequency (Hz) °, 10 Browns Ferry: MSL A Upper (Channel 4) Browns Ferry: MSL A Lower (Channel 8) 0.1 ---- ---------- 0.1 N* 0.01 .................................
..................... ......... 0.01 N----
------------
=* -.
.....
0.001 ------------- --------
--------------- ---------------------------------------- 0.001 C-.
-----------------
0.0001 10-s
----------------
--------------------
--------------- -- - ------------------ 0.0001 i0-5 0 50 100 150 200 250 0 50 100 150 200 250 Frequency (Hz) Frequency (Hz) 5
Non-Proprietary Version Mitigation - AVS Im CLTP Strain Gage Plant Data Browns Ferry: MSL B Lower (Channel 13) Browns Ferry: MSL B Lower (Channel 15) 1 - T I I I I I I I I I II I I I I I I I ,r 0.1 0.1 N
.... . -.. -----------------
----------------- ---- -----...- . ..
-- --------.. ---------- ---------- .........
.. . . . . . ...............
. . .... ... .. .
0.01 0.01
---- ~~- -- - --
--N- ---
C-0.001 . i-. . . . . -- . . . . --i BF.. 3.. .. V') 0.00 1 C') 0.0001 0.0001 10-5 10-5 0 k-50 100 150 200 0 50 100 150 200 250 250 Frequency (Hz) Frequency (Hz) Browns Fenry: MSL B Lower (Channel 14) Browns Ferry: MSL B Lower (Channel 16) 1 1 0.1 ---
------ -- -----. 0.1 N __B FN3 Cl 0.01
-o 0.01 CL
-n 0.001 0.00 1 0 ------- -- -- - --- - -- - - -- -- --- -- - -- - - -- -
-- -- I- -- -- -- -- -- -- -- -
C') - -- - -- --- -- -- -I------ --- -- 0.0001 0.0001 10-5 10-5 0 50 100 150 200 250 0 50 100 150 200 250 Frequency (Hz) Frequency (Hz) 6
Non-Proprietary Version Mitigation - AVS Im I CLTP Strain Gage Plant Data Browns Ferry: MSL C Lower (Chamlel 24) 1
-- - - - - - - - . -- - - - - - - -. I 0.1 N
i i -- -----i 0.01 0.001
------------------------------------------------.-
0.000 1 10.5 0 50 100 150 200 m 50 Frequency (Hz) Browns Fenyr: MSL D Lower (Channel 30) 1 0,I N 0.1 -. . . . -. . . . . . . . . . . . -, C-r 0.01
. .-. .--. -. - . - .-
. . . -- - ---. - -- - - . .. . . . .
0.001 0.0001
. . . . . . . . . . . . . . . .
.. . .... . .
I0-5 0 50 100 150 200 2:50 Frequency (Hz) 7
Non-Proprietary Version Mitigation - AVS Unit 3 CLTP Accelerometer Plant Data 3-PCV 1-4 Y Vibration Trend Comparison (Before and After AVS) 10Before AVS After AVS 0.5 0 40
.4 . . . . . . . . . . . . . . . . . . . . . . . - -. . -. . - . -..-
. -. -. . - . -. . - "'- . .- . .- .-
- - -. -- -.. -
0 .35 .. . . . . . . . . . . .. . . . . . . .. . . .. . . .. . . .. . . . .. . . .. . . . . .. . . . 0.35... S0.25 -------------------------- -------- --------- --------- --------- --------- S0.2 -- - - -L- L- - - - t-- I - - --- - -- - - -------------- 0.1 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 Steam Flow (mlblhr) 8
Non-Proprietary Version Mitigation - AVS IM Unit 3 CLTP Accelerometer Plant Data PCV 1-4Y Spectrum Before (Blue) and After (Red) AVS for MSL A Flow = 3.4 mlb/hr 0.2 0.15 0 0.1 0.05 0 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 Hertz 9
Non-Proprietary Version Mitigation - ASB Acoustic Side Branches
- All 9 SRVs in flow stream
- Installation to preclude SRV resonance at increased power levels 0 - 109 Hz o Onset at 102% CLTP o Peak at 195% CLTP o Determined by 1/5 SMT
- ASB same as QC o 24" long - 100.5 Hz first mode o Eliminates SRV resonance o No additional frequencies created
- 1/8 SMT for Unit 2 was performed to demonstrate ASB effectiveness
- SRV frequency eliminated - no new frequency created o BFN 1/8 scale test results
" QC in plant results 10
Non-Proprietary Version Mitigation - ASB Im 1/8 SMT Results at CLTP BFN2: CLTP, MSL D Upper 0.01 'N 0.001 0Z 0.0001 Nq 10.5 '- I 106 7 10-0 50 100 150 200 250 Frequency (Hz) 11
Non-Proprietary Version Mitigation - ASB Im 1/8 SMVT Results at EPU BFN2: EPU, MSL D Upper 0.01 N 0.001 0.0001 N 10-5 zI 10.6 7 10. 0 50 100 150 200 250 Frequency (Hz) 12
Non-Proprietary Version Mitigation - ASB N 1/8 SMT Results at SRV Resonance Frequency BFN2 BFN2 3 10.5 3 10s N 2.5 10. 5 - _.- A Upper: without ASBs .. . " N 2.5 10s . IS B Upper: without ASBs
- A Upper: with ASBs S B Upper: with ASBs 2 10 .5 2 10
---
-- - -- - -- - -- - -- -
1.5 10 .5 1.5 105 - -- -- -- -- - -- --
----
N N 0.08--
---- - 0.09--
---- - 0.1--0.11----
1 10 .5 1 10 "S
---
-- - -- - -- - -- - -- -
0* --- ------- ----
-- - -
---- - ......... 06 z 5 10° °- -- -
5 10.6 , ,s,-dP; , . iIS.
-- - - - - - - - - - _
- 0. 0 -- - - -- - - -
0 ..... _ - - - - - - - -----------...... 0 . , .
. . . .
0 Illlllllllllllllllllllll 0.09 0.1 0 0.09 0.1 0.11 0.1." 0.0 7 0.08 0.11 0.12 0.0 7 0.08 LN Mach Number Mach Number = BFN2 BFN2 3 10 .5 3 10s S N
. A Lower: without ASBs ----........... B Lower: without ASBs ........................-..... .
2.5 10.5 ---
--- - 2.5 10-5 S
- A Lower: with ASBs S B Lower: with ASBs N* 2 10' 2 10.5
--
--- --
1.5 10s5 1.5 10.5
--
- --- -
N Cu 1 10 .5 1 10s 0 510
- k. -- - -- - 0 5 10.6
*: us : S E0 S* t
*, .o i . im l . .
0 U-0.0 7 0.08 0.09 Mach Number 0.1 0.11 0.12 0.07 0.0)8 0.09 0.1 0.11 0.12 Mach Number Mach Numbers: 0.087 (CLTP) & 0.1 (EPU) SRVs in MSL flow stream: A=3, B=2, C=1, D=3 13
Non-Proprietary Version Mitigation - ASB Im 1/8 SMT Results at SRV Resonance Frequency BFN') BFN2 3 10-5 BFN2 3 10-5 Nt N 2.5 10-5 *
- C Upper: without ASBs C Upper: with ASBs 2.5 10 5 " DUpper: without ASBs .....................-
- D Upper: with ASBs -
--- --- -- --.--. -- --.- -- -- t -- . .- .--. -. -- . .- .- ---- . .----
. . --- . -...
. .----- .. .. . . .
2105 - 2 105 6 0 5 1.5 10 - 1.5 10.
--------------------- -----------------*.........,............ ------- -------_------.
N 1 10-5 0 see: 1 10 .5 o-.......-
----..
-.---- -............. ...... ........ ............
,, '. O 40 S 0@0
-
5 10 0 5 10.6 --- - --- - - -- - - - --- - - -- - - - --- - - - 0.9 01 m z 0 0 0.09 0.1 0.07 0.08 0.09 0.1 0.11 0.12 0.0 7 0.08 0.11 0.12 Mach Number Mach Number BFN2 BFN2 3 105 3 10-5 NI N 2.5 10-5
- C Lower: without ASBs ----............................. - 2.5 10'
- D Lower: without ASBs ----------------
- C Lower:with ASBs - '- D lower: with ASBs 5
2 10. ...............- ................ - - -... -.. - - - - --.... - ---
------ 2 10-5
-o 1.5 10-5 1.5 10s
- 0) .. -------------- - -
......... ..... N 1 10- ------- ------ ---- -- ------- ---- --- 1 10-5
-----.---.. .. .-.. AI . . . . .
--- --- --- --- --- --------- ..-- --. -.--- .-- . -.--- . .. . .. ..--..
. ---------
. --
5 106 5 106 z --
, 1, .. . . i , , :
0 n 0.07 0.08 0.09 0.1 0.11 0.12 0.07 0.08 0.09 0.1 0.11 0.12 Mach Number Mach Number Mach Numbers: 0.087 (CLTP) & 0.1 (EPU) SRVs in MSL flow stream: A=3, B=2, C=1, D=3 14
Non-Proprietary Version Mitigation - ASB Quad Cities Experience 02RI8 kcelerorneter Trends Target Rock Inlet Flange - X 04 0-35 0.3 0-25 o 0-2 o 0.15 0.1 0.05 0 0 500 1000 1500 2000 2500 3000 Core Thermal Power, MWt 15
Non-Proprietary Version Mitigation - ASB Im Quad Cities Experience Quad Cities Unit 2 Strain Gage Spectra Main Steam Une "A Upper Location 2 500E-01 2.OOOE-01 2 & 1.500E-01 C.
*1MOOE-O1 51000E-02 O.OOOE+O0 0 20 40 60 80 100 120 140 160 180 200 Frequency, Hz 16
Non-Proprietary Version Stress Margin Improvement IM
- Presented margin discussion during April 17 meeting Common understanding of margin expectation o SR-a > 2.0 at EPU; SR-a > 2.7 at CLTP for BFN
- Review of limiting locations (SR-a < 2.7) - Grouped locations by "families" o Tie bar; steam dam; hood support; drain channels - Dryer modifications - Sub-structure models 17
Non-Proprietary Version Stress Margin Improvement " Mitigation of potential acoustic resonances
- AVSs &ASBs
- Dryer modifications identified
- Tie bar families - Steam dam families
- Sub-structure modeling incorporated
- Hood support families - Drain channel families Stress margin improved to > 2.7 at CLTP conditions - Unit 1 SR-a = 2.91 - Unit 2 SR-a = 2.81 18
Non-Proprietary Version Stress Margin Improvement JRAJ Unit 1 Limiting Locations at CLTP Location Node SR-P SR-a % Freq Shift
- 1. Submerged Drain Channel/Skirt 98860 3.1 2.91 7.5
- 2. Remaining tie bar (outer hood)/tie bar base 132385 4.47 3.23 0
- 3. Mid Bottom Perf. Plate Exit/Mid Top Perf. Plate Exit/Tie Bar 106852 6.89 3.24 7.5
- 4. Outer Hood/Hood Mod/Mod Base/Channel Cap 111407 7 3.29 7.5
- 5. Top Cover Middle Hood/Outer Closure Plate/Middle Hood 90897 2.41 3.34 10
- 6. Submerged Drain Channel/Skirt 98156 4.24 3.34 10
- 7. Middle Cover Plate/Hood Support/Inner Hood 104843 2.55 3.44 7.5 19
Non-Proprietary Version Stress Margin Improvement iM Unit 1 Limiting Locations SR-a (weld) 4.9 47 4.5 4,3 4.1 3.9 3,7 3.5 3.3 3.1 2.9 20
Non-Proprietary Version Stress Margin Improvement Unit 1 Limiting Locations 21
Non-Proprietary Version Stress Margin Improvement Unit 1 Limiting Locations jZ SR-a (weld) 4.9 4.7 4.5 4.3 4.1 3.9 3.7 3.5 3.3 3.1 2.9 22
Non-Proprietary Version Stress Margin Improvement IM Unit 2 Limiting Locations Location Node SR-P SR-a % Freq Shift
- 1. Outer Side PanelNane Bank ThinNane Bank Thick/Outer End 102701 5.27 2.81 7.5 Wall - with ASBs installed
- 2. Outer End Wall Ext/Outer End Wall - with ASBs installed 103411 5.48 3.02 7.5
- 3. Middle Cover Plate/Hood Support/Middle Hood 97294 4.04 2.82 5
- 4. Dam Plate/New Gusset 101769 6.14 2.83 2.5
- 5. Outer Hood/Outer End Wall 103405 5.47 2.84 7.5
- 6. Outer Hood/Gusset Pad Thin/Top Cover Outer Hood 108730 2.58 2.89- -5
- 7. Top Cover Middle Hood/Outer Closure Plate/Middle Hood 97204 3.17 2.92 10
- 8. Submerged Drain Channel/Skirt 110570 2.53 2.95 10
- 9. Outer Hood/Top Cover Outer Hood 108710 6.44 2.95 -5
- 10. Top Cover Middle Hood/Middle Hood/Shell Tie Bar 107158 3.05 2.96 -5
- 11. Submerged Drain Channel/Skirt 104115 5.2 3 10 23
Non-Proprietary Version Stress Margin Improvement Unit 2 Limiting Locations z SR-rn (weld) 4 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1
-3 2.9 2.8 2.7 2.6 2.5 24
Non-Proprietary Version Stress Margin Improvement Unit 2 Limiting Locations SR-a (weld) 9 4 3,9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 25
Non-Proprietary Version Stress Margin Improvement Unit 2 Limiting Locations x SR-a (weld) 4 3.9 3.8 3.7 3.8 3.5 3.4 3.3 3.2 3.1 3 2.9 2.81 2.7 2.6 2.5 26
Non-Proprietary Version Stress Margin Improvement [ju Dryer Modifications " New tie bar designs
- Steam dam gussets with pads
- Reinforcement of the outer hood cover (Unit 2 only) 27
Non-Proprietary Version Stress Margin Improvement JRAJ Dryer Modifications Unit 2 Flared & tapered tie bar Units I & 2 Flared & tapered with hood lock outer vane bank tie bar discharge 4ý1 28
Non-Proprietary Version Stress Margin Improvement RW Dryer Modifications Unit 1 Steam dam gussets Unit 2 Steam dam gussets and reinforcement of the outer hood cover Steam Darn Steam Darn Vane Bank Cover-
*"*'* Existing End Gussets.
29
Non-Proprietary Version Stress Margin Improvement Sub-Structure Modeling
- Sub-Structure modeling applied to more accurately capture local geometry and weld configuration Applied To:
- Drain channel to skirt joint at bottom of channel - Middle cover plate/hood support/inner hood joint 30
Non-Proprietary Version Stress Margin Improvement Sub-Structure Modeling
- 4-Step Process
- 1. Develop a shell sub-model with appropriate boundary conditions to recreate the stresses from the CDI model
- 2. Develop a much more detailed solid model with the same boundary conditions to more accurately represent joint configurations and stress variations
- 3. Use the results of the solid model analysis to linearize stresses along various paths through the welds
- 4. Determine the stress correction factor between the shell model and the solid model 31
Non-Proprietary Version Stress Margin Improvement Sub-Structure Modeling
- Linearization process produces stresses consistent with the ASME Code approach for calculation of membrane (Prn) &
membrane + bending (Pm + Pb) stresses
- The CDI results are modified by the stress correction factors between the shell model and the solid model
- 0.58 for the drain channel to skirt joint - 0.79 for the middle cover plate/hood support/inner hood joint
- 1.8 weld factor is retained 32
Non-Proprietary Version Stress Margin Improvement im Sub-Structure Modeling - Stiffener Shell model Solid model 1..J3 218. ! 71*.1.3-t F~rry 'St~ri = o ,* 33
Non-Proprietary Version Stress Margin Improvement Sub-Structure Modeling - Drain Channel Shell model Solid model 34
Non-Proprietary Version Stress Margin Improvement IRAI Sub-Structure Modeling - Drain Channel Stress Paths MN 6 3,- P12 w\ 2,- 1 7 7 8 7 35
Non-Proprietary Version Noise Removal Significant signal magnitude at zero or low flow
- Translates into fictitious dryer load Noise floor data taken at low steam flow .- Unit 1 data at 9% - Unit 2 data at 19% - Small steam flow needed for pressure regulation - Unit 2 data lowest available Average noise at each frequency subtracted - Limited to 3dB (factor of 2) signal reduction P(f) = Po(f)*max 0.51 -* -f-*
36
Non-Proprietary Version Noise Removal im
- Low flow noise floor represents non-flow signal component
- Noise = component of measurement not related to flow - Po+P 1 Q+P 2 Q2 - Noise floor bounds Po term MSL A Lower, 61.502 Hz 180 160 ............
CL 0 Data 140 - Quadrati E C 120
.mL_
100 0 0 80 0* 0) U-60 ------------ ------ 2 n3 W) M)
- 0) 40 a_
-------
20
-20 0 20 40 60 80 100 120 Power [ %]
37
Non-Proprietary Version Noise Removal IM PSD Comparisons BFN1: MSL AUpper 0.1 N 0.01 0.001 0.0001 10-5 0 50 100 150 200 250 Frequency (Hz) 38
Non-Proprietary Version Noise Removal PSD Comparisons BFN2: MSL A Upper 0 .1 , , , , , , , , , 0.01 - _ CLTP N 19% Power 0.001 0.0001 10-6 0 50 100 150 200 250 Frequency (Hz) 39
Non-Proprietary Version Noise Removal IM Unit 1 Monopole - MSL A 0.001 0.0001 N 10i Iý CO 0L 10-i0o 7' S0-8 0 50 100 150 200 250 Frequency [ Hz ] 40
Non-Proprietary Version Noise Removal M Unit 1 Dipole - MSL A 0.01 0.001 0.0001 N o 0-5 Iý w.' CL 10-10o7 10-0 10 20 30 40 50 60 70 Frequency [ Hz ] 41
Non-Proprietary Version Noise Removal Unit 1 Quadr 3tic Fit MSL A Lower, 61.502 Hz MSL B Upper, 12.732 Hz 180 - T - I 703 0 0 160 (D 600 CL - oDataR j Datal 0 140 Qudai F! - artcFit Q E 40( C 120 "a 400 0 100 CS 00 A 0 80 0
. . . . . . . !. . . . .... . . / LL 20 T) 60 U) 0L 40 0 20 . _ I__ 2 0 20 i 4 _ 0 s
-20 0 20 40 60 80 100 120 -20 0 20 40 60 80 100 120 Power [%]" Power [%]
MSL B Lower, 107 Hz 120 T 1 00 100 - L Data 0 80 - O: 60 k 0O U. 40 - 0. 20
-20 0 20 40 60 80 100 120 Power [%]
42
Non-Proprietary Version Noise Removal Unit 1 Quadratic Fit MSL C Upper, 167.40 Hz MSL D Upper, 46.549 Hz 55 ------- T 160 01 140 k 50 - 0 Data Quadratic Filt C0 I- oDataQuadati FIR E E 120 k-C
- 0. 45 0 0o
- 0 100 k 0
0 80 - 40 V 8 0 LL 60 F 35 - 0 En En 40 1 I I 30 20
-20 0 20 40 60 80 100 120 -20 0 20 40 60 80 100 120 Power [%1 Power [%]
MSL C Lower, 34.351 Hz MSL D Lower at 226.1 Hz 500 T _ __ -I 100 I ~ _T 0 0 400 F 0 Data QuadraticFt -0; 'a (. 80 k S.....I.. C 0
- 0) 300 k 0 60 k - 0u dai 0i . . . . 0...
. . . . . . .
8 4J) 200 - CS 0 40 F _0 00 0 LL Li-T 10oo U. 20 - Mn En 0 0
-20 0 20 40 60 80 100 120 -20 0 20 40 60 80 100 120 Power [%] Power [%]
43
Non-Proprietary Version Noise Removal 11VA1 Unit 1 Limiting Nodes Noise Removal Location Node SR-a SR-a (Noise (Noise Removed) Retained)
- 1. Submerged Drain Channel/Skirt 98860 2.91 2.29
- 2. Remaining tie bar (outer hood)/tie bar base 132385 3.23 2.06
- 3. Mid Bottom Perf. Plate Exit/Mid Top Perf. Plate Exit/Tie Bar 106852 3.24 2.53
- 4. Outer Hood/Hood Mod/Mod Base/Channel Cap 111407 3.29 2.74
- 5. Top Cover Middle Hood/Outer Closure Plate/Middle Hood 90897 3.34 2.50
- 6. Submerged Drain Channel/Skirt 98156 3.34 2.69
- 7. Middle Cover Plate/Hood Support/Inner Hood 104843 3.44 2.54 44
Non-Proprietary Version [[ 45 45
Non-Proprietary Version II 46
Non-Proprietary Version Unit 3 Original plan to perform Unit 3 stress analysis at CLTP in June 08
- Installed 64 main steam line strain gages during Spring refueling outage - All but 10 strain gages failed during primary system heatup - Remaining operable strain gages are not sufficient to perform stress analysis on Unit 3
- Repair of strain gages at next planned outage of sufficient duration
- May be Spring 2010 EPU outage - Preparations being made for earlier opportunity 47
Non-Proprietary Version Unit 3 TVA seeking approval of all three Units for EPU prior to completing Unit 3 stress analysis ° Unit 1 and 2 analysis experience provides confidence that Unit 3 analysis will be successful
- Unit 2 and Unit 3 steam dryers are of same design - Units 1, 2, and 3 steam systems are similar - Available Unit 3 strain gage data indicates load will be similar to Unit 1 o 10 locations on Unit 3 compared with Unit 1 o No new peaks identified o Spectrum and magnitude of signals comparable to Unit 1
- License Condition to take data and perform stress analysis
- Same methods and assumptions as Units 1 and 2 - NRC approval prior to exceeding CLTP 48
Non-Proprietary Version Schedule IM Item Date NRC issue RAI-18 (AREVA Fuels) 7/21/2008 NRC issue RAI on Steam Dryers 7/2008 TVA response to RAI on Steam Dryers 8/2008 TVA response to RAI-1 8 (AREVA Fuels) 9/16/2008 ACRS Subcommittee meeting 11/19-20/2008 ACRS meeting 12/4-6/2008 NRC issue EPU Amendment for Units 1, 2, and 3 1/2009 Unit 1 implement EPU 1/2009 Unit 2 implement EPU Spring 2009 Unit 3 Spring 2010
- Repair strain gages
" Take CLTP MSL data " Perform stress analysis " NRC approval of stress analysis
- Implement EPU 49}}