ML061360368
| ML061360368 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 05/11/2006 |
| From: | Arizona Public Service Co |
| To: | Plant Licensing Branch III-2 |
| Shared Package | |
| ML061360116 | List: |
| References | |
| Download: ML061360368 (114) | |
Text
Palo Verde Nuclear Generating Station Unit 1 Shutdown Cooling Suction Line Elevated Vibration C;; /
A Presentation on the Physical Modification of PVNGS Unit 1 SDC Suction Line to Eliminate High-Level Vibration May 11, 2006
Introductions
- Carl Churchman - Director of Engineering, APS
- Mo Karbassian - Design Engineering Manager, APS
- Craig Seaman - General Manager, Regulatory Affairs -
+ Bob Yamrus - Bechtel Power Corporation
- Robert Blevins, PhD. - Consultant
- M. K. Au-Yang, PhD. - Consultant
- Frank Ferraraccio - Westinghouse Electric
- Winston Borrero - Sr. Consulting Engineer, APS
Presentation Overview Introductions and meeting objectives -
Carl Churchman Technical discussions - Jeff Brown
- Configuration
- Unit 1 vibration history
- Phenomenological
- Modifications
- Final modification selection and development Modification process - Mo Karbassian Open discussion August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Presentation Objectives (continued)
- Communicate to NRC sensitive PVNGS issue
- Present Unit 1 SDC suction line vibration issue and final modification design
- Present Unit 1 restart criteria
- Discuss modification process and licensing considerations
Configuration I V//
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Configuration C Plant North UV-652 RCP lB r RCP 2A RCP IA RCP 2B Pressurizer UV-651 August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Configuration
.: 7 "; fa ) ID
.DI I AL . ( . .
a/
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Configuration "O'ix August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Configuration
REFERENCES:
DWG. 78473-771-006, General Arrangement APS DWG. 78473-728-002, Nozzle Cladding and Machining DWG. 78473-761-001, Material Identification DWG. 01-P-SIF-105, Containment Building Isometric SI and SDC Lines (Sheet I of 2)
BOP ALL BENDS ARIE 24 INCH RADIUS 31'-11 7/8' S 33'-11 7/8' P,0/
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Configuration t -
I t~
I.W, - ""If 5,;
p 4, ,
k 41#li,
,t '-
ED: .. ! . ¢u~
X~
r I A. I ,
_. I A: A:
I', - 4 Augus .i
Configuration
- Condition
- Unit 1, train 'A' vibration amplitude as high as 2.0 IPS at 24.5 Hz
- Units 2 and 3, train 'A' vibration amplitude approximately 0.2 - 0.3 IPS at 24.0 Hz
- Units 1, 2, and 3 train '1B' has no appreciable vibration
- small peaks at approximately 27 Hz.
Note that 2.0 IPS at 24.5 Hz ~ 13 mils (0-P) and 0.8g August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Configuration COMPLEX EIGENVALUE = 0 OOOOOOE+00. 1.377998E+02
^;SPPyPEoil Size i >
Type sJŽJ Revert (32) 0.0031 m (31) 0,0030 m (30) 0 0029
- . (29) 0 0028 (28) 0.0027 (27) 0.0026
= (26) 0 0025 (25) 0 0024 124) 0.0023 r (23) 0,0022 (22) 0.0021 (21) 0,0020 (20) 0.0019 (19) 0.0018 (18) 0 0017 (17) 0,0016 (16) 0,0015 (15) 0 0014 m (14) 0.0013 (13) 0,0012
(:S
- 12) 0.0011 (11) 0.00099 (10) 0.00089 (9) 0.00079 (8)0.00070
'(7) 0.00060 (6)0.00050 (5)0.00040 (4) 0 00030 a 1, ~
(3)0.00020 (2)0.000099 (1)0 0 August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Unit 1 Vibration History August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification 34
Unit 1 Vibration History U1 C9 (March, 2001) - vibration identified
- Monitoring data indicates vibration since beginning of U1C9
- No vibration prior to Ul C9
- Possible change during U1 R8 - CSB 10 year ISI U1 R9 Engineering action plan
- Inspection of all susceptible welds
- Vibration and temperature monitoring program
- Inspection of 1JSIAUVO651 valve and actuator
- Periodic on-line inspections of SDC suction line during U1C10 August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Unit 1 Vibration History
- u1c1o
- Continuous breaker to breaker run (May, 01 - September, 02)
- Vibration levels trended upward from 1.0 to 1.2 IPS at 24.8 Hz during final 3 months
- No indication of degradation during on-line inspections August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Unit 1 Vibration History
- U1 R1 0 (October, 2002)
- SDC suction isolation valve 1JSIAUVO651 fails to open
- Root cause evaluation determined failure due to insufficient actuator fastener tightening during U1 R9 reassembly
- High-level vibration
- Revised Engineering action plan
- All butt and socket welds re-inspected
- Branch line socket weld build-up
- Actuator hardened - internal fasteners secured with "Loctite"
- Inspection ports installed in actuator housing - enhanced inspection program during Ui C11
- Pipe support modification installed to reduce structural resonance with acoustic forcing function August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Unit 1 Vibration History
- ulcil
- Significant increase in vibration amplitude with increasing power
. Power ascension stopped at 70% RTP - 1.90 IPS at 24 Hz
- Plant shutdown and new pipe support removed - vibration levels reduced to approximately EOC U1C10
- Amplitude increased to 1.40 IPS following March 2003 short-notice outage
- Pin hole leak found in fitting socket weld on branch drain line during preparation for T-Mod in Feb. 2004
- Root cause of failure analysis determined that fatigue failure was the result of pipe support not in compliance with design
- Failure accelerated by high-level vibration AugustA5,Q;in line recopfigumW K w W9ig, wv,
Unit 1 Vibration History
+tJ1 R1 1 (March, 2004)
- Performed ISI of all butt and socket welds
- Performed additional weld build-up for all attached small bore pipe
- Implemented an enhanced monitoring program
- Inspected core support barrel (CSB) position
- Installed temporary installation of heat trace along SDC suction line
- Refurbished and inspected actuator
- Installed "heat tracing" on SDC suction line
+ 1J1C12
- Vibration levels -1.60 IPS t
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification 3641664v
Unit 1 Vibration History U1 R1 2 (October, 2005 - SGR)
- Installed "vortex plate"
- Design validation testing demonstrated increase in air entrainment
- Vortex plate removed prior to start-up
- Inspected all butt and socket welds
- Refurbished and inspected actuator U1C13
- Testing identified potential for vibration levels beyond design limit - Unit 1 shut down
. LER draft in progress
- Testing completed under exigent licensing amendment August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification &,~
Phenomenological August 15, 2005
-Nml I--
awl PVNGS Unit 1 SDC Suction Line Modification
Phenomenological
- Hypothesis The direct cause of the Unit 1 vibration condition is the development of pressure pulsations in the suction line resulting from coupling between the fundamental (one-quarter wave length) acoustic frequency of the SDC suction line and the shear layer instability (vortex shedding) due to RCS flow over the SDC suction nozzle
- "Coke bottle" analogy August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Phenomenological
- Supporting Facts
- Unit 1 vibration amplitude proportional to RCS flow rate
- Correlated to RCS temperature (density) - Proportional change in amplitude with changes in RCS temperature
- Demonstrated during phenomenological testing
- Vibration frequency proportional to SDC suction line temperature
- Unit 1 SDC line temperature and vibration different that Units 2 and 3
- Vibration amplitude dependent on frequency August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification I_
Phenomenological U1 LOOP 1 HOT LEG - 42"ID AVERAGE NORMAL OPERATING TEMPERATURES BY UNIT 3 (6110F) 5.5ft "I .T/C 1 (1200F) T/C 651 EXISTING INSULATION 7 FT
-T/C 2 I 34.5 ft I
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification a, s;i.1
Phenomenological Unit 1 SDC Suction Line Temperature and Vibration Frequency 700 ____ __Feb. 19- Mar. 3, 2004 25.0 T-HOT 24.9 600 T/C 5 __
TIC 4 24.8 500 24.7 a0M a24.6 a e 400 a N Heating Pads De-energized 0 24.5 300 24.4 I 200 1 ____T/C _ 24.3 24.2 100 ___ __ _
Heating Pads Energiz 2 0 24.0 2/24/04 2/25/04 2/26/04 2/27/04 2/28/04 2/29/04 3/1/04 3/2/04 3/3/04 Date
Phenomenological Unit 1 SDC Suction Line Temperature and Vibration Amplitude Feb. 19- Mar. 3, 2004 2
_ _ _ _ _ _ _ _ _ _ T-HOT 1.8 600 TIC 5 TIC 416 500 -1.4 1.2 400 a_ I_ - X Ca)
E 300 E 0.8~
_ _ __ _ _ T/C _ _ __ _ __ _ __ _ _ 0.6 200 Or_ _ 06 00.4 100 _0.2 2/24/04 2/25/04 2/26/04 2/27/04 2/28/04 2/29/04 3/1/04 3/2/04 3/3/04 Date
Phenomenological 5500 ClD L 5000 w 4500 cc 4000 z
0 w 3500 w
a_
CO3000 a
z 2500 D
0 CD) 2000 0 100 200 300 400 500 600 700 TEMPERATURE, F
, Al lu sl'T-li-.
awry s . TV_M-
, ECU:] rv
- auriFTT-.I ou-."Tr mrzlr-r-rn-W7r rl _ _."
Phenomenological Unit 1 SDC Suction Line Temperature and Vibration Frequency MTC Testing, Oct. 23 - 27, 2003 700 25.00 650 24.90 600 24.80 550 24.70 500 24.60 N w
L.4
- 450 24.50 C 0.
E 0*
4) 400 24.40 XL 350 24.30 300 24.20 250 24.10 200 l -_ 24.00 10/24/03 10/24/03 10/25/03 10/25/03 10/26/03 10/26/03 10/27/03 10/27/03 10/28/03 Date
Phenomenological Unit 1 SDC Suction Line Temperature and Vibration Amplitude MTC Testing, Oct. 23 - 27, 2003 70U _ I U I I I 2
650 l l I 1.8 8
________~ -+ I* .'A -.-- - ~
600 a_ -'lI - a rgj! 13
_ 1.6 0%,
550 - - I 1.4 620 1.8
-- -- --- -- - -- I *A.. - . --
500 - 618 vVWOW*W,-"
rI Ad -1 1.2
- - -T-- W_ vwM 6)
I-616 11P 1.75 a) 4-(U E.0 614 N A 0.
E 450 L.I 612 I\I, \ / P, 1.7 0) 10 1 .E_
a) L.. i
'i /I S 400 0. 610 f- 1.65
-- 0.8 E
0) 608 11 I 0 /I E
- d k i i s 606 II 1.6 350 0.6 604 I -
a 1.55 602 300 - 0.4 600 -I 1.5 9 :36 10:48 12:00 13:12 14::24 250 -_ 0.2 Date T -- - -
200 I 0 10/24/03 10/24/03 10/25/03 10/25/03 10/26/03 10/26/03 10/27/03 10/27/03 10/.II'8/03 Date
Phenomenolog ical Unit 1 SDC Suction Line Vibration March 17 - 18, 2006 (SNOW) 700.0 - 2.00 1.80 600.0 --
-HOT-
- 1.60 500.0 1.40
_-2A1 -
in 1.20 a.
G 400.0
_T C-3A1 X 1.00
- TC4A2 LE g
C) 300.0 - C6A1 _
0.80 N
200.0 0.60 1-k
-> 0.40 100.0 I 0.20 SI S2 0.0 I I 0.00 3/17/06 12:00 3/17/06 18:00 3/18/06 0:00 3/18/06 6:00 3/18/06 12:00 3/18/06 18:00 3/19/06 0:0 August 15, 2005 PVNGS Unit 1 SDC TLon Line Modification N. II
Phenomenological Unit 1 SDC Suction Line Pressure and Vibration Measurements April 6, 2006 10 -10 1 1 0.1 0.1 00 a)oo -I-Ool 0.001 ,.001 0.0001 0.0001 0.00001 0.00001 10 15 20 25 30 35 40 August 15, 2005 PVNGS Unit Rr(a8cVtih.ine Modification
Phenomenological
- Research programs
- ASU Phase I - vortex shedding characterization and turbulence penetration depth parametric assessment
- ASU Phase 11 - scaled acoustic coupling experimentation and quantification of modification effects August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Phenomenological ASU - Phase I August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification Final W
iMMMUM-
Phenomenological ASU - Phase I
,, P August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification "I
Phenomenological ASU - Phase I Penetration Depth Correlation 6
0 0
6.5 1
e 04 c 5 15% Swirl -AT 3.0 C *0*
0 IL 45 0 S U
cr 15% Swirl - AT = 25.4 C ** U 1 4 No Swirl - AT = 3.5C_ _
0 zz0 No Swirl - AT-27.5 C 3.5 3
30 35 40 45 50 55 60 65 70 75 August 15, 2005 PVNGS Unit 1'SD'S I'fMt~'todification ;y-
Phenomenological ASU - Phase 11 1"
-N August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification JWI
Phenomenological ASU Phase 11 1.20E-05 _
Model Pressure Amplification at Resonance 2.OOE-08 05161610-BLI -044-32 U = 14.32 fWs fM=8.0Hz 1.80E-08 T = 93.00 F 1.OOE-05 PD = 0.001 49 PSI 1.60E-08 1.40E-08 8.00E-06 1.20E-08 N
Xn 6.OOE-06 1.OOE-08 Fn 0
co U, a- CL 8.00E-09 4.OOE-06
-6.OOE-09 4.OOE-09 2.OOE-06 2.OOE-09 O.OOE+00 i O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Phenomenological ASU Phase 11 1.20E-05 Model Pressure Amplification at Resonance - 2.OOE-08 05200830-BLI -040-32 U = 15.75 fWS fM = 8.9 Hz 1.80E-08 T = 82.7°F 1.OOE-05 PD = 0.001 84 PSI 1.60E-08 1.40E-08 8.OOE-06 1.20E-08 9! 6.OOE-06 1.OOE-08 Xn 0.
co 8.OOE-09 4.OOE-06 6.OOE-09 4.00E-09 2.OOE-06 2.OOE-09 O.OOE+00 - O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Phenomenological ASU Phase 11 1.20E-05 Model Pressure Amplification at Resonance 2.00E-08 05200940-BLI -038-32 U = 16.58 fWs fM = 9.4 Hz 1.80E-08 T = 85.8° F 1.OOE-05 PD = 0.00204 PSI 1.60E-08 1.40E-08 8.OOE-06 1.20E-08
- s m
"n 6.OOE-06 1.OOE-08 X?
0~ 0 On C,)
0L 8.OOE-09 4.OOE-06 6.OOE-09 4.OOE-09 2.OOE-06 2.OOE-09 w
O.OOE+00 O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Phenomenological ASU Phase 11 1.20E-05 Model Pressure Amplification at Resonance - 2.OOE-08 05201300-BLI -034-32 U = 18.53 fWS fm = 10.5 Hz 1.80E-08 T = 92.40 F PD = 0.00252 PSI 1.OOE-05 1.60E-08 1.40E-08 8.OOE-06 1.20E-08 N
XO6.OOE-06 1.OOE-08 XO 0
0- (n 0.
8.OOE-09 4.OOE-06 6.OOE-09 4.OOE-09 2.OOE-06 2.OOE-09 O.OOE+00 _ O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification dxNO
Phenomenological ASU Phase 11 1.20E-05 Model Pressure Amplification at Resonance - 2.OOE-08 05231722-BL1 -031-32 U = 20.32 fWS fM = 11.5 Hz 1.80E-08 T = 89.90 F 1.OOE-05 PD = 0.00299 PSI 1.60E-08 1.40E-08 8.OOE-06 1.20E-08 X? 6.OOE-06 1.OOE-08 gO 0
~L 0
0- 0-8.00E-09 4.OOE-06 6.OOE-09 4.OOE-09 2.OOE-06 2.OOE-09 O.OOE+00 O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification flitI
Phenomenological ASU Phase 11 1.20E-05 Model Pressure Amplification at Resonance 2.OOE-08 05110945-BL1 -030-32-1 U = 21.00 Wt/s fM= 11.8 Hz 1.80E-08 T= N/R 1.OOE-05 Po = 0.00329 PSI (est) 1.60E-08 1.40E-08 8.00E-06 1.20E-08 I
Q-. 6.OOE-06 1.OOE-08 X_
0 co Uc C-a-
8.OOE-09 4.OOE-06 6.OOE-09 4.OOE-09 2.OOE-06 2.OOE-09 O.OOE+O0 O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Phenomenological ASU Phase 11 1.20E-05 Model Pressure Amplification at Resonance
_ 2.OOE-08 05111155-BLI-029-32-1 U = 21.72 fs fm = 12.2 Hz 1.80E-08 T=81.40 F 1.00E-05 PC = 0.00354 PSI 1.60E-08 1.40E-08 8.OOE-06 1.20E-08 Phi N
~n- 6.OOE-06 1.OOE-08 u0 0
U) 0 a- U) a.
8.OOE-09 4.OOE-OE 6.OOE-09 4.OOE-09 2.OOE-OE c],
2.OOE-09 O.OOE+OC - .OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Phenomenological ASU Phase 11 1.20E Model Pressure Amplification at Resonance - 2.OOE-08 05111310-BLi -028-32-1 U = 22.50 fts fM= 12.7 Hz 1.80E-08 T = 82.60 F 1.OOE-05 Po = 0.00378 PSI 1.60E-08 1.40E-08 8.00E-06 1.20E-08 XV6.OOE-06 1.OOE-08 X?
Cl C a- 0 CL 8.00E-09 4.OOE-06 6.00E-09 4.00E-09 2.OOE-06 2.00E-09 O.OOE+00 2 O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
Phenomenological ASU Phase 11 1.20E-05 Model Pressure Amplification at Resonance - 2.OOE-08 05231925-BLI -026-32 U = 24.23 Ws fM = 13.7 Hz 1.80E-08 T = 93.00 F 1.OOE-05 PD = 0.00432 PSI 1.60E-08 1.40E-08 8.00E-06 1.20E-08 R,
N X5 6.OOE-06 1.OOE-08 X.?
c:;
0 at U) 8.OOE-09 4.OOE-06 6.OOE-09 4.OOE-09 2.OOE-06 2.OOE-09 O.OOE+00 O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Phenomenological ASU Phase 11 1.20E-O!
Model Pressure Amplification at Resonance
- 2.OOE-08 05232034-BL13-024-32 U = 26.25 WS fM = 14.8 Hz 1.80E-08 T = 89.90 F 1.ooE-o! PD= 0.00502 PSI 1.60E-08 1.40E-08 8.OOE-O(
1.20E-08
.Z
'? 6.OOE-OE 1.OOE-08 9_
U, C/)
8.OOE-09 4.OOE-O(
6.00E-09 4.OOE-09 2.OOE-Oe 2.OOE-09 O.OOE+OC O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification 311'6L
Phenomenological ASU - Phase 11 Normalized Model Acoustic Amplification 1.20E+00 R a 1.OOE+OO 0 0 0
0 U..
8.OOE-01 B M 0
1C,, 0 a- 6.OOE-01 0
&) M CI 4.OOE-01 1 0
M 2.OOE-01 -
- 0
- OBaseline ilI la Baseline II l O.OOE+00 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 St = fd/U August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification ivk
Modifications am N, Kw, '12- -
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification R.Wjlffimmwda-Nr
Modification Development and Selection
- Consultant and EPRI expert panel recommendations
- Approach predicated on flow-induced vibration hypothesis
- Modifications designed to de-couple acoustic process
- Shift shedding frequency
- Shift acoustic frequency
- Modification of nozzle geometry is typical approach
- Unable to quantify affects and approach requires re-cladding of nozzle and or hot-leg Modifications to affect structural resonance not cognst Augusidered 15,2005PVNGS Unit 1 SDC Suction Line Modification Ui
Modification Development and Selection
- Modifications to affect shedding and acoustic frequency evaluated by scaled model testing
- One-quarter scale model of hot-leg and SDC suction nozzle
- Tests performed in air with Mach number similarity
- Testing objective is to baseline SDC suction line acoustic pressure force and to qualitatively assess effects of various modifications on the acoustic pressure
- 11 variations of nozzle modification tested
Modification Mock-Up Testing
- F"II MIJ i
7f@77;S:
v,11~4.
I A>
4 a,~
'4 ":,
"..,, hi.
A-a1a August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification i? :
Vortex Plate Modification Reduction in Acoustic Pressure with Vortex Plate Model 1.20E-05 1.OOE-05 8.OOE-06 K? 6.OOE-06 C,,
4.OOE-06 2.OOE-06 Modification 10 f~~~~~-Baselineein O.OOE+00 23 23.5 24 24.5 25 25.5 26 26.5 27 Frequency (Hz)
'14A i /
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification slmft Ad
Vortex Plate Modification
- U1 R1 2 final modification - grid plate August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification iA :,~iI
Vortex Plate Modification
- U1 R1 2 restart - vortex plate validation testing
- Testing demonstrated significant increases in surface vortexing and air entrainment
- Mid-loop operational impacts
Vortex Plate Modification August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Final Modification -
Isolation Valve Relocation August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Final Modification - Isolation Valve Relocation
- Modification proposed by consultants and EPRI expert panel
- Arizona State University testing demonstrated significant reduction in pressure amplitude
- Valve relocation towards RCS to increase acoustic frequency away from shedding modes and pipe modes August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Final Modification - Isolation Valve Relocation Model Suction Pressure Amplification with Relocated Valve 1.20E-05 1.OOE-05 8.OOE-06 6.OOE-06 Q-?u 4.OOE-06 2.OOE-06
- Baseline
-Modification 11 O.OOE+00 19 20 21 22 23 24 25 26 27 Frequency (Hz) t/
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Final Modification - Isolation Valve Relocation I
tn i
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Final Modification - Isolation Valve Relocation
+ New location at 11 feet from RCS nozzle
- Higher acoustic frequency (61 Hz)
- No significant coupling with vortex shedding modes
+ No evidence of other significant excitation sources
- Location consistent with some Korean System 80 plants
Modification Activities August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification rl b'-""SOL
-I rw
Modification Activities SI-V651 Modification Details
- Status
- Design Considerations Core Support Barrel Inspection August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification I
Status Palo Verde 1 De-Fueled/PCV 118 Closed RCS Empty Modification Scaffolding Commodity Relocation Support Installation SDC Piping Cut In Progress August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification A _,
s;el
Existing Valve Location
Proposed Valve New Location I
II August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification E.IammmmmiM-T*r
Design Details Physical Changes
- Add One Missile Shield
- Add One Pipe Whip Restraint
- Add Several Pipe Supports
- Conduit Relocation
Design Detail Critical Design Basis Analysis/Evaluations
- Equipment Qualification (EQ)
- Jet Impingement Evaluation
- Missile Evaluation
- ASME Class I Piping Analysis
- Hydraulic Evaluation of Both Piping
- MOV Pressure Locking/Thermal Binding
- Safety Analysis (Boron Dilution)
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Design Detail- EQ Environmental Considerations w Normal Plant Condition
- Thermal Effects ( Process and RCS Temperature)
- Radiation Effects (Additional Exposure Due to RCS Components (N-I 6 and Neutrons)
- Post Accident Condition
- Pressure and Temperature (PIT) Effects
- Radiation Effects
- Seismic Qualifications August 15, 2005 N~
,A PVNGS Unit 1 SDC Suction Line Modification
Design Detail- EQ PVNGS Licensing Criteria:
^ Regulatory Guide 1.89 Revision 1, June 1984
EQ: Normal Environment Temperature Evaluation
- CFX ANSYS is Used for the Valve/Operator Modeling
- Steady State Temperature of All Critical Components is Calculated
- Electrical Cable Routing is Selected to Stay Within IEEE Code Requirement
- Result
- Increase in Temperature is Within the Design of the Component
- Replacement Interval for The MOV Operator Non-Metallic Sub-components is Increased
- MOV Operator Will Be Instrumented for Temperature Monitoring August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
EQ: Normal Environment Radiation Evaluation
- Neutron Contribution at New Location is Negligible
- The MOV/Operator is Located Outside of Possible Streaming Area
- Result
- Increase in Normal Radiation Is Within the Design of the Component
EQ : Post Accident Environment
- Pressure/Temperature Evaluation
- Licensing Criteria
- NUREG 588 and Reg. Guide 1.89, Rev. 1
- Selection of Limiting Postulated Breaks
- Based on the Function of SI-V 651
- Postulated Breaks Include Secondary Lines (3-6" IDs) and Feed Water Lines
- Only SBLOCA Is Considered
- MSLB Not Considered, Piping Outside of Compartment August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
EQ: Post Accident Environment
+ PIT Evaluation Results
- Existing Containment EQ Profile for MSLB and LOCA Remains Bounding August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
EQ : Post Accident Environment Radiation Evaluation Criteria:
- Licensing Basis:
- NUREG 588 and Reg. Guide 1.89, Rev. 1
- Source Term -
- 100% NG, 50% iodine and 1% solid.
Instantaneous / Homogenous Release
- Iodine Removal/Plate out
- Credit Is Taken for Spray and Iodine Removal Within the Sprayed Compartment
- Plate-Out Contribution Is Conservatively Calculated Based on Maximum Iodine Loading per NUREG / CR 0009 August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
EQ : Post Accident Environment Radiation Evaluation
Conclusion:
- Total Integrated Exposure + LOCA (180 Day)
Remains Within the Existing Tested Exposure August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification et
Jet Impingement/Missile Evaluation
- A New Pipe Whip Restraint Will Be Installed at the Pressurizer Spray Line Terminal End to Protect the MOV
- No Other Effects From Other Postulated Jets or Missiles August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
j
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ASME Class 1 Piping Analysis Bechtel Computer Code ME-1 01, C1 Used for the analysis Evaluated both the SDC and Hot Leg Injection Piping Calculated Stresses and Usage Factors Continue to Meet Code Allowable August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Hydraulic Evaluations
+ The Following Changes were Considered
- Increased Hot Leg Injection (SI) Piping Length
- Valve Location Change
+ Result m Minimal Effect on Hydraulic losses
- Documentation of Impact on Analysis in Progress.
August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification .
- Pressure Locking
- Criteria
- Bonnet Pressurized Cold, Then Heated Up
- Analysis Results
- Pressure Relief Valve Is Installed on SI-651 Bonnet
. Limits Bonnet Pressure
- Capacity of the Installed Relief Valve is Verified August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Thermal Binding
+ Criteria
- Occurs When Valve is Closed Hot and Then Cools Down
- Temperature Difference Has to be 200 Degrees Or Greater
- Result
- Thermal Binding is Prevented Because Temperature Limits Remain Protected by Current Operating Procedures August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Safety Analysis Consideration
- Criteria
- Analyze for Consequences of an Inadvertent Boron Dilution Event
- Result
- 651 Valve Open (SDC)
- No Effect on the Boron Dilution Analysis
- Piping Length is Not Changed
- 651 Valve Closed
- No Effect on the Boron Dilution Analysis
- SDC Piping Is Not Credited as Part of the RCS Volume August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
NRC Approval/Relief Request
+ 50.59 Screening and Evaluation is in Process
+ NRC Approval is not Anticipated Because
- No Technical Specification Change is Identified
- The Change Satisfies Applicable Design Basis Requirements as Outlined Previously (EQ, Seismic, Missile, Jet Impingement, etc.)
- Equipment Continues to Perform Its Intended Design Function
- No Changes to Elements of Methodology Identified or Used During Evaluations
+ NRC Code Relief Request is not Anticipated Because
- Existing Approved Welding Processes Are Used
- No Change in Post Weld Heat Treatment Requirement Is Identified August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification
Core Support Barrel Inspection Two Part Inspection Initial Inspection While the CSB is Inside the Reactor Detailed CSB Inspection in CSB Stand Detailed Inspection Criteria Is Developed Detailed Inspection Will take Place After Valve Re-location August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification i &,ALI,_,
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Open Discussion August 15, 2005 PVNGS Unit 1 SDC Suction Line Modification 4-,