ML020520687
| ML020520687 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 01/17/2002 |
| From: | NRC/NRR/DLPM |
| To: | |
| Assa R,NRR/DLPM,415-1391 | |
| References | |
| TAC MB3839 | |
| Download: ML020520687 (35) | |
Text
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Presentation to USNRC Refuel 13 Plans for RC S Hot-L eg Nozzles V. C. Summer Nuclear Station January 17, 2002
Meeting Objective
"*Refuel 12
- Commitments -Inspect B/C Hot Legs
- WCAP 15615, Integrity Evaluation
- Safety Evaluation Report
"*Refuel 13
- Inspect to Demonstrate Continued Integrity
- Apply Stress Improvement to Mitigate
"*Be Proactive
- Expectations
- Communications
Meeting Overview
- Existing Condition-Gary Moffatt
- Inspection Techniques-Terry McAlister
- Mitigation Techniques-Gary Moffatt
- Summary/Discussion mIwIff I
SCA vc Summer RF 12 Relevant Indications A LOOP HOT LEG - New weld w/IAlloy 690 material A, B, & C COLD LEGS- WCAP 15615 > 25 years HOT LEG LOOP LOCATION/ LENGTH ORIENTATION (EDDY CURRENT)
C 309/CIRC 0.5 B 35/CIRC 0.6 B 200.8/AXIAL 0.25 B 348/AXIAL 0.25
Automated UT/ECT Exam Plans for the V.C. Summer R.V.
Nozzle to Pipe Examinations, Spring 2002
RF-12 And Post RF- 12 Experience
"* Both Demonstrations Witnessed by Station, ANII and NRC Representatives
"° ET was Used (For First Time in USA) to Complement UT in Screening for Surface and Near Surface Indications
"* ET Has Been Extensively Used for Screening Purposes in RPV Head Penetration Exam with Positive Results
RF- 13 Hot Leg NDE Strategy
- UT Using Wesdyne Enhanced Process
- Satisfy Post RF-12 Commitments
- Demonstrate Integrity of Welds
- To Provide Basis for Performance of MSIP
- ET Using Wesdyne Enhanced Process
- Compliment UT Exam
- Screening for Indications for Further Investigation
- Address Post RF-12 Communications
"7' A CA'A Examination Strategy Edd Current Exams Ultrasonic Exams Evaluate data and measure I criteria Apply screening any relevant indications. Correlate ECT with UT and I evaluate inconsistencies, if Perform ASME Section XI present.
assessment of recorded indications.
Further investigate any indication exceeding MSIP acceptance criteria.
Present results to Utility MSIP Team
A 6CANA C'MPANY Ultrasonic Examinations Technique Improvements
- Transducer Optimization and Size Reduction (30 x 30mm reduced to 22x22mm Probe Size)
"* Improvements in the Transducer Sled
( Floating Probes Within a Frame )
"* Addition of C-scan Analysis Display (Depth Gate Developed Plan View) ioVI;i; 1
- A UT Transducer Size Reduction i
Fri Shown: V.C Summer ECT Indication 1 in actual surface geometry. Lack of contact for 30x30mm Probe and probable contact scenario for 22x22mm probe
4SANACONIFANY V . C. Summer A Nozzle data - Through-Wall Crack, 70 degree L Data, 2.0 MHz Inconel weld/buttering seen in sweeps 5-8 i.0 MHz Probe should improve imaging
A SCANA COMPANY Vc 309 V.C. Summer 2002 Examinations - Bore Sled I
4
11 INA Ultrasonic C-Scan display for Paragon Analysis Software Depicted: Developed plan view of 360 degree scan with artificial circ oriented defects 5
- SCEd*&G, Ultrasonic Technique Plan for Probe Use / Acquisition
- 70' 1.0 MHz 4 directionally Dual element construction - ( 7.6 x 14.2mm x2)
Incremental distance. 125"circ., .125" Axial
° Conservative 57% overlap of one element
- ASME Code calibration / characterization 9 0.08 to .1 Inter Pulse Period Other techniques available if needed 6 0).
S A4 CRt ¶C'-
A O;M hNA Eddy Current Technique Plan for Probe Use/Acquisition Two Probes, Plus Point normal orientation and Plus Point Off-axis orientation for detection of flaws in all possible orientations.
Identical to 2000 examination configuration
"* Increment size -.125"
"* Operating frequency - 100, 250 and 500 KHz for each probe
- Data IPP ( distance between pulses, scan direction) = 0.025
>I/
0.025"
.125" 7 t."pi 'I
A S%
Mechanical Stress Improvement Process (MSIP)
1=164 M&C. .0,.
Mechanical Stress Improvement Process - MSIP MSIP
"* Invented, developed, and first used in 1986
"* Displacement controlled - verifiable by measuring pipe hoop contraction oPermanently removes weld residual tensile stresses and generates compressive residual stresses
° Mitigates stress related cracking in nuclear reactor plant piping weldments
A SCANA COMPANY MSIP PRINCIPLE (a)AS WELDED (b) AFTER MSIP Removal of Tension Provides Permanent Protection of Weldments Against Stress Related Cracking 2
SCANA COPIIIPANY BASIC CONCEPT OF MSIP TOOL
- a. Application of Pressure to CL,
,b O..Z Contract Pipe T O.D. I'D*
APPLIED PRESSURE
- b. Schematic of Permanent b.
Deformation after MSIP
- c. Mechanism of Compression ZONE Generation in Axial and Hoop Directions
- Deformation in pictures are exaggerated for viewing purposes 3
MSIP APPLICATION TO NOZZLE/SAFE END WELD INBWR PLANT k ]
Vt-:
41
ASMMMWM2---_
REDISTRIBUTION OF STRESS IN 28" WELDMENT APdat Hoop Before MSIP After MSIP Before MSIP After MSIP 20ksi
-- 10ksi 20ksi
- -- 20ksi
- Weldment ID 00 ID OD ID OD ID 00 5
Argonne National Laboratory 12" and 28" Straight-To-Straight Tests "MSIPTREATED 12" AND 28" WELDMENTS EXAMINED TO:
DETERMINE RESIDUAL STRESS STATE PRODUCED BY MSIP COMPARE MEASUREMENTS WITH FINITE ELEMENT ANALYSIS INVESTIGATE POSSIBILITY OF ANY UNDESIRABLE SIDE EFFECTS
"* RESIDUAL STRESSES MEASURED ON INNER SURFACE AND THROUGHWALLS:
INNER SURFACE AXIAL AND HOOP STRESSES HIGHLY COMPRESSIVE
(-30 KSI TO -50 KSI IN HAZ FOR 12" AND
-22 KSI TO -50 KSI IN HAZ FOR 28")
THROUGHWALL AXIAL RESIDUAL STRESS DISTRIBUTIONS ALMOST LINEAR ACROSS THICKNESS 0 COMPRESSIVE STRESSES IN HAZ PERSIST THROUGH 50% OF PIPE WALL MEASUREMENTS COMPARE FAVORABLY WITH ANALYTICAL RESULTS AND ARE, IN FACT, BETTER NO UNDESIRABLE SIDE EFFECTS
MSIP Experience
- Used Since 1986 on Over 1300 Welds Including more than 500 Nozzle and Safe-End Welds in Over 30 BWR Units Worldwide 0 Applied to Welds Without and With Stress Corrosion Cracks 0 No Indications Found in Treated Welds 0 Pre-existing Cracks Arrested; No Crack Growth after MSIP During Subsequent Fuel Cycles
- Verified by Argonne National Laboratory and EPRI for Pipe Specimens and Nozzle Specimens Without and With Cracks 9 NRC Acceptance NUREG-0313
A SIANA COM'PANY MSIP FOR BWR vs. PWR
- Similar Materials
- Nozzle SA508 CIil1
- Weld 82/182
- Safe-end SST
"* Similar Configuration
- Nozzle to Safe-end / Pipe Welds
"° Similar Geometry
- Comparable D/t
"*Analysis shows similar Post-MSIP results
"° Application
- Similar Tooling
- Similar Procedures
- Same Verification Parameters S"!oI - -
9
A CYA COMPANY EPRI BWR RECIRCULATION SYSTEM NOZZLE (N2), FN2-1-1, FN2-1-3 1.121 3-15088,0 1.87
.137
.887 11.50 DIA 13.56 DIA 9.90 DIA It.OD DIA 14.00 OIA 10-- ----- --- -- --- -- -
10t
H-. I
> u
-LI
- .."~ ?i1
/ N*
N .W... .N
--.-- 4 ' i*
- w I I-,oC U
V SrCAEAe Qrv V.C.Summer Process Qualification EPRI BWR NOZZLE TO SAFE-END V.C. SUMMER NOZZLE TO SAFE-ENDIPIPE Nominal OD = 14" Average OD = 33.93" Nominal ID = 11.6" Average Wall Thickness t = 2.42" Mean Dia. DM = 12.8" Mean Dia. DM = 31.51" Wall Thicknesst = 1.2" DM= 12.8 = 10.67 DM = 31.51 = 13.02 t 1.2 t 2.42 The BWR Safe-end DM is less than V.C. Summer.
t Therefore, VC Summer is bounded by the existing applications.
A SCANA LOMPANY V. C. SUMMER HOT LEG NOZZLE WELD REGION AN DEC 28 2001 11:17:12 PLOT NO. I ELEMENTS PowerGraphics EFACET:1 MAT NUM V C Surmaer RPV Hot Leg Nozzle Assembly 13
A SCANA COMPANY V. C. SUMMER HOT LEG NOZZLE AS-WELDED RESIDUAL STRESS (AXIAL)
SJ DEC 28 2001 11:20:58 PLOT NO. 3 NODAL SOLUTION STEP=2 SUB =6 TIME=2 SY (AVG)
RSYS=0 PowerOraphics EFACET-I AVRES=AII DMX = .009322 SMN =-34307 SMUX -56039
-34307
-24268
-14230
-4192 5847 15885 25924 35962 46000 No 56039 V C Sununer RPV Hot Leg Assembly As-Welded Stresses 14
A SCANA 0GOFANY V. C. SUMMER HOT LEG NOZZLE AS-WELDED RESIDUAL STRESS (HOOP)
J DEC 28 2001 11:21:34 PLOT NO. 4 NODAL SOLUTION STEP=2 SUB =6 Tfl4E:2 SZ (AVG)
RSYS=O PowerGraphics EFACET=
AVRES=All DMX =.009322 SNvN =-32227 SSMX :64541
-32227
-21475
-10723 28.645
- 10781 21533 32285 43037 53789 64541 IV C S.unuer RPV Hot Leg Assembly As-We.lded Stresses 15-
A SCANA O0PVy V. C. SUMMER HOT LEG NOZZLE WELD POST- MSIP RESIDUAL STRESS (AXIAL)
AN DEC 28 2001 12:34:52 PLOT NO. 1 NODAL SOLUTION STEP=9 SUB -4 TIME:9 SY (AVG)
RSYS:0 PowerGraphics EFACET=1 AVRES=All MX :.251796 SMN =-46788 SmX =42978 46788
-36814 S-26840 IKE -16866
-6892
A SCANA (,OMP3ANY V. C. SUMMER HOT LEG NOZZLE WELD POST- MSIP RESIDUAL STRESS (HOOP)
J'N DEC 28 2001 12:35:19 PLOT NO. 2 NODAL SOLUTION STEP=9 SUB =4 Tfl4E=9 Sz (AVG)
RPSYS=O PowerGraphics EFACET=
AVRES=AI1 DAX -=.251796 SN*A=-52831 SlY =36508
-52831 S&D-42904
= -32978 ff--1 -23051 fm -13124 6729
-3198 16655
MSIP Conclusions
"*MSIP at V. C. Summer is Bounded by Existing Qualification Testing
- Similar Materials
- Similar Configuration / Geometry
- Comparable D/t
"*MSIP FEA for V. C. Summer
- Axial compressive stresses - 50% wall
- Hoop compressive stresses - 50% wall
"*NUREG 0313 - 0.3t Acceptance Criteria
"*Operating experience on over 500 nozzle and safe-end welds
- MSIP has been demonstrated to be effective in mitigating SCC
A AA.'P, VC Summer RF 13 Repair Contingencies e Localized ID Repair MSIP
Summary
"* Demonstrate Continued Integrity Through Inspection
"° Apply Mitigating Process
- Proven To Be Effective
- Qualification Applies To VC Summer
- Accomplished Via 10CFR50.59
"* Inspection/Evaluation Results Provided To NRC To Support SER Revision