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 Nozzles V. C. Summer Nuclear Station January 17, 2002 eg
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
Summer RF 12 Relevant Indications A LOOP HOT LEG - New weld w/IAlloy 690 material A, B, & C COLD LEGS-HOT LEG LOOP WCAP 15615 LOCATION/
> 25 years LENGTH ORIENTATION 3 09/CIRC 35/CIRC 200.8/AXIAL 348/AXIAL 0.25 vc SCA C
B B
B (EDDY CURRENT) 0.5 0.6 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 Ultrasonic Exams Evaluate data and measure any relevant indications.
I Perform ASME Section XI assessment of recorded Edd Current Exams Apply screening criteria I
Correlate ECT with UT and evaluate inconsistencies, if present.
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) 1
- ioVI;i;
UT Transducer i
Size Reduction 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 A
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
Vc 309 V.C. Summer 2002 Examinations - Bore Sled A SCANA COMPANY 4
I
Ultrasonic C-Scan display for Paragon Analysis Software Depicted: Developed plan view of 360 degree scan with artificial circ oriented defects 5
11 INA
Ultrasonic Technique Plan for Probe Use /
- SCEd*&G, 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 hNA O;M 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/
.125" 0.025" 7
t."pi 'I
A S%
Mechanical Stress Improvement Process (MSIP)
1=164 M&C.
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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
BASIC CONCEPT OF MSIP
- a. Application of Pressure to Contract Pipe
- b. Schematic of Permanent Deformation after MSIP
- c. Mechanism of Compression Generation in Axial and Hoop Directions
- Deformation in pictures are exaggerated for viewing purposes CL, b.
O..Z
,b TOOL T O.D.
I'D*
APPLIED PRESSURE ZONE 3
SCANA COPIIIPANY
MSIP APPLICATION TO NOZZLE/SAFE END WELD IN BWR PLANT Vt-:
k
]
41
ASMMMWM2---_
REDISTRIBUTION OF STRESS IN 28" WELDMENT APdat Before MSIP
-- 10ksi
- -- 20ksi ID 00 After MSIP ID OD Hoop Before MSIP 20ksi
- Weldment ID OD After MSIP ID 00 20ksi 5
Argonne National Laboratory 12" and 28" Straight-To-Straight Tests "MSIP TREATED 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
- Weld
- Safe-end SA508 CIil1 82/182 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 1 0--
10t
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V SrCAEA e Qrv V.C.Summer Process Qualification EPRI BWR NOZZLE TO SAFE-END Nominal OD
= 14" Nominal ID
= 11.6" Mean Dia. DM
= 12.8" Wall Thicknesst = 1.2" DM t
= 12.8 = 10.67 1.2 V.C. SUMMER NOZZLE TO SAFE-ENDIPIPE Average OD
= 33.93" Average Wall Thickness t = 2.42" Mean Dia. DM
= 31.51" DM = 31.51 = 13.02 t
2.42 The BWR Safe-end DM is less than V. C. Summer.
t Therefore, VC Summer is bounded by the existing applications.
V. C. SUMMER HOT LEG NOZZLE WELD REGION AN V C Surmaer RPV Hot Leg Nozzle Assembly DEC 28 2001 11:17:12 PLOT NO.
I ELEMENTS PowerGraphics EFACET:1 MAT NUM 13 A SCANA LOMPANY
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
IV C S.unuer RPV Hot Leg Assembly As-We.lded Stresses 15-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
A SCANA O0PVy V. C. SUMMER HOT LEG NOZZLE WELD POST-MSIP RESIDUAL STRESS (AXIAL)
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 3082 13056 23030 33004 42978 VC Summer RPV HL Nozzle Assembly Post MSIP Stresses 16 AN
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
-3198 6729 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
- Localized Repair From OD
- MSIP 0 Spool Piece Replacement J
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