ML20090A917
| ML20090A917 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 01/31/1992 |
| From: | Connor W, Demuth R GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML20090A904 | List: |
| References | |
| TR-084, TR-084-R01, TR-84, TR-84-R1, NUDOCS 9203030138 | |
| Download: ML20090A917 (14) | |
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OYSTER CREEK CYCLE 13R OUTAGE ICSCO ACTIVITIES r
TR-084 Rey, 1 i
AUTHOR f pg tl,7glq y R. T. Der.*h, Engineer Sr. I APPROVALS D4/ 9h d-o )
W. 'Connor. - Mgt,- Nuc. Che(n. Materials Eng.
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h 9203030138 920226 PDR ADOCK 05000219 P PDR W --N *=7 3m- - - - _ , .- , _ .,..g., , _ , , , , ,
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TR-004 Rtv. 1 Page 2 of 13 ARRIA&EI This report describes the oyster Creek 13R outage inspection, evaluation and repair activities related to the DWR Intergranular Stress Currosion Cracking (IGSCC) issue. We examined 92 butt welds within the scope of the GPU 13R Inspection Plan [3). An addi-tional 40 butt welds were examit.ed as a result of IGSCC detection within the shutdown cooling and Core Spraf Systems. All four of the nuncon*orming weld-ments within the shutdown Cooling syntem and the Core spray system were repaired with full structural weld overimys. Two nonconforming weldments from prior outages within the Recirculation system were dispositioned *use-as-is."
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TR-084 Eov. 1 Page 3 of 13 ;
TABLE OF CONTENTS r
ARTICLE R&p3 1.0 Ir1*.10j8tCtiQg . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1 4 R. Eta 9At . . . . . . . . . . . . . . . . . . . . . . . . . .
- 1.2 Argas . . . . . . . . . . . . . . . ... . . . . . . . . . . . 4 2.0 IOSCC EEANINATION..AND RESULTS . . . . . . . . . . . . . . . . . . 4 ,
2.1 Emanim&M on Methodpi . . . . . . . . . . . . . . . . . . . . 4 ,
2.2 Personnel Ogalific6tions . . . . . . . . . . . . . . . . . 5 2.3 $
SPUM Review . . . . . . . . . . . . . . . . . . . . . . . .
2.4 ggn-contoming Examination Reguli.g . . . . . . . . . . . . $ ,
2.4 1 Shutdown Coolina and_ Core Sorav' System We1Ag . . .- $
2.4.2 Reci.reulation System Welds . . .. . . . . . . . . 5 i 3.0 DIsr0SITION .0F.. WELDNENTS... Cot (IAIMING 101CC_IMD19AI19M1 . . . . . . 5 ;
3.1 $
1RLI9ductica . . . - . . . . . . . . . . . . . . . . . . . . 6 3.2 Wald overlav. Repairs . . .- . . . . . . . . . . . . . . . .
- 3.3 - Use-As-Is . . . - . . . . . . . . . . . . . . . . . . . . . . . 6 4.0 . . . . . . - . . . . . . . . . . . . . . . . . . . . . . 6 BRE535MCJ1 {
6 5.0 I&aLN1 . . . . . . . . -- . . . . . .- . . . . . . . . . . . . . -. . .
Table 1 20 SCC IND!c'ATIONS . . . . . . . . . . . . . . . . 7 Table 2 CIRCUHFERENTIALLY FLAWED OVERLAY REPAIRED WELDS PIPE AND FLAW CEOMETRIC DETAILS . . . . . . . . . 13 1
4 L
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l TR-004 .
Rev. 1 ,
Page 4 of 13 t 1.0 1HTgQPugI1qH .
1.1 bit K H This report describes the 10SC0 augmented inspection program and results of examinations performed during the Cycle 13R outage.
Described are the examination methods, personnel qualifications, extent of examinations and results.
This program to in response to Generic Lottair 88-01(1) and providse assurance that Oyster Creek is not experiencing a major IGSCC problem.
1.2 II9PA The systems examined and their weld categories were 1.n compliance with the GPUN examination plan as depicted in Tables 1 - 14(3).
A total of 92 butt welds were examined within the initial scope.
Am additional 40 butt welds were examined as a result of 10 SCC detection. Of these, four indications were found; one was in the shutdown cooling system and three were in the core spray syst em.
The wald examination expansion criteria applied is provided wit in Section 5.3 of the GPUN Examination Plan [3).
2.O IggILIMMJHATIQN AND MtinTA 2.1 EM!!!iJ1RLiRILMidit9d t Manual and automated UT examination procedures were qualified at -
the EPRI NDE Center. These procedures rely on the 45 degree shear wave examination aa the primary detection technique.
I Geometric considerations of the weld bead width related to base material _ thickness in some cases required the use of manual 60 degree shear wave as a supplemental detection examination. Sizing 1 after verification of IGSCC was performed b/ manual UT. Various EPRI-taught and industry-accepted techniques were utilized. The equipment utilized for the automate $ UT detection examination was the GE-SMART syotem. The ALARA I Scanner (track and arm) with UT Transducer Skewing capabilities allowed accurate location determination by use of X, y and Z coordinates.
The OD and ID clad safe ends were initially examined using the GE-SMART system. Refracted longitudinal waves were used rather than 45' shear waves because of the need to enhance the tip-diffracted and reflection signals f rom flaws extending through the ID cladding 4
' lato the base metal. A corner trap signal could be obscured by the clad interface. The process was qualified on a mockup which duplicated the as-built configuration based on our recordo.
The data acquisition system was the Ultra Image III. The data output from this system was a floppy disc, video cansette recording i of the "A" scan, and computer printout of essential variables I supplemented by hand written calibration and data sheets.
Examination of structural weld overlays was performed using manual '
UT techniques and were demonstrated to be effective in detecti'g IGSCC in the overlay and in the outer 25% of the original pipe wali .
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TR-084 Rev. 1 -
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2.2 tennnatLOltalifiE1112n1 _ _ .
UT was performed by personnel qualified to the NRC/EPR1/DWROG Coordination Plan for Training and Qualification Activities of NDE personnel.
2.3 REL91_AtElmy EPRI-qualified GPUN personnel and GPUN-approved contractors who were also EPRI-qualified performed reviews of all procedures, personnel certifications, data packages, and concurred with all ---
data analysis performed by the Contractor.
2.4 Han-G2D19 M1Dal HplR&l19A_Et E lli 2.4.1 gjmid2wn Coolina and Core Scrav System Welin Four welds contained indications having the UT signal characteristics of IGSCC as follows: one 14-inch diameter shutdown cooling system weld (NU-3-5) and three 8-inch diameter Core Spray System welds (NZ-3-43, -
NZ-3-95).
2.4.2 Egeirculat1Rn fdfliT MaldA Two Recirculation welds (NG-C-9A and NG-D-18) were previously examined in prior outages and dispositioned "use-as-is" based on a ASMF Section XI, IWB-3640 evaluation. The weld examination details are provided in Table 1. Prior outage inspecticn results were provided 1 previously in Topical Report Ob9, Rev. O, submitted by I GPUN letter 5000-89-1833 dated October 30, 1989.
3.0 plBERElI1QN OF WELEMERIS COfffAIELN_0__LQSCC INDlqAllQME .
3.1 inki_91RE.11RD This section describes the actions taken for disposition of the weldments identified by examination as containing the UT signal characteristics of IGSCC. The two actions described are weld overlay repair and analytical evaluation for continued service without repair.
3.2 Eeld overlsv Repplta Shutdown Cooling System Weld Nu-3-5 and Core Spray System Walde NZ-3-43, NZ-3-44 and NZ-3-95 were weld overlay repaired. The overlays were designed assuming that a 360' through-wall crack existed at each location. The resultant minimum design thickness provides adequate margin against plastic collapse when evaluated to the requirements of IWB-3642 of the ASME B&PV Code (1989 Edition)
Section XI. The width of the overlays are sufficient to enable ultrasonic examination of the overlay and outer 25% of the pipe wall in accordarice with the current, aceipted methods. Since the overlays were deposited using the gas t ngsten are method, only primary stresses were included in the design input.
Details of the designs are provided in Table 2, and Reference 4.
The overlays vere deposited using the GTAW process with 309L & 308L bare wire. The original pipe surface and final overlay surface 013/014
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p TR-084 Rev. 1 Page 6 of 13 were liquid penetrant examined. The measurements te confirm minimum design thickness included the first layer that contained an average territe number of 7.5 or higher with no single reading less than 5. Following completion of the overlay welding, each was ultrasonically examined using the current, EPRI-taught, industry-accepted methods as baseline examinations.
3.3 Use-As-11 The indications in Recirculation System Welds NG-D-18 and NG-C-9A were re-eve.luated for continued eervice assuming as-1HS!'d residual stress pattetrns. The results showed that both were acceptable for continued service without repair when evaluated to the criteria of IWB-3640 of ASME Code (1989 Edition)Section XI, Tables IWB-3641-S and 6 and NUREG-0313 Rev. 2 [ 2 ] .
4.0 REI DENCES
- 1. 'NRC Position on IGSCC in BWR Austenitic Stainless Steel Piping (Generic Letter 88-01)," USNRC, January 25, 1988.
- 2. " Technical Peport on Material Selection and Processing Guidelines for BWR Coolant Pressure Boundary Piping', NUREG-0313 Revision 2, W.S. Hazelton, USNRC.
- 3. TR-050, Rev. 3, GPUN Response to Generic Letter 88-01 and NUREG 0313, Rev. 2. February, 1991.
- 4. General Electric Report NE-523-41-0691, Full Structural Wald Overlay Design for the Oyster Creek Shutdown Cooling, and Core Spray system, June 1991.
5.0 TABLrs
- 1. IGSCC fndications
- 2. Weld overlav Design Parametett
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E TR-084 -
Rev. 1 Page 7 of 13 Table 1 I
ICSCC INDICATIONS i SYSTEM PIPE DIA. WELD NO. LOCATION INDICATION DESCRIPTION Recirculation 26.0" NG-C-9A "C" Loop 11R Examination (Elbow to pipe configuration)
DW Elev 12* IGSCC indication #1 started at L-14.8*, is 2.2" long, and is 18% thru wall. The indication is on 3
the elbow side of the weld. (circ.) .
12R Examination IGSCC indication #1 starts at L-14.25*, is 3.5*
long, and is 24% thru wall. The indication is es ;
the elbow side of the weld. (circ.)
13R Examination IGSCC indication #1 starts at L-14.80*, is 3.00*
long, and is 29% thru wall. The indication is on ;
the up stream side of the weld. (Circ.)
! IGSCC indication #2 starts at L-15.80*, is 9.63*
long, and is ICs thru wall. The indication is on the up stream side of the weld. (Axial) i IGSCC indication #3 starts at L-14.00*, is O.49- !
I long, and is 10% thru wall. The indication is on 4
the up stream side of the weld. (Axial)
Recirculation 26.0 NG-D-18 "D* Loop 12R Examination (Pipe to pipe configuration) ;
DW Elev 30' IGSCC indication #1 started at L-55.O*, is 1.2*
long, and is 14% thru wall. The indication is on the up stream side of the weld. (Cire ) '
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IGSCC indication #2 starts at L-78.00*, is 2.2*
long, and is 10s thru wall. The indication is on the up stream side of the weld. (Circ.)
i 13R Exami*iatien .
IGSCC indication #1 starts at L-65.40", is 3.00*
long, and is 17% thru wall. The indication is on ,
the up stream side of the weld. (circ.)
4 IGSCC indication #2 starts at L-78.50", is 0.60* I long and is 13% thru wall. The indication is on the up stream side of the weld. (circ.)
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TR-084 Rev. 1 Page 8 of 13 Table 1 IGSCC INDICATIONS f,
SYSTEM PIPE DIA. .t' ELD WO. LOCATION INDICATION DESCRIPTION ,
Recirculation 26.0 NG-D-18 "D* Loop IGSCC indication #3 starts at L-68.40 , is O.40-DW Elev 30' long, and is 84 thru wall. The indication is on the i
up stream side of the weld. (Axial)
IGSCC indication #4 starts at L-70.OO , is 0.30-j long and is 84 thru wall. The indication is on the i up stream side of the weld. (Axial)
Shut Down 14.0- NU-3-5 DW Elev 40* 13R Examination (Elbow to pipe configuration)
' IGSCC indication #1 starts at L-1.70 , is 5.20-Cooling
- long, and 29% thru wall. The indication is on the up stream side of the weld. (circ.)
]
ICSCC indication #2 starts at L-8.00 , is 1.80*
long, and 46% thru wall. The indication is on the j . up stream side of the weld. (Circ.)
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l IGSCC indication #3 starts at L-3.25 , is 0.50-
) long, and 51% thru wall. The indication is on the up stream side of the weld. (Axial) l IGSCC indication #4 starts at L-8.45 , is O.40-
! long, and 354 thru wall. The indication is on the up stream side of the weld. (Axial)
IGSCC indication #5 starts at L-8.65 , is 0.35-long, and 40% thru wall. The indication is on the up stream side of che weld. (Axial) i IGSCC indication #6 starts at L-9.25 , is 0.35-long, and 404 thru wall. The indication is on the up stream side of the weld. (Axial)
IGSCC indication #7 starts at L-9.75 , is 0.20-I long, and 294 thru vall. The indication is on the up stream side of the weld. (Axial) i 1
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I TR-084 i Rev. 1 Page 9 of 13 Table 1 IGSCC INDICATIONS SYSTEM PIPE DIA. WELD NO. IDCATION INDICATION DESCRIPTION 1 Core Spray 8.O* NZ-3-43 DW Elev 73' 13R Examination (Elbow to pipe configuration)
IGSCC indication ~1 starts at 11.60 , is 0.30- long, and is 224 thru wall. The indication is en the down stream side of the weld. (Axial)
IGSCC indication #2 scarts at 12.90*, is 0.30- long, and is 18% thru wall. The indication is on the down stream side of the weld. (Axial)
IGSCC indication #3 starts at 14.80 , is O.40- long, and is 31% thru wall. The indication is on the down stream side of the weld. (Axial)
IGSCC indication #4 starts at 15.20 , is O.40" long, and is 22% thru wall. The indication is on the down stream side of the , eld. (Axial)
IGSCC indication #5 starts at 16.60 , is 0.30- long, i and is 314 thru wall. The indication is on the down
} stream side of the weld. (Axial) i IGSCC indication #6 starts at 0.20 , is O.48 long,
} and is 40s thru wall. The indication is on the down stream side of the weld. (Axial)
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Core Spray 8.0- ! NI-3-44 DW Elev 73' 13R Examination (Pipe to reducer configuration)
IGSCC indication #1 starts at 0.70 , is 0.80- long,
- and is 194 thru wall. The indication is on the up
! stream side of the weld. (circ.)
IGSCC indication #2 starts at 25.20 , is 2.40 long, and is 42s thru wall. The indication is on the down stream side of the weld. (Circ.)
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TR-084 i Re1r. 1 Page 10 of 13 Table 1 i IGSCC INDICATIONS s
t SYSTEM PIPE DIA. WELD NO. LOCATION INDICATION PESCRIPTION l DW Ele,r 73
- IGSCC indication #3 rtarts at 0.70 , is O.44- long,
. Core Spray 8.0- NZ-3-44 4
(Cont.) and is 57% thru wall. The indication is on the down stream side of the weld. (Axial) i.
IGSCC indication #4 starts at 6.10 , is 0.68* long, and is 54% thru wall. The indication is on the down stream side of the weld. (Axial)
IGSCC indication #5 starts at 7.40 , is O.48- long,
' and is 42% thru wall. The indication is on the down stream side of the weld. (Arial)
IGSCC indication #6 starts -t 8.60", is O.48- long, and is 31% thru wall. The indication is on the down stream side of the weld. (Axial)
IGSCC indication #7 starts at 14.C3 , is O.40- long, and is 31% thru wall. The indication is on the down
! stream side of the weld. (Axial)
IGSCC indication #8 starts at 18.00 , is O.40- long, and is 25% thru wall. The indication is on the down stream side of the weld. (Axial)
,IGSCC indication #9 st'-te at 19.00 , is O.48- long, and is 31% thru wall. .ne indication is on the down stream side of the weld. (Axial)
IGSCC indication #10 starts at 20.50 , is 0.32-long, and is 38% thru wall. The indication is on the down stream side of the weld. (Axial)
IGSCC indication #11 starts at 21.30*, is 0.52-
- long, and is 354 thru wall. The indication is on the down stream side of the weld. (Axial)
IGSCC indication #12 starts at 10.80 , is O.40-long, and is 23% thru wall. The indication is on l
the up stream side of the weld. (Axial) 013/014
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TK-084 4
Rev. 1 Page 11 of 13 i -
Table 1 IGSCC INDICATIONS
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SYSTEM PIPE DIA. WELD NO. I.OCATION INDICATION DESCRIPTION Core Spray 8.0" NI-3-44 DW Elev 73* IGSCC indication #13 starts at 11.90*, is 0.72-i (Cont.) long, and is 34% thru wall. The indication is on the up stream side of the weld. (Axial)
IGSCC indication #14 starts at 12.70*, is 0.20-long, and is 36% thru wall. The indication is on the up stream side of the weld. (Axial)
IGSCC indication #15 starts at 15.20 , is O.40-long, and is 46% thru wall. The indication is on j
the up stream side of the weld. (Axial)
IGSCC indication #16 starts at.16.20 , is O.42-
? long, and is 25% thru wall. The indication is on
) the up stream side of the weld. (Axial)
IGSCC indication #17 starts at 16.90*, is O.40-l long, and is 21% thru wall. The indication is on
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the up stream side of the weld. (Axial)
IGSCC indication #18 starts at 17.30 , is 0.39*
j long, and is 314 thru wall. The indication is on the up stream side of the weld. (Axial)
IGSCC indication #19 starts at 17.30 , is O.41-long, and is 341 thru wall. The indication is on the up stream side of the weld. (Axial) l IGSCC indication #20 starts at 18.20 , is O.40-
} long, and is 21% thru wall. The indication is on
- the up stream side of the weld. (Axial)
IGSCC indication #21 starts at 18.80*, is 0.39-long, and is 29% thru wall. The indication is on the up stream side of the weld. (Axial)
IGSCC indication #22 starts at 19.60 , is O.40-long, and is 404 thru wall. 11w indication is on
,the up stream side of the weld. (Axial) 1 013/014 3
TR-084 Rev. 1 Page 12 of 13 Table 1 ICSCC INDICATIONS 4
SYSTEM PIFE DIA. WELD NO. LOCATION INDICATION DESCRIPTION Core Spray 8.O* NZ-3-95 i DW Elev 73* 13R Examinatio (Pipe to reducer configuration)
IGSCC indication #1 starts at 22.50*, is 1.00* long, and is 21% thru wall. The indication is on the down stream side of the weld. (Circ.)
IGSCC indication #2 starts at 1.55", is 0.32" long, and is 21% thru wall. The indication is on the down stream side of the weld. (Axial)
IGSCC indication #3 starts at 2.85*, is 0.35" long, and is 314 thru wall. The indication is on the down stream side of the weld. (Axial) j' IGSCC indication #4 starts at 25.40 , is 0.30- long, and is 52% thru wall. The indication is on the down stream side of the weld. (Axial) l IGSCC indication #5 starts at 26.50 , is 0.25" long, and is 42% thru wall. The indication is on the down
! stream side of the weld. (Axial) i i
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1 TP-084 Rev. 1 Page 13 of 13 Table 2 CIRCUMFERENTIALLY FLAWED OVERLAT REPAIRED WELDS PIPE AND FIAW GEOMETRIC DETAILS WELD NO. O.D. (1) tp (2) to (3) t (4) L (5)
{in.) (in.) (in.) {in.) Degrees NU-3-5 14.00 0.76 0.275 1.035 360 NZ-3-43 8.63 0.53 0.239 0.769 360 NZ-3-44 8.63 0.53 0.349 0.879 360 NZ-3-95 8.63 0.53 0.326 0.856 360 NOTES:
- 1. O.D. = Outside diameter
- 2. tp = Pipe wall thickness
- 3. to = Total weld overlay repair thickness
- 4. t = tp + to l S. L = Evaluation flaw length i
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!- Oyster Creek :
- Cycle 13R Outage ;
Weld Overlay Design j l .;
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