ML18101B295
| ML18101B295 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 03/20/1996 |
| From: | Eric Simpson Public Service Enterprise Group |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LR-N96076, NUDOCS 9603280137 | |
| Download: ML18101B295 (8) | |
Text
Public Service Electric and Gas Company E. C. Simpson Public Service Electric and Gas Company P.O. Box 236, Hancocks Bridge, NJ 08038 609-339-1700 Senior Vice President - Nuclear Engineering MAR 2 0 1996 LR-N96076 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:
EDDY CURRENT DATA FOR TUBE PULL CANDIDATES FROM STEAM GENERATOR 24 SALEM GENERATING STATION UNIT NO. 2 DOCKET NO.: 50-311 On March 5, 1996 a meeting was held between PSE&G and the NRC to discuss Salem steam generators.
At the meeting PSE&G agreed to send to the NRC the eddy current results on the six tube pull candidates from Unit 2 Steam Generator 24.
The attachment to this letter provides the requested information.
If you require any additional information on this issue, please contact me or D. Garchow, Director-Steam Generator Project.
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Document Control Desk LR-N96076 2
C Mr. T. T. Martin, Administrator - Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Mr. L. N. Olshan, Licensing Project Manager -
Salem U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, MD 20852 Mr. C. Marschall - Salem (X24)
USNRC Senior Resident Inspector Mr. K. Tosch, Manager, IV Bureau of Nuclear Engineering 33 Arctic Parkway CN 415 Trenton, NJ 08625 MAR 2 0 1996 95-4933
ATTACHMENT TO LR-N96076 TUBE PULL CANDIDATES FROM STEAM GENERATOR 24
1.0 INTRODUCTION
During the Eddy Current examination of Salem Unit 2 Steam Generators, Public Service Electric and Gas elected to pull tubes to perform further analysis on observed indications. Six tubes were selected from Steam Generator 24 to understand the Shallow Outside Diameter Indications (SOD's) and Single Circumferential Indications (SCI's) reported by the data analysts. The six tubes are R11C27, R11C31, R13C36, R19C45, R20C26 and R21C71. The eddy current data for the original examinations and for the pre-tube pull additional examinations is shown in Table 1.
Following is a summary of the eddy current data from Table l(attached):
Rl 1 C27 has a shallow outside diameter indication within the 2nd support plate on the hot leg side (02H).
Rl 1 C31 has a single circumferential indication within the 5th support plate on the hot leg side (05H).
R13C36 has a shallow outside diameter indication within the 1st support plate on the hot leg side (OlH), and a shallow outside diameter indication within the 3rd support
- plate on the hot leg side (03H).
Rl9C45 has a single volumetric indication within the 2nd support plate on the hot leg side (02H), and a single circumferential indication within the 3rd support plate on the hot leg side (03H).
R20C26 has a multiple axial indication within the 3rd support plate on the hot leg side (03H), and a single circumferential indication within the 4th support plate on the hot
' leg side (04H).
R21C71 has a single volumetric indication above the 4th support plate on the hot leg side (04H), and a shallow outside diameter indication within the 5th support plate on the hot leg side (05H).
Prior to tube pulling, these six tubes were reexamined with various NDE techniques including bobbin coil, rotating pancake coil RPC (plus point and standard pancake coil), multicoil array profilometry, and ultrasonic testing (UT).
1
2.0 DATA ACQUISITION Equipment All examinations were performed by Framatome Technologies using a Zetec Miz30-4 eddy current instrument, Zetec's or Framatome's remote manipulators, Zetec RPC motor unit and Zetec probes. Three types of RPC probes were used: Plus Point, Standard 3-Coil and Gimbaled Plus Point designed for examination of dented intersection. Probe descriptions are discussed in more detail below.
Plus Point Probe The Plus Point probe has three coils mounted around the probe body circumferentially, 120 degrees apart. The. 080 coil was optional during the original examinations. Additional detail is provided below.
(1) 0.115 inch diameter pancake coil.
(7)
Plus point coil.
(3) 0.080 inch diameter shielded high frequency pancake coil.
Standard 3-Coil *Probe This probe has three coils mounted around the probe body circumferentially similar to the Plus Point probe. Additional detail is provided below.
(1) 0.115 inch diameter pancake coil.
(2) circumferential wound coil, sensitive to axially oriented indications (Axial).
(3) axially wound coil, sensitive to circumferential oriented indications (Circumferential).
Coils 2 and 3 are often referred to as 11 directional coils 11 since they are used to help determine the orientation of an indication.
Gimbaled Plus Point Probe The Gimbaled probe has a single plus point coil mounted on the probe body. A specially designed mechanical device allows the coil to ride the surface of the dent transitions, reducing lift off signal variations.
2
- 3. 0 Calibration Standards of RPC Examinations A guide tube standard was used for RPC examinations. It contains three Flat Bottom Holes (FBH's), 11 Electron Discharged Machine (EDM) notches, copper simulation strip and a simulated tube support ring. The types of artificial flaws in the standard are listed below. All notches are 0.5" in length and.005" i°' width.
Orientation Location 20%
40%
60%
80%
100%
Comments Circ.
ID x
x Circ OD x
x x
.X Axial ID x
x Axial OD x
x x
FBH's OD x
x x
ASME For technique.verification an Expansion.Transition Standard with ID and OD notches in the transitions was utilized. The four artificial flaws in this standard are listed.
below.
Orientation Location 20%
40%
60%
80%
100%
Comments Circ.
ID Exp.
x Transition Circ OD Exp.
x Transition Axial ID Exp.
x Transition Axial OD Exp.
x Transition 3
4.0 Test Configurations Test configuration for the Plus Point Probe was as follows:
Frequency 115 Pancake Trigger Plus Point 080 High Freq.
300 kHz.
Ch#l Ch#2 200 kHz.
Ch#3 Ch#4 100 kHz.
Ch#5 Ch#6 Ch#7 10 kHz.
Ch#8 600 kHz.
Ch#9 Test configuration for the Standard 3-Coil was as follows:
Frequency 115 Pancake Trigger Axial Circ. Coil 300 kHz.
Ch#l Ch#2 Ch#3 200 kHz.
Ch#4 Ch#5 Ch#6.
100 kHz.
Ch#7 Ch#8 Ch#9 Ch #10 10 kHz.
Ch#ll Test configuration for the gimbaled plus point probe was as follows:
Frequency Plus Point Coil Trigger 300 kHz.
Ch#l 200 kHz.
Ch#2 100 kHz.
Ch#3 Ch#4 10 kHz.
Ch#5 4
. ~,
- 5. 0 Analysis All data received a primary and secondary analysis. Framatome Technologies and Rockridge TechnolOgies performed the primary analysis and Zetec Inc. the secondary analysis. The two reports were then compared for discrepancies and resolved by the Resolution Analyst. All reported indications 2.. 40% or I-codes required a concurrence by a second party Resolution Analyst.
Voltage normalization for all the RPC data was to set the 40% OD axial EDM notch to 5.00 volts. For the Plus Point and Gimbaled probes the Plus Point coil was utilized to set the voltage normalization from 300 kHz frequency. For the Standard 3-Coil probe the.115 pancake coil was utilized for voltage normalization.
Length measurement for each indication is also estimated using the Zetec software Eddynet 95. These length measurements are either for the axial or circumferential length of a given indication. There was no attempt to determine depth since the outside diameter indications (SODs & SCis) fall outside the typical flaw plane.
5
ROW 11 11 13 19 20 21 COL 27 31 36 45 26 71 LEGEND:
MAI=
NOD=
NDF=
NOR=
NOi=
SCI=
SOD=
SVI =
TABLE 1 SALEM UNIT #2. STEAM GENERATOR 24 TUBE PULL CANDIDATES 96 EXAMINATION LOCATION BOBBIN CALL TSH+ 0.00 NDD NDF 01H+O.OO NDD NDF 02H+0.38 NDD SOD 03H+O.OO NDD NDF TSH+0.50 NDD NDF 01H+O.OO NDD NDF 02H+O.OO NDD NDF 03H+O.OO NDD NDF 04H+O.OO NDD NDF 05H+0.11 NDD SCI 06H+O.OO NDD NDF TSH+0.00 NDD NDF 01H+0.18 NDD NDF 02H+O.OO NDD NDF 03H+0.20 NDD SOD 04H+O.OO NDD NDF TSH+0.00 NDD NDF 01H+O.OO NDD NDF 02H-0.24 NDD NDF 03H-0.09 NDD SCI 04H+O.OO NDD NDF TSH+0.00 NDD NDF 01H+O.OO NDD NDF 02H+O.OO NDD NDF 03H+0.06 NDD MAI 03H+0.09*
NDD MAI 04H+0.06 NDD SCI 05H+O.OO NDD NDF TEH+4.92 NDD NDF 01H+O.OO NDD NDF 02H+O.OO NDD NDF 03H+O.OO NDD NDF 04H+22.44 NDD NDF 05H+O.OO NDD SOD 06H+O.OO NDD NDF MULTIPLE AXIAL INDICATIONS NO DEGRADATION DETECTED NO DEGRADATION FOUND NO DENT REPORTED NON QUANTIFIABLE INDICATION VOLTS 2.89 2.61 3.33 2.48 1.69 1.03 1.32 1.67 SINGLE CIRCUMFERENTIAL INDICATION SWALLOW OUTSIDE DIAMETER INDICATION SINGLE VOLUMETRIC INDICATION
+POINT DEGREE 164 128 152 60 129 112 148 155 ADDITIONAL INDICATION REPORT AT THIS LOCATION LENGTH (ARC) 0.54 (70) 0.57 (74) 0.13 0.20 0.73 (96)
DENTS NDR NDR NDR 2.55V NDR NDR NDR NDR 9.91 v NDR 19.16 v NDR 3.84V 5.89V 4.33V 12.65V NDR NDR NDR 10.11 v 14.82V 2.47V NDR 2.61 v 7.99V 2.75V NDR NDR NDR NDR NDR NDR NDR NOTES:
PRE TUBE PULL EXAMINATION BOBBIN 8X1 PROFILE
+POINT 3-COIL CALL VOLTS DEGREE LENGTH (ARC)
NDD NDF NDD 775.4 NDF NDD 775.3 SOD 1.91 144 0.75 (98)
NDD 775.0 NDF NQI NDF NDD 775.7 NDF NDD 775.3 NDF NDD 774.5 NDF NDD 773.7 NDF NDD 776.8 SCI 2.28 122 NDD 774.0 NDF NDD NDF NDD 774.3 SOD 1.77 151 0.23 (30)
NDD 774.4 NDF NDD 773.6 SOD 2.56 150 0.51 (67)
NDD 773.1 NDF NDD NDF NDD 775.3 NDF NDD 775.7 SVI 1.26 125 0.13 NDD 775.4 SCI 1.66 51 NDD 774.0 NDF NDD NDF NDD 774.7 NDF NDD 774.8 NDF NDD 774.7 MAI 0.65 132 NDD 773.9 SCI 0.92 73 NDD 774.6 NDF NDD N/A SVI 1.51 132 0.27 NDD 775.4 NDF NDD 774.7 NDF NDD 775.3 NDF NDD 775.4 SVI 1.50 41 0.27 NDD 775.1 SOD 2.07 153 0.49 (64)
NDD 776.1 NDF ALL MEASUREMENTS ARE FROM THE CENTER OF THE SUPPORT PLATE OR THE TUBESHEET SECONDARY FACE.
NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF NDF IN THE PRE-TUBE PULL DATA SOD's AND ADDITIONAL REPORTED INDICATIONS ARE GIVEN LENGTH MEASUREMENTS.