ML20198L406
| ML20198L406 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/29/1982 |
| From: | De La Pintiere INTERCONTROLE, INC. |
| To: | |
| Shared Package | |
| ML20197J316 | List:
|
| References | |
| FOIA-85-59 NUDOCS 8606040279 | |
| Download: ML20198L406 (32) | |
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5219 W. Clostwater. Suite M. Kennewick. WA 98336. Tot (500) 7
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Texas Utilities Generating Company Customer :
Comanche Peak Steam Electric Station Glen Rose Texas 76043 TUGC0 P.O. N61-003-110C Reference :
MULTIFREQUENCY ED0Y CURRENT EXAMINATION OF CONTAIPNENT SPRAY HEAT EXCHANGER TUBES i
Comanche Peak Unit =1, Train A & 8 and Unit #2, Train A Volume 1 : BASELINE EXAMINATION REPORT Examination Dates:
September 20 - October 1,1982 Insoected and Recorted Sv:
I Report Emission Date:
October 29, 1982 c/
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0606040279 860527 PDR FOIA GARDE 85-59 PDR
2
- a. mag TABLE OF CONTENTS PAGE 4
1-SCOPEANbPRESENTATION 4
2 - EXAMINATION OBJECTIVE AND EXTENT 5
3 - HEAT EXCHANGER CHARACTERISTICS r
5 4 - TU8E AND INDICATION IDENTIFICATION 6
5 - EXAMINATION lETH00 AND EQUIPMENT 7
6 - REFERENCE DOCUMENTS AND PERSONNEL CERTIFICATION S
7 - EXAMINATION RESULTS 7.1 -CTHX Unit #2, Train A 7.2 -CTHX Unit #1, Train A 7.3 -CTHX Unit #1, Train B 10 8 - RESULTS DISCUSSION 11 APPENDICIES 6
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LIST OF APPENDICE5_
pAGE 11 Appendix #1 Tube Identification Map 12 Appendix #2 Baffle Plate Identification 13 Detection of Damage Under Baffle Plate By a Appendix #3 Multifrequency Mix 14 Appendix #4 Examination Sumary Table 15 Appendix #5 CTHX #2A Dent Distribution Map.
16 Appendix #6 CTHX #1A Examination Results Table 17 Appendix #7 CTHX #1A Wall Loss Distribution Map 18 Appendix #8 CTHX #1A Dent and Cold Work Distribution Map 8
19 Appendix #9 CTHX #1B Examination Results Table 20 Appendix #10 CTHX #18 Wall Loss Distribution Map 21 Appendix #11 CTHX #1B Dent and Cold Work Distribution Map 22 Appendix #12
, Calibration Standard A 23 Appendix #13 Calibration Standard B
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24 Appendix #14 CTHX #2A'- R15T10 Southside 25 Appendix #15 CTHX #1A - RIST9 Northside 26 Appendix #16 CTHX #1A - R15T9 Southside 27 Appendix #17 CTHX #1A - RIST30 Northside 28 l
Appendix #18 CTHX #1A - R15T30 Southside 29 Appendix #19 CTHX #1A - R2 T14 Southside 30 Appendix #20 CTHX #18 - R15T10 Northside 31 Appendix #21 CTHX (IB - R15T10 Southside 32 Appendix #22 CTHX #18 - R11T39 Southside i
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., 4 1.0 SCOPE AND PRESENTATION 1.1 J,qQ.P[
The baseline examination report consists of two volumes:
Volume 1 : Baseline examination report Voliana 2 : Baseline examinatiion data sheets This document is the Volume 1 i
PRE'5ENTATION 1.2 During the period of September 20th to October 1st,1982, a multifrequency l
addy current examination was performed on all tubes of Comanche Peak Containment Spray Heat Exchangers Train A of Unit #2, then Train A and 8 of Unit #1.
This report describes the examination including the tube identification system and the results.
EXAMINATION 08JECTIVE AND EXTENT 2.0 Following a tube failure which occured in Unit #1, Train A containment spray heat exchanger, an examination was performed by addy current 100% of all tubes in two heat exchangers - Unit' #2. Train A and Unit #1, The Train A - with special emphasis given to the baffle plate areas.
main. objective was to determine if besides the two tubes which already l
other tubes would present damage under baffle plate, and if any,
- failed, O
evaluate and locate it.
A multifrequency addy current technique was inglemented, using a two frequency six in order to suppress the baffle plate signal.
As the on-site ' data evaluation indicated damage in some tubes, a supple mentary 100% examination was performed on a third heat exchanger - Un
- 1, Train 8.
Because of the U-bend, tubes were examined one side at a time.
A total of 1,803 tubes were examined on their northside, and 1,828 on their southside.
The number of tubes tested per heat exchanger is presented in the Examination Summary Table.- Appendix #4.
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Iy NEAT EXCH?"'9t CHARACTERISTICS Each Containment Spray Heat Exchanger consists of 610 U-bend, 304 st 3.0 less steel vertical tubes, 3/4 inch 00 diameter and 18 BWG (0.049 inch) wall thickness.
Tubes are about 50 feet long with 10 carbon steel baffle plates.
1 Heat Exchangers were identified as follows:
=Contairunent Spray Heat Exchanger - Unit #2. Train A CTHX #2A
= Containment Spray Heat Exchanger e Unit #1, Train A CTHX #1A
=Contairunent Spray Heat Exchanger - Unit #1, Train B CTHX #1B TtBE AND INDICATION IDENTIFICATION _
During the exuaination tubes were identified in accordance with Appendix 4.0 1 wherein each row was designatdd by a number and each tube within the The two row was numbered starting at T1 for the first tube on the left.
sides of each U-bend tube were identified by their North or South position i
The baffle R11T9 South is the south leg of tube 9 in row 11.
I So tube:
plates were used to locate eddy current indications, and were identified i
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in accordance with Appendix 2.
Baffle plates were nisabered from the reference tubesheet (TS) such that plate 1 was closest to the tubesheet.
A data sheet entry of damage at N5 would indicate tube damage located unde A
the fifth baffle plate'from the tubesheet on the northside of the tube.
data sheet entry of damage at SS-6 would indicate tube damage located between the fifth and the sixth baffle plate from the tubesheet on the southside of the tube.
Plate 10 does not exist in Row 1 to 5.
Following are the entries found in the data sheets:
00 = damage on the outside well of tubing ID = damage on the inside wall of tubing
= cold work under baffle plate CW
= f rrelevant dimensional variation such as shallow ID, small dent, DV t
probe vibration.
= irrelevant signal IS m
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EXAMINATION METHOD AND EQUIPMENT 5.0 As damage was expected under baffle plate, the tube examination was performed by the multifrequency eddy current method.
An internal probe is pulled through the tube; this prob'e is consisting of two coils connected to the impedance bridge of the eddy current instrument and fed simultaneously by thres alternating currents of three different frequencies F, F, and F
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A The The system is balanced in a part of tubing free of discontinuity.
vicinity of a discontinuity within or near the tube wall disturbs the probe magnetic field, then unbalances the impedance bridge.
The unbalancement voltage is amplified and after processing displayed on a cathode ray tube and recorded on strip chart.
Data from the two frequencies F1 and F2 is collected in differential mode, thus optimizing detection of localized discontinuities. Data from is collected in absolute mode, thus optimi::ina the third frequency FA An extraneous discontinuity such detection of gradual discontinuities.
hides the signature of a damage located
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as a baffle plate distorts or under it.
1 2 in a mixing By mixing the. data from two different frequencies F. and F module C, it is possible to suppress the baffle plate signal, thus 1
revealing only the underlying damage.
Appendix 3 demonstrates the capahtlity of this technique to extract damage signal from a baffle plate signal by presenting the signal before mixing (basic frequency output) and after mixing (mixing module output).
In order to detect the very shallow damage expected (about 5% of wall loss), we optimized the mixing technique at its best and exceptionally lowered the reportability threshold to 5% of wall loss, though the threshold cannonly used is 20% of wall loss.
Appendix 3 shows that a 5% damage can be detected with a signal to noise ratio of (3)three to one on the mixing output, but this is the limit of detectability usually admitted.
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Whenever possiblephase analysis has been used to evaluate the damage by comparison with the artificial discontinuities in the ASNE Standard However when a extraneous discontinuity such as cold work in the
" A".
same location would prevent to use this method, we used amplitdde analysis.
Flaws were sized from 100% down to 10% of wall loss, then only report-ed if found equal or greater than 51 but less than 10%.
Eventually we exceptionally reported all damage we detected, and evaluated less than 5% deep, because they will be useful for the damage process understanding and further corrective action.
1 The examination was perfonned with the Intercontrole IC3FA multifrequency addy current unit which has the capability to cancel baffle plate signals and simultaneously obtain data from several frequencies and modes (absoi.ute and differential) for high resolution of several types of damage.
150KHZ, the sixing diffarential The basie difforential frequency F2 was frequency F1 was 300 KHZ and the absolute frequency FA was 70 KHZ.
The rest of the equipment consisted of:
1 Brush Gould Strip Chart Recorder - 4 Channels 1 Hewlett Packard FM Magnetic Tape Recorder - 4 Channels 1 Cathode Ray Tube Textronix with Storage 1 Differential Internal Rigid Probe - 0.61 inch diameter 6.0 REFERENCE 00CtMENTS AND PERSONNEL CERTIFICATION The examination was performed in accordance with:
Multifrequency eddy current examination procedure, ref: TC-ETIS-002 Multifrequency eddy current examination equipment calibration procedure l
to suppress support plate signal for.750 x.049 SS 249-304 tubing, ref: TC-ETIS-001 Field Modification Record, ref: TC-ETIS-001-M1 TUGC0 Specifications, ref: 4916 ASME Code Section Y.and XI 1
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Personnel involved were certified in accordance with Interco QA-PCER-012 procedure for " Personnel Qualification and Certification", ref:
rev. A, which adheres to ASNT recormnended practice SNT-TC-1A.
Louis de la Pintiere - Level 'III - Intercontrole Inc. - Data E o
Robert Ferris - Level II - Intercontrole, Inc. - Data Evaluation Dan Spake - Intercontrole Inc. - Data Collecting and Maintenance Subcontractors to Intercontrole were certified an accordance respective qualification procedures which adheres to ASNT recomended practice SNT-TC-1A.
Lee Nye - Level II - Betsco - Data Collecting t
Jerry White - Level II - Betsco - Data Collecting Procedures, certification documentation, equipment calibration records, and calibration standard documentation were supplied prior to commencing I
the examination.
7.0. EXAMINATION RESULTS 7.1. CTHX Unit d2, train A The examination summary table (appendix #4) shows that n'o l
damage has been reported.
for 24 tubes presented dent but randomly distributed, except 10 tubes in row 13 between plates 9 and 10 (appendix 5).
Most of the tubes from this heat exchanger presented a back-ground noise all along their length (appendix 14).
- 1. train A 7.2. CTHX Unit The examination summary table (appendix #4) shows that 29 tubes presented damage; From them only 11 were reportable and 2 were greater than 10% of wall loss on the 00.
However, from the two, greater than 10%, only one was under R15 79, with an 00 80% at N9 (appendix #6 and #15).
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tubes with 00 damage indica-Except R2 T14 (appendix #19) all tion were on the peripheric tubes, mainly row 15 southside f
- 7) and only under plates 9 or 10 (appendix #6)
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's 112 tubes presented indications under baffle plates which were The latter indications interpreted as cold work signals (appendix #4).
13, 14, 15 north and south have been found in almost all tubes of rows side and some of row 12 (appendix #8).
j These cold work signals were present under most baffle plates from 5
plate 4 up to plate 10 in rows 14 and 15 (see R15 T9 on appendix *1 and #16) and from plate 8 in rows 12 and 13.
86 tubes presented dent signals (appendix #4). Almost all of them are
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north and' south and located between the plates 9 and in rows 7 to 10 10 (appendix #8).
Also a mjority of this heat exchanger tubes showed a signal between I
baffle plates 8 and 9. This indication which is not a damage signal has been however reported in the data sheets (volume 2) as IS 8-9 7.3. CTHX Unit #1. train 9 The examination sussiary table (appendix #4) shows that 15 tubes presented damage; From them only two were reportable and greater than 10% of wall loss, one on the 10 and one on the 00.
All tubes with 00 damage indication were in row 15 around tube R15 T10 except R13 T9, R14 T9, R14 T12 (appendix #10).
In fact the only. tube with reportable 00 damage is R15 T10 with a,35%
at N9, a 15% at S10 and a 5400 <10% at N10, plus a less than 5%~ at
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59 and S8 (appendicies 79, #20 and #21).
66 tubes presented indications under plates which were interpreted as cold work signals (appendix #4). The latter indications have been found in rows 13, 14, 15 and some of them in row 12 (appendix #11).
These cold work signals were present mostly under plates 7 up to 10.
Tube R11 T39 had a 10 40% at 56-7 (appendix #22).
j 65 tubes presented dent signals (appendix #4); The ones located l
between plates 9 and 10 were in rows 10 to 13; the ones under plate 10 were mostly around rows 8 to 10 (appendix #11).
A majority of this heat exchanger tubes showed a signal at 8-9. This indication which is not a damage signal has been however reported in the data sheets (volume 2) as IS 8-9.
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3 8.0, RESULTS OfSCUSSION The examination sunnary table (appendix #4) shows than CTHX #1A has been found to be the most affected.
The distribution between 00 damage signals (peripheric tubes), cold liar.
work signals (rows 12 to 15) and dent signals (rows 7 to 10) is pecu The same type of indication was found in CTHX #18, but in a lesser amount (about half).
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All damages detected were of very small amplitude, about 1/10th of the 15,17,19,20) except one :
ASME calibration flaws (appendicies #
RIS T10 of CTHX #18 which presented a good amplitude under N10 (ap I
- 20).
Signals of such a small amplitude might be either of shallow 00 wear origin (when <40%) or crack origin (when >40%). It is important to baffle plate, cold work, 00 war remember that in a same location and sometimes crack conditions might have been simultaneously present.
The flaws found in R2 T14 (CTHX #1A, appendix #19) and R11 T39 (CTH
- 18, appendix # 22) do not seem to be related to vibration process.
No indication similar to the ones found in CTHX #1A and 8 has detected in CTHX #2A. However the background noise present in most o the tubes of this heat exchanger did not pennit to obtain a signal noise ratio as good as on the others. This noise originated from the 10 condition of tubing; When pulling probe, rusty deposit was found present inside the tubes.
have been Compared with CTHX #1A and B, much less tubes with dents found in CTHX #2A.
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aconndix 4 3 TUGC0 - Comanche peak - Containment Sorav Heat Exchance" Q}@@@@@3@@ $
DETECTION OF DAMAGd UNDER BAFFl.E Pt. AT Mut.TIFREQUENCY MIX L
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i CTHX #2A CTHX #1A CTHX #18 Heat Exchanger Identification 610 610 610 Tubes Total MS M8 610 Northside 1
T&s M W 610 608 610 Southside 0
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,Anoendix s 4 TUGC0 - Comanche Peak - Containment Sorav Heat Exchancer
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