ML20206J827
| ML20206J827 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 06/23/1986 |
| From: | Churchill B GENERAL PUBLIC UTILITIES CORP., SHAW, PITTMAN, POTTS & TROWBRIDGE |
| To: | Paris O, Shon F, Wolfe S Atomic Safety and Licensing Board Panel |
| References | |
| CON-#286-716 OLA, OLA-2, NUDOCS 8606270285 | |
| Download: ML20206J827 (100) | |
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1 9 SHAW, PlTTMAN, PoTTs & TROWBRIDGE
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- WRITER S DIRECT DIAL NuMsER Sheldon J. Wolfe, Chairman Oscar H. Paris 1 Administrative Judge Administrative Judge Atomic Safety and Licensing Atomic Safety and Licensing Board Panel Board Panel U.S. Nuclear Regulatory U.S. Nuclear Regulatory Commission Commission Washington, D.C. 20555 Washington, D.C. 20055 Frederick J. Shon Administrative Judge Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D.C. 20555 In the Matter of GPU Nuclear Corporation, et al.
(Three Mile Island Nuclear Station, Unit No. 1) l Docket Nos. 50-289-OLA-1 and 50-289-OLA-2 (Steam Generator Plugging Criteria)
Dear Administrative Judges:
For the information of the Licensing Board, I am enclosing Licensee's "Results of Outage SM ECT Examinations of the TMI-l OTSGs" which was submitted to the NRC Staff on June 17, 1986.
The initial report of the eddy cur ent test results was forwarded to the Board on May 2, 1986.
Sincerelyb L
8606270265 860623 PDR ADOCK 0500
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G Bruce W. Churchill Enclosure cc: Service List (attached w/ encl.)
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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION Before the Atomic Safety and Licensing Board Panel l
In the Matter of )
)
GPU NUCLEAR CORPORATION, et al. ~ - -
) Docket Nos. 50-289-OLA-1
) 50-289-OLA-2
) (Steam Generator (Three Mile Island Nuclear ) Plugging Criteria)
Station, Unit No. 1) )
1 SERVICE LIST i l
Sheldon J. Wolfe, Chairman Docketing and Service Section (3)
Administrative Judge U.S. Nuclear Regulatory Commissier Atomic Safety and Licensing Washington, D.C. 20555 :
Board Panel i U.S. Nuclear Regulatory Commission Three Mile Island Alert, Inc. l
) Washington, D.C. 20555 315 Peffer Street
) Harrisburg, PA 17102 !
Administrative Judge Thomas Y. Au Atomic Safety and Licensing Assistant Counsel Commonwealth Board Panel of Pennsylvania U.S. Nuclear Regulatory Commission Dept. of Environmental Resources t
Washington, D.C. 20555 Bureau of Environmental Resources
" Room 505 Executive House Frederick J. Shon P. O. Box 2357 Administrative Judge Harrisburg, PA 17120 Atomic Safety and Licensing Board Panel Louise Bradford U.S. Nuclear Regulatory Commission Three Mile Island Alert, Inc.
Washington, D.C. 20555 1011 Green Street
. Harrisburg, PA 17102 Mary E. Wagner, Esq. (2)
Office of Executive Legal Director
~
U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Atomic Safety and Licensing Appeal Panel U.S. Nuclear Regulatory Commission .
- Washington, D.C. 20555 l
! Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D.C. 20555 i
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GPU Nuclear Corporation Nuclear ;::ers::,eo o
Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
June 17, 1986 5211-86-2109 Office of Nuclear Reactor Regulation Attn: J. F. Stolz, Director PWR Projects Directorate No. 6 U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Stolz:
Three. Mile Island Nuclear Station Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 ,
Post Eddy Current Inspection Report Following the completion of the Eddy Current Inspection of TMI-l A and B steam generator tubes, Technical Specification 4.19.5a requires a report to be submitted, of the number of tubes repaired or removed from service, within 15 days of the completion of the inspection. Tube plugging was completed on April 18, 1986. The requisite information for the SM eddy current outage was provided to the NRC on May 2,1986 (Reference 1).
Technical Specification 4.19.5b requires that the complete results of the steam generator tube inservice inspection be reported to the NRC within 3 months following completion of the inspection, including (a) number and extent of tubes inspected, (b) location and percent of wall thickness penetration for each indication of an imperfection; and (c) identification of tubes repaired or removed from service. TDR 781 Rev.1, "Results of Outage SM ECT l Examinations of the THI-l OTSG's", provides a comprehensive assessment of the i SM eddy current inspection results, and addresses the specific reporting requirements of Technical Specification 4.19.5b.
TDR 781 also includes a tabulation of degraded tubes by tube number, indication elevation, signal amplitude, phase angle, and throughwall i penetration, and a comparison on a tube by tube basis with the results of the 1984 inspection. This information exceeds the reporting requirements of Technical Specification 4.19.5.b and is provided for Outage SM as requested by NRC's consultant C. Dodd of ORHL during a meeting with the NRC staff on May 15,1986.
GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
r A 5211-86-2109 June 17, 1986 This letter fulfills the requirements of Technical Specification 4.19 for Outage SM.
Sincerely,
. 04.{ - l b- Y t'H'.D.H6hii Vice President and Director, TMI-l HDH/SK/pa(3508f) cc: R. Conte J. Thoma
Reference:
(1) GPUN Letter 5211-86-2085, H. D. Hukill to J. F. Stolz,
! " Post Eddy Current Inspection Report", May 2,1986.
l 1
I I
l
t A 781 REVISION N3. 1 g g T3R NO.
SUDGET 123125 PAGE 1 Op 50 TECHNICAL DATA REPORT ACTIVITY NO.
Quality Assurance /SPP DEPARTMENT /SECTION TMI Unit 1 OTSG Eddy Current Program RELEASE DATE REVISION DATE 6/4-#6 DOCUMENT TITLE: Results of Outage SM ECT Examinations of t.he TMI-l OTSGs.
DATE APPROVAL!S) SIGNATURE DATE ORIGINATOR SIGNATURE .- n r M. T. Torborg M M L 2 4//2/Ag R. O. Barley M h.4 c (cdf2l%
/ T. J. Pattersonj g j j ] gy/g CC. Kazanas Qggd d/g c APP,RQVAl DATE s f0R EXTERNA,L DihRIBUTION ss wu- e- ,,
g3a j R. F. Wilhon Does this TDR include recommendation (s)? Oyes G#o if yes. TFwn/TR a
- OlSTRIBUTION A8STRACT: Statement of Problem: On March 21, 1986 TMI-l was shut down to permit a planned (Outage SM) Eddy Current l Examination of the tubing in the Once Through Steam Generators 1 B. A. Bader (OTSG's). The examinations were performed in accordance with the inspection program outline contained in GPUN Topical B. E. Ballard Report TR-008 and also satisfied the surveillance requirements R. O. Barley of Technical Specification 4.19. l I
G. R. Capodanno Summary: The scope of the examinations included approximately
- 97. f the total tubes in each OTSG. The examinations were J. J. Colitz performed to determine the condition of both the 55' unexpanded I. R. Finfrock portion of the tubes and the kinetically expanded areas in the upper tube sheet. The examinations included a sample F. S. Giacobbe of tubes with no previously identified degradation and all J. S. Jandovitz previously identified degraded tubes.
H. S. Jung Indications reported during the 1986-5M ECT examinations were characterized and compared to the indications reported N. C. Kazanas during the 1982 and 1984 examinations. In addition the 1986-W. L. Kimmick SM examination results for previously degraded tubes were l
C MPared to the 1984 examination results to determine if there R. Ostrowski vas any ongoing corrosion or degradation. ;
- * *E '#8 " Results: As a result of the 1986-5M ECT examinations ten M. T. Torborg (10) tubes in OTSG A and fifteen (15) tubes in OTSG B were removed from service. In addition, twenty four (24) tubes
, in OTSG A and nine (9) tubes in OTSG B were determined to have indications of 20-497. through wall and will be monitored as degraded tubes during the next examination.
Conclusions:
Based on the results of the examinations CPUN was able to conclude there was no evidence of new degradation in the OTSGs and no evidence of continuing degradation of previously degraded tubes. The characterization and comparison of the newly reported indications showed they were small, inner diameter initiated indications which were consistant, in both location and size, with the indications identified during the 1984 examinations.
Aooooo30 4.es eCOVER PAGE ONLY l
f M -
I DOCUMENT NO.
M MF T:R-781 Page 1A ,
TITLE Results of Outage SM ECT Examinations of the I TMI-l CTSGs.
REV
SUMMARY
OF CHANGE APPROVAL DATE 1 Appendix I, Pages 7 and 9, corrected Kinetic d-/d-((
Expansion Transition Iccation for tubes A-77-123, A-6-43 and A-126-90. ,
t.-/( -d de Appendix I, Pages 7, 8, 9 and 11, added i
" asterisk" note. M C NA 2 Appendix I, Pages 9 and 11, clarified title by I adding "During 1983 Baseline".
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- A000003812 83
t k TDR 781 REV!STON 1 PAGE _2_ of 50 l TABLE OF CONTENTS PAGE NO.
I. INTRODUCTION ............................................. 3 4
II. RESULTS ..................................................
6 III. EDDY CURRENT EXAMINATION .................................
IV. EXAMINATION CATEGORIES AND RESULTS ....................... 13 13 A. EXAMINATIONS REQUIRED BY T.S. 4.19 ..................
- 1. ISI Tubes ...................................... 13
- 2. 3% Random Sample Tubes ......................... 20 B. EXAMINATIONS REQUIRED BY TR-008 ..................... 23
- 1. Sample. Tubes Adjacent to Plucced Tubes (Wear Tubes) ................................... 23
- 2. Sample. Tubes in High Plue Density Area ........ 25
- 3. Kinetic Expansion Area Indications ............. 27
- 4. 3% Samole. UTS Only ............................ 29 C. GPUN ELECTIVE EXAMINATIONS ..........................
- 3'1
- 1. Tubes with Indications Not Confirmed by 8xl Absolute Exam .................................. 31
- 2. Lane / Hedge Area Tubes .......................... 34
- 3. Gao Tubes ...................................... 38
- 4. Special Category Tubes ......................... 40 V. LI5CUSSION OF RESULTS .................................... 42 VI. CONCLUSIONS .............................................. 49 VII. REFERENCES ............................................... 50 APPENDIX I ECT EXAMINATION DATA SUMMARIES .................
APPENDIX II REVIEW OF PREVIOUS ECT DATA ....................
APPENDIX III ISI TUBE LIST ..................................
1
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F N TDR 781 REVISION 1 PAGE _3_, of 50 I. INTRODUCTION On March 21, 1986 THI-1 was shut down to permit a planned Eddy Current (ECT) examination of the tubing in the Once Through Steam Generators (OTSGs).
The examinations were performed in accordance with the inspection program outline included in GPUN Topical Report TR-008 (Reference 1). The examination also satisfied the requirements of THI-1 Technical Specification 4.19.
(Reference 2)
In general terms, the scope of the examinations included a 3% random sample, all previously identified degraded tubes, special examinations required by TR-008 and additional groups of tubes which GPU elected to examine. This scope included approximately 9% of all tubes in each OTSG.
The scope of the examination included both the unexpanded and the kinetically expanded portion of the tubes. The examination of the unexpanded portion was performed using the Dual Examination Method, explained in TDR 423 (Reference 3), while the examination of the kinetically expanded portion was performed using the 8xl absolute technique. The latter is required due to the variation in the diameter of the tube.
The 1986 ECT data was compared to 1982 data (prior to kinetic expansion) and 1984 data (post hot functional testing) where available. These comparisons were used to characterize the 1986 indications and to determine if there was evidence of new or ongoing degradation.
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t b TDR 781 REVISION 1 l PAGE _4_ of 50 II. RESULTS In total, GPUN examined 1913 tubes in OTSG A and 1660 tubes in OTSG B.
As a result of these examinations, ten (10) tubes in OTSG A and fifteen (15)
, tubes in OTSG B were removed from service (plugged). Of these tubes, fourteen (14) were plugged due to indications which exceeded the 50% T.W. plugging .
limit. Two (2) tubes were plugged because they exceeded the 20% T.W. plugging limit for the Lane / Lane Wedge area. An additional eight (8) tubes were preventatively plugged due to distorted tubesheet entry signals or other anomalies for which accurate percent through wall determinations could not be made. In addition, one (1) tube was plugged due to a stuck eddy current probe which could not be retrieved. Detailed results are included in following
- sections.
l The comparison of the 1982, 1984 and 1986 ECT results showed the inner diameter indications occurred in the same axial and radial locations of the OTSGs during all three examinations. The characterization of.the 1986
- Indications by percent through wall, voltage and circumferential extent showed
! that the indications were similar to those identified during the 1984 examinations.
The examination and evaluation of the previously degraded tubes showed no evidence of ongoing degradation or propagation of existing indications.
This was determined through by a comparison of the 1984 and 1986 percent through wall values for previously identified inner diameter indications which
! showed a mean decrease of 2.6% through wall from 1984 to 1986. This change has been determined to be well within the repeatability of the ECT process.
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I b TDR 781 -
REVISION 1 PAGE 5 of 50 The "no growth" conclusion was further supported through a review of the 1982 and 1984 data for previously unreported indications. This review showed that most of the indications could be found during a reevaluation of the previous data. This is consistent with the reevaluations performed following both the 1983 and 1984 examinations which are documented in References 1 and 6.
In addition to the indications which were characterized and compared to the 1982 and 1984 results, another set of approximately ten (10) indications were distorted and could not be characterized. These indications occurred mainly in the entrance to the upper tube sheet. Because the signals were j distorted, GPUN could not accurately determine the percent through wall penetration of the degradation and the tubes were preventatively plugged as l
discussed above.
I 1
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TDR 781 REVISION 1 PAGE 6 of 50 III. ED0Y CURRENT EXAMINATIONS TECHNIOUES 1
The ECT examinations were performed using the same basic methods which were developed and quallfled by GPUN in 1982 and 1983. These methods include:
- Dual Examination Method, for the unexpanded portion of tube
- Bobbin Coll Absolute Method, for the detection of wear
- 8x1 Absolute Method, for the examination of the expanded portion.
The following is a brief description of each method. The detailed examination procedures are contained in THI-l Surveillance Procedure 1300-48 (Reference 5).
Dual Examination Method: The portion of tubing between the roll expansion in the lower tube sheet and the kinetic expansion in the upper tube sheet is examined using the Dual Examination Method which GPUN developed and qualified in 1982 (Reference 3). This technique consists of first examining the tubes using the .540" High Gain Standard Olfferential (H.G.S.D.) to screen Indications for further evaluations.
Tubes with .540" H.G.S.D. Indications are then examined using the 8xl absolute technique to determine if the indications are relevant and to determine the circumferential extent. For confirmed indications, the characterization and disposition of the tubes is based on the following:
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l TOR 781 l REVISION.1 PAGE 7 of 50 l
l' Percent Through Wall - Based on phase analysis of the .540" H.G.S.D. (see Reference 4).
Circumferential Extent - Based on number of 8xl coils.
Signal Voltage - Based on .540" H.G.S.O.
Axlai Location - Based on .540" H.G.S.D.
NOTE: The amplitude, phase angle and axial location of the 8xl Absolute are also used to confirm the .540" H.G.S.D.
Indications.
Wear Examinations: The examination for the detection of gradual, outer diameter tube wear is performed during the .540" H.G.S.D. examinations.
This is done by operating one channel of the multi-frequency ECT instrument in the 200 kHz absolute mode. The use of the absolute mode permits detection of gradual changes in the tube wall which cannot be detected during a differential examination. Indications which appear only in the absolute channel are therefore screened as possible wear.
The suspect area is then examined using the 8xl absolute probe to provide additional data, i
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TDR 781 REVZSION 1 PAGE 8 of 50 8x1 of Upper Tube Sheet: The 8xl of the upper tubesheet was performed using the MIZ 18 ECT instrument and .187" diameter coil 8xl probe. The examinations included the portion of the tubes from the tubesheet entry to 6" above the kinetic expansion transition. Indications detected during this examination were recorded by number of coils, maximum coil amplitude and the phase-angle of the signal. No percent through wall determinations were made for these indications.
EXAMINATION EXTENT The .540" H.G.S.D. probe is used to examine the unexpanded length of the tube from the lower roll transition in the lower tube sheet to the kinetic expansion transition in the upper tube sheet. Although Technical Specification 4.19 requires the examination of only the portion of tubing between the secondary faces of the upper and lower tube sheets, the majority of the inspected tubes were examined over the entire unexpanded length.
As in 1982 and 1984, some tubes were constricted in the lower tubesheet (apparently a result of explosive plugs in adjacent tubes) and would not pass the .540" probe. This resulted in several probes becoming lodged and required personnel to enter the OT5G to remove them. Because of this problem, the extent of the examination was reduced to eliminate the examination of the lower tube sheet. As a result, approximately 309 tubes in OTSG A and 103 tubes in OTSG B, were examined from the secondary face of the lower tube sheet through the kinetic expansion transition in the upper tube sheet.
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e v TDR 781 REVISION 1 PAGE _9_ of 50 This decision was driven by ALARA concerns and justified by the fact that no confirmed degradation had been identified in the approximately 2300 lower tube sheets examined to that point. Since the TMI-1 Technical Specification required the examinations be completed only to the secondary face of the lower tube sheet, the examinations were considered complete and no follow up examinations were performed using a smaller probe.
i For the 8x1 examinations of the upper tube sheet, the length of tubing I
from the 15th T.S.P. to the upper tube end was examined. The data evaluation process included the length of tubing from the secondary face of the upper tube sheet to a point 6" above the kinetic expanston transition.
f RECORDING OF INDICATIONS When analyzing the eddy current data, various indications are recorded by the data analyst. These indications fall into two basic groups; Relevant Indications which require additional evaluations and Non Relevant Indications which do not require further evaluations. The following definitions and indication codes were applied during the 1986 examinations.
RELEVANT INDICATIONS i
Any evidence of through wall penetration 120% through wall in the .540" H.G.S.D. examination is considered a relevant indication, pending confirmation 4
by the 8x1 absolute exam.
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t 5 TDR 781
" REVISION 1 PAGE 10 of 50 The S/N (signal to noise) code represents a potentially relevant signal, pending confirmation by the 8xl absolute exam. This is a low amplitude
(<1 volt) signal which has a poor signal to noise ratto (<3:1) and cannot be accurately evaluated for percent through wall depth. Tubes with these signals
- are examined by the 8xl absolute technique and are dispositioned on a case by case basis.
J The DTS code is a distorted tube support or distorted tube sheet indication. Distortion of the support signal may be caused by a number of different influences including the presence of a defect. This is a relevant signal if confirmed by the 8xl absolute exam. Tubes with indications in this area were removed from service following the outage SM examinations.
The ADR code represents absolute drift. Read from the 200 kHZ absolute j
i channel, it is an indication of wall thickness change. The 8x1 absolute channel is read for confirmation and circumferential extent. This signal may be from local wear or manufactured variation in wall thickness.
The PD code is used to identify possible defects. This code is assigned to identify signals for additional evaluations such as 8x1 absolute to t
determine if they are relevant or non-relevant.
INDICATIONS REQUIRING NO FURTHER EVALUATION The iqs code represents ID chatter. ID chatter refers to an uneven tube wall which is the result of the manufacturing process.
1 1420x qa
t 1 TDR 781 REVISION 1 PAGE 11 of 50 The PVN code shows a permeability variation. These variations may be mistaken for ID degradation. GPUN has largely eliminated this indication by using saturation probes which incorporate small magnets to reduce the effects of changes in the magnetic properties of the tube.
A DNG code identifies minor dings or dents in the free span of the l
tube. Most dings have been produced during tube manufacture or installation.
The DSS code is used to identify irregular support signals that do not show a defect indication. These signals are recorded for future information only.
NDD stands for No Detectable Defects, this code indicates no relevant or non-relevant Indications are present in the tube.
L I
l Indication locations The locations of the ECT indications are recorded to identify their
" elevation" or " axial location" in the OTSGs. The locations are recorded in inches, either above "+" or below " " the tubesheet surfaces or tube support plate. The relative locations of the tube sheets and tube support plates (T.S.P) are shown in Figure #1.
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4 1 TDR 781 REV!STON 1 PAGE 12 of 50 FIGURE 1 OTSG Longitudinal Section PRIMARY FACE b UPPER TUBE 3HEET (UT3)
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, s TDR 781 REVISION 1 PAGE 13 of 50
- IV. EXAMINATION CATEGORY AND RESULTS This section details the various categories of tubes which were examined during outage SM. The categories are separated into 3 major groups:
A. Examinations Required by Technical Specification 4.19 B. Examinations Required by Topical Report TR-008 C. GPUN Elective Examinations 1
Some tubes may be included in more than one examination category. In those l cases the tube is included in the first category discussed.
A. EXAMINATIONS REQUIRED BY T.S. 4.19 f
- 1. ISI TUBES Examination Category A.I.
SCOPE i
l i
In OTSG "A", 266 ISI tubes were examined.
In OTSG "B", 44 ISI tubes were examined.
INCLUDED TUBES The set of ISI tubes consists of two subsets, one of which (" Degraded I
i Tubes") is required to be examined by T.S. 4.19. Degraded tubes are defined as those tubes having previously identlfled degradation of 1 0% 2 through wall. ,
This includes tubes with .540" H.G.S.D. Indications 120% in 1984 data, which I
were confirmed by the 8x1 absolute exam.
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O l TDR 781 -
REVISION 1 PAGE 14 of _q0 In order to track all tubes with any evidence of degradation, GPUN elected to include confirmed indications of <20% through wall in this examination category. For this examination the set of ISI tubes consists of all tubes, evaluated in 1984 to have any confirmed evidence of degradation,
! which were not plugged subsequent to the 1984 examination. This includes both 1
inner diameter and outer diameter indications.
l These tubes are identified in TR-008, Table A-1, Category la.
- PURPOSE OF EXAMINATION Examination of the ISI tubes is done for two reasons. First, new i examination results are compared to the results of previous examinations to l
determine if there is evidence of an active degradation mechanism occurring in the OTSGs. Second, the examination provides assurance that no tubes with indications exceeding the plugging criteria remain in service.
I DATA RECORDING ,
The evaluated results of the 540 HGSO examination of the ISI tubes are recorded in Data Set 1.0. Companion 8x1 absolute exam results are recorded in
. Data Set 3.0. The relevant examination results for these tubes are contained in the Appendices and are identified as Exam. Cat. A.I.
1420x qa j
i 9
, - - - , --- -r, , - - ~ , - - , . , , , , , , - , , , - - - - - - - . . , , - , - , m - . e . _ ---n -- , , - , , - - - gv--,,, - ---
, i TDR 781 REVISION 1 PAGE 15 of 50 RESULTS The results of the 1986 examinations of the ISI tubes were consistent i
with the 1984 results. The majority of the indications previously identified in 1984 were confirmed and showed no evidence of change from 1984 to 1986. Ia some cases, discrepancies in the percent through wall evaluations, indication elevations, and number of indications reported were identified. These j discrepancies were resolved through . tube by tube comparisons of the 1984 and 1986 data. With the resolution of these discrepancies, GPUN was able to conclude that the examination did not reveal any ongoing degradation of existing Indications from 1984 to 1986.
The results of the examinations did require a total of six (6) of the l
310 tubes (1 in OTSG A, 5 in OTSG B) to be removed from service. Two (2) tubes in OTSG 8, 8-94-3 and 8-103-5 were plugged because of indications 1 0% 5 T.W. in the upper tube sheet region. A review of the 1984 data showed the indications had previously been undercalled in 1984 and had not changed from 1984 to 1986.
Four tubes A-104-123, 6-43-10, 8-89-5 and 8-94-4 were plugged because of possible defects at the entrance to the upper tube sheet. These Indications were distorted signals (DTS) and the tubes were preventatively plugged. A more complete evaluation of these tubes is given in Section V of this report.
t i
The detalls of the data reviews are shown in Appendix II.
i i
1420x qa l
i
a 6 TDR 781 REVISION 1 PAGE 16 of 50 EVALUATION OF 1984 AND 1986 INDICATIONS Most 1984 Indications in the ISI tubes were vertfled in 1986, some were re-evaluated as non-relevant indicaticns. Since the phase angle of an indication from a shallow discontinuity is very close to the phase angle of an indication from a surface irregularity, they are difficult to separate.
However, the time of signal formation (rise time) is slower for the surface irregularity, which allows an experienced data analyst to classify the indication as non-relevant. Therefore, some indications previously identified as degradation in 1984 were re-evaluated in 1986 as 10 chatter (IDC) which l
l Indicates a variation in the inner diameter of the tube wall and not a degraded condition.
In some cases, new Indications seemed to have appeared in the 1986 data. However, a review of the 1984 tapes showed that, in all cases, the indication was present. The indications were not previously reported because of several reasons. They were either difficult to separate from the i
background noise, recorded at the improper elevation or, in the case of multiple indications, not evaluated on an individual basis.
Some 1984 Indications were not reported in 1986. Review of the tapes (1984 or 1986 as applicable) showed the discrepancies were the result of differences in the reported locations or the 1984 indications were determined to be non-relevant. The complete results of these evaluations are shown in Appendix III.
j 1420x qa
a s TDR 781 REVISION 1 PAGE 17 of 50 STATISTICAL EVALUATION OF I.D. IN0! CATIONS To check for evidence of continuing inner diameter Initiated tube wall degradation, a group of indications in the degraded tubes was checked for change between 1964 and 1986. The indications used were I.D. Indications evaluated at 120% T.H. In both 1984 and 1986, and confirmed by the 8xl 2
absolute examination in 1984 or 1986. See Table I and 2 and Appendix III.
In "A" OTSG, 139 indications met the above criteria. The average change in each indication was -3.1% of wall thickness between 1984 and 1986 (sample standard deviation 6.0% of wall). The amplitude of these indications showed a mean change of .1 volts (sample standard deviation .2 volts).
l In "B" OTSG, 13 indications met the criteria. The average change in l each indication was +2.2% of wall thickness between 1984 and 1986 (sample standard deviation 4.1% of wall). The amplitude of these indications showed a mean change of .7 volts (sample standard deviation .5 volts).
When combined, the average change per indication for both OTSG's was
-2.6% of wall (sample standard deviation 6.1% of wall). The mean amplitude )
l change was .2 volts (sample standard deviation .3 volts). These changes are l well within the degree of precision for this process and support the conclusion that there is no ongoing degradation.
l 1420: qa
TDR 781 REVISION 1
- No. of Tubes No. of 1984 Indications OTSG A OTSG B TOTAL OTSG A OTSG B TOTAL 266 44 310 513 73 586 ISI Population l
10 114 139 13 152 l
Included in Statistical 104 Evaluation (1) 162 34 196 374 60 434 Excluded from Statistical Evaluation (2) .
(1) Indications included in statistical evaluation contain only tubes with I.D. Indications 220 TW in both 1984 and 1986 and confirmed in either 1984 or 1986.
(2) Basis for excluding indication 5 10 A) 0.D. Origin 138 32 B) <201 TW in 1984 58 0 C) <201 TW in 1986 68 4 D) tow signal / noise ratio in 1986 8 1 E) 1.D. chatter in 1986 11 2 F) Multiple Indications G) Not confirmed by 8ul - in both 1984 and 1986 86 11 374 60
- This data based on tubes included in Appendix III. 1420x qa
.(
TDR 781
- REVISION 1 PAGE _19 of 50 TABLE 2 STATISTICAL EVALUATION OF DEGRADED TU8ES No. Inds No. Inds No. Inds Mean' Std 1 T.W. 1 T.W. 1 T.W. Change Deviation Increased Decreased Unchanged 1 T.H. 1 T.W.
Number 84-86 84-86 84-86 84-06 84-86 OTSG Indications 33 96 10 -3.0 6.1 l A 139 6 3 4 +2.2 4.1 8 13 39 99 14 -2.6 6.1 Both 152 A&B ho. Inds No. Inds No. Inds Mean Std Volts Volts Volts Change Deviation Increased Decreased Unchanged Volts Volts 84-86 d4-86 84-86 84-86 84-86 27 85 27 .1 .2 A 139 0 13 0 .7 .5 8 13 27 98 27 .2 .3 Both 152 A&B 1420x qa
TDR 781 REVISION 1 PAGE 20 of _10
- 2. 3% RANDON SAMPLE TU8ES l
Examination Category A.2. f SCOPE In OTSG "A", 479 tubes were examined.
In OTSG "B", 483 tubes were examined.
- INCLUDED TUBES I
i
- 3% of the tubes remaining in service in each OTSG are required to be examined according to T.S. 4.19. At least 50% of these tubes were selected l
from the high defect density area (periphery) of the OTSG. This area is defined to include all tubes outside the radius of the outer support rod circle. The remainder of the 3% sample was selected throughout the tube bundle. Note: The srtple did not include degraded tubes which were all examined. The number of tubes included >3% of the 15,531 tubes in each OTSG in addition to the degraded tubes.
i J
These tubes are identifled in TR-008. Table A-1, Category 2.
REASON FOR EXAMINATION i
The tubes in this sample have no history of degradation below the kinetic expansion. They are examined to determine if any degradation has t
occurred since the last examination.
i' 1420x qa 9
TDR 781 REVISION 1 PAGE 21 of 50
,' DATA RECORDING The data from the 540 H.G.S.D. examination of tubes in the peripheral (high defect density) area of the OTSG's is reported in Data Set 4.1. Data from the remainder of the 3% sample tubes is reported in Data Set 4.2. The 8xl absolute data for indication confirmation is reported in Data Set 3.0.
The relevant examination results for these tubes are contained in the Appendices and are identified as Exam. Cat. A.2..
RESULTS In OTSG A no relevant indications 120% through wall were detected in 477 of the 479 tubes examined. One (1) tube, A-63-129, had multiple inner diameter indications >20% T.W. and <50% T.W. reported in the upper tube sheet and will be plac'id in the degraded tube population for the next examination.
One (1) tube A-94.126 had an indication >50% through wall in the upper tube sheet and was removed from service.
1 The 1984 data was reviewed for each of these tubes to determine if the indications had been present. In both cases the review showed the indications had been present but were not reported during previous examinations and did not show any continued degradation from 1984 to 1986.
1420x qa
. o TOR 781 REVISION 1 PAGE 22 of 50 In OTSG 8, no relevant indications 120% through wall were detected in 480 of the 483 tubes examined. Three (3) tubes had indications 120% T.W. and
<50% T.H. and will be placed in the degraded tube population for the next examination. Two (2) of these tubes B-30-68 and B-68-80 had indications below the upper tube sheet and one (1) tube B-104-77 had indications in the upper tube sheet. No tubes had indications which required their removal from service.
The 1982 baseline data was reviewed for each of these tubes. (Note: ;
Not all OTSG B tubes were examined in 1984.) The review showed that all of the indications had been present in 1982 but were not previously identified.
For tubes B-30-68 and B-68-80 no change was identified from 1982 to 1986. For tube B-104-77, the amplitude of the signal increased from 1982 to 1986 while the percent through wall remained constant.
Refer to Appendix II for the detailed results of the data review.
1 l
l l
1420x qa l
TDR 781 REVISION 1
- PAGE 23 of _10
- 8. EXAMINATIONS REQUIRED BY TR-008
- 1. SAMPLE. TUBES ADJACENT TO PLUGGED TUBES Examination Category B.I.
SCOPE 4
i In OTSG A, 71 tubes were examined.
In OTSG B, 114 tubes were examined.
I INCLUDED TUBES Tubes in this category are located adjacent to plugged tubes which have not been stabilized at the elevation of their defect. The examination was required at specific elevations per TR-008, however, the entire length of tubing was examined as identified in Section III (Examination Extent) of this report. .
These tubes are identified in TR-008 Table A-1, Categories Ib c.g.
REASON FOR EXAMINATION Some concern exists that a plugged defective tube might shear at its
! defect location and damage adjacent tubes. To address this concern, a group of these " adjacent" tubes from both OTSG's have been selected for examination for evidence of wear from a failed tube end. i 4
1420x qa 1
TDR 781 REVISION 1 PAGE 24 of 50 DESCRIPTION OF NEAR Wear, if any, is assumed to be caused by contact with a sheared tube end and vibration caused by high cross flow. Some assumptions may be made about the geometry of the wear area.
Near from a sheared tube end would be confined to one side of the affected tube. Movement of the sheared tube end would be from side to side rather than up and down. Axial extent of the wear would be short compared to manufactured tube wall variations, but long compared to IGA pitting or IGSA cracking.
DATA RECORDING 2 The' data from the 200 kHZ 540 absolute and the 540 HGSO examinations is recorded in Data Set 2.0. The 8x1 absolute data is recorded in Data Set 3.0.
In Data Set 2.0, the tubes from categories ib, Ic, and lg (TR-008. Table A-1) are identifled under Heat No. as 2.B, 2.C, and 2.G. The relevant examination results for these tubes are contained in the Appendices and are identified as l
Exam. Cat. B.1.
RESULTS
! No tubes were found to have any indication of wear. Indications l
detected in the 200 kHZ 540 absolute examination are shown in the data as ADR (absolute drift). These indications are typically confirmed in the 8xl 1
! absolute data by four to eight coils and do not indicate a degraded 1420x qa
TOR 781 REVISION 1 PAGE 25 of 50 condition. This data indicates much greater circumferential extent than the expected wear geometry. These indications are scattered throughout the population of all examined tubes which indicates some normal variation in tube wall thickness, rather than local wear, as the source of the indication.
The examinations performed for other signs of degradation identified no indications which required the tube to be plugged. Three (3) tubes A-96-32, 8-146-37 and 8-150-25 did have indications of 120% and <50% T.W. reported and will be added to the degraded tube population. In all cases, the indications were inner diameter initiated and occurred below the upper tube sheet.
The previous data was reviewed for tube 8-146-37. This review showed the indication had been present in 1982 but was not previously recorded. No changes were noted from 1982 to 1986.
The results of the data review are included in Appendix II.
- 2. SAMPLE. TUBES IN HIGH PLUG DENSITY AREA Examination Category B.2.
SCOPE In "A" 0TSG, 45 tubes were examined.
In "B" 0TSG, 56 tubes were examined.
1 1420x qa
TDR 781 REVISION 1 PAGE 26 of 50
'- INCLUDED TUBES Originally, during the 1983 post repair baseline, this category consisted of a selection of more than 50 tubes from the high plug density 1 areas of each OTSG. Plugging after the 1984 examination has reduced the sample size to 45 in OTSG "A" and 56 in OTSG "B".
These tubes are identified in TR-008, Table A-1, Category le.
REASON FOR EXAMINATION Since an area of the OTSG with a high density of plugged tubes may produce operating conditions that differ somewhat from normal (silghtly cooler, for instance), monitoring these areas for any degradation is desirable.
1 OATA RECORDING i
Data from the 540 HG50 examination is reported in Data Set 2.0. In this data set, these tubes are listed as Heat No. 2.E to identify them as Category
! le tubes from TR-008, Table A-1. Data from the 8x1 absolute exam is reported in Data Set 3.0. The relevant examination results for these tubes are contained in the Appendices and are identifled as Exam. Cat. B.2. i
\
l RESULTS No confirmed indications 120% through wall were identified in this i
examination category.
- 1420x ga f 1
TDR 781 REVISION I PAGE 27 of _}Q
- 3. KINETIC EXPANSION AREA IN0! CATIONS Examination Category B.3.
SCOPE In "A" OTSG, 10 tubes were examined.
In "B" OTSG, 19 tubes were examined.
1 INCLUDED TUBES 4
The 1983 8x1 absolute pre-service examination of these tubes disclosed indications in the 6" qualifying length of the kinette expansion. The indications were evaluated as acceptable and the tubes remained in service with the requirement that periodic in-service examination would be performed.
1 These tubes are identified in TR-008 Table A-1. Category Id.
I REASON FOR EXAMINATION 4
Examination of these tubes is conducted to assure that the indications i
I l
In the 6" qualtfled length remain within acceptable Ilmits. ;
I EXAMINATION Since the 540 HGS 0 exam is not effective at the kinette expansion transition and in the expanded zone, this area is examined using the 8x1 absolute probe. The area of interest is from the entrance of the upper tube l
Sheet through the 6" quellfying length.
- l. 1420x qa l
i , .
1 l
TDR 781 REVISION 1 PAGE 28 of _50 DATA RECORDING Data from the 8x1 absolute exam is reported in Data Set 10.0. These tubes are also included in several other categories, therefore no individual Heat No. was assigned to identify the data set. The relevant examination results for these tubes are contained in the Appendices and are identified as Exam. Cat. B.3.
RESULTS For No tubes were removed from service as a result of this examination.
27 of the 29 tubes, the indications were 1 or 2-coils in both 1983 and 1986 and in one (1) tube the 1983 indication was not detectable in 1986. In one (1) tube, B-112-5, a 3-coll indication was identified in 1986 in an area where two (2) 1-co11 indications had been identified in 1983. This indication was determined to be acceptable based on location. GPUN considers the 1986 results to be consistent with the 1983 results and therefore no additional evaluations were required.
1420x qa
l
- TOR 781 REVISION 1 ,
PAGE 29 of 50 ;
i
- 4. 3% SAMPLE. UPPER TUBE SHEET ONLY
. Examination Category B.4.
SCOPE In "A" OTSG, 447 tubes were examined.
In "B" OTSG, 502 tubes were examined.
INCLUDED TUBES In addition to the tubes with previously identified indications in the kinetic expansion zone (Examination Category B.4) above, TR-008 required the examination of the tubing from the upper tube sheet entrance through the 6" qualification length of 3% of the tubes remaining in service in each OTSG.
These tubes are identified in TR-008, Table A-1, Category if.
REASON FOR EXAMINATION The tubes in this sample have no history of degradation. They are examined to assure that no previously unidentified degradation mechanism is active in the kinetically expanded areas of the tubes.
] I EXAMINATION The 8xl absolute probe was used to examine the length of tubing from the 4
bottom of the upper tube sheet to the top of the 6" quallfled expansion length.
1420x qa 4
. - . - ,-- yc 7.--, - - - - , ,- ,. -_, -y , _ .., _ . , - -
TDR 781 REVISION 1 PAGE 30 of _50 DATA RECORDING Data from the 8xl absolute examination is recorded in Data Set 10.0.
These tubes are listed as Heat No. 10.F to identify them as category if tubes l from TR-008, Table A-1. The relevant examination results for these tubes are contained in the Appendices and are identified as Exam. Cat. B.4.
RESULTS Of the 447 tubes examined in OTSG A, one (1) tube, A-49-99, was removed l
from service due to a 1-coil indication. This indication was .1" below the kinetic expansion and the percent through wall penetration could not be determined. The tube was therefore preventatively plugged. Nine (9) other tubes had 1 or 2-coll indications reported within the area of interest.
Of the 502 tubes examined in OTSG B, one (1) tube, B-98-84, was removed i
from service because of a 2-coil indication at the kinetic expansion transition. This tube was preventatively plugged because the percent through wall penetration could not be determined. In addition, seven (7) other tubes had I or 2-coll indications reported in the area of interest and one (1) tube had a 3-co11 indication.
For the two (2) tubes removed from service the 1983 post kinetic expansion baseline data was reviewed. This review showed no detectable indications. Since the remaining indications were consistent with the 1983 examination results, no additional reviews were performed.
1420x qa
TOR 781 REVISION 1 PAGE 31 of 50 C. GPUN ELECTIVE EXAMINATIONS
- 1. TU8ES WITH INDICATIONS NOT CONFIRMED BY 8xl ABSOLUTE EXAM IN 1984 Examination Category C.I.
SCOPE In OTSG "A", 228 tubes were examined.
In OTSG "B", 50 tubes were examined.
INCLUDED TUBES i
l All tubes which had 540 H.G.S.D. Indications in the 1984 examination but which were not confirmed by the 8xl absolute exam, were included in this category.
REASON FOR EXAMINATION i
I These tubes were examined to provide an additional level of confidence that the indications are non-relevant.
DATA RECORDING l l
The data from the 540 HGSD exam is reported in Data Set 1.1. The 8xl absolute data is reported in Data Set 3.0. The relevant examination results for these tubes are in the Appendices and are identified as Exam. Cat. C.I.
1420x qa
TDR 781 REVISION 1 PAGE 32 of _50 RESULTS In OTSG A, the indications in 203 of the 228 tubes continued to appear as non-relevant. The evaluations of the 25 remaining tubes snowed the indications were relevant indications and the tubes were dispositioned as follows:
Three (3) tubes (A-2-8, A-54-2, A-104-27) were determined to have relevant, inner diameter initiated indications 150% T.W. and the tubes were removed from service. The indications were located between the 14th T.S.P. and the kinetic expansion and were limited to 1-coll in all cases.
One (1) tube, A-77-6, was determined to have a relevant, inner diameter initiated, 1-co11 indication 1 0%
2 through wall in the freespan above the 15th T.S.P. This tube is located along the inspection lane and was therefore removed from service.
One (1) tube A-14-75, was preventatively plugged due to a 2-coil indication above the third tube support plate. This indication had a poor signal to noise ratto on the .540" H.G.S.O. examination and the percent through wall could not be determined.
Twenty (20) tubes had inner diameter indications 120% and <50% through wall which were determined to be relevant indications. The indications in all of these tubes were limited to 1-coll. These tubes will be treated as degraded tubes during future examinations. ,
1420x qa
TDR 781 REVISION 1 PAGE 33 of 50 In OTSG B, the indications in 48 of the 50 tubes were confirmed as non-relevant indications. The other two (2) tubes had indications which were determined to be relevant and were dispositioned as follows.
Two (2) tubes had 1-coil indications >20% and <50% through wall and will be treated as degraded tubes during future examinations.
To determine if the newly confirmed indications had changed from 1984 to .
1 1986, GPUN reviewed the 1984 data for the five (5) tubes which were plugged.
This review showed no apparent change in the .540" H.G.S.D. Indications from 1984 to 1986 for any of the five (5) tubes. A review of the 1984 8xl data for four (4) tubes showed that indications in two (2) tubes A-2-8 and A-54-2 had been present but were not previously recorded and for two (2) tubes, A-77-6 and A-104-27, no indications could be identified during the review. For tube A-14-75 no previous 8xl data was available for the area of interest. These results are consistent with the results of previous evaluations and therefore do not indicate continuing degradation.
The details of these evaluations are shown in Appendix II.
l l
1420x qa
TDR 781 REVISION 1 PAGE 34 of 50
- 2. LANE / WEDGE AREA TUBES Examination Category C.2.
SCOPE In "A" OTSG, 417 tubes were examined.
In "B" OTSG, 473 tubes were examined.
/
INCLUDED TUBES The initial scope included all tubes in the Lane and Wedge area. The tubes in the 3 rows on each side of the tube lane, Rows 73, 74, 75, 77, 78, and 79, from Tube I to the center of the OTSG, are the lane tubes. The tubes in the wedge formed by drawing a line from Row 66 Tube i to Row 75 Tube 15 and from Row 86 Tube 1 to Row 77 Tube 15 are the wedge tubes.
Following the detection of indications in the initial sample, the scope of the examination in OTSG B was expanded to include an additional 46 tubes in l rows 71, 72, 80 and 81. These tubes were examined to assure the degradation was not present outside the lane area.
REASON FOR EXAMINATION OTSG's have typically experienced degradation in the lane / wedge tubes.
In consideration of the possibility of accelerated degradation in this area, GPUN elected to examine all of the lane / wedge tubes independent of the Tech.
1420x qa
TDR 781 REVISION 1 PAGE 35 of _50 Spec. random sample. Note: Two tubes in the wedge area of each OTSG, "A" Row 71 Tubes 6 and 7 and "B" Row 71 Tubes 6 and 7, were inadvertently not examined. Since no degradation was identified in the tubes adjacent to these tubes the results of the examination are not affected.
DATA RECORDING The data from th'e 540 HGSD examination is reported in Data Set 6.0. The confirming 8xl absolute data is reported in Data Set 3.0. The relevant examination results for these tubes are included in the Appendices and are identified as Exam Cat. C.2.
RESULTS In OTSG A, three (3) of the 417 tubes examined had inner diameter indications which required them to be dispositioned as follows:
One (1) tube, A-74-31, had multiple inner diameter indications in the upper tube sheet which exceeded 50% through wall. This tube was removed from service.
Two (2) tubes, A-74-28 and A-78-31, had inner diameter indications 120%
and (50% through wall in the upper tube sheet. These tubes will be
~
treated as degraded tubes during future examinat1ons.
1420x qa o
TDR 781 REVISION 1 PAGE 36 of 50 A review of the 1984 data was performed to determine if the indications had changed from 1984 to 1986. This review showed no change in the ECT signals for any of the three (3 ) tubes.
In OTSG B, eleven (11) of the 473 tubes examined had indications which required them to be dispositioned. Nine (9) tubes were plugged and two (2) ,
tubes will be treatvU as degraded tubes during future examinations. The breakdown of this disposition is as follows. ,
1 One (1) tube, B-73-1, was removed from service due to a 1-co11 indication 120% and <50% T.W. located above the 15th T.S.P. A review of the 1984 data for this tube revealed the indication had been present and there was no change from 1984 to 1986.
One (1) tube, B-77-18, was removed from service due to indications 150%
through wall above the 15th T.S.P. This tube had two (2) 2-coll and one (1) 1-co11 Indications reported. A review of the 1982 data showed no apparent change in the indications from 1982 to 1986.
Five (5) tubes had inner diameter indications 150% through wall in the
. upper tube sheet. These tubes, B-77-57, B-78-18, B-78-20, B-78-57 and B-79-57, were removed from service. A review of the previous data, 1982 and 1984, showed a definite change in the amplitude and signal to noise ratio of the indications as compared to the 1986 data. The poor signal l
l to noise of the 1982 and 1984 data prevents making accurate determinations of the percent through wall values.
I 1420x qa
TOR 781 REVISION 1 PAGE 37 of 50 Two (2) tubes, 8-77-14 and B-79-8, had indications at the entrance to the upper tube sheet and were removed from service. The indication in B-77-14 was determined to be near through wall while the indication in 8-79-8 could not be evaluated for percent through wall. The evaluation of these two (2) tubes and the review of the previous data are discussed in detail in Section V of this report.
Two (2) tubes, B-73-18 and B-74-18, had indications 120% and <50%
through wall reported in the upper tube sheet. These indications were both inner diameter initiated. The tubes will be treated as degraded tubes during future examinations. A review of the 1982 data for these tubes showed the indication amplitude and signal to noise ratio improved from 1982 to 1986 making them more detectable. The poor signal to noise ratio of the 1982 indications prohibits making percent through wall comparisons between 1982 and 1986.
The details of the data reviews are contained in Appendix II.
1 1 1
1 1420x ga
TOR 781 REVISION 1 PAGE 38 of 50
- 3. GAP TUBES Examination Category C.3.
SCOPE In "A" OTSG, 7 tubes were examined.
In "B" OTSG, 10 tubes were examined.
INCLUDED TUBES In some tubes the intergranular attack at the mechanical roll (expansion) transition, about 1 1/2" from the tube end in the upper tube sheet, caused 360' cracking in November 1981. Since the tubes are in tension when cold, this crack allowed these tubes to separate and created a gap.
REASON FOR EXAMINATION .
Since the gap in the tube wall exposes the carbon steel tube sheet to primary coolant (a buffered solution of boric acid), a sample of these tubes is being monitored for any sign of degradation. (Including constricted tubing.)
DATA RECORDING The data from the 540 HGSD exam is reported in Data Set 11.0. Any 8xl absolute data for these tubes would appear in Data Set 3.0. The relevant 1420x qa q,. s , n, ,-m - ,, -,, -- , , w
TDR 781 REVISION 1 PAGE 39 of J examination results for these tubes are included in the Appendices and are identified as Exam. Cat. C.3.
RESULTS No confirmed indications 12 0% through wall were identified in either the portion of tubing below or inside the tubesheet.
1 1420x qa
- . , -- - . - . - -- . , _ -+
TDR 781 REVISION 1 PAGE 40 of _50
- 4. SPECIAL CATEGORY TUBES Examination Category C.4.
SCOPE One tube was examined in "A" OTSG, Row 20 Tube 6.
One tube was examined in "B" OTSG, Row 99 Tube 5.
INCLUDED TUBES A 540 H.G.S.D. eddy current probe became lodged in the tube in "A" OTSG and could not be removed.
i The "B" OTSG tube was inadvertently plugged in the lower tube sheet following the 1984 ECT examinations.
REASON FOR EXAMINATION Since the top of the "B" OTSG tube is open, it is full of primary coolant. It is being examined to ensure that degradation does not initiate under the condition of zero flow.
I
(
l 1420x qa
TDR 781 REVISION 1 PAGE 41 of _50 EXAMINATION j
The 540 HGSD examination was conducted through the full length of the "B" OTSG tube to detect any degradation. Any indications would then have been subject to 8xl absolute examination for confirmation. The OTSG "A" tube was examined from the stuck probe to the kinetic expansion to permit dispositioning the tube.
DATA RECORDING J
The data for the OTSG "B" tube is reported in Data Set 11.1. The data for the OTSG "A" tube is recorded on tape number 1000. The relevant examination results for these tubes are included in the Appendices under Exam.
Cat. C.4.
RESULTS No indications >20% T.W. were found in these tubes.
The "A" tube was plugged to prevent the probe head from moving out of ,
l the OTSG during plant operation.
The status of the "B" tube was not changed.
1420x qa
_. ._ _ _ . _ . =
l TDR 781 l REVISION 1 PAGE 42 of _50 V. DISCUSSION OF RESULTS Characterization of Indications The indications reported during 1986 were characterized by location, percent through wall, amplitude, and circumferential extent. This characterization showed that the indications are inner diameter initiated and are located towards the top and the outer periphery of the OTSGs. This is the same distribution of indications as identified during both the 1982 and 1984 examinations.
The amplitudes (voltage) of the 1986 indications were typically small The
(<2 volts) which is also consistent with both the 1982 and 1984 results.
characterization by percent through wall shows most of the indications are partial through wall with only four (4) tubes having indications >90% through wall (all in the upper tube sheet). This is consistent with the 1984 examination results in which only 2% of the indications were >90% through wall. By contrast, approximately 40% of the 1982 indications were >90%
through wall.
The circumferential extent of the 1986 indications was typically 1 or 2 coils with no indications which exceed 3-coils. This is consistent with the 1984 examination results and showed a decrease from the circumferential extent of the 1982 indications.
To further characterize the 1986 indications by axial location the tubes which were removed from service are shown on Table 3 and are discussed in the following sections.
1420x qa l
TDR 781 REVISION 1 PAGE 43 of 50 TABLE 3 TUBES REMOVED FROM SERVICE Indication Percent Through Nail
<501 T.W. >501 T.W. % T.N. Indeterminate Cat.* 1 Colls Tube I.DT Cat.* 1 Colls Tube I.D. Cat.* 1 Colts Tube I.D.
i A-2-8 C.I. 73 1 A-14-75 C.I. S/N 2 I Free A-77-6 C.I. 36 N Span B-73-1 C.2. 33 1 A-54-2 C.I. 63 1 D B-77-18 C.2. 66 2 I
C B-98-84 B.4. N/A 2 A Upper A-74-31 C.2. 97 1 A-94-126 A.2. 74 1 A-49-99 B.4. N/A I T Tube I Sheet A-104-27 C.I. 70 1 B-78-18 C.2. 99 3 0 C.2. 93 2 N
B-79-57 B-77-57 C.2. 63 2 B-78-20 C.2. 66 2 B-78-57 C.2 56 2 l 1
B-94-3 A.I. 50 2 L
0 B-103-5 A.I. 56 2 l l
C A A-104-123 A.1. DTS 2 T Upper B-77-14 C.2. 97 3 B-43-10 A.I. DTS 1 I Tube B-79-8 C.2. DTS 1 0 Sheet B-89-5 A.I. DTS 1 N Entry B-94-4 A.I. DTS 1
- Exam. Cat. denotes section of report in which detailed reviews are discussed.
NOTE: Tube A-20-6 was plugged due to a stuck probe and does not appear on this table.
1420x qa
TDR 781 REVISION 1 PAGE 44 of _50 s Evaluation of Freescan Indications Six (6) tubes, fcer (4) in O!SG A asd two (2) in OTEG 0, vere p!uggad dee to indications in the freespan (between the tubesheets) portion of the tubes.
In all cases the Indications appear inner diameter initiated and were limited to 1 or 2 coils in circumferential extent. The indications in five (5) of the tubes were located above the 14th T.S.P. and one (1) was between the 3rd and 4th T.S.P.
Two (2) of the tubes were located in the lane / wedge region and were plugged for <40% through wall indications above the 15th T.S.P. In both cases the indications were 1 coil on 8x1.
Three (3) of the tubes had indications 150% through wall. Two were 1-coll indications and the other was a 2-coli indication by 8x1.
The indication in the sixth tube had a poor signal to noise ratio and was
<1 volt in amplitude and could not be evaluated to determine the percent through wall penetration. This tube was conservatively plugged for the corresponding 2-coli indication on 8x1.
A review of the previous data for these six tubes showed no change when compared to the 1986 data. These tubes are identified in Table 3 and are discussed in more detail in the individual examination categories in which j
they were examined. . ,
1420x qa
- O TDR 781 REVISION 1 PAGE 45 of _50 Evaluation of Tube Sheet Indications Twelve (12) tubes, four ;4) in GTSG A and eight (6; in OT5G C. wers' plugged due to indications which were reported from above the secondary face of the upper tube sheet up to and including the transition to the kinetically expanded region.
The indications in eleven (11) of the tubes were 1 or 2-coils while
.one (1) tube was plugged due to a 3-coll indication. The percent through wall penetration of these indications ranged from 50-99%.
A review of the previous data showed most of the indications had been present during the previous examinations. A comparison of the previous data to the 1986 data showed no change in the ECT signals for about half of the indications reviewed. The ECT signals in the remaining tubes showed an increase in the amplitude and signal to noise ratio of the indications since the last examination. This type of change in the ECT signals was also identified during the 1984 examinations and is discussed in detall in TOR 652. (Reference 6) 1420x qa
, .-- _ _ . I , _ _
r TDR 781 REVISION 1 PAGE 46 of _50
- Evaluation of Indications at the Tube Sheet Entry 513 (6) tebes were rencved from service, ore (1) In OT5G A and five (S)
In in OTSG B, because of indications at the entrance to the upper tube sheet.
five (5) of the tubes the indications were distorted signals and no percent through wall determinations could be made. The other indication was determined to be near through wall (97%). The indications were confirmed by the 8xl absolute and had circumferential extents of 1, 2, and 3 coils. .
The indications occur at the entrance to the upper tube sheet. This area has previously been identified by GPUN as an area of reduced eddy current capabilities using the .540" H.G.S.D technique. The reduced capabilities in this area are caused by " saturation" of the ECT instrument which prevents
" mixing out" the tubesheet entry signal using multi-frequency techniques.
During normal This " saturation" is discussed in TOR 423 (Reference 3).
examinations, the gain of the ECT system would be reduced to eliminate the
" saturation" and permit frequency mixing to eliminate the tube sheet entry i
signal.
During the 1986 examinations this limitation is combined with an i apparent change in the tube diameter which produces interfering signals and Note: The diameter change prevents mixing out the tubesheet entry signals.
is minor in nature as the .540" diameter probe is not restricted.
' . 1420x qa l
l
TOR 781 REVISION 1 PAGE 47 of _50
.~
These combined limitations prevent GPUN from using conventional ECT techniques (phase analysis) to determine both the origin, 0.0. versus I.D. and However, the the percent through will p9netration of the degradation.
technique can be used to identify distorted entry signals for additicnal examinations.
The method used to screen the 1986 indications was to record all distorted tubesheet entry signals (.540 H.G.S.0) and retest the tubes using the 8xl absolute probe which is not affected as strongly by the tube sheet entry. This method identified the distorted tube sheet entry signals in five (5) of the six (6) tubes (B-77-14, B-43-10, B-79-8, B-89-5, and B-94 4) which were plugged. Ten (10) other tubes, eight (8) in OTSG A and two (2) in OTSG B, had DTS indications and were screened for examination by the 8x1 absolute probe. The indications in these tubes were determined to be non-relevant.
In one (1) tube, A-104-123, no apparent distortion of the tubesheet entry was identified during the .540 H.G.S.0 examination however the 8xl examination showed a 2-coli indication at the tube sheet entry. To determine if this situation was present in other tubes GPUN reviewed the results of the 8xl examination of the upper tube sheets (Exam. Cats. B.3 and B.4). This review showed no other indications at the tubesheet entry for the 979 tubes examined.
Of the sixteen (16) tubes evaluated for indications at the tube sheet entrance, thirteen (13) are in the lane / wedge area and the other three (3) are in the outer periphery of the OTSG. Although the origin of the indications 1420x qa l
, l
. ~
TOR 781 REVISION 1 PAGE 48 of _50 i
was indeterminate, five (5) of the tubes which were plugged had I.D. l indications within 3 inches of the tube sheet entry. These indications ranged from 26-46% through wall and were 1 and 2 coils in circumferential extent.
l For the six (6) tubes which were plugged, GPUN reviewed the previous ECT data. This review showed the ECT indications had remained unchanged in three (3) tubes (B-43-10, B-89-5, B-94-4) while change was identified in three (3) tubes (A-104-123, 8-77-14, 8-79-8). The combined effects of the tube sheet ,
entry, and the interfering signals which were previously discussed, prevent making exact determinations of the cause or degree of change in the condition of the tubes. More complete details of the data reviews are provided in Appendix II.
1420x qa
---u-,-,, , - , - - - - . - - - -
TDR 781 REVISION 1 PAGE 49 of _50 VI. CONCLUSIONS Based on the results of the 1986, outage SM, ECT examinations and data evaluations, GPUN was able to reach the following conclusions:
- 1) Based on the evaluation of the previously degraded tubes, there is no evidence of ongoing corrosion.
- 2) The examination of the 3% random sample showed no evidence of new degradation.
- 3) The examinations performed as a follow up to the 1982 repairs showed no evidence of wear type degradation and no adverse affects from the localized high plug density areas.
- 4) The results of the 8xl examination of the upper tube sheet and
. kinetic expansion region were consistent with the 1983 post expansion baseline results.
- 5) The lane / wedge area has a higher than average cccurrence of defects and GPUN will continue to monitor this area during the next examination.
- 6) The characterization of the indications and the reviews of the previous data show the 1986 examination results are consistent with the 1984 examination results.
1420x qa
TOR 781 REVISION 1 PAGE 50 of _50 VII. REFERENCES
- 1. GPUN Topical Report 008, Rev. 3, T. M. Moran, " Assessment of TMI-1 Plant Safety for Return to Service After Steam Generator Repair,"
August 19, 1983.
- 2. Appendix A to the TMI-1 Operating License, Amendment 116 Technical Specification 4.19, 04/18/86.
- 3. GPUN TOR 423, Rev. 1, R. Barley, J. Janiszewski, G. RhedricK, M.
Torborg, "Three Mile Island - Unit I OTSG Tubing Eddy Current Program Qualification," 03/15/84.
- 4. GPUN TOR 642, Rev. 2, M. Torborg, G. Rhedrick " Qualification of Conversion Curve for Inner Diameter Discontinuities," 10/31/85.
- 5. Three Mile Island Nuclear Station Unit No. 1 Surveillance Procedure 1300-48, Rev. 2, " Eddy Current Examination of OTSG," 03/2i/86.
- 6. GPUN TOR 652, Rev. 2, G. E. Rhedrick, M. T. Torborg, D. L. Langan,
" Evaluation of the 1984 Required Technical Specification Examination for the TMI-1 OTSG." 12/02/85.
1420x qa 1
9
TDR 781 REVISION 1 APPENDIX I PAGE 1 of 11 APPENDIX I ECT EXAMINATION DATA SUMMARIES TABLE OF CONTENTS Pages 2
LIST OF TUBES REMOVED FROM SERVICE (OTSG A) 3 LIST OF TUBES REMOVED FROM SERVICE (OTSG B)
TUBES TO BE ADDED TO THE DEGRADED 4-5 TUBE POPULATION (OTSG A) 6 TUBES TO BE ADDED TO THE DEGRADED TUBE POPULATION (OTSG B)
INDICATIONS IN THE KINETIC EXPANSION 7 ZONE (PREVIOUSLY UNDETECTED) OTSG A INDICATIONS IN THE KINETIC EXPANSION 8 ZONE (PREVIOUSLY UNDETECTED) OTSG B INDICATIONS IN THE KINETIC EXPANSION 9 i
ZONE (PREVIOUSLY DETECTED) OTSG A INDICATIONS IN THE KINETIC EXPANSION 10-11 ZONE (PREVIOUSLY DETECTED) OTSG B I
I 1426x qa I
TDR 781 REVISION 1 APPENDIX I PAGE 2 of 11 LIST OF TUBES REMOVED FROM SERVICE (OTSG A)
Tube I.D. Exam. ECT Results OTSG Row Tube Cat. .540 H.G.S.D. 8x1 Absolute Location Orialn % T.W. Volts # Coils volts Phase A 2- 8 C.1. 15+19.9 ID 73 1.3 1 .5 3 15+19.1 ID 26 .9 1 .2 1
' 15+18.6 ID 30 1.1 1 .2 2 15+08.4 ID 33 .8 1 .6 1 A 14- 75 C.I. 03+18.9 ID S/N .7 2 1.1 3 A 49- 99 B.4. US+06.9 ID N/A .7 1 1.0 2 A 54- 2 C.I. 14+07.9 ID 36 .9 1 .5 2 14+05.8 ID 63 .8 1 .4 1 14+03.3 ID 60 1.3 1 1.0 1 ID 1.3 4 1 A 74- 31 C.2. US+03.1 53 1 US+05.5 ID 97 1.4 1 .5 2 J A 77- 6 C.I. 15+12.9 ID 36 .9 I .6 1 A 94-126 A.2. US+01.7 ID 74 2.9 1 .9 1 A 104- 27 C.1. US+05.3 ID 33 1.9 1 .7 1 US+05.7 ID 70 1.3 1 1.2 1 A 104-123 A.I. US+00.0 - DTS - 2 4.4 4 US+00.5 - N/A - 2 2.3 2 US+01.2 10 46 1.6 2 1.6 1 15+42.3 ID 30 1.0 1 .6 1 NOTE: Tube A-20-6 was also removed from service but had no ECT indications.
1426x qa
TDR 781 REVISION 1 APPENDIX I
- PAGE 1 of 11 LIST OF TUBES REMOVED FROM SERVICE (OTSG B)
Tube I.D. Exam. ECT Results OTSG Row Tube Cat. .540 H.G.S.D. 8x1 Absolute Location Oriain % T.H. Volts # Coils Volts Phase B 43- 10 A.I. US+00.0 - DTS 2.2 1 2.5 2 US+00.4 ID 26 2.4 1 .8 1 15+41.5 ID 36 2.1 1 .8 1 B 73- 1 C.2. 15+03.9 ID 33 1.2 1 1.0 2 B 77- 14 C.2. US+00.0 - 97 3.6 3 3.1 2 US+02.8 ID 30 1.6 1 .9 2 B 77- 18 C.2. 15+44.6 10 66 3.4 2 4.5 2 15+44.3 ID 26 2.5 1 2.1 1 15+44.0 ID 60 2.1 2 2.0 1 B 77- 57 C.2. US+05.2 ID 63 1.7 2 2.0 2 B 78- 18 C.2. US+02.7 ID 99 1.6 3 3.3 2 8 78- 20 C.2. US+04.8 ID 66 2.2 2 2.1 1 B 78- 57 C.2. US+05.8 ID 30 1.7 2 1.7 1 US+06.2 ID 56 2.4 2 3.9 2 B 79- 8 C.2. US+00.0 - DTS 1.6 1 .8 2 8 79- 57 C.2. US+01.7 ID 93 2.4 2 1.3 1 1
B 89- 5 A.I. US+00.0 - DTS 4.5 1 3.6 2 15+45.8 ID 26 1.8 1 .8 i B 94- 3 A.I. 15+45.5 ID 26 .9 1 1.0 1 15+45.3 ID 30 1.8 1 1.3 1 US+00.4 ID 40 1.9 2 1.3 1 US+02.3 ID 40 2.1 2 1.7 2 US+05.3 ID 50 1.6 2 1.3 2 US+05.7 ID 40 2.4 2 1.9 2 US+06.8 ID 20 1.7 1 1.1 1 B 94- 4 A.I. US+00.0 - DTS 2.2 1 1.9 1 15+45.8 ID 36 1.6 1 1.4 1 B 98- 84 B.4. US+07.0 - N/A - 2 1.3 2 B 103- 5 A.1. US+ 5.8 ID 56 2.9 2 2.0 2 1426x qa
- -- , - - - -- - , - ~ - - . . . , , - , - - ,
TDR 781 REVISION 1 APPENDIX I PAGE 4 of 11 TUBES TO BE ADDED TO THE DEGRADED TUBE POPULATION (OTSG A)
Tube I.D. Exam. -
ECT Results OTSG Row Tube Cat. .540 H.G.S.D. Sul Absolute Location Origin 1. T.W. Volts # Colls Volts Phase A 5- 9 C.I. 15+39.7 ID 36 4.2 1 .7 1 A 8- 43 C.I. 15+23.5 ID 20 1.2 1 .5 1 A 23- 3 C.I. 15+31.0 ID 23 .9 1 .4 1 A 35- 83 C.I. 15+35.4 ID 46 1.4 1 .8 1 A 42- 2 C.I. 15+41.9 ID 46 1.2 1 .3 1 US+05.1 ID 23 .7 1 .2 1 US+05.9 ID 30 .7 1 .2 1 A 63-129 A.2. US+02.6 ID 40 1.5 1 .3 1 US+03.6 ID 33 1.2 1 .1 1 US+04.2 ID 36 1.1 1 .3 1 US+04.7 ID 46 1.3 2 .3 2 A 66- 1 C.I. 04+25.6 ID 30 2.5 1 .8 1 A 74- 28 C.2. US+05.5 ID 43 2.8 1 .4 1 A 74- 54 C.1. US+03.3 ID 36 1.3 1 .5 1 A 78- 31 C.2. US+05.7 ID 20 1.0 1 .6 1 A 81- 92 C.I. 15+41.7 ID 23 1.2 1 4 1 US+00.8 ID 20 1.0 1 .7 1 A 82- 32 C.I. US+06 1 ID 26 2.3 1 4 1 A 88- 78 C.1. 15+33.5 ID 23 1.1 1 .5 1 A 95-111 C.1. 15+40.0 ID 23 1.1 1 .3 1 A 96- 32 B.1. 15+37.3 ID 26 1.5 1 .6 2 A 99- 17 C.I. 15+32.6 ID 23 1.5 1 .5 1 A 101- 51 C.I. US+01.3 ID 26 1.2 1 .5 1 i US+04.0 ID 33 1.5 1 .4 1 US+04.9 ID 36 1.0 1 .7 1 A 104- 75 C.I. 15+39.1 ID 30 1.0 1 .4 1 A 114- 93 C.I. 15+40.6 ID 26 1.3 1 .3 1 1426x qa
TDR 781 REVISION 1 APPENDIX I
- PAGE 5 of _11 TUBES TO BE ADDED TO THE DEGRADED TUBE POPULATION (OTSG A) (CONTINUED)
Tube I.D. Exam. ECT Results OTSG Row Tube Cat. .540 H.G.S.O. 8x1 Absolute l
Location Ortain 1 T.N. Volts # Colls Volts Phase 115- 26 C.I. 15+25.4 ID 36 1.0 1 .6 1 A
A 115- 49 C.1. 06+30.3 ID 23 1.8 1 .5 1 C.1. 15+38.6 ID 20 1.7 1 .8 1 A 119-107 A 126- 97 C.I. 15+26.5 ID 23 1.1 1 .6 1 1.3 4 1 A 151- 12 C.I. 12+34.4 ID 36 1 i
t 4
1426x qa
1 , .
TDR 781 REVISION 1 APPENDIX I
~
PAGE 6 of 11 TUBES TO BE ADDED TO THE DEGRADED TUBE POPULATION (OTSG B)
Tube I.D. Exam. ECT Results OTSG Row Tube Cat. .540 H.G.S.O. 8x1 Absolute location Origin % T.W. Volts # Coils Volts Phase 30- 13 C.1. 15+44.7 ID 30 1.9 1 1.0 1 B
A.2. 14+12.8 ID 46 .9 1 .4 2 B 30- 68 A.2. 11+12.0 ID 23 1.0 1 1.1 1 6 68- 80 C.2. US+05.6 ID 43 2.9 1 1.1 1 B 73- 18 B 74- 18 C.2. US+06.4 ID 36 1.7 1 1.2 2 B 104- 77 A.2. US+04.3 ID 26 1.7 1 .4 1 B 105- 8 C.l. US+06.6 ID 26 1.2 1 .7 1 B.1. 12+07.0 26 .9 1 .5 i B 146- 37 10 B 150- 25 B.I. 07+30.8 ID 26 1.1 1 .3 1 1
1426x qa
- - - - - - - e--, , - - - , ,.g. , - - -- .- --- - , , . - , - , ---,--y, ,-g --
-c..
TDR 781 REVISION 1 APPENDIX I PAGE 7 of 11 INDICATIONS IN THE KINETIC EXPANSION ZONE (PREVIOUSLY UNDETECTED)*
OTSG A ECT Results Tube I.D. Kinetic Expansion (1) 8 x 1 Indications OTSG Row Tube Transition Elevation Elevation # Coils Volts Phase A 21- 79 US+02.0 US+07.5 1 1.9 1 A 49- 99(2) US+07.0 US+06.9 1 1.0 2 A 56-119 US+02.1 US+08.0 1 .7 1 A 56-124 US+07.0 US+13.0 2 .9 3 A 75- 38 US+07.1 US+12.1 1 .8 A 77-119 US+02.0 US+05.5 1 .9 1 A 77-123 US+07.0(N) US+02.1 1 .6 2 A 112- 40 US+06.9 US+12.9 1 .9 1 A 112- 46 US+07.2 US+12.4 1 .6 2 A 112-106 US+02.0 US+02.7 2 .9 3 Notes:
(1) The kinetic expansion transition elevation is determined through the ECT examination. (N) indicates the elevation was not {
measured but represents the nominal location.
(2) Tube was subsequently plugged.
- This table incluoes only indications reported during the 3%
sample tubesheet examinations (Exam. Cat. B.4). Indications i similar to these were identified during other 8x1 examinations and were dispositioned according to the acceptance criteria.
For the purpose of this examination the kinetic expansion zone '
includes the portion of tube from the secondary face of the U.T.S. up to and including 6 inches of expanded tube, 1426x qa s- _ - - -_ __.
TDR 781 REVISION 1 APPENDIX I PAGE 8 of 11 INDICATIONS IN THE KINETIC EXPANSION ZONE (PREVIOUSLY UNDETECTED)*
OTSG B ECT Results Tube I.D. Kinetic Expansion (1) 8 x 1 Indications OTSG Row Tube Transition Elevation Elevation # Colls Volts Phase B 21- 1 US+02.1 US+07.6 2 2.9 2 :
B 35- 8 US+02.2 US+07.5 2 10.3 3 8 35- 44 US+07.0 US+08.1 1 1.6 1 B 49- 19 US+07.2 US+12.4 2 1.8 2 8 63- 43 US+07.0 US+10.4 1 1.3 1 8 75- 44 US+06.9 US+07.6 1 1.0 1 B 84- 47 US+07.0 US+08.5 1 2.3 1 B 98- 84(2) US+07.0 US+07.0 2 1.3 2 B 112- 87 US+06.9 'US+11.9 3 1.0 2 Notes:
(1) The kinetic expansion transition elevation is determined through the ECT examination. (N) indicates the elevation was not measured but represents the nominal location.
(2) Tube was subsequently plugged.
This table includes only indications reported during the 3%
sample tubesheet examinations (Exam. Cat. B.4). Indications similar to these were identified during other 8x1 examinations and were dispositioned according to the acceptance criteria.
For the purpose of thir examination the kinetic expansion zone includes the portion.cf ' tube from the secondary face of the U.T.S. up to and 1n(1961 ig 6 inches of expanded tube.
1426x ga'
TDR 781 l REVISION 1 l APPENDIX I
. PAGE _9_ of 11 INDICATIONS IN THE KINETIC EXPANSION ZONE (PREVIOUSLY DETECTED DURING 1983 BASELINE)*
OTSG A 8 x 1 Indications Tube I.D. Kinetic Expansion (1) Indication 1983 1986 OTSG Row Tube Transition Elevation Location # Colls Volts Phase # Colts Volts Phase A 6- 43 US+07.0(N) US+03.5 1 1.0 1 2 1.6 2 US+06.2 1 .5 1 1 .6 1 A 21- 85 US+0"i.0 US+11.5 2 3.0 4 2 2.5 2 A 75- 26 US+07.0 US+12.8 1 1.0 3 1 1.0 2 A 75- 32 US+07.4 US+11.9 1 1.0 1 1 1.2 1 A 77-124 US+02.0(N) 15+45.3 2 <1.0 2 1 .8 1 US+00.0 1 <1.0 1 1 .8 1 A 98- 4 US+07.0 US+08.4 2 2.0 3 1 2.2 1 A 98- 10 US+07.0 US+11.8 1 .5 1 2 2.3 2 US+12.0 2 3.0 3 1 2.8 2 US+12.4 2 2.0 3 1 1.5 1 A 126- 3 US+07.0(N) US+11.0 1 <1.0 1 - NDO -
A 126- 90 US+07.0(N) US+05.0 1 <1.0 3 1 .7 1 A 140- 38 US+07.1 US+11.1 1 1.0 2 1 .8 2 Notes:
(1) The kinetic expansion transition elevation is determined through the ECT examination. (N) indicates the elevation was not measured but represents the nominal location.
(2) Tube was subsequently plugged.
For the purpose of this examination the kinetic expansion zone includes the portion of tube from the secondary face of the U.T.S. up to and including 6" of the expanded tube.
1426x qa
TOR 781 REVISION 1 APPENDIX I i PAGE 10 of _1_1, INDICATIONS IN THE KINETIC EXPANSION ZONE (PREVIOUSLY DETECTED DURING 1983 BASELINE)*
OTSG B 8 x 1 Indications Tube I.D. Kinetic Expansion (1) Indication 1983 1986 OTSG Row Tube Transition Elevation Location # Colls Volts Phase # Coils Volts Phase B 2- 21 US+07.2 US+12.6 2 1.0 2 1 1.6 1 B 2- 22 US+07.0 US+12.9 2 5.0 2 2 3.0 2 B 2- 25 US+07.0 US+07.2 1 2.0 2 2 1.9 2 B 3- 21 US+07.0 US+09.4 1 .5 2 1 1.0 1 B 3- 24 US+07.0 US+11.2 1 1.0 .1 - - -
US+12.2 1 3.0 3 2 4.2 2 B 3- 25 US+07.0 US+10.4 1 2.0 2 1 2.4 2 B 3- 27 US+07.1 US+09.0 2 5.0 4 2 7.8 3 US+09.8 2 5.0 3 2 5.6 2 B 4- 19 US+07.0 US+11.0 1 1.0 <1 1 .9 1 B 4- 30 US+07.0 US+12.1 1 3.0 2 1 2.1 2 B 7- 36 US+07.0 US+11.8 2 3.0 3 1 2.5 3 8 21- 13 .
US+07.0 US+11.6 1 1.0 1 2 1.8 1 B 49- 11 US+07.0 US+10.8 - - - 1 3.5 2 US+11.4 1 2.0 2 2 13.6 3 B 63- 14 US+07.0 US+09.7 2 1.5 2 1 1.7 2 B 75- 4 US+06.9 US+09.4 1 2.0 3 1 2.5 2 US+10.8 - - - 1 1.3 1 US+11.5 2 2.0 2 1 1.9 1 B 75- 18 US+07.1 US+10.0 2 1.5 3 1 2.1 2 B 84- 8 US+06.9 US+07.5 2 4.0 3 2 4.8 2 8 98- 4 US+07.0 US+10.9 2 3.0 2 2 3.0 2 US+12.9 2 3.0 3 2 3.1 2 l
1426x qa i
TDR 781 REVISION 1 APPENDIX I PAGE 11 of _11 INDICATIONS IN THE KINETIC EXPANSION ZONE (PREVIOUSLY DETECTED DURING 1983 BASELINE)* (CONTINUED)
OTSG B 8 x 1 Indications Tube I.D. Kinetic Expansion (1) Indicatlon 1983 1986 OTSG Row Tube Transition Elevation Location # Coils Volts Phase # Colls Volts Phase B 112- 5 US+07.0 US+11.2(3) 1 1.0 1 - - -
US+12.5 1 2.0 1 3 2.7 2 B 140- 3 US+06.9 US+12.3 2 3.0 2 1 4.6 2 Notes:
(1) The kinetic expansion transition elevation is determined through the ECT examination. (N) indicates the elevation was not measured but represents the nominal location.
(2) Tube was subsequently plugged.
(3) The discrepancy in the elevations is attributed te limitations in the 1983 evaluation process.
For the purpose of this examination the kinetic expansion zone includes the portion of tube from the secondary face of the U.T.S. up to and including 6" of the expanded tube, i
1426x qa
l l
TDR 781 REVISION 1 APPENDIX II PAGE 1 of 20 APPENDIX II REVIEW OF PREVIOUS ECT DATA TABLE OF CONTENTS PAGE NO.
OVERVIEW 2-3 EXAMINATION CATEGORY A.1 4-5 EXAMINATION CATEGORY A.2 6-7 EXAMINATION CATEGORY B.1 8 EXAMINATION CATEGORY B.2 9 EXAMINATION CATEGORY B.3 10 EXAMINATION CATEGORY B.4 11 EXAMINATION CATEGORY C.1 12-13 EXAMINATION CATEGORY C.2 14-18 EXAMINATION CATEGORY C.3 19 EXAMINATION CATEGORY C.4 20 1477x
TDR 781 REVISION 1 APPENDIX II PAGE 2 of 20 APPENDIX II OVERVIEW This appendix contains the results of the 1986 reevaluation of the ,
previous examina. tion data. This includes data from the 1982 (pre-kinetic expanston), 1983 (post-kinetic expansion), and 1984 (Tech. Spec. required )
examinations. These reviews included both an objective comparison of the evaluation results and a subjective evaluation by the certified data analyst.
The following terminology is used in the attached tables Tube I.0: Self Explanatory Evaluation Type: Indicates source of data; 4 1986 - Official Evaluation 1982R/1984R - 1986 Re-evaluation of previous data 1982R/1984E - Original evaluation results.
l Indication Elevation : Axial location of the indication as described in l l
Section III of this report.
% T.W.: The percent through wall penetration of the indication (s). The slash (/) indicates a range of values for multiple indications.
NDD - No Detectable Indications 1477x qa
TDR 781 REVISION 1 APPENDIX II PAGE _1 of 20 PD - Possible Defect which cannot be interpretated.
Volts: The amplitude of the ECT signals. The slash (/)
indicates a range of voltages.
Colls: The number of adjacent 8xl coils which respond to defect.
Change: The objective opinion of the data analyst in I
determining if the tubes condition has changed between examinations.
l l
l 1477x qa t
TDR 781 REVISION I APPENDIX II PAGE 4 of _20 Review of Previous ECT Data Examination Category A.I.
ISI Tubes (TR-008 Table A-1. Category IA) 4 .
Evaluation Indication 540 H.G.S.D 8x1 Absolute _ Change Tube I.D. Type Elevation 1 T.H. Origin Volts # Colls Volts Past-86 Remarks Tubes Plugged for Indications 1 0% 5 T.W.
B-94-3 1986 US-0.7/ 20/ ID .9/ 1/ 1.1/ No Indications were undercalled US+6.8 50 2.4 2 1.9 during 1984 evaluations.
1984R US-0.7/ 20/ ID 1.0/ N/A - Indications represent an area 56 3.3 of multiple indications.
US+6.6 1984E US-0.7/ <20/ ID 2.0/ II .3/
US+6.1 21 4.0 2 1.2 4
B-103-5 1986 US+5.8 56 ID 2.9 2 2.0 No Indications were undercalled during 1984 evaluations.
1984R US+5.7 46 ID 4.2 N/A -
1984E US+5.7 34 ID 4.4 1 1.6 Tubes Plugged Preventatively 2 4.4 Yes Note: Tube has multiple I.D.
A-104-123 1986 US+0.0 DTS - -
Indications in area. 1 T.H.
1984R US+0.0 PD ID 4.2 N/A - indeterminate. Ind. appears as combined defect and dent.
1984E US-0.1 NDO - - 2 3.1 1477x qa
i TDR 781 REVISION 1 APPENDIX II PAGE 5 of _20 Review of Previous ECT Data Examination Category A.I.
ISI Tubes (TR-008 Table A-1, Category IA) Continued Evaluation Indication 540 H.G.S.D Sul Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks US+0.0 DTS 2.2 1 2.5 No Note: Tube has multiple I.D.
B-43-10 1986 -
Indications in area. Tube 1984R US+0.0 DTS - - N/A - also had a previously reported 8x1 Indication 1984E US+0.0 NDD - - NDD - (1984) at U5-0.2.
US+0.0 DTS 4.5 1 3.6 No Note: Tube has muittple I.D.
B-89-5 1986 -
Indications tr. area.
1984R US+0.0 DTS - 5.2 N/A -
1984E US+0.0 NDD - -
2 1.8 l .
2.2 1.9 No Note: Tube also has a <40%,
B-94-4 1986 US+0.0 DTS - 1 I coli ind. at US-0.3. Ind 4
US+0.0 DTS -
2.2 N/A - at US-0.3 reported both .540 1984R
& 8xl in 1984.
1984E US+0.0 NDD - -
NDD -
i 1477x qa
t TDR 781 REVISION 1 APPENDIX II PAGE 6 of 20 Review of Previous ECT Data Examination Category A.2.
31 Random Sample Tubes (TR-008 Table A-1, Category 2)
Evaluation Indication 540 H.G.S.D 8x1 Absolute Change Tube I.D. Type Elevation 1 T.H. Origin Volts # Colls Volts Past-86 Remarks Tubes Removed from Service A-94-126 1986 US+1.7 74 ID 2.9 1 .9 No Indication located just below kinetic expansion. Phase an9,le may be affected by transition signal.
1984R US+1.9 53 ID 2.4 N/A -
1984E US+1.7 NDD - - N/A -
Tubes to be Treated as Degraded Tubes A-63-129 1986 US+2.6/ 33/ ID 1.1/ 1/ .1/ No Indications were present in US,4.7 46 1.5 2 .3 1984.
1984R US+2.6/ 36/ ID .8/ N/A -
US+4.7 46 1.1 1984E US+2.6 NDD - - N/A -
US+4.7 B-30-6.9 1986 14+12.8 46 ID .9 1 .4 No Tube also had other indications which were not 1982R 14+12.9 46 ID 1.0 N/A - confirmed by 8x1. (1984 &
1986).
1982E NDD - - N/A -
i 1477x qa i
TDR 781 REVISION 1 APPENDIX II PAGE 7 of 20 Review of Previous ECT Data Examination Category A.2.
3% Random Sample Tubes (TR-008 Table A-1, Category 2) Continued Evaluation Indication 540 H.G.S.D 8x1 Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks A-68-80 1986 11+12.0 23 ID 1.0 1 1.1 No l
1982R 11+12.0 26 ID 1.4 N/A -
1982E NDD - - N/A -
B-104-77 1986 US+4.3 26 ID 1.7 1 .4 Yes Signal Amplitude and S/N ratto increased from 1982 to 1982R US+4.3 30 ID 1.2 N/A - 1986.
1 1982E NDO - - N/A -
l l
l t
[ 1477x qa
- TDR 781 Y REVISION 1 APPENDIX II PAGE 8 of _20 Review of Previous ECT Data ,
Examination Category B.I.
Sample, Tubes Adjacent to Plugged Tubes (Wear Tubes, TR-008 Table A-1 Categories Ib c,g)
Evaluation Indication 540 H.G.S.D Sul Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks B-146-37 1986 12+7.0 26 ID .9 1 .5 No 1984R 12+7.0 23 ID 1.2 N/A -
1984E N00 - -
N/A -
l l
l l
l 1477x qa
d TDR 781 REVISION 1 APPENDIX II PAGE 9 of 20 Review of Previous ECT Data Examination Category 8.2.
Sample, Tubes in High Plug Density Area (TR-008 Table A-1 Categories le)
Evaluation Indication 540 H.G.S.O Sul Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks No Indications identifled in this category therefore no data review was performed.
l l
l l
1 1477x qa
b i' TDR 781 REVISION 1 l
APPENDIX II 4
PAGE 10 of 20 l
Review of Previous ECT Data i
Examination Category B.3.
Kinetic Expansion Area Indications (TR-008 Table A-1 Categories Id) i Evaluation Indication 540 H.G.S.D Sul Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks 1986 results consistant with 1983 results therefore no data review performed, f
i i
l l
l
]
J 1477x qa
}
TDR 781 .
REVISION 1 APPENDIX II PAGE 11 of _20 Review of Previous ECT Data Examination Category B.4.
31 Sample, Upper Tube Sheet Only (TR-008 Table A-1 Categories If)
! Evaluation Indication 540 H.G.S.D Sul Absolute _ Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks A-49-99 1986 US+6.9 N/A - - 1 1.0 Indication located .1" below kinetic expansion. 1 T.W.
1983R US+6.9 N/A - - NDO -
Indeterminate.
1983E N/A - - N00 -
)
B-98-84 1986 US+7.0 N/A - -
2 1.3 Indication located at transition to kinetic J 1983R US+7.0 N/A - -
N00 - expansion. No. 540" H.G.S.O exam, attempted in 1986 due to location.
1983E N/A - - N00 -
i 1
)
1477x qa
TDR 781 REVISION 1 APPENDIX II PAGE 12 of 20 Review of Previous ECT Data Examination Category C.I.
Tubes with Indications Not Confirmed by 8xl Absolute Exam In 1984 Evaluation Indication 540 H.G.S.D Sul Absolute _ Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks Tubes Plugged for Indications 250% T.W.
15+19.9 73 ID 1.3 1 .5 No Indication was present during A-2-8 1986 1984 8x1 exam. but was alssed.
1984R 15+19.9 70 10 1.5 2 1.1 1984E 15+19.9 <40 ID Mult. N00 -
14+3.3 60 ID 1.3 1 1.0 No Indication was present in A-54-2 1986 1984 but recorded at wrong 1984R 14+3.1 48 ID 1.2 2 .4 elevation on 540 H.G.S.D. Sul therefore evaluated in wrong 1984E 13+3.1 48 ID 1.2 N00 - area.
1986 14 5.8 63 ID .8 1 .4 No Indication was present in 1984 but recorded at wrong 1984R 14 5.8 48 ID .7 I .2 elevation on 540 H.G.S.D. 8x1 therefore evaluated in wrong ,
1984E 13 5.4 48 ID .7 N00 - area.
05 5.7 70 ID 1.3 1 1.2 No Indication not detectable on A-104-27 1986 review of 1984 8x1.
1984R US+5.7 73 ID 1.2 N00 -
1984E US+5.7 80 ID 1.1 N00 -
1477x qa .
l TDR 781 REVISION 1 APPENDIX II PAGE 13 of 20 Review of Previous ECT Data Examination Category C.I.
Tubes with Indications Not Confirmed by 8ul Absolute Exam In 1984 (Continued)
Evaluation Indication 540 H.G.S.D Sul Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks Tube Plugged for Indications >20% T.W. (Lane Wedge) 15+12.9 36 ID .9 1 .6 No No change was identified in A-77-6 1986
.540 H.G.S.D. 1984 8ul was 1984R 15+12.8 33 ID .9 N/A - not reviewed.
l 1984E 15+12.8 33 ID .9 NDO -
Tube Preventatively Plugged A-14-75 1986 03+18.9 S/N ID .7 2 1.1 No Indication located in area of high back ground noise.
03+18.9 S/M ID - N/A - Percent through wall cannot 1984R be determined.
1984E 03+18.9 h0D - - N/A -
I 1477x qa
+
TDR 781 REVISION 1 APPENDIX II PAGE 14 of _20 Review of Previous ECT Data Examination Category C.2.
Lane /Nedge Area Tubes Evaluation Indication 540 H.G.S.D Sul Absolute _ Change Tube I.D. Type Elevation 1 T.W. Origin Volts #_Colls Volts Past-86 Remarks Tubes Removed From Service A-74-31 1986 US+1.1/ 30/ ID 1.0/ 1/ .4/ No 1986 data has better S/N US+5.5 97 1 .5 ratto than 1984 making indications more detectable.
1984R US+3.1/ 46/ ID .9/ N/A -
US,5.4 96 1.0 1984E NDO - - N/A -
15+3.9 33 ID 1.2 1 1.0 No Indication was present in B-73-1 1986 noise of about 1.0 volt in 1984R 15+3.1 26 ID 1.7 N/A - 1984.
1984E NDO - -
N/A -
15+43.9 26/ 10 2.1/ 1/ 2.0/ No Although the ampittude of the 8-77-18 1986 indications increased from 15 44.0 66 3.4 2 4.5 1982. 1986 the basic shape 15+44.2/ <20/ ID 1.0/ N/A - of the ECT signals did not 1982R -
15 44.6 43 1.6 change.
1982E NDO - - N/A -
1477x qa
TDR 781 REVISION 1 APPENDIX II PAGE 15 of _20 Review of Previous ECT Data Examination Category C.2. Continued Lane / Wedge Area Tubes Evaluation Indication 540 H.G.S.D Sul Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks B-77-57 1986 US+5.2 63 ID 1.7 2 2.0 Yes Note: Tube also has other ID indications in UTS. S/N 56 ID .6 N/A - ratlo definitly increased 1982R US+5.3 from 1982 to 1986.
1982E NDO - - N/A -
US+2.7 99 ID 1.6 3 3.3 Yes S/N ratto and amplitude B-78-18 1986 increased from 1982 to 1986.
1982 indication would not be 1982R US+2.7 S/N ID .5 N/A -
evaluated for 1 T.W. during NDO - - N/A - production exam.
1982E 66 ID 2.2 2 2.1 Yes S/N*ratto and amplitude B-78-20 1986 US+4.8 increased from 1982 to 1986.
PD ID .5 N/A - 1982 data shows a possible 1982R US+4.7 defect which is not NDO - - N/A - Interpretable.
1982E I
1 i
1 1477x qa
TDR 781 -
REVISION 1 APPEN0!X II PAGE 16 of 20 Review of Previous ECT Data Examination Category C.2. Continued Lane / Hedge Area Tubes Evaluation Indication 540 H.G.S.D Sul Absolute Change Tube I.D. Type Elevation 7. T.W. Or_lgin Volts # Colls Volts Past-86 Remarks B-78-57 1986 US+6.2 56 ID 2.4 2 3.9 Yes Review of 1982 data shows no interpretable indications.
1982R US+6.2 N00 - - N/A - Note: Tube has additional ID indications in 1986.
1982E N00 - - N/A -
1986 US+1.7 93 ID 2.4 2 1.3 Yes S/N ratto and amplitude B-79-57 increased from 1982 to 1986.
1982R US+1.8 <20 ID 1.2 N/A -
l 1982E NDD - - N/A -
B ~i7-14 1986 US+0.0 97 -
3.6 3 3.1 Yes Origin of 1986 Indication is i
indeterminate. Tube has 1982R US+0.0 PD 00 2.3 N/A - other ID Indications in the UTS.
1982E N00 - - N/A -
l l
1477x qa
TDR 781 .
REVISION 1 APPENDIX II PAGE 17 of 20 Review of Previous ECT Data Examination Category C.2. Continued Lane / Wedge Area Tubes
- Evaluation Indication 540 H.G.S.D 8ul Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colls Volts Past-86 Remarks US+0.0 DTS - 1.6 1 .8 Yes Origin of 1986 Indication is B-79-8 1986 indeterminate. 1986 ID 1.8 N/A - Indication appears as a 1984R US+0.0 PD
~ possible dent and defect NDO - - N/A - combined.
1984E Tubes to be Treated as Degraded Tubes 1986 US+5.5 43 ID 2.8 1 .4 No B-74-28 1984R US+5.6 36 ID 2.0 N/A -
1984E NDO - - N/A -
US+5.7 20 ID 1.0 1 .6 No Note: Tube has other ID A-78-31 1986 Indications in UTS.
1984R US+5.6 26 ID .9 N/A -
NDO - - N/A -
1984E 1477x qa
TDR 781 REVISION 1 APPENDIX II PAGE 18 of _20 Review of Previous ECT Data Examination Category C.2. Continued Lane /Wed9e Area Tubes Evaluation Indication 540 H.G.S.D Sul Absolute Change Tube I.D. Type Elevation 1 T.W. Origin Volts # Colts Volts Past-86 Remarks 8-73-18 1986 US+5.6 43 ID 2.9 1 1.1 Yes S/N ratto and amplitude increased from 1982 to 1986.
1982R US+5.6 20 ID 1.3 N/A -
1982E NDO - - N/A -
8-74-18 1986 US+6.4 36 ID 1.7 1 1.2 Yes No indication was detectable on the review of the 1982 1982R NDO - - N/A - data.
1982E NDO - - N/A -
1477x qa
TDR 781 .
REVISION 1 [
APPENDIX II
. PAGE 19 of _20 Review of Previous ECT Data Examination Category C.3.
Gap Tubes Evaluation Indication 540 H.G.S.D Sul Absolute Change
! Tube I.D. Type Elevation 1. T.W. Origin Volts # Colls Volts Past-86 Remarks l
No Indications identified in this Category, therefore no data review was performed.
l b
b I
1417x qa
l 1 .
TDR 781 l REVISION 1 APPENDIX II PAGE 20 of 20 Review of Previous ECT Data Examination Category C.4.
Special Category Tubes Evaluation Indication 540 H.G.S.D Sul Absolute Change Tube I.D. Type Elevatic, 1 T.H. Origin Volts # Colts Volts Past-86 Remarks No Indications identifled in this Category, therefore no data review was performed.
l l
l 1477x qa t
I l
l TDR 781 REV.0 l APPENDIX III !
PAGE 1 of _41 APPENDIX III i !
ISI TU8E LIST TABLE OF CONTENTS PAGE NO.
l OVERVIEW AND NOTES 2-3 i
i OTSG A ISI LIST 4 - 36 OTSG 8 ISI LIST 37 - 41 i
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j 1463x/QA b V
TOR 781 REV.0 APPENDIX III PAGE 1 of 41 OTSG A & B ISI TUBE LIST FOR 1986 ECT OUTAGE SM OVERVIEW ,
This list contains the tubes identifled as ISI tubes for the 1986 ECT outage and includes those tubes required to be examined per category 1(a) of Topical Report 008, Rev. 3, Table A-1. This includes both tubes with indications 20-39% throughwall which are classified as " Degraded Tubes" per Tech. Spec. 4.19 and tubes which have indications less than 207. throughwall but are being monitored at GPUN's discretion.
The list of tubes is based on the 1984 Examination Results in the TMI ECT data bases dated 04/29/85 for the .540" H.G.S.D. and 02/05/85 for the 8 x 1 Absolute. Included in the list are all tubes remaining inservice with .540" indications from 0-39% which were confirmed by 8 x 1 absolute during the 1984 examinations. The 1986 Examination results are extracted from the TMI data bases (Conam System) dated 04/17/86 for both 8xl Abslute and .540" H.G.S.O.
i I
1463x/QA
TOR 781 .
REV.0 APPENDIX III PAGE 3 of 41 OTSG A & 8 ISI TUBE LIST FOR 1986 ECT OUTAGE SM NOTES GENERAL i
- Location of indications is based on data from .540" H.G.S.O.
examinations.
- For tubes with more than one examination, the data recorded for elevation, percent, and voltage reflects the "mean" value.
- The correlation of the 8 x 1 to .540" H.G.S.D. data is based on a
- "best fit" correlation. Inaccuracies in the 8 x 1 probe travel speed prohibit making direct correlations.
- Indications where the data are shown as XXX/XXX reflect an area of multiple ECT signals and represent the lowest and highest
- elevations, percents, and voltages for the area.
l
- N00 indicates area was specifically evaluated by 8 x 1, and
.l determined to contain No Oetectable Olscontinuities.
- NR indicates area was not specifically evaluated by 8 x 1, and therefore small indications may have been present but were Not Recorded individually.
SPECIFIC 1 NOTE 1 - Additional reviews performed by Conam Data Analysts identify the indications as possibly "non-relevant" based on signal formation 1 and rise time. Present screening criteria do not permit deleting these indications from the ISI population.
! NOTE 2 - Values shown in the 1984 % (540) column reoresent a 1986 re-evaluation of the 1984 data.
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n 1 0 9 0 5 2 1 8 a 8 7 5 6 2 0 0 1
i 2 2 t 1 1 0 0 1 1 0 1 a - + - + + + - 3 +
r 4 4 7 8 1 2 4 + 9 0 2 0 1
a 0 0 0 1 1 t
1 1 1 1 1 1 1 2 .
1 _
h3 T
3 3
3 3
3 3
3 3
w 8 a 8 8 8 8 8 8 8 8 4
R 4 4 4 4 4 4 4 4 1
1 1 1 1 1 1 1 1
_