ML20155E751

Rev 1 to Form NIS-1 Owners Data Rept for Isi,Rept on 1997 Outage 12R EC Exams of TMI-1 OTSG Tubing

ML20155E751
Person / Time
Site:	Three Mile Island
Issue date:	10/15/1998
From:	Freeman R, Navratil G GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20155E747	List: ML20155E742 ML20155E751
References
NUDOCS 9811050170
Download: ML20155E751 (5)

Text

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o ENCLOSUREI Attaclunent 1 REVISION 1 l

l FORM NIS-1 OWNERS' DATA REPORT FOR INSERVICE INSPECTIONS Revision i REPORT ON THE 1997 OUTAGE 12R EDDY CURRENT EXAMINATIONS OF Tile TMI l OTSG TUBING Prepared By:

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/d / /2 tI Michard H. Freeman Prepared By:

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][_/11/M Gene J. Navratil 1O $ $&

Approved By:

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Richard O. Barley (,)

Approved By:

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[hn S. Jgvitz

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Attaciunent I t'

REVISION 1 PAGE3 TABLE OF CONTENTS PAGE NO.

IV.

CONDITION ASSESSMENTS 50 i

l A,

CONDITION MONITORING 50 1

B.

OPERATIONAL ASSESSMENT 51

[

V.

CONCLUSIONS 52 4

VL BEFERENCES 53 1

1:

Total Pages Main Body = 53 Total Pages = 213 Figure 11 1 B&W Rolled Sleeve

'19 f

. Figure 11-2 OTSG Design 20 Figure 111-1 OTSG A Kinetic Expansion and Lane / Wedge Examination Locations 26 Figure ill-2 OTSG-B Kinetic Expansion and I.ane/ Wedge Examination Locations 27 i

Figure 111-3 OTSG-A Sleeve Examination Locations 28 j

Figure III-4 OTSG-B Sleeve Examination Locations 29 j.

Figure 111-5 Growth ofID Indications TMI l Both SGs 37 L

Figure III-6 Changein Circ Extent TMI I Both SGs 39 Figure 111-7 Change in Axial Extent TMI I Both SGs 40 t

Figure 111-8 OTSG-A Tube-to-tube Support Plate Wear Locations 41 Figure III 9

. OTSG A Tube-to-tube Support Plate Wear Locations 42 Table 1 1 Tubes Removed From Service 5

Table !! l Eddy Current Probes Used During Outage 12R 7

Ta'ie112

. Minimum Axial Kinetic Expansion Length Values 12 o

Table 113 Theoretical MSLB Leakage Based on Axial Extent 13 Table 11 Theoretical MSLB Leakage Based on Circumferential Extent 13 Table 11-5 Pre-Removal Eddy Current Examinations 17 Table 1111 Bobbin CoilTube Examination Scope 22 Table 1112 MRPC Tube Examinations 23 Table 111-3 Sleeve Examinations 25 Table lil 4 Technical Specification Category Results for OTSG-A 31 Table 1115 Technical Specilication Category Results for OTSG-B 31

~ Table ill-6 Newly Defective or Previously Degraded with >10% Growth: OTSG-A 11 Table !!I 7 Defective Indications With $10% TW or 50.6 Volts Growth: OTSG-A 32 Table 111-8 Newly Degraded Tubes: OTSG-A 32 Table 1119 Previously Degraded Indications with >10%TW or >0.6 Volts Growth: OTSG-A 34 Table 11110 Newly Defective or Previously Degraded >10% Growth: OTSG-B 35 Table 11111 Repairable hidications With $10% or 50.6 Volts Growth: OTSG-B 35 Table !!! 12 Newly Degraded Tubes: OTSG B 35 Table 111 13 ID Volumetric IGA Average Change in Length / Width Measurements 38 Table 111-14 Number of Occurrences of Wear by Support Location 41 Table III 15 Confinned Outside Diameter Indications 44

Table III 16 OTSG-A Kinetic Expanston Examination Results 45 Table III-17 OTSG B Kinetic Expansion Examination Residts 46 Table 111-18 OTSG-A Kinctic Expansion Leakage Contributors 46 Table 111 19 -

OTSG-B Kinetic Expansion Leakage Contributors 47 Table 11120 TMI l OTSG Pressure Test List OTSG A 49 Table lil 21 TMI l in-Situ Pressure Test List OTSG-B 49

O y

Attaciunent i REVISION I PAGE4 TABLE OF CONTENTS PAGE NO.

Appendix !

Analysis Codes 4

Appendix 11 Freespan Indications ofInterest 79 Appendix 111 Kinetic Expansion Indications of Interest 77 Revision i Note-Corrected third paragraph of page 11, Section C.1 to reficct the correct number of ID IGA indications remaining in senice. Resision 0 did not account for tubes remmed from senice by plugging. Remose Resision o pages I through 4 and j

replace with Revision 1 pages 1 through 4. Remove Revision 0 page 11 and replace j

with Revision i page 11.

l

1 Attaciunent i REVISION I PAGE 11 l

C.

DISPOSITION OF RESULTS C.1 Inside Diameter IGA Inside diameter (ID) IGA eddy current indications were dispositioned in accordance with the TMI I Tecimical Specincations, including GPUN's Technical Specification Change Request (TSCR) #263 and the resulting License Amendment No. 206. In accordance with the amendment, all ID IGA indications that were detected during the bobbin coil cddy current examinations were subsequently examined with h!RPC probes The length and width of the indications (as discerned by h!RPC extent calls) were compared to the structural limits described in the amendment.

In addition, the MRPC examinations were used to confinn that the indications were volumetric in geometry (-in order to prevent crack-like indications from remaining in service.) The surface of origin (i.e. inside surface) was also confirmed for all ID IGA indications. ID IGA indications with sufGcient bobbin coil signal-to-noise ratio and bobbin voltage were also given a percent through wall estimate based on phase angle analysis.

ID IG A indications in expanded tubing >40% through wall, or of axial and circumferential extent >0.25" or 0.52",

respectively, were removed from service by plugging in accordance with the Tech. Specs. In addition, as required by the Technical Specifications, the remaming ID IG A indications were verified for serviceability by in-situ pressure testing and a growth evaluation. [See Sections ill,B.1 and til.C.1 of this report.l Appendix 11 provides a list of tubes containing ID IG A indications in the freespan. The 3-letter code "VOL" was used to delineate ID IGA indications; the tube numbers of those tubes having ID IGA flaws have been placed in bnid print. [ Note that some of the indications listed in the Appendices were removed from senice as a result of the tube plugging listed in Table I-1.] At the end of the outage 793 ID IGA indications in 327 CfrSG "A" tubes, and 78 ID IG A indications in 22 OTSG "B" tubes, remain in service in the TMI l generators.

C.2 Kinetic Expansion Recion TMI l's OTSGs have kinetic expansions within the generators' upper tubesheets. During the 12R Outage, a >21%

sample of the tubes with 17" kinetic expansions and 100% of the tubes with 22" kinetic expansions were inspected with a rotating probe (i.e. MRPC). He specific region examined is further defined in Section 111.. A of this report.

Analysis Process Each tube inspected with the rotating probe in the kinetic expansion region was analyzed to detennine if the tube was i

a structural and/or leakage concern. There are five factors which were used in addressing the structural and leakage issues associated with arw indication that was found. These are:

l l) the axial and/or circumferential extent of the indication,

2) the estimated depth of the indication,

3) the radial distance of the tube from the center of the tube bundle,

4) w hether the kinetic expansion was 17" or 22" in length, and

5) the minimum required axial kinetic expansion length (AKEL.) to ensure structural integrity in the event of a MSLB.

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