ML20244C536
| ML20244C536 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 07/31/1988 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20244C534 | List: |
| References | |
| NUDOCS 8906150009 | |
| Download: ML20244C536 (24) | |
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SEQUOYAH NUCLEAR PLANT UNIT.'1E ' '
4 ,
' CYCLE 3B INSPECTION I
dE JULY 1988. ; - < >
4 STEAM GENERATOR (S/G). TUBING' INSPECTION RESULTS-1 (0906150009 890608 PDR ADOCK 05000327,1li 3
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v SEQUOYAH UNIT 1-CYCLE'3B INSPECTION JULY 1988 STEAM GENERATOP. TUBIN'G INSPECTION.RESULTS.
CONTEHTS j Table 1 Inspection Summary.:
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Table 2- S/G 1' Inspection Summary-Table 3 S/G 2. Inspection Summary- 4 Table 4 -S/G 3 Inspection. Summary Table.5 S/G 4 Inspection Summary Table 6 Indications.S/G 1-4 Table 7 Tubes Plugged As Of Cycle 3B- [
Table B Plugged Tube Summary q
Table 9 Nomenclature- 1 I
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TABLE 1 SEQUOYAH UNIT 1 CYCLE 3D INSPECTION JULY 1988 INSPECTION
SUMMARY
S/G 1 S/G 2 S/G 3 'S/G 4 Total Tubes Examined 890 258 258 914 Tubes Recording Defects (140% Wall Loss) 1 7 21 18 Tubes Recording Degradation (120% to (40% Wall Loss) 4 0 0 1 Tubes Recording Imperf ect ions
(<20% Wall Loss) 7 0 0 1
TABLE 2 SEQUOYAH UNIT 1 CYCLE 3B INSPECTION JULY 1988 STEAM GENERATOR 1 INSPECTION
SUMMARY
TOTAL NUMBER OF TUBES EXAMINED 890 ISI SAMPLE NUMBER OF TUBES Extent (probe type)
General Defect Full Length Exams CTE-HTE (bobbin coll) 695 !!!
l NON-ISI SAMPLE NUMBER OF TUBES i
Extent (probe type)
General Defect Partial Length Exams C06-HTE (bobbin coll) 9 C05-HTE (bobbin coll) 1 H07-CTE (bobbin coil) 2 Rows 1 and 2 - General Defect Exams and Complimentary Specialized U-Bend Exams H07-HTE (bobbin coll) and C07-CTE (bobbin coll) and C07-H07 (MRPC) 177 C07-HTE (bobbin coll) and C07-CTE (bobbin col) and C07-H07 (MRPC) 5 C06-HTE (bobbin coll) and C07-CTE (bobbin coil) and C07-H07 (MRPC) 1
TABLE 2 (Cont)
SEQUOYAH UNIT 1 CYCLE 3B INSPECTION JULY 1988 STEAM GENERATOR 1 INSPECTION
SUMMARY
INDI1ATIONS - ISI SAMPLE NUMBER OF TUBES Tubes Recording Defects C 140% Wall Loss Tubes Recording Degradation 4 120% to <40% Wall Loss Tubes Recording Imperfections 7 (20% Wall Loss INDICATIONS - NON ISI SAMPLES ~ NUMBER OF TUBES Tubes Recording Defects 4 140% Wall Loss Tubes Recording Degradation 0 120 to (40% Wall Loss Tubes Recording Imperfections 0 (20% Wall Loss
TABLE 3 SEQUOYAH UNIT 1 CYCLE 3B INSPECTION JULY 1988 STEAM GENERATOR 2 INSPECTION
SUMMARY
TOTAL NUMBER OF TUBES EXAMINED 258 NON-ISI SAMPLE NUMBER OF TUBES Extent (probe type)
General Defect Partial Length Exams and Special Top-of-Tubesheet Exams C07-HTE (bobbin coll) 1 H02-HTE (bobbin coll) 19 H02-HTE (bobbin coll) and HTS +2/-4 (MRPC) 6 HTS +2/-4 (MRPC) 47 Rows 1 and 2 Specialized Exans C07-H07 (MRPC) 181 C07-1107 (MRPC) and HTS +2/-4 (MRPC) 4 INDICATIONS - NON-ISI SAMPLE NUMBER OF TUBES Tubes Recording Defects 7 (140% Wall Loss)
Tubes Recording Degradation 0 (120% to <40% Wall Loss)
Tubes Recording Imperfections 0
(<20% Wall Loss)
TABLE 4 SEQUOYAH UNIT.1 CYCLE 3B INSPECTION JULY 1988 STEAM GENERATOR 3 INSPECTION
SUMMARY
TOTAL NUMBER OF TUBES EXAMINED 258 NON-ISI SAMPLE NUMBER OF TUBES Extent (Probe Type)
Specialized Rows 1 and 2 U-Bend Region Exams
, C07-H07 (MRPC) 185 1
Specialized Top of Tubesheet Exams HTS +2/-4 (MRPC) 73 INDICATIONS - NON-ISI SAMPLE NUMBER OF TUBES Tubes Recording Defects 21
(>_40% Wall Loss)
Tubes Recording Degradatica 0 Q20% to (40% Wall Loss)
Tubes Recording Imperfections 0
(<20% Wall Loss)
TABLE 5 SEQUOYAH UNIT 1 CYCLE 3B INSPECTION
. JULY 1988 STEAM GENERATOR 4 INSPECTION
SUMMARY
TOTAL NUMBER OF TUBES EXAMINED 914 IST SAMPLE NUMBER OF TUBES Extent (probe type)
General Defect Full Length Exams CTE-HTE 695 NON-ISI SAMPLE NUMBER OF TUBES Extent (probe type) !!
General Defect Full Length Exams and Complimentary Specialized Exams CTE-HTE (bobbin coll) and H06-H05 (MRPC) 1 CTE-HTE (bobbin coll) and H0l+2/-2 (MRPC) 4 CTE-HTE (bobbin coll) and HTS +2/-2 (MRPC) 1 General Defect Partial Length Exams H07-CTE (bobbin coll) 4 l Specialized Exams of Dented TSPs H06-H05 (MRPC) 1 H06 (MRPC) 1 H03 (MRPC) 2 H0l+2/-2 (MRPC) 18 Rows 1 and 2 General Defect Partial Length Exams and Complimentary Specialized U-bend Exams H07-HTE (bobbin coll) and C07-CTE (bobbin coil) and C07-H07 (MRPC)) 187
TABLE 5 (CONTINUED)
SE'JUOYAH UNIT 1 CYCLE'3B INSPECTION JULY.1988 STEAM GENERATOR 4 INSPECTION
SUMMARY
INDICATIONS-- ISI SAMPLE NUMBER OF TUBES Tubes Recording Defects 0 140% Wall Loss Tubes Eecording Degradation 1 120% to <iO% Wall Loss Tubes Recording Imperfections 1
<20% Wall Loss INDICATIONS - NON-ISI SAMPLE NUMBER OF TUBES Tubes Recording Defects 18 140% Wall Loss Tcbes Recording Degradation 0 120% to (40% Wall Loss Tut.es Recording Imperfections 0
<20il, Wall Loss
~
, TABLE 6 1 SEQUOYAH UNIT 1 CYCLE 3B INSPECTION JULY 1988' INDICATIONS.
H Percent- >
-Flaw S/G Row o Col- Location: Degradation' l Characterization Resolution ll 1 -1 40 H07+8.2' 2,40% : U-bend'(IDI) . Plugged.by E-1" 'l 47 307+8.0' 2,40%- : U-bend (IDI), Plugged by E.; ,
-l' ~1 '71 H07+8.2 2,40% U-bend-(IDI)- : Plugged by E- J 1 ,
1 73' H07+2.9- 140% U-bend (IDI): Plugged by_1; _,
~1 1. 1 ' HTS +17.5 :28% (1)- 'No action.. required;
- 1 1- 90- HTS +17.7' 21% (1)- .No action required I
>l' , 1- 52 HTS +17. 7- '22% (1).. .
No action required ~
-1 9' '69 H01+33.1- 26% Manufacturing flav No action required 2 1 12 H07+7.7' 2,40% .U-bend-(IDI). Plugged'by'E H07+7.2 -U-bend-(IDI) Plugged by E, 2,40% . l 2 1 13 H07+8.7' 2,40% ..U-bend (IDI) Plugged by.E .'
2 'l 21 H07+8.5 2,40% U-bend (IDI). Plugged by E 2 1 22 H07+8.0 2,40% - U-bend.(IDI) Plugged by'E !
2 1 25 H07+8.5 2,40% U-bend.(IDI) ' Plugged by E: 1 2 1 39 H07+2.5 2,40% U-bend-(IDI) Plugged by E-2 1 75 H07+2.8 2,40% U-bend-(IDI)- Plugged by W-1 3 1 8 H07+2.5 . 2,40% ; U-bend.(IDI) Plugged by E R 3 1 11 H07+2.6 2,40% U-bend-(IDI) ' Plugged by E~.
3 1 20 H07+7.8 2,40% U-bend-(IDI). -Plugged by 1 3 1 21 in.7+8.1 2,40% U-bend-(IDI). _ Plugged by E ]
3 1 24 H07+8.6 2,40% U-bend (IDI) L Plugged by E' j 3 1 30 H07+2.9 2,40% U-bend (IDI) Plugged.by E 1 3~ 1 31 H07+2.9 2,40% U-bend ~(IDI) -Plugged by E- 1 3 1 35 H07+3.5 2,40% U-bend-(IDI)? -Plugged by E
.3 1 39 H07+3.0 2,40% ' U-bend (IDI)- . Plugged by E ,
3 1 44 H07+8.4 2,40% U-bend (IDI) Plugged by E- i 3 1 47 H07+8.6 2,40% U-bend-(IDI) Plugged'.by E; 3 1 54 H07+6.0 2,40% U-bend-(IDI) . Plugged by 1- .j H07+5.6 ; 2.40% U-bend.(IDI): ~~ P lugged by E
{
H07+5.3 2,40% U-bend-(IDI)- ~ Plugged by E- j 3 1 57 H07+7.9 2,40% U-bend-(IDI) Plugged by E j 3 1 60 H07+7.0 2,40% U-bend-(IDI)- Plugged by;E j H07+7.0' 2,40% U-bend (IDI) 1 Plugged by E ;
3 1 62 H07+3.9 2,40% U-bend (IDI) Plugged by E.'
3 1 63 H07+5.9 2,40% U-bend.(IDI): Plugged-by E:
3 1 72 H0747.9 2,40% U-bend-(IDI) ~ Plugged by 1
'1 3 1 79 H074 7.9 2,40% U-bend (IDI)- Plugged by E. '
3 1 83 H07+7.6 2,40% U-bend (IDI) Plugged by EL j 3 1 88 H07+4.5 2,40% U-bend (IDI) Plugged by 1 i 3 1 92 H07+5.0 2,40% U-bend (IDI) Plugged.by E (1) Flow lane blocking device damage, device removed during. previous outage, no significant increase in degradation.
IDI - Indication initiated from the ID surface.
1 i
1
TABLE 6 SEQUOYAH UNIT 1 CYCLE 3B INSPECTION JULY 1988 INDICATIONS Percent Flaw S/G Row Col Location Degradation Characterization Resolution 4 1 9 H07+9.9 140% U-bend (IDI) Plugged by E 4 1 25 H07+8.2 140% U-bend (IDI) Plugged'by E 4 1 33 H07+8.3 140% U-bend (IDI) Plugged by y H07+8.5 140% U-bend (IDI) Plugged by E 4 1 34 H07+8.1 140% U-bend (IDI) Plugged by E 4 1 36 H07+5.5 140% U-bend (IDI) Plugged.by E1 H07+7.6 140% U-bend (IDI) Plugged by E 4 1 38 H07+7.3 140% U-bend (IDI) Pluggediby E-4 l' 41 H07+8.5 140% U-bend (IDI) Plugged by E 4 1 42 H07+6.5 140% U-bend (IDI) Plugged by E 4 1 45 H07+3.5 140% U-bend (IDI) PluggedLby E H07+3.9 140% U-bend (IDI) Plugged by E 4 1 49 H07+3.4 140% U-bend (IDI) Plugged by E 4 1 54 H07+7.8 140% U-bend (IDI) Plugged by E 4 1 57 H07+8.9 140% U-bend (IDI) Plugged by E 4 1 73 H07+2.8 140% U-bend (IDI) Plugged by E 4 1 89 H07+5.2 140% U-bend (IDI) Plugged by E H07+5.6 140% U-bend (IDI) Plugged by E 4 1 90 H07+5.8 140% U-bend (IDI) Plugged by E H07+5.5 140% U-bend (IDI) Plugged by E 4 1 92 H07+5.3 140% U-bend (IDT.) Plugged by E H0745.7 140% U-bend (IDI) Plugged by E H07+6.2 140% U-bend (IDI) Plugged by E H07+3.5 140% U-bend (IDI) Plugged by E 4 1 93 C07+5.5 140% U-bend (IDI) Plugged by E C07+5.1 140% U-bend (IDI) Plugged by U 4 1 94 H07+2.8 140% U-bend (IDI) Plugged by E 4 14 82 C07+40.5 120% Manufacturing Flaw No action required IDI - Indication initiated from the ID surface.
TABLE 7 SEQUOYAH UNIT 1 CYCLE 3B INSPECTION JULY 1988 TUBES PLUGGED AS OF CYCLE 3B STEAM GENERATOR 1 Row C lumn Indication Location Reason for Pluagina 1 17 N/A N/A See note 1 1 20 N/A N/A See note 1 1 40 140% U-Bend Eddy Current In31 cation 1 47 140% U-Bend Eddy Current Indication 1 61 N/A N/A See note 1 1 69 N/A N/A See note 1 1 71 140% U-Bend Eddy Current Indication 1 73 140% U-Bend Eddy Current Indication 1 81 N/A N/A See note 1 10 44 N/A N/A See note 2 STEAM GENERATOR 2 1 12 140% U-Bend Eddy Current Indication.
I 13 140% U-Bend Eddy Current Indication 1 21 140% U-Bend Eddy Current Indication 1 22 140% U-Bend Eddy Current Indication 1 25 140% D-Bend Eddy Current Indication 1 39 140% U-Bend Eddy Current Indication 1 43 N/A N/A See note 1 1 45 N/A N/A See note 1 1 63 N/A N/A See note 1 1 75 140% U-Bend Eddy Current Indications STEAM GENERATOR 3 1 8 140% U-Bend Eddy Current Indication 1 11 140% U-Bend Eddy Current Indication 1 20 140% U-Bend Eddy Current Indication 1 21 140% U-Bend Eddy Current Indication 1 24 140% U-Bend Eddy Current Indication 1 30 140% U-Bend Eddy Current Indication 1 31 140% U-Bend Eddy Current Indication 1 35 140% .U-Bend Eddy Current Indication 1 39 140% U-Bend Eddy Current Indication 1 44 140% U-Bend Eddy Current Indication 1 45 N/A N/A See note 1 1 47 140% U-Bend Eddy Current Indication 1 54 140% U-Bend Eddy Current Indication 1 57 140% U-Bend Eddy Current Indication 1 60 >40% U-Bend Eddy Current Indication
.I .
TABLE 7 (CONTINUED)
SEQUOYAH UNIT 1 CYCLE 3B INSPECTION JULY 1988 TUBES PLUGGED AS OF CYCLE 3B STEAM GENERATOR 3 (cont:inued)
Row Column Indication Location Reason for Pluquina 1 62 140% U-Bend Eddy Current Indication 1 63 140% U-Bend Eddy Current Indication l 1 72 140% U-Dend Eddy Current Indication 1 79 140% U-Bend Eddy Current Indication 1 83 140% U-Bend Eddy Current Indication i 1 84 N/A N/A See note 1 1 86 N/A N/A See note 1 1 88 140% U-Bend Eddy Current Indication 1 92 140% U-Bend Eddy Current Indication STEAM GENERATOR 4 1 9 140% U-Bend Eddy Current Indication 1 25 140% U-Bend Eddy Current Indication 1 33 140% U-Bend Eddy Current Indication 1 34 140% U-Bend Eddy Current Indication 1 36 140% U-Bend Eddy Current Indication 1 38 140% U-Bend Eddy Current Indication 1 41 140% U-Bend Eddy Current Indication 1 42 140% U-Bend Eddy Current Indication 1 45 140% U-Bend Eddy Current Indication 1 49 140% U-Bend Eddy Current Indication 1 54 140% U-Bend Eddy Current Indication 1 57 140% U-Bend Eddy Current Indication 1 73 140% U-Bend Eddy Current Indication 1 88 N/A N/A See note 1 1 89 140% U-Bend Eddy Current Indication 1 90 140% U-Bend Eddy Current Indication 1 92 140% U-Bend Eddy Current Indication 1 93 140% U-Bend Eddy Current Indication 1 94 140% U-Bend Eddy Current Indication Note 1: Combustion Engineering, Inc., iron band tube plugs were removed, and Westinghouse Electric Corporation mechanical plugs were installed. These tubes were previously plugged due to U-bend defects.
Note 2: A thernal/ hydraulic analysis identified this tube as being susceptible to excessive flow-indered vibration if dented at the top support plate (NRC Bulletin 88-02).
1318e/cas
TABLE 8 SEQUOYAH UNIT 1 CYCLE 3B INSPECTION JULY 1988 PLUGGED TUBE
SUMMARY
S/G 1 During the cycle 3 inspection (September 1985), defects were found in four row 1 U-bend tubes, and the conservative decision was made to preventively l
plug all row 1 tubes. During the cycle 3A inspection (March 1987), all row 1 tubes were deplugged, U-bend heat treated, and eddy current examined in the U-bend with the then state-of-the-art Combustion Engineering (CE) row 1 and 2 segmented bobbin coil probe. As a result of these examinations, five row 1 tubes were plugged with CE iron band plugs. During the cycle 3B inspection (July 1988), the CE 1ron band plugs were removed and replaced with Westinghouse plugs. Row 1 U-bends were examined with an enhanced Zetec MRPC, and as a result, four additional row 1 tubes were plugged with Westinghouse mechanical plugs. One tube (RIO C44) was preventively plugged and stabilized due to TVA's response to NRC Bulletin 88-02. A total of 10 tubes are presently plugged (refer to Table 7).
S/G 2 During the cycle 3 inspection (September 1985), all 94 row 1 tubes were preventively plugged. During the cycle 3A inspection (March 1987), all row 1 tubes were deplugged, U-bend heat treated, and eddy current examined with the then state-of-the-art CE segmented bobbin coil probe. As a result of the inspection, three tubes were plugged with CE iron band plugs. During the cycle 3B inspection (July 1988), the CE iron band plugs were removed and replaced with Westinghouse mechanical plugs. Row 1 U-bends were examined with an enhanced Zetec MRPC probe and as a result, seven additional row 1 tubes were plugged. A totel of 10 tubes are presently plugged (refer to Table 7).
S/G 3 During the cycle 3 inspection (September 1985), all 94 row 1 tubes were preventively plugged. During the cycle 3A inspection (March 1987), all row 1 tubes were deplugged, U-bend heat treated, and eddy current tested with the then state-of-the-art CE segmented bobbin coil probe. As a result of the inspection, three tubes were plugged with CE iron band plugs. During the cycle 3B inspection (July 1988), the CE iron band plugs were removed and replaced with Westinghouse mechanical plugs. Row 1 U-bends were examined with an enhanced Zetec MRPC probe, and as a result, 21 additional row 1 tubes were plugged. A total of 24 tubes are presently plugged (refer to Table 7).
TABLE 8'(CONTINUED)
SEQUOYAH UNIT 1 CYCLE 3B INSPECTION
' JULY 1988 PLUGGED TUBE
SUMMARY
S/G 4.
'During the cycle 3 inspection, all 94 row 1 tubes were preventively plugged.
During the' cycle 3A' inspection, all row 1 tubes were deplugged, U-bend' heat treated, and eddy current tested'with.the then state-of-the-art CE-segmented bobbin coil probe. As a result of the inspection, one row.1. tube was plugged with a CE iron band plug. During the cycle 3B inspection the CE iron band plug was removed and replaced with a Westinghouse mechanical plug. Row 1 .
U-bends were examined with an enhanced Zetec MRPC probe, and as a result, an additional 18' row 1 tubes were plugged. A total of.19. tubes are-presently plugged (refer to Table 7). l 1
l 1
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' TABLE 9 SEQUOYAH UNIT l' CYCLE 3B INSPECTION JULY 1988~
NOMENCLATURE Location. Nomenclature.for Seguoyah Nuclear Plant NOTATION DESCRIPTION HTE Hot tube end
. HTS Top of Tubesheet,- hot leg H01 First support plate - hot leg H02 .Second support plate - hot, leg.
H03 Third support plate - hot leg H04 Fourth support plate - hot leg H05 Fifth support plate.- hot leg HOG Sixth support plate - hot leg.
H07 Seventh support plate - hot leg avl- First anti-vibration bar above H07 AV2 Second anti-vibration bar above H07 AV3 Second anti-vibration bar above C07 AV4 First anti-vibration bar above C07 j C07 Seventh support plate - cold leg C06 Sixth support plate - cold leg C05 Fifth support' plate - cold leg .
C04 Fourth support plate - cold-leg l C03 Third support plate - cold leg CO2 Second support plate - cold leg C01 First support plate - cold leg CTS Top of Tubesheet - cold leg CTE Cold tube end MRPC Motorized Rotating Pancake Coil TSP Tube Support Plate l I
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