ML20235T248
| ML20235T248 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 10/02/1987 |
| From: | Morgan H SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8710090307 | |
| Download: ML20235T248 (12) | |
Text
_ _ _ _ _ _ - _ _ _
Southern California Edison Company SAN ONOFRE NUCLE AR GENER ATING ST ATION P. O BOX 128 SAN CLEMENTE, CALIFORNIA 92672 H E MORGAN M E N NE S TATK'N MANAG( R October 2, 1987 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.
20555 l
Subject:
Docket No. 50-362 i
Special Report - Inservice Inspection of Steam Generator Tubes l
San Onofre Nuclear Generating Station, Unit 3
Reference:
Letter from Mr. M. O. Medford (SCE) to Mr. G. W. Knighton (USNRC) dated April 5, 1985 Pursuant to Surveillance Requirement 4.4.4.5(b) of Appendix A, Technical Specifications to Facility Operating License NPF-15, this report is being submitted to the Commission following the completion of inservice inspection of steam generator tubes at San Onofre Unit 3.
Eddy current inspection of the steam generator tubing was completed on February 6, 1987. A total of 1117 tubes (6*J of the tubes in service) in two steam generators were inspected full length and 20 tubes were removed from service by mechanical plugging.
In Steam Generator E-088, 840 tubes were inspected. One tube, found to be defective due to the wear mechanism previously described in the reference, was plugged. Additionally, eight tubes with indications below the plugging limit, that were due to the wear mechanism previously described in the reference, were preventively plugged.
In Steam Generator E-089, 277 tubes were inspected. One tube, which exhibited l
degradation during the previous inspection in October 1985, was found to be defective.
This defective tube was plugged. A comparison of the eddy current results from the previous inspection and this inspection showed no growth of the flaw.
Therefore, as provided for in Technical Specification 4.4.4.2, no program expansion was necessary. Additionally, ten tubes with indications below the plugging limit, that were due to the wear mechanism previously described in the reference, were preventively plugged.
8710090307 871002
{DR ADOCK 05000362 h[
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Document Control Desk As required by Surveillance Requirement 4.4.4.5(b), complete results of the recently completed inservice inspection of steam generator tubing are provided in the enclosures. Enclosure 1 provides the steam generator internal location reference guide. The eddy current indication locations listed in.the remaining enclosures are based upon this guide.
Enclosures 2 and.4 provide a list of eddy current testing indications, including tube identification, indication depth, and the axial location of the indication in the tube.
Enclosures 3 and 5 provide a list of tubes plugged after completion of the inservice inspection.
If you require any additional information, please so advise.
Sincerely, M EM Q
Enclosures:
1 Combustion Engineering Model 3410 Steam Generator E-088 and E-089 Support Designation Guide and Illustrative Diagram 2
List of Eddy Current Indications, Steam Generator E-088 3
List of Tubes Plugged, Steam Generator E-088 4
List of Eddy Current Indications, Steam Generator E-089 l
5 List of Tubes Plugged, Steam Generator E-089 cc:
J. 8. Martin (Regional Administrator, USNRC Region V)
F. R. Huey (USNRC Senior Resident Inspector, Units 1, 2 and 3)
H. Rood (Project Manager, SONGS 2/3, USNRC, NRR)
Institute of Nuclear Power Operations (INPO)
t Page 1 of 2 i
COMBUSTION ENGINEERING MODEL 3410 -STEAM GENERATOR ILLUSTRATIVE DIAGRAM 4
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CLARIFICATION OF TUBING / SUPPORT INTERFACES ABOVE THE 7TH FULL EGGCRATE SUPPORT R0WS TUBING / SUPPORT INTERFACES 120-147 H8, H9, H10 DH, VH1, VH2, VH3, VM, VC3, VC2, VC1, DC, C10, C9, C8 115-119 H8, H9 DH, VH1, VH2, VH3, VM, VC3 VC2, VC1, DC C9, C8 2
84-114 H8, H9 DH VH2, VH3, VM, VC3, VC2 DC C9, C8 83 H8 DH VH2, VH3, VM, VC3, VC2 DC C8 51-82 H8 DH VH3, VM, VC3 DC C8 49-50 H8 DH VM DC C8 l
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LIST OF EDDY CURRENT. INDICATIONS I
San Onofre Unit 3 Steam Generator E-088 I
Row Column Indication (% through-wall)
Location 49 93 50 DH 42 96 43 DH 49 83 39 DC 47 93 38 DH 48 90 35 DH 1
98 152 34 C3 - 12.9 1
122 56 33 VH2 + 6.3 33 73 31 CTS + 2.3 43 103 30 C6 + 4.3 49 95 30 (Note (1))
C1 - 6.5 27 45 29 H2 + 25.6 7
47 28 DH 21 19 28 C2 + 5.1 37 75 28 VM 1.6 40 98 28 DH 45 99 27 DH 55 91 26 H5 + 10.8 5
117 25 (Note (1))
C2 - 10.5 138 90 25 C1 + 12.3 42 98 24 DH l
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44 82 24 VM I
51 85 24 C4 - 19.3 I
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Page 2 of 2 (Continued) l LIST OF EDDY CURRENT INDICATIONS l
San Onofre Unit 3 Steam Generator E-088 Row Column Indication (% through-wall)
Location 94 54 23 VH2 + 5.4 2
38 22 C3 q
35 101 21 DH 128 98 21 H1 + 25.5 125 91 20 H3 + 3.3 i
2 38
<20 C3 + 3.5 4
54
<20 C3 + 15.3 10 166
<20 HI - 5.1 11 173
<20 H4 + 23.3 20 68
<20 DC 39 99
<20 DH 46 84
<20 DC 46 90
<20 DC 46 100
<20 (Note (1))
VM + 17.7 48 88
<20 DC 52 92
<20 VC3 61 135
<20 (Note (1))
DH 106 28
<20 (Note (1))
C2 - 9.5 110 58
<20 H9 + 15.1 113 95
<20 (Note (1))
H1 + 18.9 116 80
<20 VC2 123 69
<20 H2 - 12.0 Note (1):
This indication originated from the tubing interior wall (inside diameter). All other indications originated from the tubing exterior wall (outside diameter).
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Page 1 of 1 LIST OF TUBES PLUGGED San Onofre Unit 3 Steam Generator E-088 Row Column Reason 49 93 50% indication at location DH 42 96 Preventive Maintenance 48 90 Preventive Maintenance 40 98 Preventive Maintenance 47 93 Preventive Maintenance 49 83 Preventive Maintenance 42 98 Preventive Maintenance 45 99 Preventive Maintenance 35 101 Preventive Maintenance 1
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Page 1 of 4 LIST OF EDDY CURRENT INDICATIONS San Onofre Unit 3 Steam Generator E-089 Row Column Indication (% through-wall)
Location 111 81 44 H7 + 25.7 140 96 42 C2 + 33.3 118 38 39 H8 + 10.9 115 103 36 H9 + 17.5 46 138 34 C5 + 11.1 120 54 33 H9 + 8.5 133 97 33 C6 + 13.7 39 155 30 C6 + 34.7 118 38 30 CTS + 19.5 117 131 29 H7 - 6.2 1
125 99 28 H4 + 28.2 i
138 94 28 HTS + 18.7 35 101 26 DH 4:
79 26 VM 45 79 26 DH 33 73 25 DH 123 77 25 C3 + 23.7 38 74 24 DH 43 95 24 DC 43 97 24 VM 103 65 24 HS + 3.7 104 36 24 C4 + 15.6 108 128 24 H5 + 20.1
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Page 2 of 4 (Continued)
LIST OF EDDY CURRENT INDICATIONS San Onofre Unit 3 Steam Generator E-089 Row Column Indication (% through-wall)
Location 111 81 24 VH3 135 57 24 VC1+ 10.3 120 110 23 H6 + 12.6 122 132 23 C4 + 25.7 131 101 23 H6 + 9.7 45 95 22 DH 136 120 22 C2 - 5.5 135 57 21 H9 + 13.5 30 4
20 C3 + 34.3 103 65 20 HS + 11.5 106 94 20 H8 + 12.0 32 104
<20 DC 33 103
<20 DH 35 75
<20 DH 39 77
<20 DC 41 79
<20 DH 42 78
<20 DH 42 96
<20 DH 42 164
<20 C3 - 9.8 43 79
<20 DH 43 81
<20 DH 43 81
<20 DC 44 76
<20 (Note (1))
HTS + 25.7 44 80
<20 DC L._
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LIST OF EDDY CURRENT INDICATIONS 4
San Onofre Unit 3 Steam Generator E-089 Ry Column Indication (% through-wall)
Location 45 93
<20 DC 46 84
<20 DH 46-96
<20 DH j
47 85
<20 DH 50 92
<20 DH 51 91
<20 DH 62 74
<20 H1 + 28.9 101 35
<20 H3 + 14.2 108 80
<20 H3 + 17.4 108 80
<20 H7 + 25.2 110 110
<20 H2 + 12.7 113 75
<20 H3 + 18.6 113 83
<20 H4 + 6.3 l
119 89
<20 H8 + 26.3 120 88
<20 H3 + 37.2 125 107
<20 VH2+ 7.7 127 101
<20 C7 + 1.4 129 103
<20 C4 - 10.5 129 103
<20 VC2-4.5 129 105
<20 H2 + 13.5 133 97
<20 C7 + 6.8 133 97
<20 C8 + 9.1 135 57
<20 VC1+ 24.2 135 87
<20 VH2+ 2.6
Page 4 of 4 (Continued) i LIST OF EDDY CURRENT INDICATIONS San Onofre Unit 3 Steam Generator E-089 Row Column Indication (% through-wall) location 135 87
<20 C8 + 21.9 135 101
<20 C5 - 11.9
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137 73
<20 C10- 15.5 138 96
<20 C5 + 8.1 139 85
<20 H9 + 20.5 1
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This indication originated from the tubing interior wall I
(inside diameter). All other indications originated from the tubing exterior wall (outside diameter).
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Page 1 of 1 I
I LIST OF TL3ES PLUGGED San Onofre Unit 3 Steam Generator E-089 Row Column Reason 111 81
'44% indication at location H7 + 25.7 35 101 Preventive Maintenance 50 92 Preventive Maintenance 43 95 Preventive Maintenance 38 74 Preventive Maintenance i
33 73 Preventive Maintenance 45 95 Preventive Maintenance 45 79 Preventive Maintenance 45 97 Preventive Maintenance 45 81 Preventive Maintenance 46 90 Preventive Maintenance I
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