ML20205A814
| ML20205A814 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/25/1999 |
| From: | Scherer A SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9903310075 | |
| Download: ML20205A814 (3) | |
Text
NUM EDISON L'2 1 g m
$CUIH[RN Call!ORNIA A. Edward Scherer An LDISON INTLR%tTIONAL" Company March 25,1999 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-361 Update - Unit 2 Cycle 9 Steam Generator Inspection San Onofre Nuclear Generating Station, Unit 2
Reference:
(1)
Letter from 3. T. Gibson (SCE) to Document Control Desk (USNRC), "Special Report: Inspection of Steam Generator Tubes, San Onofre Nuclear Generating Station, Unit 2", Docket Number 50-361, February 20,1998 (2)
Letter from G. T. Gibson (SCE) to Document Control Desk (USNRC), " Updated Steam Generator Run Time Analysis for Cycle j
9, San Onofre Nuclear Generating Station, Unit 2", Docket N[
Number 50-361, May 26,1998 (3)
Letter from A. E. Scherer (SCE) to Document Control Desk (USNRC), "Special Report: Inspection of Steam Generator Tubes, San Onofre Nuclear Generating Stat:on, Unit 2", Docket Number 50-361, November 30,1998 (4)
Letter from A. E. Scherer (SCE) to Document Control Desk l
(USNRC), "Special Report: Inservice Inspection of Steam i
Generator Tubes, San Onofre Nuclear Generating Station, Unit 2",
Docket Number 50-361, February 9,1999 oAA0%9 9903310075 990325II PDR ADOCK 05000361 P
PDRh P. O. Ikix 128 San Clemente. CA 92674-0128 949-368-7501 rax 949-368 7575 L
Document Control Desk March 25,1999 During the Unit 2 Cycle 9 midcycle outage, Southern California Edison (SCE) completed an inspection of steam generator tubes at San Onofre Nuclear Generating Station, Unit 2. In References 1,2, and 3, SCE reported that 100% of the tubes in Steam Generator E089 were examined by bobbin probe. During the Unit 2 Cycle 10 outage, SCE discovered the recorded data from the cycle 9 midcycle outage for 21 tubes was incorrect.
SCE now believes these tubes were probably not examined by bobbin during the Unit 2 Cycle 9 midcycle inspection. All 21 tubes were verified as no detectable discontinuity (NDD) during the Unit 2 Cycle 10 inspection (Reference 4).
SCE is evaluating the cause of this error and will incorporate the findings into the applicable inn oction processes. Enclosed is a table of the 21 tube locations in Steam Generator E089 in question.
No similar instances were discovered for Unit 2 Steam Generator E088.
If you require any additional information, please contact myself or Mr. C. E. Williams at (949) 368-6707.
Sincerely, Enclosure i
cc:
E. W. Merschoff, Regional Administrator, NRC Region IV l
J. W. Clifford, NRC Project Manager, San Onofre Units 2 and 3 l
J. A. Sloan, NRC Senior Resident inspector, Units 2 and 3 l
l l
f
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Table 1. E089 Tube Locations with incorrect Recorded Data l
Tube Location i
Row Column 117 41 99 91 101 91 103 91 105 91 l
107 91 109 91 111 91 115 91 l
117 91 119 91 31 121 1
34 122 31 123 28 124 39 125 40 126 24 136 28 136 30 136 44 136 i
,