ML20209G342

Forwards Table of 16 Affected Tube Locations in SG E089, Discovered During Cycle 10 Outage Insp,Which Were Probably Not Examined by Bobbin During Cycle Outage Insp

ML20209G342
Person / Time
Site:	San Onofre
Issue date:	07/15/1999
From:	Scherer A SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9907190128
Download: ML20209G342 (3)

Text

, SOUTHE RN CAtif ORNI A A. Edward Scherer EDISON - "=f-, m,,

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< July 15,1999 U. S. Nuclear Rego!atory Commission Document Control Desk Washington, D.C. 20555

Subject:

Docket No. 50-362 Update - Unit 3 Cycle 9 Steam Generator Inspection San Onofre Nuclear Generating Station, Unit 3

Reference:

(1) Letter from G. T. Gibson (SCE) to Document Control Desk (USNRC), "Special Report: Inservice inspection of Steam Generator Tubes, San Onofre Nuclear Generating Station, Unit 3",

Docket Number 50-362, January 23,1998 (2) Letter from A. E. Scherer (SCE) to Document Control Desk (USNRC), "Special Report: Inservice Inspection of Steam Generator Tubes, San Onofre Nuclear Generating Station, Unit 3",

Docket Number 50-362, April 28,1999 (3) Letter from A. E. Scherer (SCE) to Document Control Desk (USNRC), " Update - Unit 2 Cycle 9 Steam Generator inspection San Onofre Nuclear Generating Station, Unit 2", Docket Number 50-361, March 25,1999 Gentlemen:

During the Unit 3 Cycle 9 outage, Southern California Edison (SCE) completed an inspection of steam generator tubes at San Onofre Nuclear Generating Station, Unit 3.

In Reference 1, SCE reported that 100% of the tubes in Steam Generator E089 were examined by bobbin probe. During the Unit 3 Cycle 10 outage, SCE discovered the recorded data from the Cycle 9 outage for 16 tubes was incorrect.

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Document Control Desk July 15,1999 SCE now believes these tubes were probably not examined by bobbin during the Unit 3 Cycle 9 inspection. All 16 tubes were verified as no detectable discontinuity (NDD) or i were identified with less than .20% through-wall wear during the Unit 3 Cycle 10 inspection (Reference 2).

SCE previously informed the NRC that the Unit 2 Cycle 9 midcycle inspection results l had an error affecting 21 tubes (Reference 3). The Unit 2 Cycle 9 midcycle inspection error was discovered after completion of the Unit 3 Cycle 9 steam generator tube inspections. SCE's ongoing evaluation for Unit 2 will encompass this Unit 3 )

occurrence, and SCE will incorporate our findings into the applicable inspection i processes. A table of the 16 affected tube locations in Steam Generator E089 is l provided as an enclosure.

l' if you require any additional information, please contact myself or Mr. C. E. Williams at (949) 368-6707.

i Sincerely, Enclosure cc: E. W. Merschoff, Regional Administrator, NRC Region IV L. Raghavan, NRC Project Manager, San Onofre Units 2 and 3 j J. A. Sloan, NRC Senior Resident inspector, Units 2 and 3 j i

i Document Control Desk July 15,1999 i

Table 1. E089 Tube Locations with incorrect Recorded Data Tubc t.oc0 tion Row Column 41 47 43 47 45 47 47 47 49 47 51 47 53 47 55 47 j l

57 47 59 47 61 47  !

63 47 65 47 67 47 69 47 l

71 47 1

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