ML20116G648
| ML20116G648 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/01/1996 |
| From: | James Knubel GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20116G651 | List: |
| References | |
| 6710-96-2264, NUDOCS 9608080246 | |
| Download: ML20116G648 (1) | |
Text
l GPU Nuclear,Inc.
(
Route 441 South NUCLEAN Post Office Box 480 August 01, 1996 Middletown, PA i7057-0480 6710-96-2264 Tei717 944 7821 i
U. S. Nuclear Regulatory Commission Att: Document Control Desk Washington, DC 20555
Dear Sir:
-l
Subject:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR 50 Docket No. 50-289 Cycle 11 Refueling (11R) Outage Once Through Steam Generator (OTSG) Tube Inspection Report with ASME Form NIS-1 Covering the 11R OTSG Inservice Inspections l
Technical Specification 4.19.5.b requires submittal of the results from the OTSG tube inservice j
l inspections. Attachment 1, " Report on the 1995 Eddy Current Examinations of the TMI-l OTSG.
l Tubing," fulfills this requirement. Also included as Attachment 2 is the ASME form, "NIS-1 Owners Data Report for Inservice Inspections," covering the 11R OTSG examinations. Submittal of this form.
is required by the ASME Code,Section XI.
This report includes the results of examinations performed to fulfill GPU Nuclear commitments in our l
l response to Generic Letter (GL) 95-03, "Circumferential Cracking of Steam Generator Tubes." The j
11R examinations did not result in any indications of circumferential cracking or the axially oriented intergranular attack (IGA) as noted by another B&W plant licensee. Subsequent to the 11R Outage, l
another B&W plant licensee has discovered indications of axial cracking in an upper tube sheet roll expansion transition. Although similar indications have not been detected at TMI-1, to provide additional confirmation that this~ degradation mechanism is not active at TMI-1, GPU Nuclear is planning to examine the upper tube sheet (UTS) kinetic expansion transitions (KETs) for 21% of the tubes of both OTSGs during the next TMI-l refueling outage scheduled for September 1997.
c Sincerely, l}
i j
J.Knubel 090022 vice President and Director, TMi Attachments l
MRK L
cc: RegionI Administrator TMI Senior Resident Inspector TMI-l Senior Project Manager 9608080246 960801 PDR ADOCK 05000289-G PDR
.