ML20246D527
| ML20246D527 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 07/05/1989 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20246D531 | List: |
| References | |
| NUDOCS 8907110358 | |
| Download: ML20246D527 (2) | |
Text
. _ _ _ - _ _ _ _ _
~
TENNESSEE VALLEY AUTHORITY CH ATTANOOGA TENNESSEE 37401 5N 157B Lookout Place JUL 5 1989 i
I U.S. Nuclear Regulatory Commission i
ATIN: Document Control Desk Hashington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket No. 50-328 Tennessee Valley Authority SEQUOYAH NUCLEAR PLANT (SQN) UNIT 2 - INSERVICE INSPECTION (ISI) 0F UNIT 2 STEAM GENERATOR TUBES As required by SQN Unit 2 Technical Specification 4.4.5.5.b. enclosed are the results of the steam generator tube ISI completed for Unit 2 on February 27, 1989. No additional tubes were plugged during this inspection.
An ISI was performed on 204 tubes in steam generator 1 and 204 tubes in steam
. generator 4.
The ISI result category was classified by TVA as C-1.
Independent of the ISI, TVA performed a self-imposed eddy current examination of all nonplugged, peripheral tubes in all four steam generators and a 20 percent random sample in steam generators 1 and 4.
As a result of these examinations, antivibration bar wear was discovered in steam generators 1 and 3 (approximately 300 additional tubes were examined in both steam generators 1 and 3 to ensure bounding of the affected tubes).
Twelve tubes in steam generator I and one tube in steam generator 3 were affected.
Additionally, all row 2, inner radius U-bends in all steam generators were examined with an optimized probe design (motorized rotating pancake coll), and 50 rotating pancake coil examinations were performed on steam generator 2 at the top of tubesheet expansion / transitions.
TVA also performed examinations for the evaluation of SQN Unit 2 susceptibility to rapidly propagating fatigue cracks.
No commitments are contained in this submittal.
Please direct questions concerning this issue to K. S. Whitaker at (615) 843-7748.
Very truly yours, TENNESSEE VALLEY AUTHORITY h'
Manager,Nuc1[ar"[ Licensing p
j G
and Regulatory Affairs Enclosure p
cc:
See page 2 g
(\\
An Equal Opportunity Employer
~~
.i *.,
' 2-n
~
U.S. Nuclear Regulatory Commission JUI. 5 8 89 cc'(Enclosure):
Ms. S. C. Black, Assistant Director for Projects ~-
.TVA Projects Division U.S.; Nuclear Regulatory Commission
.One White Flint, North 11555 Rockville Pike 1
Rockville, Maryland. 20852-Mr. B. A. Wilson, Assistant Director for Inspection Programs TVA Projects Division-U.S. Nuclear Regulatory Commission l
Region II.
101 Marietta Street, NW, Suite 2900 Atlanta,. Georgia 30323
.NRC Resident Inspector.-
.Sequoyah Nuclear Plant.
2600 Igou Ferry Road Soddy. Daisy, Tennessee 37379 1
_ _ _ _ _ _ _