ML20035D612
| ML20035D612 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/31/1993 |
| From: | Fenech R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20035D613 | List: |
| References | |
| NUDOCS 9304130325 | |
| Download: ML20035D612 (2) | |
Text
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Tennessee Valiev AJthonty. Post Offce Box 2000, Soddy-Daisy. Tennessoa 37379 2000 Robert A.Fenech vice FSemdent snauoyan Nuciear Plant March 31, 1993 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk
.f Washington, D.C. 20555 l
t i
Gentlemen:
?
In the Matter of
)
Docket No. 50-328 Tennessee Valley Authority
)
l SEQUOYAH NUCLEAR PLANT (SQN) - UNIT 2 - INSERVICE INSPECTION (ISI) 0F f
UNIT 2 STEAM GENERATOR (S/G) TUBES (UNIT 2 CYCLE 5 REFUELING OUTAGE)
{
As required by SQN Technical Specification (TS) Surveillance Requirement (SR) 4.4.5.5.b, enclosed are the results of the S/G tube ISI completed
.i for Unit.2 during the Unit 2 Cycle 5 refueling outage. The subject ISI i
was completed on April 19, 1992.
l The initial inspection samples in all four S/Gs were classified as Category C-2 (categories are defined in SR 4.4.5.2).
In S/Gs 1 and 4, the first expansion sample was classified as Category C-2.
In S/Gs 2 and
+
3, the first expansion sample was classified as Category C-2, while the second expansion sample (all remaining tubes) was classified as
'l Category C-1.
Table 6 in the enclosed report summarizes service-induced vall-lors indications, sample classification, and S/G inspection scope l
for the SQN Unit 2 Cycle 5 ISI.
TVA performed eddy current examinations such that the following total i
percentages of tubes were examined with bobbin coil probes full length, rotating pancake coil (RPC) at the hot-leg top-of-tubesheet (HTS), and RPC at the first hot-leg support plate (H01):
i Full Length SLG
__Embhin_.___
HTS RPC H01 RPC lop { Q l 51 percent 54 percent 9 percent 2
57 percent 100 percent 9 percent 3
42 percent 100 percent 6 percent 4
39 percent 42 percent 6 percent Vl 93o41g[
G
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.l U.S. Nuclear Regulatory Commission
]
Page 2 l
March 31.-1993 All Row 2 tube U-bends in each S/G were examined by RPC-(Row 1 tubes have.
~
been preventively plugged).
I As a result of these examinations, five tubes were plugged In S/G 1, nineteen tubes were plugged in S/G 2, twelve tubes in S/G 3, and two' tubes in S/G 4.
No commitments are contained in this submittal. Please direct questions concerning this issue to D. V. Goodin at (615) 843-7734.
j Sincerely, d
Wb Robert A. Fenech Enclosure
.i cc (Enclosure).
Mr. D. E. LaBarge, Project Manager U.S. Nuc. lear Regulatory Commission One White Flint, North 11555 Rockville Pike
.Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 r
U.S. Nuclear Regulatory Commission Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-0199 P
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