ML20211C272
| ML20211C272 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/15/1986 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8610210312 | |
| Download: ML20211C272 (7) | |
Text
.,,
.00T 15 086 Director of Nuclear Reactor Regulation Attention:
Mr. B. Youngblood, Project Director PWR Project Directorate No. 4 Division of Pressurized Water Reactors (PWR)
Licensing A-U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Youngblood:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 As required by the Sequoyah Nuclear Plant unit 1 technical specification 4.4.5.5.b, enclosed are the results of the steam generator tube inspection and.
tube plugging activities that were concluded on Octobec 12, 1985. Rcw 1 U-bend tubes with nonquantifiable wall-degradation are listed in tables 2, 3, 4, and 5 of the enclosure.
Initially, we elected to plug row 1 tubes that had exhibited any detectable degradation.
In addition to the row 1 tubes listed as plugged in tables 2, 3, 4, and 5, we further decided to preventively plug all row 1 U-bend tubes in the unit 1 steam generators to preclude the potential of primary-to-secondary leakage associated with row 1 U-bends.
In the future, we plan to reclaim the preventively plugged tubes by removing the plugs, heat treating the U-bend area of the tubes, and performing post heat treatment eddy current tests.
If you have any questions regarding this subject, please call M. J. Burzynski at 615/870-6172.
Very truly yours, TENNESSEE VALLEY AUTHORITY R. Cridley, rector Nuclear Safety and Licensing Sworn tognd subsce ed before me this h e day of 1986 (Po a d %. M &
Notary Public '
h My Commission Expires Enclosures cc:
See Page 2 8610210312 861015 PDR ADOCK 05000327 l
O PDR An Equal Opportunity Employer
,=
. Director of Nuclear Reactor Regulation DCT 15 XNN3 cc (Enclosures):
U.S. Nuclear Regulatory Commission Region II Attn:
Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Carl Stahle, Sequoyah Project Manager U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 Mr. G. G. Zech Director, TVA Projects U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
TABLE 1 SEQUOYAH UNIT 1 THII:D REFUELING OUTAGE 1985 i
STEAM GENERATOR INSPECTION
SUMMARY
I S/G 1
, S/G 2 S/G 3 S/G 4 Total Tubes Inspected 3388 3388 3388 3388 Tubes Suspect Pluggable Defects (2 40% wall loss) 4 0
0 0
Tubes Recording Degradation
( < 20% - < 40% wall loss) 2 1
1 1
Tubes Recording Imperfections j
( <20% wall loss) 9 14 11 10 t
i f
I J
P 0203P i
a y
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TABLE 2 SEQUOYAH UNIT 1 THIFO REFUELING OUTAGE 1985 STEAM GENERATOR 1 INSPECTION
SUMMARY
Tubes Inspected Full Length 3,294
-Noncode Inspections 94 Total No. Tubes Inspected 3,388 Tubes Suspect g40% Wall Loss Row Col Indication Location Disposition 1
16 APT R1 U-Bend Indication Plug 1
18 APT R1 U-Bend Indication' Plug 1
71 APT R1 U-Bend Indication Flug 1
81 APT R1 U-Bend Indication Plug J
Tubes Recording 20% <40% Wall Loss Row Col Indication Location Disposition 1
40 ID 32%
R1 U-Bend Indication Plug 1
1 OD 22%
HL-TS+17" 1981 TLBD Tubes Recording < 20% Wall Loss Row Col Indication Location Disposition 2.
44 (20%
HL-2 TSP +3" MFG. Imperfection 15 49
< 20%
HL-1 TSP Suspect (Monitor) 11 56
< 20%
HL-1 TSP +15" MFG. Imperfection 9
69 (20%
HL-1 TSP +33" MFG Imperfection 16 71
< 20%
HL-1 TSP +3.9" MFG. Imperfection 23 74 (20%
HL-2 TSP +35.9" MFG. Imperfection 23 83 (20%
HL-4 TSP +8.6" MFG. Imperfection l
l 1
90 (20%
HL-TS+17" 1981 TLBD 22
'9 (20%
CL-1 TSP +13.3" MFG. Imperfection l
0203P n
u,.
n n.
y-
TABLE 3 SEQUOYAH UNIT 1 THIRD REFUELING OUTAGE 1985 STEAM GENERATOR 2 INSPECTION
SUMMARY
Tubes Inspected Full Length 3,294 Noncode Inspections 94 Total No. Tubes Inspected 3,??8 Tubes Recording 20% (40% Wall Loss Row Col Indication Location Disposition 2
55 29%
CL-TS+29.5" MFG Imperfection Tubes Recording <t20% Wall Loss Row Col Indication Location Disposition 11 3
<20%
HL-7 TSP-93.0" MFG. Imperfection 11 10
<; 20%
HL-1 TSP +23.2" MFG. Imperfection 19 12
< 20%
HL-1 TSP +6.4"
-MFG. Imperfection 35 27
<t 20%
HL-TS+15.8" MFG. Imperfection 43 35
<t20%
HL-3 TSP +16.4" MFG. Imperfection 16 46
<20%
HL-2 TSP +38.4" MFG. Imperfection 39 50
<20%
HL-7 TSP +24.5" MFG. Imperfection 30 77
<t 20%
HL-3 TSP +1.8" MFG. Imperfection 11 93
<t20%
HL-4 TSP + 3 7. 3" MFG. Imperfection 6
2
< 20%
CL-TS+27.6" MFG. Imperfection 30 26 (20%
CL-2 TSP +10.00" MFG. Imperfection 43 35
<20%
CL-1 TSP +36.6" MFG. Imperfection 28 60
<20%
CL-1 TSP +19.1" MFG. Imperfection 10 93
< 20%
CL-2 TSP +45.3" MFG. Imperfection 0203P
TABLE 4 SEQUOYAH UNIT 1 THIRD REFUELING OUTAGE 1985 STEAM GENERATOR 3 INSPECTION
SUMMARY
Tubes Inspected Full Length 3,294 Noncode Inspections 94 Total No. Tubes Inspected 3,388
-Tubes Recording 20% (40% Wall Loss Row Col Indication Location Disposition 21 9
23%
HL-4 TSP +44.0" MFG. Imperfection Tubes Recording z20% Wall Loss Row Col Indication Location Disposition 12 25
<20%
HL-2 TSP +45.6" MFG Imperfections 4
40 30 (20%
HL-4 TSP-102" MFG. Imperfections 11 74
<20%
HL-6 TSP +7.5" MFG. Imperfections 11 88
<20%
HL-2 TSP +16.9" MFG. Imperfections 12 13
<20%
CL-3 TSP +33.0" MFG. Imperfections 17 40
<20%
CL-TS+3.6" MFG. Imperfections 13 54
<20%
CL-3 TSP +15.8" MFG. Imperfections 39 56
<20%
CL-TS+4.0" MFG. Imperfections 34 67
<20%
CL-2 TSP +14.7" MFG. Imperfections 20 87 (20%
CL-1 TSP +48.3" MFG. Imperfections 33 39 (20%
U-Bend Plug 0203P
=__
TABLE 5 SEQUOYAH UNIT 1 THIRD REFUELING OUTAGE 1985 STEAM GENERATOR 4 INSPECTION
SUMMARY
Tubes Inspected Full LenSth 3,294 Noncode Inspections 94 e
Total No. Tubes Inspected 3,388 Tubes Recording 20% <40% Wall Loss Row Col Indication Location Disposition 14 82 26%
CL-6 TSP +42.3" MFG. Imperfection Tubes Recording <20% Wall Loss Row.
Col Indication Location
-Disposition 40 28
<20%
HL-4 TSP +36.1" MFG. Imperfection 16 56 (20%
HL-STSP+32.3" MFG. Imperfection 41 61
< 20%
HL-2 TSP +48.1" Suspect (Monitor) 42 61
<20%
HL-2 TSP +38.7" Suspect (Monitor) 8 92
< 20%
HL-2 TSP +16.8" MFG. Imperfection 29 15
<20%
CL-4 TSP +13.7" MFG. Imperfection 28 53
< 20%
CL-6 TSP +11.7" MFG. Imperfection 40 69
<20%
CL-6 TSP +34.5" MFG. Imperfection 15 75
<20%
CL-1 TSP +9.0" MFG. Imperfection 11 82
<20%
CL-2 TSP +11.2" MFG. Imperfection 0203P
.. - - -, _, - - _, -