ML20236P921
| ML20236P921 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 10/27/1987 |
| From: | Withers B WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| WM-87-0280, WM-87-280, NUDOCS 8711190087 | |
| Download: ML20236P921 (6) | |
Text
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LF CREEK W8) NUCLEAR OPERATING Bart D. Withers President and CNet Executive Offeer October 27,.1987 WM 87-0280' U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Subj ect:
Docket No. 50-482:
Special Report 86-09 Gentlemen:
The attached Special Report 'is being submitted pursuant to Wolf. Creek Generating Station Technical Specifications 6.9.2 and.-4.4.5.5.b.
This report addresses the results of the-first Steam Generator Tube Inservice Inspection performed from October 19, 1986,. to October 27, 1986 during the first refuelir.g outage.
1 Very truly yours, j
-Bart D. Withsrs
~
. President and Chief Executive Officer' 1
BDW/jad Attachment
]
cc:
P. W. O'Connor (2)
R. D. Martin i
J. E. Cummins i
i
)
8711190087 871027 PDR ADOCK 05000482 s
G PDR
.fDdi P.O. Box 411/ Burhngton, KS 66839 / Phone: (316) 364-8831 An Equal Opportunay Employer WF/HC/ VET :
a--___-_--_--__
Attachment to WM'87-0280' Page' 1 of 5 October 27, 1987 MNE CREEK GDERATItU SIATION.
' SPECIAL REPORI' 86--009 RESULTS OF FI_RST STEAM GENERA'IOR TUBE INSERVICE INSPECTION ThisreportisbeingsubnittedpursuanttoTechnical' Specification (T/S)l.
4.4.5.5 and 6.9.2 to report the results of the first steam generator, tube inservice inspection.
The first steam generator. tube inservice inspection of steam generators.
(S/G) 'B' and 'C' was completed by Westinghouse Electric Corporation m.
October 27, 1986. The scope of the inspection enempassed"419 tubes (7.45%)
in S/G 'B' and 398 tubes (7.08%) in S/G
'C'.
Of the.419 tubesfinspected in S/G
'B', 393 were full length tests and 26 were U-bend tests. Of the 398 tubes inspected in S/G
'C',
384 were full length tests and.14 were U-beM tests. Full length inspections were tested frm'the hot leg sides. U-bend inspections were tested frm the top tube support plate.on the hot leg to the top tube support plate on the cold leg from the hot leg. side. No tube.
plugging was required or performed in either steam generator.
Analysis of the S/G 'B' inspection data revealed that' tube.55-62 had an irdication of 28% degradation on the cold leg side, and tube 47-99 had two '
indications of 21% and 25% degradation at two separate locations on the lot leg side. These tubes require reinspection during subsequent inspections of S/G 'B' per T/S 4.4.5.2.b.l.
Preservice inspection of tube 23-22.showed an indication of 20% degradation, while the. inservice! inspection revealed no detectable degradation (less than 20% degradation)., Reinspection'of this tube will be performed in future inspections'of S/Gl'B' to resolve this anmaly.
Analysis of the S/G 'C' inspection data revealed that tube 36-110.had two=
separate indications of 21% and 23% degradation"on the hot leg side..This tube requires reinspection during subsequent S/G 'C' inspections per T/S' 4.4.5.2.b.l.
No reportable indications were observed on the cold leg side.
Preservice inspection results of S/G
'B' and 'C' shosed five tubes with reportable indications. The following table shows these ' ive tubes with the f
percent degradation frm the preservice inspection (PSI) and the result of '
the inservice inspecticn (ISI).
S/G
2-19 25%
Unquantifiable-distorted. indication
. signal i-C 21-64 28%
PSI indication not i
found' C
56-77 28%
PSI indication not found' C
41-87 28%
No detectable
. degradation B
23-22
<20%
No detectable degradation
+
7 Attachment to WM 87-0280 Page 2 of 5 October 27, 1987 These tubes will be reinspected during subsequent inservice inspections of S/G B~ or C to resolve these ananalies.
Tables 1 and 2 show imperfections found during the tube insptd. ion for each of steam generators 'B' and
'C'.
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~ Attachment to WM 87-0280'
- Page 3'of-5;
- October 27, 1987-.
TABIE 1 SLDethRY OF 'IUBE INERFECTIONS IM S'IEPet GENERA'IOR 'B' NUMBER OF TUBES CONTAINING. IMPERFECTIONS IN STEAM' GENERATOR '.'B'.
113 J.NDICATION IN01(+)
- (% OF WALL (FROM.
ROW COIINN
' LEG
.: THICKNESS).-
IOCATION IOCATION).
(HOT LEG) 17
'6'
-H
<20'
-1 15.3-23 22 H
'DI-5
'O.0.
23 22 H.
INF 6'-
- 0. 0 -
29
' 42. -
H
'<20 7.
39.5.
56 82'-
H
<20'
'8 0.0 54 86 H'
<20' 8
' 0.0' 47 99 H'
21
.V4 0.0 47 99 H
26 V6 0.0 17 118 H
<20 7
26.2.'
17
'118 H'
NDD (COLD LEG)'
9 10 C
(20 1
.8.0 37 54 C
DI 5
~ 21.0 ;
55 62 C
28 2
23.2 55
- 62' C
<20 2
24.4' 55 62' c
<20
.2 24.9 57 70 C
<20 6'
0.0 57
,70 C
D-8 0.0 59 71 c
<20--
-.22.0 59 71' C'
D 8
0.0 13 114 C
<20-3-
20.0-j d
a-,
qy
,3 4
s 1
a 3
,]
fl i
.l
= 2, I'L
.: = =
.., r
[Attachmentto.WM 87-0280 Page 4cof 5-
]b October 27, 1987
);
'mBI.E 2 -
.a SG99daf OF '1UE IMPERFECTIGE FOR SIEAM GENERA 3DR 'C' "il
'1 NUMBER OF TUIES CONTAINING IMPERFECTIONS IN' STEAM GENERATOR C'
.17 O
, INDICATION-INCH (+)L
(% OF WALL (FNCH .
BOW '
COIINN IIII THICKNESS):
IDCATION <
. IIXATION).
(HOT LEG):
53 34 H-
,NDD.
53 34 H
.NDD 53'
'34 H
R UB-
'020
.3 e
25 42 H
DI 12- '
-30.2 45 66 H
<20
.7 23.6 I
53 70' H
DI 6
18.1 I
.t 56 77 H-INF 4
'7.0' 56 77 H
.UDS 4
- 11. 3 -
41 87 H
<20
=1 4.2.
36 110 H
'21 TH 0.0~
36 110 H
23-V3 0.0 -
28 115 H
DI LVl; 14.8-0 (COLD Iai) 2 19 C
DI 6
.38.9 53 33
'C UDS 7
- 16. 2 :.
45 38 C
<20 8
3.2' 45 38 C-
<20 8
3.7 17 56 C
<20:
4 5.7 17 62 C
<20 7
27.0 17 62 C
<20 7.
32.0' 21 64 C
INF-1 5.0 41 66 C
<20 8
0.0 49 66' C
<20-7-
30.5.
.33 98 C
lDI.
4
' 38.' 9
- 7 1
.i
I~
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9] j s
Attachment to WM 87-0280 Page 5 of 5 October 27,1987 IIIH24D RE TAnTFR 1 AND 2 DATA FTFTD CODES l
OoDe Im H-Hot leg C-Cold leg INDICATION ENTRIES 03DE INDICATION:
R-Restricted D-Dent DI - Distorted Indication-unquantifiable distorted indication signal UDS - Undefinable Signal-unclassifiable signal noted for future reference NDD - No Detectable Tube Wall Degradation (Indication)
INF - Indicaticn Not Found that was previously reported
<2D " Percent indication is less than 20%
NOTE: All defects are outer diameter in origin unless otherwise specified as inner diameter in origin.
Indication is defined as a signal depicting a tube wall loss condition.
Defect is defined as an indication that is pluggable based on a plugging limit or other established criteria.
LOCATION EtTfRIES l
1 QDE INDICATION:
UB - Area from top tube support plate hot leg to top tube support. plate
)
cold leg (U-Bend)
V1 - #1 Antivibration Bar l
l V2
- 2 Antivibration Bar l
l V3 - #3 Antivibration Bar
-l l
V4 - #4 Antivibraticn Bar V5 - #5 Antivibration Bar
.l V6 - #6 Ar.tivibratico Bar l
TH - Tangent Point Hold Leg Side
'IC - Tangent Point Cold leg Side 1, 2, 3, 4, 5, 6, 7, 8 - Tube Stpport Plate Ntmibers l
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