ML20151E518
| ML20151E518 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/14/1988 |
| From: | Tiernan J BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8807260104 | |
| Download: ML20151E518 (11) | |
Text
4 r-BALTIMORE GAS AND ELECTRIC CHARLES CENTER P. O. BOX 1475
- BALTIMORE, MARYLAND 21203 JOSEPH A.TIERNAN Vict PRESIDENT July 14, 1988 NucLEAn Eptmov U. S. Nuclear Regulatory Commission 1 White Flint North Floor P1 - Room 317 11555 Rockville Pike Rockville, MD 20850 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit 1; Docket No. 50-317 Report of Steam Generator Tube Plugging
REFERENCE:
(a)
Technical Specifications, Calvert Cliffs Unit l' ATTACHMENT:
(1)
Tubes Plugged Steam Generator #11 (2)
Tubes Plugged Steam Generator #12 (3)
Sketch of Steam Generator Support Locations Gentlemen:
As required by Technical Specification 4.4,5.5, this letter reports the number of tubes plugged in the Calvert Cliffs Unit 1 Steam Generators during the recent April through
- June, 1988 Inservice Inspect. ion.
Thirty-seven tubes were found to have indications which exceeded the Technical Specification plugging limit of 40% loss of nominal wall thickness. The cold leg side of one tube found to have been misplugged in Steam Generator #12 during the 1986 Outage was correctly plugged (see LER 317/88-03).
An additional 31 tubes were plugged as a preventative measure.
Of the total 69 tubes plugged during this Inservice Inspection 42 tubes were plugged in Steam Generator #11 and 27 tubes were plugged in Steam Generator #12.
Attachments (1) and (2) list the tubes plugged during the 1988 Unit 1 Refueling Outage along with the reason for plugging the tube.
Attachment (3) is a sketch indicating f0hq Steam Generator support locations and nomenclature.
1 \\
8807260104 800714
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PDR ADOCK 05000317 G
+
DOCUMENT CONTROL DESK July 14, 1988 Page 2 All of the tubes in service in each Steam Generator were examined.
The 100% inspection required a total of _ 16,94 5 tubes to be examined.
Of the 16,945 tubes examined, 315 tubes had indications of 20% through-wall degradation or greater.
As stated above, 37 of these indications exceeded the plugging limit.
Twenty-one tubes were plugged in Steam Generator #11 and 16 tubes were plugged in Steam Generator
- 12 for this reason.
As a
preventative
- measure, 31 additional tubes with indications in the sludge pile area were plugged.
Of these additional 31 tubes taken out of service, 21 were in Steam Generator #11 and 10 were in Stecm Generator #12.
Previous metallurgical examination of Unit 1
tubing has shown degradation in these areas was caused by Intergranular Attack (IGA).
Even though these 31 tubes had indications which were less than the plugging limit, the tubes were pluggcd because of the potential for a local active IGA mechanism.
As reported in LER 317/88-03, tube R94 L66 was found to have been misplugged on the cold leg s.4de of Steam Generator #12 during the 1986 Unit 1 Refueling Jutage.
The plug, intended for the cold leg side of tube R94 L66, was actually placed into adjacent tube R93 L67.
The cold leg tube end of R94 L66 was correctly plugged this outage and is included in the tubes plugged list.
Tube R93 L67 was inspected and has been analyzed to be acceptable for continued service with the one plug installed.
Should you have further questions regarding this matter, please do not hesitate to contact 1s.
Very truly yours, JAT:DVP:mic Attachments cc:
D.
A.
Brune, Esquire J,
E.
Silberg, Esquire W.
T. Russell, NRC R. A.
Capra, NRC S. A. McNeil, NRC D.
C. Trimble, NRC T.
Magette, DNR
I Pcga 1 of 5 1
ATTACHMENT (1)
Steam Generator #13 Tubes Plugged During the April 1988 Outage:
EQH LINE REASON FOR PLUGGING 11 147 Eddy Current Testing Indication of 57%
wall loss originating on the outside diameter of the tube at DH+2.10 inches.
27 33 Eddy Current Testing Indication of 59%
wall lose originating on the outside diameter of the tube at C2+33.80 inches.
45 51 Eddy Current Testing Indication of 48%
wall loss originating on the outside diameter of the tube at HTS-SF+0.76 inches.
45 55 Eddy Current Testing Indication of 52%
wall loss originating on the outside diameter of the tube at HTS -S I'+ 1. 0 3 inches.
50 16 Eddy Current Testing Indication of 47%
wall loss originating on the outside diameter of the tube at H4+8.57 inches.
54 58 Eddy Current Testing Indication of 64%
wall loss originating on the outside diameter of the tube at HTS-SF+0.64 inches.
55 57 Eddy Current Testing Indication of 48%
wall loss originating on the outside diameter of the tube at HTS-SF+0.82 inches.
69 93 Eddy Current Testing Indication of 61%
wall loss originating on the outside diameter of the tube at HTS-SF+1.10 inches.
70 92 Eddy Current Testing Indication of 48%
wall loss originating on thc outside diameter of the tube at HTS-SF+0.80 inches.
71 83 Eddy Current Testing Indication of 44%
4 wall loss originating on the outside diameter of the tube at HTS-SF+0.70 inches.
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Paga 2 of 5 A'ITACHMENT (1)
Steam Generator ill Tubes Plugged During the April 1988 Outage:
EQN LINE REASON FOR PLUGGING 73 89 Eddy Current Testing Indication of 47%
wall loss originating on the outside l
diameter of the tube at HTS-SF+0.50 inches.
74 86 Eddy Current Testing Indication of 49%
wall loss originating on the outside diameter of the tube at HTS-SF+0.60 inches.
74 92 Eddy Current Testing Indication of 62%
wall loss originating on the outside diameter of the tube at HTS-SF+0.60 inches.
75 85 Eddy Current Testing Indication of 46%
wall loss originating on the outside diameter of the tube at HTS-SF+0.70 inches.
75 93 Eddy Current Testing Indication of 41%
wall loss originating on the outside diameter of the tube at HTS-SF+2.80 inches.
77 89 Eddy Current Testing Indication of 43%
wall loss originating on the outside diameter of the tube at ETS-SF+1.80 inches.
78 88 Eddy Current Testing Indication of 42%
wall loss originating on the outside diameter of the tube at HTS-SF+1.40 inches.
103 125 Eddy Current Testing Indication of 54%
i wall loss originating on the outside diameter of the tube at VH+0.00 inches.
134 108 Eddy Current Testing Indication of 48%
wall loss originating on the outside diameter of the tube at HTS-SF+12.60 inches.
136 68 Eddy Current Testing Indication of 56%
wall loss originating on the 'outside diameter of the tube at CTS-SF+10.60 inches.
1
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Paga 3 of 5 ATTACHMENT (1)
Steam Generator fil Tubes Plugged During the April 1988 Outage:
E7d LINE REASON FOR PLQCfilHG 138 76 Eddy Current Testing Indication of 48%
wall loss originating on the outside diameter of the tube at CTS-SF+11.00 inches.
31 135 Eddy Current Testing Indication of a
bulge above the tubesheet from CTS-SF+0.00 inches to CTS-SF+23.70 inches.
46 52 Eddy Current Testing Indication of 38%
wall loss originating on the outside diameter of the tube at HTS-SF+2.20 inches.
50 56 Eddy Current Testing Indication of 23%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+0.64 inches.
51 111 Eddy Current Testing Indication of 39%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+0.80 inches.
j 52 58 Multiple Eddy Current Testing Indica-tions of 22%, 12%
and 16%
wall loss originating on the outside diameter of the tube at HTS +SF+2.55,+1.79 and
+1.09 inches, respectively.
52 110 Eddy Current Testing Indication of 23%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+0.70 inches.
54 56 Eddy Current Testing Indication of 37%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+0.64 inches.
54 110 Eddy Corrent Testing Indication of J4%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+0.80 inches.
Pags 4 of 5 ATTACHMENT (1)
Steam Generator (11 Tubes Plugged During the April 1988 Outage:
RQH Z id REASON FOR PLUGGING 56 58 Eddy Current Testing Indication of 35%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+0.79 inches.
57 109 Eddy Current Testing Indication of 17%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+2.70 inches.
59 57 Eddy Current Testing Indication of 38%
wall loss originating on the outside diameter of the tube at HTS-SF+1.20 inches.
56 62 Eddy Current Testing Indication of a
bulge above the tubesheet from HTS-SF+0.00 inches to HTS-SF+2.00 inches.
69 85 Eddy Current Testing Indication of 38%
wall loss originating on the outside diameter of the tube at HTS-SF+1.70 inches.
71 89 Multiple Eddy Current Testing Indica-tions of 35% and 31% wall loss originat-ting on the outside diameter of the tube at HTS-SF+0.90 and
+0.60
- inches, respectively.
71 93 Multiple Eddy Current Testing Indica-tions of 31%,
28%
and 23%
wall loss originating on the outside diameter of the tube at HTS-SF+1.10, +1.80 and +0.60 inches, respectively.
72 90 Multiple Eddy Current Testing Indica-tions of 38% and 34% wall loss originat-ing on the outside diameter of the tube at HTS-SF+0.60 and
+1.20 inches
]
respectively.
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1
Pcgo 5 of 5 ATTACHMENT (1)
Steam Generator #11 Tubes Plugged During the April 1988 outage:
RQH LINE REASON FOR PLUGGING 74 88 Eddy Current Testing Indication of 23%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+1.00 inches.
79 89 Eddy Current Testing Indication of 31%
wall loss originating on the outside diameter of the tube at HTS-SF+1.70 inches.
138 68 Eddy Current Testing Indication of 36%
wall loss originating on the outside diameter of the tube at CTS-SF+10.40 inches.
139 75 Eddy Current Testing Tube Sheet Crevice Squirrel (SQR) Indication showing wall loss originating on the outside diameter of the tube at HTS-SF-2.00 inches.
139 87 Eddy Current Testing Tube Sheet Crevice SQR Indication showing wall losc origi-nating on the outside diameter of the tube at HTS-SF-1.00 inches.
. ~.. _, --
Page 1 of 3 ATTACHMENT (2)
Steam Generator $12 Tubes Plugged During the April 1988 Outage:
EQN LINE REASON FOR PLUGGING 45 Eddy Current Testing Indication of 49%
wall loss originating on the outside diameter of the tube at CTS-SF+0.50 inches.
31 41 Eddy Current Testing Indication of 47%
wall loss originating on the outside diameter of the tube at HTS-SF+0.70 l
inches.
32 40 Eddy Current Testing Indication of 42%
wall loss originating on the outnide i
diameter of the tube at HTS-SF+0.70 inches.
l 61 65 Eddy Current Testing Indication of 42%
wall loss originating on the outside diameter of the tube at HTS-SF+0.70 inches.
61 105 Eddy Current Testing Indication of 49%
wall loss originating on the outside diameter of the tube at HTS-SF+1.00 inches.
70 84 Eddy Current Testing Indication of 45%
wall loss originating on the outside
)
diameter of the tube at HTS-SF+0.70
'nches.
I 70 96 Eddy Current Testing Indication of 644 waI A loss originating or the outside diameter of the tube at HTS-SF+0.70 inches.
71 97 Eddy Current Testing Indication of 47%
vall loss originating on the outside diameter of the tube at ETS-SF+0.50 inches.
73 93 Eddy Current Testing Indication of 54%
vall loss originating on the outside diameter of the tube at HTS-SF+0.70 inches.
74 96 Eddy Current Testing Indication of 45%
wall loss originating on the outside diameter of the tube at HTS-SF+0.60 inches.
I
Pcgn 2 of 3 ATTACHMENT (2)
Steam Generator (12 Tubes Plugged During the April 1988 Outage:
EQH LINE REASON FOR PLUGGING 75 95 Eddy Current Testing Indication of 67%
wall loss originating on the outside diameter of the tube at CTS-SF+0.70 inches.
76 92 Eddy Current Testing Indication of 53%
wall loss originating on the outside diameter of the tube at HTS-SF+0.60 inches.
77 85 Eddy Current Testing Indication of 52%
wall loss originating on the outside diameter of the tube at HTS-SF+2.70 inches.
77 89 Eddy Current Testing Indication of 43%
wall loss originating on the outside diameter of the tube at HTS-SF+2.20 inches.
78 86 Eddy Current Testing Indication of 44%
wall loss criginating on the outside diameter of the tube at HTS-SF+0.60 inches.
78 90 Eddy Current Testing Indication of 47%
wall loss originating on the outside diameter of the tube at HTS-SF+1.30 inches.
)
1 94 66 Cold leg side plugged.
Cold leg tube I
plug found to have been installed into
{
adjacent tube (R93 L67) during the 1986 l
Refueling Outage on Unit 1.
See LER I
317/88-03.
10 108 Eddy Current Testing Indication of 38%
wall loss originating on the outside diameter of the tube at HTS-SF+0.80 inches.
56 108 Eddy Current Testing Indication of 31%
wall loss originating on the outside diameter of the tube at HTS-SF+1.40 inches.
60 58 Eddy Current Testing Indication of 16%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS SF+0.60 inches.
v Pags 3 of 3 ATTACHMENT (2)
Steam Generator #12 Tubes Plugged During the April 1988 Outage:
EQH LINE REASON FOR P WGGING 68 74 Eddy Current Testing Indication of 38%
wall loss originating on the outside diameter of the tube at HTS-SF+1.20 inches.
73 97 Multiple Eddy Current Testing Indica-tions of 39%,
19%
and 36%
wall loss originating on the outside diameter of the tube at HTS-SF+1.70,
+1.10, and
+0.50 inches, respectively.
73 99 Eddy Current Testing Indication of 26%
wall loss originating' on the outside diameter of the tube at HTS-SF+1.10 inches.
74 86 Eddy Current Testing Indication of 38%
1 wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+1.40 inches.
74 94 Multiple Eddy Current Testing Indica-tions of 33%,
28%, and 13%
wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+1.40,
+1.10, and
+0.50
- inches, respectively.
76 90 Eddy Current Testing Indication of 28%
wall loss with high voltage signal originating on the outside diameter of the tube ut HTS-SF+1.50 inches.
81 91 Multiple Eddy Current Testing Indica-tions of 10% and 19% wall loss with high voltage signal originating on the out-side diameter of the tube at HTS-SF+1.50 and +0.50 inches, respectively.
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