ML20237J416
| ML20237J416 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/29/1987 |
| From: | Tiernan J BALTIMORE GAS & ELECTRIC CO. |
| To: | Russell W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8708260155 | |
| Download: ML20237J416 (9) | |
Text
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4-BALTIMORE GASAND ELECTRIC CHARLES CENTER R O. BOX 1475 BALTIMORE, MARYLAND 21203 i
JOSEPH A.TIERNAN vies PResiocur NUCLEAR ENEROY May 29, 1987 c.
U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Mr. William T. Russell Regional Administrator
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit 2; Docket No. 50-318 Report of Steam Generator Tube Pluccing
REFERENCE:
(A) Technical Specifications, Calvert Cliffs Unit 2 ATTACHMENT:
(1) Tubes Plugged Steam Generator #21 (2) Tubes Plugged Steam Generator #22 (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 2 Steam Generators during the recent March / April 1987 Inservice Inspection.
Forty-three tubes were found to have service induced degradation which exceeded the Technical Specification plugging limit of 40% loss of nominal wall thickness, 29 in Steam Generator #21 and 14 in Steam Generator #22.
The inspection results on the initial Technical Specification sample selection required 100% of each Steam Generator's tubing to be inspected.
Indications of 20% through wall degradation or greater were found on a total of 176 tubes from the 17,008 tubes examined. As stated above, 43 of these indications exceeded the plugging limit of 40% loss of nominal wall. Additionally, 18 tubes, showing eddy current g\\
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i Mr. William T.' Russell May 29,:1987 Page 2 I
of less than 40% nominal'. wall l'oss, - were plugged.
For
~
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-indications:
l precautionary reasons, five of the -18 tubes were-plugged due to degradation at the upper. supports, which are' suspected to be wear.
t.
Twelve tubes were plugged due.to degradation above the tube sheet,.and-one,was plugged due to degradation at the first. support.. Metallurgical-examination of U-1 tubing has' shown that the degradation-above the tube i
. sheet'is caused by Intergranular Attack (IGA).
The indication at the first. support is suspected to be ICA, also.
j These 61 tubes were. removed from service by plugging the - hot and~ cold leg tube ends with mechanical plugs.
Attachments ' (1) - and -(2) list the tubes' plugged during the 1987. Unit 2
. Refueling Outage along. with the reason for plugging the tube'.
Attachment (3) is a' sketch indicating Steam Generator support locations j
l and nomenclature.
'Should you have further questions regarding this matter, please do not hesitate to contact us.
l' Very truly yours,
)
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JAT/JEM/j af Attachments
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D.A. Brune, Esquire J.E. Silberg, Esquire l
(S;A. McNeil,#NRC 1 j
T. Foley,-NRC p
R.A. Capra, NRC l
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' t Page 1 of 4 ATTACHMENT (1)
Steam Generator #21 Tubes Plugged During the' Unit 2 March 1987 Outage EDE 11HE REASON FOR PLUGGING 9
33 Eddy Current Testing Indication of 96% wall'
. loss-originating on the outside diameter of
'the tube at VM + 0.0 inches.
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14 156
' Eddy Current Testing Indication of 42% wall loss originating on the outside diameter of i
the tube at H4 + 35.7 inches.
.19 127 Eddy Current Testing Indication of 53% wall loss originating on the outside diameter of the tube at C5 + 10.2 inches.
'25
'157 Eddy Current Testing Indication of 46% wall loss originating on the outside diameter of the tube at H2 + 21.6 inches.
4 29 45 Eddy Current Testing Indication of 46% wall loss originating on the outside diameter of the tube at Cl + 14.1 inches.
29 139 Eddy Current Testing Indication of 74% wall loss originating on the outside diameter of l
the tube at HTS-SF + 0.6 inches.
29 143 Eddy Current Testing Indication of 48% wall loss originating on the outside diameter of the tube at HTS-SF + 0.6 inches.
46 128 Eddy Current Testing Indication of 48% wall loss originating on the outside diameter of i
the tube at HTS-SF + 0.6 inches.
54 136 Eddy Current Testing Indication of 69% wall loss originating on the outside diameter of the tube at HTS-SF + 0.5 inches.
68 122 Eddy Current Testing Indication of 56% wall loss originating on the outside diameter of the tube at HTS-SF + 0.4 inches.
71 115 Eddy Current Testing Indication of 47% wall
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loss originating on the outside diameter of the tube at HTS-SF + 0.4 inches.
J
I c,s Page 2 of 4 1
O ATTACHMENT (1)
I Steam Generator'#21 Tubes Plugged During the Unit 2 March 1987 Outage i
..EDy g}{g REASON FOR Pl.UGGING
.{
74-116-Eddy Current Testing Indication of 60% wall j
loss originating on the outside diameter of.
the tube at HTS-SF + 0.7 inches.
74
-120 Eddy Current. Testing Indication of 54% wall loss originating on the outside diameter of the tube at HTS-SF + 0.4 inches.
76.
122 Eddy Current Testing Indication of 49% wall loss originating on the outside diameter of the tube at HTS-SF + 0.5 inches.
80 114 Eddy Current Testing Indication of 49% wall loss originating on the outside diameter of the tube at HTS-SF + 0.6 inches.
81
.97 Eddy Current. Testing Indication of 61% wall loss originating on the outside diameter of the tube at HTS-SF + 0.8 inches.
85 51 Eddy Current Testing Indication of 40% wall loss originating on the outside diameter of the tube at C8 + 4.7 inches.
97 103 Eddy Current Testing Indication of 75% wall loss originating on the outside diameter of the tube at HTS-SF + 1.1 inches.
99 53 Eddy Current Testing Indication of 52% wall loss originating on the outside diameter of the tube at H2 + 1.5 inches.
112 102 Eddy Current Testing Indication of 43% wall loss originating on the outside diameter of the tube at C5 + 31.6 inches.
1
'116 120 Eddy Current Testing Indication of 42% wall loss originating on the outside diameter of the tube at CTS-SF + 1.9 inches.
120 58 Eddy Current Testing Indication of 44% wall loss originating on the outside diameter of the tube at H6 + 11.9 inches.
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l'e Page 3 of 41 1-ATTACHMENT (1) l
' Steam Generator #21 Tubes' Plugged During the-Unit 2 Harch 1987 Outage-
- ggg.
ggg
-. REASON FOR PLUGGING 1
122
'64' Eddy Current Testing Indication of 49% wall loss originating on the outside diameter of
'the tube at CTS-SF + 3.8' inches.
122 92 Eddy Current Testing Indication of 97% wall loss. originating on the outside diameter of.
the tube at HTS-SF + 1.8 inches.
.126
_108 Eddy Current Testing Indication of 87% wall
. loss originating on the outside diameter of the tube at H9 + 15.8 inches.
127-53 Eddy Current Testing Indication of 44% and 62% wall loss originating on the outside diameter of the tube at CTS-SF + 14.1 and CTS-SF + 14.4 inches, respectively, i
129 53 Eddy Current Testing Indication of 45% wall loss originating on the outside diameter of q
the tube at HTS-SF + 13.8 inches.
132 110-Eddy Current Testing Indication of 44% wall loss originating on the outside diameter of the tube at HTS-SF + 7.4 inches.
133 109
' Eddy Current Testing Indication of 53% wall j
loss originating on the outside diameter of the tube at HTS-SF + 6.7 inches.
14 28 Eddy Current Testing Indication of 27% wall loss originating on the'outside diameter of the tube at HTS-SF + 2.4 inches.
37 157 Eddy Current Testing Indication of 34% wall f
loss originating on the outside diameter of the tube at HTS-SF + 22.4 inches.
38.
32 Eddy Current Testing Indication of 39% wall l
loss originating on the outside diameter of l
the tube at HTS-SF + 1.0 inches.
40 32 Eddy Current Testing Indication of 33% wall loss originating on the outside diameter of the tube at HTS-SF + 0.9 inches.
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Page 4 of 4-
~ATTACRHENT (1)
Steam Generator #21 Tubes Plugged During the Unit 2 March 1987 Outage EQH LINE REASON FOR PLUGGING
'42
.36
. Eddy.. Current Testing Indication of 32% wall
' loss originating.on the~outside diameter of the tube at HTS-SF + 0.6 inches.
1 74 46 Eddy Current Testing Indication of 34% wall
^
loss originating on the outside diameter of the tube at VC + 0.0 inches.
88 90 Eddy Current Testing Indication of 36% wall loss originating on the outside diameter of-the' tube at HTS-SF +.1.1 inches.
'89 119 Eddy Current Testing Indication'of 28% wall loss originating on the outside' diameter of the tube at HTS-SF + 0.4 inches.
91 105 Eddy Current Testing Indication of 28% wall loss originating on the outside diameter of the tube at HTS-SF + 1.1 inches.
113 123 Eddy Current Testing Indication of 21% and l
l 27% wall loss originating on the outside diameter of the tube at CTS-SF + 0.9 and CTS-SF + 2.3-inches.
120 54 Eddy Current Testing Indication of 28% wall loss originating on the outside diameter of the tube at CTS-SF + 0.5 inches.
127 107 Eddy Current Testing Indication of 27% wall loss originating on the outside diameter of the tube at VH + 0.0 inches.
l I
l Page 1 of 2 ATTACHMENT (2)
Steam Generator #22 Tubes Plugged During the Unit 2 March 1987 Outage ROW LINE REASON FOR PLUCGING 7
59 Eddy Current Testing Indication of 61% wall loss originating on the outside diameter of the tube at Cl + 5.0 inches.
18 32 Eddy Current Testing Indication of 71% wall loss originating on the outside diameter of the tube at HTS-SF + 0.7 inches.
20 146 Eddy Current Testing Indication of 50% wall loss originating on the outside diameter of i
the tube at Cl + 12.8 inches.
31 121 Eddy Current Testing Indication of 46% wall loss originating on the outside diameter of the tube at C2 + 14.1 inches.
32 68 Eddy Current Testing Indication of 57% wall loss originating on the outside diameter of the tube at CTS-SF + 25.4 inches.
34 72 Eddy Current Testing Indication of 70% wall loss originating on the outside diameter of the tube at DC + 0.0 inches.
36 90 Eddy Current Testing Indication of 59% wall loss originating on the outside diameter of the tube at DC + 0.0 inches.
56 90 Eddy Current Testing Indication of 47% vall loss originating on the outside diameter of the tube at C3 + 21.3 inches.
76 88 Eddy Current Testing Indication of 48% wall loss originating on the outside diameter of the tube at HTS-SF + 1.5 inches.
)
81 85 Eddy Current Testing Indication of 65% wall loss originating on the outside diameter of the tube at DH + 0.0 inches.
82 96 Eddy Current Testing Indication of 43% wall loss originating on the outside diameter of the tube at HTS-SF + 0.5 inches.
Page 2 of 2.
NfTACHMENT (2)
Steam Generator #22 Tubes Plugged During the Unit 2 March 1987 Outage EQH LINE REASON FOR PLUGGING 97 67 Eddy Current Testing Indication of 42% wall loss originating on the outside diameter of the tube at C9 + 1.2 inches.
106 88 Eddy Current Testing Indication of 47% wall loss originating on the outside diameter of the tube at H7 + 22.9 inches.
117 47 Eddy Current Testing Indication of 46% wall loss originating on the outside diameter of the tube at HTS SF + 8.7 inches.
8 132 Eddy Current Testing Indication of 37% wall loss originating on the outside diameter of the tube at VM + 0.0 inches.
9 123 Eddy Current Testing Indication of 26% vall loss originating on the outside diameter of the tube at VM + 0.0 inches.
11 51 Eddy Current Testing Indication of 38% wall loss originating on the outside diameter of the tube at HTS-SF + 12.0 inches.
37 89 Eddy Current Testing Indication of 25% wall loss originating on the outside diameter of the tube at DH + 0.0 inches.
80 84 Eddy Current Testing Indication of 29% wall loss originating on the outside diameter of the tube at HTS-SF + 0.7 inches.
136 66 Eddy Current Testing Indication of 37% wall loss originating on the outside diameter of the tube at C1 + 0.0 inches.
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ATTACHMENT (3) l l
Steam Generator Drawing
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