ML20212A113
| ML20212A113 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 02/21/1987 |
| From: | Tiernan J BALTIMORE GAS & ELECTRIC CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8703030291 | |
| Download: ML20212A113 (23) | |
Text
.
. s BALTIMORE GAS AND ELECTRIC l
CHARLES CENTER R O. BOX 1475 BALTIMORE, MARYLAND 21203 JostPH A.TIERNAN Vict PREstDENT NUCLEAR ENERGY February 12, 1987 U.S. Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Dr. Thomas E. Murley Regional Administrator
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit No. 1; Docket No. 50-317 Steam Generator Category C-3 Inspection Results Report
REFERENCE:
(a) Technical Specification 4.4.5.5.c, Calvert Cliffs Unit No. 1 i
j ENCLOSURES:
(1) Steam Generator Support Location and Nomenclature (2) Tubes Plugged Steam Generator #11 (3) Tubes Plugged Steam Generator #12 (4) Tube Sheet Maps Steam Generator #11 (5) Tube Sheet Maps Steam Generator #12 l
Gentlemen:
As required by Technical Specification 4.4.5.5.c, this letter provides a
description of investigations conducted to determine the cause of Calvert Cliffs Unit 1 Steam Generator tube degradation seen during the recent October 1986 Inservice Inspection and provide information about corrective measures l
taken to prevent recurrence.
l t
0703030291 870221
- g l
PDR ADOCK 05000317
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PDR i
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Dr. Thomas E. Murley February 12, 1987 Page 2 The initial eddy current testing plan for the October / November 1986 outage called for approximately 16% of the tubes in Steam Generators 11 and 12 to be inspected.
From this inspection plan 3% of the tubes in each Steam Generator were pre-selected as the Technical Specification population to which the inspection results classification rules would be applied.
Following analysis of the data from the Technical Specification sample the results were determined to be in Category C-3 and the requirement to expand the inspection to 100% was carried out for both Steam Generators.
l Thirty-two tubes were found to be defective, 21 in Steam Generator #11, and 11 in Steam Generator #12.
These tubes exceeded the plugging limit of 40% loss of nominal wall thickness.
Additionally, six tubes which showed eddy current indications of less than 40% nominal wall loss were plugged.
1 Four of these tubes were conservatively plugged due to degradation at supports, one tube was plugged due to an over expanded region above the tube sheet and one tube was plugged because a section containing <20% indications was removed for-metallurgical examination.
Enclosures 2 and 3 list each tube plugged and the reason for plugging. identifies the support location nomenclature used to identify NDE results relative to these tube locations.
The table on the following page is a summary of the 1986 Unit 1 inspection results.
Dr. Thomas E. Murley February 12, 1987 Page 3 S/G #11 S/G #12 Number of tubes Inspected 8,488 8,494 Percent of tubes Inspected 100%
100%
Number of Distorted Indications 35 25 Number of tubes with Distorted Indications 34 23 Percent of tubes with Distorted Indications 0.40%
0.27%
Number of Indications <20% (Imperfections) 132 132 Number of tubes with <20% Indications 96 106 Percent of tubes with <20% Indications 1.13%
1.25%
Number of Indications 20-39% (Degraded) 95 120 Number of tubes with 20-39% Indications 82 105 Percent of tubes with 20-39% Indications 0.97%
1.24%
Number of Indications >40% (Defective) 21 11 Number of tubes with >40% Indications 21 11 Percent of tubes with >40% Indications 0.25%
0.13%
Number of tubes Plugged this Outage 25 13 Total tubes Plugged 56 38 In addition to standard eddy current testing, some tubes were inspected using 8x1 contact probes, motorized rotating pancake
[
coil
- probes, narrow field bobbin coil
- probes, permanent magnetic suppression bobbin coil probes, and profilometry probes.
With the exception of profilometry these inspection methods were used to further quantify indications.
Profilometry was used to evaluate tube denting at the 9th and loth solid support plates.
Enclosures 4
and 5
contain various plots showing Steam Generator #11 and #12 eddy current indication locations.
All j
l l
c Dr. Thomas E. Murley February 12, 1987 Page 4 indications found were on the tube outside diameter.
The tube addy current indications can be placed into one of three major location categories:
o just above the top of the tube sheet, o
at supports, or in free span areas between and unassociated with supports'.
o It is apparent that the indications found just above the top of the tube sheet exist primarily in regions of higher sludge levels above the Steam Generator primary inlet side.
Those indications in this region above the outlet side also correspond primarily with higher sludge levels.
Most of these-indications produce relatively low magnitude signals.
Motorized rotating pancake coil data indicates that these indications are localized with respect to the circumference and do not have significant length.
Their geometry appears to be pit-like in nature.
Tube specimens containing these type of indications were removed from Steam Generator #11 and are undergoing metallurgical and chemical evaluations.
Eddy Current indications seen at support locations appear to be caused by tube wear.
One tube specimen containing an indication at a support was removed in November 1983.
Wear marks at support contact points were confirmed.
Note that most indications at supports occur at the vertical middle (VM) support and to a lesser degree at the diagonal (DH & DC) and vertical (VH & VC) hot and cold leg side supports.
Also note that there seems to be a higher occurrence of vertical middle support location indications between rows 9 and 11 inclusive.
Eddy Current indications seen in free span areas are typically low magnitude signals.
Specimens containing free span indications that were <20% were removed from one tube in November 1983.
Investigations of the free span indications l
l l
l
Dr. Thomas E. Murley February 12, 1987 Page 5 removed in 1983 were somewhat inconclusive and suggest that the indications were manufacturing imperfections, caused by false signals from deposits on the tube and/or shallow crystallographic wastage attack which may have occurred preservice or inservice.
Specimens from two tubes containing four free span indications were removed this outage for additional study.
It was noted that there seems to be no correlation of free span indications with respect to location, elevation, inlet side or outlet side.
Altogether portions of six tubes were removed from the inlet side of Steam Generator #11 during this inspection.
The tubes were selected from the 1986 eddy current inspection results with emphasis on the sludge pile region of the steam generator.
These tube samples are undergoing additional testing including metallurgical and chemical evaluations.
Corrective measures have been initiated to minimize further degradation to the Steam Generators.
During the 1986 Unit No.
1 outage we completed the removal of all major copper components from our feedwater and condensate systems.
We are completing installation of a nitrogen blanketing system on all condensate storage tanks to reduce auxiliary feedwater and condensate makeup oxygen.
We are evaluating use of morphline a
for minimizing the ingress of solids from the feedwater system into the Steam Generators and possible sludge pile cleaning or removal.
Modification of our current condensate precoat filters is scheduled for 1987-1988.
This in conjunction with our full flow deep bed condensate polishers will provide additional protection of our steam generators from impurity ingress from our condensers.
Our current chemistry procedures require notification and action to be taken below the SGOG PWR Secondary Water Chemistry Guideline Action Levels.
This enables us to take action before conditions become degraded in the Steam Generator.
During outages Steam Generators are kept in wet lay-up with a nitrogen blanket as much as possible.
i
Dr. Thomas E. Murley February 12, 1987 Page 6 With the results obtained from the metallurgical and chemical evaluations of the removed tube specimens, further chemical or operational controls will be implemented as recommended by the Steam Generator Owners Group to mitigate any further degradation to Steam Generator tubing.
Should you have any questions or require further information regarding this subject, please do not hesitate to call us.
Very truly yours, M
h JAT/JEM/cjp Enclosures cc:
D. A.
Brune, Esquire l
J.
E.
Silberg, Esquire S. A. McNeil, NRC A.
C. Thadani, NRC T.
Foley, NRC l
l Dr. Thomas E. Murley February 12, 1987 Page 7 bec: R. R. Allen /B. C. Rudell R. F. Ash /R.
C.
L. Olson M. E.
Bowman /L. E. Salyards P. T.
Crinigan C. H. Cruse /P.E. Katz R. E. Denton/J. A. Mihalcik R. M.
Douglass/S. E. Jones, Jr.
W. R. Horlacher, III R. E.
Lapp J. R. Lemons /R. P. Heibel W. J.
Lippold/A. R. Thornton J. E. Macklin P.
E. McGrane F. J. Munno R.
B. Pond /R. E. Cantrell/K.
L.
Cramblitt T. N. Pritchett/M. Gavrilas/E.
I.
Bauereis C. M. Rice L. B. Russell /J. T. Carroll R. G.
Staker T.
L.
Sydnor/O. P. Bulich i
s a==
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STEAM GENERATOR SUPPORT LOCATION AND NOMENCLATURE 6
l ENCLOSURE 2 Steam Generator #11 Tubes Plugged During the Unit 1 October 1986 Outage RQE LINE REASON FOR PLUGGING 1
121 Eddy Current Testing Indication' of 43% wall loss originating on the outside diameter of the tube at HTS-SF+ 2.8 inches.
1 123 Eddy Current Testing Indication of 52% wall loss originating on the outside diameter of the tube at CTS-SF+ 0.7 inches.
2 120 Eddy Current Testing Indication of 42% wall loss originating on the outside diameter of the tube at CTS-SF+ 2.3 inches.
l 2
122 Eddy Current Testing Indication of 55% wall loss originating on the outside diameter of the tube at CTS-SF+ 1.3 inches.
3 121 Eddy Current Testing Indication of 47% wall loss originating on the outside diameter of the tube at CTS-SF+ 1.6 inches.
11 153 Eddy Current Testing Indication of 43% wall loss originating on the outside diameter of the tube at VM+ 0.0 inches.
39 5
Eddy Current Testing Indication of 92% wall loss originating on the outside diameter of the tube at DC+ 0.0 inches.
51 57 Eddy Current Testing Indication of 43% wall loss originating on the outside diameter of the tube at HTS-SF+ 0.8 inches.
I 52 56 Eddy Current Testing' Indication of 46% wall loss originating on the outside diameter of j
the tube at HTS-SF+ 1.0 inches.
52 94 Eddy Current Testing Indication of 47% wall s
I, loss originating on the outside diameter of the tube at HTS-SF+
37.4 inches.
Removed i
section of tube from the HTS to 2" below the H2 support for metallurgical examination.
53 57 Eddy Current Testing Indication of 48% wall 4
i loss originating on the outside diameter of i
the tube at HTS-SF+
0.7 inches.
Removed section of tube from the HTS to 2"
below the H1 support for metallurgical examination.
l l
ENCLOSURE 2 (cont.)
Steam Generator #11 Tubes Plugged During the Unit 1 October 1986 Outage ROW LINE REASON FOR PLUGGING 72 82 Eddy Current Testing Indication of 48% wall loss originating on the outside diameter of the tube at HTS-SF+
0.8 inches.
Removed section of tube from the HTS to 2"
below the El support for metallurgical examination.
74 90 Eddy Current Testing Indication of 43% wall loss originating on the outside diameter of the tube at ETS-SF+
0.8 inches.
Removed section of tube from the HTS to 2" below the H1 support for metallurgical examination.
77 91 Eddy Current Testing Indication of 45% wall loss originating on the outside diameter of the tube at HTS-SF+
2.0 inches.
Removed section of tube from the HTS to 2"
below the H1 support for metallurgical examination.
101 27 Eddy Current Testing Indication of 72% wall loss originating on the outside diameter of the tube at C4+ 0.0 inches.
106 118 Eddy Current Testing Indication of 43% wall loss originating on the outside diameter of the tube at C7+ 15.0 inches.
114 62 Eddy Current Tescing Indication of 42% wall loss originating on the outside diameter of the tube at VM+ 0.0 inches.
137 67 Eddy Current Testing Indication of 51% wall loss originating on the outside diameter of the tube at CTS-SF+ 10.2 inches.
137 79 Eddy Current Testing Indication of 43% wall loss originating on the outside diameter of the tube at C10+ 7.6 inches.
139 73 Eddy Current Testing Indication of 74% wall loss originating on the outside diameter of the tube at HTS-SF+ 2.2 inches.
139 77 Eddy Current Testing Indication of 41% wall f
loss originating on the outside diameter of the tube at C2+ 1.1 inches.
I
,t.
e, ENCLOSURE 2 (cont.)
Steam Generator #11 Tubes Plugged During the Unit 1 October 1986 Outage ROW LINE REASON FOR PLUGGING 114 84 Eddy Current Testing Indication of 31% wall loss originating on the outside diameter of the tube at VH+ 0.0 inches.
Suspected wear indication.
5 11 163 Eddy Current Testing Indication of 36% wall loss originating on the outside diameter of the tube at VM+ 0.0 inches.
Suspected wear t
indication.
108 34 Eddy Current Testing Indication of 27% wall loss originating on the outside diameter of the tube at DH+ 0.0 inches.
Suspected wear indication.
70 28 Plugged because a
section of tubing was removed from the HTS to 2"
below the H3 support so metallurgical examination could be performed on two <20% indications.
4 1
+
ENCLOSURE 3 Steam Generator #12 Tubes Plugged During the Unit 1 October 1986 Outage ROW
'LINE REASON FOR PLUGGING 1
155 Eddy Current Testing Indication of 72% wall loss originating on the outside diameter of the tube at H4+ 35.9 inches.
S 9
.29 Eddy Current Testing Indication of 44% wall loss originating on the outside diameter of the tube at VM+ 0.0 inches.
21 161 Eddy Current Testing Indication of 45% wall loss originating on the outside diameter of the tube at H2+ 34.2 inches.
55 61 Eddy Current Testing Indication of 45% wall loss originating on-the outside diameter of the tube at HTS-SF+ 1.0 inches.
55 63 Eddy Current Testing Indication of 48% wall loss originating on the outside diameter of the tube at HTS-SF+ 0.7 inches.
58 60 Eddy Current Testing Indication of 48% wall loss originating on the outside diameter of the tube at HTS-SF+ 0.5 inches.
76 88 Eddy Current Testing Indication of 48% wall loss originating on the outside diameter of the tube at HTS-SF+ 2.8 inches.
i 78 92 Eddy Current Testing Indication of 45% wall loss originating on the outside diameter of the tube at HTS-SF+ 2.8 inches.
80 92 Eddy Current Testing Indication of 44% wall loss originating on the outside diameter of the tube at HTS-SF+ 0.7 inches.
94 66 Eddy Current Testing Indication of 44% wall loss originating on the outside diameter of the tube at VM+ 0.0 inches.
i 139 87 Eddy Current Testing Indication of 42% wall I
loss originating on the outside diameter of the tube at HTS-SF+ 21.0 inches.
I
' ENCLOSURE 3 (cont.)
Steam Generator #12 Tubes Plugged During the Unit 1 October 1986 Outage ROW LINE REASON FOR PLUGGING 47 161 Eddy Current Testing Indication of 38% wall loss originating on the outside diameter of the tube at DC+ 0.0 inches.
Suspected wear indication.
70 128 Plugged due to an over-expanded region that extended 24 inches above the hot tubesheet.
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ENCLOSURE 4 (cont.)
1986 STEAM GENERATOR #11 "O.D." INDICATIONS BETWEEN HTS-PF S Hi PLANT: CALVERT CLIFFS UNIT 1 GENERATOR-11 TOTAL TUBES:
8519 OUTAGE:
10/86 STAYS (9):
7 L = 0D - SPECIAL (0) 1 = CD - <20 (29) 2 = OD 29 (13) 3 = 00 39 (16) 4 = OD - >39 (5) m = MA.TIPLE IleICATION (13)
TOTAL TLBES ASSIGED:
76 180 OES g'
-14
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-130
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ENCLOSURE 4 (cont.)
1986 STEAM GENERATOR #11 "O.D." INDICATIONS BETWEEN CTS-PF S C1 PLANT: CALVERT CLIFFS UNIT 1 GEERATOR-11 TOTAL TIEES:
8519 OUTAGE:
10/86 STAYS (e):
7
- t. - m - specIAL to) s - oD - <ao en e - m - ao-as (a) 3 = 00 39 (2) 4 = 00 - >39 09 m = 84LTIPLE IpeICATION (0)
TOTAL 7 tees ASSIGB.D:
16 Ct1.D twedAY y
-14 3
-LN 130
-in
-130
-115
-ite
-105
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ENCLOSURE 4 (cont.)
1986 STEAM GENERATOR #11 "O.D." INDICATIONS at the YM SUPPORT PLANT: CALVERT CLIFFS UNIT 1 GEERATOR:
11 TOTAL TtBES-8519 OUTAGE:
10/86 STAYS (9):
7
- t. - m - specI n fo)
- ao - <ao a 2 - m - ao-a. m 3 30-39 (2) 4 = 0D - >30 (2) m = MLTIPLE IECATION fo) m a ness 4 I um 1 0 DES
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ENCLOSURE 5 cAverr ca.zrrs uuzT stese senereter : sa E
cavarr cLxpre imzt s steen seneretse : sa E
1986 HOT LES DEFECTS 3
1986 COLD LES DEFECTS 8
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caverr cLzrrs uuzT s stone emneestee : sa E
cavarr cLxpra unzT s stese emneretec : sa E
1986 HOT LES BEND E GION DEFECTS 8
1986 CDLD LES BEPO EGION DEFECTS a
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ENCLOSURE 5 (cont.)
1986 STEAM GENERATOR #12 "O.D." INDICATIONS ALL ELEVATIONS PLANT: CALVERT CLIFFS UNIT 1 GEMUIATOR:
$2 TOTAL TLBES:
8519 OUTAGE:
10/86 OUT OF SERVIN(f): 25 STAYS (9):
7 L = co - specIAL M i = 00 - 40 359 2 = C3 - 3D-8B (450 3 = co - so-as (dal 4 = co - >se 30 n - ms.72Pu! DcICATIow pal TOTAL TURES AARIS W R SEE too ces
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ENCLOSURE 5 (cont.)
1986 STEAM GENERATOR #12 "O.D.* INDICATIONS BETWEEN HTS-PF G Hi PLANT: CALVERT Ct.IFFS (MIT 1 GOERATOR-12 TOTAL TIBES:
8519 OUTAGE:
10/86 STAYS (t):
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