ML20236K974
| ML20236K974 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/30/1987 |
| From: | BALTIMORE GAS & ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20236K892 | List: |
| References | |
| NUDOCS 8708100078 | |
| Download: ML20236K974 (29) | |
Text
{{#Wiki_filter:1 ENCLOSURE (1) j 1 1 1 I Calvert Cliffs Nuclear Power Plant l Steam Generator (21 and #22 i Category C-3 Report I The initial eddy current (ET) testing plan for the March / April j 1987 outage called for approximately 19% of the tubes in Steam Generators 21 and 22 to be inspected. From this inspection plan, 3% of the tubes in each Steam . Generator (S/G) 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 S/G's. All tubes were inspected ! through their entire length. l l Indications were found in a total of 177 tubes'from the 8,497 tubes examined in S/G 21 and 126 tubes from the 8,511 tubes examined in S/G 22. Forty-three tubes were found to be defective, 29 in S/G 21 and 14 in S/G 22. These tubes exceeded the plugging limit of 40% loss of nominal wall thickness. Additionally, 18 tubes which showed eddy current indications of less than 40% nominal wall loss were plugged for precautionary reasons. These 18_ tubes consisted of five tubes with indications at the upper supports, twelve tubes with indications within the tube sheet sludge area, and one ; indication at the first support. Degradation at the ' upper ! support locations are suspected to be from wear. This is based on one tube previously removed from Unit 1. I Metallurgical examination of Unit 1 tubing has shown.that the { degradation in the tube sheet sludge area is caused by Intergranular Attack (IGA). The one indication at the first support is also suspected to be IGA. i 8708100073 870730 PDR ADOCA0500g8 G
PAGE 2 The following is a summary of the Unit Two 1987 inspection: ! S/G #21 S/G #22 Number of Tubes Inspected 8,497 8,511 Percent of Tubes Inspected 100% 100% Number of Distorted Indications 22 35 Number of Tubes with Distorted Indications 19 34 Percent of Tubes with Distorted Indications 0.22% 0.39% l Number of Indications <20% (Imperfections) 92 71 Number of Tubes with <20% Indications 84 62 Percent of Tubes with <20% Indications 0.99% 0.73% f Number of Indications 20-39% (Degraded) 88 65 Number of Tubes with 20-39% Indications 78 55 Percent of Tubes with 20-39% Indications 0.92% 0.65% Number of Indications >39% (Defective) 30 14 l Number of Tubes with >39% Indications 29 14 I Percent of Tubes with >39% Indications 0.34% 0.16% Number of Tubes Plugged this Outage 41 20 f l Total Tubes Plugged each Steam Generator 63 28 l NOTE: Tubes, which contained more than one indication in more than one category (<20%, 20-39%, and 40% I and greater), are listed in all appropriate categories. , i l i i l 1 i l l i I - - _ _ _ a
A N e PAGE 3 I ! In addition to our standard bobbin ET testing, some tubes werb l inspected using an 8x1 contact coil probe and ET profilometry probe. The 8xl contact probe inspection method was used to further quantify some of the indications within the tube sheet sludge area. Profilometry was used to evalutate tube denting i at the 9th and loth solid support plates. Appendix I and II contain final ET inspection results and Various plots showing S/G's 21 and 22 ET indication locations. h All indications found were on the tube outside diameter (OD) with the exception of 4 inside diameter (ID), all less than 20% through wall, in S/G 22. The ET indications can be placed into one of three major location catgegories:
- just above the top of the tube sheet 1
- at the supports, or
- in the free span areas between and not associated with supports (includes the ID indications in S/G 22)-
! These inspection results are similar to that reported for l Calvert Cliffs Unit 1. There are no apparent differences l l between Unit 1 and Unit 2 that indicate unique phenomenon l occurring on any particular S/G. One would expect this to be ! the case since operating and chemistry conditions have ! remained similar between the two plants. It is apparent that the indications found just above the top of the tube sheet, for the most part, are in regions of higher sludge levels. Most of these indications are on the inlet tube sheet side. Most of these indications produce relatively lcw magnitude signals. Tube specimens containing these type of indications were removed from Unit l's S/G 11 and have undergone metallurgical and chemical evaluations. Results show that these indications are caused by intergranular attack (IGA). ' l ET indications seen at support locations appear to be caused l by tube wear. Wear marks were confirmed at one tube's support contact region removed in 1983 from Unit l's S/G 11. Note that most indications at supports occur at the vertical middle l (VM), diagonal (DH & DC), and vertical (VH & VC) hot and cold leg side supports. 1 i
I l 1 i PAGE 4 j
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ET indications seen in free span areas are typically low magnitude signals. Three tube specimens containing free span indications were removed from Unit l's S/G 11, one in November 1983 and two in November 1986. Investigations _ of the free span indications showed these indications to be manufacturing imperfections. It was noted there seems to be no correlation of free span indications with respect to location, elevation, inlet side or outlet side. , The extent of the tube degradation determined destructively I and the ET data analysis was found to be in good agreement. data was reanalyzed using digital analysis l Previous ET determine
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l equipment and current day methodologies to l quantitative changes in corrosion rate with time. The data l I suggests the IGA initiated in earlier years of operation, but { the present growth rate has slowed. The decreased corrosion . ,s rate is probably due to improved chemistry practices being utilized today. ( Corrective measures have been initiated to further minimize degradation to the S/G's. During the 1984 Unit 2 outage ] we completed the removal of all major copper components from ! cur feedwater and condensate systems. We have completed ) installation of a nitrogen blanketing system on all condensate i storage tanks to reduce auxiliary feedwater and condensate makeup oxygen. We are evaluating use of morpholine for i minimizing the, ingress of solids from the feedwater system l into the S/G's and possible sludge pile cleaning or removal. l, Modification of our current condensate precoat filters is scheduled for 1987-1988. This work, in conjunction with our full flow deep bed condensate polishers, will provide additional protection of our S/G's from condenser impurity 1 ingress. Our current chemistry procedures require notification and action to be taken below the S/G Reliability Program (SGRP) PWR Secondary Water Chemistry Guideline Action Levels. . This enables us to take action before chemistry conditions become degraded in the S/G's. During outages Steam Generators are kept in wet lay-up with a nitrogen blanket as much as possible.
\. i l i f I l ( I APPENDIX I - Inspection Results for S/G 21 A. Tube Sheet Maps S/G 21 l l B. Tubes Plugged S/G 21 l l l i l
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Page 1 of 4 S eam Generator #21 Tubes Plugged During the Uni: 2 March 1987 Ou: age ROW LIEE REASON FOR PLUGGING 9 33 Eddy Current Testing Indication of 96% wall l' loss originating on the outside diameter of the tube at VM + 0.0 inches. 14 156 Eddy Currene Testing Indication of 42% wall I loss originating on the outside diameter of the tube at H6 + 35.7 inches. 19 127 Eddy current Testing Indication of 53% vall loss originating on the outside diameter of l' the tube at C5 + 10.2 inches. 25 157 Eddy Curren: Testing Indication of 46% wall loss origina:ing on the outside diameter of f the tube at H2 + 21.6 inches. I 29 45 Eddy Curren: Testing Indication of 46% wall j loss originating on the outside diameter of the tube at C1 + 14.1 inches. l 29 139 Eddy Curren: Testing Indication of 74% wall l loss originating on the outside diameter of I che tube at HTS-SF + 0.6 inches. 29 143 - Eddy Curren: Testing Indication of 48% wall loss originating on the outside diameter of the tube a: HTS-SF + 0.6 inches. 46
.128 Eddy Curren: Testing Indicacion of 48% wall loss originatin5 on the outside diameter of l the tube at HTS SF + 0.6 inches.
54 136 Eddy Curren: Testing Indication of 69% wall loss originating on the ou: side diameter of the tub e a t HTS - S F + 0. 5 inche s . 68 122 Eddy Curren: Tes:ing Indication of 56% wall loss origina:ing en the outside diameter of the tube at HTS-SF + 0.4 inches. 71 115 Eddy Curren: Tes:in5 Indication of 47% wall loss originating on the outside dia=ecer of the tube at HTS ST + 0.4 inches.
9 Fage 2 of 4 Steas Genera:or =21 Tubes Plugged During the Uni: 2 March 1987 Outage ROU LI,3 REASON FOR PLUCGING 74 116 Eddy Current Testing Indication of 60% wall loss originating on the outside diameter of , the tube at HTS-SF + 0.7 inches. 74 120 Eddy Current Testing Indication of 54% vall loss originating on the outside diameter of the tube at HTS-SF + 0.4 inches. 76 122 Eddy Current Testing Indication of 49% vall loss originating on the outside diameter of the tube at HTS-SF + 0.5 inches. 80 lla Eddy Curren Testing Indication of 49% wall loss originating on the outside dia=e:er of the tube at HTS-SF + 0.6 inches. i i 81 97 Eddy Curren: Testing Indication of 61% vall loss originating on the outside diameter of the tube at HTS-SF + 0.8 inches. ; 85 51 Eddy Curren: Testing Indication of 40% vall loss originating on the outs? de diameter of the tube a: CS + 4.7 inches. 97 103 - Eddy Curren: Testing Indication of 75% wall loss ori 5ina:ing on the outside diameter of the tube a: HTS-SF + 1.1 inches. 99 53 Eddy Carren: Testing Indication of 52% wall I loss originating on the outside diameter of the tube a: H2 + 1.5 inches. I 112 102 Eddy Curren: Testing Indication of 43% wall ! loss originatin5 on the outside dia=e:er of ! the tube a C5 + 31.6 inches. 116 120 Eddy Current Testing Indication of 42% vall loss originating on the outside diameter of the tube a: CTS-SF + 1.9 inches. 120 58 Eddy Curren: Testing Indica: ion of 44% vall loss origina:ing on the outside dia=eter of the tube at H6 + 11.9 inches.
1 Page 3 of 4 Stea= cenerator =21 Tubes Plugged During the Uni: 2 . March 1987 Outage ROtJ LIjg REASON FOR PLUGGING 122 64 Eddy Curren: 1emeing Indication of 49% wall loss originating on the outside diameter of the tube a: CTS-SF + 3.8 inches. 122 92 Eddy Curren: Tescing Indication of 97% vall-loss ori 5inating on the outside diameter of the' cube a: HTS-SF + 1.8 inches. 126 108 Eddy Curren: Testing Indication of 87% vall loss origina:iag on the outside dia=ecer of l the tube at H9 + 15.8 inches. 127 53 Eddy Curren: Tes:ing Indica: ion of 44% and 60% wall loss origina:in5 on the outside j i dia=eter of the tube a: CTS-ST + 14.1 and CTS SF + 14.4 inches, respectively. 1 129 53 Eddy Curren Testin5 Indica: ion of 45% vall- J loss originating on the outside diameter of l the tube at HTS-SF + 13.8 inches. { 132 110 Eddy Curren: Testing Indication of 44% wall loss originating on the outside diameter of the tube at HTS-SF + 7.4 inches. 133 109 Eddy Curren: Testing Indica:icn of 53% wall los: originatin5 on the ou: side diameter of i
.... the tube at HTS-SF + 6.7 inches.
la 28 Eddy Curren: Testing Indica: ion of 27% vall loss originating on :he outside diameter of the tube a: HTS-SF + 2.4 inches. 37 157 Eddy Curren Testing _ Indication of 34% wall loss originating on the outside dia=e:er of the cube at HTS-SF + 22.4 inches. 38 32 Eddy Curren: Tes:in5 Indication of 39% vall loss originating on the outside dia=eter of the tube a: HTS-SF + 1.0 inches. 40 32 Eddy Curren: Testing Indica: ion of 33% wall loss origina:ing on the outside diameter of
- he tube at HTS-SF + 0.9 inches.
l i l l l Page 4 of 4 i l .- i l Steam Genera:or *21 Tubes Flugged Durin5 the Uni: 2 March 1987 Ou: age l i. ROU L15E REASON FOR PLUCOTNG l l 42 36 Eddy curren: Tes:ing Indication of 32% wall l loss originating on the outside diameter of che tube at HTS-SF + 0.6 inches. 74 46 Eddy Curren: Testing Indication of 34% vall l loss originating on the outside diameter of l the tube a: VC + 0.0 inches. 88 90 Eddy Curren: Testin5 Indication of 36% wall loss originating on the outside diameter of l the tube at HTS-SF + 1.1 inches. ( l Eddy Current Testing Indication of 2S; vall 89 119 loss originating on the ou: side diameter of i the tube at HTS -S F + 0.4 inches. 91 105 Eddy Curren: Testing Indication of 28% wall loss originatin5 on the outside diameter of ! the tube at HTS-SF + 1.1 inches. 113 123 Eddy Current Testing Indica:Lon of 21% and 27% vall loss ori 5ina:ing on the outside diameter of the tube at CTS-SF + 0.9 and CTS SF + 2 ? inches. 120 5 ', Eddy Curren: Tes:ing Indica: ion of 28% wall loss originating on the outside diame:er of the tube at CTS -SF + 0.5 inches . 127 107 Eddy Curren Testing Indication of 27% wall loss origina:ing on the outside diameter of the tube a: VH + 0.0 inches.
i f i e l l i l APPENDIX II - Inspection Results for S/G 22 A. Tube Sheet Maps S/G 22 B. Tubes Plugged S/G 22 i i 4 I
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T G NA 00 00 . _.. __. ._. _. AT - - -_ - LU PO 1 4 - ~ d E gN 3 3 I,, , e f l l l t i B. Tubes Plugged S/G 22 I 1 1 J e Page 1 ef 2 k 1 1 Steam Cenerator =22 Tubes Flugged During the Uni: 2 March 1987 Outage l l ROU LIEE REASON FOR PLUGGING 7 59 Eddy Curren: Testing Indication of 61% eall loss originating on the outside disme:er of j the tube at C1 + 5.0 inches. 18 32 Eddy Curren: Testing Indication of 71% wall i loss originating on the outside dia=ecer of the tube at HTS-SF + 0.7 inches. I 20 146 Eddy Current Testing Indication of 50% wall loss originating on the outside diameter of q the tube at C1 + 12.8 inches. l 31 121 Eddy curren: Testing Indication of 66% wall loss origina:ing on the outside diameter o# the tube a: C2 + 14.1 inches. f I 32 63 Eddy Curren: Testing Indication of 57% wall loss originating on the outside diameter of
- he tube at CTS-SF + 25.4 inches. J l
34 72 Eddy Current Testing Indication of 70% wall I loss originating on the outside diameter of the tube at DC + 0.0 inches. 36 90 - Eddy Curren: Testing Indication of 59% wall loss origina:ing on the outside diameter of the tube at DC + 0.0 inches. 56 90 Eddy Curren: Testing Indication of 47% wall loss originating on the outside diameter of the tube a: C3 + 21.3 inches. 1 1 76 88 Eddy Curren: Testing Indication of A8% wall loss origina:ing on the outside diame:er of the tube at HTS-SF + 1.5 inches. 81 85 Eddy Curren: Tes:ing Indication of 65% wall loss origina:ing on the outside dia=eter of the tube at DH + 0.0 inches. 82 96 Eddy Curren: Testing Indication of 63% wall loss originating on the outside diameter of the tube at HTS-SF + 0.5 inches. l Page 2 of 2 i Steam Generator s22 Tubes Flugged During the Uni: 2 March 1987 Ou: age R0b' LIEI REASON FOR PLUGGING 97 67 Eddy Curren Testing Indicacion of 42% wall loss originating on the outside diameter of the tube a: C9 + 1.2 inches. 106 88 Eddy Current Testing Indication of 47% vall j loss originating on the outside dia=ecer of 1 the tube a: H7 + 22.9 inches. I 117 47 Eddy Current Testing Indication of 464 wall loss originating on the outside diameter of the tube at HTS-SF + 8.7 inches, j 1 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 Tes ing Indication of 26% wall loss originating on the outside diameter of 1 the cube a: VM + 0.0 inches. 11 51 Eddy Current Testing Indication of 38% vall loss origina:ing on the outside diameter of the tube at HTS-SF + 12.0 inches. 37 89 - Eddy Curren: 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% vall loss originating on the outside diameter of the tube at HTS-SF + 0.7 inches. 136 66 Eddy Curren: Testing Indica:ien of 37% vall loss originating on the outside diameter of the tube at C1 + 0.0 inches. i i i l I i i ll I I -/- . . . . . . .+' i . . . i . , . ! i l . LiCLCSUF2 (2) i
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