ML20151P925

From kanterella
Jump to navigation Jump to search
Steam Generators 11 & 12 Category C-3 Rept
ML20151P925
Person / Time
Site: Calvert Cliffs Constellation icon.png
Issue date: 07/31/1988
From:
BALTIMORE GAS & ELECTRIC CO.
To:
Shared Package
ML20151P924 List:
References
NUDOCS 8808100217
Download: ML20151P925 (31)
v • d • e


Text

_ - _ _ _ _ _ _ _ _ - _ _

i l

  • .I l

l ENCLOSURE (1)

J CALVERT CLIFFS NUCLEAR POWER PLANT UNIT 1 STEAM GENERATORS 11 AND 12 CATEGORY C-3 REPORT JULY, 1988 Prepared By: Baltimore Gas & Electric Company 6

8008100217 880001 P h' f ADOCK 05000317 l P pm

6  ;

i s ,

1 l

l INTRODUCTION The preselected Technical Specification eddy current (ET) testing plan for the April through June 1988 Calvert Cliffs Unit 1 refueling outage called for approximately 9%

of the tubes in each Steam Generator (SG) to be inspected.

The Technical Specification classification rules were applied to the test results of these tubes. The results were determined to be in Category C-3 and the requiremsat to expand the inspection to 100% was carried out for both SG's.

All of the tubes in service in each steam Generator were examined through their entire length. The 100%

inspection ret,uired a total of 16,945 tubes to be examined.

Of the 16,945 tubes examined, 315 tubes had indications of 20% through-wall degradation or greater. A total of 37 tubes had indications which 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 Cenerator 11 and 10 were in Steam 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 tunes had indications which were less than the plugging limit, the tubes were plugged because of the potential for a local active IGA mechanism.

Page 2

EXAMINATION DESCRIPTION The examination of SG's 11 and 12 was performed using the Zetec MIZ-18 digital data acquisition system. The frequencies selected were 400, 200, 100, and 30 KHz -

all of which were run in the differential and absolute modes. The examinatior. was performed using a standard A.560-SF/RM bobbin coil probe. The MIZ-18 digital data acquisition system provides on-line data digitization and storage onto magnetic tape cartridges. The digital signal was also converted to analog where selected frequencies were recorded on strip chart media as an aid to the analyst.

Each tube's ET data was analyzed by two independent teams of qualified and certified personnel and by computer analysis.

Edition 18.6, Rev. 5 analysis software with strip charts was used by each team of analysts. Additionally, all stored digital data was analytically processed by Zetec's Computer Data Screening (CDS) program using HP350 computers. All distorted and pluggable indications were retested. After all data review was completed, the primary and secondary lead analysts compared results with the CDS resulta and a final report was produced. Any final resolution that may have been required was performed by BG&E Level III personnel.

n addition to the standard ET testing, some tubes were i inspected using motorized rotating pancake coil (MRPC) probes.

Selected short radius SG U-bend tubing was inspected utilizing U-bend MRPC probes on both SG's. Of the 315 U-bends inspected i using MRPC, no degradation was detected. Straight tube section l MRPC probes were used in several tubes just below and abcVe the secondary side of each SG hot leg tube sheet. These 58 tubes, located in the sludge pile area, were inspected to further quantify known bobbin coil indications. The straight tube section MRPC analysis confirmed the bobbin coil data.

Profilometry ET was used to evaluate tube denting at the 9th and 10th solid support plates on both SG's. Trend analysis of the pro! ,lometry information showed no denting growth since the November, 1986 outage.

Page 3

6 i l

l l

l l

i EXAMINATION RESULTS j Indications were found in a total of 290 tubes from the 8,463 tubes examined in SG 11 and 286 tubes from the 8,482 tubes i examined in SG 12. Thirty-seven tubes were fou'd to have l indications which exceeded the Technical Specification. nlugging I limit of 40% loss of nominal wall thickness. The cold le3 side l of one tube found to have been misplugged in SG 12 during the l 1986 Outage was correctly plugged (see LER 317/88-03). An l additional 31 tubes were plugged as a preventativc measure. Of j the total 69 tubes plugged ditring this Inservice Inspection, 42 tubes were plugged in SG 11 and 27 tubes were plugged in SG 12.

Table 1 is a summary of the Calvert Cliffs Unit One 1988 Eddy Current examination results.

1 Prior to the outage, an estimate of tube plugging for each SG was made based on ET data trend analysis. An eighteen month degradation rate of 7% nominal wall thickness was used. Usin<,

this degradation rate, it was estimated 76 tubes would exceed the plugging .'.in.it this inspection. However, only 37 tubes actually exceeded the plugging limit, t

Various plots illustrat.ing the loc stions and distribution of tube indications and a listing of tubes plugged this inspection for SG's 11 and 12 are provided in Appendix I and II respectively. The steam generator sketch in Appendix III shows the various tube support locations within the SG's and the nomenclature used throughout this report.

All indications found were on tube outside surfaces. The tubing ET indications can be placed into one of three major location categories:

just below and above the top of the tube sheet at supports, or in free span areas between and not associated with supports.

These inspection results are similar to that reported for Calvert Cliffs Unit 2. There are no apparent differencos between Unit 1 and Unit 2 that indicate a unique problem in any particular SG. This is to be expected since operating and chemistry conditions have remained similar between the two plants.

Indications found just below and above the top of the tube sheet are in regions of higher sludge levels. Most of these indications are on the inlet tub; sheet side and produce relatively low magnitude signals. In late 1986, tube specimens containing these type of indications were removed from SG 11 and have undergone metallurgical and chemical evaluations. Results show that these indications are caused by IGA.

Page 4

l I

l TABLE 1 1

Unit One 1988 Eddy Current Inspection Results i

SG 11 SG 12 l Number of Tubes Inspected 8,463 8,482 Percent of Tubes Inspected 100% 100%

Number of Distorted Indications 15 13 Number of Tubes with Distorted Indications 13 13 Percent of Tubes with Distorted Indications 0.15% 0.15% 1 l

l Number of Indications <20% (Imperfections) 141 160 '

Number of Tubes with <20% Indications 135 152 Percent of Tubes with <20% Indications 1.60% 1.80%

Number of Indications 20-39% (Degraded) 166 147 Number of T :ms with 20-39% Indications 149 136 Percent of .aes with 20-39% Indications 1.75% 1.60%

~~

Number of Indications >39% (Defective) 21 17*

Nember of Tubes with >39% Indications 21 17*

Percent of Tubes with >39% Indications 0.25% 0.20%

Number of Tubes Plugged this Outage 42 27*

Total Tubes Plugged each Steam Generator 98 65*

Note: Tubes, which contained more than one indication in more than one category (<20%, 20-39%, and 40%

and greater), are listed in all appropriate categories.

  • These numbers include R94 L66 found to be defective during the 1986 Outage (see LER 317/88-03).

Page 5 I . , . . _ _ . _ _ _ _ . . - . . _

l l

?? indications seen at support locations appear to be caused by tube wear or steam blanketing corrosion. Wear marks at a support contact region were confirmed on one tube removed from SG 11 in 1983. Note that most indications at supports occur at the vertical middle (VM), diagonal (DH & DC), and vertical hot and cold (VH & VC) leg side supports. Indications seen at the VM support location rows 8 through 11 may be the result of steam blanketing corrosion; the specific mechanism has yet to be positively confirmed due to the inability to remove spccimens rrom this region.

ET indications seen in free span areas are typically low magnitude signals. Three tube specimans containing free span indications were removed from SG 11, one in November 1983 and two i in November 1986. Investigations of the free span indications '

showed these indications are manufacturing imperfections. There l is no correlation of free span indications with respect to I location, elevation, inlet side or outlet side; tube manufacturing imperfections would be expected to produce random )

occurrences like this. j CORRECTIVE MEASURES  !

i Corrective measures have been initiated to minimizo further degradation to the SG's. During the 1986 outage we complated the removal of all major copper components from the feedwater and condensate systems. We are completing installation of a nitrogen blanketing system on all condensate storage tanks to reduce auxiliary feedwater and condensata makeup oxygen. We are using morpholine which will minimize the ingress of solids from the secondary system into the SG's and possible sludge pile cleaning or removal.

Our current chemistry procedures require action to be taken below the Utility /EPRI Steam Generator Reliability Project (SGRP)  ;

PWR Secondary Water Chemistry Guideline Action Levels. This enables us to initiate corrective measures before conditions become degraded in the SG's. During outages steam generators are i kept in wet lay-up with a nitrogen blanket as much as possible. l l

l I

i l

Page 6

I APPENDIX I )

1 Inspection Results for SG 11 j i

l A. Bar Charts & Tubeshrat Maps SG 11 l B. Tubes Plugged SG 11 l

1

l l

l A. Bar Charts & Tubesheet Maps SG 11

1. Bar Charts Hot leg side locations Cold leg side locations
2. Tubesheet Maps All indications, all elevations Indications above hot leg tubesheet Indications above cold leg tubesheet Indications at upper tube supports

CALVERT CLIFFS UNIT 1 Steam Generator : 11 E 4/88 OUTAGE HOT LEG DEFECTS 3 200 150

$i E

F sOO S

H M '

0 H

Z '

I'

< 2 3 50 O \

  • i (M C24 R R A 9

! l HTS-PF

<2> l HTS-SF l

Hi H2 l <2> [<2>

H3 l

H4

<2> l Ht)

<2>

HG l ,b GENERATOR ELEVATIONS 5

8 s

8 <20 >39

! 20-39 y I m CALVERT CLIFFS UNIT 1 Steam Generator . 11 E 4/88 OUTAGE HOT LEG 8END REGION DEFECTS @

8 10 m

e -

g s; l ...

> l E H <

8 H g H a; -

v Z  ! c.

A

g. _

l oL - , --

r--- ' - T- - 4 i

~T~ 2 H7 HB HG H10 OH VH VM y

>H6 >H7 >HO >H9 >H10 >DH >VH GENERATOR ELEVATIONS b 5

3 Q <20 >39

@ 20-39 y

___ __ m

n .:!

l O

CALVERT CLIFFS UNIT'1 Steam Generator : 11 E 4/88 OUTAGE COLD LEG BEND REGION DEFECTS [

10-l I

l e+~ @

$ 'I h .

l S--- -

>- R H

}-- 4 '; e Z l "n b

O ,L _

& 5 O~ -

>VC y- -

>DC

->C10 Q ---

>C9 T

>Ce DC7 i

>CS c'

y VM VC DC Cao C9 Ce C7 GENERATOR ELEVATIONS t 6

0

, Q <20 Q >39 l @ 20-39 h i . - -_ e I

CALVERT CLIFFS UNIT i Stearn Generator : 11 <

4/88 OUTAGE COLD LEG DEFECTS j 20-15:

.6 1 ,

so $

H 1 2

!s J 8& . . .

-_ _J  !

to j s -

! 9 i < E_ E o $___<_J___ $, ___[

l CS C5 C4 1__.

C3 I

CD T <-

C1 I

CTS-BF I_]

CTG-PF GENERATOR ELEVATIONS b 5 '

@ <2o O >39

@ 20-39 y

- - __ m

6 4

I' 7

<-~ $MQd ~~> 1 l

l

?84 888 30?NME2SS

, , ,,,,,,,,, ..,,,,,.. iiiii AYMNrH JOH - .s t O i

- / ~

' TMn._d-_ ; _ ...,

E e

s 7

a j/_I_ ~

r i l 8,

8 g 7__ g. . _ .; _______

_qm._. .og:

W N 9 8 i d

e a a g_ _

, , __ g .str

<w 0 4 s y D

S m fa ' ~__ _._ . _. . _.. J l j - .e,,

D- W

[',

I O { { l o -S 4 8 *. l *1 gg g

  • . ,J--j -GCI C
  • f Q os
  • W >

8

..__4% _-___j_ - -Oct N k E

v a. - . , _. _ .

.ser f l -

._._~ q. _ ~u"F" g ,

u_ . ..__ _

'Z ~ N o gl* l *..__'._' _ .._

r_ _

l l w> ~

p_ __.- .si, H 4 1 y #]_ I'"._a ' >

  • Q, +_h-y p! j_;_7_.___ j y 3 __ _eir

> e I i__, l l *"_r i. i I I, m

J f ,. 1 #> _J .I..f. .._f7 q__,l _ l1, =ii f a y ____

_+.~ l"" ._ ...,

J  ; 5 i  ; ,

i . ,.  !

- s.

J _Ll J}_l LLL. - .__. -

  • ~-# * * '

-J T I I i q  ; 4>  ?.

[ j 9

-=fy'.Yp- ;j '+= ~ w{ . ce

~s 4lgr- 7-f ,',

g -

l m.

o 3  ! 1 l p--4--__2 i aqt t j ,

t_ o Z c:

a S pll 4 _.u L.i*

  • 2-wi (*

._. 1 -

W

' ' {: _!_k.

1 o g g 8p ' ~ -

l" # W 't .. 3 o

8 4 l b, r_! iLm! *J, l._._a .

i J _L ._.~u , t.-J __t_ i H _ l ~ > - '

1

_ ot O y' !i i 1 : s i ! 6 I c 4" i t Z .a  ! l l ._-4 I j i ! l *1 , { # ~l" i . k.

g pg --h --4 ,

y p w-- j -

. G9

( ,:

%_i.__l4_ L .l M_

s -I t >' l bLjJ_l l

i

_. .. ._J__j _.L M, . og i  : j i: -

l- 7 aia y_Q.li r i i l

.._3_.,_ L. 4 . p.~_~gm.e, l .,

4 _ so

u. ( Fal"  : l iti; !i;
_K4_M i r ~t"i, i l]! . r,l i

o i

,- m-

e-
- i-~ i' i l l

3 Ew j  ! e.

l - ei H ._p i l 1"j_1_*l _L -{_p_ L_L.l L l_L!_ "l l

{._.I _ g, o ,

. . . ~ . . .

g- '\,_1_;,__L  ;

_l p LLu I i

_._:.g ..L._I i j i4,_; gi " y,_}_p _

. c, gg..L ~L

! i i

g g .[_ g q _7_. g .q_~~_ Lj j p, i .y ,

e - .

n s ,Q !. . _.% 4__L_1._!_s! , i_e_y: ,

e O

m u.

a o

gg l

g q_Lt_..l_! _

- .*- i I i

_1_ _.L_l'L.2_!_,, ~,1___t ll W i , a um  ;, i 1  ; i i  ; n : , ,

b l

- _ _ . . . _ . _  % ._ gg

$ 85 . _ _4_. 4 _ i '

3 yG h4J ..l,_

l l

__ t_m1.l.

j i . s, t I

l 0 rd M m9 p _'_.E_L . . m . 4l2 I  !

I.#{ al l!

... ~_ _ _ ,,

i a~  %' I i .1 l e aa " Nl. .L;l _". . _ L i -__

Ej..

a iI

}

~

a. w - ~

se hv 1, :90 0961 '91 s w Aspe.arur 0 g is34 gnit hy g1 n te es l

l

<- suou -->

?ERE8SSS8S8EERRSSEai%RRS2SS" T 77 7 7??77 . i iie i i i iiiiii i..i j -tes a AYMNvH 10H -ssi g O

m ._.____

-cas a u,4 -

e O _

-sst g g . . _ ._ . _ . ___.____ _.

.cs:

< 8  : 5 g -

g , _ . .._. -se D U $ $ I o s a N

w W

_ . .___ ._ ____- -cer D-Q *S i 3 s .

g g ._ _- _.

-scs

\

y 5$

ai

, d o __.___

.ect

> en m i- .

I l - __

j -sar w . _ _._i __ ... .__

L--- ___

-oes l2- .. I

<y) _, 4 9'*" .._ . -* -sit

!{1J l l E Y n ame.

_!_._ L J "..- * . ;" _ ..__.S*_ _*

w J i

[I l /

-ort

-ser j ___

O l .0

=

, t.u -g _ . _._ a -oo 1 -- J 1 - z l P

, o _______ _ .

g . ss

<  ! q=

  • l 4 lO 1- g. _S F + l- ~ - , , ,a ,, 3---- - es l

- 58 y e

e e

g o

a,_ e.

. :r_ ___.__ _ . , ,

n

.!< aW  !!__ . - - _ _

! .-__I( -u i

v

' ' " 4=

lZ

O

_I._

M. *.:' _._ .

ot i

  1. Ar t lH 1

!-- -+ 4.- .I j .9

  • I .

- ss j ,, ,

y- q_ 1_. _q ,_ L_ 2 _ , ,

1 i

r. ,.-- .

IO j___. . ___ }._4 " . _

  • _ , _ , _. ~_ _~t _..

. gg jZ l  ;

  • H i

t 1 1

i

  • J,3J,,

j h _1 . _4___ _.~. _-_ .

_.. . pg g i .-  !

ci .

._1  : _.

  • i s, j l l t .

jH u _. . b__ L_ . _ , . _ _ _ . b_._.. ___.__ . . . ___.m___ e,

.O ,, , ., i i e,.

l. J ~ l I

l O- 5 . E ;~4- ~~I ,

~"

)

y u

s.2-Qi 4l-y-,> __ -._y l i _..___p_.

l,

., m e<

) 4 _ _.i__ _ . . ._._. 4 .q

O y

oe

. , _ -- - . ._4. - . gg g l r j)

'U gg e

-8 _. _ . .. _ _ __ _. _ _ ..__

_I.

._4_ ___, _

. ce w

i, W #3_ g a

g- _ _ _ . . ._ __.

_ si i Wm

, f. __ _._..__.__ _ . .. . ___. ._ ,,

} . 0] '8 ts

! 88 u __.____.

s a

E.< 4 i

,, 1 o

) D h Ca. O J9 N a s MV is '40 9961 '93 8WT Acce#41 o*2 'U3A (Mil N180137tG te

e I

<- SMCti -->

798M80282E2E8RRU8EEV?E8N2US" 77 7 7 7? "7 7 i . . i .. .ii,iie i ii >

~

01 - [ N

- Of W ________.w_ _ si O 6 4 - w ~ '#

H N S

~

5

, ~D Di o &i tij Ri Q - 53 CD o ul =

Q D- N w - oc w *E i 8 .

~

) y{

oN 8 _ _._

l - sc

- m . .o l . _ e, H '

W _- _____

- se W

  • I _. e - 0g Q L -4 - GG h - 09 g

O M _ gg g __. _ _ . . _

J s

_. _ _,_ . og C **

8

~ El

~'- f 3 1

0 e - J, . i

, o H

79

'"  ; *I--t

- 08 lW Z i l m

> 5 gw E

h. _ __

I _ _ _

_ se $

O W v$ oi a e a i- I!

O od f - 06 lq C*

' 8 L k v l

  • (f) * (- 4 - E6 2

ioH 1 __

I H

q -t ---+_ ,,

.so O a H ~_ _ - .w ._ 4 _ _ _ _ . .ogg C -

s

- __. - , . -.. .g;g l

l1o

_r -

l .ggg 4._. _ ..___ _ _r ._ . , ,_.. . __ _._

~

jb .4 iO g __ .____ _

0cf D.  :

D l

-scs

, , .=

  • M l l m t-1 g _ . . _._ j _.___- .cyg g H <

C b (D _ _ .gy: I

_.l_.

!W -R s s I hb a,

  • N

- -I -- -

-098 O 6

J U" u y WQ -- -- -

-GGT b^

,, a i i __m.. .___ _ . __.__. _., .o,,

t

~ 4 88 0 o

,j $ es , - ----t -991 o O

QO J9 -lSI en hv 49 :30 pael 'g 1 eurc Aepse ul O ' E ' tf3A iM1) Nyent 3999 se

SG 11 PLOT OF INDICATIONS @ DH, VH. VM, S DC PLANT: CALVERT CLIFFS UNIT i GENERATOR: 11 TOTAL TUBES: 8519 OUTAGE: 04/88 STAYS (0) : 7 L = CO - SPECIAL (0) 1 = 00 - <20 (7) 3 = CD 39 (4) 4 >39 fil * = MULTIPLE INDICATION (0)

TOTAL TUBES ASSIGNED- 12 180 OES

~

~  % -140

-135

-130

--I' I

-125 j 3 y_ _._ - -1zo t- -11s

-. _ . _._ j j

-ggo

-~

- -sos L -100

- 95

' L-_5 -  ! '

- ,o j - 85

- se ?

- 7s

~

- 70

{

e '

- 65 g l

-l 1 - so 1y

) - ss

--} g - so a e a e r - d5

~

1--  : -4
  • l l l l

4 i -=

y  ! -

--}_ ~

- 3a

.J I I I

- 25 5.

b- -m o

- is 4I

,2 s t 2 2 - go I 2  ; 8 l s

2.  !
-5 5 I l'e I w l I I

t . . . . . i i i e i i i e i e i i i .  ; ; ; ; g g ;0 :;: ; g ;S $ ES i 4;

5 . 3 S 2 2 8 R ? U R E U R R R E R S 2 : --

E 270 DEG HOT TEMPLATES "A* <- LINES -> 90 DEG

l l

l I

I l

l B. Tubes Plugged SG 11 1

l

Pago 1 of 5 Steam Generator ill Tubes Plugged During the April 1988 Outage:

EON 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 loss 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-SF+1.03 inches.

50 16 Eddy Current Testing Indication of 47%-

wall loss originating on the outside diameter of the tube at H4+8.67 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 tubs at HTS-SF+0.82 inches.

69 93 Eddy Current Testing Indication of 61% l wall loss originating on the outside l diameter of the tube at HTS-SF+1.10 l inches. l l

70 92 Eddy Current _ Testing Indication of 48%

wall loss originating on the outside diameter of the tube at HTS-SF+0.80 inches. )

I 71 8.3 Eddy Current Testing Indication of 44%

wall loss originating on the outside l diameter of the tube at HTS-SF+0.70 I inches. l l

l l

l l

Paga 2 of 5 Steam Generator #11 Tubes Plugged During the April 1988 Outage:

EQH LINE RFJL90N FOR PLUGGING 73 89 Eddy Current Testing Indication of 47%

wall loss originating on the outside 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 HTS-SF+1.80 inches.

78 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%

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.

Pago 3 of 5 1

Steam Generator #11 Tubes Plugged During the April 1988 Outage:

l ROW LINE REASON FOR P_ LUGGING 138 76 Eddy Current Testing Indication of 48% j wall loss originating on the outside I diameter of the tube at CTS-SF+11.00 inches. l l

31 135 Eddy Current Testing Indication of a j 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.

52 58 Multiple Edd.y Current Testing Indica-tions of 22%, 12% and 16% well 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% l wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+0.70 inches.

1 54 56 Eddy Current Testing Indication of 37%

wall loss with high voltage signal i originating on the outside diameter of I the tube at HTS-SF+0.64 inches. l 54 110 Eddy Current Testing Indic'.clon of 34% )

wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+0.80 inches.

I l

N- -

1 l

1

  • Pago 4 of 5 i Steam Generator ill Tubes Plugged During the April 1988 Outage:

RQLf LINE REASON FOR PLUGGING l 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.

l 57 109 Eddy Current Testing Indication of 17%

l 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.

Pago 5 of 5 Steam Generator #11 Tubes Plugged During the April 1988 Outage:

ROW 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. I 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 loss origi-nating on the outside diameter of the tube at HTS-SF-1.00 inches.

I l

1 l

l l

1 l

l l

l 1

l l

l APPENDIX II Inspection Results for SG 12 A. Bar Charts & Tubesheet Maps SG 12 B. Tubes Plugged SG 12 i

l l

~

1

. H e

i l

I A. Bar Charts & Tubesheet Maps SG 12

1. Bar Charts Hot leg side locations Cold leg side locations
2. Tubesheet Maps All indications, all elevations Indications above hot leg tubesheet Indications above cold leg tubesheet Indications at upper tube supports

,_ _ . . , - ,_ . ,_ ..~ _ . _ . , . _ . . . - - . _ . _ _ _ . - . -

-. .= .. -. _. ~ _ - . . . . . - . .. . . . . _ . . . _ _ _ _ _ - - _ _ _ _

s s.

CALVERT CLIFFS UNIT 1 Steam Ge'nerator : 12 3 4/88 OUTAGE HOT LEG DEFECTS 9 200 1 200 w

150 F

H g F 100 ' , p.

Z c.

< 2 3

0 SO ,

R' N

  1. ~ ~
  • O

< > <> <> <> <> f < > . < > '.

HTS-PF HTS-SF Hi H2 H3 H4 HS MS GENERATOR ELEVATIONS s a

B r

y <20 y >39 20-39 y

_ m CALVERT CLIFFS UNIT i Steam Generator : 12 E 4/88 OUTAGE HOT LEG BEND REGION DEFECTS E di O

8 a0 L

6.

> 1 E '

s 4 4 H g H v 2 E

< s. ,E, i 3 , , .

' ' n O- y y , j y y 7- y p- , , , g,,*

j H7 He l He l H10 l DH VH l VM g

>HS >H7 >HS >H9 >HSO >OH >VH ,

GENERATOR ELEVATIONS s E

h

@ <20 y >39 20-39 g 4

. --er-.r,, ,- . . - . - , , . ~ ,m,-- - , , . - . , ,,#..- ,-~.,..,-,,-,,,4,-e.,.,, , , , , , - . ,v., m., . m., - - - , . . . . . + , ~ . - , . , . . . . + , , , , . .

s O

Z CALVERT CLIFFS UNIT i Steam Generator : 12 '*

j 4/88 OUTAGE COLD LEG BEND REGION DEFECTS [

O 1

g,-...--....-_.---._-_--_---.___.-.---_ . . ~ . - . - _ _ . - . . - - _ - - _ _ - _ - -

O

@ i=

[

l l d F- 4 . .

g

'H s i lo e 4 s a N.- -

E i

i ow k<x'1

__$_. h-M . _ _ __- ____.q

_g___ . - ._, $ _ j! H[

l -

>VC >DC >C10 >CD >CO >C7 >CH iU VM VC DC C10 C9 CS C7 GENERATOR ELEVATIONS t 5

$ <20 C >39

@ 20-39 y

.-. _ __. _ _ _ _ _ _ _ . _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ._ ____d m r

CALVERT CLIFFS UNIT 1 Steam Generator . 12 4 4/88 OUTAGE COLD LEG DEFECTS E 8

l E

i

> N i f- 3

'H Z s l - .' N _ W

, a 2 0 - - - - - - - - - - - - - - - - - - - - - --

--7-'--

> <-> <-> <-> <-> <~> <-> <-> ,4 CS CS C4 C3 C2 C1 CTS-SF CTS-PF GENERATOR ELEVATIONS .t i E l @ <20 @ >39 j!

l 3 2o-39 _ _ _ . . _ . __ . _ __-. _ _ . . _ _ _ . . _ _ _ _ _ _ _ - . _ _ _ _ _ .

Jm

t 9

<~ SMOH -->

%R808U 2S2E8E20RS3 EMU?ERRa0S" 7777 7 i YiT i iii.iiie i i i i i e ...i t ] -tal e Av m yw 108 F, . :

I

, -sst g Q  ;

aw O

me .1, no . JI _'1 .e., 8 LO Ut M l CD M N l

_ m, _Qg) g .._.. .

. ~ -

N g  ! -- -

-CSI w .s o

a.  !
  • e e.

a ~

.svg r-. _ .

u  ; < ~

}- - y ,, H I l _.._, iL.

m ..__..3_. c, D n- a w -

,' I O 4 3

  • I m S., g

- i -

{' g. mi

_l m W I d~,L  :

e 5a .% .

\ W (./1 >- .s.

> j ,,w 8

]

mi N ., ,. _N N ._ _ . . -. .gg3 i ~

w. ._' . __.  %.

_.-. .ogs Z i, sus a . . _._ .

~ *** w- -- . css H I y'

  • H ,N, o H -f L.__** d _ "' . " m ___ .cs:

, ,i -

, t i

___.; 1 ~~ ,,

w _ . _.

_J, g__}.__._ _ ...,

a w e r _1_ ,

, i,l ,#. _s___. g' .

.u,

.J ru,

    • I ~ ~ w' }

, p, f- -+ l, -. T' **

q E

m

^ "

l

(,

)-

b

.:h.L'Ti-_-

. >4

  • i

,q

._.f

_ o,  ;

ofL m  ; "_

a' w*['I_=_

g t._1 ~

_ s. e I >T 2 a- a .

- i ^ ~

  • -d z

{* $ $ ._I _1_.

  • L_ "

. ce i-- a l t~  ;

_. _," 4 _. .} _.__q.__. f_"_'..i. H - i _ s, v

~ x l Y, "

O '

'! _ I

-~ ~

s ma I g m_

{ '

J 4> ~~~ d _ ,m_

.rN_ _ .,

. __ _.
_ L_ _ g u_.4 r b1, ..- a,7,,3 ._.

ai i 2 _ , ,  :

(

J ,. T A *,

< t. ~ f

__F__._aj I q>_

Pem

,t .

3_ _ . . ,

g __._$__ m.7 q ____ _ _

.q . og j i- t l a _, _y 1

i +~ i O _ ml[{ 4J ,

_ .y.p_j i ] l  ; 6 g

_.y._ _ ,,

h;g m

g

[;

L... _7_j___

i

_._ uL.p~

.a ,

j~ ,

@  ! - -~

- CE

'm a b up

- hy -u u ~

(

g y

tt l

_y_. _____ _ . . , y

_j g,;: ~ -- - - - si 9

D $U m m 53 - - c' i

.. ~ 1 m H Q [ W Z O ..,__

.- .g O U

i-' i a a. ~ ~ O.

n se kV 21 *.0! 9961 '91 Surc Jeps.iryl O'3 v3A (wij yygnj Mgg gu

~

SG 12 PLOT OF INDICATIONS ABOVE HOT LEG TUBESHEET. 478'8 OUTAGE l PLANT: CALVERT CLIFFS UNIT 1 GENERATOR: 12 TOTAL TUBES: 8519 OUTAGE: 04/88 STAYS (@): 7 I EPECIAL (0) 1 = 00 - <20 (92) 3 20-39 (68) 4 = 00 - >39 (10) > - MLTIPLE INDICATION (22)

TOTAL TUBES ASSIGNED: 192 180 DEG

.--r=- + .ggo M g -135

-130

-125 1 -120

--A ,

_ggg

~

k' -110

-10s

. - -100 f l l I l 4  :

- os I 1 * *! f e i

l 4 - 85 l

l '

3 h' : - 80 ?

. , i 7J.,1 Sg;yw;g  :

r. -- TO'" -i I. ,  ! ,': ._- ,' = s,s ~,n ss 8

5g.

! _,LJ901- -

1,_.  ; - .0 3 yl, ;;jl n- .

7, r, i.

  • o '-

4 .- _

.0

.- 1 ,> ,;. I s g

i

,j.

a

  • a , . ,rj,j e - 4:
j i;' -1 3- j i, f1*

- 40

- 35 4 ' "

. Jj 8 8 i

__u s: i

- 30

. I i I s.

~1 b l 8

-u e l l I s

-3

-n 8

, , , . 15 4 '

f Iy - - 20 i i i .i , e i E- . . . . .

a s e a;4::; g ;= g E :; :; g g- 8 i i e i . e i ..ii . , .  ;;

5 ,,, e e a a a a a e a e a = e e a o s:

8 270 CEG HOT TEMPLATES *A* <- LINES ~> 90 DEG

SG 12 PLOT OF INDICATIONS ABOVE COLD LEG TUBESHEET, 4758 OLITAGE PLANT: CALVERT CLIFFS UNIT 1 GENERATOR: 12 TOTAL TUBES: 8519 OUTAGE: 04/88 STAYS (0): 7

% = 00 - SPECIAL (0) 1 <20 /6) 3 20-39 (5) 4 = CO - >39 (1) * = VJLTIPLE INDICATION (0)

TOTAL h,9ES ASSIGNE2 12 COLD MANWAY

  1. - + -sto

-135

-~

\ ,  ; f -,15

---+ -

-120

-115 f

j -no l -

-sos l l

-100 f --

~ g5

% - go

--+ '

- as j

l ' I  !

- go ;

i i I  ! l - '

,  ; . - 75 A

l  ! f -

~ 7o N 3 i I 8

i i l

- es l

l l l l 3 .

5 -a4 l l  ;

- ss k~  ! -g l l

. [.

- 45 n 1

- ao

  • I
- 25 i i 1 .

l

! i j 4

!  ! < t

! -m

,ff -

!," f ll:  ;

- 25

- ,o

- g5 e . I  ! I i

~ - so

- -t, i r-

, , i  ! i I i

- s i

t G i  :

j I i I lr r i i ,.r ,, s a

?

s, 5 e a8 6
: e 6 g g ;: ;

.  : e; e; s a s a e e e a e a s a s a a a e e .,

s 90 CES COLD TEMPLATES *B" <- LINES --> 270 DEG 2

_ _ _ _ . _ _ -_ = _

a

<- SMots ->

0E82253 7777 77777 , i 8888EERREEEEI?E8N2SS*

iiiie ie i i i e i i iii

.im m AYMNYN 10H -ssi tu m .

--. .cgg w

in e O l

-GJI a

g a 45 N a 5 i y _} __.

ars 6i Ri W 111 ca o D ,,

en -- -

-Oti na W I

  • 8 I h l =

o ~t ---

~GCI J<> m. o .J h 4 e U Oh O t-" --' *

-CCI bm M b

_.. -gal O

O 4_. . _ _._

-oa

-G18 E

.._._ p . __ _

.or:

D .L_._ ___..__ _..._.

_q_ _.- _sor m .

Z g ..__. _

003 O ~

lH N $ r gH "

p J 1

- ss 4

ly ,,

4 y _. ._ .

_ os A

l H E E9 .

a s

s w

f" vd a

a

- . -= y u

g a. * , - -- -

- 09

,ll- '"

8$ i 1 ,, 1 O , , 1- r- '- ---q--t--- - G4 V L

  • I l

h l_ ' _ . gg o

F g __

_ . -_ .g

(\j .

_h . og l

4 _. .

_q -~ _ __ - . gg  ?

Im .

. __%'_-__ _L _ - og 1 I i 1  ;

7 j ---t  ! ~ - GP ,

m --.

.-_L-.3 --_._ ---

-Q . CV l f< g ___ _ _ , _ __ . . __. 1_. . . _ ,  : l . ss i

1 I i .- l

{ .. _ ,- __ __._

p .4_t_b . og '

' i' i b

]

u CD

. _ _ . .. _ -__ 4_ _ .. _ _ ..,_. _ _ . ._ . _ .

- G2 CD ~ $'

h 8 w

__._. _ ._,,_,_ f . Og b W in I y a 3- -_.__ ._. __ _ s, O yA

'^ _._ .____. __ . .. _ _ _ _ . gg

' 8

. . L'Al 0

$k OO _ . . _ ._ _..-.. __ . g j$ 8 8 m R

Q. O .J T i IJ se wy 0F :08 9961 'C l eurc deps741 0'8 'H3A DellNVQR1 M 95

B. Tubes Plugged SG 12 l

l l

Pcgn 1 of 3 Steam Generator #12 Tubes Plugged During the April 1988 Outt.ge:  ;

EOJ LINE REASON FOR PLUGGING 1 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 inches.

32 40 Eddy Current Testing Indication of 42%

wall loss originating on the outside diameter of the tube at HTS-SF+0.70 inches.

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 originnting on the outside diametet 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 inches.

70 96 Eddy Current Testing Indication of 64%

wall loss originating on the outside diameter of the tube at HTS-SF+0.70 inches.

l 71 97 Eddy Currend Testing Indication of 47%  !

wall loss originating on the cutside diameter ot the tube at HTS-SF+0.50 inches-73 93 Eddy Current Testing Indication of 54%

wall loss originating on the outside diameter of the tube at HTS-SF+0.70 inches. l 4

74 96 Eddy Current Testing Indication of 45%

wall loss originating on the outside diameter of the tube at HTS-SF+0.60 inches.

4

?

Paga 2 of 3 Steam Generator #12 Tubes Plugged During the April 19b8 Outago:

E9Ji LINE REASON FOR PLUGGING f 75 95 Eddy Current Testing Indication of 67%

wall loss originating on the outsidc diameter of the tube at CTS-SF+0.70 inches.

76 92 Eddy Current Testing Indication of 53%

wall loss originating on the outsida i

diameter of the tube at HTS-SF+0.60 l

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% 1 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 originating on the outside diameter of the tube at HTS-SF+0.60 l inches.

78 90 Eddy Current Testing Indication of 47%

wall loss originating on the outside l' diameter of the tube at HTS-SF+1.30 inches.

94 66 Cold leg side plugged. Cold leg tube plug found to have bean installed into l adjacent tube (R93 L67) during the 1986 Refueling Outage on Unit 1. See LER 317/88-03.

10 108 Eddy Current Testing Indication of 38%

vall loso originating on the outside diameter of the tube at HTS-SF+0.80 inches.

56 108 Eddy Current Touting Indication of 31%

wall loss originating on the outside diameter of the tube at HTS-SF+1.40 inches.

l 60 58 Eddy Current Testing Indication of 16%

wall loss with high voltage signal (

originating on the outside diameter of I the tube at HTS-SF+0.60 inches.

l

4 I t

Paga 3 of 3  ;

I

)

4 Steam Generator #12 Tubes Plugged During the April 1938 Outage: j EQH LINE REASON FOR PLUGGING 68 74 Eddy Current Testing ~ndication of 38%

wall loss originating on the outside diameser of the tube at HTS-SFv1.20 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 locs originating on the outside diameter of the tube at HTS-SF+1.10 inches.

74 86 Eddy Current Testing Indication of 38%

wall loss with high voltage signal originating on the outside diameter of the tube at HTS-SF+1.40 inchec.

74 94 Multiple Eddy Current Testing Indica-tions of 23%, 28%, and 13% wall loss with high voltage signal originating on the outside diameter of the tube at t HTS-SF+1.40, +1.10, and +0.50 inches, respectively.

76 90 Eddy Current Testing Indication of 20%

wall loss with high voltage signal originating on the outside- diameter of the tube at 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, i

l 1

5

?

s APPENDIX III

.3 team Generator Support Location and Nomenclature Sketch i

l l

l l

\ ,

f I O * ' ' ' -

-...~......?, -

SIE A M GENERATORS CCNPP I42 I

\ ~I vttfRAL Hof e t0LO LIC

$UPPORil

-vu+

- vM F - vC+ O

\utsaw0st tvet t C( Hil R LiH( 06 51L Ald

    • G(Mt4 A T O R

, _. . . c . . . . - . _ . .

g

'4 l p <,} ) - N +.3)-O) t f

M10 ;z.-n h - CIO -

~ 5,d O $0(10 SUPPt 4 t $

'l2 (5 550)**

  • 1

'"'C '

[

  • VC R f tC at, ( DI AGCM AL ,

I

$U F PC 41 % ( DM,4H,v W,vC,0C ) 2 ARE ALL 4* TitiC K T He

~

c3 I 1%httuolf f2 TUtt( ,

MP * - - ' .. CF

/

25 i _Y 2 ,

i, M6 _.

- - - ~ -- . . a m .c-. C6 h HOI L(0 yp g SuPPC#f5 yg __ CS 39-F gu,PPOets

.cccc.,cusa I.twa0VCM 4 f end !* fiHC R

~

we -__

F 39' C3 u3 f Att ut & 5 u mt ut aa t s ARE C/ t, 10 C/ L 39, Cm Teet SUPPCAtt up - - - .

. _ . . -. C' l , g tumoup

.i ._

L. ei . .

39/

} t i i - TV9tSui.{Secorriary Sr Face)

. .n c

'f ( b -

NN's'.

(

cis er Tubesheet F e 4

s

'3 11l

_j Pows ContaCling Supporis Above 6th TS

,' ROWS MJ Of St/PPORIS SUPPORf DESIGNAllONS -

i9 1 VM e W 35 3 DH.VM.DC 1I 3G 65 HF,DH.VM.DC CF ~ ' ~ ~ " ~ * ~ ~ .~

  • g..--. &

&&f3 7 H6 HF,OH Vu.DC CF,Ca 7+ OS 9 VH, H4. HF, OH, VM. DC, CF. Ca. VC to 115 il 6M. VH, He. Hi, OH, vu, DC, CF, Ca. VC, CS 1* lef, 13 Hio. Hl. VH. He. MF, DH YM, DC, C7, ca. Ya c t. c to

- . n n

Retrieved from "https://kanterella.com/w/index.php?title=ML20151P925&oldid=2965562"