ML20040H160

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Slide Presentation Entitled, TMI-1 OTSG Status Review
ML20040H160
Person / Time
Site: Crane Constellation icon.png
Issue date: 01/25/1982
From:
GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20040H159 List:
References
NUDOCS 8202170334
Download: ML20040H160 (44)
v • d • e


Text

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TMI-1 OTSG Status Review January 25,1982 0

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t TMI-1 OTSG Status Review I. Background and observations II. Metallurgical and chemistry examination of tube samples Ill. Eddy current indications IV. Operational and safety onsiderations b

V. Tube repairs - rolled plug e

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TMI-1 OTSG Tube Leak Program Eddy current

-100% OTSG inspection (differential probe)

-develop new 4x absolute probe

-qualify eddy current

... redundant inspections

... mockup tesdng

... correlation with Met. exam o

Failure analysis

-Tube sample examinations

-manufacturing history review

-operational history review

-growth rate Analysis

-Normal operation

-accidents / transients e

-licensing considerations

-tube plugging criteria Repair

-Qualify removable plug 1/25/82 1

OTSG Longitudinal Section Elevations [Typ.)

PRIMARY SIDE (INSIDE TUBES)

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C..

Y i

1 l

[

v

OTSG Tube Samples l

l OTSG-A 3 long samples

(~ 70")

15 samples => 39 ECT indications 12 short samples (~12")

OTSG-B 1 tong sample

(~70")

4 samples => 16 ECT indications 3 short samples (~12")

e 1/25/82

TUBE SAMPLE CUT y *'*

.m ROLL iRINSIT55 12 S.AffLE q

1 REMOVED

[

l\\

TUBESHEET

)

8 t

I i

I l

I 1STH TUBE StFPORT l

PLATE I

(

1/25/82

~

i N

l 1

f

'f 8

)

Eddy Current Examination Status Differential Probe OTSG-A OTSG-B Number of tubes examined 15,511 11,955 Number of tubes evaluated 15,508 11,071 Number of leaking tubes 90 44 Number with ECT indications

-1,552

-720 Number with ECT uncertainties in the roll transition

- 3,892

-5,300 Number with no ECT indication 9,974 5,007 Examination scope Complete length 2,027 1,324 Upper tubesheet only 2,024 9th support and up 11,460 10,611 1/25/82

4 P

II 0

400 KHZ FULL GAIN MIX -200 KHZ

=400 KHZ REDUCED GAIN MIX 800 KHZ Differential y,-

u, i i O

I~

s.

400 KHZ 9

O

  • O P

a f

$~

8

  • 8 e
i ;

~

L4-i

~

2,-

400 KHZ FULL GAli 200 KHZ MIX {400 KHZ REDUCED GA b800 KHZ MIX 3x3 1/25/t:

I l

l l

l l

1 l

I l

Projection of Eddy Current Data OTSG-B i

T.40RE M

+ 12 TUBES

/

/

l

. ~

r; ' ~~ n

/

_% <*,4 y, ~:y ^

. '* : If y

IJf a s

it { y_ ~

e s:N

.t,

? .

,(.fb.

/

S

.?-?

~ ShW

[lAyg;

- s, s x

h *t,7 u !)..

i;::[.:

~s

)$

1970BE

.xl4:

Si PERppHEgy N*}' ;;.

&c-ll [~ '

'?;'

j 11.pg BE REGjg Y

l

..--..-.1-..r

1 Projection of Eddy Current Data OTSG-A W

10 TUBE PERIPHERY

? * * *..?

_f)'

if

,lh'l ggo E

b*

{ i'r 3o

~

+

u p:

I/?

j'

^'

. [G ;

Z I

(LANEl--t x- -

c, s

a i

45 45*

~

l

/

10 TUBE PERIPHERY y

"7--'

W

Projection of Eddy Current Data (Roll Transition OTSG-A)

W S. n.

_.: a,arz. g, m q ;Ql,' \\) $

q.

.. ~ 3p, '% ;{.1y pr ' 9 5 v '. g ; L ' M. e..

~

p..

p.

.~s.

4

. u vg. wi Nyat

  • e s:- ;h.

'q\\p ;v' QuG.:3 5.,'. y s

ty:-

, l,

$. ~. d&pY l & &,{? h_ia l

.;s.v l%.e.W O<'

%e % y.; 3: q.a,;.:? n 4

15

. X gt

~.

,.A h.;.:p,lt? :s,v....,

q:

.4q.

7 c

.y

(+,aE; W~. :.

,/ @p.n

,l

..N e;

W

>c s.

i % $['d?p:? - 6,p.:

. + : ; YI% 1:,@:. 4 ?, $

f

-x 6

w z-

'fO p sww:l.? -R<d & v, '.

4 sq D i; g

%.';i g.. ?,

~

7..,.

.., Q414A.

?

>,m... 3

~.

35

. ;u

.p L;

s

..p.

c:' qmqy a,:,

. r#

z:r m.w

..s s.,

q.4, A -

1-OM @y 9

.^

r.

. ;. e5. g u. -.mi., :;g

,i m

c *+

a.

o rw

'stPV, '

r. W

%. t yrsh

.;p;g - 27.5kg,7;GnSh ;f:'sy

.:-eg r

s

/

x.;..w,, >:

?. +%.

'f R 4h0 by fo

'tf-4 '

. A', v'j M 7*-

41 TUBE v,m ) '

PERIPHERY D:!$$MNASI l

Y

DISTRIBUTION OF THE EDDY CURRENT INDICATIONS IN THE UPPER TUBE SHEET A-0TSG ROLL I

TRANS.-

22 -

b 20 -

18 -

16 -

14.-

E 12 -

E 10 -

8-6-

4-2-

I I

I LOWER FACE.

10.

20 30 40 50 60 70 80 SD 100 NO. OF E.C.T. INDICATIONS (PERCENT)

B-0TSG UPPER FACE ROLL-1 TRANS.-

22 -

1 20 -

18 -

16 -

14 -

M 12 -

~

10 -

l 8-6-

~

I 4-2-

1 I

I I

I I

I I

I i

LOVVER FACE 10 20 30 40 50 60 70 80 90 1%

NO. 0F E.C.T. lNDICATIONS (PERCENT) id 6/ L

l i

Eddy Current Signals Roll Transition Mockup Differential Probe i

i Wh 4

v. :

J r-t, e

i Y' ~ '

l '. A - +

No Defect J

. kss - W he Z

y.

'j

.s 4

- ' WE h

e 5 mils wide knotch

.k[

t e 100% thru wall I

gt -

.g-e 180 circumferential l

/

9 l

1 i.

l j

4, i

. i#t s-e 5 mils wide knotch

  • ~

e 40% thru wall e 90 circumferential

3..

/

-.f i.:

e 3/16 inch hole a.

e 40% thru wall l

l

py r

i

rt

.~

  • h I

a 1/25/82 i

-%y-

Eddypurrent Mockup inside Diameter Defect Tube Sheet 197

-q I

r j

~ND j

r i

l

,,2-

3-

~4-

~5 1

~

l N

\\\\

N

\\\\

'h N

\\\\

N

\\\\

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g g

g e

e e

t Y$

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-\\

M,) [,..,,.

n

_\\@i

\\@@

id4 k

- n

- r, n

yg.e

~r Clad 1/25/L2 1.

J l

+

"I o

Eddy Current Mockup inside Diameter Defect 1

2 3

4 5

0@

315 1

1 1

1 1

i 1

1 1

180 EDDY CURRENT MOCKUP DEFECT LOCATION DEFECT TUBE #

LENGTH DEPTH DEFECT (1)

DEFECT (2)

DEFECT (3) 1 NO DEFECTS NO DEFECTS NO DEFECTS 2

5/16 INCH 40%

WITHIN 1/16" 1/2" FROM 1/4" FROM OF ROLL CLAD FACE CLAD FACE TRANSITION 3

5/16 INCH 60%

4 5/16 INCH 80%

5 E/16 INCH 100%

~

~

1/25/82

' x Tube Plugg ug Plan (Phase 1) x

\\

\\

Rolled Plug Welded Plug (UTC)/

Tube Categories _

(UTS/LTS)

Explosive Plug (LTS)

OTSG-A Known leakers 89 1

15 Removed tube samples ECT indications outside 46 14*

UTS crevice > 40%

ECTindications 2 7V 4

within UTS CREVICE Total 139 30 OTSG-B Known leakers 44 4

Remcved tube samples l

ECT indications outside 7

1*

UTS crevice > 40%.

ECT indications 2 7V 7

within UTS crevice Total 58 5

  • Tubes on the outer periphery or lane with indications between 1 S TSP and UTS are to be stabilized 1/2 5 'P"

Tube Sample Criteria Initial Known leaker Roll transition EC signal Multiple EC indications within tubesheet No EC indications below tubesheet Additional Criteria Roll transition - distorted EC signal EC indications below UTS 1/25/82

~

Tube Examinations on Site Fiberoptics Eddy current Visual I

t e

1/25/0:

Tube Examination Laboratory Visual Radiography Eddy current Electron microscopy EDAX Optical microscopy 1

Auger electron spectroscopy Sodium silver azide test ESCA l

Lab corrosion studies l

1/25/82 l

=s-

-w

~

TMI: B 10 - 29 ROLL EXPANSION AREA BEND SAMPLES bp/j

~~

BEND WITH BENDS WITH i

1 OUTSIDE INSIDE SURFACE 2 'M SURFACE IN IN TENSION TENSION

' %d METALLOCAAPtff y

IX lZ SAMPLE SAMPLE

( W-X-Y HALF OF

( w Z-Y HALF OF TUBE)

TUBE)

. UB E_ to -29

/,,

$"v" 1

/

/....

2X 3

TOP

/

W 2

~~I g

Y

INSIDE SUR> ACE OF TUBE 10 29 COMPARED TO AN ARCHIVE INCONEL 600 TUBE SAMPLE 2X TUBE 10 29 ARCHIVE INCONEL 600 TUBE O002*

l l

l l

l l

l l

TUBC C-29 i D 8thD SAW'LE M &l

  • 8J

-m

' M.,m J_NC. H.E,S,,. 2_*

- c

.] ^*# d # ] *6.6. y m

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e.

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.

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,M/,,

I INTEneRANULAR CRACK SURFACE INNUtEDGE AT 1/10' OF 10 29 G

e CR ACK AT 1/10" FRCat TOP OF IO-29

_,/:

l

' 1

~ NI"E.'ci'" 35?#'" -

If* f. 4

?56~y~? 9,y...

a

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1 bh*

$ O

. 43 t'

b 4

  • l' st cARY essTERGRAleuLAR l

lNTERGRANULAR FRACTURE AND MATCHING X. RAY SPECTRA AT 1/10" FROM TOP OF 10 29

s.no e s

I i

1

=

7 5/8" FROM TOP OF Tl?BE 10-29

. h.A > f i ';f.~

g% f5A'}' g

~%

,. _Q, ;i s',,,'.tf

,a

' {'.-

,t.

4 P

.R

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4

.u-

?

l

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  • 3

....i lh3 ICE SURFACE OF TU8E AFTER SLIGHT BENDING TO OPEN CRACK

, INTERGRANULAR FRACTURE AND MATCHING X. RAY $PECTRA AT 7 5/8' FROM TCP OF 10-29 s *.y 4

'?

v4

- A

.a....

N

,.,..a.

woes < $

c-93e 55 tot 9.* W GS l

h I-s

_t T

I^

.- r ca; cam

.Mr.

W w

m

.w l

3

    • .N l

Q 2

.^

}

s l

p. :.

+

r-4

Surface Analysis (Auger)

Tube OD Fractured Surface

/y -,.

e~

e3

/

e2

\\

s'

\\

o a1 s

s i

\\

s TubeID Tube 10-29 Tube 11-23 l

Location Atomic Atomic S

Cl S

Cl 1

S.3 0.6 2

6.6 0.8 l

3 6.7 0.6 4

6.0 1.0 l

1/25/82

l

)

Major-Observations l

>e? Mechanism of attack is intergranular corrosion e Corrosion is ID initiated ce Sulfur and chlorine identified on fracture'd surfaces

^e Corrosion is concentrated in upper tube

' sheet region e : Corrosion not associated with visible

' surface distress 1/25/C ~-

..-----,.,-,a--

- - - - - - - - - - - - - - - - - - - ~ -, - - -- - - - - - - - - - - - - - - - - - - - - - -

Sulfur Corrosion Parameters Reduced sulfur form Acidic solution Low temperature Water Oxygen Stress 1

i 1/25/82 1

1

Possib;e Sulfur Sources Sodium thiosulfate tank Demineralizer resins Sulfuric acid injection l

9 1/25/82 4

Crack Arrest Techniques Dry tubing Oxidize reduced sulfur IHeat-up?

Eliminate oxygen Flush with alkaline solution Eliminate tensile stress 1/25/82

Sa'fety Analysis Overvie w i

e Tube' leak-rupture e Other FSAR analyses e Operational considerations

-e. Localized effects a

4 0

1/25/P; i-

TMI-1 Licensing OTSG Leakage / Rupture Normal operation Primary to secondary leakage 61 GPM (for both OTSGs)

Secondary activity (A 61.0 Cl/CC) 1131 OTSG tube inspection

- Acceptance criteria for plugging

  • 40% nominal tube wall thickness

Tube rupture

  • Double ended rupture of 1 OTSG tube t

e Cooldown at 100 F/HR (RCP running)

  • Totalintegrated dose at exclusion distance 2.13 x 10-3 rem: thyroid 0.155 rem: whole body Other
  • 1 GPM tube leak 1/2s/82 1

i

- - - _. ~. - _ _ -

Licensing Considerations

  • Assure tube leakage <1 GPM for normal operation

- plug

- sleeve

- leakage detection

  • Prevent rupture during transients / accidents e Consideration of crack propogation and accuracy of test / inspection techniques e

1/25/82 J

Basis for Plugging Criteria in Tube Sheet Region

  • Leaking tubes - bubble test
  • Reduced cross sectional area - eddy current

- Minimum area (determined by limiting plant performance stress eventD

-Growth allowance

-Test uncertainties Non-Tube Sheet Region Maintain tech spec criteria 1/25/82

FSAR Analyses

  • Evaluate effect of tube plugging on licensing basis transient and ac'cident afialyses

- RC flow

- SG heat transfer

- Localized effects Determine power level requir'emerits to e

co'm'pensate for tube plusging effects s

i 1/25/82

% Reduction in RC Flowrate vs Number of Tubes Plugged in Each Steam Generator 4

18

]

14 ST sc 8

10 '-

2 t

$r 6

u CC.

l 2'

I I

I I

I I

I O

2000 4000 6000 8000 Number of tubes plugged in OTSG P

I l

1/25/82 m

,m y-m

--w

-,--...---,n---

--m--,

SG Performance i

Non-localized Increase in nucleate boiling length

  • =

-Increased mass in tube bundle

- Increased downcomer level (aspirator ports) 4 Decrease in superheat region

- lower steam temp Localized effects Exit quality -

- Average

- Radial distributiod Aspirator quality

-Circumferential variation SG shell temp Hydraulic stability Emergency feedwater effectiveness Maximum effectiveness on peripheral tubes Extent of tube bundle penetration

- Requires evaluation

- Alliance research 1/25/82

-. ~ - - -. -

- - - - ~ ~ - - - - - - - - - -

e Surface Utilization Vs Flow hx h k\\ A 11 l\\N\\1\\1 1 N

h 3 wmx xx3 '3

\\\\

\\\\

\\

S 40 Film boilinj

.. ::.?:::-

b i

Wh'M:! ~ : ~~ ~V/ Yo%fe'1inr;fij@

0

^

0 20 40 60 80 100 Full Load, %

l 100% Load with ::: 2000 tubes plugged 1/25/82 l

)

i Operational Considerations and - Localized Effects

[1. # tubes plugged \\

!F

2. Distribution F (# of tubes plugged)

(3. Asymmetry

)

Compensation RCC flowrate( 1r)

' Reduce Power (DNBR)

I RC pump flow coastdown rate ( ;L)

' None expected Steam temp ('ir ) and average exit quality (or)

Reduce power (turbine) localized, exit quality (liquid carryover) (pr)

' Reduce power (turbine)

. Reduce power (SB LOCA)

. EFW effectiveness ( 1r) l SG downcomer level ( ;L)

> Reduce power RCS flowimismatch ( JL)

-(loop to loop)

ICS settings Natural circ flow ( 1r)

Natural cire flow ( 1r)

None expected Localized thermal. stress

. in SG 1/?'i/87 l

-

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