ML20235A015

Metallurgical Rept Insp Browns Ferry Nuclear Power Plant Unit 1 Insp & Evaluation of Turbine Crossaround Piping

ML20235A015
Person / Time
Site:	05000000, Browns Ferry
Issue date:	06/29/1983
From:	Fox J, Woods T TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML082420107	List: ML20234F497 ML20234F508 ML20234F519 ML20234F590 ML20235A015 ML20235A154 ML20235A160 ML20235A171 ML20235A203 ML20235A218 ML20235A310 ML20235A347 ML20235A390
References
NUDOCS 8709230185
Download: ML20235A015 (28)

Text

_ - _. _..

a o

l.

METALLURGIC AL REPORT e

e I)fSPECTION BROWNS FERRY NUCLEAR PLANT UNIT 1 INSPECTION AND EVALUATION-0F TURBINE CROSSAROUND PIPING t

e

(

EAAY hDSAn:veDate 61983 Prepared By Date 4 2f 8.3 Submitted By

.k 8709230185 B70910 PDR ADOCK 05000259 G

PDR

m Introduction Visual inspections and ultrasonic (UT) examinations were performed on the unit 1 crossaround piping during the current unit 1, cycle 5 refueling outage. Inspection of the extraction steam piping and other turbine exhaust lines is now in progress, and the results will be reported separately. During the previous 3 cycles, inspections and examinations of this type have.been performed to determine the amount of degradation l

resulting from steam erosion. This inspection is part of an overall

)

program to monitor the erosion rate of carbon steel piping. Unanticipated throughwall failures map result in forced outages 4o make necessary repair's and may also cause injury to' plant personnel.

Discussion 5

Visual inspections were performed on crossaround pipes 1A1, 1B1, and 1C2.

Each of the pipes inspected had wall loss resulting from steam erosion;_

however, the most significant attack was observed in 1A1. Inspection of 1A1 revealed erosion prevalent throughout.the inside surface of the pipe.

The majority of the erosion sites were active and few areas were passive.

Active sites are where the degradation is continuing to proceed and passive sites are where it is currently arrested. Active and passive sites were observed in the 1C2 piping but not to the degree found in 1 A1. There were numerous erosion sites in the 1B1 pipe; however, the majority of them were passive. Degradation had not progressed to the point in 1C2 and 181 as that found in 1A1.

To supplement the visual inspection program, a UT examination was performed in grid locations on each of the six crossaround pipes to measure and l

[

document wall loss.

The most significant wall degradation was measured in the 1A1 crossaround pipe in the grid 2 location. Wall loss was measured to be as much as 36 percent in some of the individual squares of the grid. These areas were localized and are not indicative of the condition of the remaining piping.

An attempt was made to UT examine the No. 3 grid of 1B1 piping, but the edity of the piping (i.e., laminations, gas porosity, inclusions, etc.)

produced inaccurate data.

The average remaining wall thickness of all the piping locations examined is apptuximately 0.570 inch. The minimum wall thickness detected by UT examination was found to be 0.400 inch. These values exceed the calculated minimum wall thicknesy of 0 382 inch for the unit 1 crossaround piping.

This value also inclu'es the ASME corrosion allowance of 0.080 inch.

If d

the wall thickness falls below 0 302 inch, the piping is not suitable for service without further evaluation.

Calculation of the minimum wall was l

based on the following criteria.

Operating pressure = 198 psia l

Operating Temperature = 3810F Pipe Material Spec - ASTM A155 Grade Kc55 (Provided by EN DES)

Nominal Diameter = 42 inches Nominal Wall Thickness = 0.625 inch TVA Code Class - C i.

l l

1 l

l Evaluation of the data generated from the previous and present UT t! '

examinations demonstrates that localized areas in the 1A1 piping will become unsuitable for service after approximately the next 2 cycles of operation. The data shows that erosion is progressing at a linear rate and is not arresting (see Figure 5). The erosion condition of units 2 and 3 crossaround piping is not as significant as that of unit 1 because they were fabricated from a different material. Units 2 and 3 piping materials contain a residualsamount of alloying elements which provide an adequate film strength to retard the erosion process to some degree; however, the condition of units 2 and 3 extraction steam piping is similar to that of

)

unit 1.

A 100-percent UT examination of the unit'1 crossaround piping may

)

become necessary to identify these localized areas so that they may be repaired.

Attached are the tabulated data, sketches, and photographs of the subject piping.

Conclusion The visual inspections and UT examinations detected wall loss in each of the six crossaround pipes, and the data evaluation shows that the erosion has not arrested. The inspections and examinations also identified potential problem areas primarily in the 1A1 crossround piping. It is recommended that during the next outage all grids on each of the six crossaround pipes be UT examined for wall loss and that the manway coverr be removed from each of the pipes so that a visual inspection may be

{

performed. After completion of the inspections and examination, the NCO I

Metallurgy and Codes Section will evaluate.the results and make further recommendations.

1 l

TRW:FSB Attachments 6/27/83 B2175B.FB l

l I

1

(

. i Evaluation of the data generated from the previous and present UT examinations demonstrates that localized areas in the 1A1 piping will become unsuitable for service after approximately the next 2 cycles of operation. The data shows that erosion is progressing at a linear rate and is not arresting (see Figure 5). The erosion condition of units 2 and 3 crossaround piping is not as significant as that of unit 1 because they were fabricated from a different material. Unita 2 and 3 piping materials contain a residual 1 amount of alloying elements which provide an adequate film strength to retard the erosion process to some degree; however, the condition of units 2 and 3 extraction steam piping is similar to that of unit 1.

A 100-percent UT examination of the unit 1 crossaround piping may become necessary to identify these localized areas so that they may be i

repaired.

Attached are the tabulated data, sketches, and photographs of the subject piping.

Conclusion The visual inspections and UT examinations detected wall loss in each of the six crossaround pipes, and the data evaluation shows that the erosion has not arrested. The inspections and examinations also identified potential problem areas primarily in the 1A1 crossround piping. It is recommended that during the next outage all grids cn each o^ the six crossaround pipes be UT examined for wall loss and that the manway covers be removed from each of the pipes so that a visual inspection may be

(

performed. After completion of the inspections and examination, the NCO Metallurgy and Codes Section will evaluate the results and make further recommendations.

/

TRW:FSB Attachments 6/27/83 B2175B.FB

.Q

. *= i~.

s

- ~

• ??

!3

' 'l; -**, *..

y.

'a Aif4:

.t 33 '$".

N S W M a % "'. G g g

~

'3 G S M Mfj Q q

g,.

Ei#6945.1._3.5'

.t w v

WR M "..

Meng!M)Wasattggggggy 4

p

)

W.,

. e Ja.

Figure 1: Photo' graph showing typical grid pattern on OD surface of piping.

(

../

,r1f-9

?.-..

c s ; )yvl. ; a =;+;_,.

" S.T,7 u

~,,:

' ; 4.

~,

^9 m :,

Y\\

h

^^

=

. [ W,

,... _ s p 2.,

9.y 'i' <

. ~~e.v p-j>

,J;J f*c'-

. r i;;. g w

?

f l

pl 4

[

3

g l[O$l.$y.y.4 f.'

Yhh

<.G f.5..,....! '

j;~f" g~Q Gjf.',

..:f

..y % y }-

.. < g-

~

~

• gr_,, -;=;.

5:~;j,

.p.

Figure 2: Photograph showing primarily active erosion sites in IAl crossaround piping.

(

i

g I

~5~'~

"i j Q w :'.. ;. :. W : '

{. 2

,..,,$). <,Y,, QQ "

','2.y'.,7 'u '..

,?

..x? -1 x,.

f.,'"h.l--l l

.5 h' i,*/ { h

_e..'-

.3 fe.

.,..y

.-r.

, ' 4 2.; 'h.!j i arf'e. 2'ff-'.g,

^

n e*

.d

. >.4:c - ? y... V,+ t,., ~

A u,

s

/.:. y.

1

.g

,.r -

M. &'~,s.

• 2. fl f'

l '

q f' %g.

A,.v.., r _,..., ;,.

s in n.-. y

-.yg.,

, -f x f(9'

. < l,,

,m v y,-

p f.. s. 3:

, 6, ' r oy,,

p

~.

f/. 6isY.,,- g.n't v....,

' I, *^ ye, ',.QJ&. ; : 2..f.? f k.

/

,e t

- go

4. -

.~~'.,c y.~:t', -

n;,*,. 'V..

', f

. '. m.

.. n... &;," - q

+_ g......,

(

[(h.dW' v'[.6.'.[:-

Q*f'# a.Q 'MQf,; "..:? );,' jQ..

/

l

?6.,.

,p

\\

.. ',...: ". g -

o.

t,

c... >,r. /

rqs.

,.,A fe, g

6 Figure 3:

Photograph showing passive erosion sites.

(

l

.:sw%_..p,t.+, tY l -

e

s,:>.

e g'j'* }

-e.

.,I ; ::.'- j: }

~-

. w __

^.'-

(

.w m:. 7 y.._ g: -

a.n8 + :. p y..- a.- 4

- ~.-,,.,, f g

-r

^y,f, p -(

9>;

- g

..j:...-.

- r:). *

...i t,'

.c.

.s

.s-g.-

.;" h ? ' {,

-.. _ _ s's *

f....

..[. -

~

~

W2

-...,..s

!p

,. ~, '.,,..

9.. gQ i

. j..p i v...,...

. ;.m...' _ ;.

e; M '

.~:.

-V 1-

,.w ;... ca :....3

'.;-- WF. -, ^"

7

.e- _, : :

,/~

~.. ;....

..l._

-s-

,o

.z.

13 y y

y <n y_;

i...... y

.*o

,e...

Figure 4: Photograph showing both passive and active erosion sites. Arrow indicates active site.

1 i

s.

e i

l.

-

• I

. - 4 7,'

~

jl r

.. [.'

i

+.

.l 5

i -

3.

• l-I.

!i.

l

-t i

j,.'

6

/

I

.fl' 8

. ' g:

lj

/

~ -

I

.l.

,l!

l l.

l.

l a

. i

. i i

il

!I '

.j i

'I lI i

L

,iI

'I 6

s G

)

o s.

r l

i h

. i :Qvb 'd l

ii i i 4 l

l h

r O

,.i I

I iI g%

.I

/

/l 5

m jj ;

i! !

.!.,M 4-7

.li

i 8

O 3

• ' Dg p

.; j I

I

1 8

il l

d-i

'l f!

' I#' -

5

,iI

~ll

• l.

+ ; ! a

.l

.f l

- g 1

li i lf a

g 8

f u -

i t

i l

• ll l

I el.

A t '

6y. i,j.

,il l.l I

i 8

'g-o e

t wsh s

I il l

r ih

.Il

'i-0 l I'li2

.l i

.I

.{

l

.l

'A I

4 1

/

.1 l !i i

I

.j c

+

s l

u

![y 1

i R

3 4 i;;.

i!

o

,f i

l

.I j

il j.'H.

fg

+

Ay g.!

G N

i j: i1.

I

/

T

i;;

A R

EP D

ND O

e r

.l O N N

IT U

U N N O

O S

OO S C R R

I I

T A

.+4 V

A T T

- CC N R A S

S A A E T S

S R R M X S E S A O T T E O

ET R X X R B R NA C E E U C

l 3

I E

I

4. C KD SA 3

~

IH I

T t

T M T T C

TN I

T I

N N S U # N I

I O N 4

L A t

U L U U A

LR+A@C U

AT T7O WU L

A y,

0 m$ Jf:3g o

2 n

l

56 HEMATIC SHOWING GRID LOCATION ON CROSSAROUND PIPING TURBlNE MOISTURE SEPARATOR IA2 GRID I \\>

O J

1

==

1

(

TURBINE I

MOISTURE SEPARATOR QC2)/

y

)

I

?

m()

j

=Z c

I OF 3

P

'I.

TURBINE MOISTURE SEPARATOR

~~

j j

(

3 2

i i,

0

=

=

6 TURSINE

_(

2 ICI MOISTURE SEPARATOR

~

\\

/

2 0F 3

TURBINE MOISTURE l

SEPARATOR 4-3-

2 l

(

~T::

TUR81N

(

1 IB2 2

MOISTURE I

,f SEPARATOR

/,-

,/

3 OF 3

t l

Qf N

N i

c

.e

~

w m

v o'

Q l

q i

vi N

i I

c d'

Q1

, N9 g

, u c w, eceeem ec-ec em k

I Y

l1 bj\\

l v i i

in

'O l

i H !x.

c i

i q'

w i

e:

c:

i c'i i.

i M

(~-,.Sy!.QgkRvgslS %,3.g 3 S @@9 sa w Mq% 9 -+Q ci ggc h Go+ 9.d o O:% 6 4

w oewa wi -

w <n Q

gs:e3 e d e <eg o 61 a,_Q_Q ss, o ti c i

i ci l

I' q,.t.J e

l i

I w

i i

_d, 4 -.

1 G

(,

('[) I...

i C

t

-Q j

m I

r-i l

i

{ 1 l~

i i

l i

'C di t) %,~Q l

A i

w ic%

l d

5 E

NO N.

b 4ec LL:

E moaceccoce ce eee t c e asss:sm i

o iiii t q~

i e

,i ut i

i

- Q, l

w 2

i o.

i H @I~!'

E i

g i

I l

i o!

e i

l 2

H i

et i

s i

U l:

ol i

o i

6 i

.n i

t i>

QC

• )

i I

i

.1

.9.ss.mussmswLceps.cna qmsAe f

i,

g 8

i i

ci i

f I

l; l

! s:J i

i p

io!gI w'~d #N M MO N9 [N-CDIO D ~Pd M I

l<

._..ca m.- i

.___L.+

m._.

1 i

__,__.2._

l

d e

f,1,

4 A.

G q

G q

t

.g

!.3 i

o w-r gi

~$!'I d

(u- !h "

C H

'd 4

d o

xs-

'u :.'

g g-Q

Q G

j2 w

w w

w di:

D G

.G d

6.

1 T

hhh w h ec%ecec%eet w

e a_e.ssa E

i4 S

4 5

! 18 i..a c

e c.

u t a i a ".

,-yl;j!-@

M.

. @ : Id

. _..a e

c:

e m

g

(;3 ~d h k

6 I5

' O f, ik i._

c:

c ia a

,t w

.HIb$ S$$$$$$$5EN$$5SS$.

i-muse e e ee ec oc cae 6!e.

$a8 O

~$

d

< C i r.

1 c

3-c e

e

c. _.

!@o S 18 id 4

3 i

cc e

w c

c m-a

$ tL' k

! !b k

N

_ a

.c

.c c,

ia c

e e

4 L!J I

Ii a

w e e e e, e c c e e e c c e e e e c.

2 N

!e$

8 8

p H

c a

i e

e 2....

U M

'd 18 9

G 2-4 o

se 3

w.

y-o d

ci jc c

,o b

l

%l lh h

b l

cc e

i e

o c

s t e, hh hh hbbbhhkk khkb h

<C e* eess_ce he,e.ss,emme e i

i I

~b

$Y NC b

..__i._.__._._,

E_____.____.________J-______._________

'E

.i. C i G psi D 2.

M.Ih/.I M U R O. I, %I/1LL THEK MEAS. CDA Ai3 C

._D

' E I F

_E_ H I iJ l_h_,

~

l l

0490 0,l@!

0.SYC l I

1 2.

I A6/C lol26 I

Id./dc t

.i

! 3-A6 /')

IA420 lo4fC' n,b&n,ucT.@ 6.59c 'O.6@'n/,20(%10 BA3!0. lac 0210i Ablo

.+

O I 5 lOSD i.

CLIO f6,610f 6

10, 5 0 l-n4?B o,6@l

_'T

n,bCo.

In b20

'O.610 '

i R fnMn 6360,00,616'O,(20'0.6l06.W6 0,lda0, fob'O.WO!01M-9l M.da Io.59 A62oi l i,@

iO I lt0

.A4/CI

/

A II

/i,(2 n(20 AW i

I2.\\04VY6.id&'Oi6100A2C ok26 C.blo G.llu a420:Atm 6.lasakl0

)31 i

!Q43T

!a/2) io,6/0

.(.

14 i

~C42D A6/o

o4/o 4

\\5 i n,W infd6

\\0,(so

\\

l b (6420iOMo fu% 0klo o, cola 6%C4?D 06206,420 0,620042u t7-I n,(a id4/o h4/b

I8i

\\

folcCO hmo

\\nAl6 i 19 1 i

16,5T HAdd lo,/to I

i 2n '04Inodi'O'n5200, uc 6,5000516 Or/LD 'albAAl6)6.ht}n,5iQ 2Ii t

D.5SO

'n,510 I ffCL,_

O I

!22i i

id./d4 i So ld,5foi d

!23i

!o,/J.

!aAL Id5Si l

24 d&l[.LQA?O04310,620 0410hhTo (),&(6'0,6l0'n.b106' 4lCl0,(l&

f 5I i

04b

'6hlO l Gioc, _

? li1 O.GQ 0;WO Olot i

O

t j

gan 18i.

6 R I D 2_

I 3

.I RIMIMd M U,T. WA L_. THicr, MEAE(Id.)

G H - i I " J ' '<

J A l E I C l D.I E F

l I-IcWo d5r ;

b,56

~

'2 i

fnsu I

dSLO; fCAE10 34 l-

' s'56l 1

oA60 h450 o

0 520 Ig,g 41 I o,4g!,

5 '09co 0.4ToI6.4566.LQo.4% lA9R) b.42D o.180' 500 'o,986.% <

l 0

0

!a45D!

l 05.'.O CAfC r

7; h.450' i

n5D AA50 h

8I nA[c hAGO 164R6 n

9 h& 0.@M4f0jo.9M)gdj0g) 0.19 dA@!d4f6o#'df0 lc I

0,2c !_

1d50 Id4fc-j I( l 645G C.640 UAEC I 2. ;

'6AR2

'o,9@

64D I5 M% MR?n4W6%:D.4 Pol 6M CAfC0,90'.20 C.WC.49:

a l

I4 ^

'a4?o' fFA56 i

UAC

(

1 i I5 6920' h4Z

!6Sco j

j 16 -

0.4fc.

E).O b5to j

f 7 nSC6 0.9bAWnWB 'n.4RC'O.% 0.WA416 l645D OSI) 69fa tR :

n#c h,go

~

lo.15D l

l9 i A@ -._... !

$5th 5450

)

20!

164 %

i 6~,fdo ASEC 2 I 6450h5D6TW 65r'05%65fc 696 6.9% 0.(db 6,9D C.SfC 1

22!

'oSc Md I

nuo l 231

'd,52D' h@

l

!C.ED I24:

0.5%

h5fo faf:>c0 L

l 2.5'i l

i 2.6 i 1

i_ _ _ _..

O b

I-l

i l

1 A1 G R I D 1.

AtiWIM UM U.T W'A LL THig.K. MEAS. (Id.3 e

1.

2, 3

+

5 !6 7

9 :9 10 1112 i

h 05tl,a%lospas32p.5480.su ageo,5;g os.g a5 o c5,o g

k b$?0'Dkla Ooh $$

0klcl05W $k07 D$ bb$b 05 D5S 0*

• he 0

h h $' h,

{

s 1

D a41005Mo,@'O.%A410ose 096%a440 6% 6%a4Et E 65m09l6LK0c.sn64%6964tr6,+7acSmlcSoG%6AS f

F at 0A$d642alG9'o.4%

02004Y>

6520500G0 04 h

a o

e f

H 6%l l64.

64b,otio Chlo a%a520 6.+70 6%s~

I d47das ase!

0@

dSd4ft6fV C40 4

a 1

l

/

.i. A L G R I D

?-.

j min'IMUM U. T.

W'A L L THIC K. Mf3 AS. (.IM.)

11 2

5 4 5:

6 7 l 8 5 jC 111 1

<k G69 0.E 0.6501069 0.62 0.69 0.62 c 60 0.00.04.fC C/c0 l

i d6dO dN'ONOh bh a$$ o.h60QAbd'd M dN O[$O C.0540 dAEc a5&oko 634 660 asr.o o.9 o,2 669 Gflo oawauseas ce as asanas c.u os I

astc.a gg a% a% c55C biE005C065& 6/2b o.% O5to

~

t 4

I i

C

! F asmosas asc!aiepmc5e49420268 G,oAus'Da@L16%!OBIa%6@ds6a5x6+200 H

aswcso:6stoonca a sc a e o s a s a+10 T ONC 0.51166% Qlc5d Qe,G6%,DB O,470 i OWQ5a3 CSC e

i

(

~

~

~

~

(

~

j t

Q

~

a o-o' r

(9

~

9

~

I.

- 7

~

~

o'

. D' v

)

ggaacze xfg 0 O" 9

$,S zp@@D2 9@

a

/g cipD0ov909,9,.

i 2 2 2 py99rpy7 9 9

yy c 9 9' O' D 9' 0v c

0 g.

v r

W 1

~

s Y

9 9

~

V 7c' i

~

i w

O

~~

m

~'

T 9

~ w U _.

1 r

0

~~

7 0

g

^

v 0

'9 a

1

/

2 i

9 9

z 9

i H

l 9

9

~

9 7UW 7,m.9y7fS U

Do

c gwammg797,,

9 2xs L

T 2

gc

/z l

,y ] 1 -

7 7

9 T

g0DVVg.pW,oyi!V9.oogpV

9y i

7 0

)W a-c7 o

1 y

V 0

v o-9_

f

~

l E M

.J 1

%g -

c-i

~

~

i 7

9 0

0 o

1 0

B 2

~

i EnO.

- 0 9

9

~

9 T

1

~

~

9c0p}

(,y p

1 o1 p

0 ngEiw G

y 9 c

VyL g

9j027 9

v gn 1

29. Y9r Ta,j 9999:o

V,g v',.

7 y 0p0

,p O',,,

.p o_

o qc ir g

W 9 n

d u

o I.

o-

& ~-

9 S

/

t i

f 1

- o

~

9 c

I W

n<

jr j;i e-o d

a y

ho mvenn2;pp9qa, oy6o9Os56 p 9g. g31a g

7 9, 9 c

s 9

g.

o g 0 v 0 9 q, r )W y m v Fp<[T]Qq.

O',o. 9y j

m ~~~

w 2-y 9

O rl

~

M e

ji i

0 Q

9 i

~

0 9

q i

ps

~

g3 1-9 rTy y y ogUgg 1 g y,.

i

- l-

~

~

r l1

s y..

El H MALL THINNING INSPECTION DATA PLANT:

MM~^/

UNIT:

/

INSP. DATE:

3 5

ba e f' b+b SYSTEM:

/

/

MTL. CLASS./ REFERENCE THICENESS:

t LOCATIONS INSPECTED:

PURPOSE OF INSPECTION:

FOR WALL THINNING 7 INSPECTION,pETAILS:

V m<a ~

Mok i h - d' W

/ E -l/J de,1--2.

%r

/AJ

'u r i /. 2 V

t

, t, t '

METHOD:

INSTRUMENTS:

GRIDS:

en

/

- e - m e /_

INSPECTIONRASULTS:

.n

~

c~,x+

auf n -r, ~ x CORRECTIVE ACTI,0NS:

REPAIR / REPLACEMENT 7 MATERIALS CHANGES 7 FAILORE ANALYSIS 7 DOCUMENTATION:

Mo w >o I WAMr-

/m wi/

A e,,

_T_ r_r dm~

idn'b l <

AfshaJ, A- < : <. ' -

G t

a i

1

r.

(

.?

FJfl WALL THINNING INSPECTION DATA PLANT:

8FM UNIT:

2 INSP. DATE:.-

77 SYSTEM:

boM A'd~1m ii

/

T NTL. CLASS./ REFERENCE THICENESS:

2 l

LOCATIONS ~ INSPECTED:

l PURPOSE OF INSPECTION:

6Ad.

FOR WALL THINNING 7 62 o f

INSPECTION DETAILS:

METHOD:

//Tf INSTRUMENTS:

GRIDS:

A/ # a d #

INSPECTION RESULTS:

Afd-L,

./v

/ b m N) d L

i CORRECTIVE ACTIONS:

A/ m REPAIR / REPLACEMENT 7 MATERIALS CHANGES?

FAILURE ANALYSIS 7 DOCUMENTATION Ali,o fn

/ 41

/?~. J E A1&n? I /:

d.,. :/ 2 o i ? 7.f,

/4 d,2 97 e 41.1 Mi)

/

I

/

1

}

j t

f j

I t,

som e.-

. m 'm 0 421 3 5 3

= = = = = = = = =

Messeranduns

======== nuar mruoserr 780425R010t...

==. w., s. no,d, -> mes.ner, amie

\\

tR ates summai - nem==== ruar - Taxe mens:- mum anaxs uma naurum 1 visited the 3 dest sa museh 27-M esth a weaking gueur esspeeed of I

J. Esmeesd (M), S. EBase.(pdF) and spenLf to sampest the ts. 2 kommer esada 11ame and 4=maped=9 W 1asetten for additianal piedme seassmemes. Addsadamm1 seassadass ase seguesed per M L2004 ta esder to lhda.edW assummaa. A elene a===d=M4= ed unit 2 pdedes sesselsd asseset heehan hangere and essesat hengere utdeh seeemely had been sepedsed. These umse also essesal sprias hamgese think had been esmpleme&y beessmed est.

1he fellaudag failmees mese meted er had bem aseed la the past by site

's 1.

Bad dealaras et the tes=ad=4 ende.

2.. *m- -t a '. ant 1= e se eye ved estenhed pedass due te teameed h

essee eastama ed the bets fsee frettias.

3.

Suppset tseekst anehas bolte.

4.

Spring peensed is est of adjessamme.

Immes v t==* tag off.

e S.

These faileses wese esmead WF 1mpost lands :===8*4=1 frus high suplitude tremesmas response utdeh esmesses the tresol laadte of the serias hengers.

The freestag of the eye' red and thsougb-bolt 4=d4===a a steady-etaes v h==*4-sedah Lande to failmse by toast see te redmond - - - -d==.

e The high==91t*=d= * - ada=* reopease eseld be readily==ad*=d br esemel eyosan operettas due to the high #1mr4h41try ed the suppset arrangsmaat and the disestaan thenges of this pipaas.

After w =dag the pipes, it une - 1= dad that the best say to limit the pipe movensat to *~=reakle lasels is to add rigid seetraints is seek pietas rue seat that tharmat growth is est restriated, but tr==at==*

response is reemsed. Ruisting hangere in this eyeten ehmaid aime he reserhed to replane sesasety worn parta and to adjust puolmed as the springs.

Taah4== devises should be used om muta embjected te viheatlans, esse empport breekst mesher heits (redheads) ukish fail ehem1A be replaced vitu een e hales.

s Asp UJ. Sessepr Asade Asg4sedy as see PeyreB Jasener Men

r g a-e-a,, f,,,,,,,,, t,,,g, g,,g,,,,,,,, p, g,,4,O w, p,u

e. - i i

1

% anedanessas mansk F13ae-a la u m uses nur mama near - mir==r mean man um muaries

s. user mal emelpen the thesent essenssas ed the eyeses wie essse sesammemme es the laeossens enlassed by this sostdes sseeps and 12 pdpe essamese ese sambas enemahle venees, these seassesses assa he added.

is the seemsmos.ame emnessese, a eenhennessa es tem seassednes and emmehees any be segesend. ma speaan teamstasse tede psysse sa subjaanad as ese est halsamed to esasenkese to the hameer fassmeen, and she additsan se she wisse sessnesses ekseld admemmesty asesense ear esemedant. ~.

mile at the esse, I alas lashed snee the fausosas esees ed smearest to the Best eyeaa asemp.

1.

testems essessmene ptodas - see ed the ads suas et ante 2 pipias sess asumed ser my sempestame. m e pdysms shound signs W W emme essessemmlesesses themessee eseh une found on.ums: 1.

assover, the espak d r-======*=5to 30 atla, unit 2 une e@, masses the depet une est semely as seenes.

s for adla sheersed es um641 use 2 Se dif9esesse is assaumsgy for emit 2 pdedag (..

My et ames.

1 possent seest es. Or, SL) versue inds 1 (6.4 to S.4 pesenet Os) espesomely is the senema fee the diffesense is the eheersed sees ed j

user.

mese amo sammehmt tases esseine ed the ammesy essere and the==mmmmy ansk thee see ehesuvud ta the sumatador ei taan papias. This esold possibly be meessemed. fee by a diffeemat==**1h=== ta the sammere than me. alhaen of undt 2 shseed esas slight is the mata some ed ydpe.

etene ed eseadas, sheemas the alhase of amit 1 mee ansames deceid of I

thaa eersestan/consten phemmesmo.

De En. ene==*===*4=a la taham off een ed the liase uddah uma emastand I aseed that the _ ' 'esentes y==+=== une stathle se the as mate 2.

taasde of this paetas alas.. H e depth, egata, une saly a few a G a et I alas assed that the aussentanteseenas postase enamed.- ^ --t y aset.

12 to 14 feet up them pipe, and the sende ehemend fees a sust-ved eelse Pimeures et stda papies esa smailable et my desk.

'te a light grey.

Immamel Steam jet air ejeeters. Rjessere are operettag==*4m#a==m-11y.

2.

1re esmezel volve eburiat leadere should be immea11=d en the emit 1 pseer:

this estage, per Em L2 TBS.

Nac vihreri-Despite the feet thec emesmatwo undif4==e4== were made to the unit 1 EBc syssess during the puweteus emange, the v4h==ria=

3.

I alas asted that 1 seal did met appear to be mottaeshly dias =4M-unit 3 eens listad as Euc vibracians 14=de=d even though the 1 ment et vibr=*4==a observed me unit 3 usee siemifiaantly 1==== then en unit 1 et the emme time. Both units usee eerrytas m

'y the eene i

O***A n

s

• me e

g l

l

=

l 3

j

---i m nos.sh ruse m ae We seems rear sczma ruar - mr aurser - sama mm uns madrzcz 1aed of 1M4 magamotte.. Sea I shnehas into thda attenties Bar Emnhopillar ladesmed me that the teases the mest 3 vihe=m4=== wese laser see that the emit land had beau dessessed isum the posse-that-the viksettoms Be meted that a dessense of'ee listaa es 5 segamette tese uset sesses.

la land esm&d haue a =8g=*e4==== efines sa thrvthenedens level of Da fasthme dimemessees with as temmedsen and Sun Bertas, the M piedes.

ther iemaaad that ther t=4 noser utsmessetthe unia 3 piping vihrettas at a pedes in taas utsus&n. the se6s see "MC' vthmettens 18=d*=d."

4.

Ommeremoose I and F - Cuungressor I hee bene spensting setteimaterily, and esupseener r le tenden need beesume esagemener E is soldam landed to as==ame then, 30 yesones espesity. Thesefeso, F is set etasted.

S.

sheet sysla resirs ematset.volvee = these valseo ese esill giving pseblens (sedesamee L 4. Emon11's asse to um filme ed April 29, 1976, and Em M714) wLak banham hangers and amakses. EDS will taseostante the pesethL11ty ed ima=*atting "- '

-ut " valves to reduce eartensian omd thasedese vih==*4 - and andee. It une meted by s. Meer and J. eta = add that the smukhene utdah had heem fiald testalled suse p1ased at lan2feative 1==*4

. as stil smittate as ECB ta peepenly 1 asses ses emubbene and modify the mesher piste (where the pipe goes thseech the well) to esetsen v h==*4a== until e more e

y=======* fim een be *- '

\\ v. ~

M IJ8BsT5 C. A. Cheadley, W13325 M gas ces, D. L patteresa, W10C126 0 E 0

Der T5-=

1ces Rey L Dunham. W11A9 C-E E L tivens, 5100 MID-E L G. Damer Vf]S24 C-E APR 3 0 W5 RWsTh eas L S. pos. 716 354 (2) dmos, sagn c-c

Q Alff 7/C Y2 / 353 d 4 2.1.

/pf fuf.

PIPE HALL THINNING INSPECTION DATA OIAI UNIT:

A INSP. DATE:

A79 /K / r, /7 7 7 PLANT:

SYSTEM:

becd edam

/

/

MTL. CLASS./ REFERENCE THICKNESS: ATT47 A/55 LOCATIONS INSPECTED: / M h e O M % f e s / L ',4 e~ t.m.

tw, ea,w,,J,.

2 J A h Adn

.c,. L..

d ii g

PURPOSE OF INSPECTION:

8^ * '~

-c 1

i FOR WALL THINNING?

INSPECTION DETAILS:

C r e> =/~

METHOD:

UT INSTRUMENTS:

GRIDS:

INSPECTION RESULTS:

C Aw#

I CORRECTIVE ACTIONS:

REPAIR / REPLACEMENT?

MATERIALS CHANGES 7 i

FAILURNANALYSIS?

I DOCUMENTATION: /lle r,n 1k MIEd Fi Ac~

La de,) A 2 L U$

daMTJ Arn.. 17 2 1979 GArds 2 '7 c.rzy !? 91 )

i 1

1

' f UNITED STATES GOVERNMENT gg

}g Memorandum EMESSEE VALLEY AUTHORITY [

Mechanical Engineering Branch Files f, To A. W. Boyd, Senior Mechanical Engineer, W10A25 C-K rnou (R. L. Lahti. Metallurgical Engineer, W100186 C-K MAY 2 21979 a m Ectr BROWNS FERRY NUCLEAR PLANT - TRIP REPORT - UNIT 2 CROSSUNDER PIPING

, INSPECTION - N1M-1.4.1 On May 14-15,1979, we visited the plant accompanied by D. L. Goetcheus (PPROD). The primary purpose of the visit was to inspect the unit 2 B-1 crossunder piping during this second refueling outage for signs of corrosion-erosion.

As noted in L. W. Boyd's notes to MEB files dated April 20, 1978 (MEB780421353), there were almost no signs of attack. in the unit 2 piping when it was examined during the first refueling outage. This was the case this time also. There were some signs of attack on the HP turbine exhaust end inside the manway cover, on some of the circumferential welds, and in the first two feet of the No.1 extraction piping.

By far the greatest depth of penetrations was in the carbon steel material. Some areas of the No.1 extraction appeared to have approximately 30-40 mils penetration while 'cartain areas in the manway cover were slightly deeper.

D. Goetcheus proposed to havean ultrasonic inspection perfomed on the

('

first two feet of the No.1 extraction and a grid will be marked (3-inch squares similar to unit 1) for reference purposes during future outages.

There were very few active areas even in the No. 1 extraction and manway cover. Most of the areas had the bluish oxide 'which GE claims is indicative of."passivated" areas. 'We had planned to boroscopically examine some of the drain lines, but the boroscope Was in use on the refueling floor.

D. Goetcheus will return to the plant later during this outage to use the boroscope, and he will forward prints of his photographs to L. Boyd. From the portions of the drain lines which were visible to the unaided eye, it did not appear that there is'any significant attack of the drain lines at this time.

Access was gained to the 2B1 moistare separator b'y crawling past the

' turning vanes and up the pipe. Attack of the vessel and internals was random, and only localized " active" areas were observed. The worst

. areas of attack appeared to be on the support struts for the vessel internals and ladder rings to a height not exceeding six feet from the vessel base.

In summary,'the addition of the approximately 0.5 percent C_R.Ni to the crossunder piping on. units 2 and 3.would appear to be-very effective in eliminating the corrosion-erosion attack as evidenced by much fewer areas of attack and very little powdery oxide on the pipe id.

SENT W2 5Jgyg r

\\

i Buy U.S. Savings Bonds Regularly on the Payroll Savings Plan

~

W t-

' Mechanical Engineering Branch Files I

MAY 2 21979 BROWNS FERRY NUCLEAR PLANT - TRIP REPORT - UNIT 2 CROSSUNDER PIPING

!lNSPECTION - N1M-1.4.1 In addition to examining the crossunder piping, we also examined the cracked shaft which was removed from 3C reactor feed pump on approximately May 9, 1979. The crack appeared at the surface in the form of an

" eye" (i.e., two-branches linked end to end) with one branch extending

.for a slight distance into one of the keyways.

It was located approximately 43 inches from one end of the shaft and 46 inches from the other end.

Tink Haney infonned us that preliminary ultragonic examinations indicated that the crack extended for approximately 180 around the shaft below the surface. Further UT examination will be perfonned prior to opening the crack for analysis.

I noted that one side of the double suction impeller had severe cavitation damage to the leading edges of the vanes, primarily near the eye of the impeller (the other had almost no signs of damage other than slight surfaceroughening).

In two areas the cavitation had progressed completely through to the bore of the impeller. One of these areas was immediately above the keyway where the crack appeared and the cavitation had penetrated the key for a depth of approximately 1/8 inch.

In addition to the cavitation-damage, the key showed signs of fretting where'it had moved relative to the keyway.1 It is felt that the fretting action in.the keyway caused fatigue cra,cks which prcpagated until the shaft weakened sufficiently

(

i to cause the-shaft' to vibrate. Catastrophic failure was averted by removing this shaft from service at this time.

Mechanical maintenance personnel-noted that the im)eller had been mounted approximately 0.180 inch closer to one end of tie shaft than to the other.

Instruction book requirements state that this difference should not be gr, eater than 0.11 inch.

It should be noted that (a) the side of the impeller which experienced the cavitation damage was on the " tight" side of the impeller; (b) this side was also on the side of the pump which would see the lowest velocity head after the suction piping elbows down toward the pump; (c) the.other side of the double suction impeller had no appreciable cavitation damaget and (d) the crack in the shaft appeared just below the keyway. Therefore, it would appear that this failure was precipitated by hydraulically unstable i

flow to one side of this' impeller.

In order to assist in detectino this problem if it is occurrino inothers of these pumps. L. Boyd agreed to contact the P PROD plant engineering branch and discuss possible alternatives such as providing access holes for boroscopic examination or acoustic detection ecu1pment.

It should be noted that this-is the first of these pumps so De openec. on any of the three units.

Also while at the plant we examined the cracked s'hort-cycle recirculation line on unit 3.

George Jones (Outage Director) informed us that unit 2 piping was found to be cracked during this outage and plant records indicate that unit 1 piping had a similar crack over a year ago.

The cracks on all three units were in the area where the mounting bosses for the hydraulic snubber

(

are welded to the elbow downstream of the short-cycle valve.

Information on the location and orientation of the cracks vill be fomarded to CEB for analysis, 461151/461152/5

3 i

Mechanical Engineering Branch Files l

MAY 2 21979

~

BROWNS FERRY NUCLEAR PLANT - TRIP REPORT - UNIT 2 CROSSUNDER PIPING INSPECTION - N1M-1.4.1 but at this time it would appear that the cracks were induced due to fatigue from vibrations induced by the short-cycle valves.

Installation of the new short-cycle valves with " equal velocity" trim should alleviate this problem.

Of the three cracks, only the one on unit 3 was through the wall and it was reportedly leaking approximately one gallon per minute before the drain line was opened up to depressurize the line.

l l

h LgW. Bog Yois W AL

/R.L.Lahti LWB/RLL:CG cc:

C. A. Chandley, W100225 C-K G. F. Dilworth, W100224 C-K D. R. Patterson, W10C126 C-K DRP:CG -

MAY 2 21979 cc:

D. B. Bowen, 5200 MIB-K R. G. Domer, W9D224 C-K Roy H.~Dunham, W11A9 C-K I

MEDS, E4B37 C-K 1

S i

l

\\

461153/5 L_-_-___-_______

l

'o

.o

/

I 3..

FIf.1 HJLil THINNING INSPECTION DATA A

INSP. DATE:

I/88 i

8k UNIT:

PLANT:

bme I

• le

{

SYSTEM:

'/

/

MTL. CLASS./ REFERENCE THICKNESS:

1 LOCATIONS INSPECTED:

PURPOSE OF INSPECTION:

FOR WALL THINNING 7 b 4I shur INSPECTION DETAILS:

0 METHOD:

INSTRUMENTS:

GRIDS:

[

M

• JN A

N INSPECTION RESULTS:

!a./1

-daf. :-. '.

e ( w

/ f.

j 1

u C,..:.

G

/ m')

9 JL L -

k s

-L-W

)

.h, 1 M) 4-c wn MA f 0. 5 %

c e+ N: '

t

/

I CORRECTIVE ACTIONS:

l l

REPAIR / REPLACEMENT 7 MATERIALS CHANGES 7 1

FAILURE ANALYSIS 7 M

Mua ~U'I mmf DOCUMENTATION:

/

1

__am___._._...._

i i

Flft MA,ldt. THINNING INSPECTION DATA l

PLANT:

[M UNIT:

T INSP. DATE:

87 %

/9N SYSTEM: b m !- ~ d N J ?,

& W ae W A S,-

./ t'ae w Ka. L.,

g MTL. CLASS./ REFERENCE THICKNESS:

b auf

/

LOCATIONS INSPECTED: /A/ a / /0/ e, m u ~ s d l.,

. Szho m de, arfre M

~_res

/ u t t-L r&L '

G t i j

PURPOSE.OF INSPECTION:

/%_d A

1. m'

- e#u w k o

FOR WALL THINNING 7 INSPECTION DETAILS:

l METHOD:

\\/u l'

s_ A 07

~

1 INSTRUMENTS:

GRIDS:

fee m #

i INSPECTION RESULTS:

Cr M

e. N y

1 I

CORRECTIVE ACTIONS:

A/Nfm Zeh s l, -, _ f /_c/dm'.o e.,6 cr

/

O

/

/

REPAIR / REPLACEMENT?

MATERIALS CHANGES 7 FAILURE ANALYSIS?

DOCUMENTATION: A/,

/w

//2 4 /e-e,o.. l- '<_

d JA M-r.,

t 9ea n 2,ryc,o2 n s- )

s

r. L a

i

()

i u

1 l

m

' UMTED STATE'S GOVERNMENT L29 840703

g3a, Memorartdum TENNESSEE VALLEY AUTHORITY To J.(A. C f

, Site Director, Browns Ferry Nuclear Plant H.

I Aber rombie, Director of Nuclear Services, 1760 CST 2-C ynv >x JUL 161984 nm BROWNS FERRY NUCLEAR PLANT UNIT 3 - METALLURGICAL EVALUATION OF CROSSA

.s ruerT:

PIPING, EXTRACTION STEAM PIPING, AND EMERGENCY EQUIPMENT COOLING WATER (EECW) PIPING FOR WALL DEGRADATION Attached for your information is a copy of the inspection report pertaining to the subject piping.

9 H. L. Abercrombie WSW:GJP:TRW:FSD Attachment oc (Attachment):

NUC PR ARMS, 1520 CST 2-C This was prepared principally by T. R. Woods.

B2172B.FD

?,

.hh\\

m Buy I'.S. Savings Banch R. ::nlarly on the Pay. roll Savin;;s Plan

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