Text

Part 21 & Deficiency Rept Re Notification of Potential Safety Hazard from Breakage of Cast Iron Suction Heads in Apkd Type Pumps.Caused by Migration of Suction Head Journal Sleeve Along Lower End of Pump Shaft.Will Inspect Pumps
	ML20236N675
Person / Time
Site:	Hatch, Hope Creek, Susquehanna, Limerick, LaSalle
Issue date:	07/09/1998
From:	Hendricks R; INGERSOLL-RAND CO.
To:	Gould C; NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
	REF-PT21-98 NUDOCS 9807150207
	Download: ML20236N675 (7)
	v • d • e

- - - - ~ - - - - - - - - - - - - - - - - - - - - - - ' - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

" - - - - - - - - - - - - v - --

, ingersell-Dr:sser Pump Company sketzeered rump cearp m wmorwi Pam Phillip burg,. %J OWG 09 JY 98 Fax # 301-816-5151 7 pages total sent US Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Attn.: Mr. Chancey Gould

Subject:

10CFR21 Deportability of a Potential Safety liazard from broken Cast iron Suction lieads in APKD Type Pumps

Dear Mr. Gould:

Per our telephone conversation this aflernoon, Ingersoll-Dresser Pump Company is

hemby notifying the NRC about a potential safety hazard from potential breakage of L cast iron suction heads in APKD type pumps located at seven (7) different Nuclear j sites.

! Enclosed please find the engineering background, evaluation, conclusions, recommendations, typical component sketch, and a listing of the utilities, sites, pump types, order numbers, quantities and pump serial numbers that may be affected.

If you have any questions from an engineering standpoint, please call Bob Cornman at (908) 859-7256,' and for quality control issues call me at (908) 859-7298.

i Sincerely yours, i R. A. Ile dricks Quality Assurance Manager RAll:sla i CC: R. Rajeski V. P. and Gen. Mgr. Engineered Pump Group \

W. Ord President Engineered Pump Group R. Cornman IDP - PE f t

C I, Enclosures /

. , .I 7 9907150207 990709 PDR ADOCK 05000352:

S PDR m, ingersell Read ' Ped & Worthington Pievgor klence Jewment khneider Pumps

The purpose of this letter is to update the NRC on the Ingersoll-Dresser Pump evaluation of cast iron suction head damage experienced by one utility on Residual lleat Removal (RilR) pumps manufactured by ingersoll-Rand Company. These pumps are of the model APKD designation and were manufactured in the mid 1970's.

BACKGROUND The suction head (part number 360 as shown on Figure 1) is a cast, structural component that holds a bearing located below the double suction first stage impeller on the APKD type pumps (refer to Figure 1).

The bearing holder is connected to the outer portion of the suction head with three or four support ribs depending on the pump designation. 'Ihe suction heads were made from cast iron.

In addition to Ri!R applications, APKD type pumps in several different sizes have been supplied for Low Pressure Core Spray, and liigh Pressure Core Spray applications. Figure 2 contains a listing of the APKD type pumps supplied for various applications.

The problem was initially noted at the PECO Energy Limerick Unit #1 Nuclear Power Plant in May 1998.

While investigating clogging of the #2 Jet pump, a piece of metal was found inside of the reactor vessel which ultimately was traced to the IB RilR pump. A visualinspection (boroscope) of the 1B RIIR pump revealed that a portion of the suction head was missing.

OBSERVATIONS After a careful review of the information from the Limerick site and the inspection of the 1A & 1B RilR pumps, the following observations have been made:

1. On the 1B pump, the lower bearing bracket broke off and became lodged in the inlet of the pump. i This was evidenced by the wear pattern on the hub area of the bracket. In addition, the leading I vane edges at the inlet of the lower eye of the first stage impeller had damage that appears to have been caused by contact with a rib of the bracket.

2. All bearings (except for the damaged suction head bearing) and impeller to casing wear ring clearances were measured and found to be within tolerance.

3. Overall, the IB RilR pump was found to be in good condition. Two minor indications found on the #1 & #3 outer casing vanes required minor work to blend by hand grinding. ,

l l 1 4 The inspection of the 1 A RilR pump revealed that the suction head of the 1 A RHR pump was )

found intact. The suction head journal sleeve (part number 135A on Figure 1) was found to have l moved approximately one quarter inch relative to the shaft.

5. Inspections of both the IB & 1 A RIIR pumps indicate that downward movement of the suction head journal sleeve was wearing the key (part number 291 on Figure 1) installed to prevent rotation between thejourna! sleeve and the shaft.

6. The 1B RilR pump is of a similar desi nF to the 1 A Condensate pump which experienced a suction head failure in December of 1997. Information obtained from the plant suggests that the 1 A Condensate pump may have been operated in a failed suction head condition with no noticeable degradation in performance for 12 to 18 months of continuous service.

I

7. A suction head failure as observed on the 1B RIIR pump would be expected to change the l

vibration response of the pump; however, the vibration data for the IB RIIR pump and the l A i Condensate pump did not indicate an abnormal vibration response during normal operation.

l

8. The 1B RilR pump had passed all ofits surveillance test requirements.

l

9. A mathematical analysis performed on the suction head, taking into account the expected mechanical, hydraulic, and thermal effects, did not indicate sufficient loading to cause the failure.

CONCI USIONS The failure mode of this suction head appears to start with the migration of the suction head journal sleeve along the lower end of the pump shaft due to wear of the key that holds the sleeve in place. ~1his is a result of the accumulated operating time on tM pump. Once the sleeve is detached from the shaft, it is able to move in the lower portion of the pump and strike the suction head causing breakage of the support rib.

I As demonstrated by the experience with the l A Condensate pump, a pump can operate without a measurable degradation in performance for a period of time with a suction head failure. Gradually, a decline in performance would be observed over time. The expected trends that would result from a pump operating in this degraded condition would be a deterioration in the head' flow characteristics of the pump ,

and a corresponding increase in vibration.

The failure of the suction head would not likely result in an immediate pump parameter change unless a

, portion of the suction head became lodged in one of the pump impellers. It must be noted that at the Limerick I site, both the 1B RIIR pump and the 1 A Condensate pump passed pieces of broken suction head rib without affecting the pump operation.

RECOMMENDATIONS Ingersoll-Dresser Pump's recommended action plan for those pumps listed in Figure 2 is as follows:

1. Inspect pumps at reasonable intervals for possible damage to the suction head, suction head journal sleeve, and retaining key.

2. If the surveillance testing has shown a recent degradation in the hydraulic performance of the pump or a recent change in the pump vibration, then the pump should be inspected immediately for possible damage to the suction head' suction headjournal sleeve.

3. When required, a replacement suction head manufactured from carbon steel with additional rib stiffening and a suction head journal sleeve with improved axial positioning should be installed. !

4. Monitor vibration on the pump shaft and motor housing and increase the frequency of the surveillance testing until an inspection of the suction head, suction head journal sleeve, and retaining key can be completed.

rec 98030B

\

I

______________________-______-_____a

e

. x 4N e

im u ,.,

h<w U D.i

.j

\

N

< sci me. $,7 vtE E m

" ! .* r, v uec e a - p Nk-v95*

hy,,x x

.. d!'?

pe rf

- (s '

3c s

e sse w_ ,..=5 7 y ,

,e -

i i ,

vu , :, . .

.,.I.J,g ,y f e

~

9 , ; -*4...! e ,

vi ("bh.kh#/ .I

'- . , s N' /

k""'

~., N . q.e, j ..-

y

,, s r: 5 :a

\ en

,, b w; e' 1 ou, i,___ - : - eic

. , / ilnl' \ \ s.

~

p . . , ,

,, :i

. !.i t

r-7

/ ..u/

f'

. l=i :W.!

l

, ir ,

tt

,.,y 'h l-l d l - 1[I 3 _ . . ,

e.eu q :lf],710l)17 f i

l \ n h i (J e

eeu-W p.3=) .

f._(1, I

. 1, Ftr oC t .

\

., '! . .f.:

t l / S y

_8,.'

VI Pl ! . 1 I i.ece m d4"---i- + - ^t. .U ! ] ,$

w

,e - , ,

{

, !f . i . $.

' \

. .. , e s ,c,r,i x

L

_ g'._ ,,

I 1

" +

) 8 '"

y . . #r 3iy J '"

t

,.i.cl -J, j!h~* , yNh4==

+

at ,

I og ,

D98 u .a. .

O ,Y' G en

,c, l-f . _]b; s q", ei ec k. . r. -5.0.:.t!.:. 3

9. D. ,

t -\ ot-.--~< 1

, o,, r . .,

\

v6L z

,a g ,,

y e

r a y y r R R R R e a e a o y a p H H H H r o r p

r o p r C r S R R R R C S p

e C S P.. S r o

L C

4 4 4 4 4 4 4 2

. k 4 -

2- 2 6 6 4 5-

_ DK D D D D

D D D K K K K K K K P P P P P P P P A A A A A A A A 4 4 8 8 5 5 5 7 3 3 2 2 2 2 2 2 j/ & y n n a

/ a n

a t h

w w , c . n

, s 1 2 ia n, ia n le k o i y # # a. a T ha 1 1 E e C h y T, hs # y # e e e C, a y . .

r r g k g k P 2, s g k a g k a e

r ic P n e n,r r

e kr n, 1

in # i hn r e nc P e nc P r ic v e C

ow#1 n e n h n n e n ,

n e n.

r e p P na E n w E mw a C, n a C, n E w E nr w S o OL irtos O L C , s i o t h

s er a h s er a OL im to O Li, to c H n h n a s a C , in w w in w w C , s s il s, E o. o C

t t i w b

wn ia t . .

E o o E o to h o ia h o ia E o to t

u a ia h P C P P C P C P T C P T P C P P C P P G T C T c ip c ip p c p p ic ip t ic ip p ic mqiu e n t

c iu t t ic n iu t t imqu ne t t i

u n n imq n mqu n n to E m m

to E Li q .e im iu q e e mq = u i e

y E q e A r r A toE m to E m to E m toer ib toe m m e

t r A r r t A r t A e r t r A A re t A r t w pa r

- - e p, - e w pa - e w pa - w pa - e ap -

w p r

a - e w pa r

w w E o e E o e E o e E o e E o e E o e E o e E o e G P D G P D G P D G P D G P D G P D G P D G P D 8 9 0 1 2 3 4 5 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 5 6 7 8 2 3 7 71 8 8 81 8 8 8 81 8 9 91 9 1 9 9 9 2 2 1 2 21 3 3 31 3 7 7 7 7 7 7 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 1 1 1 1 1 1 1 1 2 2 2 2 7 7 7 7 7 7 7 7 7 7 7 7 7 7

_ 7 0 0 7 0 7 0 7 0 7 0 7 0 7 0 7 0 8 0 8 0 8 08 0 8 0 8 0 8 0 8 0 7 0 7 0 7 0 7 0 7 0 7 0 7 0 7 0 4 0 4 0 4 04 9 9 0 0 5 5 7 7 9 9 0 1 1 1 1 2 1 1 1 2 1 1 1 2 2 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 6 6 6 6 6 6 6 3 M E

3- EM 3 M 3 -M 3- EM 3 ME 3- 3 M 6

0 T 6 0 T 6E 0 T 6 0 T E 6 T 6 0

T 6 6 E

0 I

0 I I 0 I I 0 0 TI 0 0 0 0 0 1 2 3 4 5 6 7 8

!\lfl ' j1 lf,i l1jl' l] lll 1 llli I ll ll 1 l, E e h y E E E R R F. a R Y R Y R Y O Y OY C r p R R OA OA R

R H

OA C R A C- A R M S H H C. R -

P e R C. R P C. P R P CS P

C 9 r o

R P. S P. S P. S U u S S C L L L N u -

_ M y

s i

s 3 1 1 4 2 1 i

- s 2 3 4

- U G

e 5- 8-E 3- 3 5- 5- 2- -

Z 5-D D D D D D D S D I

D K K K K k K K K K P P 0 0 P P P P P P 2 2 A A A A A A A x x A A 9 9 9 8 7 2 2 L 7 9 2 2 2 2 2 1 1 2

s P 2 s

n. n n n n n n o o

@ a o ./ os ,

o o s , s , s ,y is

- h s , y i ty t

. sn di ty d

. t i y d ty 'v o d n d

E un t

n o.

~- d t n n E u n E u C a C E u'

- @ C oi h E. u o E

h o u h o h o r r a h o h o C, ta C na C e ig e ig ta C ta C E r ta C wro wr e e ne o eo e 2 e ne e t

l e e e mn o e m, ua

- ~

A N P w

o# a.SaC t wf a n

o S wa n S . aS 2 P G.

2

a P

G, , S v

w a n

o Sa T n - a

. a s o a L, iso

.v.L,a #

hc iagr y h ig y . a L. isno m L, s i . is c o ler no oi a s m L,. a m .. r io N o o ie nhi L, io m m

m o oi. n o

w . . n u o n a e as o o in i

A w t ta e a a . a Cw oi o ok C C n i

L C C C C N h

H GB H GB C C m C s l

C C h I P T C T I t if p

c )p ) )

p ) p t ciapu nit u en2#

_ )

)

n #e icip L )

ci;p u 4.=, 2# ii t

cip 1 i ip 2 c iu u n e mqe #n i

t J t 1 t 1 mq i

mq -i E

R iu mq -- imq oE u ne #

m#

i i que n #

e ivE mne o E imq e o E mna A r d a i q e e i E m u oE i t oE mnea A;u E r mn ea

.i q O o E t

t o M u t t t A r t a A r t t

a A r t A re a t r A r i A r t r

e r

T - e e e wpa S wpa S r -

r e r e S - -

wpa S - e S - e a S wpa S - wp E ow m EGPo De L(

r 'w EGPowpDe (L U E o A w a E o e a L E o e aL E ow @eLa E o e GP D a E o e GP D aL _

GP G GP D

(

C GP C GP D ( GP D ( (

1 2 3 5 6 F 4 5 9 0 1 2 3 4 2 3 0 3 4 5 6 4 4 2 2 _

0 4 4 4 4 L

A 7 7 2 3 3 2 2 2 3 3 3 2 2 2 1 1 3 2 2 2 2 1

2 2 1 1 2

1 2

I 1 1 7 7 7 3 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 R 2 2 2 2 2 2 8 8 8 8 7 7 9 9 E 90 90 2 2 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 S

2 3 5 5

j 1. s 5 2 2 6

2 1 6

2 2 3 3 3 1 3 2 0 0 2 2 0 0 w0 e

1 0 0 6

0 0 6

3- EM 0

6 0

6 0 0 6 M 3-6 3 M 6

M JM 3- EM 3- EM 3- 3-6 6 E 6 E

5- E 6- E 6 6 6 6 T 0 T W3 i

6 T 0

I 0 T 0

0 I 0 0

1 TI 0

0 T 2

I 0 0

3 TI 0 0

4 0

0 5

0 0

6 I

0 7

1 I

4 9 1 1 1 1 1 1 1 h

W T

I il! 'l

WE E E y y R Y R Y a r a r

imR t H OA R

OA R

R H

R H S p

S p

t 8 R C. P C. P R R R e r

e r

t P S P. S o o s L H C C Y

T I

T N3 1 1 4 4 4 4 4 A

U Q

_ $ 3 i 8 4- 4- 4- 6 6

$ -D M D D D D D D

$ K I K K K K K K K

$P b A P

A 0

2 x

P A

u9 2 9 2 4 4 4 5 5 P 2 1 3 3 3 2 2 r

T@ mn mn T

m n /

_ &. ' o o c e tg o ic e o ic e o t c

t h M C ,[

g M b ts t t

_ h s tg s tg ig -

C.

_ y n d y n tM y jn le k U L Du t t P S hg P tu Sy hi Pu S h E e e e 1 1 L L A s s y s r a &r a &r & n a & nn a ly p a mlp a mlp a ic C n e n e r n n n e e nn r

M m p W o p W o p W v r e n a w n aw e e wP a 2& owP ,ha 2&

_ 1 tog S d, 0

u tg u n Sr dr

, tg u n S d, e p S o he o P

h o o k ,he T n r r N e fo N i r ic Hs, u .

e P u . P c u P cki eu I

e fo hs er o f 1 1 W s U a Pwn PW o a H

s a

WP H wo na a own WP H a l

b u a P G q

s u

S P P n

n .

e a q n s n u e S P P a.

n n

iwqs s e re u o P B S N n wq .

n r s s e e u o P B S N t p )

p

)

p p

c ip 9 e iu a 2 imq e # imq

u t

i 2) c iu ne 2# cimq t p iu n t c ip imq u n t

ic mq iu ne t ic mq iu t n

c ip imqu t

ne E m Eq .-

r R e e e d to E md to E mdr o E m o Er m o E m o Er m to E m Oh T A re . ro A re t r

r o A r t r

t o A r t r

t A t r

t A r t r

t A t A r t r

n - a n - e a n - e a f f e a - e wpa e ra - e pa

.rf S - w wp a w p wp wp w OE o a H E o e E w p Ha E o e E o e E o e E o e E o e

- CGP C ( GP D H( GPo D e

( GP D G P D G P D GP D GP D W1 L 1 2 3 1 1 7

7 6

2 6

3 7 8 3 3 9

3 8 9 0 0 0

1 1

1 2 3 4 5 1 1 1 1 9 0 1 7 8 8 8 8 8 8 8 2 3 4 5 6 A 1 1 1 2 1 1 1 1 1 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 I 3 3 3 3 3 2 2 2 2 3 3 3 3 3 3 3 3 7 7 7 7 7 7 7 7 R7 7 7 7 7 4

7 7 7 7 7 7 7 5

7 5

7 7 5 5 5 5 0 0 0 0 0 0 0 0 E 4 4 4 5 0

1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 8 0 0 0

^

0 1 1 1 1 j

i t5 4 6 7 6 9 9 1 1 4 4 1 4 1 4 2 5 1 5 2 R0 0 0 0 0 0 6

0 0 6

E 8 6 6 6 M 3- EM M D 3 -

3-6 3-6 3-6 3

6- ET 6 3 -M 6 E 3

6- ET R 60 0 0 0 0 0 T 0 T 0 C0 0 0 0 0 I

0 I

J 8 9 0 1 2 3 4 5 E

M1 1 2 2 2 2 2 2 Tl l

ML20236N675

Text

Subject:

Dear Mr. Gould:

Navigation menu

Search