ML20064K106

Part 21 Rept Re Spring Defect in Six Emergency Diesel Generator Sets Supplied by Cooper Energy Svcs to Nuclear Facilities.Caused by Cracks in Base Metal Resulting from Electrolytic Plating.Spring Will Be Replaced by 780930

ML20064K106
Person / Time
Site:	Waterford
Issue date:	07/25/1978
From:	Bender B COOPER INDUSTRIES, INC.
To:
Shared Package
ML20064K097	List: ML20064K096 ML20064K100 ML20064K104 ML20064K106
References
NUDOCS 8009290401
Download: ML20064K106 (2)

Text

.

(N .

(

f} I I n L.t: En t: t's C.

' p'- '1 C00?Ei1 E!:ERGY SEP. VICES CNNie l ~

""4 M y 25. 197G .

Office of Inspection and Enforcement .

U. S. Nucl ea r F.egul a to ry Conmi ss ion .

Uachington, D. C. 20555 *

.. .~

u. .

ATTH: Director of Inspection and Enforcecent -

Gentlenen: .

a. .

i In accordance with ICCFR Fart 21, this letter will previde noti fi ca t i c n of a defect that has been determined to exist in six ecergency standby diesel-cenerator sets suppliad to nuclear facilities by. Cocper Energy Services. .

Four of the diesel-generators in question were procured by Sechtel Ccrperction , San Francisco, California for the Fcansyl-vania Pcuer and Light Ccrecny's Su:quehanna SteE.7 Electric Station at Ceruick. P ennsyl van i a . The reczining two were procured by Ebasco Services, I n co r;:o ra t e d , iMw York, U.Y. for Louisiana ?cuer and Light Company's Waterford Huclear Station #3 at Taf t. Louisiana. .

.c The defect e.xists in a spring which operates the overspeed

shutdcun butterfly valve en the eng'ine turbechcnger air inlet

\ connection. The spring is picted with eicctrciytically deposited i

cadniun to prevent corrcsion. Several identical springs have recently failed on units ttill in the process of nanufacture at C.E.S. The c use of failure has been deter =ined to be cracks

in the bcsc retal,' caused by tne electrolytic plating process.

l Although the springs tnat are installed en the above identified delivered units have not failed, the possibility of eventual failure necessitates replace = enc cf the spring on the delivered

. units. .

Hone of the delivered units are operational at this tice, so l

~

there is no actual sa fety hasard crea ted by the defect. If the l

units were opera:icn:1 and the spring uere to fail, ene of the two overspeed protection cevices provided on each engine uccid fail to perforn. However, the other overspeed protectien dcvice,

a fuel shut-of f techanisn activated by a nechanically driven

. . - - - . . . - .....__..,s e<-...s ,os

.,,s r--.

. s-

_c a..--u- _s ...w,

, ...c ..,4....

-. .. . e. 4. i.. ... ~ . . . -

tiould provide independently ef f ective engine overspeed protectien.

UCL v

(. C00Firi trit r.0Y,5tr.VitL

(

The equipnant identified in this letter is the only equiprent delivered to a nuclea r f acili ty by C. E.S. ther. could contain the defect described. .

The spring will be replaced with one cade fro:, a caterial that util not crack uhen cadniun plated. The C.E.5. Cus ter:cr Se rvi ces departrent is responsible for a c cc r.p l i s h i n g t'he rep l a cece n t ,

which we expect to conplete by Septer.ber 20, 1978. .

/ / .'j/ m/ .

,[

~

f . 1 0 , ; 0 :' n . u q .

B. D. Bender. Vice-President Operations -

. . ;+ ,

.r; ; .  ;-

BBS/jvl -

J. R. Schr.iedel. Profect Enginecr cc: .-.

Bechtel Corporatica _

/ .. .;

l.-

P. O. Eox 3955 -

. San Francisco, CA 94119 . ' -; 2. ..

~~

- - ~

D. Sandi forth , Supervising Engineer .

Ebtsco Services, Inccrporated .

?.

~iwo Rector S tree t

' ' ~

Heu York, H.Y. 10006 .- -.

S pinnen, Site Quality Progr..= Mcnacer ,

",' ~

P.O. Ex 70 ,

Itillo:n, Louisiana 70 % 6 <<.- + *i- '-

t .

- I b

. e s