05000312/LER-1978-009-03, /03L-0:on 780913,diesel Driven Fire Pump P-996 Tripped on Overspeed During test.Engine-to-pump Coupling Bolts Were Discovered to Be Sheared,Probably Due to Overtorquing.Bolts Were Replaced,Torque Values Verified

/03L-0:on 780913,diesel Driven Fire Pump P-996 Tripped on Overspeed During test.Engine-to-pump Coupling Bolts Were Discovered to Be Sheared,Probably Due to Overtorquing.Bolts Were Replaced,Torque Values Verified

ML20147C933
Person / Time
Site:	Rancho Seco
Issue date:	10/05/1978
From:	Colombo R SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML20147C911	List: 05000312/LER-1978-009, Forwards LER 78-009/03L-0 05000312/LER-1978-009-03, /03L-0:on 780913,diesel Driven Fire Pump P-996 Tripped on Overspeed During test.Engine-to-pump Coupling Bolts Were Discovered to Be Sheared,Probably Due to Overtorquing.Bolts Were Replaced,Torque Values Verified
References
LER-78-009-03L, LER-78-9-3L, NUDOCS 7810130190
Download: ML20147C933 (1)

LER-1978-009, /03L-0:on 780913,diesel Driven Fire Pump P-996 Tripped on Overspeed During test.Engine-to-pump Coupling Bolts Were Discovered to Be Sheared,Probably Due to Overtorquing.Bolts Were Replaced,Torque Values Verified

Event date:
Report date:
3121978009R03 - NRC Website

text

e b

(

NRC 7 ORM 366 U.S. NUCLE AR R ECULATORY COMMISSION

]'

D 77) 3 LICENSEE EVENT REPORT EXHIBIT A L

l CONTROL BLOCK: l l l l l l l@

(PLEASE PRINT CR TYPE ALL' REQUIRED INFORMA,lON)

'r 1

6 3 lC lAlR !SlSIl !@14l Ol0 l -10 ! 01 ol0 l Ol-l O!0 l@!4 ll I 11 il ll@l ! l@

i I

8 9 LictNsti C006 14 Lis& %iN.ve4H

• a ao LIC t *46 1774 JJ U 6A T bd g'

CON *T E

s'fi% LL'@l01 S f o I o I o! 3 ! Il2 Glo 191 1!3 '7 18 l@lla ! ois '7 18 l @

i' P

8 t,J 64 OQJKET W Ygte

.,o en tv&NiCATE id 4

FiPOR T OATE dJ EVENT OEsCRIPTION AND PRCS ABLE CONsECL'ENCES h

@ IDurine start tests followinn maintenance. P--9 9 6. the Diesel Driven Fire i

o 3 l Pump, tripped on overspeed.

An investicatien revealed the engine to cump I l coupling bolts had sheared.

Contrary to T.S., only one high pressure t

o 4 l'

lo ITI Inumn was available at that time.

The redundant mn t or-d ri ven nu m. P-440. I Io lc l lwas available at all_ times durine the occurrence.

~

I 0 7 l

.l.

\\

't D

10181 L_

I s

eo so OE COpt SueCO s COYPONfNTCoot

$ se d$

su E

8 I AlB l@ [Bj@ (cj@ l MJ E lC i F [U lN l@ [Zj@ [Z,,J @

7 8

9 10 11 12 IJ H

19 2J Sf 0 VENTI AL, OCCUR Rf r.CE REPORT RE VISION.

Lg g IVENT YE AR REPORT P.O.

CODE TYPE NO.

@,ag; fro l71 a1 l---!

In In fo I Ld h 111 LIJ L-J b.J

, 21 22 23 24 46 27 28 29 3J 31 32 KN ACT C ON PLANT HOURS 22

$8 i FC 9.

$UPPL E '

A NU, ACTUR $ R [A_J@[Z_J@ _ [Zj@

[,,ZJ@

10 l 010 lo l [f_j @

[Yj@

l A l@

l K ! 2l0 l Ol@

j 3J J*

3a

.o 3 s.

40 el 42 A3 44 47 cause oEsCRiPriON AND CORRECflVE ACTIONS h g IThe probable cause was overtorouine of the coupline bolts durinc initial I

g l installation.

The bolts were reolaced, proper alignment verified, and ther ECO ltorque values on replacement bolts verified to not exceed recommended I

g lvalue.

l E..I l

T i

.0 si U

%POeER OTHERSTATUS D SCO RY DISCOVERY CESCRIPTION [T,_j @ l1 ! OI Ol@ l NA l [B_,J@l Maintenance Testint l

l i s

' A!TiviTv CC'dTest L7J AuCUNTo,AermTY @ l to:AvieN o, R,uis @

ReuAm@eP iamLLIS!

NA l

NA l

i r,

' nR$eJL.,Ou,rs cesco,TieN@

Nuo.r.

TYP 8101 ol 0 !SL?J@l NA I

nR3esNd'i J es eu:R.PTiON@

uuv i.

i* l01Olfj8l NA l

n u

a Lost CF CH D AYAat TO f ACILITY TYPE C E $CAPitC N Q [JJ@l NA l

4; 7

R 9 IJ 63 s

?

O!S RIf f'04 Q [$3UEYJglLocal newspaper and wire service 9-21-78 l ltll!Ill!II!!

,j R. W. Colombo (9Y6f' 452-3211 3{

NAVE OF PREPARER PHONE:

i

q t 7 7/cG0/ 90.

m - - --

ig