ML19345B889

LER 80-028/03L-0:on 801105,while Diesel Generator DG-1 Was Started & Run to Operating Speed,Buzzer Which Tests for DG-1 ready-to-load within 10 Seconds Failed to Sound within Required Time Limit.Cause Unknown.Diesel Retested & Started

ML19345B889
Person / Time
Site:	Fort Calhoun
Issue date:	11/12/1980
From:	Mueller R OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19345B890	List: ML19345B889 ML19354C387
References
LER-80-028-03L, LER-80-28-3L, NUDOCS 8012020679
Download: ML19345B889 (4)

Text

, , , , ,

LICENSEE EVENT REPORT ccNTact stccm I (PLEASE PQiNT CR TVC'E ALL REculOED INFORMATION) t  !  !  ! 1 l l o li 4 a l N ! E l F I C l S l I I@l 0 I 010 1O l n l o l o l n i n I n l asq l@l u.cENsEE a 0E :4 :s uCENsE w e m a 411 11 il 11 l@lv uCe.sE TuE a .A: w@

ccvT ial'I 3

lcl*c! I L Ql 0100CK 50 il 5 ETt 010101218 NLvaER dd 69I 5 @l 1 11 10 ( 5 t 810 @l 1 I l 11 I ? I iv ENT O ATE '4 75 aE7CA T O A TE dJ EVENT csscaiPTicN ANO PROB A8LE ccNSECUENC5s @

!a12l t At 0850 during the performance of ST-ESF-6. F.2. diesel cenarator nG-1 m o=, w I 13 ia ; I and run to coerating sceed. However, the buzzer which tests for DG-1 "readv-to-leadt ioiAi ! within 10 secones failed to sound within the.orescribed time limit. Uoon subsecuenti t o is! I retesting, the DG-1 diesel generator failed to start upon actuation of channel A l

' O i .s j I full sceed test switch. As a result of OG-1 failure to start, the redundant diesel I

ai-1 I generator was satisfactorily tested for coerability and it was verified that there I i2,3i i were no associated incoerable safeguards equipment. $0 J

7 5 3 00MP. /At/E SYSTEM OAUSE CALSE SLSCOCE COMPCN E NT OOC E CLSCOCE SUSC00E 000E COCE 13: 31 I El El IX lXl 12 lE IN G II IN lE l@9l Il@ l Zi@

'O *a ;c

' 5 3 70 1i AEvis.ON SEOL ENTI AL OCCU A RENCE aEPCRT a E8C AT NO. COCE TV NC.

a ao ENENTvfAq

• E'C "

mygEa 18 ! 0 l l-l 101213I l/l l 01 31 1Ll [ ,_,l l 01 JJ 24 26 2' :S 29 31

!' 20 20 ATT ACHM EN T NP R O-4 # A:VE OOMP. 00VPONENT ACTiC N *L*LAE **:ECT S-UTOCWN

_2 3CA M w 3. SL Poy ER MANLFAO LaEA AKEN ACNON ONpLANT vsT *C3 *CLAS - 3L S MIT* E O I.l@ l 01010 t ly A l@ l SI Cl 6l 6l@

lX QIXl@ lI!@

4 4 .=

.6 l

to lN u l@ lN n

l@ .A o causE essesipT:cN Aac ccaascTive AcmcNs @

l t i i:! I The cause of CG-1 failure to start cer the cnannel A full soeed test switch is un-av kncwn. It was costulated that certain relav centacts, switch centacts. etc.

I l !!I

- ,  !)

have coerated imcrecerly istuck), hcwever, wnen investicated.all circu'trv coerated !

In acditicn an air ccmoressor was found to be oceratinc imcreceriv. The!

iiil croceriv.

I is iA i i diesel was retested and the diesel started and was "readv-to-load" within the ore- so aa scr1 cec time limit, , VE*wCO CF F AC:u'v CTwER STA*LS DiSOCVEAv OISCOVERY OE50AIP* ION s.

STATLS  % 7CvvER SURVEILLANCE TEST l IiisllEl@ l0Ia10!@l 11 NA M

I IBl@l 45 46 30 3 3 13 1 AC'tVITY CONTENT

~ LO, CATION ?F AELEASE

• 2ELEASE* AMCUNT 08 AC*tVITY NA l It i s j l Zl @"F mELEASElZl@l NA l l 30 7 . , w n ..

8E: SON'.EL Ex 7CSL AE1 NLvBEA SPE OESCulp'1CN l

i- i !i 3 ,

1010!0@l2!@l n :2 u

.8 sa 35PSO'+NEL NLAIES

% veEm OE3CRIPTf 0N

• i NA l 14i3 I301 01 0 @l

' 11 '

3c LOSS Os OA C avage TO #AC:U'v Q

• v'E O E50=18 *:ON N./

NA  !

l' 6 :l, ,lZ l@l, m

30 sec uss cNLY 33fiEco.... , @ ,

10 ! a l i Nf81 NA (\< s  ! IIIii11iIII'  ;

7 aa a g sa as 202 J26 J011 uvEc,,=E.4aEn Randy Mueller eq ,-cN E; g 0

120.eo G74

LER No.80-028 Cmaha Public Pcwer District.

Fort Calhoun Station Unit No. -l Docket No. 05000285 4

l Attachment No. -l

~

. Safety Analysis

-The Fort Calhoun Station Unit No. -1 is so designed that.no single failure, by itself, can' adversely affect the ability of.the plant to safely shutdown in the event of an accident. During the time CG-1 failed to start (automatically), the 161kv and.345kv offsite power feeds were energi:ed and available. In addition,'the redundant diesel generator DG-2 was verified to be cperating correctly and it was further verified

. that nc other engineered safeguards ccmponents associated with DG-1 were inoperable. As such, the consequences of an accident wculd have been more than adequately mitigated had the unlikely event of an accident L occurred.

4 A

?

~~

ilAf I

j

LER No.80-028 Omaha Public Power District Fort Calhoun' Station Unit No.1 Occket No. 05000285 Attachment'No. 2 Corrective Action M.0. #7757 was written to investigate reasons for diesel generator DG-1 failure to start upon the second actuation of the Channel "A" full speed switch, as well as, the failure to get the buz:er, simulating tne diesel is ready-to-load, when the ready to load light came en during the first actuation of the Channel "A" full speed test switch. As a result-of this 'aintenance investigation, diesel emergency start circuitry was checked for loose wires, bad or faulty. relays, failed or stuck switch contacts, etc. However, the results proved negative in that no probable cause of the diesel failures mentioned above has been positively deter-mi ned . In addition, a diesel air compressor was fo"7d to be ocerating i improperly,' but still maintaining adequate pressi . to accommodate diesel start.

l After all applicable items had been checked, and found to be in operating order, the diesel generator DG-1 was again tested for operation per the channel "A" full speed test switch. The diesel started and was

" ready-to-load" within the prescribed time limit.

Therefore, the failures of '.he diesel to start have been undeter-minable.

4 T

\%

\

g.;

, _ _ - . _ - - . . - - - . . l

LER No.20-028 Omaha Public Powar District Fort Calhoun Station Unit No. 1 Docket No. 05000235 ,

Attachment No. 3 Failure Data This is the first failare of this type at Fort Calhoun Station Unit No. 1.

\ s

(  %

N .

s

/ 'f l

. i e