ML20063A068

Responds to Requesting Addl Info Re NUREG-0737, Item II.K.3.17, Rept on Outages of Eccs. LERs Re Maint Outages Encl

ML20063A068
Person / Time
Site:	Fort Calhoun
Issue date:	08/19/1982
From:	William Jones OMAHA PUBLIC POWER DISTRICT
To:	Clark R Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.17, TASK-TM LIC-82-298, NUDOCS 8208240178
Download: ML20063A068 (36)

Text

...

Omaha Public Power District 1623 HARNEY a OMAHA, NEBRASMA 68102 e TELEPHONE S36 4000 ARE A CODE 402 August 19, 1982 LIC-82-298 Mr. Robert A. Clark, Chief U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Operating Reactors Branch No. 3 Washington, D.C.

20555

Reference:

Docket No. 50-285

Dear Mr. Clark:

NUREG-0737, Item II.K.3.17 Report on Outages of Emergency Core Cooling Systems (ECCS)

The Commission's letter to Omaha Public Power District, dated July 14, 1982, requested the District provide additional information regarding the subject TMI Action Plan item.

Accordingly, the attached Tables 1, 2, and 3 provide the information requested by Item 1 of the subject letter and the attached Table 4 provides the information requested by Item 2.

Table 1 specitically identifies diesel generator outages resulting from surveillance testing activities.

Tables 2 and 3 detail diesel generator outages resulting from component failures identified by planned, un-planned, or preventive maintenance.

Table 2 includes all planned and preventive maintenance outages and Table 3 identifies the unplanned maintenance outages which were reportable as Licensee Event Reports.

Table 4 addresses all ECCS component outages resulting from surveillance testing.

In most cases, the exact duratir,n of a specific surveillar. e test was not available, so a best estimate, based en the average aui ation of completing the test, has been provided.

It shoulo 31sc be noted that removing a component from service for surveillance testing does not necessarily render that specific ECC train or system inoperable. As an example, Surveillance Test ST-SI/CS-1 (listed in Table 4) requires the 00 8208240(7%

?

Mr. Robert A. Clark LIC-82-298 Page Two operability testing of all safety injection and containment spray pumps, one pump at a time. Although one pump is removed from service for testing, the additional redundant pumps permit the system and its trains to remain fully operational.

Sincer ly, l$ wp W. C.

nes Division Manager Produ'c' tion Operations WCJ/TLP:jmm Attachments cc: LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.

Washington, D.C.

20036 l

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.i TABLE 1:

DIESEL GENERATOR OUTAGES FOR SURVEILLANCE TESTING Surveillance Test, Section Frequency Date Duration

• Component (s)

Remarks ST-DG-2; F.1, Annual 3/12/76 84 hr.

DGl During Cold Shutdown F.2, F.3 3/14/76 Diesel Gen. 1 2/26/77 Inspection and Overhaul 2/10/78 2/13/78 2/13/79 2/16/79 11/16/79 11/11/80

'I V

V V

11/13/80 ST-DG-2; F.4,F.5, Annual 3/1/76 84 hr.

DG2 During Cold Shutdown F.6, Diesel Gen.

4/20/77 2 Inspection and 0

Overhaul 3/16/78 3/20/78 5/4/79 2/15/80 I

V v

V 2/18/80 ST-ESF-2,4,13;F.1 Monthly 1/22/76 4 hr.

DG1 h

el fg 2/26/76 0

Not Performed-Cold Shut.

lnjec.

Actuation, 3/23/76 4 hr.

Containment 4/22/76 Spray Actuat.1on and Recircula-5/20/76 tion Actuation 6/24/76 Signal Tests 7/22/76 8/26/76 9/23/76 V

10/21/76 0

Not Performed-Cold Shut.

y V

11/8/76 0

V Not Performed-Cold Shut.

This is an estimate of the average time spent performing this test. The actual o

time spent for each test is unavailable.

1-1

TABLE 1:

DIESEL GENERATOR OUTAGES FOR SURVEILLANCE TESTING (Continued)

Surveillance Test, Section Frequency Date Duration

• Component (s)

Remarks ST-ESF-2,4,13;F.1 Monthly 12/22/76 4 hr.

DGl 1/11/77 Performed to verify operability of safety-related equipment in containment after in-advertent introduction of water into contain-2/28/77 ment spray rings during 3/25/77 routine surveillance 4/21/77 of containment spray pumps.

5/26/77 6/23/77 7/21/77 8/25/77 9/22/77 10/29/77 0

Not Performed-Cold Shut.

11/25/77 0

Not Performed-Cold Shut.

12/22/77 4 tr.

1/26/78 2/23/78 Y

(

3/23/78 Gage was not qualified-3 Calibrated gage-Retest on 3/28 ST-ESF-2; F.1 3/28/78 2 hr.

Retest of ST-ESF-2, F.1 only ST-ESF-2,4,13; Monthly 4/20/78 4 hr.

F.1 5/25/78 6/22/78 7/20/78 8/24/78 y

'l 9/21/78 Y

Y This is an estimate of the average time spent performing this test. The actual o

time spent for each test is unavailable.

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TABLE 1:

DIESEL GENERATOR OUTAGES FOR SURVEILLANCE TESTING (Continued)

Surveillance Test, Section Frequency Date Duration

• Component (s)

Remarks ST-ESF-2,4,13;F.1 Monthly 10/78 0

DG1 Not Performed-Refueling Outage 11/23/78 0

Not Perfonned-Refueling Outage

2/22/78 4 hr.

Performed prior to start-up from refueling outage 1/25/79 2/22/79 3/21/79 4/24/79 5/25/79 6/22/79 7/26/79 8/24/79 9/20/79 10/25/79 11/21/79 I

12/21/79 1/24/80 0

Not Performed-Refueling Outage 2/21/80 Not Performed-Refueling Outage 1

3/20/80 Not Performed-Refueling Outage l

4/24/80 Not Performed-Refueling Outage 5/22/80 V

Not Performed-Refueling Outage 6/26/80 4 hr.

7/24/80 8/21/80 I

V y

9/24/80 w

This is an estimate of the average time spent performing this test.

The actual o

time spent for each test is unavailable.

1-3

l TABLE 1:

DIESEL GENERATOR OUTAGES FOR SURVEILLANCE TESTING (Continued)

Surveillance Test, Section Frequency Date Duration

• Component (s)

Remarks ST-ESF-2,4,13; Monthly 10/23/80 4 hr DG1 F.1 11/20/80 12/26/80 V

V 3,

ST-ESF-2,4,13;F.2 Monthly 1/8/76 4 hr.

DG2 Channel B 2/13/76 h

Safety Injec-tion Actuation, 3/11/76 1 hr.

ST-ESF-4; F.2 only Contain. Spray perfonned during Actuation, and cold shutdown fa 3/23/76 3 hr.

ST-ESF-2,13; F.2 n

g.

Tests performed prior to start-up 4/8/76 4 hr.

5/6/76 6/10/76 7/9/76 ST-ESF-2,13, F.2 only 8/12/76 I

9/9/76 I

10/7/76 0

Not Performed-Cold Shut.

11/8/76 0

Not Performed-Cold Shut.

12/8/76 4 hr.

Performed prior to Start-up from Refueling Outage 1/20/77 2/11/77 3/10/77 4/7/77 5/12/77 6/10/77

'(

(

V 8f 7/7/77 o This is an estimate of the average time spent performing this test. The actual time spent for each test is unavailable.

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m TABLE 1:

DIESEL GENERATOR OUTAGES FOR j

SURVEILLANCE TESTING (Continued)

Surveillance Test, Section Frequency Date Duration

• Component (s)

Remarks ST-E S F-2,4,13 ; F.2 Monthly 8/11/77 4 hr DG2 i

9/8/77 10/29/77 0

Not Performed-Refueling Outage 11/25/77 0

Not Performed-Refueling Outage 12/12/77 4 hr.

1/12/78 2/9/78 3/9/78 4/5/78 5/11/78 6/8/78 7/10/78 i

8/10/78 9/7/78 10/12/78

[

l 11/9/78 0

Not Performed-Refueling I

Outage 12/14/78 0

Not Performed-Refueling Outage 1/11/79 4 hr.

2/8-9/79 24 hr.

Selector switch failed (M0 #21751). Test com-pleted after M0 on 2/9/79 3/14/79 4 hr.

HCV-311 did not open.

Rechecked 4/19/79 5/4/79 6/7/79 l

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7/6/79

'l This is an estimate of the average time spent performing this test. The actual time spent for each test is unavailable.

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TABLE 1:

DIESEL GENERATOR OUTAGES FOR SURVEILLANCE TESTING (Continued)

Surveillance Test, Section Frequency Date Duration

• Component (s)

Remarks ST-ESF-2,4,13;F.2 Monthly 8/13/79 4 hr DG2 9/6/79 10/11/79-11/8/79 12/7/79

(

1/10/80 3

2/7/80 0

Not Performed-Refueling Outage 3/6/80 0

Not Performed-Refueling Outage 4/10/80 0

Not Performed-Refueling Outage 5/8/80 0

Not Performed-Refueling Outage 6/12/80 4 hr.-

7/10/80 8/7/80 9/11/80 10/9/80 11/5/80

(

V i '

12/12/80 i

This is an estimate of the average time spent performing this test.

The actual O

time spent for each test is unavailable.

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Enclosure ! -

TAbil. 2 Plant !!sme fort Calhoun Diesel Generator Scheduled Downtime Record Unit flo.

1 p

Calendar Year 19,_76 Ilours of flount ime Outage neactor shutdown Reactor not shutdown Reason for Outage Date n y- - Ug r'- Ug r T c r T F li{F { ogf oc#

oci 2/23/76 3d,2il Overhaul SM 3/10/76 190.5H Service & Inspection per MP-DG-1 (overhaul) 3/18/76 12.lH Connected 20003 Res. across contacts 3 & 4 of CR-120 relay.

4/27/76 1.6 D-2 Pri. Air St. Motor Didn't Disengage k!plS$$i3iONc!!"kuelline 5/13/76 1.0 5/17/76

3411,

. Change Lube Oil & Filters Per EM Manual 34M Check coupling alignment on soak back filter 5/26/76 7 11,

(Lovejoy coupling spacer replaced),

14M 6/7/76 SM No additional information available 8/15/76

22H, Adjust Speed Switch 30M Pres. Switch for Secondary Air Not Working 8/16/76

_57M Also Solenoid Valve Leaks 9/27/76 No additional information available 10/20/76

12d, 1 111, Overhaul 15M 11/9/26 Calibrate DG-2 Metering

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Enclosure ! -

Taut.E 2 Plant flame Fort Calhoun 1

Diesel Cencrator Scheduled Downtime Record Unit lio.

l Calendar Year 19_77 liniers of Downt ime Outage neactor shistdown neactor not stiutdown Reason for Outage Date

~Dcr 7gP-- Ugr TiCF 7iCF-

'ligT-prji nc#

nct in:t Speed switch improperly set - striking 2/1/77 7H, flywheel 25M

~~

2/22/77 94H Overhaul 4/11/77

70H, Overhaul-Check pitch of fan blades 48M 4/18/77

54H, Remove, clean and inspect secondary air 42M system 5/23/77

27H, Change engine coolant, DG-2 8/26/77 lH, Check and repair leaks on lube oil 18M expansion tank 10/12/77 7H, No additional information available 45M 10/26f77 7H No additional information available 12/9/77 lH Repaired transducer for ampmeter.

4 6

6 m

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TAl!:J. 2 Plant flame Fort Calhoun Dicael cenerator Scheiluleil Downtime Record Unit lio.

1 Ca".cnilar fear 1919 llours of Downtime Outaae neactor shutdown neactor not shotanwn eason for Outage Date

~UyT-~ 7 ]I-~~DgT' UUF

]T-gl~'-

Igl uca Dcl Dcl Remove Thermostatic Valves from Jacket 2/12/79 105H Water TCV, check for proper travel 0 rated temp. Annual overhaul.

3/9/79 lit,

DG-1 fails to start, relays 104 Elx and ~

15M 104 E2X chatter and arc 4/4/79 lH, Lube oil recirc. pump - faulty 30M coupling FCVS Removed, calibrated, replaced 4/23/79 37H 4/30/79 12711.

Overhaul 15M 6/28/79 7H Maintenance to 1AD1 breaker.

11/12/79 133H TCV's for DG-1 cal. and/or replaced.

Annual overhaul.

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ed as 4

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.s-----

Enclosure ! -

TAnl.E 2 Plant usme Fort Calhoun Dicael Cencrator Sclieduled nowntime Record Unit tio.

3 Calendar Year 1980 Ilours of Downtime Outage Reason for Outage Date cact or stintdown Reactor not sim t duun

'DGI~ ~~DgT ~Dyl~ ~n:rmiCY }T~ f ny:1~

oci uct Diesel DI Immersion heated control trans-7/9/80 SH former failed due to unknown causes. Re-placed with GE transformer.

7/16/80

27H, Replaced rusted out portion of exhaust 18M pipe on DG #1 8/11/80 4H, Changing lube oil.

~

50M 8/13/80

33H, Changing lube oil.

6M Immersion heater DG-1 needed replacing.

9/10/80 8H 224 Replaced trans. T-4.

9/24/80

10H, Repair lube oil leak.

23M 9/25/80

27H, Repair lube oil leak.

45M 9/29/80 10H' DG-1; Various alarms on the lube oil and cooling water. Checked circuits - recon-31M nected wires.

10/27/80 1H, Replaced Immersion Heater Contactor on DG-1.

48M Damaged by Transformer failure on 7/9/80 11/5/80 3H DG-1 failed to start upon actuation of chan-nel full speed test switch. All circuitr 4$f.

including wire connections were ch'ecked yOK 11/10/80 88H

"~

30s Overhaul Broken air line from air start solenoid on 11/14/80 2H*

DG-1.

Replaced broken air line.

~ '

I8N DG-1 failed to start on secondary air start 12/11/80 A4 motors. Cleaned air start motors.

24M w

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Enclosure I

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TADI.I. 3 111coc1 Cenerntor Ifonctieduled Ilountime Record l'I n n t finne Fort Calhoun.

Calendar Year 1976, 80 Unit Ito.

1,

~

N, nun uto - 11 any I tiie regi r ed f allmes would not leave been a 1.En Alis t rac t 11.

Downt ime flours fn!!ure under emergency conditions, plenoc cuplain lierc.

(Itcle r t o at tcl

"'I'" E!

'*I*'

E "EE**I'*d I" "'

EI'* I*II"'*'

II'E' I" I#I'I" I*

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ed I.En AI,stract s)Ilours alioo t t eig tvern etc tcplace r

s.

76-16

<24 s4 heeAttachedLERs 78-22.

<24 S

78-24

<24

)

80-14 5

80-30

<24 1

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TABLE 4:

ECCS COMPONENT OUTAGE FOR SURVEILLANCE TESTING b

Surveillance ~

Test, Section Frequency Date Duration

• Component (s)

Remarks ST-SI/CS-1, F.1 Quarterly 1/13/76 4 hr.

LCV-383-1/2 Functional HCV-383-3/4 4/14/76 Some high and low Testing of SI-1A/lB readings in alert Safety Injec.

SI-2A/28/

range. Retest on and Contain.

2C - SI-3A/

4/15 Spray Pumps 3B/3C and Valves 4/15/76 Retest gave satis-factory results 10/14/76 0

Not Performed-Refueling Outage 1/12/77 4 hr.

HPSI SI-2A discharge valve did not open with control room switch.

Operator opened manually (repaired under M0 #13265).

3/24/77 4 hr.

Test run to check oper-ability of Containment Spray Pue.9s to satisfy interim Tech. Spec. 6.6 4/12/77 4 hr.

7/13/77 s/

10/77 0

Not Performed-Refueling Outage l

1/78 4 hr.

4/12/78 7/12/78 V

10/78 0

Not Performed-Refueling Outage 1/17/79 4 hr.

4/20/79 y

7/26/79 3 r 9

V This is an estimate of the average time spent performing this test.

The actual o

time spent for each test is unavailable.

I 2-1

0-TABLE 4:

ECCS COMPONENT OUTAGE FOR SURVEILLANCE TESTING (Continued)

Surveillance Test, Section Frequency Date Duration

• Component (s)

Remarks ST-SI/CS-1, F.1 Monthly 9/11/79 4 hr.

LCV-383-1/2 HCV-383-3/4 10/16/79 SI-1A/1B

-2A 11/19/79 LCV-383-l has a packing A/

leak. HCV-2908 won't 3B/3C close (M0 #2804).

12/15/79 1/18/80 d

2/12/80 0

Not Performed-Refueling Outage 3/11/80 Not Performed-Refueling Outage 4/15/80 Not Performed-Refueling Outage

$(

Not Perfonned-Refueling 5/13/80 Outage 6/17/80 3 hr.

SI-2B not tested due to MO on HCV-2908.

SI-2B tested satisfactorily on 8/12/80.

y 7/15/80 4 hr.

HCV-2908 would' not close (M0 #6231) l 8/11/80 1 hr.

Retest of SI-3C only from 7/15/80 i

(

Monthly 8/12/80 4 hr.

I 9/16/80 3 hr.

SI-2C was not tested because HCV-2918 would not close (M0 # 7687) y 10/14/80 4 hr.

y SI-1B vibration in y

alert.

l oThis is an estimate of the average time spent performing this test. The actual time spent for each test is unavailable.

i 2-2 L-_,

TABLE 4:

ECCS COMPONENT OUTAGE FOR SURVEILLANCE TESTING (Continued)

Surveillance Test, Section Frequency Date Duration

• Component (s)

Remarks ST-SI/CS-1, F.1 10/28/80 1 hr.

LCV-333-1/2 SI-1B retested. Still HCV-383-3/4 in alert range.

Monthly 11/8/80 4 hr.

SI-1A/lB Sf-2A28 Excessive vibration.

11/18/80 4 hr.

p required action range 3B/3C 3

11/21/80 1 hr.

4 Realigned bearing. Re-r tested pump This is an estimate of the average time. spent performing this test. The actual o

time spent for each test is unavailable.

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f 2-3

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F LICENSEE EVEffT REPORTS l

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LICENSEE EVENT REPORT 50-285/76-16 COffTnOL ULOCK:l l

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l (ptrAUC PntNT ALL DCTUIRED INFoHMATION 1

U tctNStf tctNst EviNT NAM (

LCENSE NUMBER l nlE lF l Cl Sl ll l0 l0 l-l 0 l 0 l 0l 0l 0l-l0 l 0 l l 4 l 1 l1 l1l1l

[0[3]

TYPE TYPE UD 14 lb 2b 2G 30 31 32 Tv$ sYu N cAf tC04Y OOCKET NuMotn tytNT OATg ntPOnT DATE Ecen l 1

l Ltd IL_J 101510 I-10 l e i 81 si l0lh121717l61 10 is 11 il 17 i 6 7 0 b7 50 59 GO G1 68 09 74 7b UC EVENT DESCRIPTION a? lAt 1616 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.14888e-4 months <br /> on April 27, 1976', the primary air start motor for DG-2 failed to dis-l 7 89 l engage after DG-2 was successfully started and at 100 RPM.

Oc o

The redundant diesel l

7 H9 l generator, DG-1, was started and run to prove operability; both redundant offsite 00 04 l

7 Uu

@ l power sources, the 161 KV and the 345 KV vere also operable.

(LER 50-285/76-16) l 7 H9 bl 7 U9 l

,,.M r tysit u CAUSE 80 rmurONENT COMPONE NT CODE CODE COMPONENT CODE SUF'PLE R M ANUFACT UFE R VOLATION

@ lElEl W l I l N l Sl Tl Rl u l W

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[N j 7 00 10 11 12 17 43 44 47 40_

CAUSE DESCO PTION

@ l The airgan setting for the magnetic pickup unit for the airpax electronics switching l h l tachemeter was not set correctly.

80 l

7 09 l

1O

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f *Ca riv METHOD OF LIAIUS

% POWEA OTHin ST ATUS OtGCOVERY OiSCOVERY OESCA:PTON Q

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NA l

(Bj 7 8 9

10 12 13 44 45_

l Maintenance Test l

46 80 ACT fVTT Y COdifNT HELEASED OF ACLE ASE LzJ LzJ l n^ AMOUNT OF ACINITY l

I "^

l LOCATON OF RELEhSE 2a 7 U 9

10 11 44 4S PERSONNEL EXPOSURES 80 NUMOI A TYPE DESCA4PTON

$ 1010101 L zJ l

n^

l 7 89 11 12 13 60 PERSONNEL INJURrES NUMDf R DE SCRIPTON l0 l0 l 0l l NA i

14 l

1 09 11 12 80 OrrSITE CONSEQUENCES

@ l n^

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1 00 LOSS OR OAMAGE TO FACILITY 00 TYPE Ot SCHIP T ON g][zj l NA l

U9 10 80 PUBLICITY IIBINA l

U9 00 l

ADO:TIONAL FACTORS

] l See Attachments 1, 2 and 3 U9 l

00 TE I 09 l

Uo NAME:- John M. Nagl h02 h26 h011 PHONr.

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Licensee Event Report 50-285/76-16 i

Page Two-Attachment No. 1 t

i Cafety Analysis Even though DG-2 did properly start at 1616 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.14888e-4 months <br /> on April 27, 1976, it was administratively deemed inoperable since the primary air start motor failed to disengage at 100 rpm. At 1620 hours0.0188 days <br />0.45 hours <br />0.00268 weeks <br />6.1641e-4 months <br /> DG-1 was started and run to demonstrate operability. While DG-2 was inoperable off-site 161 KV power was operable and supplying engineered safeguards buses 1A3 and 1A4 with off-site 345 KV power available to buses 1A3 and 1A4 should the 161 KV supply fail.

In addition, DG-1 would have supplied bus 1A3 (DG-2 feeds bus 1A4) had all off-site power been lost. There were no inoperable engineered safe-i guards components associated with bus lA3 while DG-2 was inoperable. All requirements of technical specification 2.7.(2)i vere satisfied, plant safety was not, jeopardized and no limiting condition for operation was violated with DG-2 inoperable.

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1 Licensee Event Report 50-285/76-16

• Page Th/ce Attachment No. 2 Corrective Action The magnetic sensing unit for the switching tachometer (speed switch) had been removed on April 27, 1976, so that routine maintenance could be per-formed on DG-2 air start motors. This sensing unit is in close proximity to the air start motors and interferes with accessability for air start motor maintenance.

After completing maintenance on the air start motors, DG-2 was started to prove operability. This start was called for by pro-cedure. After sensing 100 rpm the speed switch generates a permissive signal to disengage the air start motors. However, due to the improper air gap setting, the speed switch failed to generate this permissive and the air start motors consequently did not disengage. The air gap for the magnetic pick up unit was properly set and DG-2 successfully started with proper disengagement of the air start motors at 1710 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.50655e-4 months <br /> on April 27, 1976 (see Maintenance Order No. 10918). The error was procedural in that the maintenance proccoure did not call for checking the air gap setting whenever the speed sensing unit is re-installed. Hereafter this setting vill be checked.

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1 Licencee Event Report 50-255/76--16 l

• Page Four Attachment No. 3 t

Failure Data-i This is the first occurrence of an improper air gap setting for the speed sensing unit for a diesel generator at the Fort Calhoun Station Unit No. 1.

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1 l

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7 ILICENSEE EVENT REPORT CONVROL BLOCd: l l l

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l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI i

e T l l U l z l P l c I s l l l@150 lo 10 l 0 lo l01010 l01010 l@l4 l1 l1 13 l, l@l l

lg 3 9 LICENSEE CODE 14 LICENSE NUM8EH 25 26 LICENSE TYPE Jo 57 CAT $8 WT E

%,"c[ l L )@l 0 l 5 l 0 l 0 ! O l 2 l 815 l@l 0 l 7 l1 12 17 18 l@ l0 17 11 lo l r la l@

60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE do EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h g lDuring the monthly load test of diesel generator number 1 the generator field vent to 1 7 q ; maximum excitation and was shutdown to prevent generator damage.

Three problem areas l p l vere discovered:

the field boost relay had drifted, the reference P.T. stab was looseI

., ) gand the regulator reference zener was found defective.

The items were repaired and I

g j lthe diesel retested and returned to service.

I

~iT) l I

80 SYSTEM CAUSE CAUSE COMP.

VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUSCODE y

lE lE l@ Q@ J@ l Gl El Nl El Rl Al@ W@ y @

s 9

10 18 12 13 18 19 20 SEQUE NTI AL OCCURRENCE REPORT REVISION LE R RO EVENT YEAR REPORT rJO.

CODE TYPE N O.

@ suNE l 7l 8l l-l l 0l 2l 2l y

l0 l3 l l Ll l-l lo l t a7

_ 21 22 23 24 28 27 28 29 30 31 J2 Ta N ACT ON ON PL NT MET HOURS S8 1T FOR 8.

SUPPLIE MANUFACT RER lA j@l Zl@

lZ l@

U@

l0l0l0l0l W@

lUl@

lAl@

l G l 0 l 8 l 0 l@

JJ Je 35 36 37 40 41 42 43 44 47 CAUSE CESCRIPTION AND CORRECTIVE ACTIONS j, ; lThe field boost relay was found to have drifted, the reference P.T. stabs vere leese I

, j land the reference tener diode for the generator regulator was found defactive.

I

,,, gite=s were repaired.

This is the first failure of this tyne and no further action is 1 y l anticipated. The tener diode was felt to be the failure mechanism.

I TTl l I

s >

80 h

ESEOSRY

' *C TS STA sPOwER OTHER STATUS DISCOVERY DESCRIPTION y [E l@ l 0 l 9 l 8 l@l NA l

lBl@l Surveillance Test l

Ai'miTY CaTENT RELE ASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE le 1 1: l @ LEJ@l NA l

l NA l

s 3 to 11 44 45 80 I

PERSONNEL EXPOSURES t

NUV8ER TYPE DESCRIPTION j

id 1010 lo l@[lj@l NA l

l

,ERSONNELINJJiES NUM8ER DESCRIPTION l

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LER 78-022 Cmaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 Attachment No.1 Safety Analysis i

2 The Fort Calhoun Station electrical distribution system is so designed that no single failure can prevent the safe shutdown cf the plant if required.

During the time that diesel generator number 1 was inoperable, diesel generator number 2, the 161 K7 supply, and the 345 KV supply were available.

The initial failure (generator overexcitation) occurred on July 12, 1978.

At this time an investigation was initiated in an attempt to discover the failure

=echanism. The investigation showed that the current boost which actuated on low generator tenminal voltage had drifted up.

This drift upward coupled with a low

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grid voltage due to summer load on the 161 KV grid was felt to be the failure

=echanism, since the generator goes to maximum excitation on actuation of the relay. The relay was reset and the diesel was load and run for approximately 1

20 minutes on July 13,1978 (this short load time was due to an electrical storm at the station which could potentially damage the diesel while synchrcnized to the bus).

The diesel was considered operable at this time.

On July 14, 1978, the monthly surveillance test was repeated on diesel generator number 1 to completely verify operability. At approximately 55

=inutes into the test the generator again went to maximum excitation and was subsequently tripped. Upon further investigation, two problem areas were identified.

The generator terminal reference potential transformer plug in stabs were found to be loose, which may have caused the overexcitation, and the reference voltage sener diode in the generator voltage regulator was found to be defective, which could have caused the failure. The stabs were repaired and the ener was replaced with a 10W 2hV sener diode (the original equipment

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zener diode is no longer available). General Electric was consulted on the change to an ECG5198 diode and concurred with the replacement diode.

The voltage stability of the generator was then reset and recovery time was tested snd set at less than 1 second at no load.

Per telecon with General Electric l

on July 1h,1978, the worst case recovery is at no load.

The diesel was then retested and found to be operable on July lh, 1978, by surveillance test ST-ESF-6.

This is considered to be an isolated failure and no further action is anticipated.

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4 IIR 78-022 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 Attachment No. 2 Failure Data This is the first failure of this type at the Fort Calhoun Station Unit No.1.

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d 60 61 COCK ET NUMB E R ba 69 EVENT DATE 72 75 REPORT O ATE 40 EVENT DESCA1PTION AND PACS A9LE CONSECUENCES h g lOuring the Onthly load test of Diesel Generater No.1 the field vent to =axi== exci_ :

g ;tatien and was shut devn to prevent generator damage.

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ener diode drift and probable bus conditions ccupied with a pcsitiva li

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"he diode vas replaced and the generator current restricted l T"i-] l for 1:ad tests when paralleled to the bus.

The generater was retested successfully.

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j' LIR 73 s02k Cnaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTACEENT NO.1 Safety Analysis The Fort Calhoun Station Unit No. 1 Engineered Safety Features Systa=

is so designed that no single failure can prevent the safe shutdown of the plant if required.

During the ti=e Diesel Generator No. I was inoperable (during repair and testing), Diesel Generator No. 2 was operable and both the 161 K7 and 3k5 KV supplies were available.

During the period of trouble shooting and testing on August 9,1978, with the exciter =anufacturer and subsequent testing on' August 30,.1c78, as recc== ended by the exciter manufacturer, the following infor:stion was discovered:

(1) During the initial one hour run which lead to the failure of Diesel Generator No.1, it was noted the _ generator cut-put current centinued to increase throughout the entire run vithout any operator action.

(2) A bench test of the reference ener diode shoved continual drift up.

This was the tener which was replaced and reported in LER 78-022.

The drift was within =anufacturer tolerance.

The original diode was ther= ally ec=pensated and exhibited a smaller drift, hcvever, this exact replace-

=ent is no longer =anufactured.

(3) At the time the failure occurred, the generator exciter was approx *-ately at its naxi=u= long time exitation limit, which was approaching the saturation limits of the machine.

(h) The generator droXp cc=pensation is vired to boost current if generator current increases, rather than a nor=al machine set up for parallel operation on a bus, in which the droop ccmpensation tends to limit current.

Eased on the data and information collected during testing and trouble-shcoting Diesel Generator No. 1, the following hardware and procedure changes vere instituted:

(1) The :ener diode referenced earlier was changed ou: to a 5CW

ener diode to provide greater stability.

The subsequent test shoved the diode did drift but to a =uch s=a er extent than the 10W :ener.

(2) The generator exciter circuit was designed to provide maxi-

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• boost in starting the Ingineered Safety Features Leads.

As a result of this, when paralleled to the bus, the

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LER TS-02h C=aha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTAC* E T NO. 1 (continued) r drcop CT influence on the regulator operation may not be able to be ec=pensated for by a change in ter=inal voltage on the =achine (parallel operation vill result in small terminal voltage changes with excitation and large current changes or power facter changes).

To li=it current output of the generator,ad=inistrative centrols have been placed on the machine during parallel operation to li=it the current to belov 400 a=ps at 2500 l

KW (which is away frc= the saturation region of the nachine).

A cc=puter alar = for the generator has also been provided to alar = at h00 a=ps.

l In discussing this proble= with the exciter =anufacturer and based on the test data.it has been deter =ined than though the generator failed when paralleled to the bus, at no ti=e was it inoperable, if required, to perfc== its design function for Engineered Safety Feature creration.

When the generater is operated carrying the ES? loads, after the initial lead starting, it vill provide only the current required to =aintain the lead.

Any shift of the exciter circuit vill result in a drift of ter-

=inal voltage and a small drift (aV/Z) of ' current, negating the droop cc=pensatica effect.

l The failure during parallel operation was deter =ined to result frc=

two areas; the drift of the ener diode and a s=all load change on the bus during the generater test.

The ener diode drift and bus condition resulted in the generator being at approximately the =axi=un long time excitation li=its. Any s=all voltage decrease or lead increase On-the l

bus at this time vould have required more current out of the generator, l

resulting in the drcop circuit positive feedback, increasing excitation with little er no negative feedback frc= the exciter's voltage input.

At this time the machine vent to maxi =u= excitation and blev the field protection fuses.

The generator was subsequently retested and the current was 1L=ited belev h00 a=ps.

No proble=s were encountered and no further action is anticipated.

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LIa 78;02h C=aha Public Power District Fort Calhoun Station Unit No. 1 Oceke :To. 05000265 A"'TACBE:IT !!O. 2 Fail e e Data A previcus failure was reported on LER 78-022.

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F 6J 61 DOCKET NUM8ER 68 6il EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CCNSEQUENCES h 2l Transformer (T4) of DG-1 failed.

This transformer fed oower to the diesel's nil uI Z, !

mersion heater as well as alarm circuitry corresoondina to the followina items:

I Il Low lube oil pressure. Low lube oil level, and Hiah or low lube oil temoerature.

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]I During the time of the transformer (T4) failure, DG-2 as well as the 161KV and 345 KY gI systems were available and operable and would have been more than caoable of niti-1 lI catina. the circumstances of an accident should. the need arise.

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was considered inoperable only during the time that the transformer was being

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1, changed out, i.e. only while DG-1 was in " local maintenance" s:

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The transformer failure was caused by a shorted coil.

The transformer was reclaced I witn an equivalent component and subsequently the diesel generator, immersion neater gi and all transformer related annunciation circuitry was satisfactorily tested and l

returned to operation. The replacement transformer although eletrically eouivalent I l

g; was of a different manufacturer. Thus an exact replacement transformer or the transi gl

or.w r unich nas supercedeo it wili be procurreo and installed as soon as time g[

permits.

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P LER 80-014 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT N0. 1 Safety Analysis The Fort Calhoun Station Unit No.1 Engineered Safety Features System is so designed that no single failure can prevent the safe shut-down of the plant if necessary.

During the time diesel generator DG-1 was inoperable, diesel generator DG-2 was operable as were the 161 KV and 345 KV supplies thus providing more than adequate capability for safe shutdown of the plant should the unlikely event of an accident occur.

It should be pointed out that DG-1 was considered inoperable only during the time that the transformer was being changed out since this transformer only feeds the oil immersion heater for DG-1 and associated annunciation.

Should the need have arisen, DG-1 would still have automatically started per engineered safeguards and performed its design function as described in the Final Safety Analysis Report.

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a LER No.80-014 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT NO. 2 Corrective Action M.0. #6421 was written to replace the failed Westinghouse 480/120, 100 Va, Model 2-F-47-1 transformer.

Since Westinghouse no longer manu-factures this transformer, (it was superseded by their model 1F0892) and no exact duplicate / spare was available, it was replaced using an equivalent GE 100 Va, 480/120 volt transformer.

Upon replacement, the diesel was tested satisfactorily for operation as was all transformer related circuitry and the diesel DG-1 was returned to service.

As a further note, the Westinghouse model 1F0892 transformer which has superseded the failed model 2-F-47-1, and is electrically equivalent or superior to the model 2-F-47-1 has been ordered and will be installed in DG-1 circuitry as soon as procurement allows.

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LER No.80-014 Omaha Public Power District Fort Calhoun Station Unit No.1 l

Docket No. 05000285 i

f ATTACHMENT NO. 3 i

i Failure Data This is the first failure of this type at the Fort Calhoun Station.

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTtoN AND PROBABLE CONSEQUENCES h

]l During the performance of ST-ESF-6, F.2, Appendix F, Diesel Generator #1 (DG-1)

I gl failed 'to start on its secondary air system. DG-1 was removed from service in I

gl accordance with Tech. Spec. 2.7(2)i and the secondary air start motors were re-I gl paired.

Prior to the incident, DG-1 had successfully started on its primary air I

gI s tart syste'a.

In addition, DG-2 was started to verify its operability.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE oESCRIPTION AND CORRECTIVE ACTIONS gi The vanes of the air motors were stuck which prevented the motors from turnino. Thei gI vanes were cleaned, the motors were installed and DG-1 was successfully started on J gl its secondary air start system.

To prevent future simil ar events, the air start I

gl motors and the air line strainers will' be inspected and cleaned annually per I

gi surveillance test ST-ESF-6.

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J LER No.80-030 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT N0. 1 Safety Analysis Fort Calhoun Station Unit No.1 is designed such that a single failure cannot adversely affect the ability of the plant to be safely shutdown in the event of an accident.

Although DG-1 failed to start on its secondary air start system, it had previously successfully started on its primary air system.

In addition, DG-2 and both redundant offsite power supplies (161 KV and 345 KV) were available during the time that DG-1 failed to start on its secondary air system.

M LER No.80-030 Omaha Public Power District Fort Calhoun Station Unit No. I Docket No. 05000285 l

l ATTACHMENT NO. 2 Corrective Action l

M.0. #8169 was initiated to repair the secondary air start motors of DG-1.

An inspection of the motors revealed that the vanes were stuck which prevented the motors from turning.

The primary and secondary air start systems will be tested periodically per ST-ESF-6.

In addition, the primary and secondary air start motors and the air line strainers on t

the primary and secondary aid start systems will be inspected and cleaned annually per ST-ESF-6.

The air line lubricators on the primary and secondary air start systems will also be inspected annually and, if i

l necessary, they will be cleaned.

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LER No.80-030 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT N0. 3 Failure Data Previous related incidents are detailed in Unusual Event 73-5, Ab-normal Occurrence 75-20 and LER 77-12.

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