05000331/LER-1980-012-01, Standby Diesel Generator 1G-31 Lower Crankshaft Thrust Bearing 13 Was Found Wiped on Journal Surface.Caused by Bearing/Crankshaft Clearance Out of Spec & Low Oil Sump Level.Sump Filled.Bearing Replaced
| ML112410935 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 04/24/1981 |
| From: | Rager M IES Utilities, (Formerly Iowa Electric Light & Power Co) |
| To: | NRC/OI/RGN-III/FO |
| Shared Package | |
| ML112410936 | List: |
| References | |
| LER-80-012-01X, LER-80-12-1X, NUDOCS 8104300323 | |
| Download: ML112410935 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| 3311980012R01 - NRC Website | |
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REGULATO INFORMATION DISTRIBUTION *TEM (RIDS)
ACCESSION NBR:8104300323 DOC.DATE: 81/04/24 NOTARIZED: NO DOCKET #
FACILt:50-331 Duane Arnold Energy Center, Iowa Electric Light & Pow 05000331 AUTH.NAME AUTHOR AFFILIATION RAGERM.S.
Iowa Electric Light & Power Coo RECIP.NAMEi RECIPIENT AFFILIATION Region 3, Chicago, Office of the Director SUBJECT: Updated LER 80-012/01X-j:on 800317,standby diesel generator IG-31 lower crankshaft thrust bearing 13 was found wiped on journal surfaceCaused by bearing/crankshaft clearance out of spec & low oil sump level.Sump filled.Bearing replaced.
DISTRIBUTION CODE: A002S TITLE: Incident Reports COPIES RECEIVED:LTR ENCL SIZE:I 2.,
NOTES:
RECIPIENT ID CODE/NAMEi ACTION:
IPPOLITOT, 04 INTERNAL: A/D COMP&STRU06 A/D MATL & QU08 A/D PLANT SYS1o A/D SFTY ASSE12, AEOD ASLBP/J.HARD CHEM ENG BR 16 CORE PERF BR 18 DIRHUM FAC 821.
EFF TR SYS BR23 GEOSCIENCES 26 I&E 051 LIC GUID BR
- 30.
MECH ENG BR 33 OR ASSESS BR 35, R
AS BR39 F27I LE 01 GEVA42' COPIES LTTR ENCL 3
3 RECIPIENT ID CODE/NAME, A/D ENV TECH 07 A/D OP REACT009 A/D RAD PROT 11 ACC EVAL BR 14 AEOD/DMU AUX SYS BR 15, CONT SYS BR 17 DIRENGINEERI20 DIRSYS INTEG22 EQUIP QUAL BR25 I&C SYS BR 29 JORDANE./IE MATL ENG BR 32; NRC PDR 02 POWER SYS BR 36' REACT SYS BR 40 REL & RISK A 41 STRUCT ENG BR44 COPIES LTTR ENCL 1
1 1
1 1f 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
3 1
1 1
1 1
1 1
1 1
1 1
1 EXTERNAL: ACRS NSIC TOTAL NUMBER OF COPIES REQUIRED: LTTR 46 05, 16 16 1
1 LPDR 03k 1
1 "Mq118
,~O 61 ENCL 61
Iowa Electric Light and Power Company April 24, 1981 DAEC-81-262 Mr. James G. Keppler, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission -
Region III 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Licensee Event Report No.80-012 UPDATE REPORT:
(14 day)
Previous Report Date 3-31-80 File:
A-118a
Dear Mr. Keppler:
In accordance.with Appendix A to Operating License DPR-49, Technical Specifications and Bases for Duane Arnold Energy Center and Regulatory Guide 10.1, please find attached.a copy of the subject Licensee Event Report.
(Total of 3 copies transmitted).
Very truly yours, Daniel L. Mineck Chief Engineer Duane Arnold Energy Center Docket 50-331 attachment DLM/'MSR/pl cc:
Director, Office of Inspection and Enforcement (40)
U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Director, Management Information and Program Control (3)
U. S. Nuclear Regulatory Commission Washington, D. C.
20555 U. S. Nuclear Regulatory Commission c/o Document Management Branch Washington, D. C.
20555 NRC Resident Inspector -
DAEC unne Arnoid Energv Center
- PO. BoN: 351
- Cedar Rapids, Iowa 52406
- 319/851-5611
NRC FORM 38 NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT
- DATE REPORT:
Previous Report Date 3-31-80 1CONTROL 81.CK:
(PLEASE PRINT 0R TYPi ALL REQUIRED INFORMATION) 1 6
[
I 1lAID A IC 11 2 01 01 -1 0101 0 Q 101-101 q )j 4 111 1 111110 7
8 9
LICENSEE CODE 14 is UCENSE NUMBER 2S 26 UCENSE TYPE O
57 T 58 CONT REPORT 15 (0 10 1010313 l
1311 17181 1i0141 21 41 RA 1li SOURCE
_0 0_J~
7 S
60 61 DOCKET NUMBER 48 69 EVENT DATE 74 7S REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES 0
I During the annual inspection of standby diesel gen. 1G-31, the lower 03 crankshaft thrust #13 bearing was found wiped on the journal surface.
04 I Further investigation revealed bearing/crankshaft clearance out of spec.
F77 I and low lube oil sump level. Level was maintained in accordance with 0 T"I vendor manual. Redundant standby diesel 1G-21 annual inspection reveal 07
? ed similar problems (See RO 80-011). Diesel aenerator operability requir 1
8T I ements are given in T.S.3.8.A.2. See also RO Reports 77-32 and 78-020, I
7 89 80 SYSTEM
CAUSE
CAUSE COMP.
VALVE CODE CODE SUscOO0 COMPONENT COOS SUBCODE SUSCO0E 0]
El El I,_XJ I
L 1,E1 NI G1 II NI El LLJ IZ 7
8 9
10 It 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION G
LER/RO EVENTYEAR REPORT NO.
coDE TYPe NO.
REPORT 1_J
--j 1 01 11 21 1
0, 11 [X 1 1 _1 NUMBER L21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRO.4 PRIME Como.
COMPONENT TAKEN ACTION ON PLANT METHOO mouRS SUBMITTED FORM bus.
SUPPLIER MANUFACUER 36 j
1J N@
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1C41 71 0 L LO.. J 1..0@
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33 34 35 36 37 40 41 4
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. 43 4447 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 I Vendor study revealed bearina/crankshaft clearance was out of spec. Vend TI I or analysis resulted in installation of bearings to provide mid-range lo J
[T I wer crankshaft end float. Lube oil sump was filled: dipstick mark revise 3Ti i d per vendor recommendations. Crankshaft was relaDped and Gen. was test-1 14 I pd sat. Additional invest.. reqd due to problems found during 1981 refuel.
I so FACILITY METHOD OF STATUS
% POWER OTHER STATUS ISCOVERY DISCOVERY DESCRIPTION 15 0 1 0 1
.0 JI1 NA I 1IB Annual Surveillance Test 7
8 9
10 12 13 4
45 46 80 ACTIVtTY CONTENT 12 1
RELEASED *OF RELEASE AMOUNT OF ACTIVITY LOCATION OF AeLE 1
L.zi@.zJl NA I
NA 7
a 9
TO I1 4
5 80 PERSONNEL EXPOSURES NUMBER TYPE
DESCRIPTION
I I1 01 01 0o1 z ICI 7
8 9 11 12 13 80 PERSONNEL INJURIES NUMBER OESCRIPTION 1 01 Q lI NA 7
8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE 0ESCRIPTION T
Wl1 1 NA 7
8 9 10 80 PUBLICITY NCUEOL ISSUED
DESCRIPTION
NRC USE ONLY NL.i@
NA 11111111111l I 7
8 9
10 68 69
- 80.
NAME OF PREPARER Matthew S.
Rager P
.ONE: 319-851-5611
)UANE ARNOLD ENERGY CENTER Iowa Electric Light and Power Company LICENSEE EVENT REPORT-Supplemental Data Docket No. 050-0331 Licensee Event Update Report: April 24, 1981 Reportable Occurrence No:
80-012 UPDATE REPORT:
Previous Report Date 3-31-80
Event Description
During the annual inspection of standby diesel generator 1G-31, the lower crank shaft #13 thrust bearing was found wiped on the journal surface. Further investi gation revealed that the lubrication oil sump level was low such that there may have been insufficient lubrication of the #13 thrust bearing. Redundant standby diesel generator 1G-21 annual inspection revealed similar problems (See RO Report 80-011). Although both diesel generators were operable at the time of the surveil lance testing, extended operation, without corrective action, could have resulted in the bearing failure. Standby diesel generator operability requirements are listed in Technical Specification 3.8.A.2. There have been two similar RO Reports previously submitted (See RO 77-32 and 78-20). This unit is a Fairbanks Morse Model 3800 TD8-1/8.
Cause Description Vendor representative indicated the diesel #13 thrust bearing to crankshaft clearance was found out of specification (too small). Vendor analysis recommended the instal lation of bearings to provide for mid-range lower crankshaft end float. The engine lube oil sump level was maintained in accordance with the manufacturer's technical manual.
However,.the vendor representative indicated that the level was incorrect.
The "full" mark on the sump dipstick was relabelled."running full" and a new higher "shutdown" full level mark was added to the stick to preclude improper sump fill in the future. Although insufficient lubrication may or may not have contributed to this event, lack of lubrication could have eventually caused bearing failure.
Corrective Action
The diesel thrust bearing'was replaced with a factory modified bearing to provide the recommended clearance. The diesel generator was reassembled and retested satis factorily.
The lubrication oil sump dipstick was marked to indicate a full level position with the unit shutdown in addition to the full level position when in the operating mode.
This relabelling of the dipstick should eliminate improper sump filling in the future.
Oil was added to fill the sump-to the proper level.
The appropriate operating procedure has been revised to reflect the new dipstick markings.
Additional engineering investigation work is planned since a similar wiped bearing problem was discovered while performing the annual inspection of standby diesel generator 1G-31 during the 1981 refueling outage.
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