05000331/LER-1980-011-01, Lower Crankshaft Main Thrust Bearing Found Wiped on Thrust & Journal Surfaces During Annual Insp of Standby Diesel Generator 1G-21.Caused by Startups W/Low Oil in Lube Oil Sump.Bearing Replaced
| ML112410933 | |
| 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 | |
| ML112410934 | List: |
| References | |
| LER-80-011-01X, LER-80-11-1X, NUDOCS 8104300288 | |
| Download: ML112410933 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| 3311980011R01 - NRC Website | |
text
REGULATORNFORMATION DISTRIBUTION *TEM (RIDS)
ACCESSION NBR:8104300288 DOCDATE: 81/04/24 NOTARIZED: NO FACIL:50-331 Duane Arnold Energy Center, Iowa Electric Light & Pow AUTHNAME AUTHOR AFFILIATION RAGERM.S.
Iowa Electric.Light & Power Co.
RECIPNAME; RECIPIENT AFFILIATION Region 3, Chicago, Office of the Director
SUBJECT:
DOCKET #
05000331 Updated LER 80-011/O1X-lon 800317,lower crankshaft main thrust bearingfound wiped on thrust & journal surfaces during annval insp of standby diesel generator 1G-21,Coused by startups w/low oil in lube oil sump.Bearing replaced.
DISTRIBUTION CODE: A0028 TITLE: Incident Reports COPIES RECEIVED:LTR L-ENCL 1 SIZE:
NOTES:
RECIPIENT ID CODE/NAME:
ACTION:
IPPOLITOT. 04 INTERNAL: A/D COMP&STRU06 A/D MATL & QU08 A/D PLANT SYS1O AID SFTY ASSE12 AEOD ASL8P/Ji.HARD CHEM ENG BR 16 CORE PERF BR 18 DIRHUM FAC $21f EFF TR SYS BR23 GEOSCIENCES 26b I&E
- 05.
LIC GUID BR 30, MECH ENG BR 33; OR ASSESS BR 351 RAD BR39 FILE 014
.05 COPIES LTTR ENCL 3
3 1
1 1
1
.3 1
1 1
1 1
1 1
1 1
1 1
1 1
16b 1
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 16 1
LPDR 03, COPIES LTTR ENCL 1
1 1
1 3
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 MAY 0 1 iggy TOTAL NUMBER OF COPIES REQUIRED: LTTR 61 ENCL 61
0 0
Iowa Electric Light and Power Company April 24, 1981 DAEC-81-261 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.80-011 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 APR 2 0 met Dunne Arnoid Energy Center
- PO. BoN: 351
- Cedar Rapids, Iowa 52406
- 319/851-5611
NRC FORM 368 U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT DATE REPORT:
reyious Report Date 3-31-80 CONTROL BLOCK:
(PLEASE PRINT OR TY ALL REQUIRED INFORMATION) 1 6
I1A 0D JA IC 11 I OLo -1ol0o 0o lo.01 -ooJ (1111111110 7
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LICENSEE CODE 14 is LICENSE NUMBER 25 26 LICENSE !YPE J0 57 S
CON'T RE]OuT L__01_o15 10 10 1o0 3 1 3 1 1
0 o3 1l1 1
8 1 U8 60, 61 DOCKET NUMBER 68 69 EVENT DATE 74 -
7 EPORT DATE s0 EVENT DESCRIPTION AND PROSABLE CONSEQUENCES 02 I During the annual inspection of standhy dipsPl gpnpra;tor 10 the lw I
=3 (er crankshaft main thrust bearing was found wiped on both the thrust and 04T I
.ournal surfaces. Investigation revealed that the lube oil level was low.
I (T
I Level was maintained in accordance with vendor manual. Redundant standby ITG I diesel 1G-31 inspection revealed similar prohlems (Se Rn W0-0123)
Dipeq 0
I1 generator operahility requirements are given in T.S. 1-9-A2. Two simi Tl I lar RO Reports have been previously subimitted (RO 77-312 and 7R-20)I 7
8 9 80 SYSTEM
CAUSE
CAUSE COMP.I VALVE CODE CODE SUSCOCE COMPONENT COO SU8CoC0 SUICO0 II IF..10 LLW O
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FI NI z1l NI 03: UUS UU 7
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10 1t 12 13 18 19 20 SEQUeNTIAL OCCURRENCE REPORT REVISION LER/RO EVENT YEAR REPORT NO.
co0 TYPE NO.
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Ld*J l.1.1 Li Li-LlJ R 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTOOWN ATTACHMENT NPRO-4 PRIME COMP.
COMPONENT TAKEN ACTION ON PLANT METHOO NOURS 22 SUBMITTED FORM WU8.
SUPPLIER
- - MANUFACTURER LAJ@LxJ@3 L.LJ@
U e Ian in 10 n I 10@
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33 34 35 38 37 40 4t 42 43 4447 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS To I
Vendor Rep. indicated bearing had not failed and bearing clearances were I within spec. Vendor analysis found that start-ups with insufficient oil Iin lube oil sump resulted in bearing surfaces being wiped, Dipstick mark I
3 ings changed to Prevent recurrence, Bearing replaced. crankshaft relappe I
i 1i d. gen tested sat. New invest, read due to problems found in 81 refuel.
8 80 FACILITY METHOD OF STATUS
%POWER OTMGR STATUS DISCOVERY DISCOVERY DESCRIPTION 15 L.ij lololol NA Li.jIR Annual Surveillance Test 7
8 9
10 12 13 44 45 46 so ACTIVITY CONTENT 12 3
RELEASE OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE EI 1L.zJ @ Lz.171 NA I
NA 7
8 9
ID it 44 46 ao PERSONNEL EXPOSURES NUMSER TYPE
DESCRIPTION
39 l0 l 0 l 0
1 z~
ZIA 7
8 9
11 12 13 80 PERSONNEL INJURIEt NUMBER DESCRIPTION 41 01 O 01 1OI NA 7
8 9 11 12 8g LOSS OF OR DAMAGE TO FACILITY TYPE
DESCRIPTION
19 I z 1I-NA 7
8 9
10 80 PUBLCITY
,'\\NRC USE ONLY ISSUED
DESCRIPTION
7 N
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10 8
69
- 80.
NAME OF PREPARER Matthew S. Rager 319-851-56110 PHON:
31-8515611 a
DUANE ARNOLD ENERGY CENTER Iowa Electric Light and Power Company LICENSEE EVENT REPORT-Supplemental Data Docket No. 050-0331 Licensee Event Update Report Date: April 24, 1981 Reportable Occurrence No:
80-011 UPDATE REPORT: Previous Report Date 3-31-80
Event Description
During the annual inspection of standby diesel generator 1G-21, the lower crank shaft main bearing (#12) was found wiped.and thrust bearing (#13) was found wiped on both the journal and thrust surfaces. Further investigation revealed'that the lube oil sump level was low which likely caused insufficient bearing lubrication.
Redundant standby diesel generator 1G-31 annual inspection revealed similar problems (See RO Report 80-012). Although both diesel generators were operable at the time of the surveillance testing, extended operation, without corrective action, could have resulted in the bearing failure. Standby diesel generator operability require ments 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 3800TD 8-1/8.
Cause Description Vendor representative indicated that the diesel generator bearing had not failed and the bearing clearances were within specifications. A subsequent vendor analysis determined that engine start-ups with insufficient oil in the lube oil sump resulted in both surfaces of the bearing being wiped. The diesel generator lube oil sump level had been maintained in accordance with the manufacturer technical manual. To preclude improper sump fill in the future, the "full" mark on the sump dipstick was relabeled "running" full and a new higher "shutdown" full level mark was added to the dipstick.
Corrective Action
The main (#12) bearing and thrust (#13) bearing were completely replaced, the lower half of #14 bearing was replaced, and the bearing-to-crankshaft clearance was verified to be in accordance with specifications. The #14 bearing was replaced for alignment reasons. The crankshaft was relapped and the diesel generator was reassembled and tested satisfactorily.
The lube oil sump dipstick was relabeled to clarify the "full" sump level.
Oil was added to fill the sump. Operating procedure was changed 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 diesel generator 1G-21 during the 1981 Refueling Outage.
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