ML112900877

LER 79-012/03L-0 on 790702:during Reactor Core Isolation Cooling Sys Test,Governor end-bearing Temp Alarm Received & Bearing Exhibited High Vibration.Sys Inoperative.Caused by Turbine Oil Pump Drive Gear Failure.Gears Replaced

ML112900877
Person / Time
Site:	Monticello
Issue date:	08/01/1979
From:	Hammer S Northern States Power Co
To:	NRC/OI/RGN-III/FO
Shared Package
ML112900878	List: ML112900877 ML19242A875
References
LER-79-012-03L, LER-79-12-3L, NUDOCS 7908060541
Download: ML112900877 (3)

Text

REGULATORY I* RMATION I TPIBUTION SYSTj (RIDS)

ACCESSION NBR:7908060541 DOC,DATE: 0 NOTARIZED; NO DOCKET #

FACIL :*.

50- Cur.m 1 a-v, ' Roeu /7?0Afrre/Lo-O AUTH,NAMEZV3 AUTHOR AFFILIATION an; og HAMMERS.J. Northern States Power Co.

RECIP.NAME RECIPIENT AFFILIATIOi Region 2, Atlanta, Office of the Director

SUBJECT:

LER 79-012/03L-0 on 790702:During reactor core isolation cooling sys testmgovernor end bearing temp alarm received &

bearing exhibited high vibration.Sys inoperativeCaused by turbine oil pump drive qear tailure.Gears replaced.

DISTRTIUTION CODE: A002S COPIES RECEIVED:LTR J ENCL - SIZE:

TITLE: INCIDENT REPORTS NOTES: - - - - - - - - - - -- - ---

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL ACTION: 0 4 14 INTERNAL: REG FILE 1 1 02 NRC PDR 1 09 2 2 11 MPA 3 14 TA/EDO 1 1 15.NOVAK/KNIEL 16 EEL 1 1 17 AD FOR ENGR 1.

18 PLANT SYS BR 1 1 19 I&C SYS BR 1 20 AD PLANT SYS 1 1 21 AD SYS/PROJ 22 REAC SAFT BR 1 1 23 ENGR BR 1 24 KREGER 1 1 25 PWR SYS RR 1 26 AD/SITE ANAL 1 1 27 OPERA LIC BR 1.

28 ACDENT ANLYS 1 1 29 AUX SYS BR 1 E JORDAN/IE 1 1 HANAUER,S. 1 TMI-H STREET 1 1 EXTERNAL: 03 LPDR 1 1 04 NSIC 1 1 29 ACRS 16 16 AUG 8 1979 go TOTAL NUMBER OF COPIES REQUIRED: LTTR 48 ENCL 48

NORTHERN STATES POWER COMPANY MINNEAPOLIS. MINNESOTA 58401 August 1, 1979 REUay F# p Mr J G Keppler Office of Inspection & Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr Keppler:

MONTICELLP ,UEAR GENERATING PLANT Docket No 50-263 License No. DPR-22 RCIC System Inoperability The Licensee Event Report for this occurrence is reproduced on the back of this letter. Enclosed are three copies.

This event is reported in compliance with Technical Specification 6.7.B.2.b in that conditions lead to operation in a degraded mode permitted by a limiting condition for operation (3.5.F.2). The redundant HPCI System was operable at all times during this event.

Yours very truly, O aer, L anager o~f Nuclear Support Services LOM/JAG/jh cc: Director, IE, USNRC (30)

Director, MIPC, USNRC (3)

MPCA Attn: J W Ferman 14,0,OL 79 OOU s

-over-

14,11.14 1%'%11IMAIIIIIST 1A)MMI16161UN LICLNSLL LVI NI HLUlIi CONIIal fil OCK: I LPj ( fCASE I'IIINI Oil IYPE ALL IItOJIIItE I1I INI OItMATION)

[Jjj IMINIMINIP 11 I'lo 10 7 8 9 LICENSEE CODE 14 15 1- lo 10 olo 10o 1- 10lo 101 764 11 11 11 - 401 LICENSE NUMIII 2b , LICENSE TYPE 30 67 CAT 68 CON'T 01 REPOfC [L J 0 1 5 10 l0 10 12 16 13 10 17 10 1217 19 )I 1 810 l 117 19 7 B 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES

[0-~2() I DURING ROUTINE SURVEILLANCE TEST OF THE RCIC SYSTEM, A GOVERNOR END BEARING HIGH l f0i13l I TEMPERATURE ALARM WAS RECEIVED. THIS BEARING ALSO EXHIBITED HIGH VIBRATION. THE I IRCIC SYSTEM WAS DECLARED INOPERATIVE. THE RCIC SYSTEM IS REQUIRED TO BE OPERABLE I IPER TECH SPEC 3.5.F.1. TURBINE MAINTENANCE INSPECTION REVEALED EXCESSIVELY WORN TURBIN4 IOIL PUMP DRIVE GEARS. THERE WERE NO PREVIOUS SIMILAR OCCURRENCES. THE REDUNDANT 0

jHPCI SYSTEM WAS OPERABLE AT ALL TIMES DURING THIS EVENT.

7 8 0 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE 7 8 IC1E (

9 10 11 12 B J IT 1U IR B I INI 13 18 19 Z IZ]

20 SEQUENTIAL OCCURRENCE REPORT REVISION LER/RO EVENT YEAR REPORT NO. CODE TYPE NO.

17 NUMBER I [L7 ..J LQJJJ2 W_.. LDJ WoI3 Li- 1Loi

.21' 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHTIJIDOWN ,\ ATTACHMENT NPRD-4 PRIMECOMP. COMPONE NT TAKEN ACTION ON PLANT . ME THOD HOURS 22 SUBMITTED FORM SUlt. SUPPLIER MANUFACT URER 33 34 LU@LE_~-L(DJ 35 J@_ 1._J 36 37 lo lo lol 40 41 Y]

42 N.@1E]

43 IT 11 14 44 17 J47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 10RCTC TIRBITNE OTT, PUMP DRTVE GEAR FATTURE WAS DUE TO ABNORMAL WEAR CAUSED BY USE OF I 1 TMPROPER MATERTALS FOR GEARS. WORN GEARS RFPLACTD WTTH TDENTTCAT. STEEL GEARS 017] OF I 1 2 I STOCK. REPLACEMENT GEARS TO BE ORDERED WILL BE MADE OF BRONZE AND STEEL TO PRECLUDE I T3TI lEXCESSIVE GEAR WEAR PROBLEM. RCIC TURBINE IS TERRY TURBINE TYPE GS-1, PART NOS. 40 I f 1 1AND 52 ON PARTS LIST 77574E. 1 7 139 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION

[ E 2 1J1 1L0 10 1(B NA - JB j OPERATOR OBSERVATION 7 8 9 10 12 11 44 45 46 80 ACTIVITY CONTENT flft.EA.SED OF IIELTA!;F AM UXOATVT N LOCATION OF NA AMOIR I 01:

FIELEASE0 EEPLOW@Ll 11 ACTI VITY S I 7 8 DrILZ 9

0A~l OF 10 zI L NA I 44 45 NA 80 PERSONNEL FXPOSUES NUMBER TYPE. D)ESCRIPTION

[

7 8

]IOo0L 31 9 11 12

]I 13 NA 8o PERSONNEL INJUilIES NUMBER DESCIIIPTION E LElololo 1 89 II 11 12 NA 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION EEJI9 Z11 1 8 10 NA s0 PURLICITY NRC USE ONLY IS;UED DESCIIIPTION II I 1N 6NA 9 10 6 6980 5

NAME OF PREPARER S. J HA*ER PHON 612/295-5151 o 79O806 es