ML112760140

LER#78-021/03L-0 on 781114:during Refueling Outage While Testing RHR SW Sys,A Pinhole Leak Was Discovered in CV-1729, RHR SW Differential Pressure Control Valve.Caused by Corrosion & Erosion of Upper Valve Body

ML112760140
Person / Time
Site:	Monticello
Issue date:	12/14/1978
From:	Overlid T Northern States Power Co
To:
Shared Package
ML112760141	List: ML112760140 ML20062F721
References
LER-78-021-03L, LER-78-21-3L, NUDOCS 7812200287
Download: ML112760140 (4)

Text

REGULATORY INFORMATION DISTRIBUTION -SYTEM (RIDS) 0 ACCESSION NBR:7812200287 DOC.DATE: 78/12/14 NO T AR D: No DOCKET #

FACIL:50-263 MONTICELLO #1, NORTHERN STATES POWER CO. 05000263(

AUTH.NAME AUTHOR AFFILIATION OVERLID,T.W. NORTHERN STATES POWER

) RECIP.NAME RECLPIENT AFFILIATION

) SUBJECT.: LER#78-021/03L-0 on 781114:durinq refueling outage while test RHR SW sys,a pinhole leak was discovered in CV-1729,RHR SW differential pressure control valve.Caused by corrosion 0 & erosion of upper valve body.

DISTRIBUTION CODE.: A002S COPIES RECEIVED:LTR _ ENCL SIZE:_ L TITLE: INCIDENT REPORTS NOTES:-_

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL

• ACTION: 05 BC ORS #3 4 4 INTERNAL: 1 1 02 NRC PDR 2 2 11 MPA 31 31 14 HANAUER 15 NOVAK/KNIEL 16 EEB 17 AD FOR ENGR 18 -PLANT SYS BR 19 I&C SYS BR 20 AD PLANT SYS 21 AD SYS/PROJ 22 REAC SAFT BR .1 23 ENGR BR 24 COLLINS O0 0 24 KREGER 25 PWR SYS BR 26 HOUSTON 1 0 26 VOLLMER E JORDAN/IE 1 EXTERNAL: 03 LPDR 16 04 NSIC 1 I 27 ACRS 16 16 0

DEC 211978 A

TOTAL NUMBER OF COPIES REQUIRED: LTTR 43 ENCL 43 3 0

REGULATORY INFORMATION DISTRIBUTION S TEM (RIDS)

ACCESSION NBR:7812200283 DOC.DATE.: 78/12/14 NOTAR #D: NO DOCKET #

) FACIL:50-263 MONTICELLO #1 , NORTHERN STATES POWER CO. 05000263(0 AUTH.NAME AUTHOR AFFILIATION MAYER,L.O. NORTHERN STATES POWER

) RECIP.NAME RECIPIENT AFFILIATION KEPPLER,J.0. **REG.3,CHICAGO,OFF.OF THE DIRECTOR

)

SUBJECT:

Forwards LER#78-021/03L-0.

DISTRIBUTION CODE: AOO2S COPIES RECEIVED:LTR ENCL SIZE:

) TITLE: INCIDENT REPORTS NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL

• ACTLON: 05 BC 4 4 INTERNAL: 01 REG FILE 1 1 02 NRC PDR 1 09 I&E 2 2 11 MPA 3 3 14 HANAUER 15 NOVAK/KNIEL 16 EEB 17 AD FOR ENGR 18 PLANT SYS BR 1.9 I&C SYS BR 20 AD PLANT SYS 21 AD SYS/PROJ 22 REAC SAFT BR 1 23 ENGR BR 0

24 25 COLLINS PWR SYS BR 0 24 KREGER 0 26 HOUSTON 0 0 26 VOLLMER E JORDAN/IE 1 1 EXTERNAL: 03 LPDR I1 1 04 NSIC I 1 27 ACRS 16 16 TOTAL NUMBER OF COPIES REQUIRED: LTTR 43 ENCL .43

0 NORTHERN STATES PO.WER COMPANY MINNEAPOLIS. MINNESOTA 55401 December 14, 1978 Mr J G.Keppler Office of Inspection & Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Pinhole Leak in RHR SW Valve 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) since it represents a condition leading to operation in a degraded mode permitted by a limiting condition for operation (Specification 3.5.C.3).

Yours very truly, REGULATORY DOCKET FILE COPY LP Mayer, FE'

)Tnager of Nuclear Support Services LOM/JAG/deh cc: Director, IE, USNRC (30)

Director, MIPC, USNRC (3)

MP CA Attn: J W Ferman oft 781?2t0003 -over-S

AJ .,NUC An ,ri G , ., V~lAA I N NRC OI tIIM.It 4 I LICLNSLL EI.VN I ILPOIi CON ItOI II LOCK: 0 (PLEASE PR4INI Oil TYPE ALL REQUIRED INFORMATION) 01 IM lN IM IN IP 11 10 10 l- 10 10 10 NUMUCH 10 10 l- 10 10 lD1 16

'1 41 1l 1l 1YPE LICENSE 1I

.0 bl CAT 68 I

it 9 LICENSE COO(L 14 1 LICENSE CON'T 0E 1Ir'I"L& IS 10 10 10 12 16 l3 11 l1 l 14 17 18 l@111 21 1l 41 71 8 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 7 8 60 61 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES 10 DURING REFUELING OUTAGE WHILE TESTING THE RHR SW SYSTEM, A PINHOLE LEAK WVAS DISCOVERED IN CV-1729, RHR SW DIFFERENTIAL PRESSURE CONTROL VALVE. REPAIRS WERE COMPLETED WELL WITHIN THE ALLOWABLE OUT OF SERVICE TIME AS PERMITTED BY T.S.

3.5.C.3. NO PREVIOUS SIMILAR EVENTS. THE REDUNDANT RHR SW LOOP WAS OPERABLE AND TESTED DAILY IN ACCORDANCE WITH T.S. THERE WERE NO EFFECTS ON PUBLIC HEALTH OR SAFETY.

78

'1 80 SYTM SYSTEM CAUSE CUE CAUSE CUSIUP COMP. 'VALVE AV CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE ISIBI L @ LJ

[B I91VIAlLIVI ElXI L HL iGi 8 10 11 12 13 18 19 20 7 9 SEQUENTIAL OCCURRENCE REPORT REVISION NO.

Q)REPORT1!7 1021 LER/RO VENT YEAR 8.J J~ . REPORT NO.

11I CODE LTYPE

~ 2 R21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED . FORM SUB. SUPPLIER MANUFACTURER 1_ xJ@ [z10 35 IZI 36 1 37 01010101 40I 41 NJ LDNJ 42 IAj 43 44 B12 19 0 (2 47 33 34 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS

-- -.-.. rr. ~ .TA~rT C' fl" CAUSE OF LEAK WAS CORROSION AND EROS ION OF UPPER VALVE BUD. VALVE 1S 10 , 300#

] DOUBLE PORT DP CONTROL VALVE, SERIA L NUMBER 70-105, 475, BODY MAT. ASTM A216-WCB.

AFFECTED AREA GROUND OUT AND FILLED. WITH WELD METAL. SIMILAR VALVE IN REDUNDANT SYSTEM WVAS INSPECTED DURING 1975 REF UELING OUTAGE AND NO SIGNS OF BODY CORROSION OR I 4 EROSION WERE OBSERVED. BOTH VALVES WILL BE INSPECTED DURING NEXT REFUELING OUTAGE.

7 8 9 FACILITY METHOD OF 80 STATUS  % POWER OTHERSTATUS & DISCOVERY DISCOVERY DESCRIPTION

[ LIHI@ 01 01 011N 1 L BJ@1 OPERATOR OBSERVATION 7 8 0 10 12 11 44 45 46 80 80 ACTIVITY CONTENT RELEASED OF HELEASE AMOIN 01 ACTIVIIY 6 LOCATION OF RELEASE EE 7 8 IIo LA Z @

9 L Z 10 I

11 l1l NALI 44 45 80 PERSONNEL FXPOSUIIES NUMBIEH TYPF DESCHIIPION S 7 8 I

9 0 0 0iLz 11 12

]@ 13 NA 80 80 PERSONNEL INJURIES NUMBER DESCRIPTION I1 E lo0 0 10 1l NA 80 80 7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE T @1 zNA I DESCRIPTION ri12o0 o7 7 8 9 10 80 PUBLICITY NRC USE ONLY ISSUED DESCRIPTION CED LJ101 7 8 9

• 1I r

NA . 68 69 80 5 612 /29S- S1S1 0a NAME OF PREPARER T. W. OVERLID rrlulN- - 0