ML112760138

LER#78-022/03L-0 on 781117:steam Leak Was Discovered in a 1 Wye Strainer,YS-4002,on the Main Steam Equalizer Drain Line. Leak Caused by a Defective Casting & Dev After Two Days of Svc

ML112760138
Person / Time
Site:	Monticello
Issue date:	12/15/1978
From:	Tobin P Northern States Power Co
To:
Shared Package
ML112760139	List: ML112760138 ML20062F682
References
LER-78-022-03L, LER-78-22-3L, NUDOCS 7812200215
Download: ML112760138 (4)

Text

) - REGULATORY TNFORMATI.ON DISTRIBUTION SY0_ M (RIDS)

ACCESSION NBR:78-122002.15 OC.DATE: 78/12/15 NOTARIZD: NO DOCKET #

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

AUTH.NAME AUTHOR AFFILIATION TOBIN,P.A. NORTHERN STATES POWER

• RECIP.NAME RECIPIENT AFFILIATLON

)

SUBJECT:

LER#78-022/03L-0 on 781117.:steam leak was discovered in A 1" )

WYE Strainer,YS-4002,on the main steam equalizer drain line.

Leak caused by a defective casting & dev after two days of

) svc.

DISTRIBUTION CODE-: A002S COPIES RECEIVED:LTR _ ENCL _J SIZE.:L/

) TITLE: INCIDENT REPORTS NOTES: /9I> 7- 9 f A2 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL

• ACTION: 05 BC 6R6#3 4 4 I NTERNi0FL 1 F 02 NRC PDR 1 09 I&E 2 2 11 MPA 3 3 14 HANAUER I 1 15 NOVAK/KNIEL 16 EEB .1 .1 17 AD F.OR ENGR 18 PLANT SYS BR I .1 19 I&C SYS BR 20 AD PLANT SYS I 1 21 AD SYS/PROJ 22 REAC SAFT BR I J 23 ENGR BR 24 COLLINS 0 0 24 KREGER 0 25 PWR SYS BR I 1 26 HOUSTON 0 0 26 VOLLMER I 1 E JORDAN/IE 1 1 EXTERNAL: 03 LPDR 1 16 04 NSIC 1 1 27 ACRS 16 16

'lop"

,%L' 19-1 19>8 TOTAL NUMBER OF COPIES REQUIRED: LTTR 43 ENCL 43 z 0

• - REGULATORY NFORMATION DISTRIBUTION SY EM (RIDS)

ACCESSION NBR.:7812200211 DOC.DATE: 78/12/15 NOTARI D: NO DOCKET #

) FACIL:50-263 MONTICELLO #1, NORTHERN STATES POWER Co. 05000263(@

AUTH.NAME AUTHOR AFFILIATION MAYER,L..O. NORTHERN STATES POWER

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

)

SUBJECT:

Forwards LER #78-022/03L-0.

DISTRIBUTION CODE,: A002S COPIES RECEIVED:LTR ENCL SIZE.:

TITLE: INCIDENT REPORTS NOTES:

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

• ACTION: 05 BC 4 4 INTERNAL: 01 REG FILE 1 1 02 NRC PDR I 09 I&E 2 2 11 MPA 3 3 14 HANAUER 15 NOVAK/KNIEL 16 FEB 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 23 ENGR BR 24 COLLINS 0 0 24 KREGER 25 PWR SYS BR 26 HOUSTON 0 0 26 VOLLMER E JORDAN/IE 1 1 EXTERNAL.: 03 LPDR 16 1 04 NSIC I I 0

27 ACRS 16 16 0

0 TOTAL NUMBER .OF COPIES REQUIRED: LTTR N

43 ENCL 43

NORTHERN STATES POWER COMPANY MINNEAPOLIS, MINNESOTA 55401 December 15, 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 Main Steam Line WYE Strainer Leak 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.(d) since it represents abnormal degradation of a main steam system component.

Yours very truly, L 0 Mayer, PE Manager of Nuclear Support Services LOM/DMM/deh cc: Director, IE, USNRC (3 0)pr Director, MIPC, USNRC (3) E MP CA DOCETL FILE COPY Attn: J W Ferman

-over N\o~ 2 781220021

NItC I OIM 31.4t U). N. NIJCI I All III (GlU.A IO(Y COMMINSIUN 1/ 11)

LICLNSEE EVLNTI HEPOH I CONTROL BLOCK: [ (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 8 9 I NJ NI LICENSEE CODE NI P[I 'IQI 0 101 -1 14 15 1 01 01 0NUMBEH LICENSE 10 10 1- 10 1 0lQ 4[j11 25 26 11 11 1J1 LICENSE TYPE 30 57 CAT 58 (D

CON'T REPORT SOUR CE L J(6 l

1 07 5 01 51 01 01 01 01 21 DOCKET NUMBER 61 3k3Ili 68 69 11 1l EVENT DATE 7l 11 18jIl 7 8 74 l

75 11 2l1 j I51 REPORT DATE 5l 7l 18808 7 8 60 61 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES 3

-j I DUING NORMAL OPERATION, A STEAM LEAK WAS DISCOVERED IN A 1" WYE STRAINER, YS-4002, ON THE MAIN STEAM EQUALIZER DRAIN LINE. THIS CONSTITUTED A DEGRADATION OF A SYSTEM

[F[T]

DESIGNED TO CARRY RADIOACTIVE MATERIAL RESULTING FROM THE FISSION PROCESS (T.S. 6.7.B.

2.d.). NO PREVIOUS SIMILAR OCCURRENCES. NO EFFECT ON PUBLIC HEALTH OR SAFETY.

0O61 7 8 080 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE

[B 0 LB SUBCODE COMPONENT CODE FIF IILITIEIRIO L SUBCODE IL SUBCODE 7 8 9 BLLB 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION CODE TYPE NO.

REPORT NO.

17 0 REPO LER/RO UBE LL EVENT YEAR S - 10 1 21 2 --- 10 13 I ] I R 21 2? 23 24 26 21 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD 4 PRIME COMP. COMPONENT 2

TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM bUB. SUPPLIER MANUFACTURER LXJLAJ 33 34 LJ@ z J 35 36 37 0 00 1 40 41 I i3 42 LX 1@I 43 44 M 4 l 7 37 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS LEAK DUE TO DEFECTIVE CASTING, A LEAd DEVELOPED AFTER IWO D u S EVIVL.

WYE TYPE STRAINER, MODEL NO. 862-BC, BODY MATERIAL CAST CARBON STEEL A216 WCB 1" INLET AND OUTLET, 1/2" BLOWOFF, 600# RATING. STRAINER ISOLATED AND LEAK PLUGGED TO PREVENT IN- LEAKAGE TO CONDENSER. ST RAINER TO BE REPLACED DURING FUTURE PLANT OUTAGE.1 I

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

1 ]

8 L

9 E

(

10 0 61 6 l 12 13 NA 44 45 46 80 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE E I LI_ z L NAI I NA 45 45 80 80 I

PERlSONNEL FXP(JSUIILS I C I I IO N 7

W oo60 8 9 INi I UI H 1

i0Z1 I 11 1

l3NA 80 PERSONNEL iNJUlS NUMBE TE CRIP IONHI lo0 lo 1 11 12 N

80 7 8 9 LOS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION EE8 L zal NA 80 7 9 10 80 PUBLICI1Y NRC USIE ONLY ISUEDI ) DESCRIPTION WI] Iz 181 1 8 9 10 NA ... .

68 69 80 &

0 NAME OF PREPARER P. A. TOBIN PHON* 612/295-5151 7812 200216 Cw