05000263/LER-1979-001-03, /03L-0 on 790110:during Normal Operation,Steam Leak Found in Elbow on Turbine Main Steam Bypass Header 1 Inch Drain Line to Condenser,Due to Erosion Caused by Steam & Water Flow of Restricting orifice,RO-2569

/03L-0 on 790110:during Normal Operation,Steam Leak Found in Elbow on Turbine Main Steam Bypass Header 1 Inch Drain Line to Condenser,Due to Erosion Caused by Steam & Water Flow of Restricting orifice,RO-2569

ML112760120
Person / Time
Site:	Monticello
Issue date:	02/02/1979
From:	Tobin P Northern States Power Co
To:	NRC/OI/RGN-III/FO
Shared Package
ML112760121	List: 05000263/LER-1979-001, Forwards LER 79-001/03L-0 05000263/LER-1979-001-03, /03L-0 on 790110:during Normal Operation,Steam Leak Found in Elbow on Turbine Main Steam Bypass Header 1 Inch Drain Line to Condenser,Due to Erosion Caused by Steam & Water Flow of Restricting orifice,RO-2569
References
LER-79-001-03L-01, LER-79-1-3L-1, NUDOCS 7902080187
Download: ML112760120 (3)

LER-1979-001, /03L-0 on 790110:during Normal Operation,Steam Leak Found in Elbow on Turbine Main Steam Bypass Header 1 Inch Drain Line to Condenser,Due to Erosion Caused by Steam & Water Flow of Restricting orifice,RO-2569

Event date:
Report date:
2631979001R03 - NRC Website

text

REGULATO INFORMATION DISTRIBUTION STEM (RIDS)

ACCESSION NBR.:7902080187 DOC.DATE: 79/02/02 NOTARIZED:

No

(

FACIL:50-263 Monticello Nuclear Generating Plant, Northern States AUTH.NAME AUTHOR AFFILIATION TOBIN,P.A.

Northern States Power Co.

RECIP.NAME RECIPIENT AFFILIATION Region 2, Atlanta, Office of the Director DOCKET #

050002630 W

S.UBJECT: LER 79-001/03L-0 on 790110sduring normal ope.ration,steam leak found in elbow on turbine main steam bypass header I inch drain line to condenser,due to eroshon caused by steam

& water flow of restricting orifice,RO-2569.

DISTRIBUTION CODE-: A002S COPIES RECEIVED:LTR 4 ENCL SIZE.:J TITLE.: INCIDENT REPORTS NOTES,:

)ACTLON:

I NTERNALs RECIPIENT ID CODE/NAME 05 BC 6'64 14 TA/EDO 16 EEB 18 PLANT SYS BR 20 AD PLANT SYS 22 REAC SAFT BR 24 KREGER 26 AD/SITE ANAL 28 LACDENT ANLYS COP IES LTTR ENCL 4

4 1

1 1 2

.1 RECIPIENT ID CODE/NAME 02 NRC PDR 11 MPA 15 NOVAK/KNIEL 17 AD FOR ENGR 19 I&C SYS BR.

21 AD SYS/PROJ 23 ENGR BR 25 PWR SYS BR 27 OPERA LIC BR E JORDAN/IE COPI ES LTTR ENCL 1

1 1

3 EXTERNAL.:

03 LPDR 29 ACRS 16 16 1

16 04 NSIC 1

I S..

Cs TOTAL NUMBER OF COPIES REQUIRED: LTTR 0

0 45/' ENCL 45

NORTHERN STATES POWER COMPANY MINNEAPOLIS. MINNESOTA 85401 February 2, 1978 Mr J G Keppler Office of Inspection &

U S Nuclear Regulatory 799 Roosevelt Road Glen Ellyn, IL 60137 Enforcement Commission

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Bypass Header Drain Line Steam 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, REGUPLATORY'T DOnEC y L 0 Mayer, PE Manager of Nuclear Support Services LOM/DMM/deh cc:

Director, IE, USNRC (30)

Director, MIPC, USNRC (3)

MPCA Attn:

J W Ferman 7902 0 8 0 /

- oer

- over-

NIH: I 0tIM.100i (1- /

II. I NIIC I All III lilt AIttIIYt:ulMMINIIIOIIN 11-1/1 LIC.NSLL I.:V NI HU.i'OH I CON a1101 III.OCK:

(I LAsr: lIIIN I It I YPE ALL IIEOUIIIED INFOIIMATION)

I MI NI MI NI P1 1101 0 ol - l 01 ol ol ol -l ol ol l 41 11 1 1 O L jO 9

LICENSEE CODE 14 is LICENSE NUMI1i 7b 26.

LICENSE TYPE JO 57 CAT 58 SORC'E L1@610 Is 10 lo 10 12 16 13 DI 01 1ii1 i 01 71 91@1 01 21 01 21 71 910 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES I DURING NORMAL OPERATION, A STEAM LEAK WAS DISCOVERED IN A 90 DEGREE ELBOW ON THE E[] J 7

8 CON'T [0]

7 8

F05-1]

[0]

040 7

8 7

8 7

8 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SURCODE COMPONENT CODE SUBCODE SUBCODE 1H1E [nJ@ LAJO IP I PIEl X XI L[

Z_

9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT LER/RO EVENT YEAR REPORT NO.

CODE TYPE 1:7 REPORT Lj 9

01 0 11 L

1oL1 L0J 1

NM 21 22 23 24 26 27 28 29 30 31 ACTION FUTURE EFFECT SHUIDOWN ATTACHMENT NPRD-4 PRIME COMP.

TAKEN ACTION ON PLANT METHOD HOURS (D SUBMITTED FORM SUBl.

SUPPLIER.

JB J@LF @ LJ@

LJJO l ol ol ol LJ 00J1 LAJ 33 34 35 36 37 40 41 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 0 LEAK IS BELIEVED TO BE DUE TO ERUSI 1 STRICTING ORIFICE, RO-2569, UPSTREAM DRAIN LINE DOWNSTREAM OF RO-2569 TO 7

8 9

FACILITY STATUS

%POWER OTHERSTATUS [0

1@

11 olo l l

NA1 8

9 10 12 13 44 ACTIVITY CONTENT RELEASED OF 1ELEASED AMOUNI Or ACTIVITY 1 [B] UU1L~

NA1 7

8 9 10 11 44 PERSONNEL EXPOSUFIES NUMBER TYPE

DESCRIPTION

W 1 I nI ni J LJ 1 NA 7

8 9 11 12 13 PERSONNEL INJURIES NUMBER DESCHIPTIONLB [LE lolol 1

1B NA 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

6 III DIZ z1 NA 7

8 9

10 P1 LI CITY I"sSUED) 1ESCIIIPTION 7

I 8

9 10 NAME OF PREPARER P'. A.

I.DIN N CAUSED BY FLOW OF STEAM AND WAI R

80 8o REVISION NO.

Lo i 32 COMPONENT MANUFACTURER B1 31 41 5 (D 4

47 OM RE-OF ELBOW. LEAKING ELBOW WAS WELD REPAIRED.

I BE MODIFIED DURING FUrURE OUrAGE.

p 80 METHOD OF DISCOVERY DISCOVERY DESCRIPTION 0

L B01 OPERATOR OBSERVATION 45 46 80 I

NA 45 LOCATION OF RELEASE so 80 80 02080/9-7 80 NRC USE ONLY 6869 511 PHONE:

612/295-5151l TURBINE MAIN STEAM BYPASS HEADER 1" DRAIN LINE TO THE CONDENSER. THIS CONSTITUTED I

A DEGRADATION OF A SYSTEM DESIGNED TO CARRY RADIOACTIVE MATERIAL RESULTING FROM I

THE FISSION PROCESS.

(T.S. 6.7.B.2.d) SEVEN PREVIOUS SIMILAR OCCURRENCES (M-RO-76-01A 16, 24; M-RO-77-19; and M-RO-78-07, 13, 27) NO AFFECT ON PUBLIC HEALTH OR SAFETY.

I I

80

- J L

L

• 1 I

80