05000263/LER-1979-017-03, /03L-0:on 790806,steam Leak Observed on Feedwater Extraction Steam Line Drain 15A.Caused by Steam Erosion Through Wall of Steam Trap on Line.Trap Isolated Pending Repair or Replacement at Next Appropriate Outage

/03L-0:on 790806,steam Leak Observed on Feedwater Extraction Steam Line Drain 15A.Caused by Steam Erosion Through Wall of Steam Trap on Line.Trap Isolated Pending Repair or Replacement at Next Appropriate Outage

ML112900903
Person / Time
Site:	Monticello
Issue date:	08/31/1979
From:	Hammer S Northern States Power Co
To:	NRC/OI/RGN-III/FO
Shared Package
ML112900904	List: 05000263/LER-1979-017, Forwards LER 79-017/03L-0 05000263/LER-1979-017-03, /03L-0:on 790806,steam Leak Observed on Feedwater Extraction Steam Line Drain 15A.Caused by Steam Erosion Through Wall of Steam Trap on Line.Trap Isolated Pending Repair or Replacement at Next Appropriate Outage
References
LER-79-017-03L-01, LER-79-17-3L-1, NUDOCS 7909050517
Download: ML112900903 (3)

LER-1979-017, /03L-0:on 790806,steam Leak Observed on Feedwater Extraction Steam Line Drain 15A.Caused by Steam Erosion Through Wall of Steam Trap on Line.Trap Isolated Pending Repair or Replacement at Next Appropriate Outage

Event date:
Report date:
2631979017R03 - NRC Website

text

REGULATURY \\NFORMATION DISTRIBUTION SY EM (RIDS)

ACCESSION NBR:7909050$17 DOC.DATE: 79/08/31 NOTARIZED: NO FACIL:50*263 Monticello Nuclear Generating Plant, Northern States AUTHNAME AUTHOR AFFILIATION HAMMER,8.

Northern States Power Co, RECIP.NAME RECIPIENT AFFILIATION Region 3, Chicago, Office of the Director DOCKET #

05000263 SUBJECT: LER 79-017/031-0 on 79 806:steam leak observed on 15A feedwater extraction steam line drain.Caused by steam erosion through wall of steam trap on line.Irap isolated pending repair or replacement at next appropriate outage, DISTRIBUTION CODE: A004S COPIES RECEIVED:LTR -/ ENCL L SIZE: /4-f TITLE: Incident Reports NOTES:-.------

RECIPIENT ID CODE/NAME ACTION:

05 BC OR INTERNAL:

EG FILE 14 TA/EDO 16 EEb 18 PLANT SYS BH 20 AD PLANT SYS 23 ENGR BR 25 PWR SYS BR 27 OPERA LIC BR 29 AUX SYS BR HANAUERS.

TMI-H STREET COPIES LTTR ENCL 4

4 1

2 1

1 1

1 1

1 1

1 1

1 RECIPIENT 1D CODE/NAME 02 NRC POR 11 MPA 15 NOVAK/KNIEL 17 AD IOR ENGI 19 T&C SYS BR 22 REAC SAFT BR 24 KREGER 26 AD/SITE ANAL 28 ACDENT ANLYS E JORDAN/IE STS GRUUP LEADR COPIES LTTR ENCL 1

3 1

1 1

1 1

1 1

1 1

EXTERNAL:

TOTAL NUMBER OF COPIES REQUIRED: LTTR 6665 fKt?

LI 03 LPDR 29 ACRS 1

16 1

16 04 NS1C 1

1 48 ENCL 188

NORTHERN STATES POWER COMPANY MINNEAPOLIS. MINNESOTA 55401 August 31, 1979 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 Steam Leak -

15A FW Heater Extraction Steam Line Drain 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 in that this event involved abnormal degradation of a system designed to contain radioactive material.

Yours very truly, O

ay nager of Nuclear Support Services LOM/JAG/jh cc:

Director, IE, USNRC (30)

Director, MIPC, USNRC (3)

MPCA Attn:

J W Ferman 790905ost'

- over-Nr

N4IlC FOIIM 366

(/ /1)

[LI]

7 8

CON'T 7

8 78 08-2 7

8 U. S. NUCLEAR1 IIEGULATOIIY COMMISSION I

I 9

80 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE [H

LHLJ LEj X ]~

l9 X I Xl Xj X1 Xj XIq LxJ Lz j r0T9 IHJ Li Li IXXXXXXI-j j

7 8

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

CODE TYPE NO.

1 REPORT 17 19 1 -

10 11 17 1

[J l 01 31 L ]

Lo]

NUME IL

--j 10 L

21 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 22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER LX JSLA 1 Z

ZJ@

10 10 lo 1I LNJ@

LNJ@

LAJ@

lY 10 110 l 33 34 35 36 3740 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (2)

IThrough wall erosion was due to insufficient amount of maintenance for trap repairs. I 1 71 Erosion may be considered normal end of life for component under these conditions.

2 Steam trap was Yarway 3/411 600# carbon steel body bucket type trap. The trap was I

isolated pending repair or replacement at next appropriate outage. Steam trap I

- 4 maintenance program will be expanded.

7 8

q 80 FACILITY METHOD OF STATUS

%POWER OTHERSTATUS DISCOVERY DISCOVERY 32 1IE L E 11 10 10 11 NA I L BThI Operator Observation 0 7

8 9

10 12 13 44 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY @

LOCATION OF RELEASE 16 Lj Lz l N^

I I

NA 1

8 9

10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

TI o 0o 01 1i Z (3 NA 7

8 9

11 12 13 80 PERSONNEL INJURIES NUMBER DESCRIPTIONS L0F 1 0 1 0 1@1 NA 7,

8 9

11 12 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

EEI z 6I NA I

R 0

N U1 PUBLICITY ISUED

DESCRIPTION

N 161I NA 7909050s(-7li HI~I 7

8 9

10 Steve Hamer (612) 29-5151 NAME OOCATION OFHRELEASE PH#

5 o

w LICENSEE EVENT REPORT CONTROL BLOCK:

L (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

MINI MINI Plo1l-0 101-10 o lo o

10 l - lol ol 4 1 _1 11 11 101 1 9

LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 REPORT I

C REEL 0j 5101 10 1 216 13 1 10 18 10 161 719 1010 18 13 I' 17 19 10 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (During a routine operator inspection, a steam leak was observed on the 15A feedwater extraction steam line drain. The leak appeared to be due to steam erosion through l

Ithe wall of the steam trap on this line. This constitutes an abnormal degradation of I a system designed to contain radioactive material as required by Technical Specifi-I cation 6.7.B.2.d. There were no previous similar occurrences.

PREPAPFP 26 NAME OF