05000260/LER-1980-017-03, /03L-0:on 800310,while Performing Surveillance Instruction 4.5.E.1,HPCI Turbine Tripped.Caused by Failed Rupture Disc in Turbine Exhaust Line.Rupture Disc Replaced

/03L-0:on 800310,while Performing Surveillance Instruction 4.5.E.1,HPCI Turbine Tripped.Caused by Failed Rupture Disc in Turbine Exhaust Line.Rupture Disc Replaced

ML18024B475
Person / Time
Site:	Browns Ferry
Issue date:	04/08/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B474	List: 05000260/LER-1980-017, Forwards LER 80-017/03L-0 05000260/LER-1980-017-03, /03L-0:on 800310,while Performing Surveillance Instruction 4.5.E.1,HPCI Turbine Tripped.Caused by Failed Rupture Disc in Turbine Exhaust Line.Rupture Disc Replaced
References
LER-80-017-03L, LER-80-17-3L, NUDOCS 8004140436
Download: ML18024B475 (4)

LER-1980-017, /03L-0:on 800310,while Performing Surveillance Instruction 4.5.E.1,HPCI Turbine Tripped.Caused by Failed Rupture Disc in Turbine Exhaust Line.Rupture Disc Replaced

Event date:
Report date:
2601980017R03 - NRC Website

text

U. S "" CLEAR REGULATORYCOMMISSION

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~02 CONTROL BLOCK:

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9 LICENSEE CODE LICENSEE EVENT REPORT

,0 tPLEASE PRINT OR TYPE ALLREQUIRED INFORMATIONI 2

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0 14 15 LICENSE NUMBER 0

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I I 04~I 25 26 LICENSE TYPE 30 57 CAT 58 08 8

OOB REPORT DATE 80 REPoRT ~LQG 0

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0 0 GO 61 DOCKET NUMBER 68 69 EVEhIT DATE 74 75 EVENT DESCRIPTION AND PROBABLE COEISEQUENCES QIO With unit,at stead state ower of 51 ercent surveillan e i str

~03 was being perf ormed when HPCI turbine tri ed due to a failed ru ture disc in the turbine exhaust line, renderin HPCI ino erable Technical S ecification 3.5.F.

There was no danger to health or safety of t:he public no si nificant resultin chain of events.

RCIC, CS, ADS and RHR LPCI roven o erable.

Previous occurrence BFRO-50-259/79027.

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CAUSE CO" IP VALVE CODE CODE SUBCODE COMPONFNT CODE SUBCODE SUBCODE

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LERJAO FVENT YEAR REPORT No.

CODE TYPE NO.

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~o 2'I 22 23 24 26 27 28 29 ACTION FUTURE FFFECT SHUTDOWN ATTACHh1ENT NPRDP PRlh1E CohIP.

COIEIPONENT TAKEN ACTION ON PLANT METHOD HOURS 22 SUBMITTED FOAhl SUB.

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3 Qzs 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 0

The teflon sheet portion of the disc failed rovidin no rotect:ion to the dis under vacuum condition.

Ru ture disc re laced.

DCR 1956 h s b to improved type rupture disc.

Fike 1fetal Prod.

16" Hdl PLHOV Teflon S.S.

181 bs at 378 Deg.

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9 11 12 LOSS OF OA DAMAGE To FACILITY TYPE

DESCRIPTION

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FACILITY STATUS 44 POWER OTHER STATUS

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Qs NA METHOD OF DISCOVERY 45 45 80 NA LOCATIONOF RELEASE 80 80 80 80 80 NRC USE O VLY i222222J.ELLi2:

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DISCOVERY DESCRIPTION 32 Surveillance Test

,'c.r:nessce Valley Authn:.!

Br oui'ns Ferry Viue)ear Plant Pong ','l'. 'v BF'1'ltt~:.

LER SUPPI.EPIZNTAL INFORMATION BI'I'tO-SO-26o / 8017 Technical Specification Involved l<epovted Under Technical Specification 6

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Date of Occurrence 3/1o/g0 Time of Occurrence 3.5.E.l Unit identification and Dcscrictton

'of Occurrence:

Rupture disc failed on HPCl exhaust causing ttip of HPCl.

Failure occurred during SI with unit at 51% power.

Conditions Prior to Occurrence:

Unit 1 8 0% refueling outage.

Unit 2 8 51%

Unj.t 3 8 100%

Action specified

!n the Technical Specification Surveillance Requirements nr..

due to inferable equ~itnerrt.

Describe.

SI's were run on RHR, Core spray, ADS and RCXC.

Apoarent Cause of Teflon sheet failed Cause of the Teflon fatigue.

Occur vence:

providing no protection to rupture disc under vacuum condition.

sheet failure is unknown but is believed to be due to normal Analysis of Occur r'<:ncc:

TEere was no signa.fiant resulting event and no danger to health or safety of the public.

Corrective Action

The rupture disc was replaced.

type to rupture disc.

DCR 1956 has been issued to change the improved Failure Data:

BPRO-50-259/79027

~Retention:

eriod - Lifetime; Responsibility - Administrative Supervisoi