05000296/LER-1981-019-01, /01T-0:on 810423,upper & Lower Gland Seal Condenser Head Gaskets Blew Upon Initiation of HPCI Sys. Caused by Gaskets Stretched Out of Place Due to Overpressurization of Condenser Tube Side.Gaskets Replaced

/01T-0:on 810423,upper & Lower Gland Seal Condenser Head Gaskets Blew Upon Initiation of HPCI Sys. Caused by Gaskets Stretched Out of Place Due to Overpressurization of Condenser Tube Side.Gaskets Replaced

ML19347F457
Person / Time
Site:	Browns Ferry
Issue date:	05/15/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347F456	List: 05000296/LER-1981-019, Forwards LER 81-019/01T-0 05000296/LER-1981-019-01, /01T-0:on 810423,upper & Lower Gland Seal Condenser Head Gaskets Blew Upon Initiation of HPCI Sys. Caused by Gaskets Stretched Out of Place Due to Overpressurization of Condenser Tube Side.Gaskets Replaced
References
LER-81-019-01T-01, LER-81-19-1T-1, NUDOCS 8105190306
Download: ML19347F457 (2)

LER-1981-019, /01T-0:on 810423,upper & Lower Gland Seal Condenser Head Gaskets Blew Upon Initiation of HPCI Sys. Caused by Gaskets Stretched Out of Place Due to Overpressurization of Condenser Tube Side.Gaskets Replaced

Event date:
Report date:
2961981019R01 - NRC Website

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- 80 EVENT CESCRIPTION 4t*D PROsA8tE CONSEQUENCES h f7TTI I During autoriatic reactor shutdown, when the HPCI systeAwas initiated the upper l

[ 5p I and lower HPCI gland seal condenser head gaskets were blown.

'Ihe HPCI was removed i

i n I.i l I from service to replace the gaskets.

There was r., danger to the health or l

l0 lsi i safety of the public. Redundant systems were operable. Previous sim lar events:

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37 40 44 42 43 44 47 CAUSE CESCRIPTION AND CORRECTIVE ACTIONS h liloi i Overpressurization of the tube side of the HPCI gland seal condenser caused the l

liiil l gaskets to stretch out of place. Caskets were replaced. Craham Manufacturina I

,,,,, j Company neoprene gasket; pressure class, 150 psi (design) normal operating pressure I

i,i,il 60 psi.

Special test will be initiated to monitor piping pressures to determine l

wI cause of overpressurization.

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8105190306

Tennessee Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2 3/24/81 LER SUPPLEMENTAL INFORMATION BFRO _ 296 / 81019 Technical Specification involved 3.5.E.1(2)

Reported Under Technical Specification 6.7.2.b(2) l Date of Occurrence 4/23/81 Time of Occurrence 0830 3

Unit

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identification and Description of Occurrence-Unit 3 HPCI inoperable to replace gland seal condenser gaskets.

Condition:, Prior to Occurrence:

Onit 1 refueling outage Unit 2 at 99%

Unit 3 scram due to low reactor water level.

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

Requirements of T.S. 3.5.E.l(2) were met.

Appp ent Cause of Occurrence:

Overpressurizing gland seal condenser (tube side).

Analysis of Occurrence:

There was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant chain of events.

Corrective Action

Replaced head gaskets. Instrumentation will be installed to monitor piping pressures to determine cause of overpressurization.

Failure Data:

B ERO-50-260/ 74016W, 74017W, 74024W, and 74028W i

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