ML19318A400

LER 80-071/03L-0:on 800517,rupture Disc on Boric Acid Evaporator Found Ruptured,Providing Path for Contents of Waste Gas Decay Tank to Escape Into Room.Cause Unknown.Event Not Immediately Discovered Due to No Radioactivity in Tanks

ML19318A400
Person / Time
Site:	Sequoyah
Issue date:	06/16/1980
From:	Record D TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318A392	List: ML19318A391 ML19318A400
References
LER-80-071-03L, LER-80-71-3L, NUDOCS 8006200484
Download: ML19318A400 (2)

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! rirTT'l I The rupture disk on the boric acid evaporator was found ruptured.

g l This-provided hpatti Vis "the' no'nco'ndensible gas vent on the BA g 8 . . .

o a evaporator for the ' contents of the waste gas decay tank 'to escape - .  ;

g i ntoi the BA evaporator room. The rate of escape whs relatively I

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' i o IThe rupture disk on the boric acid evaoorator was found ructured I

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,,. t. Sequoych Nuc10cr Plant LER SUPPLEMENTAL INFORMATION

,, SQRO-50-327/ 8071 Technical Specification Involved 6.9.1.13.d Reported Under Technical Specification 6.9.1.13.d Date of Occurrence: 5/17/80 3-11 shift Identification and Description of Occurrence:

The rupture disk on the boric acid evaporator was found ruptured.

This provided a path via the noncondensible gas vent on the BA evaporator for the contents of.the waste gas decay tank to escape into the BA evaporator room.

Conditions Prior to Occurrence:

Unit 1 in Mode 3 Apparent Cause of Occurrence:

Cause of ruptured disk unknown.

Analysis of Occurrence: i There was no danger to public health and safety. ,p Corrective Action:

Requested Engineering Design to further investigate this LER in that rupturing the rupture disk will not cause an uncontrolled release.

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Failure Data:

This was the first event of this nature.

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