05000327/LER-1980-071-03, /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

/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: 05000327/LER-1980-071, Forwards LER 80-071/03L-0 05000327/LER-1980-071-03, /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
References
LER-80-071-03L, LER-80-71-3L, NUDOCS 8006200484
Download: ML19318A400 (2)

LER-1980-071, /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

Event date:
Report date:
3271980071R03 - NRC Website

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EVENT oESCRirTioN AND Paes ASLE CONSEQUENCES O'o rirTT'l I The rupture disk on the boric acid evaporator was found ruptured.

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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.

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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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