ML19209C624

LER 79-022/03L-0:on 790911,halogenated Hydrocarbon Removal Efficiency Found to Be Less than Tech Specs.Caused by Excessive Carbon Filter Leakage.Charcoal Was Removed & Replaced

ML19209C624
Person / Time
Site:	Vermont Yankee
Issue date:	10/11/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209C623	List: ML19209C622 ML19209C624
References
LER-79-022-03L, LER-79-22-3L, NUDOCS 7910160501
Download: ML19209C624 (2)

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. LICENSEE EVENT REPORT LER 79-22/3L CONTROLstOCol l l l l l ]@ (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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2l3l0l@ 47 CAUSE DESCRIPTION nND CORRECTIVE ACTIONS i ,o l The exact mode of the excessive carbon filter leakage could not be determined l i with available testing methods. The failed charcoal was removed and replaced. l

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The gasketed surfaces were verified sealed and the unit successfully retested l 3 ,

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7 8 ) 80 F t.CILITY , YETHOD OF STATUS . P O*.'. E R OTHEH JTATU3 DiSCOLERY DISCOVEHY DESCRIPTION 3 1 9 l E lh l 0l 8l 7lhl NA l B l@l Surveillance Test l AC TIVI T Y CO TENT JELE ASED ';F % LE Ar.F AYOUNT OF ACTli/ITY LOCATION OF RELEASE NA NA i s 3

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VTVYS1 05000271 LER 79-22/3L EVENT DESCRIPTION AND PROBABLE CONSEOUENCES During routine halogenated hydrocarbon surveillance testing of the "B" Standby Gas Treatment Systen (SBGT), the halogenated hydrocarbon re-moval efficiency was found to be 96%. Tech. Spec. Section 3.7.B.2.a re-quires that this efficiency be greater than or equal to 99%. Alternate testing verified the operability of the active components of the "A" SBGT train. As a result, plant operation continued as allowed by Tech.

Spec. Section 3.7.B.3. The "B" SBGT was returned to operation within the seven days allowed by this Tech. Spec. section. Routine surveil-lance testing just prior to this occurrence showed that the active com-ponents of both the "A" and the "B" trains were operable. The "A" train had successfully passed a carbon sample analysis and halogenated hydro-carbon test just prior to this occurrence. Based on the above, there were no adverse consequences of this occurrence to the health and safety of the public due to the reduced ef ficiency of the "B" train carbon filter. There have been no previous SBCT failures due to reduced filter efficiency reported to the Commission.

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