ML19263B975

LER 78-072/03L-0 on 781227:during Normal Testing Sequence of Reactor Bldg Charcoal Filter Bank,Methyl Iodine Removal Efficiency Determined to Be Less than 99% Contrary to Tech Spec 3.6.4.2.Caused by Pollutants Deteriorating Charcoal

ML19263B975
Person / Time
Site:	Crystal River
Issue date:	01/17/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19263B972	List: ML19263B971 ML19263B975
References
LER-78-072-03L, LER-78-72-3L, NUDOCS 7901260145
Download: ML19263B975 (2)

Text

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SUPPLEMENTARY INFORE\ TION Report No.: 50-302/78-072/03L-0 Facility: Crystal River Unit #3 Report Date: 17 January 1979 Occurrence Date: 27 December 1978 Identification of Occurrence:

Reactor Building charcoal efficiency was less that 99% methr1 Iodine removal contrary to Technical Specification 3.6.4.2.

Conditions Prior to Occurrence:

Mode 1 power operation (95%).

Description of Occurrence:

At 1430, when performing the normal testing sequence of a charcoal filter bank, the methyl Iodine removal efficiency was determined to be less than 99%. The thirty day action statement of Technical Specification 3.6.4.2 was entered. The charcoal was renewed on 11 January 1979 and will be restored operable upon final testing.

Designation of Apparent Cause:

The flue gases and other site airborne pollutants deteriorate the charcoal and its impregnant.

Analysis of Occurrence:

There was no safety hazard to the plant or public as the Reactor Building atmospheric exhaust radiation monitoring system was available and operable.

Corrective Action:

The charcoal was replaced 11 January 1979.

Failure Data:

This is the second occurrence of an event of thi's type.

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