ML20024A383

LER 83-021/03L-0:on 830422,analysis Revealed Adsorption Efficiency for Methyl Iodine of 82.2%.Cause Under Investigation.Charcoal Filters replaced.W/830522 Ltr

ML20024A383
Person / Time
Site:	Indian Point
Issue date:	05/22/1983
From:	Hinrichs G, Otoole J CONSOLIDATED EDISON CO. OF NEW YORK, INC.
To:	Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-83-021-03L, LER-83-21-3L, NUDOCS 8306170197
Download: ML20024A383 (3)

Text

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60 68 69 61 DOCK ET NUMBE R EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES g; On March 15, 1983 the charcoal f ters in the Central Control Pocn Filtration l

, Systcm were replaced and a representative sample of the used charcoal was sent to l

, MSA laboratories for analysis. The analysis revealed an adsorption efficiency l

, for methyl iodine of 82.2%. The charcoal filters are placed in service during l

, Control Ibcm Isolation conditions to reduce potential intake of radiciodines l qg by control rocn personnel. No previous events.

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-[Tl l The cause of the dearadation is still under investirration. 'Pho charmn1 fi 1 +-ore I yl were replaced with fresh charcoal. Our Technical Soecificat-innm rmniro m ,14,nm I gl withRegulatoryGuideI.52(whichstatesthatfiltershouldmeet95% removal I g l' efficiency). However, as part of a recent study of Central Control Room I pl Habitability, it has been determined that a minimum adsorption efficiency of I l 8,Ic,L,7y90%isacceptable. uETHOo OF STATUS  % POWER OTHER STATUS @ O!SCOVERY DISCOVERY DESCRIPTION

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e ATTACHMENT Docket No. 50-247 Consolidated Edison Co. of New York, Inc.

LER 83-021/03L-0 Indian Point Station Unit 2 Event Description and Probable Consequences On March 15, 1983 the charcoal filters in the Central Control Room Filtration System were replaced and a representative sample of the used charcoal was sent to MSA Laboratories for analysis. The analysis revealed an adsorption efficiency for methyl iodine of 82.2%. The charcoal filters are placed in service during Control Room Isolation conditions to reduce potential intake of radiodines-by control room personnel. There were no previous events.

Cause Description and Corrective Action The cause of the degradation is still under investigation. The premature filter degradation may be due to continuous operation of the ventilation system in the incident mode caused by the malfunctioning of the toxic gas monitoring system. Our Technical Specifications require compliance with NRC Regulatory Guide 1 52 (which states that filters should meet 95% removal efficiency). However, as part of a recent study of Central Control Room Habitability, it has been determined that a minimum adsorption efficiency of 90% is acceptable.

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e John D. O'Toole Vce Prescent Consolidated Edison Company of New York inc.

A frying Place. New York. NY 10003 Telephone (212) 460 2533 May 22, 1983 Re Indian Point Unit No. 2 Docket No. 50-247 LER-83-021/03L-0 Mr. James M. Allan, Acting Regional Administrator-Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pa. 19406 Dear Mr. Allant The attached Licensee Event Report LER-83-021/03L-0 is hereby submitted in accordance with the requirements of Technical Specification 6.9.1.7.

This event is of the type described in Technical Specification 6.9 1.7.2.b.

Three copies of this letter and attachment are enclosed as required.

Very truly yours,,

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attach.

cc: Mr. Richard DeYoung, Director (30 copies)

Office of Inspection and Enforcement c/o Distribution Services Branch, DDC, ADM U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. William G. Mcdonald, Director (3 copies)

Office of Management Information and Program Control c/o Distribution Services Branch, DDC, ADM j U. S. Nuclear Regulatory Commission i Washington, D. C. 20555 l Mr. Thomas Foley, Senior Resident Inspector

U. S. Nuclear Regulatory Commission

! P. O. Box 38 i

Buchanan, New York 10511 i

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