05000312/LER-1982-023, Forwards LER 82-023/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-023/03L-0.Detailed Event Analysis Submitted

ML20028B642
Person / Time
Site:	Rancho Seco
Issue date:	10/06/1982
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20028B643	List: 05000312/LER-1982-023, Forwards LER 82-023/03L-0.Detailed Event Analysis Submitted 05000312/LER-1982-023-03, /03L-0:on 820909,weekly Nitrogen Sys Surveillance Showed Xe-133 Activity in Auxiliary Bldg Nitrogen Header. Cause Undetermined.Investigation Will Be Conducted.Followup Rept on Cause & Corrective Actions Will Be Provided
References
NUDOCS 8212030110
Download: ML20028B642 (1)

LER-1982-023, Forwards LER 82-023/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3121982023R00 - NRC Website

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'$suun 9P SACRAMENTO MUNICIPAL UTILITY DISTRICT O 5tJ1 S Street, Bo Sacramento, California 95813; (916) 452-3211 892 C 8 pp 97y October 6, 1982 REGION V!zi R H ENGELKEN, REGIONAL ADf11NISTRATOR REGI0il V 0FFICE OF INSPECTION Af40 ENFORCEMENT U S liUCLEAR REGULATORY C0!111SSION 1450 tiARIA LAiiE SUITE 210 WALNUT CREEK CA 94596 DOCKLT h0. 50-312 LICEf1SE NO. DFR-54 REPORTABLE OCCURRENCE N0. 82-23 In accordance with Rancho Seco fluclear Generating Station Technical Specifications, section 6.9.4.2.d and Regulatory Guide 1.16, section C.2.b.4, the Sacramento Ilunicipal Utility District hereby submits a 30-day report of Licensee Event Report Number 82-23.

On September 9,1982, the weekly Nitrogen System surveillance showed Xenon-133 activity in the Auxiliary Building Nitrogen header. Activity measured at the sample point through valve NGS 526 was 6.28 E-2 uci/ml. A teasure-ment taken upstream at a sample point through valve NGS 525 showed activity of 2.25 E-4 pci/ml.

The Nitrogen System was purged and, subsequently, activities were belou minimum detectable levels. The Plant Safety Review Conraittee met to con-sider specific causes and recommendations for corrective actions. flo immediate cause could be identified, however, since a subsequent review of plant logs indicated that no abnormalities existed in the valve line-ups or system configuration. The Plant Review Cormittee will continue investiga-tion of this problem to determine how the contamination is entering the Nitrogen System, albeit at very low levels. A followup report to this Licensee Event Report will be "rittcn wisen a determination has been made as to source of contamination and corrective actions required.

There were no effects on public or plant safety resulting frora this event.

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John J. flattimoe General f*anager cc: DCD, Washington INP0

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