05000312/LER-1982-027, Forwards LER 82-027/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-027/03L-0.Detailed Event Analysis Submitted

ML20028B611
Person / Time
Site:	Rancho Seco
Issue date:	11/16/1982
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20028B612	List: 05000312/LER-1982-027, Forwards LER 82-027/03L-0.Detailed Event Analysis Submitted 05000312/LER-1982-027-03, /03L-0:on 821012,weekly Surveillance of Nitrogen Sys Revealed Presence of Contamination in Form of Xe-133. Cause Undetermined.Sys Purged & Activities Reduced to Below Detectable Levels.Investigation Underway.Rept Will Follow
References
NUDOCS 8212030081
Download: ML20028B611 (1)

LER-1982-027, Forwards LER 82-027/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3121982027R00 - NRC Website

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f i$SMUD SACRAMENTO MUNICIPAL UTIUTY DISTRICT O 6201 S Street. Box 15830, Sacramd@(d.g la 95813; (916) 452-3211 Olh y November 16, 1982 BEgg 4t._.

R H ENGELKEN, REGIONAL ADMINISTRATOR REGION V 0FFICE OF INSPECTION AND ENFORCEMENT U S NUCLEAR REGULATORY COMMISSION 1450 MARIA LANE SUITE 210 WALNUT CREEK CA 94596 DOCKET N0. 50-312 LICENSE DPR-54 LICENSEE EVENT REPORT N0. 82-27 In accordance with Rancho Seco Nuclear Generating Station Technical Specifications, section 6.9.4.2.d and Regulatory Guide 1.16, section C.2.b.4, the Sacramento Municipal Utility District hereby submits a 30-day report of Licensee Event Report Number 82-27.

On October 12, 1982, the weekly Nitrogen System surveillance showed Xenon-133 activity in the Auxiliary Building Nitrogen header. Activities measured at the sample point through a valve N6S 526 were Xe-133 at 4.49 E-2 pci/ml, K-85M at 1.04 E-3, X-133M at 3.76 E-3, and Xe-135 at 2.26 E-2.

The system was subsequently flushed and activity was reduced to below detectable levels.

On September 9, 1982, a similar situation was observed and reported under LER 82-23. The Plant Review Committee met and designated a special engineering subcommittee to determine the source of this repeated low-level contamination.

A program was developed that will allow the source to be identified. This program is under way and when results are obtained, action will be taken to prevent recurrence. A follow-up report to this LER (which will serve as follow-up to LER 82-23) will be written, defining cause and corrective action. This report should be generated by December 1982, although the final corrective action may be delayed until the next refueling outage, early in 1983.

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

[e ht M 4 7

ohn. Mattimoe General Manager cc:

DCD, Washington INP0 8212030081 821116 DR ADOCK 05000312 PDR Ah (LECTRIC SYSTEM SERVING MORE THAN 600,000 IN THE HEART OF CAL