ML20087K058

RO 76-18:on 760514,found That Radioactive Matls Release Rate of Halogens & Particulars W/Half Lives Greater than 8 Days Exceeded 9.6E-02 Uci Per Second.Cause Under Investigation

ML20087K058
Person / Time
Site:	Fort Calhoun
Issue date:	05/14/1976
From:	William Jones OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20087K052	List: ML20087K058
References
HLWR, RO-76-18, NUDOCS 8403230248
Download: ML20087K058 (1)

Text

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Director, o 9 U. S. Nuclear Regulatory Co:mnission Office of Inspection and Enforcement  :

Region IV 611 Ryan Plaza Drive - i Suite 1000 Arlington, TX 76012 ,

Licensee Event Report 50-285/76-18 Iodine and Particulate Airborne Release ,

In accordance with Fort Calhoun Technical Specifications, Licensee Event Report 50-285/76-18 is reported in violation of Technical Specification 2 9(2)b. During preparation of radioactive effluent release data summary for report submittal, it was found that the radioactive materials release rate of halogens and particulates with half lives greater than eight days exceeded 9.6E-02 microcuries per second for a containment purge performed on February 21, 1976. The release rate after the purge was completed indicated a release rate of 0.43 microcurie per second. The purge was performed in accordance with proper procedures and controlled conditions. However, the final release rate was approximately five times greater than the recommended rate of the release permit. The difficulty to totally control effluent releases less than 10,000 cfm had previously been identified. No radiation alarms were experienced by any airborne effluent monitors during the release. Monthly surveillance tests and testing prior to the individual release have not revealed any abnormal condition. A review of the monitor recording for the gaseous effluent monitor (RN 0-62), the particulate effluent monitor .

(PaiO--61) cnd the iodine effluent menitor (P2:0-60) indicate the Technical Specification release rates were not exceeded.

A review of analytical procedures and assumptions has been initiated.

It is suspected that the computer based gamma spectrometer used for isotopic analysis may have identified iodine-131 activity below its sensitivity due ,

to broad energy range selection and interferring gamma radioactivity attri-butable to noble gases.

This confirms the telephone conversation'between W. D. Dermyer, Manager- "f %

Fort Calhoun Station and Mr. G. L. Mads n, NRC-0IE at 1740 on May 14,1976, p

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V.C.Jon(eb Ni3U ?F SGl/ Section Manager 4 Operations cc: Director of Licensing U.S.NuclearRegulatoryCo=missfon Washington, DC 20545 8403230248 760526 PDR ADOCK 05000285 S PDR

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