ML19260B163

LER 79-041/03L-0:on 791102,noted That No Effluent Data Reported for Radwaste Bldg Ventilation Monitoring Sys Since Oct 1978.Caused by Inadequate Design of Effluent Monitoring Sys.Mods Made to Enable Calibr of Detectors

ML19260B163
Person / Time
Site:	Oyster Creek
Issue date:	12/03/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19260B155	List: ML19260B154 ML19260B163
References
LER-79-041-03L, LER-79-41-3L, NUDOCS 7912070345
Download: ML19260B163 (3)

Text

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LICENSEE EVENT REPORT  !

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7 8 60 61 COOK ET NUMSER 68 69 EVENT CATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h a  : ! The new radwaste building ventilation monitoring system was not in ser- [

O 3, l vice in a manner which could yield accurate effluent data f om the time l 0 14 l radioactive materials were introduced into the building in October 1978 l 0i5 ; to the present. Therefore, no effluent data for this release point was ]

c le t i reported for this period in violation of T.S. 6.9.3c(1)a. The equipment I ci,l as installed was mechanically functional; however, several modifications l IOial l were necessary to facilitate detector calibration and data reduction. j 7 E 9 20 SYSTEM CAUSE CAUSE COMP. VALV E 00 ,0 000E SU3000E 00VPONENT000E 5;.,2 00 0 E 5:.;S000 E 7

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44 47 cAusE DEScRIPTICN AND COARECTIVE ACTIONS i Ol The cause of this occurrence is attributed to inadequate design of the j i i I ef fluent monitoring system. Modifications have been made which enabled i 7 calibration of the detectors for reduction of data. Filters are being ]

i 3 l removed and analyzed at the same frequency as for stack effluent path.

i 4 l The same program will be performed on the A0G system prior to operation. l 7 8 9 80

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Madtson Avenue at Punch Bowl Road Mornstown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-41/3L-0 Report Date December 3, 1979 Occurrence Date November 2, 1979 Identification of Occurrence Failure to report effluent releases as per Techr.ical Specifications, paragraph 6.9.3.c(1)a, parts 1, 2 and 3 Conditions Prior to Occurrence The plant was operating at steady state power. The major plant parameters at the time of the occurrence were:

Powe r: Reactor, 1768.4 MWt Generator, 602 MWe Flow: Recirculation, 14.5 x 104 gpm Feedwater, 6.6 x 106 lbm/hr Stack Gas Flow: 3.5 x 104 pCi/sec Description of Occurrence The new radwaste building ventilation monitoring system was not in service in a manner which could yield accurate effluent data from the time radio-active materials were introduced into the building in October 1978 to the present. Therefore, no effluent data for this release point was reported for this period.

The equipment, as installed, was mechanically functional; however, several modifications were necessary to facilitate calibration of the detectors and proper reduction of the data. These modifications consist of installation of valves for calibration of the gaseous detector and a total flow monitor /

recorder for correlating sampled isotopes to total quantitles released, it should be noted that for a short period of time, the Augmented Off Gas Building was operated under the same condition for test.

1511 304 Jersey Central Power & Light Company is a Member of the General Pubhc Ut;l t:es System

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Reportable Occurrence No. 50-219/79-41/3L-0 Page 2 December 3, 1979 Apparent Cause of Occurrence The cause of the occurrence was attributed to an inadequate design of the effluent monitoring system (lack of ability to calibrate the gaseous monitor) and the failure of plant management to recognize the reportability of the releases through the radwaste ventilation system.

Analysis of Occurrence Although no complete data is available for this period, the expected total effluents released should be very low and only a small fraction of the isotopes released via the stack. The total ventilation flow passes through HEPA filters; therefore, essentially all of the particulate isotopes would be removed. Two rolls of filter paper were counted that would have run for approximately one month apiece. One had only background quantities of Cobalt 60 and Manganese 54 on them. The other roll indicated' concentrations that were comparable with stack effluents. There was a period of time when the HEPA filters plugged and were torn in some places but there is no way to correlate this period with the time the filter paper was on.

Several lodine cartridges were installed on a nonscheduled basis. These were counted and the concentrations of lodine 131 found were about 0.1% of normal stack effluents. As the total flow of the ventilation system is approximately 35,000 CFM as compared with a stack flow of 163,000 CFM, the total radwaste

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release would only be about 0.025% of the stack release.

The sources for gaseous activity are very limited in the new radwaste build-Ing. They are limited to any entrained gases in the liquid waste and decay of oidine to xenon in the var:ous wastes. This would no reflect any noticeable increase over stack releases.

Corrective Action Modifications to the system have been completed which enabled calibration of the detectors for reduction of data. Filters are being removed and analyzed at the same frequency as for stack effluent path. The same program will be performed for the Augmented Off Gas System prior to placing it in operation.

Failure Data Not applicable.

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