ML20084S274
| ML20084S274 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 03/20/1973 |
| From: | Worden W COMMONWEALTH EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8306160410 | |
| Download: ML20084S274 (1) | |
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1 sW Commonwealth Edison Company 72 WEST ADAMS STRE2T CHICAGO.
ILL1MOIS Aalebens Espir to 9057 QFFICt SON F47
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.liINCIS 60490 WFW Ltr.0244-73 Dresden Nuclear Power Station R.
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March 29, 1972 T
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VU Mr. A. Giambus so Deputy Director for Reactor Frojects t/ 7 Directorate of Licensing dhb U. S. Atomic Encrgy Commission
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20545 SURJECT:
LICENSE DPR 19-25, DRESDEN NifCLEAR POWER STATION, UNITS 2 AND 3 SECTION 6.6. B. 3 OF THE TECHNICA L SPECIFICATIONS.
Dear Mr. Giambusso:
This is to report a condition relating to the operation of the station in which on March 20, 1973, the Radwaste Waste Surge Tank was found :o contain 5.6 curies which exceeds the Technical Specification limit as statc' in Section 3.8.D.
PROBLEM AND INVESTIGATION The following circumstances led to the Waste Surge Tank conte.c cf 5.6 curies:
"A" waste collector filter had been taken out-of-service on D
March 13, 1973 due to suspected crud leaks in the filter septums.
On March 19, 1973 at 2110, "B" waste collector filter and the Radwaste demin-eralizer were taken out-of-service due to high differential pressure across the filter.
Steam cleaning of "B" filter was required. Also at 2110 the water level in the Waste Collector Tank reached 80 pe ccent and continued increasing.
In order to decrease tank level, water from the Waste Collector l
Tank was transferred to the Waste Surge Tank without the decontamination f actor provided by the filter and demineralizer.
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ha Mr. A. Giambusso March 29, 1973 i
At 0015 on March 20, 1973, the Waste Surge Tank was placed on l
recirculation for a sample. At 0130 hours0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-5 months <br />, a sample from the Waste Surge Tank was taken and the analysis indicated 4.3x107 uuC1/1 and a tank curie content of 5.6 curies.
Initial action taken to eliminate the problem consisted of steam cleaning of "B" Waste Collector Filter and placing the filter and demineralizer back in service. At 0926 on March 20, 1973, the Waste Surge Tank was processed through the filter and demineralizer to "C" Waste Sample Tank.
Sample results from "C" Waste Sample Tank at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> indicated the tank curie content was below Technical Specification ibnits.
The presence of 5.6 curies ofB T radioactivity in the water in the above ground tanks did not present a hazard to the public since the contents of the tank were not released to the river and the tank S J radioactivity was reduced to less than Technical Specification limits within 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> following collection and analysis of the first sample.
Had a failure of the Waste Surge Teenk occurred, as described in Admendment #9,Section V.C.1 of the S. A.R., and the radioactivity contained in the tank been released to the aquatic environnwnt, the limits as specified in 10 CFR 20.106 would not have been exceeded when averaged over one year.
CORRECTIVE ACTION In order to minimize the potential for future incidents of this nature, a procedure will bc issued by April 3,1973, requiring sample analysis and calculations of curie content prior to processing the Waste Collector Tank to above ground radwaste storage tanks without the use of either a Waste Collector Filter or the Radwaste Demineralizer.
Sincerely, D..NSb W. P. Worden Superintendent WFW:do i
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