ML20084K259
| ML20084K259 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/24/1974 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-50-265-74-17, NJK-74-174, NUDOCS 8305190241 | |
| Download: ML20084K259 (3) | |
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k Commo calth Ediscn v,)# g+ 2 Quad-Cities Generat:ng Station If Od Post Office Box 216
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Cordova Illincis 61242 V%
Telephone 309/654-2241
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i July 24,1974
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g Mr. John F. 0 ' Leary, Di rector Directorate of Licensing Regulation U. S. Atomic Energy Conraission Washington, D. C.
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Reference:
Quad-Cities Nuclear Power Station Unit 2 Docket No. 50-265, DPR-30, Appendix A S ect ions 1.0.A.2, 3.8.E, and 6.6.B. I.a
Dear Mr. O ' Leary:
- Enclosed please find Abnormal Occurrence Report No. 50-265/74-17 for quad-Citics Nuclear Power Station. This was previously reported to Region ill, Directorate of Regulatory Operations by telephone on July 16, 1974, and to you cr.d Reg!
- r !!!, O!recter :: Of R:gul:ter; Up:r:t!:r.: b; : !:: p; c-July 16, 1974.
This report is submitted to you in accordance with the requirements of Tech-nical Speci fication 6.6.B. I.a.
Very truly yours, COMM0lNEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION
!. c.4{b.aw N. J. Kalivianakis Station Superintendent NJK/JZM/j eh cc: Region ill, Directorate of Regulatory Operations J. S. Abel f
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REPOR'r NUNBER: A0 265/74-17 REPORT DATE: July 25, 1974 OCCURRENCE DATE: July 15. 1974 FACILITY: Quad-Cities Nuclear Power Station Cordova, I llinois 61242 IDENTIFICATION OF OCCURRENCE:
Having more than 2 curies in radwaste tank farm for more than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
CONDITIONS PRI'OR TO OCCURRENCE:
Unit 2 running at steady state operation at about 690 MWe, Unit i in shutdown condition.
DESCRIPTION OF GCCURRENCE:
At about 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> on July 14, 1974, two condensate demin, phase separators and one cleanup phase separator were decanted into the waste surge tank. This water transfer operation was discovered at about 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> by Radiation Protection person-nel who noted an increase in waste surge tank level. The tank was immediately put on recirculation and a subsequent sample taken at about 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br />. Analysis rc-vealed that the curie inventory was arcater than 2 curies.
DESIGNATION OF APPARENT CAtISE OF OCCURRENCE:
The apparent cause of this occurrence was the decanting of radioactive water from the two condensate phase separators and a cleanup phase sepas ator to the waste surge tank.
ANALYSIS OF OCCURRENCE:
The maximum curie content in radwaste was 5.05 curies. After reprocessing for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, 2.75 curies stil: remained in the tank farm. Curie content was back within limits (1.68 ci) at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on July 16, 1974.
To evaluate any possible exposure problems to plant personnel, dose rates were set on the tank farm. These dose rates ranged from 20 mr/hr at the bottom of the tank to 12 mr/hr at about 8 feet up the side of the tank. The dose rate around the perimeter of the tank farm was 5 mr/hr. No measurable increase in dose to plant personnel was noted for the time period of the uncorrected condition.
CORRECTIVE ACTION:
\\later was transferred from the waste surge tank to' the collector tanks to be renroc-essed. Later, water was recirculated f rom the waste surge tank through a demincral-izer and then back into the waste surge tank. Additionally, a pernanent change has been initiated in station procedure 41-253 to include sampling cleanup phase separa-tors and condensate phase separators before transferring water to the waste surge tank.
O auiv 25. isa A0 50-265/7.4-17_
2-F l!.URE DATA:
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Equipment failure did not occur in this abnormai oc'currence. This is, however, the second time that the 2 curie limit has been exceeded. The first time, the curie Inventory was reduced to icss than 2 curies within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
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