ML20112C224
| ML20112C224 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/26/1984 |
| From: | Bauereis E BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8501110090 | |
| Download: ML20112C224 (2) | |
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50-517 BALTIMORE I OAS AND
[0 " J j g ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 December 26, 1964 Region 1 USNRC 631 Park Avenue King of Prussia, PA 19h06
Dear Sirs:
According to Appendix B - Part II to the Facility Operation License Nos. DPR-53 and DPR-69 Calvert Cliffs Nuclear Power Plant, the Environ-mental Protection Plan Section 4.1 unusual fish kills are to be reported.
Also, according to Regulatory Guide 10.1 Appendix A No. 181 Nonroutine Environmental Operating Report requires notification of the event.
On November 16, 1984, Calvert Cliffs Nuclear Power Plant began to experience impingement of large numbers of Norfolk spot, Leiostomus xanthurus. Similar impingement numbers occurred either soon after sunset or in the early morning hours on November 17, 18, 19, 198h. The plant continued to operate by alternate stopping the affected water pumps until screen differential pressure was diminished and the fish removed. At 5:15 P.M. on November 21,198h an influx of spot caused a rapid increase in 11,12,13 and 1h travelling screens differential pressures on Unit 1.
The reactor was manually tripped in order that the associated circulating water pumps could be turned off and screen damage avoided. Again on November 23, 1984 travelling screens 16A and 16B on Unit 1 had ten trays boved due to high differential pressure caused by fish impingement. Also on November 21 and 22,198h, numbers 2h and 26 circulating water pumps were stopped due to high travelling screen differential pressures caused by impingement of Norfolk spot.
The fish when examined appeared sluggish probably due to the rapid onset of a cold front that dropped the intake water temperature from 57.3 F on November 16, 1984 to 54.8 F three days later. Norfolk spot usually migrate out of the Chesapeake Bay into the ocean and are usually through the peak of outward migration by the end of October (see Hilde-brand and Schroeder,1972). Probably due to the mild fall weather the Bay water temperature remained in the lov 60's and the spot did not migrate out in the usual time frame and suffered from cold shock from the sudden onset of the cold weather period.
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, If you have any questions regarding this report, please call me (301) 234-6533 Sincerely,
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liz eth I. Bauereis, Ph.D.
Senior Biologist EIB/jm cc: Document Control Room A. E. Lundvall, Jr.
C. H. Cruse P. T. Crinigan G. R. Fuhrman R. C. L. Olson L. B. Russell J. A. Tiernan
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