ML20098H021
| ML20098H021 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 09/28/1984 |
| From: | Bauereis E BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8410090261 | |
| Download: ML20098H021 (4) | |
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BALTIMORE GAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE. MARYLAND 21203 ELECTRIC ENGINEERING DEPARTMENT September 28, 1984 Region 1
.U.S. N.R.C.
631 Park Avenue King of Prussia, PA 19406
Dear Sirs:
Appendix B-Part II of the Facility Operating License Nos. DPR-53 and DPR-69 Calvert' Cliffs Nuclear Power Plant in the Environmental Protection
~ Plan Section 4.1 states unusual fish kills are to be reported. Regulatory Guide'10.1 Appendix A No.'181, Nonroutine Environmental Operating Report, requires' notification within 30 days of the event.
0n August 28, 1984 Calvert Cliffs Nuclear Power Plant Unit 1 reactor.and turbine were manually tripped. At 9:50 p.m. on August 28, 1984
- 11 circulating water pump was stopped when 11A and 11B traveling screens
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develo' ped a'h0 inch differential water level due to a massive influx of
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fish blanketing the screens. Subsequently, at 9:56 p.m. 12A and 12B screens developed a differential water level of 50 inches resulting in stopping #12 circulating water pump and the reactor was manually tripped.
The Outside Operators Log for August 28, 198h shows severe _ anoxic conditions in the Chesapeake Bay adjacent to the Calvert Cliffs Nuclear Power Plant.
In the early afternoon (1 p.m.) when oxygen concentrations should be greater than 5.5 mg/1, the diasolved oxygen measured 1.7 mg/1. The severe anoxic conditions (less than 3 mg/1) at least 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> before the impingement event probably resulted in severely stressed or morbid fish. Under these unusual circumstances there is little that can be'done to prevent the fish kill but the Biofouling Task Force is working to improve the performance of the traveling screens.
Copies of the report by the biologist performing the impingement sampling and the Outside Operators Log for August 28, 1984 are attached.
8410090261 840928 PDR ADOCK 05000317
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If you have any questions regarding this letter report, please call me at 301/234-6533.
Sincerely,
, Pld Elizabeth I. Bauereis, PhD Senior Biologist EIB/few Attachment cc: Document Control Desk 9
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RESEARCH MUSEUM EDUCATION BENEDICT ESTUARINE RESEARCH LABORATORY September 20, 1984 Dr.-Elizabeth I. Bauereis Baltimore Gas-and Electric Company 1 Center. Plaza P. O.-Box 1475 Baltimore, MD 21203
Dear Dr. Bauereis:
Please accept this letter as a formal report of an unusually large impingement event at the Calvert Cliffs Nuclear Power Plant on 28 August 1984.
Impingement sampling was scheduled to begin at 2100 hrs at Unit-2.. When I. arrived at the site there were large numbers of fish in the intake embayment; however, very few fish were-collected during a 15_-min sampling period.
Subsequent sampling at Unit 1 yielded a somewhat higher impingement rate (~50/ min).
The dissolved oxygen (DO) level in front of intake screen llA at
- 2100 hrs was 3.0 mg/1.
By 2140 the impingement rate had increased to ~1000/ min with a corresponding DO of 1.1 mg/1.
At 2150.the' impingement rate had jumped to ~3000/ min.
The majority of impinged fish
(~95%) were spot-(Leiostomus xanthurus) with the remainder.
comprised of Atlantic menhaden (Brevoortia tyrannus) and Atlantic croaker (Micropogonias undulatus).
The high impingement rate continued until 2230,by which time the DO level had fallen to 0.2 mg/1.
At 2300 hrs DO levels had risen to 2.0 mg/l and impingement rate had dropped to ~250/ min.
The impingement rate continued to decrease and by 2400 hrs was less than 20/ min.
If you have any comments on this report or require further information regarding this unusual event, please call me.
Sincerely,,
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. Howard Hixson III Biologist JHH:ja BENEDICT, MARYLAND 20612. (301) 274-3134
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