ML19326B667
| ML19326B667 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 02/28/1975 |
| From: | Cavanaugh D, Murphey W, Rueter D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326B649 | List: |
| References | |
| NUDOCS 8004170513 | |
| Download: ML19326B667 (3) | |
Text
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77 Q
- 1. ~ Non-Routine, Non'-Radiological Environmental Report No.. 50-313/75-22 2.
Report Date:
2/28/75 3.
Occurrence Date:
2/23/75 4
Facility:
Arkansas Nuclear One-Unit 1 Russellville, Arkansas 5.
Identification of Occurrence:
Fish kill on intake screens exceeding 3000 pounds based on 8-hour sample-i period.
6.
Conditions Prior to Occurrence:
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Steady-State Power
'X Reactor Power 2540 bMth
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Hot Standby X
Net. Output 838 FMe Cold. Shutdown Percent of Full Power 99 %
Refueling, Shutdown Routino Startup Operation Routino Shutdown Operation Load Changes During Routine Power Operation T' rip 9 16':08 Other (Specify)
Four circulating water pumps were in operation.
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Description of Occurrence:
i During routine fish impingement monitoring 2' 22/75, using procedure
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1607.10, Monitoring Fish Impinged on ANO-1 Intake Screens, 2710 pounds of fish were collected during an 8-hour sample period.
The projected fish kill for the 24-hour period beginning at at 8:00 a.m. 2/22/75 and ending at 8:00 a.m. 2/23/75 was 8130 pounds based on the 8-hour sample.
A mixture of gizzard and threadfin shad made up 99.9% of the total weight of fish. Other fish made up 0.1% of the total weight.
Threadfin shad made up 981b of the total number of shad.
Intake water temperature taken at 4:00 p.m. 2/22/75 was 47*F, and ambient air temperature was 49'F.
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July 5, 1974 NSP-10, Rev. 0 Page 1 of 3
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i Non-Routino, Hon'-Radiological Environment:il. Report No. 50-313/.75-22 g
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Designation of Apparent Cause'of Occurrence:
Design Proi:cdurc Manufacturo Unusual Service Condition Including Installation /
Environmental Construction
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Component Failure Operator Other (Specify) s The apparent cause was due to a natural die off of threadfin shad during the winter season.
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'9.
Analysis.of Occurrence:
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- 1 Thero has been no apparent adverse. environmental impact due to the large numbers of shad being impinged at the intake of ANO-1.
}Vinter-
, time mortality of threadfin shad due to low temperatures is not
.I unusual.due to their lack of resistance to low water temperatures.
The ANO-1 intake screens only collect the shad after they become
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unable to resist the intake current due to lethargy caused by a decrease in water temperature.
Due to their fecundity,threadfin shad can withstand a substantial decrease 19 population each pinter and still mainta'in a population suitabl.e for forage by game fish.
t The fish that were collected during sampling periods were disposed of through landfill operation. The fish that were not collected Werc ground in a trash grinder and returned to Lake Dardanelle.
- 10. ' Corrective Action:
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Long, term studies are in progress to determine the effects af plant operation on the aquatic ecosyst,, ms of the Dardanelle Reservoir.
Data e
from this report and other data obtained is fed back into these studies to determine what. changes might be made to the studies in erder to ensure that adequate data is obtained for evaluating plar.c impact.
Review by Arkansas Power 6 Light Company and its consultant-; of the results of these studies Will determine what corrective action might be taken to reduce plant effects on the reservoir.
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July 5, 1974 NSP-ID; Rev. 0
'Page 2 of 3
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Non-Routine, Non-Radiological Environmental Report No. 50-313/75 22 11.
Failure Data:
The circumstances of this report are similar to, those reported in Non-Routine, Non-Radiological Environmental Reports No. 50-313/75-1 through 50-313/75-21.
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12.
Reviews and Approvals:
Reviewed and Approved by: Plant Safety Committee Yes (X)
No ( )
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Plant Superintendent Yes (X)
No ( )
Referenec:
JWA-882 Date: 2/26/75' Reviewed by:
((hs Date:
YW e
Licensing Supervisor Approved by:
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.-6.-c.Y. fp Datc: "2.3,RYF'
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Sa[t iew Committe /
i Approved by:
MA Date: 2- /
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il ja ager of Nucicar Mvices
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Approved by:
Mrp 2.3./[
Date:. O V #~2 )'~~
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Directo'r of Power Pro'dyction Approved by:
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)ff73' er Dato:
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Senfor Vico J osi'd/nt
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July 5, 1974 NSP-10, Rev. O Fage 3 of 3
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