ML19326B656
| ML19326B656 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 02/28/1975 |
| From: | Cavanaugh W, Murphey W, Rueter D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326B649 | List: |
| References | |
| NUDOCS 8004170503 | |
| Download: ML19326B656 (3) | |
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Non-Routine,.Non-Radiological Environmental Report No.. 50-313[75-20
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Report Date:
February 28, 19753. Occurrence Date: February 21, 1975 4
Facility:
Arkansas Nuclear One-Unit 1 Russellville, Arkansas 5.
_ Identification of Occurrence:
Fish kill on intake screens exceeding 3000 pounds based on 24-hour sample period.
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6.
Ccaditions Prior to Occurrence:
Steady-State Power x
Reactor Power 2530 FMth Hot, Standby Net. Output 838 Miie Cold Shutdown Percent of Fu11' Power 99 I
Refueling Shutdown Routine Startup Operation
[mh Routine Shutdown i
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Operation Load' Changes During Routine Power Operation Other (Specify)
Four circulating water pumps were in operation.
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Description of Occurrence:
During routine fish impingement mointoring 2/21/75, using procedure 1607.10, of fish were' collected during a 24-hour sample period beg 8:00 a.m. 2/20/75.and ending at 8:00 a.m. 2/21/75.
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and threadfin shad made up 99.9% of the total weight of fish.A mixture of gizzard fish made up 0.1% of the total weight.
Other Threadfin shad made up 98,% of the total number of shad.
Intake water temperature, taken at 8:00 a.m. 2/21/75 was 45'F, and ambient air temperat'ure was.44*F.
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8004170 503 i
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(V Non-Routine, Hon'-Radiological Environmental. Report.No. 50-313/75-20
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Designation of Apparent Cause'of Occurrence:
Design Proc'cdure Fhnufacture Unusuti Servic'c Cccdition Including Installation /
'nvironmental i
Construction
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Component Failure Opera, tor Other (Spscify)
The apparent cause was due to a natural die off of threadfin shad during the winter season.
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Analysis.cf Occurrence:
t There 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 Oi unusual due to their lack of resistance to low water temperatures.
The ANO-1 intake _ screens only collect the shad after they become e
unable to resist the intake current due to lethargy caused by a decrease in water temperature.
Due to their fecundity, threadfin sh'ad can withstand a, substantial decrease 19 population each pinter and still mainta'in a population suitable fo' r f' rage by game fish, o
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s The fish that were collected during sampling periods were disposed of through landfill operation.
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Corrective Action:
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Long term studies are in progress to determine the effects of plant operation on the aquatic ecosyst, ems of the Dardanelle Reservoir. Data from this report and other data obtai'ned is fed.back into these studies to determine what. changes might be made'to the studies in order to ensure that adequate data is obtained for evaluating plant impact.
Review by Arkansas Power 6 Light Company and its consultants 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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I July 5, 1974 NSP-l'D', Rev. O Page 2 of 3
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Non-Routine. Non-Radiological Environmental Report No. 50-313/75 20 11.
Failurc 11ata:
The circumstances of this report are similar to those reported in Non-Routine, ~ Non-Radiological ' Environmental Reports No. 50-313/75-1 through 50-313/75-19.
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Reviews and Approvals:
s Reviewed and Approved by: Plant Safety Committee Yes (X)
No (- )
Plant Superintendent Yes (X)
'No ( )
Reference:
JWA-882 Date: 2/26/75',
v Reviewed by:
2 Date:
M 7d Licensing Supervisor Approved b
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Date: 2 -dFO C 5-S fety view Commi ce 2!. ?r Approved by:
9 Date:
f.b ager of Nucica crvices
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Approved by:
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Datc: /2 -2.[Oci
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Director o'f Power Producti n-2 />
7 Approved by:
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'Date:
,Seniorlic/Preddent
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Nj July 5, 1974 NSP-10, Rev. O P:mr 3 nf T
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