ML19326B660
| ML19326B660 | |
| 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 8004170507 | |
| Download: ML19326B660 (3) | |
Text
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1.
. Non-Routin~e, Non-Radiological Environmental Report No..50-313/75-21 2.
Report Date:
2/28/75 3.
Occurrence. Date:
2/22/75 4
Facility:
Arkansas Nuclear One-Unit 1
.Russellville, Arkansas 5.
Identification of Occurrence:
J Fish kill on intake screens ' exceeding 3000 pounds based on 24-hour sample period.
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Conditions Prior to Occurrence: -
Steady-State Power
'y Reactor Power h530 bMth Hot, Standby Net. Output 838 FMe Cold Shutdown Percent of Full \\ Power 99 %
Refueling Shutdown I
Routine Startup Opera tion Routine Shutdown i
Operation Load' Changes During Routine Power Operation Other (Specify)
Four circulating w'ater pumps were in operation.
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7.
Description of Occurrence:
t During routine fish impingement monitoring 2/22/75, using procedure 1607.10, Ibnitoring Fish Impinged on ANO-1 Intake Screens, 4425 pounds of fish were' collected during a 24-hour sample period beginning at-8:00 a.m. 2/21/75 and ending at 8:00 a.m. 2/22/75.
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 we.ight.. Threadfin shad made up 97% of.
Other the total number of shad.
Intake water temperature, taken at 8:00 a.m. 2/21/75 was 46*F.
air temperature was 54'F.
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July 5, 1974 7
NSP-10, Rev. b Page 1 of 3
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Non-Routino, Non'-Radiological Environmenta'1. Report No. 50-313/75-21 a
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Designation of Apparent Cause of Occurrenec:
Proc' dure Design c
6 Manufacture Unusual.Servico Condition Including Installation /
Environmental Construction
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Component Failure Operator Other '(Specify) i' 1he apparent cause was due to a natural die off of threadfin shad during the winter season.
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'9.
Analysis.of Occurrence:
There has been no apparent adverse environmental impact due to the large numbers of shad being impinged at the intake of ANO-1.
h' inter-
, time mortality of threadfin shad due to low temperatures is not m_
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unusual due to their lack of resistance to low water temperatures.
j The ANO-1 intake screens only collect the shad after they become J
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 in population each yinter and still mainta'in a population suitable,for forage by game fish.
The fish that were collected during sampling periods were disposed of through landfill operation.
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- 10. Corrective Action:
Long term studies are in progrdss to determine the effects of plant operation on the aquatic ecosystgms of the Dardanelle Rescrvoir., Data from this report and other data ob,t,ained is fed back into these studies to determine what. changes might be made to the studios in order to ensure that adequate data is obtained for' evaluating plant impac.t.
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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July.5, 1974 NSP-l'D;' Rey. O Page 2 of 3
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t V) t Non-Routino, Non-Itadiological Environmental Report Nb. 50-313/75-21
- 11. Failurc Data:
The circumstances of this report are similar to those reported in Non-Routino, Non-Radiological ' Environmental Reports No. 50-313/75-1 through 50-313/75-20.
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Reviews and Apyrovals:
Reviewed and Approved by: Plant Safety Committec Yes (X)
No ( )
Plant Superintendent
.Yes (X)' 'No ( )
Referenco:
JIVA-882 Date: 2/26/75 i,
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Reviewed by:
o Date: 2 27 7d' Licensing' Supervisor
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Approved b M d &,.
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2 Date: M-M-2\\'
Sa ty e icw Committee Approved by:
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- #4 474 Date: 2 ilanager of Nuc1 car S
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ces hyproved by:
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Dato: $
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Director of I ower Product)o'n Approved by:
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Date: 2
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July 5,'
1974 NSP-10,H[v.O Page 3 of 3