ML19320A299
| ML19320A299 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/07/1975 |
| From: | Cavanaugh W, Phillips J, Rueter D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19320A281 | List: |
| References | |
| NUDOCS 8004210579 | |
| Download: ML19320A299 (3) | |
Text
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Non-Routi'ne, Non Radiological Environmental Report No. 50-313/75-24 2.
Report Date: March 7, 1975 3.
Occurrence Date: February 27, 1975 4.
Facility:
Arkansas Nuclear One - Unit 1 Russellville, Arkansas 5.
Identification of-Occurrence:
Fish Kill on Intake Screens exceeding 3000 lbs. based on 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> sample Period.
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Conditions Prior to Occurrence:
Steady-State Power X
Reactor Power 1357 MNth llot Standby Net. Output 400 Mwe Cold Shutdown Percent of Full Power 52.8 g Refueling Shutdown Routine Startup Operation
'si Routine Shutdown 1
Operation Load Changes During Routine Power Operation Other (Specify) 4 circulating water pumps in operation s:
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Description of Occurrence:
During routine fish impingement monitoring 2-26-75 using procedure 1607.10, Monitoring Fish Impinged on ANO-1 Intake Screens,1055 lb. of fish were collected during an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> sample period. The projected fish kill for the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period beginning at 8:00 a.m. 2-26-75 and ending at 8:00 a. m. on 2-27-75 was 3165 lb. based on the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 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 85% of the total number of shad. Temperatures taken.at 4:00 p. m. on 2-26-75 were:
Intake water temperature 44 degrees F. and ambient air temperature 52 degrees F.
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8004210 h July 5, 1974 NSP-10, Rev. O Page 1 of 3 w
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- Non-Routino, Mon-Radiologica1' Environmental Report No. 50-313/75 24 8.
Designation of Apparent Cause' of Occurrence:
Design Procedure
~ Manufacture -
Unusual Service Condition Including Installation /
Environmental Construction Component Failure Gt.hcr (Specify)
The apparent cause was due to a natural die off of
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Threadfin Shad during the winter season
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Analysis of Occurrence:
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There has apparently been no adverse environmental impact due to the large numbers of Shad being impinged at the intake of ANO-1.. Wintertime mortality
- 1 of threadfin shad due to low temperatures is not unusual due to their lack of resistance to low water temperatures. The ANO-1 intake screens only collect the shad after they'become 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 decresise s
in population each winter and still maintain a population suitable for forage by game fish.
g The fish that were collected during sampling periods were disposed of through landfill operation. The fish that were not collected were ground in a trash grinder and returned to Lake Dardanelle.
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- 10. CORRECTIVE ACTION:
Long term' studies a'e in progress-to determine the ei acts of plant r
operation on the :\\quatic ecosystems of the Dardanelle Reservoir. Data
- l from this report. and other data obtained is fed back into these studies to determine what changes might be made to the stud:
in order to ensure that adequato data is obtained for evaluating plant i.apact.
Review by Arkansas Power 6 Light 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-ID, Rev. O Page 2 of 3
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Non-Routine, Non-Radiological Environmental Report No. 50-313/75-24 11.
Failure Data:
The ciretastances of this report are similar to those reported in Non-Routine, Non-Radiological Environmental Reports No. 50-313/75-1 through 50-313/75-23.
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Reviews and Apyroval's:
Revicued and Approved by: Plant Safety Comi:tittec Yes ( $
No ( )
Plant Superintendent Yes ( $
No ()
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Refernnec:
JWA - 893__.
Date:_?farch 3, 1975 d
E Reviwed by:
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3[p[9d-g vate:
Licensing Su crvisor Approved by:
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afet eview Ti ce g.
Approved by: A*
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Date:._7
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bEoger of thTE[ car Servico
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Approved by:. /Y/h'/hh <ZrM '/./
Date: I
$ ~ 2
/' 'D'iIector of Power.Productioii Approved by:
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Senior Vico Pt'esident 2T 9
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July 5, l'iT4 IISP-10, Ray. O Page 3 of 3 I
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