ML19319E609
| ML19319E609 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/22/1974 |
| From: | Reuter D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19319E601 | List: |
| References | |
| NUDOCS 8004140616 | |
| Download: ML19319E609 (3) | |
Text
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Non-Routine, Non-Radiological Environmental Report No. 50-313/74-1
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2.
Report Date:
11/22/74 3.
Occurrence Date:
11/15/74 4.
Facility:
Arkansas Nuclear One-Unit 1 '
Russellville, Arkansas S.
Identification of Occurreng:
Fish killed on intake screens exceeding 3000 pounds based on 24 hc:
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, sample I
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Conditions Prior to Occurrence:
Steady-State Power Reactor Power 0
E Hot Standby Net Output 0
MW.
Cold Shutdown Percentof Full Power 0
Refueling Shutdown Routine Startup Operation j
j Routine Shutdown Operation i
Load Changes During Routine Power Operation Other (Specifyj: All four circulating water pumps were in operati Hot shutdown condition.
7.
Description of Occurrence:
During routine fish impingement monitoring 11/15/74, using procedt 1607.10, Monitoring Fish Impinged on ANO Intake Screens, 3196 pour of fish were collected during a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period. This 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> peri was from 11:00 A.M.11/14/74 to 11:00 A.M.11/15/74. Ninety-eight and sixty five hundreths percent of these fish was a mixture of tl fin and giz:ard shad (98.65%). Other types of fish made up the rc ing 1.35%.
l 8004140flf July 5, 1974 NSP-10, Rev. O Page 1 of I
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Non-Routine, Non-Radiological, Report No. 50-313/74-1 Sheet 2 8.
Designation of Apparent Cause of Occurrence:
Design Procedure Manufacture Unusual Servico Condition Including Installation /
Environmental l-Construction
- Component Failure Operator j
. 0ther (Specify) f 1
The apparent cause was due to a decrease in water temperature from 59'F to 53*F in a three day period. This resulted in a weakening of the threadfin shad. This allowed them to become vulnerable to impingement by the intake current.
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Analysis of Occurrence:
There was no recogni::able environmental impact other than the loss of i
the above described fish.
- 10. Corrective Action:
Corrective action was taken in accordaice with procedure 1607.10. His included continuous monitoring for another 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period, n e findings of this 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period was that only 1187.5 pounds of fish were impinged.
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July 5, 1974 NSP-fD., Rev. O Page 2 of 3
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g Non-Routine, Non-Radiological Report No. 50-313/'i4-1 Sheet 3
- 11. Failure Data:
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I 12 Reviews and Approvals:
Reviewed and Approved by: Plant Safety Committee Yes %
No ( )
Plant Superintendent Yes Q9 No ( )
Reference:
Date: --
Reviewed by:.
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Date: // 2f '77
' 1.icensing Supervisor Approved by* M/d d
Date: /d 2 [ " 2 /
/
fety Review ittee a !2.f!7/
Approved by: M W
Date:
' pnager of Nuclear Servig Approved by if,']
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Date: f~~2 0 h Y Director of Power Production Approved by:
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Date: //-2.5-9/
j Senior Vice President l
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l July S, 1974 NSP-10, Rev. O Page 3 of 3
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