ML19320A271

Nonroutine Nonradiological Environ Rept 50-313/75-26:on 750421,samples at Intake & Discharge Show Turbidity in Discharge Canal to Be 200% Greater than Turbidity in Intake Canal.Caused by Sample Inaccuracy

ML19320A271
Person / Time
Site:	Arkansas Nuclear
Issue date:	05/06/1975
From:	ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19320A257	List: ML19320A256 ML19320A265 ML19320A271 ML19320A276
References
NUDOCS 8004210558
Download: ML19320A271 (3)

Text

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Ns _,/ 1. Non-Routine, Non-Radiological Environmental ' Report No. 50-313/75-26

2. Report Date: 5/6/75 3. Occurrence Date: 4/21/75

4. Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas

5. Identification of Oc'currenc.e:

Turbidity increase in plant circulating water exceeded Environmental Technical Sp'ecification limits per ETS 2.3.3 and ETS 4.1.1.a(4) .

6. Conditions Prior to Occurrence: --

Steady-State Power Reactor Power MWth Ibt Standby Not Output MWe Cold Shutdown X Percent of Full Power  %

Refueling Shutdown Load Changes During Routino Power Op' e ration

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Routino Startup Operation -

Routine Shutdown Operation Other (specify)

Plant shut down for maintenance.

7. Description of Occurrence:

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Sampics taken at intake and discharge show that turbidity in the discharge canal.was 200% greater that turbidity in the intake canal (intake - 10 JTU,

' discharge - 30 JTU).

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N Non-Routine, Non-Radiological Environmental Report No. 50-313/75-26 i

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8. Designation of Apparent Cause of Occurrence: ,

a Design Procedure j l

Manufacture . Unusual Service Condition Including Environmental .

l Installation / _,

Construction Component Failure ,

Operator 4 Other (specify) _

Sample inaccuracy.  !

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'9. Analysis of Occurrenec:

It is believed that sanrples taken were not truly representative of lake conditions; taerefore, occurrence is not realistic. Four circulating water pumps were running at time of sample collection and no liquid releases were in progress. No trash grinding was'in progress. ,

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A I-Non-Routine, Non-Radiological Environmental Report No. 50-313/75-26 4

10. Corrective Action:

' Turbidity and conductivity tests will be performed as soon as possible following sample collection in the future to interrogate results.

_ Questionable.results will b,e verified by resampling. In addition, testing is being done to verify sample accuracy.

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