ML19326B291

Nonroutine Nonradiological Environ Rept 50-313/75-46:on 750826,sodium Nitrite Concentration Increased Across Plant Exceeding ETS Limits.Caused by Neutralizing Tank Draining in Discharge Flume During Sampling.Ets Revisions Prepared

ML19326B291
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/29/1975
From:	ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19326B289	List: ML19326B288 ML19326B291
References
NUDOCS 8004110725
Download: ML19326B291 (3)

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. 1. Non-Routine, Non-Radiological Environmental Report No. 50-313/75-46

! 2. Report Date: August 29, 1975 3. Occurrence Date: August 26, 1975

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

5. Identification of Occurrence:

Chem.ical concentration of' sodium nitrite increased across the plant in excess of Environmental Technical Specification limits.

6. Conditions Prior to Occurrence:

Steady-State Power X . Reactor Power 2388 MWth Hot Standby Net Output 786 Mwe Cold Shutdown Percent of Full Power 93 g i Refueling Shutdown Load Changes During Routine

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l Routine Startup

, Operation j Routine Shutdown Operation Other (specify) s i

7. Description of Occurrence:

Samples taken from the intake and discharge canals on 8/25/75 indicate ~2 that sodium nitrite concentration in the discharge canal was 0.01 mg/l greater than in the intake canal. ETS limit is 0.005 mg/1.

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Non-Routine, Non-Radiological Environmental Report No. 50-313/75-46

8. Designation of Apparent Cause of Occurrence:

Design Procedure Manufacture Unusual Service Condition Including Environmental Construction Component Failure Operator _

. Other (specify) x Neutralizing tank was draining into the discharge flume at time of sampling.

9. Analysis of Occurrence:

The neutralizing tank which contains water impurities remaining after regenerating condensate demineralizers and plant makeup water demin-erali:ers was being drained into the discharge flume when samples were taken. No other liquid releases were in progress at the time of sampling. 5 s

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Non-Routine, Non-Radiological Environmental Report No. 50-313/75-46 i 10. Corrective Action:

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Revisions to Environmental Technical Specifications concerning chemical

] discharges have been prepared and submitted to the NRC for approval.

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} 11. Failure Data:

The circumstances of this report are similar to those reported in Non-Routine, Non-Radiological Environmental Reports No. 50-313/75-28 through 50-313/75-45.

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