05000327/LER-1980-078-03, /03L-0:on 800526,during Mode 4 Operation,Boron Concentration in RWST Measured 2124 Ppm.Caused by Boron Concentration Makeup Being Too High.Boron Diluted to Proper Concentration

/03L-0:on 800526,during Mode 4 Operation,Boron Concentration in RWST Measured 2124 Ppm.Caused by Boron Concentration Makeup Being Too High.Boron Diluted to Proper Concentration

ML19318C496
Person / Time
Site:	Sequoyah
Issue date:	06/24/1980
From:	Record D TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318C487	List: 05000327/LER-1980-078, Forwards LER 80-078/03L-0 05000327/LER-1980-078-03, /03L-0:on 800526,during Mode 4 Operation,Boron Concentration in RWST Measured 2124 Ppm.Caused by Boron Concentration Makeup Being Too High.Boron Diluted to Proper Concentration
References
LER-80-078-03L, LER-80-78-3L, NUDOCS 8007010532
Download: ML19318C496 (2)

LER-1980-078, /03L-0:on 800526,during Mode 4 Operation,Boron Concentration in RWST Measured 2124 Ppm.Caused by Boron Concentration Makeup Being Too High.Boron Diluted to Proper Concentration

Event date:
Report date:
3271980078R03 - NRC Website

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CAuSE OssCPIP9Cf4 ANO CORRECOVE ACTIONS h ITITlI Evidently while periodicallv makine un to the RWST. the boron concentrnrich iIi1I of the makeup was too high. This caused the RWST boron concentration to I g i go above the allowed limit (2100 ppm) for Mode 4.

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.3;qusyth Nucitar Pirnt LER SUPPLEMENTAL'INFORMATION SQRO-50-327/ 8078 Technical Specification Involved 3.1.2.6 Reported Under Technical Specification 6.9.1.13.b Date of Occurrence: 5/26/80. 1710 CDT Icentification and Description ot Occurrence:

The boron concentration in the RWST was measured to be 2124 ppm.

Conditions Prior to Occurrence:

Unit 1 in Mode 4 Apparent Cause of Occurrence:

Evidently, the makeup to the RWST had too high of a boron concentration.

This caused the RWST boron concentration to go a*save the allowed Mode 4 limit of 2100 ppm.

Analysis of Occurrence:

There was no danger to the health and safety oi the public.

Corrective Action

Instructed operators to reduce makeup concentration, had valve alignment -

rechecked to eliminate possi'ility of boric acid in leakage. Reviewed blending procedure for flow settings, had flow instruments checked.

Failure Data:

N/A d

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