ML17266A072

LER 79-015/03L-0 on 790507:surveillance Insp of RCS Boron Concentration Indicated RCS Below 1,720 Parts Per Million Tech Spec Limit.Caused by Feedwater from Steam Generator Tubes Diluting Boron Concentration.Tubes Plugged

ML17266A072
Person / Time
Site:	Saint Lucie
Issue date:	06/07/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17206A850	List: ML17206A849 ML17266A072
References
LER-79-015-03L-01, LER-79-15-3L-1, NUDOCS 7906180507
Download: ML17266A072 (2)

Text

oVRC FORoVI 366 U. S. oVVCLE*R REGULATORY COAIMISSION (7.77)

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00 cVEiolT OESCRIPTEON ANO PROSASL= CONScCVciHCES QIO 0 I 2 Ourin a refuelin outa e surveillance ins ection of RCS boron concentra-

~03 tion indicated the RCS below the 1720 m limit of T.S. 3.9.1 1698 m .

~04 The boron concentration ..in the RCS was restored to ro er concentration in

~os 135 min. No core alterations or ositive reacti.vit chan es were occurring

~06 durin the low boron concentration condition. More than adequate shutdown

~07 mar in was maintained K (0.95) throu hout this period. This is the

~08 3 9 first occurrence of. this t e.

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44 47 CAVSC OESCRIPTION ANO CORREL IVS ACTIONS Q27 o Earlier in the outa e tw steam enerator S G tubes were unknowin 1 cut during S G maintenance. When the S G was laced in wet la -uo edwater assed thru the tubes into the RCS thus dilutin the boron concentration in the RCS. The S/G and affected RC loo were drained and the S/G tubes Surveillance were ro erl lu ed.

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