ML19253C956

LER 79-055/03L-0:on 791108,borated Water Vol in Boric Acid Storage Tank Fell Below Tech Spec Limit Due to Reactor Cooldown.Boric Acid Tank Concentration Was Returned to Less than 7,700 Ppm,By 771109

ML19253C956
Person / Time
Site:	Farley
Issue date:	12/07/1979
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19253C948	List: ML19253C947 ML19253C956 ML19253C978
References
LER-79-055-03L, LER-79-55-3L, NUDOCS 7912120433
Download: ML19253C956 (2)

Text

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NRC FORM .v3G (7 77.) U. S. NUCLEAR HECULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l 6

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[TITl l At 2210 on 11/8/79 makeup to the reactor coolag cjaten during a routine plant l O 3 l cooldown for maintenance (Mode 3 to 5), resulted in decreasing the,available borated l 0 4 l water volume in the Boric Acid Storage Tank (BAT) below the Tech. Spec. 3.1.2.8.a.1 l lO Isl l limit of 11,336 gallons by 442. gallons. An additional 6000 gallons of 8234 PPM boric l e s acid solution was available but it could not be considered in meeting the Tech. Spec. J o 7 l minimum due to an upper limit of 7700 PPM in the Tech. Spec. Tech. Spec. 3.1.2.8 [

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• LER 79-055/03L-0 CAUSE DESCRIPTION ANJ CORRECTIVE ACTIONS Makeup to the reactor coolant system on 11/8/79 due to the plant cooldown resulted in decreasing the B BAT level from 54%

to 50%. 52.2% level is required in a single BAT to satisfy the Tech. Spec. limit of 11,336 gallons. BAT A was unavaildble for consideration in meeting the Tech. Spec. because it contained borated water in excess of the Tech. Spec. limit of 7700 PPM due to batching that was in progress. The minimum temperature for solubility in the A BAT was not exceeded during the batching

_ operation. The A BAT concentration was returned to less than

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7700 PPM (7504) by 1050 on 11/9/79. The additional borated water source required by Tech. Spec. 3.1.2.8 (the RWST) was operable at all times during this event.

The basis for Tech. Spec. 3.1.2.8 states, in part, that the boration capability of the system is sufficient to provide a shutdown margin from expected operating conditions of 1.0% Ak/k after xenon decay and cooldown to 200"F. It should be noted that when the plant began its cooldown, the Tech. Spec. 3.1.2.8 requirements were met and therefore, bases of Tech. Spec.

3.1.2.8 were met during the cooldown.

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