05000282/LER-1985-001, :on 850112,in Preparation for Cooldown for Refueling,Rcs Borated to Cold Shutdown Boron Concentration & Boric Acid Tank Level Fell Below Tech Spec Min

:on 850112,in Preparation for Cooldown for Refueling,Rcs Borated to Cold Shutdown Boron Concentration & Boric Acid Tank Level Fell Below Tech Spec Min

ML20106J061
Person / Time
Site:	Prairie Island
Issue date:	02/11/1985
From:	Hunstad A, Musolf D NORTHERN STATES POWER CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-85-001, LER-85-1, NUDOCS 8502150483
Download: ML20106J061 (3)

LER-1985-001, on 850112,in Preparation for Cooldown for Refueling,Rcs Borated to Cold Shutdown Boron Concentration & Boric Acid Tank Level Fell Below Tech Spec Min

Event date:
Report date:
2821985001R00 - NRC Website

text

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In preparation for cooldown for refueling, the reactor coolant system was borated to the cold shutdown boron concentration with the contents of the boric acid tank, whose level then fell below the Tech Spec minimum of 2000 gallons. Tech Spec 1

clarification may be pursued.

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8502150483 850211 PDR ADOCK 05000282

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'esRC Poem assA LICEN EE EVENT REPORT (LER) TEXT CONTINUATION Arenovio ome o. 3ino-om EXPIRES: 0/31!96 FaceLITY esaast (16 DOCKET peutsBER (21 ggn gynagan ggg pagg g3g

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. w.- - mce asse.nm On January 12th, Unit I was at hot shutdown and preparing for cooldown for refueling. The reactor coolant system (RCS) (AB) is borated to the cold shutdown boron concentration before cooldown is begun. Boric acid for this operation is supplied from the boric acid tank (BAT) (TK). At 0400, with the RCS at cold shutdown boron ccacentration, the BAT level dropped below 2000 gallons, the Tech Spec minimum. Since boration was to continue, several hundred gallons of boric acid were added to the BAT and the level was brought well above 2000 gallons. At 0900 the RCS had been borated to the refueling shutdown boton concentration and the level again dropped below 2000 gallons and was allowed to remain there.

Though this operation was technically in violatien of Tech Specs, the reactor core was in a safer condition with the boric acid in the RCS rather than in a BAT. The boric acid inventory is maintained to mitigate the consequences of a steam line break accident. At the first time the BAT was below the Tech Spec minimum, sufficient boric acid had already been added to the RCS to mitigate the postulated accident.

There was no effect on public health and safety.

Involved personnel have reviewed this event. A Tech Spec change may be pursued to clarify the requirements for a boric acid inventory.

i pomu sesa

f a-Northem States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 Telephone (612) 330-5500 February 11, 1985 U S Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket No. 50-282 License No. DPR-42 Boric Acid Tank Inventory Allowed to be Below Tech Spec Limit The License Event Report for this occurrence is attached.

This event was reported via Emergency Notification System per 10 CFR Part 72 on January 12, 1985.

hDavidMusolf Manager - Nuclear Support Services DMM/EFE/ dab c: Regional Administrator-III, NRC NRR Project Manager, NRC Resident Inspector, NRC MPCA Attn: J W Ferman j

Attachment l

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