05000244/LER-1979-024-01, Samples of Boric Acid Storage Tank Concentrations Found Below Min Limits.Caused by Backflow of Refueling Water Through Boric Acid Tank Outlet Motor Operated Valve

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Samples of Boric Acid Storage Tank Concentrations Found Below Min Limits.Caused by Backflow of Refueling Water Through Boric Acid Tank Outlet Motor Operated Valve
ML17261A174
Person / Time
Site: Ginna Constellation icon.png
Issue date: 02/13/1980
From: Schuler T
ROCHESTER GAS & ELECTRIC CORP.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17249A584 List:
References
LER-79-024-01X, LER-79-24-1X, NUDOCS 8002190506
Download: ML17261A174 (4)
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LER-1979-024, Samples of Boric Acid Storage Tank Concentrations Found Below Min Limits.Caused by Backflow of Refueling Water Through Boric Acid Tank Outlet Motor Operated Valve
Event date:
Report date:
2441979024R01 - NRC Website
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QB 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 EVENT DESCRIPTION AND PROBABI.E CONSEQUENCES Q10 on routine anal sis of sam les of the boric acid stora e tanks REPORT DATE 80 concentrations were found to be below the minimum 12'0 boric acid at 10. 2: and 10. 1$.

(T.S. 3. 2. 3.c).

4 This event is similar to those re orted in LER's79-009 and 79-010.

Reactor ower reduction procedures were implemented until required concentrations were achieved.

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Backflow of refuelin water throu h BA tank outlet MOV's. Initiall manual valve in BA supply line was closed, sample fre uenc increased to ever 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

Further investigation showed problem was eliminated when BA tank outlet MOV's 826 B 6 D were 3

c1osed and 8 26 A 5 C were opened.

Inspection/maintenance of these va 1ves (Aloyco 4

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10 T. Schuler NAME OF PREPARER 80 NRC USE ONI.Y 80 68 69 80 o PHDNE, 716/546-2700 Ext. 291-206

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Attachment to LER 79-024/01X-1 Rochester Gas And Electric Corporation R.E. Ginna Nuclear Power Plant, Unit No.

1 Docket No. 50-244 On December 17, 1979, at approximately 1340 hours0.0155 days <br />0.372 hours <br />0.00222 weeks <br />5.0987e-4 months <br /> the Shift Super-visor was notified of the chemical analysis which indicated that both the "A" and the "B" boric acid storage tanks contained 10.2% and 10.1% wt-%

boric acid solution respectively.

An orderly power reduction was completed at 1405 hours0.0163 days <br />0.39 hours <br />0.00232 weeks <br />5.346025e-4 months <br /> and batching operations were initiated to restore the tanks to the required specifications.

On December 19 at approximately 1015 hours0.0117 days <br />0.282 hours <br />0.00168 weeks <br />3.862075e-4 months <br /> the tanks were brought within specifications.

To ensure proper sampling and recirculation without solution stratification additional samples were taken at several elevations inside the tanks.

Analysis of all samples showed proper correlation with the normal samples.

In addition, reagents used in the sample analysis were checked and found to be proper.

To check for the possibility of back flow of reactor makeup water from the reactor makeup water storage tank through the blender and the blender boric acid supply check valve, a manual valve in the boric acid supply line was closed.

This was the same action which was taken for the event reported as LER 79-010.

The tank sampling frequency was increased to once every twelve hours.

Replacement of the suspect check valve with a more suitable style check valve and/or changing the logic of the automatic flow control valve to allow it to remain closed when not blending is currently being reviewed by the Engineering Department (EWR 2460). It was decided that until such time as a new check valve can be procured and installed and/or the logic change for the flow control valve is provided, the manual valve would remain closed, except during blending.

It was soon determined that dilution was continuing, and further invest-igation indicated leakage from the EST through one of the closed boric acid tank outlet MOVs 826A or 826C.

'Ihe outlet MOVs 826B and D were closed and the MOVs 826A 6 C were opened.

This was found to stabilize tank concentrations and indicated that the leakage had stopped.

At this point it was no longer necessary to keep the boric acid supply manual valve open, and it has been opened.

Sampling frequency has been decreased to once per day.

Inspection and any needed maintenance of the boric acid tank outlet MOVs is planned for the 1980 Annual Refueling Maintenance Shutdown.

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