05000244/LER-1979-010-01, /01T-0 on 790420:routine Sample of Boric Acid Storage Tanks Showed Less than 12%.Reactor Power Reduction Started.Caused by Possible Backflow of Makeup Water.Check Valve Replaced

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/01T-0 on 790420:routine Sample of Boric Acid Storage Tanks Showed Less than 12%.Reactor Power Reduction Started.Caused by Possible Backflow of Makeup Water.Check Valve Replaced
ML17261A121
Person / Time
Site: Ginna Constellation icon.png
Issue date: 04/30/1979
From: Peck C
ROCHESTER GAS & ELECTRIC CORP.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17261A119 List:
References
LER-79-010-01T, LER-79-10-1T, NUDOCS 7905040191
Download: ML17261A121 (4)
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LER-1979-010, /01T-0 on 790420:routine Sample of Boric Acid Storage Tanks Showed Less than 12%.Reactor Power Reduction Started.Caused by Possible Backflow of Makeup Water.Check Valve Replaced
Event date:
Report date:
2441979010R01 - NRC Website
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U. S. NUCLEAR REGULATORYCOMMISSION NRC FORM 366 I7s77)

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Qo 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 7S REPORT DATE BB EVENT DESCRIPTION AND PROBABLE CONSEQUENCES QIO Following routine sample of boric acid stora e tanks, analysis showed less than 12%

boric acid (BA) in both tanks.

(T.B.3.2.3.c)

This event is similar to that reported in LBR 79-009.

Reactor power reduction was started.

After enriching tank contents and analysis showed above 12%, power reduction was stopped.

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OCCURRENCE REPORT REVISION LERiRO EVENT YEAR REPORT NO.

CODE TYPE NO.

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Possible back flow of reactor makeup water (RMW) through blender BA supply check valve.

Manual valve in blender BA supply line was closed and sample frequency increased to every 12 hr.

Check valve was replaced with a qualified spare.

Valve is Rockwell Manufacturing Co.

1 in. 1,300 lb. stainless steel spring check valve.

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9 FACILITY STATUS 33 POWER o

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10 12 13 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ 6

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11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION~41

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11 12 LOSS OF OR DAMAGETO FACILITYQ43 TYPE

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9 10 DISCOVERY DESCRIPTION Q32 chemical analysis LOCATIONOF RELEASE Q36 NA 7905040(9l NRC USE ONLY 68 69 80 80 80 80 80 80 80 o NAME OF PREPARER Carl H. Peck PHDNEI 7 16/546-2 700, ext. 2 9 1 -205

Attachment to LER 79-010/01T-0 Rochester Gas and Electric Corporation R. E. Ginna Nuclear Power Plant, Unit No.

1 Docket No. 50-244 On April 20, 1979 at approximately 1420 hours0.0164 days <br />0.394 hours <br />0.00235 weeks <br />5.4031e-4 months <br /> the Shift Foreman was notified of the chemical analysis which indicated that both the "A" and the "B" boric acid storage tanks contained 11.8 wt.-% boric acid solution.

An orderly load reduction was commenced, and batching operations were ini-tiated to restore the tanks to the required specifications.

The tanks were within specifications at 1710 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.50655e-4 months <br /> that day.

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.

With this valve closed the tank concentrations have remained constant.

The tank sampling frequency has been increased to once every twelve hours.

The check valve was replaced with a qualified spare.

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