ML17261A163

LER 79-024/01T-0:on 791217,below Min Concentrations of Boric Acid Discovered During Routine Analysis of Samples from Boric Acid Storage Tanks.Caused by Possible Back Flow of Reactor Makeup Water Through Blender Supply Check Valve

ML17261A163
Person / Time
Site:	Ginna
Issue date:	12/28/1979
From:	Schuler T ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17249A387	List: ML17249A386 ML17261A163
References
LER-79-024-01T, LER-79-24-1T, NUDOCS 8001020500
Download: ML17261A163 (4)

Text

NRC FORM 366 U. S. NUI LCAH HCIJULA I UH Y I'LIMMISSIUITI (7-77(f 79-024/01T-'0 CONTROL BLOCK:

~ LICENSEE EVENT REPORT QI

~

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

(CAR 1331)

~01 7 8 9 NYREG1Q2000000000Q341 LICENSEE CODE I

14 15 6

LICENSE NUMBER 25 26'ICENSE 1 11QR~QE TYPE 30 57 CAT 58 LLANO CON'T

~0 7 8 soURGE 60 61 0 5 0 0 0 DOCKET NUMBER 2 4 4 07 68 69 1 2 1 7 EVENT DATE 7 9 74 QB 75 1 2 2 8 REPORT DATE 7 9 Q EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 0 2 Upon routine analysis of samples of the boric acid storage tanks, concentrations were

~03 found to be below the minimum 12% boric acid, at 10.2% and 10.1%. (T.S. 3.2.3.c)

This event is similar to those reported in LER's79-009 and 79-010. Reactor ower

~OS reduction procedures were implemented until re uired concentrations were achieved.

~06

~07

~OB 80 7 8 SYSTEM CAUSE,. CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~09 ~PC 10 Q>> E QEE ~XQ>> V A L V E X Q4 ~CQ>> ~A 20 Q'5 7 8 9 11 12 13 18 19 SEQUENTIAL OCCURRENCE REPORT REVISION Q17 LERiRO REPQRT ACTION FUTURE EVENT YEAR

~79 21 22 EFFECT

+

23 SHUTDOWN

~02 24 REPORT NO.

4 26 QW 27

~01 28 ATTACHMENT CODE 29 NPRDC TYPE

+T 30 PRIME COMP.

Q31 NO.

+0 32 COMPONENT TAKEN ACTION 33 Q1B ~A 34 Q19 ON PLANT

~BQ20 35 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS METHOD

~Q2 36 37 Q27 HOURS +22

+

40

~

SUBMITTED 41 Q23 FORM SUB.

~Q4 42 SUPPLIER

~A 43 Q25 44 MANUFACTURER R 3 4 o 47 Q26 0 Possible back flow 'of reactor makeup water through blender BA supply check valve.

Manual valve in the BA supply line was closed and sample frequency increased to every 12 hours. The check valve is a Rockwell Mfg. 1", 1500 lb. stainless steel 3 spring check valve.

4 80 8

~

7 9 FACILITY ~30 METHOD OF STATUS 9(7 POWER OTHERSTATUS DISCOVERY DISCOVERY DESCRIPTION 32 CO 1 5 F QE ~00 3 QR NA 44

~SQOE Sample analysis 80 8 9 10 12 13 45 46 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITY Q LOCATION OF RELEASE Q EIG8 LzJO 7 9 LzJQ34 10 NA 44 45 NA 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~l7 ~00 0 Q37 ~ZQ35 13 NA 80 7 8 9 11 12 PERSONNEL INJURIES NUMBER DESCRIPTIONQ41

~00 0 Q43 NA 80 7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION Q43 z Q42 NA 7 8 9 10 80 PUBLICITY NRC USE ONLY 7 8 9 10 68 69 80 o NAME OF PREPARER T. Schuler PHQNE. 716 546-2700 ext.291-206 Bool o2 EKOQ

i' Attachment to LER 79-024/01T-0 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. With this valve closed, the tank concentrations have remained constant. The tank sampling frequency has been 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). 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 will remain closed, except during blending.