ML17349A303

LER 92-006-00:on 920610,discovered That Recirculation of Waste Monitor Tank,Prior to Liquid Release,Not Conducted Per TS & Tank Recirculated to Less than One Tank Vol.Caused by Overestimation of Flow Rate.Calibrs verified.W/920710 Ltr

ML17349A303
Person / Time
Site:	Turkey Point
Issue date:	07/10/1992
From:	Knorr J, Plunkett T FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-92-195, LER-92-006, LER-92-6, NUDOCS 9207200129
Download: ML17349A303 (7)

Text

ACCELERATED DISTBHBUTION DEMONSTRATION SYSTEM REGULATE INFORMATION DZSTRZBUTZOlOYSTEM (RIDE)

ACCESSION NBR.9207200129 DOC.DATE: 92/07/10 NOTARIZED: NO DOCKET FACIL:50-250 Turkey Point Plant, Unit 3, Florida Power and Light C 05000250 AUTH. NAME AUTHOR AFFILIATION KNORRFJ.E. Florida Power & Light .Co.

PLUNKETT,T.F. Florida Power 6 Light Co.

RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER 92-006-00:on 920610,discovered that recirculation of waste monitor tank, prior to liquid release,not conducted per TS s tank recirculated to less than one tank vol.Caused by overestimation of flow rate.Calibrs verified.W/920710 ltr.

DISTRIBUTION CODE: ZE22T COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER), 1ncident Rpt, etc.

NOTES:NRR RAGHAVAN,L 05000250 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA ~

1 1 PD2-2 PD 1 1 AULUCK,R 1 1 INTERNAL: ACNW 2 2 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 NRR/DET/EMEB 7E 1 1 NRR/DLPQ/LHFB10 1 1

'2 NRR/DLPQ/LPEB10 1 1 'RR/DOEA/OEAB 1 1 NRR/DREP/PRPBll 2 2 N J)ST/SELB 8D 1 1 NRR/DST/SICBSH3 1 1 gt/~DS- - - PLBSD1 1 1 NRR/DST/SRXB 8E 1 1 -ZILE 1 1 RES/DSIR/EIB 1 1 RGN2 FILE 01 1 1 EXTERNAL EGGG BRYCE F J H~ 3 3 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSIC MURPHYFG.A 1 1

~ NSIC POORE F W. 1 1 NUDOCS FULL TXT 1 1 NOTES: 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

FULL TEXT CONVERSION REQUiRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 31 ENCL 31

P.O. Box 029100, Miami, FL, 33102-9100 jUL 1 ii t9~~

L-92-195 10 CFR 50.73 U. S. Nuclear Regulator'y Commission Attn: Document Control Desk Washington, D. C. 20555 Gentlemen:

Re: Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 Reportable Event: 92-006-00 Recirculation of Waste Monitor Tanks not in Accordance With Offsite Dose Calculational Manual Prior to Sample The attached Licensee Event Report 250-92-006-00 is being provided in accordance with 10 CFR 50.73 (a) (2) (i) (B) ~

If there are any questions please contact us.

Very truly yours,

+g'j'J..... 4'-i:

T. F. Plunkett Vice President Turkey Point Nuclear TFP/JEKjjk enclosures cc: Stewart D. Ebneter, Regional Administrator, Region II, USNRC Ross C. Butcher,'Senior Resident Inspector, USNRC, Turkey Point Plant 9207200129 920710 PDR ADOCK 05000250 PDR gP aa 10$ GfaaP c>">P4a>

LXCENSEE EVENT REPORT (LER)

DOCKET NUMBER (2) PACE (3)

I'ACILITY NAYS (I)

Turkey Point Unit 3 05000250 1 OF 3 Recirculation of Waste Monitor Tanks not in Accordance With Offsite Dose Calculational Manual Prior to Sample Acquisition.

RPT DATE (I) OTHER FACILITIES INV. (6)

EVENT DATE (5) LER NUMBER (6)

DAY YR SEO ) HON DAY YR DOCKET ) (S)

MON NAME 06 10 92 92 006 00 07 10 92 Turkey Point Unit 4 05000251 OPERATINC MODE (2) 10 CFR 50.73 a 2 i 8 LICENSEE CONTACT FOR THIS LER (12)

James E. Knorr, Regulation and Compliance Specialist TELEPHONE NUMBER 305-246-6757 C0%'LETE ONE LihT FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

SYSTEM COMPOhTNT MANUFACTURER NPRDS CAUSE SYSTEM MANUFACTURER NPRDS CAUSE EXPECTED SUPPLEyLNTAL REPORT EXPECTED (16) SUBMISSION DATE (1$ )

MONTH DAY YEAR (if yee, eaetPlete EXPECTED SUBMISSION DATE)

ABSTRACT (16) e On June 10, 1992, during a Quality Assurance audit of radiological liquid releasesP Florida Power and Light personnel discovered that the recirculation of the waste monitor tank prior to liquid releases was not being conducted in the manner required by Technical Specifications.

Technical Specification 4.11.1.1.2 requires that an analysis be performed in accordance with the requirements of the Offsite Dose Calculation Manual (ODCM) . ODCM section 2.2.1 requires that liquid waste in the waste monitor tank be isolated and recirculated for a minimum of one tank volume prior to sampling. Contrary to the ODCM the tank has been recirculated for somewhat less than one tank volume.

After the discovery and further evaluation, the recirculation time was changed to conservatively conform with the Technical Specification and ODCM.

The root. cause appears to be an inadequate characterization of the pump and recirculation line capabilities and therefore overestimation of the recirculation flow rate.

LICENSEE ANT REPORT (LER) TEXT )NTINUATION FACILITY NAME DOCKET NUMBER LER NUMBER PAGE NO.

TURKEY POINT UNITS 3 & 4 05000250 92-006-00 02 0F 03 I. DESCRIPTION OF THE EVENT During an annual Quality Assurance audit of radioactive effluents, Florida Power and Light Personnel evaluated the recirculation time necessary to meet the requirements of the Offsite Dose Calculation Manual and Technical Specification 4.11.1.1.2. During the audit, flow rates and pressures existing during the recirculation process of the'waste monitor tank (EIIS WD IEEE-TK) were verified. The. system characteristics were found to be 'approximately 72 gpm at 112 psig. The flow was expected to be 85 to 100 gpm. A pump curve created to reflect the system characteristics was found to be in error. The recirculation time for the system was required to be one tank volume by Chemistry Procedure O-NCZP-061.2, "Waste Monitor Tank. Sampling." The normal recirculation time was one hour. The waste monitor tank has a volume of 5000 gallons. Therefore, less than one volume was recirculated in one hour.

II. CAUSE OF THE EVENT The root cause was the incorrect pump curve. The procedure used for the analysis of the tank volume required the tank to be recirculated for a minimum of one tank volume. The flow rate found during the audit, hour, would result in the recirculation of the equivalent of only one-half if used for one tank volume.

III. ANALYSIS OF THE EVENT Following the discovery of the flow discrepancy, chemistry personnel performed a mixing analysis of the tank concentration. The tank was allowed to settle for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. A sample was taken prior to the beginning of a mixing of the tank by recirculation as normally performed.

Further samples were taken each 15 minutes for the Waste Monitor Tank Rectrculat,ton following 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. The AUc lde Concentration vs. Tine I

graph on the right shows the result of that test L 13 00 ~ Start of fIaa2 Eectrcclatica Virtually no concentration 1E-03 ~ A'NT Rectrc after 40 hoar eett11a0 change occurred after 15 cl minutes ~

ut. Ce-137 00-58 Co-80 1E-04 6

The measurable nuclides O C

contents of the tank appear 8 1E-0S to be colloidal in nature e

'0 and reach equilibrium within 15 minutes of the 0 1E-06 beginning of the zD recirculation process.

Therefore little 1E 07 recirculation time is 13!00 13:13 13:30 13&5 'M:00 11 Lf 11:30 11:I5 13:00 13:15 13l30 TIme required to obtain a representative sample of the tank contents.

Additionally, the response history of the process radiation monitor (R-18) for this effluent streain has shown no abnormally high readings.

LICENSEE ZONT REPORT (LER) TEXT.OINTINUATION FACILITY NAME DOCKET NUMBER LER NUMBER PAGE NO.

'iE TURKEY POINT UNITS 3 & 4 '5000250 92-006-00 03 or 03 IV. CORRECTIVE ACTIONS The immediate corrective action was to double the recirculation time of the waste monitor tank volume to two hours to insure that one tank volume was turned over prior to sampling. This time was based upon the empirical data collected during the verification of the flow in the line during the recirculation process in accordance with 'ecirculation Temporary, Procedure TP-845.

2. Operating procedure 0-NCOP-003 has been revised to require logging pump discharge pressure, start time and sample time during the liquid release process. This will assure adequate recirculation time. Further investigation will be conducted on an additional recirculation line with flow indication. If adequate flow is possible through the recirculation line with flow indication, the line will be incorporated as an option in OP 5163.3 for use during tank recirculation.

lt t

3. The pressure, and flow instrument calibrations for the waste monitor tank recirculation system have been verified.

The monitor tank is also used to hold radioactive water prior to release.

The flow rate for-.recirculation of the monitor tank volume prior to obtaining a sample was verified using Temporary Procedure TP-845. The flow rate is adequate to achieve a recirculation of one tank volume in the procedurally required two hours of recirculation time.

5... Safety related pump characteristics are all tested and monitored for change and meeting analyzed acceptance criteria as part of the Inservice Testing Program.

V. ADDITIONAL INFORMATION No similar LERs have been identified.

'l