ML17347A793

LER 88-010-00:on 880528,containment Ventilation & Control Room Ventilation Isolation Occurred While Containment Radiation Monitor Setpoint Being Checked.Drawer for Monitor R-11 Initiated Signals.Drawer replaced.W/880627 Ltr

ML17347A793
Person / Time
Site:	Turkey Point
Issue date:	06/27/1988
From:	Conway W, Hart R FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
L-88-271, LER-88-010, LER-88-10, NUDOCS 8807050086
Download: ML17347A793 (5)

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DEMONSTRATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8807050086 DOC.DATE: 88/06/27 NOTARIZED- NO DOCKET 5 FACIL:50-250 Turkey Point Plant, Unit 3, Florida Power and Light C 05000250 AUTH. NAME AUTHOR AFFILIATION HART,R.D. Florida Power & Light Co.

CONWAY,W.F. Florida Power & Light Co.

RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER 88-010-00:on 880528,containment ventilation & control room ventilation isolation occurred.

W/8 ltr.

DISTRIBUTION CODE L IE22D COPIES RECEIVED LTR .ENCL i 50.73 Licensee Event Report (LER), Incident Rpt, etc.

SIZE'ITLE:

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA 1 1 PD2-2 PD 1 1 EDISON,G 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DSP/NAS 1 1 AEOD/DSP/ROAB 2 2 AEOD/DSP/TPAB 1 1 D ARM/DCTS/DAB 1 1 DEDRO 1 1 I NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 I NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSB 8D 1 1 NRR/DEST/RSB 8E 1 1 NRR/DEST/SGB 8D 1 1 NRR/DLPQ/HFB 10 1 1 NRR/DLPQ/QAB 10 1 1 NRR/DOEA/EAB 1 1 1 1 NRR/DREP/RAB 10 1 1 NRR/DREP/RPB 10 2 2 NRR ~S/SIB 9A 1 1 NUDOCS-ABSTRACT 1 1 P GMXH5 02 1 1 RES TELFORD,J 1 1 RES/DE/EIB 1 1 RES/DRPS DEPY 1 1 RGN2 FILE 01 1 1 EXTERNAL: EG&G WILLIAMS,S 4 4 FORD BLDG HOY,A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 R NRC PDR 1 1 NSIC HARRIS,J 1 1 NSIC MAYS,G 1 1 I TOTAL NUMBER OF COPIES REQUIRED: LTTR 45 ENCL 44

NRD Form 388 U.S. NUCLEAR REGULATORY COMMISSION (903) APPROVED OMB NO. 31600)OC EXPIRES: 8/31/88 LICENSEE EVENT REPORT (LER)

FACILITY NAME (1) DOCKET NUMBER (2) PAGE 3 Turkey Point Unit 3 o 5 o o o 25 0 i oFO

"'" <<'I Containment Ventilation and Contro oom enti ation Iso ation W i e Containment Particulate Radiation Monitor Setpoint Was Being Checked on Two Separate Occasions EVENT DATE (5) LER NUMBER (6) REPORT DATE (7) OTHER FACILITIES INVOLVED IBI MONTH DAY YEAR YEAR cubi. SEQUENTIAL NUMBER REVISION

<Sg NUMBFR MONTH OAY YEAR FACILITYNAMES DOCKET NUMBER(SI Turkey Point Unit 4 o s o o o 251 0 5 28 88 88 0 1 0 00 06 27 0 5 0 0 0 THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR (): /Check onr or more Of thr ferro+op/ (11)

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LICENSEE CONTACT FOR THIS LER (12)

NAME TELEPHONE NUMBER AREA CODE Randall D. Hart, Licensing Engineer 30 5 246 -6 55 9 COMPLETE ONE LINE FOR EACH COMPONENT'AILURE OESCRIBEO IN THIS REPORT (13) ryk rre frxyp/

CAUSE SYSTEM COMPONENT MANUFAC.

TURER REPORTABLE TO NPRDS FOM CAUSE SYSTEM COMPONENT MANUF AC.

TURER sr Br..oN< KS. ~

X LA NN T2 60 Y .8'4i. N W%%>P: R%.;%K'UPPLEMENTAL REPORT EXPECTED (IO MONTH OAY YEAR EXPECTED SUBMISSION DATE (15)

YES Iilyes, comp/etc EXPECTED SVBM/$$ /ON DATE/ NO ABSTRACT ILimit to te00 spices, /.e., epproiimetrly fifrrrn sinple sprcr typevvnrrrn rmes/ IIBI On May 28, 1988, with Unit 3 and Unit 4 in mode 1 (power operation) the Containment Radioactive Particulate Monitor (R-ll) setpoint was being verified . The usual method of verifying the setpoint is bythepressing instrument s the High Alarm pushbutton, then reading the setpoint from digital display. As the High Alarm pushbutton was being pressed, an alarm signal was generated. This resulted in actuation of the Control Room Ventilation and Containment Ventilation Systems isolation circuitry.

The systems that were not already in their actuated position actuated s required R-ll was taken out of service and the problem investigated .

=

After troubleshooting could not find any problems, Operationscontainment requeste ed that R-ll be placed back in service to assist in monitoring activity during problems with the accordance number 1 seal leakoff on the 3A reactor coolant pump. R-11 was tested in with the normal surveillance procedure on May 30, 1988. During this test, Containment and Control Room, Ventilation Isolation signals were generated when the high alarm pushbutton was depressed. Again the systems that were not already in their actuated position actuated as designed . The drawer for R-ll was replaced . The drawer has been returned to the manufacturer for root cause analysis.

on ccompletion of the drawer replacement, R-11 was satisfactorily U pon tested and placed back in service .

8807050086 880627 PETER ADOCK 05000250 PDC (f/

NRC Form 388

NRC FIIIIII388A U.S. NUCLEAR REGULATORY COMMISSION (8 83)

UCENSEE EVENT REPORT (LER) TEXT CONTINUATION APPROVED OMB NO. 3150M104 EXPIRES: 8/31/88 FACILITY NAME u) DOCKET NUMBER (2) LER NUMBER (8) PAOE (3)

YEAR SEOVENTIAL REVISION g@ NVMSER NUMBER Turke Point Unit 3 0 s o o o 250 8 8 0 1 0 0 0 02 oF 0 3 TEXT ///meir NMCP it iPEII/ird. P44 4dd P844/H/IC Farm 38((43/ (IT)

EVENT):

On May 28, 1988, with Unit 3 at 100% power and Unit 4 at approximately 48% power the Containment Radioactive Particulate Monitor (R-11) (EIIS:IL) setpoint was being verified . The method used to verify the setpoint was pressing the High Alarm pushbutton, then reading the setpoint from the instrument s digital display. At 1345, as the High Alarm pushbutton was being pressed, an unexpected alarm signal was generated . This resulted in actuation of the Control Room Ventilation and Containment Ventilation Systems (EIIS:JM) isolation circuitry. At the time of generation of the signal the containment purge valves were closed and the control room ventilation system was out of service under a 45 day action statement per Technical Specification 3.4.7. On receipt of the signal, these systems did not actuate since they were in their design configuration . However, the instrument air bleed valves were open and they did close upon receipt of the originating signal as required .

R-ll was declared out of service and maintenance was requested to investigate the problem. The Instrument and Control Department (I&C) reopened plant work order (PWO) 7994 that had been worked on May 27, 1988 due to a filter failure light problem. The previous problem had been identified to be a loose wing nut on the filter paper take up reel . On May 29, 1988, troubleshooting was begun in accordance with general maintenance procedure O-GMI-102.1, Troubleshooting and Repair Guidelines . The journeyman performed sections 6.3, 6.4, and 6.5 of preventive maintenance procedure O-PMI-067.1, Process Radiation Monitoring System Channel R-3-11 and R-3-12 Calibration Procedure, to check the calibration of the channel circuitry. No problems were found during the calibration check.

At this time, Operations requested that R-11 be placed back in service to assist in monitoring containment activity because of problems experienced with the 3A reactor coolant pump number 1 seal leakoff flow. Operations began to place R-11 back in service by performing operating surveillance procedure (OSP) 3-0SP-067.1, Process Radiation Monitoring Operability Test, on May 30, 1988. During this test, Containment and Control Room Ventilation signals were again generated when the high alarm pushbutton was depressed . Again the systems actuated as designed .

R-11 was maintained out of service and I&C requested to continue troubleshooting.

CAUSE OF EVENT:

The drawer for R-ll was replaced . The suspect drawer has been sent back to the manufacturer for repair and root cause analysis . \

4 NRC FORM SEEA

NRC Fotm 3ddA U.S. NUCLE'AR RECULATORY COMMISSION I9 83)

LICENSEE EVENT REPORT (LER) TEXT CONTINUATION APPROVEO OMS NO. 3150-0104 EXPIRES: 8/31/88 FACILITY NAME 11) OOCKET NUMBER 12) LER NUMBER Ld) PAGE 13)

YEAR g>j SEOUENTIAL NUM8EII

'jg: REVISION

'.'UMOER Turkey Point unit 3 o s o o o 8 8 01 0 00 0 3 oF 0 3 TEXT lllmoto tottoit toqowod. oto oddidoot//Y/IC Form 3MA't/ l)T)

ANALYSIS OF EVENT:

Upon actuation of the R-11 High Alarm trip circuit, the, Containment and Control Room Ventilation Systems that were not already in their actuated position isolated per design. During this event process radiation detector R-12 (containment air gaseous detector) was operable and did not indicate any significant increases in containment activity. Both R-11 and R-12 on Unit 4 were operable during this event. The signal generated on Unit 3 did not affect any equipment on Unit 4 . No radiation releases were detected during this event .

Based on the above, the health and safety of the public were not affected.

CORRECTIVE ACTIONS:

1) After the actuation on May 28, 1988, the drawer was checked and no abnormal conditions were found.

2) The drawer for R-11 was replaced . The suspect drawer has been sent back to the manufacturer for repair and calibration. The vendor had been requested to, provide a root cause analysis report for the failure .

3) After completion of the drawer replacement, R-11 was satisfactorily tested and placed back in service .

ADDITIONAL INFORMATION:

Similar occurrences: LERs 250 87-032, 251-86-030, 250-87-005, 250-87-008, 251-87-021, 251-87-023, 251-88-002, and 250-87-30 were previous R-11 or R-12 actuations.

LER 250-88-003 reported a similar actuation of R-11 when the high alarm pushbutton was depressed. That LER was not able to pinpoint a root cause for the R-11 actuation.

Manufacturer: Nuclear Research Corp- Model Number: DRM-200.

The digital rate meter was model number DRM-200V6 and serial number RM781803.

NRC FORM 34@A ro.a1)

P OX 14000, JUNO BEACH, FL 33408.0420 ~

JUBE 2 7 1988 L-88-271 10 CFR 50.73 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 Gentlemen:

Re: Turkey Point Unit 3 and 4 Docket No. 50-250 and 50-251 Reportable Event: 250-88-10 Date of Event: May 28, 1988 Containment Ventilation and Control Room Ventilation Isolation While Containment Particulate Radiation Monitor Setpoint Was Bein Checked on Two Se grate Occasions The attached Licensee Event Report (LER) is being submitted pursuant to the requirements of 10 CFR 50.73 to provide notification of the subject event.

Very truly yours, Giis W. F. onway Seni r Vice President Nuclear WFC/SDF/gp Attachment CC: Dr. J. Nelson Grace, Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, Turkey Point Plant SDF3. LER an FPL Group company