ML17342B071

LER 87-031-00:on 871209,control Room Ventilation Isolation Occurred Due to Loss of Power to Containment Radioactive Gas Monitor.Caused by Ground in Blowdown Effluent Radiation Monitor R19.R-19 & Other Drawers cleaned.W/880106 Ltr

ML17342B071
Person / Time
Site:	Turkey Point
Issue date:	01/08/1988
From:	Salamon G, Woody C FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
L-88-7, LER-87-031, LER-87-31, NUDOCS 8801120356
Download: ML17342B071 (6)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8801120356 DOC.DATE: 88/01/08 NOTARIZED: NO DOCKET FACIL:50-250 Turkey Point Plant, Unit 3, Florida Power and Light C 05000250.-.

AUTH. NAME AUTHOR AFFILIATION SALAMON.G. Florida Power & Light Co.

WOODY,C.O. Florida Power & Light. Co.

RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER 87-031-00:on 871209,control room ventilation isolation due to loss of power to containment particulate monitor.

W/8 ltr.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR TITLE: 50.73 Licensee Event Report (LER),

~ENCL ~ SIZE:

Incident Rpt, etc.

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 McDONALD,D 1 1' INTERNAL: ACRS MICHELSON 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DS P/NAS 1 1 AEOD/DSP/ROAB 2 2 AEOD/DSP/TPAB 1 1 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEST/ADS 1 0 NRR/DEST/CEB 1 1 NRR/DEST/ELB 1 1 NRR/DEST/ICSB 1 1 NRR/DEST/MEB 3.'

NRR/DEST/MTB 1 1 NRR/DEST/PS B 1 1' NRR/DEST/RSB 1 1 NRR/DEST/SGB 1 NRR/DLPQ/HFB 1 1 NRR/DLPQ/QAB 1 1 NRR/DOEA/EAB 1. 1 NRR/DREP/RAB 1 1 NRR/DREP/RPB 2 2 NRR/DRIS/SIB 1 1 NRR/PMAS/ILRB 1 1 02 1 1 RES DEPY GI 1 1 RES TELFORD,J 1 1 RES/DE/EIB 1 1 RGN2 FILE 01 1 1 EXTERNAL: EG&G GROH/M 5 5 FORD BLDG HOY g A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRIS,J 1 1 NSIC MAYS,G 1 1 A

TOTAL NUMBER OF COPIES REQUIRED: LTTR 46 ENCL 45

N RC Form 355 UA. NUCLEAR REOULATORY COMMISSION (0 4)3)

APPROVEO OMS NO. 31500104 LICENSEE EVENT REPORT (LER) EXPIRES: S/31/SS FACILITY NAME lll DOCKET NUMBER l2) PACE 3)

Turke Point Unit 3 ontrol Room Ventilation Isolation Due to Loss of Power to Containment Particular'e 0500025010F03 JIonitor Caused by Ground in 8lowdown Effluent Radiation tIonitor EVENT DATE(5) LER NUMBER (Sl REPORT DATE (7) OTHKR FACILITIES INVOLVED (SI MONTH DAY YEAR YEAR SEQUENTIAL IIKVISION OAY YEAR FACILITYNAMES DOCKET NUMSE'R($ )

NUMbKA NUMSKII MONTH Turkey Point Unit 4 0 s o 0 0 2 5 1 1 2 0 9 8 7 8 7 0 3 1 0 001 0 8 N/A 0 5 0 0 0 THIS RKPORT IS SVSMITTED PURSUANT TO THK REQUIREMENTS OF 10 CF R $ : (Cnrcb onr or motr of tnr fotforffnFI l11).

OPERATINO MODE (5) 5 20.402(b) 20AOS(c) 50,73(a) (2) (Iv) 73.71(b)

POWER 20405( ~ l(IIIII SOM(cl(I) lb.73(aH2) (vl 73.71(c)

LEYEL 0 0 0 20.405(a) (1)(N) 50.35(c) (21 50.73(e)(2) (r(I) OTHER lSprclfy in Abtttact

'A' ' VQ below rnd In Trit. PVRC Form 20.405( ~ ) (I I (IIII 50.73(e(12) (I) lb.73(a) (2)(rSII(A) 3EEAJ 20.405(a) (I I (lr) 50 73(c)(2)(E) 50.73(a) (21(rIEI I BI 20405(c) (I ) (v) 50.73(a) (2((III) 50.73( ~ ) (2) (x I LICENSEE CONTACT FOR THIS LER l'12)

NAMK TELEPHONE NVMSER AREA COPE Gabe Salamon, Com liance En ineer 30 52 6- 656 0 COMPLETE ONE LINE FOR EACH COMPONENT FAILURK OESCRISEO IN THIS RKPORT (13)

CAUSE SYSTEM COMPONENT MANVFAC.

TURER EPORTASLE TO NPROS g( CAUSE SYSTEM COMPONENT MANUFAC.

TVRER EPORTASL

..k ............a TO NPRDS Wr4)ak:

SUPPLEMENTAL REPORT EXPECTKD (14) MONTH OAY YEAR KXPECTED SUSMISSION DATE HS)

YES flfyrt, complrtr EXPECTED SV84tlSSION OATEI X NO AssTRAcT IL/mlt to 1400 aprcrr, f A, rppnrelmrtrly ffftrrn tlnolr-corer typrwrfnrn /inrcl l15)

On December 9, 1987, with Unit 3 in Mode 5 and Unit 4 in Mode 1 at 100/

power, the Blowdown Effluent Radiation Monitor (R-19) was out of service . Maintenance to return R-19 to service was initiated . Upon removal of power from R-19, as the technician performing the maintenance began to remove R-19 s ratemeter cover, breaker 3P08 (which supplies power to the Process Radiation Monitor System (PRMS) Rack 66) tripped.

Because the Containment Radioactive Gas Monitor (R-12) is also powered from breaker 3P08, it actuate Containment and Control Room Ventilation Isolation upon a loss also lost power. R-12 is designed to of power. At 0822, the Control Room Ventilation and the Containment Ventilation System components isolated . Following the alarms, the automatic actions due to R-12 actuating were verified to have occurred and work on R-19 was halted . Breaker 3P08 was then reclosed, however tripped again. PRMS Rack 66 was cleaned and inspected . The inspection it revealed a small strand of bare wire on an internal ribbon connector in R-19 which probably caused'the power supply to short to ground as the drawer was being worked on. The proper actuation of the components required to isolate the control room and the containment was verified.

Additionally, PRMS drawers R-ll, R-12; R-14, R-17A and R-17B, and panel R-66 were cleaned'80112035(l 880108 40CK 05000.50

NRC 54IIII 3ddA U.S. NVCLEAR REGULATORY COMMISSION IS'43)

LICENSEE NT REPORT {LER) TEXT CONTINU N APPROVED OMS NO. 3150WIOd EXPIRES: S/31/ES FACILITY NAME 111 DOCKET NUMBER l3) LER NUMBER (5) PAGE 13) 5EOVENTIAI. /I+ REVI5ION

.: ~ NVM44II YEAR <N> NVM45R Turkey Point Uni t 3 o s o o o 25 08 7 031 0 0 0 20F 0 3 TEXT ///md'pdcd /I I444irrd, I/>> dddAxuM/FVRC %%dmI 3ESA3/113)

EVENT On December 9, 1987, with Unit 3 in Mode 5 and Unit 4 in Mode 1 at 100X power, the Blowdown Effluent Radiation Monitor (R-19) (EIIS:IL) was out of service (OOS).

Maintenance to return R-19 to service was initiated. Upon removal of power from R-19, the technician performing the maintenance began to remove R-19 s ratemeter cover. As the cover was being removed, breaker 3P08 (which supplies power to Process Radiation Monitor System (PRMS) Rack 66) tripped. Because the Containment Radioactive Gas Monitor (R-12) is also powered from breaker 3P08, it also lost power. R-12 is designed to actuate Containment and Ventilation Ventilation Control Room and the Isolation upon a loss of power. At 0822, the Control Room Containment Ventilation System components isolated following the trip of breaker 3P08. Following the alarms, the automatic actions due to R-12 actuating were verified to have occurred, and work on R-19 was'alted. Breaker 3P08identified, was then reclosed, however it tripped again. The cause of the actuation was and R-12 was returned to service at 1051 on December 9, 1987

'AUSE OP EVENT PRMS Rack 66 was cleaned and inspected . The inspection revealed a small strand of bare wire on an internal ribbon connector in R-19 which probably caused the power drawers in supply to short to ground as the drawer was being worked on. Several wire strand was Rack 66 were replaced recently. The cause of the presence of the inadequate housekeeping following the completion of the above modifications .

ANALYSIS OP EVENT Upon the trip of breaker 3P08, the Control Room Ventilation System isolated per design. The automatic actions required for the isolation of the Containment the Ventilation System also occurred however the containment did not isolate as containment equipment hatch was open in order to support ongoing work at that time . Based on the above, the health and safety of the public were not affected .

N/IC FORM 3dda I4a3I

NRC Form 3SEA U.S. NUCLEAR REGULATORY COMMISSION

!94)3)

LICENSEE NT REPORT (LER) TEXT CONTINU N APPROVEO OMB NO. 3150M)04 EXPIRES: 8/31/EB FACILITY NAME l(l OOCKET NUMBER (2) LER NUMBER (8) PAGE (3)

YEAR SEGVENTIAL AEYISIOII

~ IVMSSA A+V rIVMSSA Turkey Point Unit 3 o s o o o 2 5 0 8 7 031 0 0 0 3 OF 0 3 TE)/T 0'/Acre 4/reoe /4 teqe4ed, vee edcHEeAF /TRC /re/A REEE'4/ ((3)

CORRECTIVE ACTIONS

1) The proper actuation of the components required'o isolate the control room and the containment was verified .

2) The R-19 drawer was cleaned and inspected for the cause of the R-12 actuation .

3) PRMS drawers R-ll, R-12, R-14, R-17A and R-17B, and rack R-66 were also cleaned.

4Q Proc'edures will be reviewed to assure that housekeeping following modifications is addressed adequately.

ADDITIONAL INFORMATION Similar occurences: LER s 251-86-030, 250-87-005, 250-87-008, 251-87-021, 251-87-023.

HRC PGIIM SSSA o U S GPO 1988 0 824 538/455

P. O. " 14000, JUNO BEACH, F L 33408 0420 JANUARY, 8 I988.

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

Re: Turkey Point Unit 3 Docket No. 50-250 Reportable Event: 87-31 Date of Event: December 8, 1987 Control Room Ventilation Isolation Due to Loss of Power to Containment Particulate Monitor Caused by Ground in Blowdown Effluent Radiation Monitor 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, cg~

C. O. W ody pf,Executive Vice President COW/SDF/kg Attachment cc: Dr. J. Nelson Grace, Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, Turkey Point Plant SDF/018. LER g&

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