ML18004B855

Special Rept:On 870523,turbine Bldg Vent Stack wide-range Gas Monitor RM-35361-1 Declared Inoperable Due to Loss of Process Flow.Caused by Shorted Sensing Element.Element & Current Card Adjusted & Calibr

ML18004B855
Person / Time
Site:	Harris
Issue date:	06/15/1987
From:	Watson R CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
HO-870449-(O), NUDOCS 8706190133
Download: ML18004B855 (4)

Text

RE>ATORY INFORMATION DISTPIB'N SYSTEM (RIDS}ACCEEEEQN NBR: 87051~0133 DQC.DATE: 87/05/15 NQTAR IZED: NQ f ACIL: 50-400 Shearon Harris Nuclear Power Plant/Unit 1/Carolina AUTH.NAME AUTHOR AFF IL IAT IQN WATSON R.A.Carolina Poeer 8.Light Co.REC IP.NAME REC IP I ENT AFF I L I AT ION Document Control Branch (Document Control Desk)DOCfhe, T 05G004GG

SUBJECT:

Special rept: on 870523 turbine bldg vent stack upside-range gas monitor 0 RM-35361-1 declared inoperable due to loss of process floe.Caused bg shorted sensing element.Element current card adjusted 5 clibr.DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR I ENCL/SIZE: TITLE: 50.73 Licensee Event Report (LER)i Incident RptA etc.NOTES: Application for permit reneeal f iled.05G00400 RECIPIENT ID CODE/NAME PD2-1 LA BUCKLEY.8 INTERNAL: ACRS MI CHELSQN AEOD/DOA AEOD/DSP/TP*D NRR/DEST/ADE NRR/DEST/CEB NRR/DEST/I CSB NRR/DEST/MTB NRR/DEST/RSB NRR/DLPG/HFB NRR/DOEA/EAB NRR/DREP/RPB NRR/PMAS/PTSB RES DEPY GI EXTERNAL: EGSG GROH, M LPDR NS IC HARR IS J COPIES LTTR ENCL 1 1 1 1 1 1 0 1 1 1 1 1 1 2 2 1 1 5, 5 1 1 REC IP IENT ID CODE/NAME PD2-1 PD ACRS MOELLER AEOD/DSP/RQAB DEDRO NRR/DEST/ADS NRR/DEST/ELB NRR/DEBT/MEB NRR/DEBT/PSB NRR/DEST/SQB NRR/DLPG/GAB NRR/DREP/R*B NR ILRB REG FILE 02 2 FILE 01 H ST LOBBY (AtARD NRC PDR NSIC MAYS~G COP IES LTTR ENCL 1 2 TOTAL NUMBER OF CQP IES REQUIRED: LTTR 42 ENCL 40 C~I 1 Carolina Power&Light Company HARRIS NUCLEAR PROJECT JUN 1 S 1S87 File Number.'SHF/10-10000 Letter Number.'O-870449 (0)United States Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 HARRIS NUCLEAR PROJECT UNIT 1 DOCKET NO.50-400 LICENSE NO.NPF-63 NRC 14-DAY SPECIAL REPORT In accordance with Technical Specifications 3.3.3.6 and 6.9.2 for the Shearon Harris Nuclear Power Plant, Unit No.1, Carolina Power&Light Company hereby submits this Special Report.This Special Report concerns the operability of a radiation monitor.Very truly yours, RAW/ONH/skm Enclosure R.A.Watson ice President Harris Nuclear Project cc.'Dr.J.N.'Grace (NRC-RII)Mr.G.Maxwell (NRC-SHNPP)

Mr.B.Buckley (NRR)87pb1901~5000400 70b1 5 pDR gDOCK 0@DR 8 MEM/HO"8704490/PAGE 1/OS1 ACCIDENT RADIATION MONITOR SPECIAL REPORT Descri tion of Event On May 23, 1987, at 1830, the Turbine Building Vent Stack Wide Range Gas Monitor (WRGM)8 RM-3536-1 was declared inoperable due to loss of process flow.This accident monitor is identified in Technical Specification Table 3.3-10 as Item 23.The compensatory actions required by Technical Specification 3.3.3.11 to allow continued effluent releases are.'1)grab sampling every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and (2)continuous sampling with auxiliary sampling equipment.

These compensatory actions were performed while the monitor was inoperable and all analysis results were within specified limits.The monitor was repaired and returned to service on June 4, 1987.The monitor was out of service for greater than 7 days;thus, a Special Report is required to be submitted per the Technical Specifications.

Cause The cause of this event was equipment failure>the inoperability of the monitor was due to a shorted flow sensing element (85)in the uKurz" system.During repair, additional problems were found with the current, profiler, and averager cards associated with the flow element, as described below.The shorted element had caused subsequent damage throughout its loop.Corrective Actions The new flow element and its associated current card were adjusted and calibrated.

The surveillance test for the equipment was run, but it failed.Troubleshooting on May 31 revealed a defective profiler card in the loop.The profiler card was replaced, and the new card was determined to also be defective.

Both the new profiler card and an averager card were repaired on June 1.The cards were re-installed on June 2.The surveillance test was successfully completed on June 3, and the monitor was declared operational on June 4, 1987.MEM/HO-8704490/PAGE 1/OS1