ML20011F554

LER 90-002-00:on 900127,common Control Bldg HVAC Sys Isolated & Transferred to Recirculation Mode as Result of Spurious Actuation of Chlorine Detector.Sensor Connection checked.W/900222 Ltr

ML20011F554
Person / Time
Site:	Brunswick
Issue date:	02/22/1990
From:	Harness J, Jones T CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BSEP-90-0114, BSEP-90-114, LER-90-002-01, LER-90-2-1, NUDOCS 9003060251
Download: ML20011F554 (5)

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. Carolina Power & Lighl Company ~ s:

$' LBrunswick Nuclear Project-  ;

P..'O. Box'10429- ,

Southport, NC ' 28461 0429' 4 February 22, 1990

'f4 h S/ FILE: B09-13510C. . .

.10CFR50.73 .

SERIAL: 'BSEP/90-0114 .,

' U.S'.LNuclear Regulatory' Commission ATTN: . Document Control Desk Washington, DC 20555-BRUNSWICK STEAM ELECTRIC PLANT UNIT 1 DOCKET NO. 50-325 '

LICENSE NO. DPR-71 LICENSEE EVENT REPORT'1-90-002 Gentlemen:

Iri accordance with Title 10'to the Code of Federal Regulations, the enclosed Licensee Event Report is submitted. This report fulfills the requirement for a'writton report within thirty (30) days of a reportable occurrence and is in

.accordance with the format set forth in NUREG-1022, September 1983.

, _ , Very tr)uly yours, W '

J . L . llarness, General Manager

!. Brunswick Nuclear Project p

[ TMJ/mcg Enclosure cc: Mr. S. D. Ebneter i Mr...E. G. Tourigny BSEP NRC Resident Office bec: Mr. R. M.' Coats Mr. A. M. Lucas Mr. D. C. Whitehead Mr. C. W. Crawford Mr. R. E. Morgan INPO Mr. A. B. Cutter Mr. C. M. Moseley On-Site Licensing Mr. W.'J. Dorman Mr. W. R. Murray File: DC/A-4 Ms. R. S. Gatewood Mr. J. O'Sullivan SHEEC Training Mr. W.-P. Guarino Mr. W. W. Simpson Reference Library Mr. M. D. Mill Mr. R. B. Starkey Jr.

Mr, M. A-. Jones Mr. L. V. Vagoner Mr. L. I. Loflin Ms. T. A. Ward 9003060251 900222 PDR S

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'"* l Isolation of Control Building Ventilation as a Result of a Spurious Chlorine Detector

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t At 0926 on January 27,1990, the Unit 1 and 2 common Control Building Heating, Ventilating and Air Conditioning system isolated and transferred to the recirculation mode as a result of a spurious L actaation of the Unit 2 chlorine detector, 2-X-AT-2979, when an Auxiliary Operator removed the observation window from the l

detector. Unit 1 was operating'at 100% and Unit 2 was shutdown during a scheduled refuel and maintenance outage. As a result of a discussion with the vendor, a work request has been initiated to i

verify that the connection from the sensor to the detector is not loose.

, Through past experience, the involved instrument is known to be sensitive to minor disturbances and the event is considered to be l spurious.

The event had no safety significance as the equipment operated as designed. -

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0[ 0 0l 2 0F 0 l4 Text u m a e me w. num-w a,ac s.ri asso,on EVENT Isolation. of .the Control Building Ventilation system when -an auxiliary. operator (AO) removed the front cover' of the Unit 2 chlorine detector.

MHM, COJ!pITIONS The Unit i reactor was at 100% power. The High-Pressure Coolant Injection (HPCI) (EIIS/BJ) system, Automatic Depressurization L System .(ADS) (EIIS/*), Reactor Core Isolation Cooling (RCIC)

(EIIS/BN) system, Core Spray (CS) (EIIS/BM) system and the Residual l Heat Removal / Low Pressure Coolant Injection (RHR/LPCI) (EIIS/BO) j system were operable in standby lineup.

y The Unit 2 reactor was shutdown during a scheduled refuel and 4 maintenance outage. Vessel reload had been completed on January 25, 1990, tha fuel pool gates were removed.

The common Control Building Heating, Ventilating. and ' Air l Conditioning (CB HVAC) (EIIS/NA/VI) system was aligned in the normal mode of operation. The common CB Emergency Air Filtration-

. (CBEAF)- (EIIS/VI) system was aligned in standby readiness.

EVENT DESCRIPTION While performing normal rounds in the. Service Water building on January 27, 1990, at 0926, the outside AO observed the amount of electrolyte'on'the Unit 2 chlorine detector sensor (EIIS/VI/DET)

(Wallace and Tiernan Division, Pennwalt Corp., Model 50-125 D1

, Shock Resistant Chlorine Detector). He then performed additional L equipment checks-in the building, returning to the detector within L approximately ten minutes to verify that the drop of electrolyte forming on the sensor was getting larger. The AO did not observe any apparent difference in the electrolyte drop on the sensor. To better observe the sensor and associated coating of electrolyte, the-AO removed the observation window. While removing the window the detector momentarily alarmed and immediately reset. The Ao immediately contacted the control room and informed them that he was at the detector and had apparently caused the alarm when

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OF MANAGEMENT AND 00DGET W ASHINGTON.DC 20603.

PAestify hAut (U 00COLET NUM$th (2) LIR NUM9th tS) PA04 (31 Brunswick Steam Electric Plant "*a " R$7.I'. "ATu".O Unit 1 0 l5 l0 l0 l0 l 3l2 l 5 9l0 -

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0l0 0l3 0F 0l4 varr en = . w. w ac e-muu nn removing the observation window. As a result of the alarm signal, the control room received appropriate annunciation and the control building ventilation isolated and transferred to recirculation mode as designed. The Control Operator verified that the appropriate-automatic actions had cccurred in accordance with the annunciator procedure for annunciator 2-UA-28 (6-2), CL LOADING AREA HI L CHLORINE. At 1008 the CB HVAC was returned to the normal mode in ,

accordance with Operating Procedure 37 section 8.6, Recovery of Control Poom Ventilation System After M..ing In The Rec!rculation.

Mode.

EVENT INVESTIGATION i

There were no other evolutions taking place which should have l caused this isolation. A discussion with the vendor indicated that L removal of the observation window is not expected to cause a trip i of the detector. The vendor representative suggested that the connection from the sensor to the detector may be loose. The referenced connection consists of a cable from the sensor through the window to the detector. Weekly preventative maintenance (PM) l inspections, in accordance with OPM-DET001, and past monthly l- maintenance surveillance tests (MST) (OMST-CLDET11M) indicate that L the detectors are functioning satisfactorily.

l The chlorine detectors are designed to be responsive to concentrations of chlorine gas in the atmosphere of greater than 5 parts per million. To be responsive to this amount of chlorine gas the- involved circuitry is extremely sensitive and past experience indicates that the detectors are also sensitive to minor disturbances. Similar events have been reported in the following Lens:

l _' 1-86-003, 006, 012, 016 1-88-010, 015 1-87-003, 007, 013, 022 1-89-003, 010, 022.

! ROOT CAUSE AND CORRECTIVE ACTIONJ As noted, discussion with the vendor indicates that other than the possible loose _ connection previously referenced, removal of the cover should not cause a trip. This event is considered to be a spurious actuation of the detector. Other than verifying the electrical connection, no additional corrective actions are planned. This connection will be checked under work request and job order 90-ADQW1.

NRC Form 306A (6891

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i EVENT ASSESSMENT This event had no safety significance as the equipment operated as per design. In addition, the detector will trip if the connection i between the sensor and ' detector is interrupted therefore, no, operability concern exists.

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