ML19326A519

LER 77-108/03L-0:on 771208,during Surveillance Test,Chlorine Detector AE-4863A at Chlorine Tank Car Failed to Reset Following Trip.Caused by Personnel Error.Felt Wick,Electrode & Electrolyte Replaced & Circuit Board Cleaned

ML19326A519
Person / Time
Site:	Davis Besse
Issue date:	01/05/1978
From:	Karoly D TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A488	List: ML19326A487 ML19326A519
References
LER-77-108-03L, LER-77-108-3L, NUDOCS 8002040703
Download: ML19326A519 (3)

Text

NRC FORM *.66G W.

f _ LICENSEE EVENT REPORT s

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REPCRT QATE 61 DOCKET NUMSER 63 7 8 60 EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h to12l lOn Decenber 8, 1977 at 1045 hours0.0121 days <br />0.29 hours <br />0.00173 weeks <br />3.976225e-4 months <br /> it was found that chlorine detector AE-4863A at the l It I g 77J l chlorine tank car would not reset after being tripped during a surveillance test.

g o l ,, l l vas also found that detector AE-5358A at the Control Room ventilation intake was also j I

i o ; 5 g [ defective which placed the unit in Action Statement A of Technical Specification l o is i 13.3.3.7. There was no danger to the health and safety of the public or to unit oer- l 1o17l lsonnel. The redundant detector AE-5358B was operable and the Control Room Ventilation l (NF-33-77-108) l 1o Ia i 1 System was placed in the recirculation mode after HV 5306 was closed. 80 CAUSE COMP. VALVE SYSTEM CAUSE COMPCN ENT CODE SUSCODE SUSCODE CCCE CCCE SU8 CODE lo191 7 8 l A l A l@ lB ]@ l Cl@ l Il Nl Sl Tl Rl Ul@ l E l@ l Zl@

9 10 11 12 13 18 19 20 REVISloN  !

SEcVENTIAL OCCURRENCE REPORT R EPoRT No. CoOE TYPE No.

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l26Z[@ 37 40 4 44 cAuSE DESCRIPTION AND CORRECTIVE ACTIONS f 1i t o I lHV 5306 was not initially closed due to personnel error. The cause of both failures I g3 i3; lvas construction / installation error. On AE-4863A, the felt wick. electrode and elec- I At 1500

,,,,,ltrolyte were replaced. On AE-5358A, a printed circuit board was cleaned. I I

,, ,3g l hours on December 11, 1977, both detectors were declared operable removing the unit

,i,ilfrom the Action Statement of Technical Specification 3.3.3.7. I 7 8 9 IS O RY DISCOVERY CESCRIPT1oM

'TA S %Pd.NER oTHER STATUS l

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NAuE OF aaEPARER

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- TOLEDO EDISON COMPANY I DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER Np-33-77-108

, -l i DATE OF EVENT: December 8, 1977 FACILITY: Davis-Besse Unit 1 i-IDENTITICATION OF OCCURRENCE: Control Room Normal Ventilation placed in recircula-tion mode due to chlorine detector failure Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 1118, and Load (MWE) = 380.

I Description of Occurrence: on December 8, 1977 at 1045 hours0.0121 days <br />0.29 hours <br />0.00173 weeks <br />3.976225e-4 months <br />, Surveillance Test 4

ST 5037.02, " Chlorine Detection System Functional Test", was performed. During

! the course of the test, AE-4863A, the chlorine detector at the tank car was tripped and could not be reset. This isolated the Control Room Normal Ventilation

- System. In order to utilize the larger capacity of the Normal Ventilation System, AE-4863A was jumpered out and the Control Room Normal Ventilation System was thought to have been placed in the recirculation mode at 1645 hours0.019 days <br />0.457 hours <br />0.00272 weeks <br />6.259225e-4 months <br />. However, Operations personnel failed to close HV-5036, the Control Room Outside Air Intake Damper. ,Upon further investigation, it was found that AE-5358A, the Control Room Ventilation Air Intake Chlorine Detector, was inoperable.

Cd AE-4863A, AE-535SA and their associated isolation dampers' form one chlorine detec-4 tion / Control Room Isolation System string. The redundant string consisting of detectors AE-4863B, AE-5358B and their associated isolation dampers were operable.

4 The occurrence placed the unit in Action Statement A of Technical Specification .

t 3.3.3.7.

At 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on December 8,1977, it was found that HV-5306 was open. This defeated the recirculation mode of operation, placing the unit in violation of Action State-ment A of Technical Specification 3.3.3.7 from 1645 hours0.019 days <br />0.457 hours <br />0.00272 weeks <br />6.259225e-4 months <br /> to 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on December 8, 1977. . It was not realized until the Station Review Board Meeting on January 4, 1978, that damper HV-5306 had not been initially closed on December 8 at 1645 hours0.019 days <br />0.457 hours <br />0.00272 weeks <br />6.259225e-4 months <br />.

HV-5306 was closed at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br />, placing the unit in compliance with Action State-ment A of Technical Specification 3.3.3.7.

Designation of Apoarent Cause of Occurrence: The apparent cause of damper IIV-5306 being open was operator error. .The damper should have been manually closed from the Control Room co place the Control' Room Normal Ventilation System in the recircula-tion mode at 1645 hours0.019 days <br />0.457 hours <br />0.00272 weeks <br />6.259225e-4 months <br /> on December 8,1977. Operations personnel had failed to do this. At 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on December 8, 1977, HV-3306 was found in the open position i and was immediately closed.

The apparent cause of-the failures of both AE-4863A and AE-5358A was construction /

installation error. ' AE-4863A was found to have a knock-out for an electrical connection in its electrolyte reservoir. The resulting corrosion clogged the felt

. wick and destroyed the chemical properties of the electrolyte. The printed circuit board in detector AE-535SA had some dirt on it which was believed to have prevented 1

proper operation. .

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,-NOLEDOEDISONCOMPANY l ' AVIS-BESSE UNIT ONE NUCLEAR POWER STATION -

' v UPPLEMENTAL INFORMATION FOR LER NP-33-77-108 PAGE 2 Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. The redundant chlorine detection / Control Room isolation string consisting of AE-4863B, AE-5358B and associated isolation dampers was opera-ble throughout the occurrence. The Control Room Normal Ventilation System was in the recirculation mode after HV-5306 was closed at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on December 8, 1977.

Had a chlorine leak occurred at any time, the Control Room would have been isolated by the redundant detection / isolation string.

Correcti.ve Actien: At 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on December 8,1977, upon finding damper HV-5306 in the open position, Operations personnel closed it i==ediately. .This placed the Control Room Normal Ventilation System in the recirculation mode and removed the unit from violation of Action Statement A of Technical Specification 3.3.3.7. A seminar will be held with Operations personnel to emphasize the necessity of l closing HV-5306 when placing the Control Room Normal Ventilation in the recircula-tion mode.

On detector AE-4863A, the chlorine detector at the tank car, the knock-out was re-moved from the reservoir, and the felt wick, electrode and electrolyte replaced.

It was declared operable at 1230 hours0.0142 days <br />0.342 hours <br />0.00203 weeks <br />4.68015e-4 months <br /> on December 10, 1977.

detector AE-5358A of the Control Room Ventilation Air Intake, the felt wick was eplaced and the orifice and electrode cleaned and the circuit board cleaned and inspected. At 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> on December 11, 1977, Surveillance Tests ST 5037.01,

" Chlorine Detection System Channel Calibration" and ST 5037.02, " Chlorine Detec-tion System Functional Test", were completed satisfactorily.

This proved the operability of all parts of the chlorine detection / Control Room' Iso-lation System and removed the unit from Action 3tatement A of Technical Specifica-tion 3.3.3.7.

At 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> on December 12, 1977, the Control Room Normal Ventilation System was placed in the normal mode. A work request has been issued to investigate the re-dundant detectors for stailar conditions. -

j Failure Data: A previous failure occurred in detector AE-5358B due to the con- l l nections not being tightened. See Licensee Event Report NE-33-77-31. i l

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