ML19254F278

LER 79-029/03L-0:on 790929,false High Radiation Signal Automatically Started Reactor Bldg Ventilation Sys & Standby Gas Treatment Sys.Caused by Burned Coil on Relay 1-1705-101. Relay Coil Replaced

ML19254F278
Person / Time
Site:	Quad Cities
Issue date:	10/26/1979
From:	Swales J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19254F272	List: ML19254F271 ML19254F278
References
LER-79-029-03L-03, LER-79-29-3L-3, NUDOCS 7911070463
Download: ML19254F278 (1)

Text

N4cFO3.116 U. S. NUCLE AR REGULA1 CRY CC'..*ain'ON (7 77) . ,*

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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[g"C l Ll@l 0l 5 0l 01012 5l4l@l0l9EVENT 60 61 63 03 2 19DATE l7 19 @ l 11 Ol 2l 61 71 ol @

74 75 REPORT DATE 80 DOCKET NUMBER EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h a 1 Durina steady state reactor operations, the Unit 1 Reactor Buildina ientilation I o a l System automatically isolated and the Stand-By Gas Treatment System automatically l 3 , l started from a false high high radiation signal in the Reactor Building Ventilation l g 3 System. The A Reactor Building Vent Monitor on panel 901-10 read less than 1 mrem j O e per hour, indicating that there was not an actual high radiation condition. The B i o 7 I monitor was likewise functional and indicating normally. j CI 8 9 7 80 I

SYSTEM CAUSE CAUSE COY P. VALVE CODE CODE SU9 CODE COYPONENT CODE SUSCODE SUSCCOE 7

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13 16 19 20 SEQU ENTI AL OCCURPENCE REPORT REVISION

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_ 21 22 23 24 26 27 28 29 30 31 32 1K N A CN ON PLANT HOURS SP IT FORP LB. SLPPLIE VAN FACTURER l33 Bl@l34 Zl@ l35Z l@ lZl@

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The cause of this occurrence was a burned coil on relav i-1705-101. This comOonent 1 i i failure caused the Reactor Building Ventilation System to isolate and the SBGTS to I

, , l automatically start. The monitors themselves were in fact operable- The relay coil l l was replaced and the system was functionally tested and returned to normal within thel gl Technical Specification 3 2.E.2 limit of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. SBGTSremainedrunn[ngduring l 8,Sc y pe relay replacement.

STATUS sPOweR oTHER STATUS h D

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,ISCOVERY DISCOVERY 0ESCRIPTION i s l E l@ l 0l 9 l 8 l@l NA l ] @l Operetional Event l ACTIVITY CO TENT RELFnSED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q l 8Z9 l @ l Zlgl 7 to 11 NA 44 l l 45 NA 80 l

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 7

1!78 9l0l0l0l@lZl@l NA l P RSONNE L INJURtES NUV8E R DESCRIPTION 7

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d 9 l0l0l0l@l 11 !2 NA 80 l

LOSS OF OR OAMAGE TO FACILITY TYPE DESCRIPflON NA

[ TIT8 l9 W @l 7 to 80 l

NRC USE CNLY 2 0 ISSUE @l DESCRIPTION NA 7911

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M Ave or Pncomen J. Swales pac. 309-654-2241, Ext. 173 2