05000254/LER-1979-029-03, /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

/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: 05000254/LER-1979-029, Forwards LER 79-029/03L-0 05000254/LER-1979-029-03, /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
References
LER-79-029-03L-03, LER-79-29-3L-3, NUDOCS 7911070463
Download: ML19254F278 (1)

LER-1979-029, /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

Event date:
Report date:
2541979029R03 - NRC Website

text

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

LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l lh (PLE AsE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

ll lL IQ Al D 1 l@l 0 l 0 l 0 l - l 0 l 0 l 0 0

0 l 0 l@l 4 1l 1l 1l 1l@l l

l@

o 7

8 9 LICENSEE COCE 14 5

LICENSE NWSER M

26 LICENSE TN PE J0 57 GAT 53 CON'T [g"C l Ll@l 0l 5 0l 01012 5l4l@l0l9 2 19 l7 19 @ l 11 Ol 2l 61 71 ol @

o i

?

8 60 61 DOCKET NUMBER 63 03 EVENT DATE 74 75 REPORT DATE 80 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

l started from a false high high radiation signal in the Reactor Building Ventilation l

3 System. The A Reactor Building Vent Monitor on panel 901-10 read less than 1 mrem j

g 3

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 I

7 8 9 80 SYSTEM

CAUSE

CAUSE COY P.

VALVE CODE CODE SU9 CODE COYPONENT CODE SUSCODE SUSCCOE lB lB l@ l E @

A l@ l Rl El Ll Al Yl Xlh W@ l Z l@

o 0

7 8

9 to 11 12 13 16 19 20 SEQU ENTI AL OCCURPENCE REPORT REVISION

,,,, EVENT YE AR REPORT NO.

CODE TYPE N O.

O ;LER AO I7l9l l-l l0l2l9l l/l l013l lLl l-l l0l El, ;

_ 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 l Bl@l Zl@

l Z l@

lZl@

l 010 0 0l J@

Y l@

l N l@

lG 0l8l0l@

33 34 35 36 37 40 41 42 43 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,S y pe relay replacement.

h

,ISCOVERY c

,7sco e, STATUS sPOweR oTHER STATUS D

DISCOVERY 0ESCRIPTION l E l@ l 0l 9 l 8 l@l NA l ] @l Operetional Event l

i s ACTIVITY CO TENT RELFnSED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q l Z l @ l Zlgl NA l

l NA l

7 8 9 to 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

1!7 l0l0l0l@lZl@l NA l

7 8 9 P RSONNE L INJURtES NUV8E R

DESCRIPTION

i l0l0l0l@l NA l

7 d 9 11

!2 80 LOSS OF OR OAMAGE TO FACILITY TYPE DESCRIPflON

[ TIT l W @l NA l

7 8 9 to 80 ISSUE @l DESCRIPTION @

7911 070 % }

NRC USE CNLY t

NA llllllll 1l l l; 2 0 i

8 9 10 68 69 JJ. &

J. Swales 309-654-2241, Ext. 173 2

M Ave or Pncomen pac.