ML20147E842

/03L-0 on 781107:fuel Bldg Area Radiat Monitor ORE0005 Alarmed High Due to Erroneous Readings in Control Room & Local Readouts.Caused by Failed Gm Tube;Detector Replaced

ML20147E842
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	12/07/1978
From:	Meyer B COMMONWEALTH EDISON CO.
To:
Shared Package
ML20147E840	List: ML20147E837 ML20147E842
References
LER-78-122-03L, LER-78-122-3L, NUDOCS 7812210228
Download: ML20147E842 (1)

Text

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N GC 1 O!G/ 314 U. S. NUCLI. AH Rf GULATORY COMMil.iOH (7 7n )

, y LICENSEC EVENT REPORT O i V CONTROL BLOCK: [ l l i l l o

l (PLEASE PRINT OR TYf E ALL REQUIRED INFORMATION) f~o j il !I l Ll Z l Il d 1l@! 0 l0 l -l0 l 0 l0 l 010 l- l Ol 0 l@l 45 N 4 LICLNn l1 l1i lrrLll JJ lj@l l l@

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l- U Lv til DOCK E T PJVMt;LH UJ EVENT DESCRIPTION AND PRODABLE CONSEQUENCES h

! o l :l i lThe fuel building area radiation monitor, ORE 0005, alarmed high in the 1

o ; ., ; l control room. Both the control room readout and the local readout l i o 14 j l indicated a radiation level of 20 to 30 mR/hr.A survey of the area i i o i g; l indicated a radiation level of 3 mR/hr. The monitor was taken out of l

l o l f> l service, shiftly surveys were initiated as required by Tech Spec 3.14.1.q, f iol, land a work request was initiated.There were no safety implications and l l o is l lthe health and safety of the public were not affected. l l 60 I 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONENT CODE SU8COOE SUECODE lolul

a 9 lB l Al@ $ l@ l El@ lI l N l SlT l RlU l@ l E l@ l Zl @

10 11 12 13 IH 19 20 SEQUENTI AL OCCUH R E NOC REPORT REVISION g EVENT YEAR REPORT NO. CODE TYPE NO.

@ a'g n-RO vs"Es'i l 7 l8 l l_l l1 i2 l 2 l l/l l Ol 3 l lLl l-l l0 l 21 22 23 24 16 21 23 29 M 31 32 TAK A T Of O PL T i7 HOURS 22 SB IT FO lb B. Sf i.p h MANUFA T RFR IC JJ

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di lN lg l N jg lW l 1 j2 p lg 42 43 44 47 CAUCE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l lThe erroneous readings were caused by a f ailed GM tube. The detector l

,, , , j [ Westinghouse Model No. ZP1100, was replaced. The monitor was calibrateq,

, , , ;, , ; functionally tested and retruned to service. No further action is  ;

, , , 1 L "" "" " * "Y ' I l i~i l a I i .l t 0 9 80 STA 3 i. POWE R OTHER STATUS DISCO RY CISCOVERY DESCRIPTION i i I s I l C l@ 1010 10l@l NA l l 11@l Control Room Annunciator  !

ACTIVITY CO TENT flC LE Ask D OF PELE ASE AMOUNT OF ACTIVITY 10 CATION OF HELEASE

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1 lu 11 44 PEH5JNNEL f xPOSUHES PsUMBE R TN P( DE SCHIP TION -

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Nauc os enteAni n B. A. Meyer p,nyg(312) 746-2 0 8_4_ ext. 2 51 ?

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