ML19257C761

LER 79-051/03L-0:on 791228,while Taking Log Readings, Operator Discovered Failure of Containment Gaseous Monitor. Caused by Loose Monitor Detector Cable Connector,Probably Left Unsecured After Recent Surveillance Test

ML19257C761
Person / Time
Site:	Calvert Cliffs
Issue date:	01/25/1980
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257C759	List: ML19257C758 ML19257C761
References
LER-79-051-03L-01, LER-79-51-3L-1, NUDOCS 8001300312
Download: ML19257C761 (2)

Text

NRC F ORM 366 U. S. NUCLEAR REGUL ATONY COMMISSION (7 77)

• LICENSEE EVENT REPORT CONTROL BLOCK: l 1

l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 0 i 8 5 MIoIcIcINI2l@l0l0 -1010101010l-1010l@l4IlLICENSE LICENSEE CODE 14 15 LICENSE NUMBER 25 26 11111 TYPE JO

@l57 CAT b8l@

CON'T 10111

? 8 3$"c'60d l015 0101013Il18l@l1l2 61 DOCKET NUM8ER 68 21817 69 l 9 l@l 0 l 1 l 2REPORT EVENT DATE 74 75 l SDATE I 8 l 080 @

EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 1012I At 0900 while takinc_ his log readings, an operator discovered the contairinent l0 lal gaseous monitor had failed. The monitor was placed out of service in accord- I

Ol4l l snce with T.S. 3.4.6.1. The containment air particulate monitor and the I .

1015 I I containment sump level alarm remained operable during the event. The contain- I O e I ment gaseous monitor was returned to service at 1450 on 12/31/79. This is i O 7 not a repetitive occurrence. m _ _

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"O3 80 7 8 9 DE CO E $UBC E COMPONENT CODE SUBCOdE SU DE O 9 lM Cl@ (_A1@ Lc_J@ l 11 NI Sl Tl Rl Ul@ l_XJ@ LZ_j @ _

7 8 9 to 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REV:SION LE R/RO EVENT YE AR REPORT NO. CODE TYPE N O.

@ Nug "e 17 19 I l-1 10 51 11 l_/_] lo 13 I Ll l---J l 01 21 22 23 24 26 27 28 29 30 31 32 AK N AC ONP NT MT HOURS 22 S B 1 D FOR 8. SUPPLIER

• MANUFACTURER H l@[_Z_J@ [Z_j@ IZl@ 1010 0 ul [.Y J@ LNj@ [ A__j@ IW 11 121047 l@

33 34 35 36 37 40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l The containment caseous monitor detector cable connector was found to be -

li li i i loose, causing a loss of sianal. The connector is of a detented twist-lock I .

i 2 l variety which may have been inadvertently lef t unsecured.af ter comnletion 1 i 3 I of a recently scheduled surveillance test, allowino it to loosen af ter some ',

f i 4 I time. I 7 8 9 80 -

ST  % POWER OTHERSTATUS DIS Y DISCOVERY DESCRIPTION ~

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_ l EJ@ ll Q Q@l" NA l lBl@l Operator Observation l A!TiviTY CSTENT ,

O RELEASED OF RELEASE AMOUNT OF ACTIVITY ,LOCATIO1 CORTL{ASE q i s l -

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,ERSO~~EL EoOS NUMBER TYPE DESCRIPTION 1 7 IOlOlOl@[Z_j@l NA

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PERSONNEL INJURIES -

NUM.ER OESCRi,uON@

i a 101 Ol Ol@l NA I n 7 8 9 11 12 80

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80013 o o bN 1 9 [_Z_j@l NA l 7 8 9 10 80 -

tss 2 O d@ DESCRIPTION l NA - 1 Ifililllillli?2 7 8 9 10 68 69 -

,80,3 . . j; NAME OF PREPARER S. H. Davis /P. G. Rizzo pnoye: (301)234-7942nqu - Ed

LER NO. 79-51/3L DOCKET NO. 50-318 EVENT DATE 12/28/79 REPORT DATE 01/25/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS _: (CONTINUED)

Technicians involved in radiation monitoring system maintenance have been cautioned to insure connectors in the system are securely detented when they are rejoined after maintenance.

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