05000318/LER-1979-051-03, /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

/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: 05000318/LER-1979-051, Forwards LER 79-051/03L-0 05000318/LER-1979-051-03, /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
References
LER-79-051-03L-01, LER-79-51-3L-1, NUDOCS 8001300312
Download: ML19257C761 (2)

LER-1979-051, /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

Event date:
Report date:
3181979051R03 - NRC Website

text

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

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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

MIoIcIcINI2l@l0l0 -1010101010l-1010l@l4Il 11111 @l l@

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8 5 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT b8 CON'T 10111 3$"c' d l015 0101013Il18l@l1l2 21817 l 9 l@l 0 l 1 l 2 l S I 8 l 0 @

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8 60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 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 I ment gaseous monitor was returned to service at 1450 on 12/31/79. This is i

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7 not a repetitive occurrence.

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33 34 35 36 37 40 41 42 43 44 47 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

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Ed NAME OF PREPARER pnoye:

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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