05000318/LER-1981-022-03, /03L-0:on 810419,during Power Increase,Containment Gaseous & Particulate Radioactivity Monitoring Sys Sample Failed.Caused by Broken Motor Coupling.Motor Coupling Replaced

/03L-0:on 810419,during Power Increase,Containment Gaseous & Particulate Radioactivity Monitoring Sys Sample Failed.Caused by Broken Motor Coupling.Motor Coupling Replaced

ML20027C795
Person / Time
Site:	Calvert Cliffs
Issue date:	05/15/1981
From:	BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027C792	List: 05000318/LER-1981-022, Forwards LER 81-022/03L-0 05000318/LER-1981-022-03, /03L-0:on 810419,during Power Increase,Containment Gaseous & Particulate Radioactivity Monitoring Sys Sample Failed.Caused by Broken Motor Coupling.Motor Coupling Replaced
References
LER-81-022-03L, LER-81-22-3L, NUDOCS 8210270241
Download: ML20027C795 (2)

LER-1981-022, /03L-0:on 810419,during Power Increase,Containment Gaseous & Particulate Radioactivity Monitoring Sys Sample Failed.Caused by Broken Motor Coupling.Motor Coupling Replaced

Event date:
Report date:
3181981022R03 - NRC Website

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'S 8 t POMT C AT E 63 EVENT oESCRIPTioN ANo pro 8 ABLE CONSECUENCES o 121 i At 0315 during power increase, a.-ad Con Technician recorted the CNTitNT l

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gaseous and carticulate radioactivity samole pumo had failed (T.S. 3.4 I

oiAi l 6.1). The standby ouce was i-rediately started. However, at 0930 on l

o isi l 4-20-81 it was discovered that the c::erating sample pu=o's discharge I

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CAUSE oESCRIPTION ANo CORRECTIVE ACT1oNS 27 iioi l The RMS samole pumo failed d::e to a broken motor couoline. The couclino l

i sii l failed as a result'of excessive wear. It was reolaced and the ru: o was I

,,,,I returned to service. Comoounding the pumo failure was a faulty Py.S low I

,i3i i flow indicatinc light socket, which had a burned contact. The socket I

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DPR-69 EVENT DATE 04-19-81 REPORT DATE 05-15-81 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEOUENCES (CONT'D)

At 0815'during a powe'r increase af ter a shutdown, a Radiation Control Technician informed the Control Room Operator that the Containment Gaseous and Particulate Radioactivity Menitoring System sample pump motor coupling was broken rendering the system inoperable (T.S. 3.4.6.1).

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The standby pump was immediately placed in service. However, at 0930 on 4-20-81 it was discovered that the discharge valve on the operating sample pump was shut, again placing the Containment Caseous and. Particulate Monitors in an inoperable state. The system was immediately placed in service per Operating Instruction 35. Apoarently, when the standby pump was placed in service the operator failed to open its discharge valve as required by the operating instructions. In both Instances, the sample low flow alarm indicating light on the Radiation Monitcring System cabinet in the control room failed to indicate the lack of air sample flow. However, the Control Room Annunciating System had actuated. Radiation control technicians had obtained containment atmosphere grab samples at O!!O on 4-17-81 and again at 1015 on 4-19-81. In addition, the containment sump level alarm system was operable during the event. Therefore, adequate reactor coolant leakage detection was assured.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D) l The Control Room Radiation Monitoring System (RMS) low flow indicating light socket was found to have a burned contact, preventing light bulb indication on the RMS panel (2-RI-5280). The presence of the Control Room Annunication System alarm without the instrwnent specific alarm light caused some confusion on the part of operations personnel as to the condition that existed.

The socket (Master Specialities Series SCE) was replaced with a spare. All licensed operators have been cautioned to investigate either source of malfunction indication. All operations personnel will be informed of the details of this event.