05000293/LER-1980-081-03, /03L-0:on 801005,during Shutdown to Perform Maint on Reactor Bldg Vent Sample Pumps Due to Repeated Blown Fuses,Flow Alarm Was Annunciating on Control Room Panel C-903.Caused by Instrument Drift.Erroneous Alarm Reset

/03L-0:on 801005,during Shutdown to Perform Maint on Reactor Bldg Vent Sample Pumps Due to Repeated Blown Fuses,Flow Alarm Was Annunciating on Control Room Panel C-903.Caused by Instrument Drift.Erroneous Alarm Reset

ML19340B892
Person / Time
Site:	Pilgrim
Issue date:	11/03/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19340B889	List: 05000293/LER-1980-081, Forwards LER 80-081/03L-0 05000293/LER-1980-081-03, /03L-0:on 801005,during Shutdown to Perform Maint on Reactor Bldg Vent Sample Pumps Due to Repeated Blown Fuses,Flow Alarm Was Annunciating on Control Room Panel C-903.Caused by Instrument Drift.Erroneous Alarm Reset
References
LER-80-081-03L, LER-80-81-3L, NUDOCS 8011120526
Download: ML19340B892 (1)

LER-1980-081, /03L-0:on 801005,during Shutdown to Perform Maint on Reactor Bldg Vent Sample Pumps Due to Repeated Blown Fuses,Flow Alarm Was Annunciating on Control Room Panel C-903.Caused by Instrument Drift.Erroneous Alarm Reset

Event date:
Report date:
2931980081R03 - NRC Website

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3 60 61 QoCxfTNLMSER 68 69 EV ENT CATE 74 75 REPORT QATE 80 EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h Iol2l l During a plant shutdown from October i to October 6, 1980 maintenance was performed on l

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the Reactor Building Vent Sample Pu=ps because of repeat.ed blown fuses experienced on i

io,,,i September 30 and October 1,1980. Upon returning the pumps to service a flow alarm l

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The R3V-PRM sa=ple pumps were j

ga g,; rebuilt, the sample line purged and the alarm system adjusted. All maintenance and g

1 lol7l l djust! Cnts were Completed and the system returned to service prior to startup.

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44 47 CAUSE DESCRIPTION AND CCARECTIVE ACTIONS h li6o} l The blown fuses were the result of moisture accumulating in the samole lines. Purcing l [i jil l the samole lines eliminated this problem. The erroneous samole flow alar, reoutred a I

,,43, j minor reset adjustment to correct. The existing alarm system is adequate to detect I

, ;3; l si=ilar problems; therefore no further corrective action is olanned.

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Mr. M. Thomas McLoughlin dd7-7M-7RbX6)

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