05000324/LER-1981-083-03, Reactor Core Isolation Cooling Turbine Steam Supply Inboard Isolation Valve Closed. Caused by Spurious RCIC Isolation Logic Bus a Signal Due to Cold Solder Joint in Ambient Temp Switch.Switch Resoldered

Reactor Core Isolation Cooling Turbine Steam Supply Inboard Isolation Valve Closed. Caused by Spurious RCIC Isolation Logic Bus a Signal Due to Cold Solder Joint in Ambient Temp Switch.Switch Resoldered

ML20010H957
Person / Time
Site:	Brunswick
Issue date:	09/18/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H956	List: 05000324/LER-1981-083, Forwards Updated LER 81-083/03L-1 05000324/LER-1981-083-03, Reactor Core Isolation Cooling Turbine Steam Supply Inboard Isolation Valve Closed. Caused by Spurious RCIC Isolation Logic Bus a Signal Due to Cold Solder Joint in Ambient Temp Switch.Switch Resoldered
References
LER-81-083-03L, LER-81-83-3L, NUDOCS 8109290447
Download: ML20010H957 (1)

LER-1981-083, Reactor Core Isolation Cooling Turbine Steam Supply Inboard Isolation Valve Closed. Caused by Spurious RCIC Isolation Logic Bus a Signal Due to Cold Solder Joint in Ambient Temp Switch.Switch Resoldered

Event date:
Report date:
3241981083R03 - NRC Website

text

NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION Update Report (7-771-LICENSEE EVENT REPORT Previous Report Date 9-11-81 CONTROL BLOCK: l l

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DOCKET NUMBER 68 69 EVENT DATE F4 75 REPOR i DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES h Fol2l [During plant operation with no evoluations in progress, the RCIC System automatically l l isolated due to the receipt of a spurious RCIC isolation logic bus A rignal that l

lo la l [resulted in the closure of the RCIC turbine steam supply inboard isolation valve, l

lo l4 l l o i s i 1 -E51-F007.

Surveillance of the back panel temperature instruments revealed that tempq 2

l o 16 l lerature indicator ZE51-TS-N603A was failed downscale. At the time of this event, the l

l 0 l 7 l l HPCI System was operable. This event did not affect thehealthandsafetyofthepublje.

Technical Specifications 3.7.4, 6.9.1.9b, 3.3.2 l

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS IiloIlA cold solder icint in the module circuitry of the RCIC System steam line area ambient [

[iIii ltemperature switch, 2-E51-TS-N603A, model no. 86PTGF, caused the instrument to spike. I 121 lthen downscale and initiate an RCIC isolation on high temperature. The joint was resold lered, l

No l I i l 3 l l the module was tested and calibrated and the RCIC System was returned to service.

l reason could be determined for the failed joint, which was made by the module manufactu4er.

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