ML20094N719

Staff Exhibit S-60,consisting of Memo Recommending That Licensees Review Facilities to Determine If Specific Terminal Blocks Used in Low Voltage Application

ML20094N719
Person / Time
Site:	Farley
Issue date:	02/20/1992
From:	Freeman M ALABAMA POWER CO.
To:
References
CIVP-S-060, CIVP-S-60, IEIN-84-47, NUDOCS 9204070049
Download: ML20094N719 (2)

Text

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!, JOSEPH M..FARLEY NUCl. EAR PLANT 0063403

/ NUCLEAR GENERATION DEPARINENT MEMORANDUM i Xhl.IL b USNhC DATE: F.sy 27 198692 N O S'.3 JECT: IE Infomation Notice (IEN) -

84-47: Environmental [ g gCa[ W Y Qualification Tests of Electrical '

Terminal Blocks y hXcq,gNGkMia'lCI FNP-86-0305 CL g b R ANM b

FROM:- M. D. Freeman 70: File IE Information Notice (IEN) 84-47 refers to the results of a recent NRC-sponsored environmental qualification methodology research It highlights a test conducted on electrical tensin+1 blocks.

potentisl concern that any exist when terminal blocks are exposed to a steam environment. The results of the test show that a moisture film will for= on the surface of the terminal' block during the simulation of ,

the loss Of Coolant Accident / Main Steam Line Bresh (LOCA/MSLB) si=ulations and that the leakage currents may be of significance in sc:e applications.

In view of the above, licensees are suggested to (1) review their facilities to deter =ine if the specific terminal blocks are used in

'or voltage applications. and (2) review terminal block qualiff cation cocument to ensure that the functional requirements and associated loop accuracy of circuits utilizing tenninal blocks will not degrade- to an.

unacceptable level due to the flow'of leakage currents that might occur dur:ng design basis events.

TNP us es States Terminal Blocks in safety-rtlated applications-re utring Environ = ental Qualification. A c m.1c $ e test report and

,;usuficction for environmental qualification of these terminal blocks is centained in the Environmental Qualiff catfwa-Manufacturers file.

Index. TN? qualification of these tenait.sl.h acks addresses leakage

. currents. It also includes consideration for accelersted aging and j

seis:ic testing as well as thCA and caustic spray testing. 'Therefore.

TNP hat. ecnfidence in' the reliability of its terminal blocks.

Baseo or the above information, no.further action is required with regard to this notice. Approximately two man-hours were expended in the research and preparation of this response.

Prepared By '.Y % - WCa J Reviewed By C. d. k d Approved By Staff Exh. 60 tj 9a04070049 920220 PDR ADOCK 0500034g O PDR

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