ML20115C715

Initial Part 21 Rept Re Abb Pneumatic Timers in Control Circuits for EDG Svc Water Pumps & Reactor Bldg Cooling Fans Exhibiting Early time-out.Significant Disagreement Exists Between Util & Vendor Over Testing Requirements

ML20115C715
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/13/1992
From:	ENTERGY OPERATIONS, INC.
To:	NRC
References
REF-PT21-92 NUDOCS 9210200052
Download: ML20115C715 (1)

Text

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• r Datn October 13, 1992 NRC Operations Center Arkansas Naclear One b$ +jset:

10CFR21 Initial Notification b v.

$ .c - A snaas Nuclear One pre;;.u.ced from ABB model ITE62-L colid state relays for

&* # use as replacements for- existing pneumatic timers in control circuits for g Emergency Cooling fans.

1;iesel Generators,. Service : Water pumps and Reactor Build.ine One purchase order favoked ANSI C37.90.1. Duri a

-Qv '- post-installation testing of the modification to the Reactor Buildi.- .

coolet fan controls, oue t4mer exhibited an early - time sut. It wai  %

returned to the manu'actures testing but tb> c mm of its failure could not be determined. ANO ret.- 1 several ether e.eieys of this model which g,s were tested by ABB. These -

es reveales that th time period for relay actuation was influenced by _ the presence Oad M .ition- ofnoise from-induc tive load evitching. Pecat.se of the un} r,aictability of the timer setpoints, 4:

tb DC syo , c'hilm i ty in the presence of relay switching that can occur ou

- the relays are timing (such as during saf-ty system on sation), a substantial safety hazard could have been created by tha '

. instr.11ed.

h argency Diesel Generstc ra being overloaded had these timing rolsys been Cooling Fan Relays controls;of this model are currently instaCed in Unit 1 RB however, this particular application 'h.m been '

evaluated am* determined not' to cause a safety - concern. There is a 4 significant disagre.ement between Ano and the vendor - over the testing -

requirements regarding naise- immunity and surge withstand capability for acceptability per the ANSI specification, s

It is AN0's position that the ABB Model ITE62-L timer relays departed from the technical requirements of a procurement document in that they faf, ad to-g A tant repecability standards s stablished in ANSr.C37.90.1. .Tha departuta

[y court!tuted a defect in that. a substantial safety hazard could have been created by installation and use of these relays. Therefore, this conoition is reportabis per 10CD21 aad apyrcpriate documentation wil.) follow.

For additional information regarding - this report, contac.t Dick Scheide at

..; 501-964-8618.

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