ML20115C715
| 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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's
- r Datn October 13, 1992 NRC Operations Center Arkansas Naclear One b$
+jset:
10CFR21 Initial Notification b v.
$.c -
snaas Nuclear One pre;;.u.ced from ABB model ITE62-L colid state relays for A
use as replacements for-existing pneumatic timers in control circuits for Emergency 1;iesel Generators,. Service : Water pumps and Reactor Build.ine g
Cooling fans.
One purchase order favoked ANSI C37.90.1.
Duri a
-Q post-installation testing of the modification to the Reactor Buildi.-
v '-
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, c i ty in the presence of relay switching that can occur ou 4:
tb DC syo,
'hilm - the relays are timing (such as during saf-ty system on sation), a substantial safety hazard could have been created by tha
. h argency Diesel Generstc ra being overloaded had these timing rolsys been instr.11ed.
Relays of this model are currently instaCed in Unit 1 RB Cooling Fan controls; however, this particular application 'h.m been evaluated am* determined not' to cause a safety - concern.
There is a significant disagre.ement between Ano and the vendor - over the testing -
4 requirements regarding naise-immunity and surge withstand capability for acceptability per the ANSI specification, It is AN0's position that the ABB Model ITE62-L timer relays departed from s
the technical requirements of a procurement document in that they faf, ad to-g A
repecability standards s stablished in ANSr.C37.90.1..Tha departuta tant
[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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