ML20004D623
| ML20004D623 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 03/19/1981 |
| From: | Rizzo P, Wenderlich R BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20004D617 | List: |
| References | |
| LER-81-003-03L-01, LER-81-3-3L-1, NUDOCS 8106090591 | |
| Download: ML20004D623 (2) | |
Text
ii. m k LICENSEE EVENT REPORT
. CONTROL BLOCK: l l l l l l PLEASE PRINT OR TYPE ALL RECUIRED INFCRMATIONI l o l 3il9 l M LeCENSEE l 0 l CCODEl C l N l 1 l@15l 0LICENSE 14 l 0 lNUM8 - l J.0 l 0 l 0 l250 5260 l LICENSE
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REPORT DATE 7 8 60 61 DOCKET NUMBER ,
EVENT'oESCAIPTioN AND PROB ABLE CONSEQUENCES 01o 10121 1 Ouring power' operation at 1300, discovered that ESFAS Cnannel Z0 No.12 l In tai l Steam Generator pressure 1-E/E-1023A isolator was out of specification ;
l O 1. ] l in the non-conservative direction (T.S. 3.3.2.1). The E/E module was re- l l O i 31 ; placed, and Channel Z0 No.12 Steam Generator pressure was back in ser- l [
.IO is 1 l vice at 1630. All redundant channels remained operable during this time ;
t lOl2ll period. This event had no impact on the public health or safety. LERs l l 0 l8 ] l ~
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lil0ll Transmation Isolator (2301T) 1-E/E-1023A was found to have a non-linear- 1 i s ii i l' outout. It was replaced with a spare. The instrument would have allowed I i ,121 I one of four Steam Generator Low Pressure Block bistables to reset at I gii3 l less tnan 685 osia reouired by Technical Soecifications. Facility Chance 1 i,isi 1 30-25 will modify these isolators to increase their .eliability. I
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LER NO. 81-03/3L -
DOCKET NO. 50-317 ,
LICENSE NO. OPR-33 EV".NT DATE 02-17-81 REPORT DATE 03-19-81 '
ATTACHMENT r
CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D) ;
Transmation Isolator (Model 230lT)1-E/E-1023A was found to have a non- l linear output af ter plant operators noted a deviation among indications of [
Steam Generator #12 Pressure. .
i As found readings showed its effect on the Channel ZD No.12 Steam Generator Low Pressure Trip bistable was negligible. Hewever, in the ;
range of the No.12 Steam Generator Low Pressure Block bistable, its i
output was high such that the Channel ZD Block bistable would have reset -
approximately 13 psia below its limit.
j The blocking function is enabled by a 3 of 4 channel trip matrix and is !
removed automatically'when 2 of 4 channels are reset. Technical Specifications require the automa+ic removal of the Block (or Bypass) [
function at or above 685 psia Steam Generator Pressure, A facility change (No. 80-25) will be performed on this and similar instruments to increase their reliability. The change replaces capacitors with high failure rates with more durable components.
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