ML19351E589

LER 80-069/03L-0:on 801107,two Circulator 1D High Speed Trip Channels,One for Steam Turbine & One for Water Turbine,Found to Have Trip Points Higher than Max Allowable.Caused by Bistable Instrument Drift.Bistables Adjusted

ML19351E589
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/05/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19351E588	List: ML19351E587 ML19351E589
References
LER-80-069-03L, LER-80-69-3L, NUDOCS 8012100491
Download: ML19351E589 (1)

Text

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NRC FORM 384 U. S. NUCLEAR RE2ULATORY COMMIS$l!N

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LICENSEE EVENT REPORT CONTROL S LOCK: l i

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(PLEASE 58 MINT OR TYPE ALL REQUIRED INFORMATIONI R lClOlFlSlVl 1 l@l 0 l 01 - l 0 l 0 l LICENSE 14 15 0 l 0 NLMSER l 0 l- l 0 l 0 l@l 25 426l1 lUtCENSE 1 12TYPE l 0JQl@l$7 4AT l Sd l@ i 7 8 9 LICENSEE CODE CON'T folt1 3e,"c! l L l@l 0 l 5101010 l 216 l 7 l@l 1 11 10 l 7 l 8 l o 14@l__t 75 l ' REPORT l 0 I sQATE I R I O80l@

'  ? 8 60 61 OOCKET NUMOER 68 69 EVf NT QATE i EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h I o ( 21 l During routine surveillance testing of the helium circulator speed switches. two of I

,;3,p g the ID circulator high speed trip channels, one for the s eam turbine and one for the I gg l water turbine, were found to have trip points higher than the maximum allowable set-  !

,oi3, l points. This is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)1 ,

I o is I ! and AC 7.5.2(b)2 as operation with instrument setting less conservative than those I l o l 71 1 established by the Technical Specifications and a degraded mode of LCO 4.4-1 t

,,,,ig Table 4.4-3. Redundant systems available and operable. No accompanying occurrence. I so 7 4 a bo ettect ,ogub11c ga,lth or afety. Similar occurrence R Q -10. ,

CCDE C00f SUSCCSE CovPoNENT CODE SutCODE SUBCOCE 10191 7 8 III Blh Wh Wh l !l Nl Sl Tl Rl Ulh l Slh l Zlh 9 to ti 12 13 18 19 20 SEQUENTIAL CCCURAENCE REPORT REvtsiON LgR RO EVENT YE AR REPORT No. COCE TYPE No.

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_ 21 22 23 24 26 K N T ON C PLANT ME WOURS 58 i FOR 8. $UPP E MANUPAC RER l33E l@l34Z l@ l35Z l@ l36Z l@ 3Il0 l01010 40l J@

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

g i g o ; lThe high setpoints were due to bistable instrument drif t. The bistables were ad- l

,, ,,,l justed to the proper setpoin . J the surveillance test completed. I 11 I?!I I I

t i 121 1 It (All l 7 8 9 60 STA 4 POWER OTHER STATU$ 015 0 Y DISCQVERY CESCRIPT:ON 11 is* 't W@ l 0l 6l 0l@l'N/A " " "

l J" @l Routine" Surveillance Test 8' l

7 ACTiviTv Co'0 TENT

, RELEASEO CF RELEASE AMOUNT OF ACT viTY LCCATICN CF RELEASE l1 l6l l Z l N/A l l N/A l PER50NNEL EXPCS ES t

NUweeR TvPE cEsCRiPriCNh 11 171 l 0 ] 0 j 0 l@l Z l@l N/A l PEnseNNe'L'iNJu' lies rwsER oEsCRiPTioN@

[i{all04 i0l@l N/A 12 90 l-7 3 2 11 LCSS OF CR DAMAGE TQ FACILITY h TYPE DESCRIPTION v I1191 l Z i@l10 N/A J 7_ 9 9 50 PUst CITY NRC USE CNLY

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