ML20041B404

Updated LER 81-030/03L-0:on 811211,during Testing,Degraded Voltage Relay 27A1/B25 Found W/Voltage Setpoint Outside Allowable Band.Exact Cause Unknown.Relays Recalibr & Found to Operate Correctly

ML20041B404
Person / Time
Site:	Prairie Island
Issue date:	02/12/1982
From:	Musolf D NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20041B393	List: ML20041B392 ML20041B399 ML20041B404
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8202230610
Download: ML20041B404 (1)

Text

-

.. ~=

' NnC FORu ass UPDATE REPORT - PREVIOUS REPORT DATED 011582 f (7 77)

LICENSEE EVENT REPORT CONTROL 8 LOCK: l t

l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION)

IO I18 9l l MlLICENSEE 7

Nl PlCODE IlN I 2 i@l 14 15 Ol 0l - I OLICENSE I O lNUMBER O l Ol 0l- l 0l 260 l@l 26 alLICEN51 1 l 111l TV'E Jo Il@l67 l CM $8 l@

CON'T IOl11 " ' "C , , " lL l@l0 l 5 [ 0 l 010 l 3 l 0 l 6 @l 11 211 l1 l 8 l l'l@l 0 l 2 I Il 21 8I d@

3

? 8 60 61 DOCK ET NLM8 ER 68 69 EVENT DATE 74 75 83 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo121lDuring surveillance test, degraded voltage relay 27A1/B25 was found with l 1 o l a i I a voltage setpoint outside of the allowable band. A setpoint of 90 plus or l l o I A I I minus 2 percent is specified. The as-found setpoint was 93 percent. The time l 10isl 1 delay was within the specified 6 plus or minus 2 seconds. Technical Specification ;

1016IITable TS.3.5-1 acolies. 9fmilar occurrenca renorted nn T mt 81-026. No effect l l 017 l l since other relays in logic scheme would have prevented unnecessary transfer l 1 O Ia 1 i to alternate source and initiated transfer when needed. l 7 8 9 8o C DE CODE SUSC E COMPONENT CODE SLBCODE SU E 10i91 7 8 lE l B l@ lX l@ l Z l@ l Z l Z l Zl ZlZ lZ l@ l Xl@ [Z,J @

9 to 11 12 13 18 19 20 SEQUEMTtA. OCCURRENCE REPORT REVISION

,_EVENTvEAR REPOF T NC COOE TYPE N O.

u,g

@ y"LER'ROtP l2 9822l ll l-l 23 l013l0l 24 l/l l 0l 31 l Ll l-l l 0l

_ 26 27 28 29 30 31 32 KEN A T ON ON PLANT T HOURS 22 S8 IT FO bub. SUPPLI R MAN FACTLRER l33E lgl34Xlg lZ lg 3b

[Z l@

.o l0l0l0l 3J 40 l lN lg 41 lN [g l Z lg lZ l9 l 9l 9[g 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l,(Oll Relays were recalibrated and found to operate currectly. Additional action [

tijiiI will be taken when an apparent cause is determined following further surveillancet

,,,7i  ; testing. The following causes are being considered: (1) last calibration  ;

lij3l l error, (2) unfamiliarity with time delay relay characteristics. [

Ist4II i ST2NIS  % POWER OTHE R STA TUS IS O RY DISCOVERv OESCRIPTICN Ii Is l I El@ l Il Ol Ol@l NA l l Bl@l Surveillance test l A Tivtiv CO TENT so REuAsE tOCATiON O, REuASE @

l i i s 1 l zl @O 0, REu AsrLZJ@l AMOUNT NA O, ACTiv,Tv l

@l NA l PERSOJLExPosSES ao

~u uR Tv,E DESCR,T,0N@

lt l 7* l 'l0 l 0l 0l@l Z l@l NA l

,ERsONNE'L i ,U'Z ES So Nu mR cESCR,Pr,0N@

li Is8l1010!ol@l 7 9 I1 1.'

NA l gg LOSS 08 OR Ot dAGE TO F ACILttv TV'E CESAPYtON li1,11Zi@l NA l

7 9 9 10 NRC USE CNLY i 210iSSurO l l Nl@0ESCR.

[ prionNA@ l l;;;;;;;;;;ilg e 9 i io

6. 69 .oio 8202230610 820212 D M Musolf 612-330-6764 PDR ADOCK 05000306 PHCN E - g s PDR

_