ML19095A805

Submit Abnormal Occurrence Report No. AO-S1-75-16

ML19095A805
Person / Time
Site:	Surry
Issue date:	09/05/1975
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial No. 677 LER 1975-016
Download: ML19095A805 (4)

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LICENSEE EVENT REPOPT

~ AO-Sl-75-16 CONTROL BLOCK:~

1 I I I .~ i I I (PLEASE PRINT All REQUl~E.D [NFOR1¥iATIOfJ)

LICENSEE LICENSE E\'£:'c;*

NAME LICENSE NUMBER TYPE "":~?:.

@El Lvl Al s IP Is_Ej 1°1 °1.:...1°1°1°1°1°1-1° 1° I 14 /1 1111101 7 8 9 14 15 25 26 30 REPORT REPORT CATEGORY TYPE. SOURCE DOCKET NUMBER EVENT DATE .;!?J*;:;-T Dt..TE

@El CON'T jP IO j Lu L!:_J 10 I5 IO I ~ I O 12 I 8 10 I I 01 s1212111sJ !Ol9!9l2l7[5I 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION

@]~ !During normal operation on August 22, 1975, it was noted that Channel II 6T/Tav£ I 7 8 9 80 folsl Iprotection had drifted in the nonconservative direction violating Technical Speci£-* _J 7 8 9 BO

[o!41 ~ a tion 2 . 3. The channel was placed in the trip mode. An incorrect resistance of J 7 8 9 80

[o]:fil I the hot leg resistance temperature detector (RTD) caused the instru::ient drift. A _!

7 8 9 80

&Th] !failure of the RTD was assU!!led and the installed spare RTD was placed into (con t) 1 i

7 B 8 P-r.:?.-1.~ 80 SYSTEM CAUSE COI.-\PGNe:'..-:i" COMPONENT CODE CODE COMPONE,'.'T CODE St.JrP...5'< MANUFACTURER 7

@0 11 I Al B 9 10 L!J 11 IV IA IL!Vj EIX I 12 17 IN I 43 44 lxl9j9l9J 47 w 45 CAUSE DESCRIPTION

@J~j !During the subsequent investigation a reactor coolant leak rate indicated an approxi-7 8 9 80

~ Lmate 2.5 gpm primary leak. The unit was brought to hot shutdo,..,"11. Further investiga- *{

7 B 9 80

[1 lo] Lt ion revealed that the RID ~.;ras being* sprayed vrith steam and water fron a pcccki:ng (cont Yi 7 8 9 ' 80 FAG!UTY 2.r~rn*;::iu OF STATUS  % POWER O::-H:cR STATUS EE] tu L9_19 ls I ._IN-'--/A_ _ ___. .__;;..;.NL.:A=---------------*J I

7 8 9 10 12 13 44 45 46 80 FORM OF ACTNITY CONTE!~T rn 7 8 RELEASED Iii 9

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OF RELEASE (

10 11

"' / AMOUNT OF ACTIVITY

. I 44.

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 7

fiE![o!oloJ 8 8 11 w12 I

13 N/A 80 PERSONNEL INJURIES NUMBER DESCRIPTION 7

BB8 9lol olo 11I 12 N/A 80 OFFSITE CONSEQUENCES b]oJ j N/A J 7 8 9 *80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTiON 7

fiEJ8 9L~ 10 IN/A --------------------,..--*60 J PUBLICITY.

Effi { N/A 80 7 8 9 ADDITIONAL FACTORS

[ill I The health and safety of the general public was not in any way affected. .J 7 8 9 80., .

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7 13 9 80 NAME: _ _E_._ M. Sweeney, J r . * - - - - - - - - - PHONE: (804) 357-3184 GPO ee1 *.661

EVENT DESCRIPTION (con't) service. The channel was successfully tested and returned to service. During normal operation on August 23, 1975, Channel II !:.T/T protection drifted again in the nonconservative direction. The unit was ramp~dgdown until the channel was placed in the trip mode. P..n incorrect resistance of the installed spare hot leg RTD in use at the ti.De caused the instrument drift. (AO-Sl-75-16)

~AUSE DESCRIPTION .{can't) leak on valve l-RC-55 causing incorrect ohmic characteristics. The 2 inch valve was manufactured by Rockwell-Edwards Manufacturing Company. The packing was replaced and the RTD ohmic characteristics ret;.irned to normal after the RTTI dried.

Since. the drift was caused by woisture on the r.orillal RTD rather than a failure.

as originally assumed, the r:onial RTD was reconnected and the channel succe:ss:fully tested and returned to ser~ice.

VIROIN!A ft.t:crnzc .aNo P(N,EA CCMP..~'(

Surry PO'f:f'er Sr.at:ion

'P.O. Box 315 Sm:ry

• V:irgi.n:ia 238S3

• ----*'"'"- -~-*-............ - ........- -* *-**--*--* -*::***:.-:--:~:..*:~:-August: 22., 197y-**--** ---***

1ldrector of Regulatory *Operations 210 Peachtree Stxaet,. N. Y.

Suice S18 Atlanta,. Georgia 30303 This is t:o :in£orm ,YGU by *telecQ-py of an Abn:ormal 0-ccurrence that was noted on Augwn: 22. 9 l.'975 at .Surry Nuclear Power St~ti.on.

Mi.th Unit: 1 ,operating at approxmatel.y *98 per ee.nt: p.over, it was found that one channel .of aT protectilllll wwt unconservati~e due to the. failu~e of a ~esistance ~emperature detector.

1: fi1 *.*d.-.u,.,_,,J:f' E. M. Swaeney,. Jr.

~ager

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