ML20086K959

Telecopy AO 74-5:on 740220,RHR Relay 10A-K33A Failed to Perform Design Function in RHR Loop a Select.Caused by Dirty Contact or Foreign Dirt Particle.Contacts Cleaned & Relay Action Checked by Technician

ML20086K959
Person / Time
Site:	Peach Bottom
Issue date:	02/21/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K950	List: ML20086K946 ML20086K959
References
AO-74-5, NUDOCS 8402070090
Download: ML20086K959 (2)

Text

. .

i PHILADhlall A EUC7kl0 COMPC:'

Pench TRatfor Atomic Power Stat ,

Delt a. Pennnylvnnin .

)g h h

/

. f. k .

Tebrusry 21, 197k .

Mr. Onr.en P. O'keilly, D2 rector .

cJ/f- 3 37 -// fD Unit ed St aten Ato-ic Erarcy Cor.riction Direct ornt e of Recair. tory Operat 2or.c g Ut') -

~

631 Pnr): Avenue 1 ir.g of Prur.r.ir., Penncylvanin 19406 ,

D.:b. lee t : Abnor .1 Decurrence Pk-Unur l'otifiention Confirr.ing cy telephor.e cor.verration with Mr. 70.1 Shed}owrJ:y, A.P.C. Begior.1 Pegalntory Operntionc Office on Tebruary 21, 1974.

Referenet: 1,1cence );urber DPR 44, A'endr.ent Kurber 1, iB 7echnien1 Crecifiestion Section 4.5.A M .,

. m-

, , ,6 , -

heport )lo. : 50-277-74 .S  %;

Report Dat c :

Occurrenee Th.te:

2/21/74 2/2D/74 p[hh

/j racility: Pench Battor Atcmic Pover Stt tion - Unit 2 e3 ~- 4

h. D. is Deltn, Penney)ve.nis 1731k

. w:.. y 3dentifier. tion of Occurrence: myn.C; ISR Re19y 3DA-1;?.3.A f ailed t o perforn itc decirn functio:: in the Rw. J;.? / .*

"A" 1.coyr Se)eet locie .  ;)}.7%

,.g Conditior.c Prior to Occurrencet 1*.M.: ;

Ur,it 2 Cencrator cross Sond P30 L', Unit 2 reactor BSD W therna). u 1. 4 Pir.nt conditior.c vore atcble. vf.dQ

,3.,v-:

lveriptice of 0:currer.ce: INN Daring norr..1 rurveinence ter ting of the "A" kilk logie Sycte .. Re3ny fj.R i. i 10A-):33A $ci3(5 to tranc .it voltr.ge nerocc itc contacic and therefore up===E the loop cc)cetion 30cic sequence could not be corpleted.

Decipr. tion of Apprent Cnure of Occurrence:

'Tne reir:y c',oi) did energire, but the relay contnetc did not trar.r.it the voltr.re. A dirty contcet or n foreign dirt psrticle npprcntly ecuced the fr.D ure.

An.)ycit of Occurrence:

Tuilure of the 10A-X3% reiry to functior, vould prevent the "A" PR f Iopic from. celectinc n ) cop for injection. However, the "B" M!E 3or.ie !

vould perforr. thic function and th< refore the logic cyctem vac not h ,,

D DP*' '*

8402070090 740228 PDR ADOCK 05000277 f.'i .

i Corrective Action: S PDR y 7r,e reiny contt.cte vere cleaned and the reiny action chechcd by reloy technicinnr. After thit vork vnr. corplet ed, the reiny perforned

_ _.,,_ . c.9 t i e f n e t or D y i n t he,RHH hoop Sel e c t lor,.i c . , .

-f

l- .. ;

O O '

MEMO ROUTE SLIP 5" '" ' b a ' '"' * - """"'""- '*'"a-Form AIC-9 4 ( Res. Mai 14.19 4t p AILM n240 No'e and retura For ti tastate. { For leform ation.

TO (Name 493 WNt) thifiALS REMARR$

RO Chief, FS&EB PilILADELPilIA ELECTRIC, PB-2 RO:llQ (4)

DL (4) '

oATE A0 50-277-74-5 RO Files DR Central Files TO (Name acd uniti IMITI ALS REMARK $

OGC The above A0 is forwarded for information.

oArt Distribution will be made by this office to the

, PDR, Local PDR, NSIC, DTIE, and State 10 (Name and unit) thlilALS REMARn$

Representatives.

oATE F ROM (Name and wa.tl REMARas iN c.y p ' n .> r .

E. J. Brunner -

Region I PHONE NO. DATE 8-337-t246 3/4/74 USE OTHER $4DE FOR ADDITION AL REM ARKS cro s tain o . ges.esa i ,

j r q

s. .

9 k

$4 .

_,b

..