ML20064F107

Forwards LER 78-021/01T-0

ML20064F107
Person / Time
Site:	Peach Bottom
Issue date:	11/20/1978
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20064F108	List: ML20064F107 ML20064F111
References
NUDOCS 7811280227
Download: ML20064F107 (2)

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PHILADELPHIA ELECTRIC COMPANY'  !

' 23O1 M ARKET STREET ,

.PHILADELPHI A. PA.19101' i 1285)841-4000 =

j

.oventer 20, 1971; . ;

Is r . 'i o y c e 11 . Grier. Director

! Office of Inspection asid F.nforcement R e tti o n I

latted States h u c le a r.1:e nu la t o ry Connission.

-fil Park nvenue ~~

f[;; o f P [u d s iiC'-Pqn ns y l va n ia l 9 4 P..

9 ear Mr. Gricr: 2 -

.cn -

l S Ui:J tiCT : 1_. ic e n s e ,e 1:ve n t[ Re go r t Narrative-Description ,

The f ollowin: occurrence uat, report 0'l to ?!r. I;rcenaan, 7 R e y,i o n I Office of Inupcetion an't Enforcement on N o ve;u er . 7 , -

, 1 *! 7 ( # _

+  ; --

!!c f o re nce : Docket Mu6bdr 50-270 S - '!

I i  !(e p o r t No: lAR 73-21/IT

heport Date

No ve nbe r ' 2u , .19 7 X ,

Occurrence la a t e . Novenber 6,-1978

'7 Facility: Peach 11o t t on Atomic l'ouer Station 2

's Unit 3 ,

j. R.P. L, betta, PA 17314. j  !

I i T e c h n i c.a.l.. S.p e_c_i f i c a t i o n U e.f _e..r : n c e :

. Technical Specification 3.5.C,1 r eq .a i re s that "the hPLL- t 3-Subsysten shall he operthie 6t h e n e v e r t he r.- is irradiated fuel in j cue reactor vessel, reactor pr" sure is ; teat er than 105 '

p s i r. . . . . "

Descr_iption of the l'.v e n t :  !

l- uith the unit o p e r a t i n y, at a ppro.:1 ia te ly ; 0'l percent poace a 'I feedwater cont. col systen f a i .t u r e renuited in a reactor icu icvel 't t ransient and subsequent s c ra r: . ic t h the ICIC an't !!PCI ' ue re a u tona t ica l ly iaitiated by the lov le v. i condition. .The RCIC opera ted -satis f actorily a uc de .li ve re d ra t e tt flow to the reactor  ;

vessel. The !!PCI initinted ou t fLov deIivery wa:; ' e r r a t E c '. After  !

a short pe riod of tine, the ilPCI t r ij p e d , apparentLy on ,

1 .l 7811230 M g

i r . noyce h. G ri. r

r. o v r u b e r .' ; s , 1"7M Pane 2 LCu 7J-21/IT o ve rs p ee ri . Atteopts to na nua l ly restart toe hPCL were unsuccessful until the ': P C I a u::lli a ry oli pump was ru r:o ve .: f ron service and then r e s t a r t e ri . iiPCI was then op e ra t e el aanually at rated flow until it tripped on a reactor hi;h water level s i;:n a l .

C,o n s.cft !! e_n c e_s. of Cvent:

Yhe safety signiticance of this occu rr 2nce is nininal in that sufficient l'. C C S syster.s were a va ila bic to.naintain safe reactor water level during the t ra ns ien t. The use of the ll PCI was not needed during t h i <: E rn a s ten t. The ADS, core spray, a n ct LPCI systems vere a va i la ble to de live r ua te r had the situation req u i re d a thli t iona l capacity.

Cause of Event:

The flow iastability ,r a s caused by the ll P C I clectronic

o ve r no r being out of calibration. The difficulty c

p e r i e n c e u in attenpting to nanually restart ilPCT was cause1 ') y a defective valve in the o ve r s :)ee d trip reset circuit which p re ven te d reset of the susnected overspeed trip.

.C o. r..r. e c t_i v e A.c_t i o n :

Ti e lec t ronic gove rnor was test d a n.t c a .l i b r a t e d . Proper o pe ra t i, was ve r i f ie ri . This v e t-i t' i c a t i o n included an i n s t ru n.e n t e d quick start.

The flou, speed in i li s cha rge p ressu re t ra ce s of the quick start were the sane as traces obtal,ed du rin g the pre-operational test protran. The. de f ective valve in the o ve r s p ee d trip reset circuit was repaired and the auto reset circuit functionally tested satisfcctorily.

.A_c_t i_o n to P_r__e.v_e n t. Re c u.r._r e_n_c e -

The NPCI p,o ve r no r allqunent p r o c e d u r ,,: w1Ll be reviaed to include dy nai.ic .s t a b i l i t y te s t i n :, follouine ca li bra tion.

Yours t ru ly .

f', l,1{-j yLc w Cooney JJu(. hei r.

n t e n .le n t Generatton Division-Nucleae Attachnent cc: Director, I .' H C - Office of Innpectica an! F.n f o rccue n t ir. N o r' a n i. McIler, hhC - O f f ice- of a na;;e ue n t 6 F ro:,ra r anal) sis