05000278/LER-1978-021, Forwards LER 78-021/01T-0

From kanterella
Jump to navigation Jump to search
Forwards LER 78-021/01T-0
ML20064F107
Person / Time
Site: Peach Bottom Constellation icon.png
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:
References
NUDOCS 7811280227
Download: ML20064F107 (2)
v • d • e


LER-1978-021, Forwards LER 78-021/01T-0
Event date:
Report date:
2781978021R00 - NRC Website
v • d • e

text

.

~

.5 i

p. (.

-~

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

's Unit 3 2

R.P.

L, betta, PA 17314.

j 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 Subsysten shall he operthie 6t h e n e v e r t he r.-

is irradiated fuel in j

3-cue reactor vessel, reactor pr" sure is ; teat er than 105 p s i r..... "

Descr_iption of the l'.v e n t :

'I 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 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 Pane 2 r. o v r u b e r.' ; s, 1"7M 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 J. he r.

Cooney Ju(

i 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

Retrieved from "https://kanterella.com/w/index.php?title=05000278/LER-1978-021,_Forwards_LER_78-021/01T-0&oldid=4443958"