ML19282B953

RO 2-79-8/10 on 790219:steady State Power Level Exceeded License Limit of 3293 Mw.Caused by Erroneous Feedwater Flow Input to Computer Causing Reactor Heat Balance to Indicate Less than Actual Power Level

ML19282B953
Person / Time
Site:	Peach Bottom
Issue date:	02/20/1979
From:	Ulrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
References
NUDOCS 7903190147
Download: ML19282B953 (2)

Text

-

$A

• W D ~6 @

ry r g Aor t rilla *-I t-CTD IC OWPAM l' e t e b. Potton A t t e- s e r<we r %t at ion Delta. Pentw s I van i a l'*311 Februa rv 20, 1979

'*r. Bo,cc fl. Cri e r nrrtec or g,:,p,ctin, nn,1 En fo rce ent n g i,. I United %t,te= Nu: Icar p egu l ato ry Cemrii = s i on e il r1rk kenne F 1 'g o f P ru s s i a , TA 19106

'WUf M : E!Tou r AP t.F. O.CU D PI N'T - FPtPfPr NTTEFICATJfW funfirreinc W. T. til l r it h 's con s e r s a t i o-i w i t h Pf r. G reenman , Pegion I, if- i e a 1 s t ne c_t Nucle 3r liegu I atit ry 'n-r i e i nn nr1 2/19/79.

94-ference. Ric' et No. 070-277/2786 re sch Hot e- fini t s 2 and 3 J a c i I i t y Ope ra t i n g Licen=c I)P R . 41

.ti a .n a r ?  !. < s . 2 79 - H / I t' O currente Date: re' rna ry 19, 1979 id e"t i f t c at i"n of Occurrence:

Yt e i.h e r re t e p ~.- r levet enreedad licen=c limit of 329; Hkt .

f.ondatient Prior to Occurrence:

l' . t h H- f t a operating r. t fu ll rswer.

• :.re"t a u s .- er riew rrnce:

r r , ,,n c e. ,- se e. ) w .. , - - t I .. inp et to <m pu'c r ca'ia d react or h-at balante e ,. i n.f i c en t e less t t6 ," actual pnwer lesel.

• +,1 '

via n'f Occurrence: ~

7 9 0 319 01V7 tenir ; w as in t c a=p le t i ng a p recor'd i t i oni ng rarp t o rated power. An electrical tani of 1"9. m c wm t edi c at ed on the p-1 ceu:' uter printout. At the *:ame rb t b - r - i i n l i c ri t e.1 tz t,z res t . rower was increased slowly unti! ':45 TM on

//IG/70 At th,t tl~ the r-1 i n.li e s t ed .T 2n 7 f fk t eind 1 112 Pos e . A check of ebe t *" n e I ciert ric.e l ,!. .inr3 tape nt n bo's t t h rit e l=- i n f i c a t *d a n electrical in,2 o f"T 121 Prae . Mien the elect ric *1 ve rsu s therrol gwr r d isc repancy wa s ro ml, t h- r - e l rein e r *a= redored inntil nn electrical inad of m : -> v i- e t 13 1012 **ir inilicra t ed on th, P-1. Af t er thi s bed been accompl}=had eh, A r o u,. reut n'ror 1.0% below rs t

• J pow e r . The Ar=st gains w e re i ne ren s e si

,t t E it r i -- v. t h a t the .indienta1 power would be 1901, at ther load. A r - - > r i -t '" of e nd t s iifu 1- eeerN,t e r f h*w s ver<ue total fee.f w s t e r flow on tha

c. put e r shtwed e d nc rera :f of about D. 4 'llb.5. /h r. This caused the thermal g ~e r < a l ibrat ion on the F-1 to read abaot 2% low and thereby inlicated.that tbc rea c t n r w :ts .s t i l l w'st b iet licensad the dal limits. Othe r than tha licensed ther-=1 I s e-i t s ni! ra re rarn-eters cf innrtan -e with reg a rd en fuel i nt eg ri t y-rtaved *.! thin limita <!uri ng the tic e that the therrtal li-it wa- e=ceeded.

Thr reu c t o r t he rr:a l. I h m i t w a s e x ceeded by less than. 21, f or a period of about' 6 hou

v w .' m w>- . . .,,- ~-

'f.r. - Q-

< < t i v t- Tction:

Qf AT A w:.* reduced as ntited above. APR51 gains were increased to indicate

.ati n Arnst readings. A fo l lowup check of feedwater f1tw fyk?

-itiers showed that 1 of t h- 3 was reading lower. The t ranssei t ter dP$M re-:eroed and adjusted t o read prope r' v. ^ Fallrwing this n P-] M6TW

,t cil neceptable enrc parancters and pcwer was increased to rated l QAgg% c 4 c'g s.'

icu. Failures:

Q@i $$

.< w' w

(*v,S -74

• W Ve ry t ruly you rs , fa%-4.r o p.s5g

?Mf

?

my.  %-7

/Y W5~ 'h "s.: e hv,lX$

W. T. tillrich , Superintendent y e%24 s Peach Ibttom Atemic Power Stat ion AM w.~.

p.> -b -

' t l' A : lj h e T;so Dip @

p*D ..i * #9 ,

% faTJ' kr..

(Q;Ng%n E x r,Av.;

y?::fT:

57. .T~~~",'s;:

,L". ' } l ,,

f:':fCl.

. - - -vars mg yppsyartsspMmeet-- -'-- _ .: meyerseem. - __

r rn7t e****** *" - *** w m**M" '

~ ,+. c~,,ni<.<aiea s ,.e.,.,ese .-,,u.<aee...e.aae...,, .....u., m. u ,

.c. . ea..re ,.......n . e u - . , a . s ., , . . n , .

r_ * ' '

,d_,

e

.9 h 4 V e si 6 s

e[ # h

, m b b t y * -

e ' a ~

_p

~

.,eg e# m 4

Y,

'e w e e 4

a