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

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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

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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

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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

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!. < 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 6," actual pnwer lesel.

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• +,1 via n'f Occurrence:

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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

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Qf AT A w:.* reduced as ntited above.

APR51 gains were increased to indicate f

.ati n Arnst readings.

A fo l lowup check of feedwater f1tw yk?

-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-]

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

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