ML20024C499

Advises of 790111 Engineering Dept Meeting to Generate Specific Proposals to Correct Underlying Causes of Recent Incident

ML20024C499
Person / Time
Site:	Crane, Rancho Seco
Issue date:	01/08/1979
From:	Womack E BABCOCK & WILCOX CO.
To:	Taylor J BABCOCK & WILCOX CO.
References
TASK-03, TASK-3, TASK-GB GPU-0257, GPU-257, NUDOCS 8307120703
Download: ML20024C499 (16)

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JAN 9 1979 mm 3. Isn

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As. ached is a package of =sterial yee seat :o D1ck Kosina and he is ret'arsing to 7ee

.I througa se at your requeet. I have added, for your infer =ation, a requess I ande la

• I a stallar veta shortly af ter coming to Flaac Desigs.

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1 This besias to leek like Herniana's faasus example of the essaecies fi

= La which every seeler executive. Lacludias the CI3, Laev that tae company's second rate advertising vse i, :

their top pro' les, bue could met sees to de anyding of *ective until. as outsider gave e

them a push.

Last Friday, the Rancho.5eco leas:ar sustained a second overtseling 1:cident s1=1lar Lg to the ese that took place early la 1973. 'Je prod 4ced :ve thick valuaes of esaluation en the effects el the earlier incidant. Su. so far as 1 kasw. we have =et produced any of*ective recesr.endations and fellow-through ca corrective ac:ian for the underlytas 3

causes.

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i Dee's Zagineering Departaeas staff 2 fee:1=g on *hursday. January 11, offers.an espertual:7 far aa41sg specific proposals to correct this situation. I would he glad to co= para

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j ideas en this subject with you before that meettsg if you have ta=e.

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Charles Shapiro CSR Nyle ReportingInc. 5[fy(gj ir C'

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Reference:

Me=o, 3. C. Culberson =c' 31s :ibe:i:=. Sa=a

• i Subj ect. da:ed.Iuly 27, 1978 1

3ased en our discussi=n las: veek.1 undars:a d tha: yc= vill put together a s=all group of key designe:s :o reviev the 3Y 3 rapid 1

cooldovs ::ansians and brains==== wha: could have been d::e c whs:

1 could he d=ne in the Its ::53/;1an: tasign :: : duce the likelih: d 2

or 112.1: :he consequences of such an even: in :.e fu:::e. As we

!E disev.ssed. I believe that events such as this and the Oavis-Eassa 1

[J hievdcun c=ntain i=p= :an: feedback f:: us regardis ::: desi;=s.

I was pleased to lea: : hat you had already ccadu :a;d a :eview of this even: and =ade sever:1 of the :sce==enda:1:.s which vere ce -

g ai=ed in the refe:sace

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believe :he "brai=s:c = session sh:uld have :he bj ee:ive =f

[y identifybg any additional follev-c us :n take beyond the opera:iscal an;d opera:::which =ay ha a;;;=;;ia:e fer 3

ahing rece==en -

Sii da:1.ns =ade in :he reference. I sugges: a brief ;:sse::a:i = sf i-g

he even: by. ce Kelly== kick-off the discussi:

a.d re::es: th::

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he findings which resul: f := :he' discussi n ha vri::e= up, :s..

allev foll:v-us th = ugh the nor=:1 11:.c =:: age :::. I v:uld sug.

t ges: a li=i:ed' g: cup, your choice of partici please,5-chde Dick Kosiha a..d perhaps Paul Par ene. pss:s. hu:

' =1 1 believe ve =ay !bd by :c l

NjI cidents and c era:i==41 ;; 'gula: review c! seri:us :; era:i='; in.

• .a=s whi:n have ic::=a sericus 'a::susa of : heir frequ;e=cy in eur plan:s :ha:' feedback resu' ting in a :::s

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D. C Culberson - Le!e87 SeTwice M61D les 44s.4 Cast.

Ceasee I. II. 4 I:I, :gg.1 & 2. C.ys*4 21m fil' M8 333-3.1.3.5.7.3*

Ac h, TIce er Raf. p a g4, ;3,3,g Seej.

Cate 5"'3 Aapid Coeldass Transient July 27.1973 gn

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'i C. D. Aussell i

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.j C. T. Fairhars L C. Lukas

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Cs F. arch 20,1973, 2anche sees experienced a severs ther=.a1 transteet initiated j

by the loss of electrical power to a subs:aatial portion of the ::ca-I*eclear 3

sstrunastasias C:::*). De loss of power directly caused the less of Castrol 4

2een indicatiaa of =any plant parameters, the loss of taput of these parase:ers to the plaat computer, and er;eneous impu: sigt.als (=idrarge. =sro, er other.

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wise 1:aarrect) to the Integrated Canarsi Systes (ICS).

y' a S e plaa tesponse was est the usual ::assient is that the ::3 responded g;

to the erroneous input sig=als rather than actual plant conditions, a=d q

resulted in a Reactor F:stec: ion Sys:a= (725) ::1p on high pressure.

J Subsequest :s the Reactor trip, the erroneous sig=als to :he ICS cont:1buted 1]

is,de:er=ining the true status of some of the plaat para =sters and is eme: 3111=g to the rapid coeldova of the AC3. Plant operators had ez::ets difficul:y j

the plaat because of the erroneous indicatiens is the Con::a1 Room.

An investigatics of :he avesta followiss this loss of ;over ;aints out a eed for a c. lose lao's at operator ::s.inics and es:crge:cy opera:1:3 ;;sesd tres a:

all si:es for any loss of m power (or porti=n : hereof). The follevi=g g

rece;.zenda:14:s ars = ads ta adsure ;reper operatar actica for events of this g

na ture.

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1) Cperators should he ::s1=ed :s recasti:s a loss of ;ever to all or a sa*erity of their ::::'I (e.g.. indicate:s fail :s 14- ::;e. auta=s:1:

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=anual transfer to at:ernate instrummet s::ings het=gs :s respcsse).

.li, 2e loss of power is ensnasized hers :sths: chas the failure of any

't"{4 ans iss:r::=es: or control signal which are adequately covered is our cur:est si=ulats: traising 'scurses.

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C::,1hers:s to *.istributii:n

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July 27, 1973

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1) C1vus that das a;arator can deter:fr.e that electrical ;over has been lost to all er part s,f tha :. :*., he should *enew the locaties of the power supply breakers, and have a procedure available to guidly regain Power.

3) If the famic cannet he cleared (i.e., the breders es 28 ;over supplias reopen), the operater should have' a list of altersate i=.strucestation available to him, and he should he thoroughly traised is 1.s use.

Emaaples are a)' ESTAS pesals h) IFS panels e) EC1 d) SEC1

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e) Eaasta shutdown panels

'I f) 1 seal sagee j

g) Flaat computer 4

i

4) Reseg=.1 zing that ne procedure can cover a*1 possnia cor.hisations of MC j

failures, the operator's response should ha keyed to contain variables.

If the operator realizes cat he has as tastrv=entaties ;rthles (as 3

p.

l eppesed to a LCCA er steaa lhe breAh, for eXa=ple), he can ""#1 the j

trans*rst by centre 111:3 a few critical varishles:

de a) Pressurizer level (via M71 or normal Makeup Pu=ps) j, b) ICS pressure (via Pressurizar heaters, spray, elm relief valves, etc.)

.)

c) Steam Generator level (via feed flow, feedvater valves, etc.)

tg d): Steam Generator pressur,e (via turhiae bypass systes)

kii, The pressuriser level and KCS pressure assure that the Zeactor Caelant Systes ia filled; de Steam Ceneratar level and pressure assure adequate decay heat resevel.

q Attachants 1 and 2 are provided to give a brief description of de events fj, following cis loss of I':I pcver at ?.:ncho Seco. As can he seen.by this transient 5

pro =pt precise eparator action and the.;3111*y :o re ag:i:o a loss of M:*

p;at

,ever are critica fauers h 11=ith.: 2, so,,1:y of a tssie= sua as i

this.

l.!S tw

'tj Please review :his $1:a Mstruction (a=d a: tach _ents) a..d trass=1: this

,,m infor=ation ta ths cate:ar.

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C*h w/attachner.c J4 J. T. Janis J.' 1. 3 char

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3. A. Karrasch V. A. Cahh (J

J. A. Ryan T.1. Tahland tj X. V. '.hka I'. T. Zyas i.

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- VTNC FCR ACC*JRACy ENG.r:t E?::.Gygg i

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".*. c! 20. 137'!

e (Ravision 1, 5/25/73)

TIME N*

4:25:35

- Lost 1.*NI power supply cabi=ets.5,5, a 7

- This caused a 1 css of valid signals to the 2C3. 37: li=its =as bac.k feedvater, resul.ing is a partial ics:

of foodwater (act=si ?x p ver was 72%).

i g:cha$le cpening of "3" t::bine bypass

.I valves to the es:danser (*'-Mg c=certain).

s.

A 4:25:44

- React== trip es high ;; essure, tu= hine trip

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3 2

3

- pressuri:s: c=de relief setting was 's.ncun

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• • to be 'l=v (app cai=ately 2:25 psig).

T..e elect== ati: relief was isslated due G:

Q to p cvious lea:< age ;: hle=s.

he data.

n iz}dicates pri=a / pressure went *2400

'E Rsig =gs.c=4e relief valve.lidted.

,=

- ICS closes mais cent::1 and start-up feed. valves and driva =ais feed p==ps to

~ -4 '-u= speed folleving trip.

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- Ddcay ' heat and F.C pus;s energy *:e=cval acec=plished th: ugh genera:= s by inventory ly 3-.

boil off and.he additi== cf =ain fsedvater.

a 4:26:15

.- Preissuri::: c=de relief valve restats at h

app;cxi=stely 21:0 psig.

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- Cperat : sts :.s 3?: ; :=p

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4:23:22

- Cperat= st:ps HP: pu=p "3*.

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= CTSc.*3* p c=sure ::::hes 425 psig set-p::.nt ll:-

of st::= Lice.F:llurc

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- CTSC "3* Sees dry.

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4:34:25

'RC Pressure =13c0 y=1 4:37:16

, STAS actuatica 'at 1600 psig 8

I Thi's starts 1:7, I,7: and initiates

" emergency feed.

.e e=e:ges=y. 7 pu=p 5

.i is started and the hypazz e=e:ge==y 7.f

• valves are cpened to full c;en pcsitica.

The systa= =:'tes no au:==atic attemps to. control stec= generater wate: level.

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4:40

- RC pressure at 1475 psig.

It starts

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= 5280F.

ave n

'A' EP: pu=p secured.

4:43:56 m:,

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J-46:03

- LP: secured.

E 4:49:54 "A" HPI initiated.

7:c= this point ca. the operator started and st=p; eld H7: pu=ps as necessary to =aissai: ;:essurize level.

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"4:50

- Stes= Line 7:llure :.cgic clcses :03-cent :11ed start-up feed val.es to eaca C 20 whos as ur correspendia; C7sc ;; essure falls helev 425 psig.

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-3 4:51:25

- secur.ed F.C7-0 (T

=4:5*F) ave l

dd This reduced 17.07's to three 1

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4:57:27

- C;sc "A" vate: level - 53*.7*

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speculate that =: ft. ef tubes are n=t hp:

floeded (at ::p) due = s:c:= :. ins i

a angc= cat.

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.M 11 f00CQ

- }tourly'ce=put:: 1:q ;; int-cut O

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. steam temp. JSC T (C7SC "3*)

stes= p:c:su:= in ;:ig-(c sc s')

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= 230 t t..;,

hacu=ing : ave = : sat avo a.,

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I 32570 5 5 2 I.

F 15 [930 s)

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Po c: =csto:cc *to ::::: cr.bi..c:= 5,3,a7 i

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= 235*T ave RCS P: essure *2000 psig j

Both CTSC full level ranges pegged hfgh I-Cperater begins to reduca RC pressure using pressuri:== spray.

4 i

ICS closes turbine bypsss *.*alves to ccada.ser.

Cperator steps e=c:gency 7*,7 ficw.

=,:j Cperator steps mais 2*f pumps.

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,7,Jyj POWER GENERATION GROUP

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i Engineering cepartment Section Managers j

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O. M. Roy, Manager IPG3 Engineering

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Ode Avatta4111ty of 31W Plaats Novester 20. 1973 i

As all of you are M1y aware, the availabil'ity record of cur opersti5g units -

l is the poorest in the industry. ?!any of you are very heavily involved in g~ '

helping to carrect this situation. I mink you would be interestad in the attached letter from W. M. Vannoy to 1 M. Favret undersesring the sense of urgency which we asst contim.e ta maintate with respect to tais proelen.

~

! encourage each ofToe to cantinue ts wort diligently and c=ccerate fully with Frank Fahland in getting tais proeles turned around so that cur avatlantlity record can he pointae to as indicative of our ensudt=ent := esca11ence.

nanas, E

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J. H. MacMillas

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L. M. FAVRIT. VIC3 i'RESIDUT OUIJl'Id' 3

NUCLEAR DIVISICNS 1

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W W. H. VANNCY. EXECUTIVE VIC2 FRESIC D I fils Is.

e 99 4040 9

- tsa PCWEA CINEM7 ION G2 CUP

,,ter,

• I AVAILA3!!.!TY OF 34 t PLANTS nate CCTC3ZR S,1573 4

Cur availability is the worst is the industry. :te con:Inve to have the same problems with reacter c=olas:

We talk of 90% availability for NSS by 1980.pu=ps, sesis, CRC.'.t's, etc.

We appear :s be giving li hird facts! p service to this objective. What is going to be done -

R E g O,;,4

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aj a f or J:::t 10/15/73

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M QCs 2 tc78 Yeluse i " M er la September 19, 1973 PL/.'t? CP ?.ATI:3 CPGII?I*4 August 1978 ITeh - Gross f;33 Avail Unit Ca;acity3 Last Las:

Aueus.

Total 1 s..., + 12 w.

Cum 2 a,- e 12 Mc4 Cum 2 o

Ocnnee 495,300 24,550,450 24 75 72 73 65 60 Ocnnee-2 387.02:

12,$25,2:3 65 74 70 54 62 61 Oconee-3 644,400 20,5:3,0*4 98 7G 77 95 63 53 TFJ-1 605,659 22.f.17,215 100 85 31 97 79 75

~

ANO-1 6c5,755 18 ? ;,922 98 81 76 93 67 63 Rancho Secs 500,127 15 20,224 100 75-

$4 59 57 42 Crystal River-2 0

5,253,297 O

49 61 0

44 47 Davis-8 esse 151.451 2.107.A 2 53' 58' 23 29' 03

• Total :Cah 2,5!0,5Z2 123,501,534 A'9-75 72 57 59 g

wetgntes Avg.*

73 52 Plant Heat Rate 2, net (average for SC units) = 10.712 STU/heh Plant Mea Kata, net (average for att c:::er c;srating units') = 11,c5311*J/beh 35 face initial star.us

' State c~arcial caerstien 224 sed en :'.axi=u: Cependante Capacity :let since c::=er:f al c;eration

• Average t.*.rcush 8'*eighted agains*, tstal

• ah l

• Last 10 c=nths.

AU01:57 C7??177C"1 Cc: nee-2, hree :*!le Island-i, Arkansas !! clear 0. -1, and ?.anctic facs all c;srated a:

cr r. ear =axi...:= ca:acity for Os entire r.:nta.

Cecnce-2 was shutd:en en Au us: 11 :

again on August la c.e ta failed seals en ha 20 ;u=;s.re: sic fatted KC :.:== leak 04:nce-1 nectad res14:a 21 cf a failed sta::r in early Augas: at:ng uit'. re: air: ::

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