ML19322A337
| ML19322A337 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/15/1979 |
| From: | Rehm T NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Helfman S PRESIDENT'S COMMISSION ON THE ACCIDENT AT THREE MILE |
| References | |
| TASK-TF, TASK-TMR ACRS-T, NUDOCS 7909240194 | |
| Download: ML19322A337 (23) | |
Text
r-
+ r[
b O
~
f,_
[
UNITED STATES
[, 'g
==
4 NUCLEAR REGULATORY COMMISSION y
- 8 WASHINGTON, D. C. 20555
.. g-
% ll,
't
%' ' ~
.o#
August 15, 1979 OMS NSO SEFT D.4, A D o
@nLl ;
Q i
{
Mr. Stan Helfman
=
J President's Conmission on Three Mile Island 2100 M Street, NW, Suite 714
- Ef! 1 Washington, DC 20037
Dear Stan:
Here are theftranscriptiextractsIKarl Seyfrit! promised as a hF result of his interview.
!=.
Eu I regret the delay, but one transcript was misplaced and both
~
~
=i had to be pulled from microfiche.
l -
i
~
. A.
m, Assist t to the Executive r for Operations
==
Kevin Cornell, NRC TMI Inquiry Group [
cc:
Bill Besaw, ADM t
ll.5:
il i!!
~
~.
[.l.
'IYI i
h))ll I
i Y5b!
ii O!
cgL0 Iy
~
1
/00
+
i 1
EfE.
~
f5 __
n==
-v
- =
- =-
G
r- --
e " Td*"""3
' ' 4.mer-W
- W-e*
61==
7
.*yres=* *==---
w.-
4~-
z.wAB@S rwrar Oc, x M77 i
)
3 72 34f -
l l
I of ten cause cc:a degradatica of the roter etic'.:. but it 3
tu
.t taka a 1cng tico.botero it cdo cny diffctcn 3
Once tho turbtno was vibrating, they cd:! scao -
4 UR. VG P.2L!.!: tho inter.t wcc to.icincto tho D
levar harten cedoc, to ci$ici:o that.
I 0
CF.A!r."1 EE: cst How ceny anto cro cerrue:Ino
?
tho cordition? Aro I of thac?
O UD. VGT.2Lt.1:
I.dicated, va didn't coo 9
a safoty cencarn co wa didn'- cha a st rmy cf all the 10 pica ts. I attbapted to f.d cut much oc I could for tho j
1 Il coC31ttco..
Q
. 12 I in:lic' cd - ! kne:t that Su -
hoc cc ploted j
13 10, cad Dicbio nyen cad Ttirkey Point 3 to - ing de:n.
la C'
!T3fA!112CG8 Tnic would not bo i 'perted as i
10 part of v er LQ cyctoo?
10 MD. VCr.5LLI It is act a cafoty ccacarn.
17 PRGF. I GRs I heps Vrc. h*orner in told about t 10 har.:enic difforenco.
60 CF.A!!r,JA!1 CUCQ8 l!,,ca not cJro what up,,J!ill tall 20 hora yet.
i 21 tioxt subjoct.
22 UR. Goc:Q Tho nout problom 13 Davic-Occca, 23 Tad predloo with Devic-Bonso', cadIrarl Seyfritl froa IaG cill 24 hard10 that.
O O
MR. SEYFRITs I co !!arl Soyfrit feca Incpec,tica cad eg h eg,ese ggg g, 4_r 6
L_
1
7..
q
- - - - - - - - ~ ~ ' - -
O uv3 34 l
Enforcement.
}
i 2
iThe event' occurred en'tho' 24th of this useth. tho 3
roector was cporating at only 9 percont powar at the tiso.
4 The turbine was bypacccd and steam was being rojactod to j
S the confcadr. They oro still in their ctcit-cp tocting a
pregram. This ovont was initictod by a cpericus signo!
7 which gova o ono4tc1f trip of the etcco cnd focdwater 0
rupturo control cyctc3 9
Tais plcnt is one -- I c3 net curo shothar it 10 is tho only eno - but it is.at loc 3t icne of the very; fou Ii Ithat has the stoam 'and foodwater rupture centrol cystoc Q
22 thich is dccigned 'to coho cure that if you got a rupturo 13 cf tho stor tino er tho foedvator lino, ycu ccn icolato 14 the offected stoca generater and uco tho other stosa 10 conorater tho.) cc tho hoot cink furthor into tho occidcat.
16 Tha half-trip ccucod the cic:uro of the ctartt:s 17 foodwotor flo t to' the nucbcr two stos3. gonoratcr oc par.
I 10 of tho action that occura cutomatical?y.
19 Ac. a recult of this, tho loval in that ctoso i
j CD ganorater droppod, which couccd the pricory ;cep tcaporaturo 21 in the affootod loop to incrcoco, cnd tho stoca conorator 22
- oval, of courco. to go down, cad oventually it roached 23 tho low water loval trip which in 17 inchoc cf indicated C4 lo vo 1.
Q ES Nhon,you reach that point, than ycu got a full i
I.
l i
l
~ _ -._- -~~
i l
7-r~c-4.TlOS$-;
'N
,. - ik h3
~
O w
us 4
I actuatten of the otoam foo'ctratar flow - stcc2 wctor rupturo 2
control system.
3 Tao actuation of. this systom cac:co tho 'esi.n-
~
4 i otean isolation sofve to eless, cnd thca thic ese::rred D
at this facility, it resulted in on inercocad prescurizer o
loval, inorceced primary cystae toc;oraturo cad pressura 7
cnd cteaa g:norator pr'c Curo.
O About;one minuto eftor tho initiatica of thic 9
ovcnt, tha pric3ry cyctc0 prescuro reached the roliof volvo 10 sotting cf about 2230 poundo. And the re110f volvo - tho
~
il (preocurizar relief valve 'oponed es required, but than
~
O la cycled cpon and c1ccod about nine ticos'in a short - about 13 23-coccad parted, cad finolly[ failed'in tho opsn position'.~
~
14 Abou<: 30 saccado of tar tho volvo ctc:t cacn., tho
- U i cpcrater a
- aus11.y tripped the rechtor bacouco et that taco I0 thd proc Uritor wotor loval was eontinuing to increaso^
17 ropSdly, ord oc it turns cut, tho' automatic cerca uculdi 10 T:hova 'esught.hia Eith a foe moro seconds.'
10 You ccn't put a number to that, but it vos very 00 cieco. Following the reactor trip, the proccuri:or lovel 2;
l$agondropping. Tho primary cool'ont temporaturo bcgen 22 dropping and, of course, the primary systea prossuro 23 continued to drop duo to tho stuck-opon roliof volvo os voll 24 oc tho fo:t you would reduco tho amount of hoot you cro O
- s cuttinc :neo eso cvceoo-l
(
l l
1
.....)
.....,;.mua '
. 2 % -.L i ;;;;; L O
oVS 344 1
I At shout 1600 pai, the safety features cetuatica 2
cystsa actusted. All of that equipoent rosponded as 3
de signed. This included the closuro of the quonds tent j
4 isolation valve because that systeel caused tho containcant i
4 0
isolation nicpol.
0 With the proccuriter reloose diccharging inte i
7 tho cold qu3nch tankt qucach tcnk proccuro increccod and 0
tho ruptura dic'k in the qucnch tank rupturcd co designed.
9 Ult!=atoly, otoen generater nuabar 2 actually 10 uont dry, and some boiling occurred in the primar/ systoa lI
- stnen tho temgeraturo and pressuro dropped down to tho O
t2 rcaturatiai acine 13 The auxiliary food pumps had eterted cbout j
14 uto end a half minutos ofter tha start of tho ovont.
K0 avor.
ID cu::ilicry foc:1 pesp nu:dcr two did not ecco up to full 10 tpcod, cnd at its Icw cpood it diUn't dovalop sufficient
- 7 dischargo hocf to actually put any wotor into tho stcon 10 canorator bac2uce the stcom gonorator proscuro vec still
- 9 up in the COO or 900 pcund ranga.
! About IS sinutes af ter tho ovent started, tha 21 operatori$ut the nunhar 2 auxiliary feed pump on manual i
22 c0ntrol end was oblo to get it to full spood end in occonco.
23
[that then comp 1'otoly terminated this tronsioni.
t
'4 Tnoro oro two other thirga that we could cat into.
O a
i>ut thina "ithcut cotecno into a croot scot ce ectoit.
.m.,
yg _ __
_ ym F
a
g-,
y
~. - 3 N..
.,i-w,r 1
i e
)
ovs 249 r
i prabably would be more confucing than holpful. I would 2
prefer not to do that noE.
I anticipato that v3 williesso.
O
- r. back to. the committee with a report of tho resciutien cf 4
ithic ovent after the investigation is completed.
b I wcnted to point out that the evaluation 10 i
0 still in procrecc. The findings to dote include the fo'llouing, which I think begin to put the story tosother 7
IS O
protty wall.
f 9
It locka 11ko acce loose termination lucc woro 10 prc5cbly responsibio for tho initial spurieuc half-trip cf il the stoso foedwater rupturo c0ntrol cystoa. Two cuch O
- =
connoceleno voro feund in that fato=.
l' 10 Ac you :11 know. I sa curo, it 13 very difficult l
to provo pccit'ivoly that that kind of ca ovant wc3 ccucad l
- 4 t
- D L7 thoco 1 coco cciinactienc. but at locat it ic quito i
10 cartain that thsco leoco cennoctienc hcd the ec;cbility cf i
17 caucing it.
l 10 In cddf tion to having found thoco, the 10 licencoo is putting come instrtnontotien in thic cystea to E0 provido o porocnont rocord chould they avor got cuch O!
o thirig cgoin, and will bo oblo to then track it bottor cad
{
22 bo cero that wo roolly got tha culprit tho first timo er l
23 ct 10000 find wh' t it is tho cocond timo.
a 2
- C s..
h
~.q f ~~ ~
,. w m n
.: - a -,
O
- pJ6-ann!
346 L
i A second finding which probably weo instrumental 2
in causing the re11of valve to foil, and this one us havo 3
not yet chased down as to why, buththere was a relay that.
4 had been removed from the relief valve control circuit and D
this relay offoetively o11minated the intendcd depth band 6
for that ro11of valvo, so that the ro11of valve, inctacd of l
7 cpcning and rocatning opon until tho proccuro had drcopad 0
coca cignificant ecount, cpanod and closod very rapidly.
o richt cround tho not point.
i 10 A third itcc, the problea with tho cuzilicry
- 1 fccd. pump, it wac. found thct tho gworner en tho ou 1113ry O
is fcod op a peap had boune.
port 1y chio 12 cc=othina that i
- S they hcd hcd s=ao difficulty with boforo, altheuch th
.4 difficulty in thQ carlior tics had boon aluring ceno pro-cp IS tocting cnd wo had no.roport of thic.
i l
l 10 It cppocro thcro is cc:30 mr $anica by which a 17 rod in this cororner gots o buildup of cred en it, and than 10 decon't cctuat 2.
After this ovant, they tootod this thing 19 ci : or sovcn tioon, cnd it worked fino until tho lect tirc.a I.0 they testod it, then it hung up cgoin.
21 MR. ETHER!!4GTO:1 Den't thoy cico havo o cotor-T.3 driven otr.:iliary punp?
23 MR. SEYFRI*f I den't boliovo they do.
- Solio vo 04 thoirs cro both turbino-drivon.
O 3
A fcurth finding, when tho quench tcnk ruptro l
1 ww.
.,a-e g_ _
- _w-_-__
.nww mum.nem, n.,
h
i, i
.._._ A21.l L1,Z M.ikE
.!'._....L.-g_
'l
, 9..._
i f
i
'O enna 347 J
I disc ruptured.several insulation penets were knocked off 3
1 2
cno of the staats generators, arti, however they weren't i
3 chewed up. The ahole panel come. oft. These are panels that
]
4 oro pretty sizchte.
f S
I don't know the c::ect size of thca, and they l
0 cro kind of put on in on ovoricpping fcchio1 cad cteso 7
impinsod and got undarncoth the panol sad juct lif ted it off.
t 0
The fif th finding was that sooa ccfoty-related I
i o
cables vero dacocad. K:wovor, whon they designad the plant
}
!O they rccconized tho potential for stoom diccharga crcund tha
~
q'ucnch tend cnd thoro wore no cafoty-related ccblos in f
I; O
ia that vicinity. =e no fety-r 1 tod cable = woro <>=> coa.
i 3
'Tho regional offico hos cent en is;acdiota acti n 4
lottor to tho 11can30e which, in offoct, requires that tha iD plcat chut dcun utloca analycis of tho ovant hos been i
{
id '
cocploted cad wo invo had a chcned to review that cad 7
datormino that a roturn to oporatien ic wortcnted.
f
.2
'MR. EB.!RSof.E8' Did tho pumps continua to run, tha 19 coin ccolont puap37 i
O MR. SEYFRIT Thoy did until they wero canually 2;
trippsd by tho oporotor como minutos into the ovent.
l C
MR. EBERSOLE: ! Did thelhigh-procouro E003 puapsL
' esca en end._ cf. ort 'to inject?
23 24 MR. SEYFRIT: IYos.; They como on at tha timo -
O a
- h=vo ecrecetcn new eer the acaent what initioted tho=o.
l 1
.~-- -
l
_.y
!m _c 1.,. ^
-at -: :s.....m..
-- - ~ ~ -
O I
ann 3 343 j
i MR. CE2C0cLU8 Low-levol in tho proc:uriscr?
3 MR. SCIFatie Yes, it ueo about 1600 poundo. It 3
usa tho low prescura cyatom that got it.
4 MR. CE2CCCLU8 [Did that charge' tNo system with !
O water?
su o
MR. SCIFRtTs'I Ro.
i 7
MR. EC2CCLE: the aperator turned thea cff?-
C MR. CClFJITs !Yes.1 DR. CH2CCU,8 (What was ths.satting supposed to ba?5 0
i]
MR. CUYFRIT8 !!' don't really havo on cnswer to I
ithatk 12
_ DR. GCC.*.t!*18 Thom is no cpac en this thi.10 l
13 Feiling six ticea er nino ticas doesn't curprica yeu?
ia MR. iUYFRITs I didn't say it didn't curprica Oc.
10 1ho fact that it bcnced back and ferth nino ticas. I thin %
'0 the rapidity is prcbably acro imprt nt, than '. hat ena wculd cupect frca o e;cning cnd c1ccing. I thin % there v:: :
i, l0 quito o different cat cf circucatan:ca.
19 PROF. KERRs How long uculd ycu quacs it trauld C3 tol:o co cat bac% en lino?
OI MR. SCIFRITs I cnticipato they will to bc:2 :-
E2 tho lino within the next I'sw doyc. Our inspo: tors cra at Oc 23 cito new. Execpt for the itomo I havo acntioned. all.cf tha 24 cafoty-rolotod instrt:acntation did ' function oc it was O
a cuppeced eo.
= roeien a poepio feel en tho eacia ee thi:
I
~-^-^-~
I
.m myg..
- x..'.=
.y
..2--
)
i r..na 2eo i
I procenca et tho picnt th5t tha licencos to ts2ino I
2 cp;tcpricto c tica to c0rrc'et theco itcca that were femd 3
to bo datoctive. They bre cc Citted to doing cuitablo I
o tocting of tha ccupOnonts, that's that cur pe:plo cro thero 3
at tha cito for row, and tha cojer thing that uo oro holdirig O
up fer richt nov to o mero ferc31 c.alyaic which csyc, ue
?
think thinC.3 aro etcy, be:cuco. It's tho bacou:o that to O
dsn't roally hc70 in head riCht nov.
9 C3. CIUC8 ter1, 'it cocos to me that I hevo coca 10
?a'ar.Orac11y 1crCa nuabora of LElla fmn Da'vis-Bacse, ono during startt:p. It loc 2s 11ho thare oro threo poscibilitics.
..)
12 hho'.ic,. it is]Chnormally large. for startup at a picat cad IS
- cnother ic, it#Si typical of;plcnts 'during startup cnd l4 cnothar' is', thero in 5 difforont' interpretation en what ic 10 cn LED, cither by @o cppliccnt or by tho IGO now.
- 0-L;2. CUYi-7tT
- I uculd et:;coct a fcurb P.
pocaibility, fronk.y, cnd that intoll'throolef thoco thin;c I
10 cro cativo to o'e:az:rco. It is typical that thoro cre c
- 9 lon]o nucbor of LUIU du~ ring the stcrtup period fcr c.T/
j i
l 20 f acili ty. Thorn hcs boon, oc you knew, cbcut a yocr ego, o i
i 2;
i j
now cot of instructicna for roporting thoso kindo of ovontc, i
22 chich prebsbly has incroossd the reporting '.n como aroos, 5
22 cnd tho lost itoa, of courso, is that thoro cro differencos i
1
~.A cf interpretation c3 to what is roportabio and Davic-3ccco.
O 2
eo rotoe, ceir.on cro o n-utiuty, cnd in cy cpinica cre I
f.
h
- e.um.mN, e em e wNemwhkW N 8-6 ea
-W^
i
-~-...
y w--
' m I
p :: y* ?.c'. ?.'*:Y~Y' A
"4,L,= ~ L- ~ ~ L* :--, =L- ~ - -. -
O o. r.3 350 prcbsbly reperting core than would be strictly required tr/
2 tho roporting requiroacnts as wo interpret them.
2 DR. SIEss: A lot of things soea to bo the I:ind 4
of thing ycu 0::;cct to find during startup, but thoso cro 3
roportablo in your epinien?
0 ER. C3YQITs T*dt is true. Ib ccko no r
7 distinction cbcut thether they.hc;;on d: ring the startup G
tacting phcao er what*1cr thoy ctort - w:.3Cicr they hcppan.
9 lotar in lifo. Tno ropertcbi.11ty is baccd en tho event.
10 not t. hen it cecurs.
- l DR'. SIEggs t In your jud;3 cat. 'it's really not I2
' uniqua er vorf unucudk 13 MR. CUYQIT* 'I den #t'bolieve it.is.'
14 YMR; ECECOLE: Tnis you ccy, occurred at 9 parcont.
10 T. sic vos at c.::o fc.i hcurs aftor thay waro at 9 porcent. I h
- C you intend to c;ttrcpolato what voijld hevo hap;cnod ct100 Yparcont?:
80 MR. CE/FDITs At IC0 parcent -
i 19 MR. CC2CCLE: Tnoro is ovary rcocon to think this 20 could. hove been doforred until they woro at 100 parcent for l
21 30 days.
22 MR. SE(FRITs Without gotting into all tho 23 datoils%1ch I'm not reo.11y prepared to do II think ycu wili!
24 ifin:1 it's'not like'1y they could be in this porticular:
f.0
[ position et 100 percent ' power.' ihoro cro cnothar nucber ".
t h
l L._
.,, m g y-
+
- en:c
,,,4 _.. _w.,,.,.,..,. _ c. a
-+
t
--)
<. t cr.r $
sgi 1
factera involving how syste:ss have to bo 01 toned,p.ict:
0
- t. hey cecidn't do at l'00 porcent povor.
3 CHAIR:lAN EE" Dens Further quastiona?
4 Th n2. yc:.3, l'.crl.
S En. CT.0CQ8 Tha so::t. itca en tho cocada then, 0
Rt. Chcircen,13 a ct::=ary of Ibrcg 0012 on fcod water 7
.no=10 crac2ing.
0 Dick Johnson frc3 0210 to talk cbot, that.
0 10 11 12 13 I4 10 16 17 10 19 I
20 1
1 1
23 J4 0
e 990 g
-e e-6 e
>aw wee *e msud---
e,
,----_.------._--m,..
.. 3 wi.m-
.. :y t
[.
fiv)NSCRI V 174 3
1977 ca.:20 oV j
?$$'
/ / c::;dr=.y. f:xyd:
sc N ice,d / / / 7 I
Kp.. C::T/RIT: Tho next iten I una ccked to Giccuco l
3i i
I uco tho ! Davis-Besse spurious oteam unto: control cyoten ovent.
i 4
At tho Octcbo Acpa r.coting tho ovont which occurred ct Si csvio-3 caco on* 8eptacho: 24th uca diccussed. Thio ovent involvef oi i
t tha cpuricus half-trip of the ctoca fooducto: rupturo centro *.
~
l 7k cyctc:, followed by fciluro oe tho pecocurizod powc n 11o2 0:
valvo 'n tha open position, tho rupt=0 of tho quonen tank
.}
9!
l J
ruptura dico c d tho Sciluro of cno etnilic=y foodwato:
106
- *' ~
~
~
c
. - ~ ~ ~.
pu:2 to racch full c;ced.
11:
~..
As a recuit of theco circu=3taneco, eno ctcca zy sono:stor vao blown dry cnd como boiling cppc:catly cce=:cd :.n.
O i ll the pri=cr/ coolcnt cyaton.
14 l
5:a hava not yet received tho Licensoo?c dotalled ;
j IC ovaluation of thio ovant. Thic is cupe cted cbcut Novembc: 15 th. !
to i
Ecuavar, baccd en a ec paricen to cnalyce. tecnoienta,ivo havo1 17' {concludod that recu=ption of epo:sEien was. pore.iosible, I
10 i
fo11 cuing the cc : action cad tacting of tho ecmpenents which 19 calfunctionod during the ovent.
10 The Liconcoo cada tho'noccacary ecpairo cnd co..-
\\
n1 ploted tho tcoting to decenatzsto cporchility cnd has : cot =cd e., '
tocting.
"3
A repont of the cpuricca half-trip of the otoca i
- '4 ;
. A...,...
t.
f:cfm t,,:
ruptro centrol cyatco occ=:cd on Octche: 22nd.
"]ntthctti=aattocho: cyatena functiened cer:cce17 f
f I
l t
<Q
(~-
,.~
.--~4._
y-.%m.r L _..
__-_. ~
y i
-70 l
1:
Fo11o;;1cq tha first cwnt, the Liccesso botclied L....,
i i
y 3:
inat=u=antatica c.ich ves intcudad to date.. ' c uh:2 cpecific 3
ovent triCgo=ad tha half-t=ip of tho C7c:3.
i i
4 Pa i=0t
-tstion vcs instalico ce tho impeto 1
0 to ths logia not:ic::h. !*othing won datocted i= thio &o e
6j opurious cetdstics.
7l Ey a pro = ca of c"-8 antics, tha t"-M holieseo O,
ho has t ::ad tha p :blem to two c cco of Icgic nota:2..
1 l
na cc.,;cce e~ -~~to have bc n.*.t:plscod c:d cfficia2.'-
~
p
~
1
- 0 cenitoring og"'r't has now boca inot
- 11cd in ti: Icg10 cytaa tt.
in en offect to datoct c:7 futurc cpe: ices ciFts in the:c 13 circuita.
I
- *
- 6==2 *= ** 5"""
== -
~
O w
t2 D't. C W C3: Can you put that i=itici cocnt in a littlo botto:: costc=t? I d:stt =cally follou 5.; hat you arc l
3 i
s
- acying, to
!Cl. CON: Sat is s; hat'I hepc to do nc.r.
- 7 i
uce try g to p Secugh a co:ios of cura 11 cents. m l
j 10l i
i 39l v11 go back na..d talk cbout tho opccific initici cent. *:he
- cccto ucs oporating at 10 percoat peuor, t.s : ctated ia
,0 t
tho October umoting, following the 07Pc3 hclf-trip, cad thic
.s I
half-trip, incidentally, cauces cc:a things to he;;ca in
,g
,3:
pcet of the cocondcry cycton, the feoductor ic chut off in tho
[
cyctcm that rocoivos tho trip, in that half of the Opotca.
,,.4 j
q i
'U
' [a#
Fc11 cuing tho half-trip, the nc bcr tuo icep i.
s I
i l
I m
. =...-
I
,a
.y ;, e.
.,1 w
N.}p -
v e~
~
liG i
i tu3 I'
I otert-up fcodwator ccatrol valvo closed, which otopped ester l
0 21
~ '
oopp1y to the ac=ho,2.to.= g=r.oroto,.
3!
The staan generator lovel bogen doc =otsing and, et i
1 4 '.
tho oc=a timo, boesume you es=ovo part of the host removal 4
ccpcbility, reactor coolant to:porature vaa increcsing.
^
l S!
0' At this point thorosetor has not yet been tripped.
i 7-Yho precoura layof, increased.
l O'
the nu=bor 2 ste:n generact; vached t.ho leu Icvc1 i
i 9l trip ubich caused tho full oto:n.feedwato rupturo centrol
{
- C;
cyotan trip. S at is a.couthful.
IIl Sis trip results in clear.re of the ICIV'c cn both 12l loops now. The oteam gonorator pressuro, with the ctoca, IG 7'c i
Q 13
'closod, incroccod.
I 14 Wa still haven't trippod tho :eector. "* cau. sed 3
' S l, the pracourico ro.iof valvo to opon. A..olay in tha valva i
14l contro'. circuit hcd tuon sciiGsdd 53: un:ce:wn tocacnc. Wa ceill
~7 ',l don't 1:now why it P cd boon =cnovod, but it was cut of the ciranit I
l I
10.!
2 10, i: offect clicincted tho usuci docd b-~' "- a l
j 19I tho valvo centrolo. And tho valvoa then cycled epon cnd toI closod, ecpidly, chouu nino tinos, right c:cund tho relief 01 3 ces point, bocacco thoro was no dond band clicucnce to clieu
{
i 12,i the peccouro to drop down como valuo, and then rococt. It i
13 l roccated i=nedictoly when it pcsoed tho trip point.
1 i
24ri Aftor cycling chout nino tinos vory ecpidly, it i
A
' c:q tc.:sa. s 4 3 1 otuch in the epon pocition.
I
.a.go,,se eioe-er' ew
" "i-M
- H ip a _. y,_3,.; r,
,, J _
--c 177 bw4 i
l' O.o!aus 'geodwator pu=p started co the 1svol dropped O
de n in uso s======. w =eem 9-, c -. w -
i ull speed and bogan putting water in 'tho steam'generato:
}
3; f
4: Inumber 1.
.I 4
5; The; number 2 peup, howeverI failed to reach fu11 t
(
4'.
..#cpeed.
It reached only shout 2600 ryc. At this point, tho 7
dicchargo head developed 10 about, eh, a mautmun cf.700 poi.
1 believe that i gave you come curves which cheu -
0 i
9; did you got tha handout? Thore is a pu=p perfernaneo curve in 10f that r.atorini -
t 11i DR. :CJ2: How is the opening and closing eine I
~
t i
l 12f timan? How is t' sat boliovcito ho nino?
1 "In t' sat rocordod acrocoro?
4 Q
13:
l MR.SCUMT That was based en p===::::o =ccordi=gs 14, j I
cnd cocillaticas in tha proccuro.
15 y
'l, At the ti=a that t *.to curil.ia,r food pu=p ec.=a en
- g J
\\
l I
cni Sciled to =cach cpeed, the stoca generator p::: uro ucc
- 7-I
{
- g.
hit e * "1 tho diochargo head that the pu=p vec ca-Asic cf i
h
- 9 '
dousleping, cnd, thereforo, no vato: was.boing cddad to tha l
j l
f
- 3' ctcca gonorato
- numba: 2 for coversi cinutos. 5:is alic.:cd J
tho lovel to drop until the stonn generator finally vont dry, f
77 -
e
'"no; Licensee. and his ' nuclear steam supply synton -
i 3;
I E han ovaluated the' event cnd the cenditiens experienced during
~
9 3
co j
..l tho event by[ comparing Uso observations recordingsiend f
i O,""h '
forth,ito valuco cbtainod 'in the canlycod t:casients that cro V
i i
~ ~ - -
- Nh-
- = =
hemmm -,,,
,4s
... m..p....wr 170 o
ow5 Ii
- oportad in the FDA2. PartiOnt copocco of thic initial O
ovaluation include the followings Stoco sonorator componecto 3;
j are dasigned to accopt 40 cyclos of deproosurication, where the 41 l
prosaure drops 1400 poi and the tc=porature d=cpo G2 F in 15
{
3l minutes.
o
\\
l In thin axial t= noient, the presouro dropped cbcut j
7l l
1350 psi cnd the temporature d=opped about 45 degreco in l
01 i
71/2 cinutes. Since the procoure chcago of the cxici c cnoicat,
p I
10 less than the gonoralicsd transient, the ot=cso offect duc to prossu o would likovice be loss. Ehile tha rato of ta=perat ::u Ili changa is oc= what groator in the a=ial trc=oient thca for tho
~
generaliced t:casient, the ovorail to:poraturo chango io ch :t O
13 17' F car,, Theos difforoncas tond to bo omhat effootH J, 1
141 l
cnd thus vo boliovd tho ecoulting otrosses will bo littlo I8 difforent duo to the % d.c3 th::n tho ganarali::od caso...
16 And will likely bo co= what c=allor.
t I
I i
Nu=bo.: 3, the docign tranccit.3 includo 20 cycles, i,
'l
.Di i
in v.'s.ich the focilwator is lect to ono concasar cad tha gonorater ovapoented to a d..y preocuri::cd conditica, fallered Mi by :.pid introduction of feodwator.
i U
"v1 major concorn horo is variation in tho tubo to U
cho11 tubo torpo.mturo difforoncos.
i 23.
In tho axial transient the otona gonorater ucs i,
.,4 l-dry for chout 13 minutes during which tho roactor coolant tm w 23; tcrporaturo f cpped 50 F.
I
.I l
I
_,_,g__-.wm-wm-=-
~
~ ~ ~ ~ ~
~ "
- + - - -
_1
+~
-,, _, _,,. 3
- ,4
-.q... -wi.:.:aw-.. :
l 179 l
hv3 1
t Wa bo11 ova this condition vec not cufficient to l
O 2
causo ot:aos or dofo: stics within the tubco.
3 5
It is within the catchliched dooign lir.ito.
4 Nu=bo: 3, ths=o was co=o; possibility of cavitatiem S
chnago to tho =eactor cooiant' pe=p inqpe11ero, bea:ingo and.
l l
~
0, coals, due to.the b4111ag which cppccro to h0Vo cccur ca in e.y.
the pricary cyaten.
g.
Tho!evidanoo for this boiling bccically vc3 9,
~
) interruption 'of soni votar flow cnd ce=0 ince:bility in 0:o,
- 0; lcoal cavity p occu=oo. d11 four pu=ps hcd loco or erratic 11 I
soal injo= tion flow for chout eno cad ono qus to cinutes.
i 12)
'3:o pu=ps follcuing thio ovent, ucro i=ot_u=cated t
0 13$
to concuro chaft vibratieno, coal cavity p ccouros c d cther Oignificant scr=:ctn:c, enditested prior to recu=p**
I 14:
c 1S;
~
icporaticac.
.o:
No indicatieno of dc=ago uc c. chec:ved. Additicnal
,7, 1
"octs ucro porformed en the pt=po cSto: the p:ccouro, the 10..
aycten p ccouro now wo cro talking cheut, ucs ine:cc=cd chevo i
}
I, 19l L100 poi r.nd cgain thoro voro no chnormal conditions ebcorved.
l 10' l
Nu=co: 4, Dcbcock cnd Wilco:t hc3 ovaluated i
n;?
~
thic event with rogard to tho offects en fuel,. cnd has cen-
-a s l
ciudod that thoro cro no ransons to boliovo the fuel ucs j
^3 cdvorsoly affected.
a.1 i Thio ia baced en tho fcet that the coro burn-up at i O
.:v ww:..r...
- S i
the tico of t'.o ovont was caly cheut en offcetivo full-pero: day.
i i
k i
I
.. _...-. _ -- - - -- - -.... ~. _, _._ _, _
i
n.. -. -. n l
20 09 URC 's,
O 4
..~.
. t.
-n ISO bw7 1
Yao :szican feal cico +7craturo vac 5908 F.
Scro
)
0' uas no :r. ore than cbcut 300 pai prcsouro differentici cer:cs 3
the cladding at cny ti=a, which would hcvc cxisted at the
{
l
=
4 cost for oo=othing loss thr.n an hour.
S With tha low irradiation history thic pressure o
- ~'oraturo ec:::'sinstien veuld act bo e::pocted to pecocco crf 7'
undna "--d2 en the froi or ek' 7. Ece :co of the touc:
0:
power hictory, thora vaa no significcat host sc=oro**-
pi the reactor core aftor tho roc = tor bc2 cc c==od.
I 10
~~ T2:sro uds oscentially no docef host at thic point.
11' Mating of tha rolief value after its repcir end rosdje *~- t I
i i
,3[ decenstrated caticfcetery eparatica cfter c$EE:2. cpe -cle:
]
.cycica.
}
- 3 3
- a.
N cajer cdjust=snt cada ucs to recu:2 the cere::2 i s.
3 of tho spilot isivoL cyotan fron cbcut 3 ct t1e incid.a to e:2 ct f
tno incido.
"ho roccon given for this, in thic valvo the pr -
3 coco otocs wit:h coca boron, boric. ccid in it, ic; cased the 1
cyotoa, and with r.oro of.the oyoton exposed to this ficid, a
3 s
9 r.oro (borie, acid ein bel plated 'out'en the cysten, because of 3
tho drying offect of the hot cteam. With icos of tho 77 otocm oxposed to thic, tho:o ic loco chc.co of that =storici i
..,i sf' oring to the cycten end, thoroforo, lecc cMneo of :.t i
C'-
anterfering with frco covocant of the cycten.
4
,, J c,v
.u.m c
e v.
4 ed h
I i
i
r.-
y
~
_ _ _,_ U e -
~,
n F; 42-am t 101 1
DR. SH3hWON: I trust the relcys, giving it the 2
c:aad band -
0 3
MR. SE'/FRIT8 The relay vcs rtinstallsd. yec.
1 The Woodward gevorner en the etcriliary feed pu p turbino O
driver was tostod cavarol ticas ef ter sodificatien of tho 0
cove rner. Vedification included receval,f pertions of a 7
pneucatic speod catting vochcnica which was installed in O
this particular govamor, and was really umococcory, bacau:a 0
they had a pn3tsaatic - well, they had a cervo oter for
- 0 cpood positic. ting, for this governer. cad tho ;ne
- ::stic
- i cocod positicaing function was really unn3coccary. That
- 2 port
- ca cf it was ror.nycd. Tncy testad tho gevamer th:n 2
c: ho licodwet'd governcr co-facilities c numbar of tiacs, cad then efter thoy roinstallod it in the plcnt. ce;ditieno;
- S tacts have bot n parfctnod cn tho oquipcont and oparatiu i
l
- 6 has boon sotit
- factory and as I said. in this lotost tact tha 7
half trip cf the FFSRCS. oporatien uos cotisfactery.
10 CH/.IRMAN B2!iDG 8 Is that it7
!?
DR. MARKS
! ay havo sissed comathing '/:u ci;ht 20 have ccid cbout the preboblo courso of tho spuricus si;nal.
I 21
!c this c misplaced bit in a colid-stato centrol cea:utor.
22 cr cc cthi..g of that cert?
22
.Q.
SEYFRIT:
.fo roolly ';.cyondt yet pinnad t:wi
- 2 der: this cignal como fron. Fo11 cuing the initial cvcn.
".3 they put in a,uap of instrumentation cnd (So theu;n: v:::.
p grer. k <_-
g z,_
- 2. -
i. :\\ sl[si O
vanna sea I
it was a spurious input signal to tho logic circuitry that
)
~
2 had caused tho trip. So all of the input signets wero
,3 instru=ented in en effort to detect $1ch eno eight hevo 4
givan the. spurious signal.
It turned nut, when wo get ths O
sacord one, that was not the eeuca. So. by Ic:2ing at tho o
circuitry and Iceking et what could concoimbly causa cuch a 7
thing, the liccacae bolieves he has narrowed this down to O
two ecc;cnonta. both of Wich have now bean - compondnts -
0 what is tho nci:' largar thing thcn on ine1v!d::31 cc: pen..t ?'
l0 Davi ca. Sich has several cocponents.
- I DR. MARR8 A circuit prcblors in'thic c3ca.
12
- 42. SEYFRIT: It gets difficult to talk about.
]
i3 Cut coco of tho indiviciugl devicos er compenents within tho
- 4 frcmowerk. for oramp10. of tho seplifier, and eno cf tha l0 ce>cpenents they cro talking abcut is on captiflor. They
!d ht vo geno in thoro and replaced cc:a chip 3 and individus1 17 cc lid-stato cccpenents.
10 In cddition tn that, they have no.t instrusanted 19 tho logic circuitry in such a way that they bo11ovo if they j
20 chculd got another one of t'ioco, they will be cble to pin it I
21 down to o specific defice.
22 CHAIR'.! AN BE. DER : Other q"n ? w m?
'6
~j 22 NR.' ESESSOLE: Tnic is o E01 plent'?l t
i
'l
'ia
'!R. SEYFRIT: Yec.
t 25
'tR. ESERSCLE:
Did you moko referenco to coc:ndcry
=
4..-
_.-_er-e w.-p p
- m.,
,*w%.----ma=m as-
&~- - - - -
T
h-:
p r -
\\
ann 3 193 I
cido' levels, being eno of the paroc?'.?rc that caused cc:o 2
of these actions?
3 VR. CC/p217s Steno generator level.
4 MR. CE3R3nLEt could you clear igs for ce how you S
got steen generator level in a once-through boiler? I 6
thought they just had a veristion. if you don't have o pot 7
to detect level frc3.
0 MR. SEYFRITs You are asking me sene Wey 9
cabarrossirrJ quoctions. You know, really. to ha hcnest with 10 yce. I hadn't given any specific thought on that. 'Ihero ic II a loval signol, but how it's generated. I can't toll ycu.
- 2 4R. EC2RCOLE:
It has to 62 cyntheci::cd c=:chca.
13 VsYbo by the cupor heat lo val.
14 UR. SEYFRITs I think caybo it's based en tha 15 loval in 'this downcocer area outsido the two-bundio crea.
10 Dcos cnybody over thoro k.ww? Io anybsc",y fcallier 17 cncu;h with ban ctcco ;cnorators to holp to cut horc?
10 MR. CCC<ER: No holp horo.
19 MR. SEYFRIT: ' Inly the cutboard lovel you havo
- 0 cn auxiliary level.
21 CHAIR'3AN BENDER: Itar1 why don't yw run it coun 4
22 for us cnd lot us know.
23 MR. E2E? SOLE: IAro ' there cny in 1'ications thatl 24 ithis' nec14ent.Jif it _would have happened at full $cwor with; i
1 O
" ' " ' " ' ' " ' " ' " * " * " ' ' " " " " " " * * * " * " ' " " ' " " * " = " " "
.-.-+--w-%
+-m_
_.,.,,.__,__m.,..
-. --~. ma.m e -
t.
r=
ann 4 iC4 I
cn tho fuel, other than a littio bit of in111ng?
i 2
V4. SEYFa!T: I thin % uo c'.ro into en creo choro 3
uo oro sort of ecaporing emples and orencao o 11ttio J boccuco:-
]
4 11f you hed been et full power, there would have been a 0
inumber of th8Nos differently eligned in the system.
?
6'
- 44. EE3250!.28 It's"not regarded es o possibio 7
combination of events et full power.
0
- 42. SEYFRITs
~t think it would be highly isslikely 0
Lto get into the same ce=bination of events ot. full power.
0
- For ex'cplo, the turbine was not in servico, til the ctcco 0-22 13 was being bypassed bc:k to the condancer.
32
- horo ucrolother alignments in the c :::111 cry.
l3
' food wotor pump cystem th3t voro dif;'oront th a c *.:1d b3 h
14 t e caca at full ;:cwor.
IS 17 10 10 20 21 22 23 l'
24 O
" ~ ~ * -
-*N~--w%%.,
_._..,m__.
--'**~
1-m y a - : p ex 7m_-
r.
)
acs !
ISD i
CHA!r.'.!Att ESOD s !f there cro no other questicas.
2 lot #o go to the nort it:0 ca the cCet:do.
I believe, 'tr Crc: hor. ycu wentod to take up 4
kansas Nuclect one, then the Florida Pcwcr a t.?cht systes S
dic crbanco.
O C. CT.30l:E2e That#8 cerrost. fir Scac:ar.
't 7
Sutler vil harrJ10 that for tha Ctoff.
~
0 CS (da.)
x N
9 LfA. C'R !.C28 ihis to Ark:n=32 !!c0!
Cno. C;3co 10 coolors focus.
i Tna licencoe cdvic:d c3 of a 'ct;n t=d::;:::y about t
ct, the I;;0 hald telo-cf Cc;/
12 two m:nths aCo. Da tho C s
J
'. 2 phenc dic:uccienc sith tha C:chtal C::pany Scn Fran:isca to Uffico to datormins whethor th ic:ca eculd bo o qsnarle IS incuo.
to Cn tho :3th c't C:stc:bar, tha Ctaf? cat with the 11 con c/
o, to diccu::3 tha c;acific pic*alca cnd
.7 f.rkonc 33,
/
'O tehot c:rrective concuro Arkanca pic; 3oc.
'N
/
i9
('
tho 'Oth of C:ste:bar, wo had cacthor toic, thens ID converaation with !!achtol cr.d reco1vod ccnfimationfrca thac
/
\\
'. I that th% dacign triod)quacy er design crror was not Canaric l
in ch actor cnd wc3 not expected to bo in other Sochtol 1
23 do n plants.
l l
4 (Slido. )
15 Briefly statod, the probloc ist thero cro fcur Q
(
J c