ML19207A181
| ML19207A181 | |
| Person / Time | |
|---|---|
| Issue date: | 07/11/1979 |
| From: | Hendrie J NRC COMMISSION (OCM) |
| To: | Kemeny J PRESIDENT'S COMMISSION ON THE ACCIDENT AT THREE MILE |
| Shared Package | |
| ML19207A182 | List: |
| References | |
| NUDOCS 7908060454 | |
| Download: ML19207A181 (2) | |
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'4 U'JITED S F A TcS 9
.,%.p NtJCt.E AR REGllLATORY COT'. MISSION s
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'UL 11579 s
CF flCE Or THE C; 4 M k.'. A'J
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h h g 4c-f he l'onorable Jchn G. Kcceny D ("'W
[0 9.0 yu > "
Cha ti. an, Presidcot's Co: ;,ission on D
the Accident at Three Mile Island 2100 M S treet,
h'.W.
t.'a s h i n g t o n, D. C.
20037 Cear Mr. Chair. an:
Neing his tcs tirony on June 1,1979, :'oyr Ma ttsen, Director of Systcas Safety, is d.ed by Co?missioner Taylor to dcstribe Icw the accident at 'i.ree Mile Island tight have dif fered if the cperating history of the core had been lorger Cc..a ssioner laylor and Dr. Mattson discue.:d the subject briefly in the ccurse of that testic.ony and two idai tional pieccs of analytical infomation wire su ;g.s ted as useful, n< aly, a co. arisco of decay heat and fissico prcluct characteris tics of the iMI-2 fuel with parametric variations in the plant oprating his tory md a unsitivity study of the IMI-2 core heatup trar.sient with par.cetric '.iriations in the decay hnat.
The first of thc se t'.co acditicnal pieces of infoma tion is provided in U.e Encicsed staff.2
- randu
- a of t una 5,19/9 tha t s u..
- a ri/es how
- c ay heat and isatope inventcry vary ei+h O'unded core c wration.
ihe second analysis iten, will require lo.iger to complete.
As part of 2C's continuing investigation of the acci&nt, < chysical (cns.nter-ing) description of the iMI 2 accidcot ;e cence will he d teloped by the MC staff and its cor.sultants, including calculatioris of the lMI-2 care heatup trc.nsient with detailed thencal cod hydraulic imdeling of the reactor, the core, and the process '. riables crasured in the course
': hen these detailed ccs,.ater calculations are cc:n-of the accj& nt.
pleto, 'hich will rcquire another several ionths, then parawetric variations of decay heat and isotope inventory corresponding to the passible range of operating history for the reactor will be develtped ind published.
Such par,u etric analy;es will provide;tre definitive en'.. irs to cuestion s ccncerning the ( msible range of conuquences of the JCCident, inClud ing the libcliIt'~ d of ii dl i.el t.
7 77 89 L
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e John G. Me.ceny 2
At this tine, as indicated by the c.nalyses described in the enclosure, en increase in the dcc.y beat level of the iMI-2 core to correspond to a raxirun operating history would not appear to have a significant effect on the likelihood of fuel relt.
Sincerely, 1
1 I
Orisi::"1 sic,cd Et 7050ph M. Henid t)
Jouph M. h'cndrie s
\\S Chairean i
fnclosure:
D L
l'a orai.dum from H. Richings 9
to R. l'attson dtd 6/S//9 6
bcc:
Cc.nissioner Gilinsky Cc missicner Kt.nn:dy Ce missioner Pr.!dford C/R ;0TE:
This letter has becn cleared Cc~;issioner Thearne with all Ccm issioners and approved for signature.
DISlRIEUi10N:
Central Files trR o ading
- JN Ceading H Richings E. Case H. Denton K. Cornell '
N J. ii. Hendrie b-OCM d' q s
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June 5,19/9 Nb v
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" 0?';DUM FOR:
Ror;er J. l'a ttson, Director k
Division of Sys teas Sa fety y
F LiGM:
IS,tard J. Richings, Pi ic tor Physics Section l
Core Perfor.ince 9ecmch, USS SU' JECT:
DECAY EAT r.',D I9iOPES !M 1:'I-2
{' EX ! r ' XD opt.: Ail 01 This is a response to the r;uestion of k.-/ rs ;ch the decay he a t v. sold it.cre, se during the shutdc.n ti:ce for t.hich there ;as pattntial for fuel d' wje and
. 21 t in il11 -2 i f the e :i:ra t i ng hi n' o ry o f iMI-2 F id t ee n i_ < ! - m.',d to r :x i.-
r,ize fiss ion prcduct buil Ap.
Isolo;m Luildup is also disc ssed.
The acco. :nying table gives the 'acay heat (in percent of full paer for iMI-2) for tha i'~'.1 -2 o; o ra ti ng hi s tory and for sc ve ra l e s u-i operating histon os.
Th? ? Ji:
n tin.s
^1ned bractot the ti: os during.hich i,
fue l -.je iy ),ae cccurred (a S ut 2 to 15 heurs c>fter shut b.n).
The pri..iry du.ge is ;r ecntly tu'jht to !. ve occurred mar 3 3 urs after t h ;t^ vn.
Tho catn cs in th' teble are as follows:
1.
The de:iy he it fcr the ictu]l iI--2 0; e ra t i ng h i' t o ry ('
- ittiched a describing ' his his tory).
2.
Cec.iy heat ass,'.ing o.:ra tion it full (it',I-2) F.ar for en infinite time and with all fisticms Fol U235.
3.
D; cay heat from infinite e;mration wi!.h all fi< ;ir ns iro "u239.
It ay La noted tha t & cay hoet fccn Pu/39 is 1. ss than Fr - UT35, thus buildup of Pu fre.1 0:aration tends to reduce the decay it total.
(Pu239 ind l'235 hracket c.s well as dom.inate contributicos fro, other fissile isoto.,es and i.hus cthers ni ed not he censidered in chose <.cn-parisons.)
4.
Cecay heit feca U235 assu aing finite (but continuous) full ro.er o;n.ra tion for 2 j; irs, a but nup of Aout 24,000 : T/ f.
This is g.:norally in ext n s o f t h e, '. e r.. 'j e ' u r n u p '; i r. h !ill
.s; in the rc :i o r.
It is ilso tha
- x it a for p uk r'
- r & nsity fusi.
It c ';/ r ' _ J.li t s a l' 3X 5:
'1 n, er3 t i r,g h j s to ry for c' 'C tur 'h I <y' it Cal-r ;1a tiens. - Ceal his tories w uld int Nce less d o:;y ha t 31uce the arious real shutdo':n md r e 'wed pcwr ci: cations - uld Lend the c
opara ting t i:r.e (not. i.e int jra ted h.cnup) ind r0 na L:m iinsion produc t i n, cn to ry.
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la h th naD Roger.]. httson
- 2 yy
' d '" 9 u b 5.
Decay 1. eat for 2 years operation with Pu/ M.
6.
Decay hmit c nc.ing that a t 2 years operition the ra tio of fission E m. e r 1 r v a W~. -h ard c,u2:_9 is one.
i bis is a r a np:.l e, u t c o n c e i v a t n. a n
u>
t ap,>rox1: ation.or,enis r uirum,ais, tory.
< 0r i e s.n u.,c..'n
. a i:e s o f. in-terest it is.lso a rm tonable 4 prox: atien to assu: e the final fission ratio has oco. red thrcughout the operating histor y.
The overall ef fect of this fissile inventory approxi: ation is ccr.cervatrce relativo to a real i:ecunkry, l irgely h >c. use t5.e M 9
- -r frm:tica st.pticn at ino jcars P; 1 :.w I.
The r.:L io u r the deciy h NLs fur the n:,
n ',m. r a t i: a in s t c ry af for i:il - 2.
n atir g i
>:ry '.n' n
' d !!a
'1 I - 2 I t is v:nci m'el ' t i t i f a i n: n ao
.nt, i:m
.r level durinj s H t
,.n t i: 's v.
ar a a Ju : 1 alting or i go couli hs/e incr?
d eh'ut 101, wi th ti e int c.
- e iuring 'he i - st s,nificant t n f r..e (chaut 3 heu.;)
< a t 61
'is iw co uld not i
,, n r t o '. ce a e, i i;.n i f i c a n t e f f e c t o n i h.: 1. ; e l he:d o f
- el elt.
s in %ciy 5 : t ' ' :ra is il sa,
- Ep. al
'or in-In
'iition to tr ie e
u-
- e in in 'ividual isof m inven tory fr-1 di.;,e d g eratien.
For L i m
'J :ul d he) " 'il a tile" dur i ng the c cs '. ':er?.aight be P opes ' li d e
en incr> se in c n'.c au t ' ': n to dos s f ra this ext >. 3d.. erati;n.
There irs to ! a nly a f' s igni fic int isot oy:s for ".nich th L is the case.
.g ' ' a. : ci m ' :luiins" (:ha n,ble e es nd iilc :ns) aly Kr f>S
(, und < ' : te),
.n f mj ;solq :s.ith toilir.g pints ;c :
i n ' a t
'crarring in ' O
. nt (,'out K 'O C) tnly Cs 13/ ini Se :0, wear to M sigrificant icn'.
m wi th h.ilf lir:s lcng co ired to to2 n'I - 2 e f i..c i. i v e s
or r a t ion tin-
- ,r tha ex '. :no d hi s to ry p ce. :, sly di: v
,.3, Le invent'r/
07 '. :se iso r on 's muld S. r.c i w mi by -0
>t r.n
' c oi
' He (i.e.,
XiO) over th a t e.:i T' a o tt ir ile -
mic cs u: al d r.o t he i nc e, ' t i ng Tc r M -2.
ed > igni ficr.ntly.
no of
,e tF.
a ms a ir to
' ave prirary facto rs in hi-2 do se ts u rv i t 1 t hs,
oi U. n _ h e i v. c. ; S v>uld not
'ar to 'o hichly significant.
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3 ird J..
-t i c n i ng s/
- iciar Jhjs ics Sec ti on roca per f m we '
- ch ai'eision or s c!iety i.c
V.
Stello K.
niel F. W i.c
':r J. /_9:
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fr k:co D. CrutchJiold D. F i.' o 6o 3,,
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D Decay iMat - Percent of Full Ic.cer 4
5 Shu tdo.. n ti:.a ( s econds) 103 10 -
10 (heurs) 0.23 2.3 27.3 (1)
D'I-2 1.92 0.918 0.433 (2) !'235 (infinite) 2.13 1.055
- 0. 35 (3) Pu239 (infinite) 1,92 0.9C3 0.550 (4)
U?35 (2 jec:rs) 2.0/
1.010
- 0. 20 (5) ru.,9 (P
. a rs )
1 S/
0.915
- 9. 97 (6) 501 (?)
- 50L (5) 1,97 0.9/3 0.503
(/)
'!t.o (6)/(1) 1.03 1,r6 1.18 t, n. a..,s s m a us r. s n u e c. m a n, u on reca
- n c i n n e ou r.1 u e n.
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$b MOOPM DUM FOR:
B1rl Pniel, Chief, Core Perfor..jance Brc, -h, DSS THRU:
Diniel B. Fieno, I eadar, P actor Physics Section, Core Perfor, ince Branch, USS FROM:
H. J. Ric hings, c ic tor Physic s Sec t ion, Core
'e r f o r, nce "ic:nch, DSS 50dECT:
DECAY Hi.lif FOR iMI-2 The encloced figure e.. s th21 :;st r< m ut ri:cul's of th' calcula tion of d= cay Lt :t for iMI-2 and shculd r< place any. lu's id in '%
past.
It differs fru pr :ncus cilcul f. ions pri: irily in L ving an incri cmd p-ir ogra ting his tory sc iral t onths prio-to ' he event (p :riod A in th3 fic,re).
This results in little cf.an;3 for the ca rlier dut ,cn t i s (s iral hours) hut rr ults in c i.t a 5%
- rc ise a t <c.cra l d 'js ' ' utdm;n, 10 a t a' qut a L ;n'.h a;. 3 up to i:
SQL a t
,..c plus.
4 The op '.rit.:-; :.'s t;ry i. M1 is b ased cn Ra inferiu ticn (ca 'a on folic !) in the d!-2 s'; ain it'.ry st art up rc yr t (3-P3-/9), plus the. s u ;; t i o n o f c o n s t '. n t M f. : r fo r R a l a s t f ', a. is f
c; :r.i L i on E ~ i on '. ir' a l c o c;nication,,ith iMI.
Tbrel is, o f ccurce, a s i.;>l i fica tion of L!a d ' iiled hic t ;ry, ' it So ;1d c
rqfesent int.;r.ited full p,. ir days with accurry suit ble for the calculation.
Thi calcula tions (.;hich era by hin f) use Re n.. ! J:uay I it infcr-e.ition :s w plied in 6 : 1st rev:nt dr a f t of th, nNS S ta->ird 5.1 (%,.N r 1913).
It usis this directly ruthir thin as a correction factor as, is done in previous calcul :tions.
The calcu3ation uS'id tia I!a fi n i te o," 2 ra lion da ta for 0,12 ra t i on v ^: F i r;d D for thatdo.0 tit.:s.jp to 107 c':cc';ds, and the pulso da ta i or gi ca ter shu t 'c n tie M ir.d for all of opraticn paricis A ind B.
The isoinpa fa. 3r fractions nd ac tinida pro <';c t i.;n r i to ce i:S tir i ted f f r.1 C. nJ ra l i h fo rc:' ti o n.
[h? i'o t e,.? c f fec t i s ' ill I
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,I li ttle ef fect.
The vlin ido
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( c-b u t l Y/. t ',:ral h,rs
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t f !. ' c.
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in its cat.
- iu s should 5 ill c.nd L':s tha :ctinid' contri'ution to unCtr'ciinty c!l'ild hP r, Q
, ire th.n l or 2 p^rC Itt.
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- The o.:rall ncur{ainty is estirit J fo 'm 5 to 10r (<s".ing no expl ic i t :-n or in the h.nd calcula txns).
Thn uncert.iinty in the nma 'MS d='a, r n.p" ring th: isoto,)e nix, is a$ cut 5f (2a).
The re T i r. 'e r o f t h ' ' w: : r t c: i n '.y i s f r a..: inaccuracir s in ti.3 op ra t in g history r: hl,ud fi < :a es t i 3 tes us ed in ti' l.ud calcula tions.
fL :se c.ca pro' '.; l y ',, : e.1 in a reiti.a dir ec tion.
Fce en.gle, th? [ 'l l '~> 3 l
, : s I ~- I 3. ', 3 l!. fr Ci;n l:r of
.3 o)~. 'lifig ? -r iOd,
,thich thould gi ce a slig uly ico large i. ult.
TLare h :s '
n ra c : r r-
'it : >
for fL2 ;-
- ibla lms of ", 31 tile" fi,ic,
a,
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As an en pie I.a ';0 cc :s pri. irily fro.a Ea I
l40 The I.a has a 7. day h g life, Ba a 13 day hilf life. At one day shutd*I.
ti.e I.a ccn tribu tion co:. ?s a s tly fr.:.a c to c.s
'thich '..are I.a 'g during th 2 high tr pirature regi:ra and th> re fore not vola tile.
At ba vc eks shutdown, hu,..ver, the l aI40 m. :s
- r. ;s tl y f rc.; a t t..>..ich '. ire Baldo during high t.
c'rcture, and i.hich rc;y in w:0 c ises h've b< un ".'ola t ile".
S i:.il.irly, m ~e o f the iod ina cont.riNtion co.as fre:a a to 's..aich., :rc telluriua during lii'jil t.
i,1. rc t u r e s.
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