ML19220A358
| ML19220A358 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/21/1978 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7904170464 | |
| Download: ML19220A358 (4) | |
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' tne Safety "_v3:.atiu ;. ;rt of tne
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~ S ee **ile ~slar Unit 2 I';ket Nos. 50-320 Environmental Oualification for Main Steam Line Break Analysis 6.2.1 "nalyses of po:t > lated rain steam line break (MSLS) accidents ed by the staf' and several applicants have predicted contairu m: ;:
te.aperatures, on the order of 000 F, than higher cal;ul?,i cc c ta i r.ren t
- e e.,
roi.
ital cualificatico testing c~ safety relate:
..ere usea ir T,s a result, there is : generic c:m:cen regaraing tne ecuipment.
tne accident capability of safety related equip ent to remain operable in line areak inside envi ronm.ent
'..h :n uculd resui t f rom a main staa i
Ho.e.er, it has been recognized Dy tne staff and noted ccntainment.
i in 7,JREG-0153 th?t the nethods of analyses approved today conta n Specifically, the staff has re uired analyses significant c:"sarcatisms.
based on an instintincous double ended steam line rupture with tne tions assumptions of dry steam blewdown and using ccnservative assump i
for minimizing c;ntainment heat transfer coefficients with a conse treatment of the therrodynamics of condensate behavior.
The applicant has crcviced an analysis for a main steam line bre d in a peak accident postulated to occur inside containment which resulte For this analysis, the are temperature of c36 F.
calculated atm?',
dl applicant has used a steam generator mais and energy release ccrresponding to dry steam bicwdown for an instantaneous d the applicant has assumed that all of the liquid In addition, rupture.
forred cn the heat sinks due to condensation is transferred d t
the sump without any revapariz3 tion to the containment envircnne Orr OfiO
These conse cati.n
-, ations tend t o raxinn ze *.ne conta ir..,ent a tmos phere tr-rir+ 3 tur e calcul a ted,
r ~ monent br:a t ra ns'er calculations nerforred b:. t'e spa'. icant.ere
- , sed tc justif the Wquacy of environmental g.alification te: ceratures a ngina fro-y ro at31y 290'F to c50'F.
The resul ts of "ese analyses indicate that the cerponent thermal resconse will be less than the peak t<nperature to '..hich the ecuipment has been enviror.nentally qualified.
have per#oered a best est?, ate evaluation of the containrent response
'n to an "SLB m ;ideat for this plant using a odel developed for this Our analysis included the r. ass ar.d enercy release calculated rurpose.
by the apolicart and partial recanorization of the cor.;ensate ^.rned on the contai co' heat sinks.
The use of these input data resulted in a calcula%d ceak contair. ment atmaschere tc cerature of about 4/0 F, exceedina 290*F for approxinately 80 seconds.
In addition,.ve have estirated a 25~F or " ore temnerature reduction fecm that calculated in the containr ent reaien t.nere the break is located for those ecuipment locations serarated by walls, floors, and large dictanc-- (i.e.,
diametrically err,osed locaticos).
e have aise perforred therral analyses for scme typical car.pcr.ents needed to mitiaate the consequences of a i'5LB accident. Our results the oaat environmental qualification tenceratures are very near
,,_ r r s (in
-~
-1 iovied by '
v'ic nt for :: e enui: ent.
':e have concluded tr.at the applica'.t'n
_Mivsis and the environmental cuali'ication terforned, confirm-1 E-
. v r.n aralyses. ; rtvides ecasonable a ssar ince that
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-'t
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- 'r';ir-d functional ca.m bility in the ich t 3 n r. r a '.c n -'-' air -2nvi r'.rmn t a ss c i it'd, i tn a
- t tuli t-i
'? inside -
m.t at:d are iccc.::ble.
Ihe use Of Cr~
rt thor"3l 3ndlyset and ssrciated Ec3t transfer coefficientr.
' > criite contain :nt inalytical odelinc, and a.ceptable i r>'Nds o' accident nnvircr ental simlaticn for equip rent al i fici t,.n w e>
d e csr.eric revin.v by 'So staff.
'lc e,5ect tha t
- thin apprn<'
4 t rJ.,
<"e yrir our review of these its's will be t - pl ete, t ec ul ' : ca in the develo;. rent and irplcrentation of a consistent r,et cf e.n/irennental cualifica icn re::uirements for all plants.
If 'hese recuirements necessitate additional review of the tteam line becn eneirecrental qualificaticns for this plant, we will consider such revice-a t tha t ti a.
In the interim, te ~rn cc.rpletely docurent the analysis cerforced, we till rer;uire affitional infomation frcn the applicant recarding the
":ectrur. of bre1H analyzed to obtain ehe ';cest case and th e therr.al analysis rodels and awrotions.
This infcrration is not expected to
fect the iesults of 'he 2. plicarit's cr 31ysis or eur evaluaticn
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