ML19259C527
| ML19259C527 | |
| Person / Time | |
|---|---|
| Issue date: | 01/08/1976 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19259C524 | List: |
| References | |
| NUDOCS 7906230145 | |
| Download: ML19259C527 (5) | |
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TOPICAL REPGRTS E'/'LUATf 0fl TOPICAL PEPORTS SU*?fAP.Y_
The' topical reports evalustud in this review present results frca small break spectrum '(At. 0.5 f 2) analyses for BMl's 145II),
177(2), and 205I3) FA plants with internals vent valves.
The three reports were reviewed jointly because they use the same s=all break. odel to perform the small break spectrum analyses.,
The small break cod'el c:nsists of the three c:cphter pro-grams discussed belew used to analy::e plant response to small breaks:
- l. 'CP.AFTI4): A.$ltir.:derepresentatienoftheplantpricarysystem to ccepute' blowdcwn hyde: dynamics and wattr invent:ry in primary leap components fellcwing piping ruptures.
2.
FOM(5): A single node representation of the'c:re to c::pute aversge two-phase mixture height in the c:re hhen c re un::very is c::puted
. in the hetaregonecus. react:r inner vessel volume of the CRAFT medal.
3.
THETAl-B(5): A cul'tinede representaticn of the c:re hot p'in fuel
' and clad to cmpute ter;erature transients'duri.ngthe loss-of-c:olant I
accident up through c:re recovery based en average c:re c:olant con-ditions determined in CMFT and FOM.
The multinode plant representations in C."tAFT for s=all break analyses typically contain approxi=ately half of the nedal detail used for large break studies ( ~15 c:mpared to ~30). The r:duced medel has bcen shown(7) to provide results essentially identical t: those of the large break : del when using identical assumptions, due to the reduced bicwdcwn rates and internal pressure gradients computed for sma11' breaks. Most of the ncda
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JAN. 0 (3:07c; detail reduction is made by lue;fng the two pri. ary Iceps sieulated in the large break model into a single leep, and by lumping the reactor inner
' vessel regions of cere, c:re bypass, upper plenum, and upper head into
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In additten. to the nedal reduction, sc=e large break a ' single volume.
analysis assumptions im;osed for conservatism can be rela'xed because of These changes are:
.the sicuer bicwd:wn of the small break.
iormal system low pressure react:r scra= is included.
1.
2.
All injected ECCS wat:r is assured t: enter the dcwnc:mer No c:nservative and is retained in the CFAFT calculaticas.
removal of this water at the end cf blewecun is used as
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in the large break analyses.
A heterogeneous inner vessel vole:e is :: deled for the small
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Dr$ak in CFAFT c:cpared'to the hem:ganccus volu s codelad Si u
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for the large break analyses.
Results obtained fr m the t:pical reports fcr the small breaks censidered for each plant are su= art:ed in Table 1, and shew that
'ad hot spot taq[eratures in ar.y of the three plant types analy:ad
- peak do'not approach 2200 F.
TOPICA!. REPORTS EYl.!.'JATIO1 The small* break medel pregrams used in the analyscs in the three Veports reviewed here were evaluated in previous assessments for large break studies in the cases of CTAFT and THETAl-0, and the FC.'ll program was evaluated in the review of SAU-lCC64 A;pt,ications 5: 5. ~.
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$3 JA*L o a 1974 of these pr:grc s in the small break analyses reported in the topicals were performed in a canner which provides se=e c:nservatis: in the calculations of peak clad temperatures; hewever,.an assessment of the extent of this conservatism was not sought because the tempera-
,tures obtained were Icw cc: pared to damaging temperatures._
Frec'the results su==ari:e'd in Table 1 it is noted that the analysis fer thcl77-FA plant with raised 1: cps 1did not include the core ficoding tank line brcck.- The*intreductionofthere;:rt(BA2-lC075)(2l for this plant indicated that the results of the analysis for this break i
2 would be presented in the SAR for each plant application. The 0.5 ft break for this plant was also indicated in the introduction to be re-l I
portedinCAN-iC053(3)., As this. report presents results for a 177-FAnen-vent valve plan't using tha large break :: del for the break analyses. :.
2 is censidered that the 0.5 ft break for the177-FA plant with raised loops and internals vent valves has been adequately censidered. The value shewn in Table 1 for this break is c:nsidered gr:ater than can be cen-servatively expected for a small break medal analysis when c :;ared to' 145'and 2CS-FA results.
REGUIATORY 705ITIO.*!
Referencing the appropriat'c report of the three topicals evaluated in this review will be accep;able for sciall break spectrum analyses for SARs with the exception of SARs for 177-FA vent valve plants with raised locps which require additional d:cumentation for the CFT line break.
The : dels and programs used for the s:sil break analyses in these topicals predate issuance of Appendix K of 10 CFR 50, but are c:nsidered in confor.r.ance to the requirements of that rule.
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.. ' 06!I PLAflTS: Sl'ALL 1:RE/.X SPECT?'J:1 PEAK CLA0 !!OT 5F07 TE"PC.t.~URT 0F 177 FA RAISED 2
Break Size - ft -
145 FA
.LCOP 205 FA (Vue.p 01:cnargc)
I3)
'1196 1533 0.5 1178 0.3 1030 1090 710(2) 0.1
!.C. II) 700II) 710(2)
!.,C. II) 710(2) 0.05
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700(2) 0.04 -
(PapSuction)
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824 0.3 r
I.C. III 710(2)
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0.1 (CFTLine) 0.35 760 i
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0.44 a
1636 t
i NOTES:
6 (1) - Initial candition - not specified (2) ' Sac:e as inttial condition l
(3) - From Referenca 8 CFT - Core F1ccdtng Tank 2.
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R:2MC C. E. Pad:::, n. J. Allen, and L. n. Cartin, ":Mtin:M: 7..21ysis of' Small Drc2a, Er nel'.s 145-ra:1-7csebly :'ucien: Pire.:s With Int:=:ls 1.
Vent Valves," c1*:~1C052, Cctch:r 1973 -
L. R. Certin, J. M. :lill, and C. E. P :ks, " M1:inod2 te..ly::is of s-all crc.f.s for DCJ's 177-Tecl-lase:::ly :Melec: PL nts with re.i:cd 2.
2111-10075, Deccerter 1973.
l Imp A.re.nger.r.t and, Inte=nis Vcnt Val *;:s,"
R. C. Jones, S.
- . Dann, nd C.' E. Parks, "!ititired: Ir.:!ysis of S.-all Dre:.'.:s fer BCi' c 205-PC::1-A::=hly IMcle;r PlLnt I:ith Inter:'218 l
3.
Vent Valves," DK?-10074, Mcvc::b:: 1973.
"C~'?~" - D100:iptica D. E. Einsh:m, h'. L. Jcason, r.r.d R. A. !! dric't, of Fcd::1 for T.:-ailibri's. ICCA le.Alysis Prog::r.," 2.i; -10030, Cctci:cr 1971.
4.
D. M. Dann, C. D. !b.c;an, and L. R. Cra tir., ":Mitinc:~c An:1fsis of Core FlecdinJ Li.r.o 2 ::.:h for BC!'s 25%-Mit Intru:.ls Vcn Vcive Plants,"
5.
BN1-10054,10:i1.1973.
C. T. !!ocevnr, c.nd T. W. Wine.inger, "br"Al A Caq: uter Crd.a for G.
IN:1 car Teabr Cerc 'O:scr.:1 Jc.slysis," I:~-1445, Fctru.1:y 1971.
C. E. Parks, 3. M. 04-n, and R. C. Jones, " :lltfr. eda Jr.c1', ric of
- 7..S2.211 Bref.s f.cr 34W's 2568 iHt Nc-*r ?lants," TI:-lCC52, Septr:b= 1972.
C. E. Par':s, L. R. Cartin, tr.d 7 C. Shich, ":'.altined: An lysis of 8.
Dt.W' c 177-1b.1-!csrbly, Sen-Ven: Vcive Plant Ocnn; LO 7.," 32:-10053, June 1973.
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