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Inquiries about copyright and reproduction should be addressed to : Technology Management Section ,0-arai Engineering Center , Power Reacter and Nuclear Fuel Development Corporation 4002 Narita-machi, O-arai machi, Higashi-Ibaraki, Ibaraki-Ken 311-13, Japan

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PNC TY9601 98-002 MARCH, 1998

The Basic Research on the CDA Initiation Phase for a Metallic Fuel FBR

Tohoku university Go fflRANO, Naohiro HIRAKAWA PNC Ken-ichi KAWADA*, Hazime NIWA*

Abstract

A metallic fuel with novel design has received great deal of interest recently as an option of advanced

fuel to be substi tuted MOX fuel, however, the behavior a t the transient has not been studied in

many aspects. Therefore, for the purpose to show the basic tendency of the behavior and released

energyat CDA(coredisruptive accident) for a metallic fuel FBR and to prepare the basic knowledge

for consideration of the adoption of the advanced fuel, Tohoku university and Power Reactor and

Nuclear Fuel Development Corporation have made a joint research entitled" The basic research on

the CDA initiation phase for a metallic fuel FBR ". The results of this year are the following.

( 1 ) Target and Results of analysis

The accident initiator considered is a LOF accident with ATWS. The LOF analysis was performed

for a metallic fuel 600MWe homogeneous two region core a t the beginning of cycle, both for an

ordinary metallic fuel core and for a metallic fuel core with ZrH pins. It was necessary mainly to

change the constants of input parameters to apply the code for the analysis of a metallic fueled

reactor. These changes were made by assuming appropriate models.

Basic LOF cases and all blackout case that assumed using electromagneticpumps were analyzed.

The results show that the basic LOF cases for a metallic fuel core and all the cases for a metallic fuel

core with ZrH pins could be avoided to become prompt-critical, and mildly transfer to the transient

phase. It is shown tha t the moderator is quite effective to mitigate the accident a t the initiation

phase. However, it is necessary to analyze at the transient phase to know if the re-criticality is

totally avoided after the initiation phase.

( 2) Inprovement of CDA initiation phase analysis code

At present , it is difficult for the code to adapt to the large material movement to in the core at the

transient. Therefore, the nuclear calculation model in the code was improved by using the adiabatic

space dependent kinetics. The results of a sample case, tha t is a metallic fueled core a t the

beginning of cycle, show this improvement is appropriate.

( 3 ) Conclusion

The behavior a t CDAof a metallic fueled core of a fast reactor was analyzed using the CDA initiation

phase analysis code and the knowledge of the important characteristics at the CDA initiation phase

was obtained.

Work performed by Tohoku unuversity and Power Reacter and Nuclear Fuel Deveropment Corporation

PNC Liaison : Ken-ichi KAWADA, Nuclear System Safety and Reliability Research Section, Advanced Technology Division

" Nuclear System Safety and Reliability Research Section, Advanced Technology Division, Power Reacter and Nuclear Fuel Deveropment

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1 1

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2.5 3.0 3.5 4.0 4.5

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11

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Bn 270

6.1

75

0.5

7.1

100

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8.80

1.65

14.77

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4.0

15.59

35.8

39.4

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127

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0.4

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130

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49.8

31.9

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1600

8004

4

30/42.9

18/39.1

36/34.8

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4045 (50.5)

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18.18

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32

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35

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39

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40

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P'bW\M.'& ftM/ftM [mm] P'bM £ [cm]

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4-2 WLmw&tia&mmftp<k<DLOFmift

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0.749

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0.383

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12.08

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10.31

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44

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144.83

16.39

16.35

0.876

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4.21

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20.41

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3.64

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45

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60

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61

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242.03

3.54

3.51

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78.64

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63

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TIME(S) Fig.5-5 nmmmtx:(DKfc&(Dnmmt

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TIME(S) Fig.5-6 &ffiM1k<DRfcfe<Dftmmt

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%4mizis^x, Ki&i&m&.<Dft±$:B&}bLizmmm-hn&mBMp'bizttt&ULOFm m^ft^, m3Mb<DkmAb, mmmbmnMiz^^xmizft^fzo ttzAgtmu^mu izx y)p<bmm9-&£w&tz*siimiz'D\J^xi>mi£ft-3izo -g-ois^, &.m.#<Dmmzx >>, p'b&fcftvmML&fetf-kisizm®ztizzb, ^mmm^mLOFtfm.&#<omNzx ^ 4 1 # 4 L W ^ S * t 4 4 LOFM':: $ T f ! ^ 4 i i i i t ^ ? *i£o $ tz, PAm\%* 0® t4nJfgttdo^TiijrLl:*^B#FB^?i0.o#, #--^-^-StS:i*15%?tiSt?^4^-C2btL tf, ( ^ M l / V f t l ^ K i ^ i i: 4 <) PA^\zm.b^mt^-i>m^Zbi)^ZAtZo

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67

&±<DZb&b. &mBMP>b(D&mmxx\i, S * ^ 4 4 L O F mi^-m.ftm 5.0m & m&ztiz>(Dx&tu£, Hz, mmmMik^BMP'bv&^mzxii, ^n.m^t^MLOFm i:#*n#ffflo.5S?) T ^ o T t , m&^izmzzb%<,m^frizmftmi^wfttz>*jm&tf te^zbtfTfrzixtzo iztzL,mmmm&vj$&w^nmiz<D^ximmmmmtf£^x * 4 0 ifc&ttmn<D®%:b Lx, p'L<m.W&tfzkift\zffiaZixz>zbiii7FZiilz0

68

1-1) mmw. "&mBMPAizisi7 &%£im&<vttmbuw\m73*&ffiftpmj£T92oo7 1-2) Theodore H. Bauer et al. ' "Behavior of Modern Metallic Fuel in TREAT Transient

Overpower Teats" ,Nucl.TechnoL, 9 2,325 (1990)

1-3) ^m 4fi: u&mM&&mpiz£i7zn?&R&&<D&mmmzMt&GtR" , MTJP- m. BMffi^^m^W PNC TY9601 97-001 (1997)

2-1) M&TZ^ "&mm&PX^" (1993)

2-2) Peter H.Royl e t a l . '. "Performance of Metal and Oxide Fuel Cores durting Accidents in

Large Liquid-Metal-Cooled Reacters" , Nucl.Technol, 9 7,198 (1992)

2-3) M.C.Billone et,al., '. "Status of Elemet Mogeling Codes for Metallic Fuels ",Inc. Conf.on

Reliable Fuels for Liquid Metal Reactors,Tucson,Arizona,Sep.7-11,1986

2-4) J.H.Kittel.et al., '. Nuclear Engineering.ang Design vol.l5(1971)373

2-5) Jt^JSEffi : "&mm&MVf=>-YALFUS<Dm%" tt*$Mftffim£T92095 2-6) G.L.Hofman,L.C.Walters,and T.Hbauer: "Metallic Fas t Reactor Fuels" Progress in

Energy, Vol.31,Nol/2,pp.83-l 10,1997

3-1) mmm, m*\m, mtf7A& : "&mBmmmmp<Dmttmi—&m&, ^ ^ s s r i i * LizPA<Dmt—" , WTJ^&ffifipJrn^ : T88043(1989) 3-2) Nakagawa M. and Tsuchihashi.:OSLROLOM:A Code,for Cell Homogenization

Caluclation og Fast Reactor", JAERI 1294(1984)

3-3) T.B.Fowler,D.R.Vondy and G.W.Cunningham:"Nuclear Reactor Core Analysis

Code:CITATION",ORNL-TM-2496(1969)

3-4) SRS&, ^ E B & # , j ^ s m : "M&pmimnn7v9'yA -2 {2%.%- 3>Ajtmm Simft 'S"3- K) : PERKY" .JAERI-M 6993(1977)

4-i) &*mx: "&mmmizxz&mm&i%&wt}p<oK&3£%&<ofa±Kwtzmft'' M 7 %mt ±m% 4- 2 ) Coffer C. O. et al, : "Charahcteristic of Large Reactivity Insertions in a High-performance

TRIGA Uranium-Zriconium Hydride Core", proc. Symposium on Nuclear Engineering at The

University of Arizona, Tucson,1965,p.398 (1965) 4-3) EJII »ifi: "jvpiTERmmmm^mippAmt^^Kw , H*I&=F7J¥& 1990 ^ C 0 7 C # i ^ f i f t , D37 (1990)

5-1) Karl O. Ott, Robert J . Neuhold : "Introductory Nuclear Reactor Dynamics" , American

Nuclear Society

69