ML20024C577
| ML20024C577 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 12/11/1978 |
| From: | Rosalyn Jones BABCOCK & WILCOX CO. |
| To: | Cartin L BABCOCK & WILCOX CO. |
| References | |
| TASK-07, TASK-7, TASK-GB GPU-0330, GPU-330, NUDOCS 8307120830 | |
| Download: ML20024C577 (3) | |
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1 I, - TEE EAE003 & VILCOI 'C01:PA!!Y P0iiEF. GENERAil08 GF.00P To l L.R. CAT.TT':. TN"ICUTTO't ~ fft ans 443.s q R.C. J '"!S. T :S A*:ALYSTS (M66) NO. W.o., . h a t. F.le No.
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Presently approved a-211 break anslyses have all been performed assu=ing
.that offsite pcVer is lost coincident with reattor trip. This results in ;
tripping of the R: pu ps, catuatien of auxiliary feed ater..and control of tha liquid level on the secondsry side.of the S: at hi;h levels. , , Should offsite rever rc=:in available during the transient. tts T.: pu=ps vill re= sin povered and the ICS v111 co= trol the setendary side vuse level to a;proxt=stely 30 inches by throttling the =ait (or auxiliary) feedvater . control v:1ve. Seesuse of the i=pertssee of ths 5: vate: Icval to titig tion of small breaks. I:03 recc= ends an ar.alysis of the I. pu=;s ;ciered .csse. 1= caki=g this reco=6ndation. ECOS has perfer=ed . revin to deter =ine i vhat previcus anslyscs are available vita the ?.: ;u=;s p:vered a=d also has z.ade t.n cegineeri:3 assess:c:t of what vocid ha;pe= u=dur this situatic:. Eo previcus analyses could be found. Eovever. it is e.=;etted that if any were perfer:ed, they were not de e at break sites of ir.terest. *'ith . the 7.0 pu=;s pcvered, it is expected th:t nat.:ral circulatica vould be c.in-tained for a longer period of ti=a and woule side systc= depressuritation. , Also. =aintal=:nce of the syste: flow would decrease ge: sfter reactor trip and would result in a lover pressure for systa= flashi=g to eteur. P.ovaver, ' these positive influences would be offset by the decreased ability of the 5 to condense stes:n. following the loss of natural circulation. due to the
.y lover SG Icvel control. It is also expected that, with the RC pe=ps ru:ning.
' ' T a *stess pocket" will -ot form in the cold le s a=d lower quality fluid will exic through the brcsk sad thus sherten the ti=e for the systas to reach the
" boiling pot" ode of the transient. An unk: .n factor at this ti=e is
. Whether or not the stesa generated in the enra vill separate in the hot leg .
U-band or be carried dom into the 50 and cesfensed. This =ay be an i== portant factor for showing that the F.C pu=ps : ning case is better than the present assc=ption of tripping the RC p.- ps. 1:03 preposes that the i=;act
. ~[* j, of this phenomens be exs=ined in.a sensitivity study.
As illustrated above. it is not obviously clear thtt lesving t'e RC pu=ps . ,
- running results in an enhanced.ECOS situstior.. hus. E005 reco==: ends an .,
analysis be performed to ex.uine this case. ICOS proposes that this enslysis be run on the 205 TA plants for the fellowing rc:scas:
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- 1. no prcrent 20$ TA small break topical (M/.10374) assuses he:t re= oval typical of that for the U7 TA plants. nerefore, a ce=parisca of tha 4 pu=ps es case to BALf=1C074 vill provide an asse:::ca: if the imp:tt on -
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) 2. nere presently exists an TAC model on :he ~25 TA plants. '
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- 3. no nev !: =odel in C7.A?T has been exercised on the 205 TA plan:s.
9 nis s=dc" :.oro properly acccu.ts for 10 perfor===ce during the tran- , sient ic- the 205 TA and YZ?co plants. Cc=;aris:s cf the pu=rs c: case
- to recen: 233 TA plant studies will provide infer =stics cc :he 1 ;act '
for 20$ TA and YEPCo plants. , It 1: expected that this work ec.ald be scheduled is:e the ICCS Uni verkload
'. tav because of slippass in the Nr.C ssall break ::andard pr:ble= and the "C3 -
; TA stall bre:k verk. It is esti=:ted that this verk vill require.303 =h est to c: hrers and a s;:n ti=e of 3 months. ::iru shsh vill he the ce:-
tt : in I"*5 fer this i: sue. If a:y questicas tri.so, ple:se c:::a:: hi=, - or call se on extension 2066. 4 T.~J/lc .~ I . e:: 3.M. ::::
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