ML20024C577
| ML20024C577 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| 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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~' c,. -2 =.r. =.;: v ~' - > " ~ ' 1 I, TEE EAE003 & VILCOI 'C01:PA!!Y P0iiEF. GENERAil08 GF.00P To l L.R. CAT.TT':. TN"ICUTTO't ~ fft R.C. J '"!S. T :S A*:ALYSTS (M66) NO. W.o., ans 443.s q ,t h a t. / F.le No. .l tr Ref. Att 3U3). Late .? j SP.S.tt S*IAx A':ALYstS t*ttu t: P'.*f?S 70' ?23 .trer'stR 11.19*! , ll g a. ~ 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: ,k i 4 L p.x. 4%e 3 3 0,6 p.~ o*s -7. M / a50 hghs i p b JA DunYo + -. - - - - - - -. - -. - - ~. - - - -. _... w. : =. .. ~.. __., i / 6 .? ? 01: li;;, o - e-s t ~ u :. j & Q 7 --..:-~.. _* m
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