Text

Decay Heat Removal Problems Associated W/Recovery from Very Small Break LOCA for B&W 205 Fuel-Assembly Pwr
	ML19241B296
Person / Time
Issue date:	09/01/1977
From:	; Office of Nuclear Reactor Regulation
To:	;
Shared Package
ML19241B297	List: ML19241B296; ML19241B300; ML19241B302;
References
	FOIA-79-98 NUDOCS 7907160005
	Download: ML19241B296 (57)
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~;.., '. ; :,. r:... u. 6...... ;.. a Q g. 1 o I ~ bat.-10074A, Rev 1_ Topical Report March 1976 MULTINODE ANALYSIS OF SMALL BREAKS FOR B&W's 205-FUEL-ASSEMBLY NUCLEAR PLANTS WITH INTERNALS VENT VALVES - Revision 1 - by R. C. Jones B. M. Duna C. E. Parks SABCOCK & WILCOX Power Generation Group Nuclear Power Generation Division G55 93 9 P. O. Box 1260 Lynchburg, Virginia 24505

SG{ Revision 1 (10/30/75) Babcock & Wilcox Power Generation Group duelear Power Generation Division Lynchburg, Virginia Topical Report BAW-10074A, Rev 1 M. arch 1976 1 For B&W's 205-Fuelysis of Small 3reaks Multinode. Anal Assembly Nuclear Plants t With Internals Vent valves -- Revision 1 R. C. Jones B. M. Dunn, C. E. Parks Key Words: Multinode Analysis, Nuclear Plant, Small Break ABSTRACT 5.': i / Hultinode analyses were conducted for several small breaks in the reactor coolant system of B&W's 205-fuel-assembly nuclear plants with in-7 ternals vent valves. The multinode blevdeva code CRAFT was used to evalu-ate the hydrodynamics and transient water inventories of the reactor s-coolant systen. The FOAM code was used to compute, a swell IcVel history. for the core, and the THETA 1-B code was used to perform transient fuel pin ther=a1 ' calculations. Curves showing the ' parameters of interest are presented. These results are well within the Final Acceptance Criteria. 1 r o e e O l I 4i I '555094 l L l - 111 - Babcock & Ylilcox

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....... ^..-...- . ( ~ :.. 4 *...,..:...-i..... p -.o IJ N w 1. INTRODUCTION This topical report evaluates the effectiveness of the e=ergency core cooling systems for BW's 205-fuel-assembly (FA) reactor designs with the following features: Eight 14-inch-diameter internals vent valves. 1. g k 2. Cross-connected LPI syste=s. EPI system manifolded into each cold leg. 3. The plant is assu=ed to be operating at 3760 We, and the analysis 0 . -i is conservative for plants of similar design operating at a lower rated The analysis is also conservative for plants of similar design power. with Mark-C design fuel assemblies. The report presents the results of an analysis of loss-of-coolant. (f:ij accidents resulting from s=all breaks in the reactor coolant system. [ (Small breaks are defined as those breaks in the reactor coolant system 2 leak area.) The CRAFI,I FOAM,2 cud TRETA1-B3 con-with less than 0.5-ft O puter codes were used for the analysis. - 2 A spectrum of rupture 3 is considered: 0.5, 0.3, 0.1, and 0.05-ft Also, the report includes the double-ended rupture of the

7 leak areas.

2 leak area). These ruptures provide an ap-gCi core flooding line (0.44-f t propriate spectrus for evaluation of the effects of small leaks. TA El <2@ s 555035 6 S 1-1 Babcock & Wilcox

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~' .53 Revision 1 (10/30/75) i ~ 2.

SUMMARY

AND CONCLUSIONS The spectrum of small breaka analyzed in section 4 shows that the cladding will undergo only a moderate increase in temperature during emall loss-of-coolant accidents. Because the peak temperatures are low. no potential for cladding swelling or metal-water reaction exists. There-fore, the core geometry is unchanged and will re= sin a= enable to cooling. Long-term cooling is established once the injection rate matches the leak rate and the core is covered with a steam / water mixture. l ' The double-ended rupture of a core flooding tank line yields a maximum cladding temperature of 1636F. Core geometry will be maintained in a coolable configuration. Long-term cooling is established by using the same reasoning as in the paragraph above. For all breaks analyzed, the conditions of the Final Acceptance Criteria are met. Corfor=ance of this analysis to the Final Acceptance Criteria is demonstrated in Appendix A of BAW-10104, Revision 1.8 There-1 fore, the design of the emergency core cooling system is adequate to con-trol small loss-of-coolant'accidedts. - Results for the breaks considered are suc=arized as follows: Initial Peak Time at Ohich long-term Break teen, F teep, F cooling is established, e i 0.5 ft2 at pu::7 disch 710 1178 200 0.3 ft2 at pump disch 710 710 400 f 0.1 ft2 at pump disch 710 710 2200 0.1 ft2 at pump suct 710 710 2550 i 0.05 ft2 at pucp disch 710 710 2300 0.44 ft2 CF line break 710 1636 400 CD D Oq-.W t 2-1 Babcock & Wilcox t

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sv Q /*, At 280 seconds, two phase fluid flows,Irough 5 seconds o the accident. / the break and r uits in a more rapid depressurization cf.the /eactor p s the becai at the discharge. this effect occurred at coolant system. 200 seconds. After t s time, the break at the suction depressurizes / [ faster than the break at e pump discharge due to, higher quality fluid y[ exiting the system. The cor flooding tank act,ua' tion pressure is reached / ..l at 7?$ seconds. At 1300 seconds, the LPI p cp begins to inject water to W se in the inner vessel inner i the reactor vessel, resulting in an c v stops at 1390 seconds after volvme. The r.uxiliary feedwater pum t {4 l the break cccurs and causes an i rease in he system pressure. Long-term cooling is established 2550 seconds. e core remains covered by a two-phase mixture th ughout the transient, d no claddfng tempera-ture increase will oc r. Y( ted frce the As was show no major differences in response res The icwer pressures that occur durin'g t suction change of loc on. Therefore, small b .ks at fr break resuJ in increased pumped injection. the pump # scharge are considered to be slightly worse than treaks di the p' ump suction. j 4.7. 0.05-ft2 3reak at Puno Discha_rge, t break at pump discharge is the smallest break analyzed. 2 The 0.05-f t 2 break at This break responds basically in the same canner as the 0.1-f t the pu=p discharge as shown in Figures 4-31 through 4-34. The reactor I trip occurs 8 seconds af ter the break, the auxiliary feedwater pump sht.rs 3 off at 1520 seconds, the core rer.ains covered by a two phase liquid I 9 [ throughout the accident, a:'d the cladding temperature never exceeds its j m i The results for this break show that the HPI pu=ps alone t prebreak value. are sufficient to hancie breaks of this size and smaller since the core flooding tanks inject water for only a short period of time and thus play .] an insignificant role in controlling the accident. L L ODD ()S'? l. .y ir Babcock t.Wilcox i 4-5

I .) [ l Figure 4-31. Core Pressure for 0.C5-ft2 Break at Purap Discharga 2500 l -(( l a 2000. 5 2 1 a. f 1500 M 1000 s i m 500 no K tq 0 500 1000 1500 2000 2500 3000 ~ 8 m en s ime, s x 9 -3' 25 m C.o a M % i $} .I

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.......'.....a ~- ~ .o SG n J 1 2 Figure 4-34. Inner Vessel Liquid Volume for 0.05-fc Break at Pump Discharge f 3500 1 3000 2500 I La.

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