ML20125D885

Data on RCS Pressure Transient for Electromagnetic Pressurizer Relief Valve That Stuck Open,Causing Small Break in RCS Piping

ML20125D885
Person / Time
Site:	Davis Besse, Three Mile Island
Issue date:	09/24/1977
From:	TOLEDO EDISON CO.
To:
References
TASK-TF, TASK-TMR NUDOCS 8001170675
Download: ML20125D885 (3)

Text

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RCS Prenure At Time 'of J(pIJtart. ,

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@ilsLanalystalincorporat ed the inattument accuracien and setpoint driftn inherent in SFAS or.tuation. Total SFAS nt ring inaccuracy including drif t in 50.75 psig.

"the setpoint for llPI initint.iua in 1650t25 pnig hot leg pressure. Therefore the actual preocure at Reactor Coolant System (HCS) , hot, Jeg pre! sure tap may be in rande of 16501252 50.75 f.o. 1575-1725 pulg at the t ime of itPI initintion.

Since t.hc HPI pwnps discharge into t.he cold Icg of RCS, t.he' core pressure drop and the static prunnure due to difference in elevation of hot icg and cold 3rg must be consider.ed,. The core prencure drop with all four Reactor Coolent Pumps running, is approximately 100 peig und the static prent;ure due to dif ference in cicvation amounts to approximately 20 poig at t.ypical RCS te2nperaturen and presnurco preva-icnt during a few minutes af t ur llPI init intion. This yieldn a correction factor of 120 poig to convert hot Icg prencuren to cold Icg prencure at HPI connection, with cold Icg precr.ure being higher than the hot. leg presnure. Accounting for the above correction f actor, t.be cold irg prennura range within which SFAS will act uate the HPI pumpn in 1695 to 1845 pcig.

RCS Deprer sur,1,ryt Ion Rnt LA f rnt .11PI_S t art;

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To nid in t.his analysin,7{ data 1from the[5eptembhr[24,[$9771deprent.urization transient was analyzed. This data reprenents a very'small break in the RCS piping caused by the prennorizer niectromatic relief valve being ntuck open, and is a conservative representation of n nmall RCS break 3cading to HPI initint ion with n very low deprensurizat. ion rate. ,

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.r w + , eroi ,,.u gle'astisquares ; approx.im'ation?wat ma~def onfthe SeptensberL24fl9771RCS .prensu(ef to obenln the rate of RCS deprennurization during the time range of approximately Thin rate was eniculated to bc 3.4 pal /sec.

1.25 minutes af ter SPAS Init lation.

decreasing.- Figure 1 depictrot.hin ut.raight. line,depressurization curves start ing nt 1845. and 1695 puis. { Figural2/sfiowsfthe1HP1lpumpmheadicurve4 _It in cvident, Jrum Figure 2 that HPT flow would at t nin the \ minimum recticulatilon) flow?ofJ35 spm!

perj pumpjut a cold leg prenuurn of' 1680 psig. Figure 1 shows that this, cold Irg pressure of 1680 psig is reached anywhere between 4.4 secondo to 48.5 secondu af ter SFAS actuation depending on whether the SFAS actuated nt 1575 psig or 1775 psig hot 3cg prennurn. If 'the four reactor contant pumpn wern of f , then the minimum recirculation flow would be reached f rom time zero t.o 19 ncconds after the pumps were started dependi,ng on whether the SFAS actuated 'at' 1575 psig or 1725 psig hot leg prescure. .

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