ML19241C101

Discusses Addl Info Which Confirms Conclusions Re Core Pressure Drop for Natural Circulation Calculation.Graphs Encl

ML19241C101
Person / Time
Site:	Crane
Issue date:	04/09/1979
From:	Bartells P BABCOCK & WILCOX CO.
To:	BABCOCK & WILCOX CO.
References
NUDOCS 7907260674
Download: ML19241C101 (9)

Text

{{#Wiki_filter:1 THE BABCCCT T WTI. CUT UCVMT POWER GENERATICN GF. CUP hekb bl b / bl l DISTRIEUTICN Q j 6 '/ To f/ p Fres P. S. BARTELLS, TECHNICAL STAFF mu Cust. File No. hd or Ref. TMI-2 Suoj. Date CORE PRESSURE DROP FOR NATURAL CIRCULATION 3 p g 7 7, o, ,a 3 c u em 3-r m. ga..i............................... DISTRIBUT!CN E.A. Womack C D. Morgan C.E. Parks 3.E. 3ingham R.3. Davis G.F. Malan 3.M. Dunn J.J. Cudlin ~ J.S. Tulenko R.H. Stoud: M.R. Gudorf J.D. Carlton 3.A. Karrasch J.A'. Castanes D.H. Roy E.F. Dcwling R.M. Hiat: J.M. Knoll P.A. Treventi REFERENC2: MEMO, SAME SU3 JECT, APRIL 6, 1979. ADDITIONAL INFCRMATION HAS 3EEN O3TAINED FROM T'!I WHICH FURTHH. SUBSTANTIATES THE CONCLUSICNS PRESENTED IN THE REFERENCED MEMO. 3ASED ON T'4IS INFOR.UTION, AND THE FLCW SPLITS PREDICTED 3Y THE PUMP CODE, AN 13 PSIA DROP ACROSS VESSEL DCNNCOMER AND CCRE (AT PRESENT CCNDITIONS AND CORE FLCW 0F 4500 lbm/sec) IS INDICATED. .du 27'a Cn U

• 4 ATTACCIENT 1 IS THE TA3ULATION OF RC' LCOP FLOW TRANSMITTER DIFFERENTI; PRESSURE SIGNALS C3TAINED AT 4:00 a.m., APRIL 9.

ATTACIDtENT I IS THE CONVERS!CN OF THE TRANSMITTER VOLTAGE MEASURE.'4ENTS TO LCOP FI.CWS. AS A FURTHER C'4ECI ~ 0N THE RESULTS, I HAVE ' ASKED MIKE KNCLL CF CCNTROL XfALYSIS TO ANALY!E THE SAME CASE USING THE SPLIT CODE. IT IS !!OPED THIS INFORMATION NILL 3E AVAILABLE 3Y L\\TER TOMORROW AFTERNCON. AT THIS POINT I WCULD LIKE TO ACKNONLEDGE THE EFFCRTS CF MIKE KNCLL AND PHIL TREVEN I IN PERFOR'4ING THIS ANALYSIS (WITHCUT Wil CH I WOULD STILL 3E SE TING UP UIE INPUT). IF ANY ADDITIONAL INFORMATION ON PL. INT STATUS (WHICH COULD ?E0\\' ICE A FURTHER CIIECK ON TilESE PREDICTICNS) IS K,NCNN TO 3E AVAILA3i.5, PLE.\\SE CONT.\\CT MI! I't.'.:ED I.iTELY. J N* j O7 PS3/C!! 79072 6ceM g.g7 p m %., q g p rd u u h'c:, wg /;io v 13 - n s e ap _._____.......s....

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~. THE CAGCOCK 5 WILC02 CO'FA::7 ~ ~ ~ ~ ~ P0xER GEftERATI0tt GROUP 1 To l 0 I 5 i R I B U T 1 0 :1 (~ From ses +n PS BARTELL5, TECHlICAL 'TAFF file 33, Cust. r Ref. h THI-2 Dat-Suoj. CORE PRE 55URE DRCP POR ?!ATUPAL C;RC'JLATIC: APRIL 5. 1979 10:10 7" CALCULATIC.S gn......................,................ _0_ _I. _5 T _R' I. _3 U_ T_ _I _O _'l EA 'dC:*ACX CH RCY CE PARKS BE B:::GH;:1 RS CAVI5 JD CAFLTC EM CU:::t JS TULE.'iKO MR GUCCRF 3A XARRASCM JA CASTA::5 CD MOP. Gall ~ GF MALA 1 JJ CUCL1:1 An analysis 'using the PUMP code) was perferred earlier this week to esticate i core ficw bicckage. Vessel (f.e. core and bypass) ficw resistance was yaried over a wide range and the change in Icep flew rates, core ficw rates and vessel delth P were calculated. ~he results are tabulated belcw: (*meansunbiccked core) Ry .tPy Wy Wgt3 WHL3 10170' 12310* -2543* 1.71 2' l.6* 3.5 2.98-9450 12550 -3244

7. 0 5.05 8596 12500

-2900 10.0 6.45 8095 12320 -4231 15.0 8.22 7443 12200 -4752 30.0 11.89 " 6291 11370 -5520 60.0 15.79 5125 11510 -6376 Where: 3 Rv = dcwntorce t core + bypass ficw resistance, (psia l/(ib:-/sec'2 X 10 ( aPV = pressure drop ac oss core + bypass, psia Vv = core + bypass flew rate,15m/sec 049111 HLA = hot leg flew rate, active locp, Ib=/sp,y.p';ii ^ J j, W 1 igt3 = hot icg flew rate, idle 1cep,15m/sec.y i; i.h g glg V e

,y.s e [n be se?n from the tabulated results, the active lecp ficw is not a Eng function of the vessel resistance. This is due to the hign reverse p (cws through the idle ;; ::s. Hcwever, the reverse f1cu through the idle locp is a strong functicn of the v'etsel resistance. Prior to this af terncen, / I had been under the impression that nc methcd existed fer calculaticn of reverse flew in the idle loop. Recent infor ::atien from *.he 11C grcup shas this r.ct the case. As early as last weekend they estimated the reverse j ficw to be -14.5% which translates to -6444 lb/sec. A further check today results in an estimate of -6797 lb/sec. Based en the tabula:ed da:a, :he vessel pressure drop is it least 16 psia. Additional evidenca to back up this is the indicated flew ir! the active icop wtiich is consisten:ly indicating 49-50% of ncainal '.gich translates to apprcx. 11,0C0 lbc/sec. Separate calculati:ns by Jim Veenstra and Lar y Lash '(se: i.ttachments) ca 4/4/73 placa casured ficw in the active. Icep at 25,350 GF:t (based on Centille delta P = 173"), which is a ficw rate of 11,445 lbm/sec. The attached figures indicata that the core and bypass pressure drop is be.seen 16.7 and 17.7 psia. A11cwing for conservati:m, I would recc m nd the use of l3;sinfer natural circulation calcuatiens. Additienally, I uculd estimate c .available core + bypass ficw at present conditions to be 4600 to 43C0 lb /sec. I have asked Jchn Castanas to cbtain up-to-data readings en Gentille delta P's as a further check en this analysis. He has been in contact with E'4Co and they feel that 'the transmitter accuracy is very gecd. ATTACHMFJIT PSB:jws l-- 6 a dL @ L 1 Rd..,' .n .D 549112 J NbdWun. aaI.b

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