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Site Problem Rept 456 Re Confusing 855 Pressurizer Level Indication on 730901.Recommends Output for Pressurizer Inputs Be Temp & Pressure Compensated Pressurizer Level. Supporting Matl Including Ha Baker 740114 Memo Encl
	ML19322A356
Person / Time
Site:	Arkansas Nuclear, Crane
Issue date:	02/19/1974
From:	Baker H, Faist F, Stables T; BABCOCK & WILCOX CO.
To:	;
References
	TASK-TF, TASK-TMR 456, PROB-740219, NUDOCS 7910040414
	Download: ML19322A356 (15)
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.NSS-S/SA25 Subj.

Date SPR 45t>

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Jan ury 14, 1974 i

he agree that the representation of pressuri:9r level tranmitter ircuts to ccrputer in ten-s of incorpensated delta P is conituir.c. However, the operator has availabic an average corpmsated pressuri:er level readout as Point 1503 as the cc:puter.

additien he has available a readout of t.v carpensated pressuri..er level signal selected In i

for centrol on TCl-IR.

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1he attachwi correstralence indicates that this is a sittutica of Icng standing and d

t cre incitdci fer yeur infomaticn. Since the cost of the su;:gested chan;es to make i

tl'e operators life a little easier is very high, we wculd like to leave the status r.s is cad intend to rake no changes.

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Reference:

S (1)

R. L. Healer to M. H. 7aharna da',ied 6/8/73 discussing the 5

BC Proscurizer Level Temperature Cczpensation Calculation.

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Sp ec Sheet represen'.ing S.O.1601L125

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CS-3-90 Co:puter Spec for nSS-8 dated Jar.uary 4,1971 g

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3 In the revised submittal of PR h303T-Elo, sailey Meter CMo is re-4; quested to touch base with BS:U to get proceedings in motion to change

'j the subject computer points to temperature compensated pressurizer Q

Level.

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are requesting that all three computer differential pressure inputs n

should have calculated results rather than being averaged into one gl calculated result, w

In the CS-3-90 dated Janu try 4,1971, Esiley is requested to supply 3 (L

computer in Page OA.6). puts representing uncompensc.ted Icyc1 readings (Sec.7 9,

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t'ncompensated ir. pats as differential pressure inputs as opposed to L

uncorpencated 1cvels (Refercnce (1) above, Tage 2, Item 1).

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Also, in the CS-3-90 dated January 4, 1971, Bailey is requested to supply only one RC Pressurizer Level Computed Result (fac. 7 9,

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Page dA.k a,117ie 906). This Computed Result is currently an average N

of the three differential pressure inputs after temperature compensa-h tion.

Thus, Bailey is according. to spec and any change to existing M

program Icgic could onl: co.e as a result of BEcW direction.

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Hencter Coolt.nt Prescurizer Lcvel Tc cpernture Ct :c.puanation 6/8//3 I

i I

1 6

1 P,

EhCKGROU::D E

1 Although thir ec:.e ::prcifically referes.ccr the Teledo Edicca Cc.

J Job, B*Co Jcb 1220::, the p;sble:a and colution:: precented here actur.11;-

It are applict.ble to all currer.t and previcu I:ccicar Stea:n Suppl. 855/5G s

C or 85S/29 cce.puter applications.

Specifically these jobs are cc b

l fo11cxv:

[

l 1

1.

Metropeliten Edincu Company, ECo. Jcb : o.150L P

P 1

l 2.

f.rkansas Pcuer & Light Cc:..pany, E:<Co. Jcb !!o.160lL

[

l L

3 Florida Power Corparaticn, E:Co. Job ::c. 430L g

I 4.

Sacrar.cnto Municipt.1 Utility Dictrict, E.Co. Jcb 1;o.1602L E

l 5

Jersey Central Pcuer & Licht Cmpany, E-:Co. Job I;c.1595L F

6.

Toledo Edi :en Cc: apt.ny, BM^o. Jcb I!o.1220I1 6

l c

There une considerr.ble uncertaint.:. en the e7. net requirc:nents for the 2

L reacter ccc3 ant precsurizer Icyc1 te..:perature eczpencation calcuir. tic::

with regard to necccnary accuracy ar.d relaticrrnip of the varicus anuociated prcccan varir.b3cc.

f:, a result, varicus r cr.cs were inter-chanced Let'.icen Bailey Meter Cor:: pas.y and the Entecck ic Uilcor. Cc-.pany on thic tub. lect.

Picace refercree the attached ccpien of the follcwir.-

1 raccon for the ba::hnrcund on thir infc.r::ation interchance as follcus:

q 1.

R. L. llcalcr to J. C. McCreary on February 9,1973 3_

2.

H. L. !!caler/M. N. Zaharna t,o J. R. Ech:sidt on March r), 1973 r.

~

3.

J. E. Jonen to J. C. McCreary en March 23,19'/a.

Tb:

e 4

H. K. Jahn to J. E. Joneu on tipril 18,39'/3 O

d j

5 J. C. McCreary to J. E. Jonen on February 15, 1973 3

l 6.

E. S. I:aurul to J. C. McCreary on Januar/- 2, 1973.

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}s TO M. ft. 7.aharna Flt0M R. L. I!caler 6/8//3 l'a g e 2

$M Decpite this proliferation of correspondence nnny tu.certair.tlea Otill exlat.ed atout tht: calculatirn.

In an at.t.cnpt to Leeure n T'd:1 i

rcuolutaion of all cutatanding (;uest.inne cn the rubject, a *>.05100 unc cot. up between 1311cy Pet er Ce par.y and Pntecch 21:11cv. Ci :..r-ny 4

on !*ay 17, Irf/3 with R. L. Healer reprenefit.1::n L*:Co. and P. J. FenCLi;;

representing P3.!.

R. K. Jahn alco at.t.cnced et=c pcrtic:. c r ti.e A

meeting briefly.

13

{4

!!EETI!D ONECTIVE"

,'j' 1.

Recolve t!.e proper reprecentatic.n cf the unce - e. sid e-!

input valucc and she " bad" slarming c.:cccinted m.r.

tnca.

I, 2.

Resolve the proper relationship of the reacter eccl 000 i

pressuriner level uater reference les torperature veristicn; L<

witu rer;'cet to tne reactor ccclant, prce uriter Icep2rr.ture Q

variat. ion: tucreclvec.

p 3

Ectablish tne necessary necuracy ror tnic ccr.puta: Ion th cugn-3 out its radge.

H g 1 '

i HES UT,T.3 4

1 I/ i 1.

. It van acreed that a recconable reprccentation Tcr the uncorponcated input uns in terms of cifferential pre::;re i

j j only.

It uan noted by E311ey F.cter Ccupony that reprecentinc inputs as uncompensated level vercus reprecenting tne1 in terms of different1*.1 prc cure made thc= nc ncre er Icts j

likely to be reported as " bad" alarms.

This discuncicn us

,i in referenec to a cucaticn that was railed in the T.aren 23, O

1973 memo cent by J. E. Jcncs of B~l.! to J. C. V:Crecry cf A

Bailey F.eter.

It was, therefcre, agreed ECCo. Uculd repretent all uncc=pencated inputs on the varicus Jcts as ci:Tercntit.1 4

prcccure inputs an oppcccd to unco pen 32ted levels.

It uts

'i alco agreed that 32-chcr00tcr descriptorc acccciated with 1

these inputs chculd 1.tve the abbreviation "DP' added tc the=.

The recult of this atrcement was that the un:c=;en:ated A

inputs uould range from either M0-0 or 320-0 inches ncmint11..

4 s

i 2.

It was agreed that a cixth-order curfn=e fit fcr thi I

calculation wau mero deairabic than a ::eventh-crder curface rit for various reccenu, amontst. them the fact: tr. 2

tha

/

BMCo. In-houac facility can not co beyond cixth-crder nnd f

ripplea are more likely to occur in a neventh-crder curface 1[

fit than they are in a sixth-order surface fit.

Keeping the desirability of a cixth-order curface fit in nind it h

was agrecd that 12~.Co. uculd nttempt to Iraplement a sixth-order surface fit uith the following necuracy requirencnts:

I Pluu or minua 1/f% of rance in the normal cperating I:

reactor coolant, prebuuriner temperature rance of j

600 to C(0 *F, and maximum allouable errcr of plus

(

or minun 3pis for the balance or the reactor ecolant, prennuriner temperature rance.

l It, was nf,racd that IECo. would attempt, the inpler.cutat!cn-s._ _N

^[. h M M j{ h N N M N E. h M N b N-N' 9 ? - 2 N D U N k $ b 7 AChM 4 E--d f M M A E E C M T

(*

[

...-.__.u..~

-y..

_j m

~

@h vJ (T/0/l3

/

s

)

'[V :1. II. Zaharna F111 11. L. 3fealer Pai'.e 3 i

$g'b,.

EN WJ[j advine Jr.J of the result,n.

QMCA 3.

Tnere uan cenaiderable dicenaulon abt.ut the czact ielaticn-W Ni chip of the unte.' r'eforence 1er; tempt r:. Lure to tne t erperntu: c NM@i Ms in th, pa w s. t ra r I L. 'A T, a nd !;.

1".. J:.bn of Il Co. and J.

I'.

Carlton : P Ei.'! particip ited in come of the discuc.-Icn.

The Ofd19 g@

conclusiene that ucre reached ucre that t.he varintiena, in the uater reference leg ter.perature hed ser, li tt.le effect NK upon the final computcd value of the terpc rature cc.cpeacnted Wi,l.

%i reactor ecolor.t prennuriner IcVel, and, if a ccust:_nt. tcr:p-g crature vere Otsu red fer the unt er reference leg it could g

af fect the cutput by cnly about. 1/2 cf 17 Cince, hct cver, Q

)

ECo. han already irrplerented ucta wor % uith a varing trater figg

%ygp reference leg temperrt.ure it uns agreed t. hat no siccificant h

ucr% could be caved by chan;',ing to a cenatant utiter refc20cce leg ter.peratur e.

In c.dditicn to the preceding, if a constin; N3ta !

Q(@

unter reference leg to perature were assumed, it uculd have 5f to have a different value from job to Jcb. and hence t:culd TIM 9) also rot nllcu any naving of work to E:Co.

lim! al0o notec that the intreduction of a 1/2 cf 17, crror into the calculctice.: Nf dh@y@

una cle:;e te th-

.anicum allcut.blc tolcrance thnt they felt necenscry fcr this ccuputation.

B1'.1 did agrec, bcuever, thn this relaticeship wa basically an imperical one and it uns Ms very un11%cly that the variation relcticnenip uculd be differe..: $N frc, job te jch. Ilevicuing the specified variaticn us Wp@h1 indiented cn varicun prcvicu: and cu:'rcnt jobs it une acreed

$5 betueen EE and ID'.00. that the vcriatjens cpecified fcr TECc undoubtly presented the srcacthest and = cut prch ble vcriatic.,

E*M and thercfcre 11.7.! agreed to rocc::mond t.c their cr.ginecring D$$

depa: t.:r.cnt that thic particulcr relatienchip be uted cn cll EM future job:.

It una further agreed that na Icnc as the em relaticnshi:, specified for the varicun joba uan the ca:r.e as WM Toledc's cr S:'UD's, or that uced cn the Metropolitan Edicen M@

Co. Job, th;t no attecpts would be mnde to chance cr deviste kfM*E fro a that crc:1ried.

If houcver, any different relatiership ff$g was cpecifir.d it was agreed that E?.0c. uould advise ET.! cf M

that fact. ar.d a nutually agrecable relatienchip uculd be cet

>I,%

up to minir:1:e additional ucrk frcm Jcb te job.

h@h

@GJ.S (The last tt.o ite-.

11cted under results are alco lirted in a h.nd 3

written, signed, and dated agrecr.cnt ubich is attached to thic ceco.)

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IIL!!::r.nj llichard L. IIceler d5h Attachcent0 D'*#

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i II. K. Jahn l'3 ll J. J. Ibdmann A3 11

11. U. Ibecch /2-13 E. J. std. h%

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J. G. f,t einerunner I.L'-13 W.

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FPR 303TE10 (attached)

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Sof tware Problen Letters dt.ied 7/30/73 and 10/23/73

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.~J.J. Bodaann to ll.A. Baker

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11/12 4:atus and we are pleased by your resp /73 on Plant Coc:puter j

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FPR 303TE10 and the above referenced letters fall into M?, sine categcry o' outstanding softe re problems which

<24/73 letter addresses.

'40 your t e f r.; these matters offer our full assistance to to quick resolution.

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