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- 1. E. Wiloox, Assistant to anecutive 6scretary, Act8 i
SUAtKCT t BRL WITING ON JKaarr CEirnAL NuctAAR IlurimentAY10s REID AT W11EtaDA, EtnAMD 05 NAY 12, IS%
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mm purpose of this meeting was to fin $ out about tai discuss tbs wutloar instrumentation to to used at the proposed Jersey past:31 Oyster Creek assetor. The ACHS wa invited to attami, bd au i
rather abort sotice.
At the request of W. Regen sai Sc. Bevoce, l
A. L F. 4,ler tsa invited mai dia attend this meeting in W onpacity af ACMS conruitact.
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g Piv161e oues&rn L P. Nylar, omrdtant R. M. Wilcox,ch tf 1 Earnbli p X. R. Denton.
I Division yf heptistion K M. Mtan A raey Omntrsi l
11 vision of Assetor 1.ieenais D. E. astrick e R. S. hyd W C. Onske
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- 3. Sullivan Mr. Kane A L Grimes
- 1. Peabr.edy W. Schulthis A;4.;milar Qfy' i,
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lt egu a or7 Dktf me tint hair how of the meeting was dwated to na tateenal aiu aussico of tbs prehles;a by the statt and ACBS repressortatives,
- k. $ler 41seust.e4 wont at # pert in whiah a period arter sesalted in a faster trip than did level instrummatation.
Da. Eplar mise mapressed ecomern that failun of see alAp last might negate a scram.
W. Frisse11 did not think that the system would to) state single tailures. It was assamed that the Jersey Omstral instrumentation wuld b3 simtime to that at Dresden. there was l
general egressant that bypassing by a single tailun was - :;gle.
W. Prinsell tadicated that b sircuits were apt tested me utten as l
advertised. Dr. W urged mon tropent testing, it stagle tailum megating circuits ven accepted.
Mr. Boyd and Ec. Mann agxted that tM purpose of the meeting was to ash Nhat" and "why" on the instrumentation, but mot to M a full an3 final.tudgement.
_ Jersey Central _& GenenL1 metric Wr. Osake asked for a presentation on the matety ar/ stem.
W. Artrick iniicated that this had teen preparsdj be then turned the meeting over to Mr. Peabody.
Mr. peabody st4%d that a swo-bus, nlay-type system would be whad.
the basic criteria vould call for a scram for any potentially usante conditioa; no scrum for a spurious trip or instrtssent malfunction.
i f-Circuit sizqplicity would be stressed; pewysm o p13 ment used. Amitoious duplication would be employoi ine'uding tail-safs design features, i
1.6., tailures to not prevent a shut-doen or trip. Circuits an to l
be understandable and easy to maintain and test.
"On line" service is to be prwided to satisfy the utiliky and be comparshle to fossil fueled plants. to sissle fault is to eauen m peren.
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4:*1ves was descrited. For Jersey, each drive vill have its sum k Y'"
serna and pilot valves. A C ourrent vill agply %e solemaids oc the pilot valves) 5 C will egyly a baakup valve. It both pilots fail to tunetton, Wt %s backup valve waste, the red will actus but sit a reduoed rate of speed (seecasts). the haakg valves are not fail-aste.
To date, W has asperianood only one pilot valve tailure to drwp out, that due to improper valve stou ambertal.
Thett was same discussion of what would happen it rods von ping in, but the reactor was on autcentic recirculation flow costrui.
l m's present approach is to oontal pressure with the tattial pressure ugulator.
i The scram pilot valve was described. the most likely failure mode is for the valve to eloos which is safe.
Bert, the Dessden relay approach was described. Two parallei M O volt screa buses an used. hach safety shain is represented la each channel. Insofar as possible, mensors fail open. Autasatic trips won not pmvided for salibration - this is an administrative function. There is no undarycitage trip.
Thars was discus; ion of why there is no sena ou loss of turtire l
load. Tests show that the reactor is safe on the overpnssurw and the applicant hopen that breakers will close bac's in after a few eyeles. trendan has d.mped full load once without a seres. the flux trip was stated to oome test in such an event anyhow.
The Jersey Central coe-bus approach was part described. Imrewrr-
' vetted contact-type rgies will be used; these have very high military i
reliability figures. There azs tour s m qps of pilot valvet. Tripping i
of cittrar belt of the bus trips all solenoids, which vill be of the D C type. Parting of the contacts will teks 4-5 mooc (1) at most).
pi-tars will contain no relays, but rather vill use a solid state trip device as'her t' ann a vacum tube bistaMm. the say11 tiers are miso solid-state. W is sonsitaring a line whiah was also used at-the liniversity of Missouri reactor.
Camponents would also be statlar i
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I to those bein6 instau ed at 84 1, although the *fsty circuit is *,g','
f qu1ta diffenut, he annunciation scheme for Jersey is not yet funy vozted out.
OR recognises that the advantage of du; plication is lost if a tireult aan fsil.
p meeting recessed for lurr.h trun 12:10 until 1:00.
I Decirculation flow control is under study by % APED, and Mr. Peabody is a member of the Cbumittee doing this studying. D ere vin be a j
motor-genarstor iset loosted outside of the oontairement and provided with a variable coqpling. Etw generator output cables viu penstrate the contair=*nt and provide power to the motor-drive.n recirculati n puces inside the dryven.
The primary control signal for the variable coupling has not been selected. Possib22 feedback signals an recirculation flow, stesa flov, a limiting flux, or otbef.
To raise plant load, ncirculation puqps vin be speeded qp; turbine admission valves vill open subsequently on prwssure increase. Prweent I
utding is t. bat a sunnual signal win be used for recirculation con-trol. Iosd-follovima control is under study, b:nrever. Mr. Betrick I
I eventuany would hupe that load would be detemined by the systas load dispatcher. he present thiding modifies what is stated in the hasards nport, and thus nueviates concern expressed by Mr. Knuth l.,
for an incident irwolving rods trivin8 in with neirculation flor con.
trol on automatic.
Dr. Kyler questioned whether the operator von't increase ncirculation flow to hold steady power.
OE has not looked specificially into the i
flux Wing probless this might present, but because of intermiving of rod batts thtric that this Right 3x)t be too great a probleu. Dr.
Epler stated that there is a precedent for requiring a sensor a,ni limiter on rod misposition 11 this is harmful.
There vi u be manual isolation valves located near the pilot valves.
Where was further discussion of the effect of mispositioning of gods, such as could nault frun a loose position trailcator. GE believen N.
that its position indicator design sekes this inendible, inrt further aanlysis of this problem as an accident situation wi n be done. -
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r ter. Ouke guestiorwd whether flux trips vould to set down at tevN :y hn fun recirculation f1w rates, this is not planned that the operator could evitch to bl 30% scale at say W, amoryt flow.
Pios contral is nat planrad below 3010f; steam separator action and other things must to stuited at low flor actes, the retirmlation flow dial may havs a _rute jimit to ooctrol rate of roe.etivity inear-tion try this asca.ns.
Dr. Epler described his conoept of what nuclear instrumentation is being proposed for Jersey Central. Bo would awoomroeni that the two halves te physicany esperated such that no one feilure could tie it up. GE iniicated that the halves are physicany divided.
e Hr. Knuth guestioted the estacity of the acaergency diesel as related to the loads it asust omrry.
IAe was concerned about control cirwuit l
l failure which might tie all circuits into tM bus tbach would then cause overload trip..out. This is not an integrated systems, lesver.
l There is no readout to shw that a scram solenoid valve has operated correctly. Failure of an entire gitup of polenoids aan be tolarated, hwever.
Mr. Betrick stated that there vin be alaras on ths *E' t
tolay1s.
i The nusber of rwis per backup valve is not yet firm, there viu be l
one station D C pner supply (tattery).
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Frequancy of testing was discussed, but it was generany agreed that tt.is could be deferred until the operating stage.
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Process instrment scrnas viu each be movered by four mennore ani operateon2/4 coincidence. the oonienser vaevum svitch is ons i
exception; it win have only two sensors.
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A better story on Ing N ani period protection was reguested. Righ sensitivity picosmoters Ray be used) these would provide tVO deondes of covera 6e below Lo6 X.
GE telt that the utsponse to a fast period vould be essentiany equivalent; for a 5 *econi periot each would trip i
in 3 acconis. At higher powers, the plocameters were stated to be Testar.
Downseale trips on au but the lowest range are to be yW M aed. Manual range switching vi n be used. There is an alaca on ces piecurmeter ownscale, three picommeters dwnscale trips the chanteel; three on the other chatumi tripe that one. Mr. Osake imil '
cated that Jersey Central vould be asked to,)ustify eliminatston ef., g-the period seran.
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6 a v 4r e $ E, immaw instnaments vill be um D.C (battsry) power sipply. Gene ~g.*N L
i prosess instnments, Ameluting water level, v11.1 he en k8 q "4, and viu be en the bus powered by tem 41eeni. abr. Gallavem and Dr. 41er suggested that the diesel be started if the Amreer Oss4ral generstor is lost. Afteheat reenal met be matamalmad ter housst watepp water is added through the red drive pimpe.
bpassing at tius shammals was discussed. A shmael ta apparsatly i
not tripped if only one is bypassed. 3r. bier suggested as arrmaps.
sutus which v.m14 permit one and only one chaamal en each side to be l
bypassed.
heaulatory Staff I
Dr. Epler expressed comoern over the semplosity of the bypasses, which art integni to the safety contawts.
W. Frianelle eW that a brand nov line of solid state instnseents would he meet.
i In a brief meeting with Dr. apler ami 1, k. hann prsposed and it was generally agreed that the ariteria looked E, and there is res.
sonable assurance that the instrumentation viu ease out M.
Dr.
41er semanted that it looked like a pretty good system and it could be done this way, but that it must be watched closely by the Begulatory Staff.
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