ML19254B176
| ML19254B176 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/10/1979 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| 1-099-4, 1-99-4, NUDOCS 7909240520 | |
| Download: ML19254B176 (24) | |
Text
V.* fBetM ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK. ARKANSAS 72203 (50 0 371 4000 September 10, 1979 l-099-4 Di rect or o f Nucle ar Reac tor Regula t ion ATIN:
Mr.
R. W.
Reid, Chief Operating Reactor Branch #4 U.
S. Nuclear Regulatory Commission Washington, D.
C.
20555
Subject:
Arkansas Nuclear One-Unit 1 Docket No. 50-313 License No. DPR-51 Degraded Grid Voltage (Fil e :
1510)
Gentlemen:
As a result of recent telecons (August 29, September 4, and September 6), the following is provided to document our responses to those t ele cons.
This letter incorporates the applicable portions of our August 24, 1979, letter and there-fore, supersedes the August 24, letter.
PART 1 - RESPONSE TO JUNE 20, 1979, LETTER Iten 7.
For each Section of IEEE 279, describe how the proposed under-voltage protection modification complies with the criteria.
_ Response:
The following briefly describes how our Milistone Moc'ifica-tions as proposed to you in our August 23, 1978, letter con-form to the requirements of each Section of IEEE 279.
a.
General Functional Requirements - The devices and equip-ment us ed are qual i fi ed f or Cla ss IE application and the performance of the devices is highly reliable.
The system is designed so that the protective action is automatically initiated as the system reaches preset levels.
b.
Single Failure Cri t erion - The two load groups are provided with redundant protective actuation control systems.
- Also, wi r ing for each of the two control systems is routed in separate Class lE raceways.
W 7 909240 MEVBE A MCOLE SOUTH UTILITIES SYSTEM
,/
l-099-4 Mr. R.
W. Reid September 10, 1979 c.
Quality of Components and Modules
- The devices used for the two protection systems are quali fied for Class IE application.
d.
Equi pment Qual i f i c a t i ons - The available type test data Ior Class lE components qualifications confirms the re-quired satisfactory performance of the protection equip-ment under the environmental conditions stated in Section 3.7 & 3.9 of the I EEE-2 79 - 19 71.
e.
Channel Integrity
- The protective systems proposed have been designed Tor fail safe operation.
The devices and circuitry used are Class IE and therefore shall remain ope ra t i onal under ex t r eme envi r onne n t al, energy supply and accident conditions.
f.
Channel Independence - The equipment, devices, and race-ways for one CTass TE system are independent and physically s eparat ed f rom the other sye+em.
The circuits for the two Class lE protective sys. ras are also routed in sepa-rate raceways.
g.
Control and Protection System In t erac t ions - All the equip-consideFed part oT tee protection sys t em whi ch i s ment is de signed to me e t the r equ i r eme n t s o f IEEE 2 79 wi th the exception of the RCP starting bypass initiation signal (i.e.
the contact fran which the bypass s ig nal is initiated).
The s i gn al, however, is isolated from the Class IE por-tions of the sys t en by a Cl a ss IE buffer relay.
For further details, refer to our response t o Que s t i on 6.
h.
Isolation Devices - Isolation devices are not used as the kystems compTetely Clar= lE.
are i.
S jin le Randan Fail ure and Multiple Fail ures Resul t ing f ran single Tailuri CreHT51 e BingTe Even t -
There are no a
points as the system are comple t el y Cl a ss IE, separate, and redundant.
j.
De riva t ion o f Sys t em Inputs - The undervoltage relays pro-posed at the 480V ESF buses will measure the sys t em de-graded conditions directly and initiate the protective action at the sys t em level within its respective load group.
k.
Capabil i ty for Sensor Checks - The 92% undervoltage relays Eave Seen provided with func t i on al test switches.
Periodic t es t ing wi l l ensure the sensors' operational capability.
993037
' -099-t hh, R W. Re'< Sep t embe r 10, 1979 1.
_pability for Test and Calibration - The sys t em has the capaEility fee testing.
Calibration of devices is dis-cussed under i t en 9. c.
m.
Chann.1 Bypass or Removal f: rn Operation - As explained in t hi r epl y t o Que s t i on 3, of our letter of July 12, 1979, s;rs tems have the capabili ty to be tested in-service without initiating a protective action at the sys t em level and also continue to meet the sii.3 e f ailure criterion, 1
n.
Operating Bypass - The protective action to the two sys-t em s can be bypassed manually during starting of the RCP motors.
The operating bypasses are Class IE.
o.
Indi cat ion of Bypasses
- The bypasses will be al a rme d in the Control Room, p.
Access to Means for Bypassing - Manual bypass of pro-tective action is provided through test switches.
The access to the test switches will be under the adminis-trative control of the Shift Supervisor.
q.
Multiple Set Points - The protective devices are set at one set point only.
r.
Canple t ion of Pro t ec t ive Action Once It Is Initiated -
Dnce tee protective action has been initiated the oTf-site source is aut ana t ical ly di sconnec t ed and the on-site source (Diesel) is made available within a short time.
The protective action will go to c mple t ion once initiated.
s.
Manual Initiation - Manu al control is provided on each of the two breakers for connecting or disconnecting the o f f-site and on-site s,urces to the auxiliary power systems.
Manual initiation requires operation of a minimum number of switches.
t.
Access to Set Point Adjustme.t Cal i br a t i on and Test Points -
Access to 3et Point Adjustment, Calibration and Test Points is control led Adminis trat ivel y under the Shift Supervisor and is limited o qualified personnel.
u.
Identification of Protective Action - The breakers for the Eff-si.te and on-site sources have close and indications in the control room to identify the protective actions.
v.
Information Read Out - Sufficient monitoring has been pro-vided in the control roan whi ch wi l l enable the operator to know the deteriorating conditions of the systems.
993038
9 1-099-4 Mr. R.
W. Reid September 10, 1979 w.
System Repair - Periodic testing of the sys t em will en-sure tee detection of the mal func t ion of components or modules.
Plug in type of components are used where possible so that the faulty units can be replaced, re-paired or adjusted expeditiously.
Also, the sys t em pro-tective action is designed such that the failure of one undervoltage relay will not disable protective action.
x.
Identification - The equipment and wi ring of the two pro-tective systems have been identified as red and green ch annel s.
Item 9,c.
The ANO+1 anal ys i s assumed that protective action would be executed at (or above) the calculated value of 92% (Motor-base) voltage.
Indicate:
(c) al lowanc e (above 92%) used to accommodate drifts.
Describe the basis for determining these al l owa n c e s.
Describe the bases for determining the nominal setpoint which provides maximum protection consis-tent wi th minimum spurious shedding fran the perferred power source (i.e.,
electric grid).
Response
The 4 60 undervol t age relays are solid state relays set to trip at a specific voltage.
The physical inaccuracies of the rel ay are wi thin the error band of calibrated test equip-ment and are therefore indiscernible.
Upon installation of the rel ay, it will be calibrated using instruments that are calibrated traceable to the National Bureau of Standards and accurate on the order of 1 0.02%.
To date, no information exists on possible drift of the relay either inhouse or f r an the vendor.
We wi l l calibrate the relays upon initial installation and quarterly thereafter until the next station r e fu el i ng.
The data gathered will be used to ad-just the set point as appropriate to accommodate drift.
Relays normal ly exhibi t li t tle drift and in the case of these solid state relays, we expect to see drifts much lers than 2%
if indeed any exi s t s a t al l.
The purpose of these relays is to assure that safety equipment is not subjected to degraded voltage and in particular the mo tor starters and fuses.
In our analyses we verified acceptable voltages to the starters and control fuses assuming they are located at the motor terminals.
In reality, the starters and control fuses are located at t he mo t o r control center, where voltage is higher 993039
1-099-4 Mr.
R.
W.
Ried September 10, 1979 than at tne motor terminals (to assure 90% voltage at the motor t e nm i n al s, our acceptance criteria is higher than 90%
voltage at the motor control center to allow for voltage drops in cabling, etc.).
Therefore, a setpoint of 92% pro-vides approximately 2% margin (conservatism) for the most c ri t i c al couponents.
As we anticipate relay drift to be much less than 2%, if any, we believe operation for one fuel cycle while drift data is being gathered is appropriate and within the conservatism of the analyses.
PART 2 - NRC AUGUST 16, 1979, LETTER Item 2.
Provide the 480 volt and 4160 electrical sc h ema t i c s showing the proposed degraded voltage protection system (both levels of protection).
Response
Attached are 4 copies each of drawings E-35 and E-36.
Item 3.
The proposed undervoltage relays wil l have test plug cap-ability.
Describe the test plugs, their function, and their effect on the relay.
How is the test pe r f o rmed and spec i-fically what is the function which is tested?
Provide a s c h ema t i c wh i ch illustrates the func t ion o f the test plug on the relay.
Response:_
Attached is ins truc t ion manual G.E.
H-1768A showing the connect-ing plugs.
A description of the test plug is shown by the attached publication gel-25372.
When the connecting plug is removed and a test plug is inserted in its place, all relay points are accessed, bo th the relay side and the source side, since each side is brough to a separate terminal on the test plug.
Since this r el a y is an undervoltage relay wi th cont ac t closure specific set point, the relay contact output set to close at a c l o su r e can be verified at the set point without execution of the desired final action.
l i en 4.
a)
We interpret your response to say that c al i br a t i on followed by a functional test will be conducted prior to initial operation of this system and during each 393040
1-099-4 Mr. R.
W. Reid September 10, 1979 refueling outage thereafter.
While we belie - this test interval is appropriate for calibration,arposes, operability should be verified by performing a functional test more often, e. g., mo n t hl y o r qu a r t e r l y.
Propose a suitable test interval for functional testing, b)
We speci fically re gested a description of the test pro-gr am which would verify (once prior to initial operation of the protection system) that no unacceptable voltage would be applied to ESF equipment when the grid is at t he de f ined "mi nimum-normal " level.
Describe the test progrmn.
c)
We are concerned about the adequacy of the voltage applied to ESF equipment during the starting of large non-Class 1E motors, such as reactor coolant pump motors.
This is a major concern.
Your analysis indicates that the lowest acceptable voltage is 92% for an eight-second duration.
During the starting of large motors, you have stated that the voltage f alls below 92% and stays for longer than eight seconds.
Provide the valves of these lower voltages and duration for the starting of each large non-lE mo t or (under appropriate plant and grid conditions).
Explain why voltage levels below your minimum vol t age acceptance criterion should be considered acceptable.
Please note that the voltages when starting large motors must be determined to be acceptable (on an appropriate basis) before one considers the acceptability of a design feature that would bypass the degraded voltage protection during such startings.
Response
a)
At least once per month, the r el ays wil l be verified functional (Channel Functional Test).
' east once per 18 months or each refueling outage, the annel will be calibrated and fun c t i ona l l y tested (Channel Calibration).
b)
After ins t al la t ion, the sys t en wi l l be deuons t ra t ed oper-able by a functional test as described in our letter of July 12, 1979, response to I t en 4a.
c)
Your interpretation of the 92% bus voltage criteria is not correct in that it i s no t mi nimum al lowabl e in al l cases.
Appendix I page 5 of our letter of August 23, 1978, identi-fies 90% canponent voltage (92% bus voltage) as limiting for continuous operation but notes that " Safety-related mo tors we re Besigned to provide fu l l load torque during momentary dip to 75% of rated voltage when other motors accelerate on the system.
On the s ame page it states 993041
1-099-4 Mr. R.
W. Reid September 10, 1979 that "During large motor starting, voltages at the 416 0V ESF bus s es we re ma rgi nal ", not unacceptable.
The voltage dips on the safety related busses do not exceed 75% of rated voltage during starting of Reactor Coolant Pumps.
Therefore, the voltage dips due to RCPs starting are within acceptance criteria.
The magnitude of the voltage dip due to RCPs starting is within the acceptance criteria for the safety equip-ment.
However, the length of the voltage dip may exceed 8 seconds, therefore, as RCFs must be started during normal plant startup and may be restarted at some de-layed time following an accident, the automatic bypass is necessary to avoid spurious trips of off-site power.
The bypass signal wi l l originate f r an a non-Class lE contact on each RCP.
The non-Class lE signal will be i sol a t ed f rom the rest of the Cl a s s lE bypass cir-cuitry by use of a Class IE timer.
The timer will allow bypass of the undervoltage protection for 20 seconds while the RCP i s started.
If the timer does not rein-state the undervoltage pro t ec t ion wi thin approxima t el y 25 seconds an ala rm wil l annunciate in the Cont ol Room.
Item 5.
Submi t t al V-2A and V-3A shows mo tor base vol t age on 4160V bus higher than designed maximum 110% and that on 480V bus as mar-ginal.
Further, if transformer secondary voltage gain (due to higher applied voltage (22kv) on lower rated (21.5kv) primary windings) i s added to the bus voltages, the result will be un-acceptably higher voltagas on both 4160 and 480V equipment.
The submi t t al fu r t he r indicates that yo u r assumed no load condition includes 25% of the t rans former caoaci t y as running load on 480V bus and 1.885 MVA on 4160V bus.
Yo u a r e requested to justify 1.0 PU tap under the above mentioned concerns.
- Also, provide the anal ys i s that gives acceptable voltages on Class IE equipment for maximum grid voltage and a realistic no load condition (such as 5% or less of the transformer capacity as 480V running load).
Response
As noted, cases V-2A and V-3A do show bus voltages slightly above 1.1 P.U.
However, the bus voltages do not take into con-sideration.the voltage drops from the bus to the actual com-ponents.
When these voltage drops are taken into considera-tion, the over excitation i s mi nimal.
In addition, the above 2 cases were provided in response to a speci fic ques t ion and are no t representative of voltages safety equipment would ever experience.
These cases assume essentially no load on the busses.
During the modes of which S93042
1-099-4 Mr.
R.
W.
Reid September 10, 1979 safety systems are required (e.g. Modes 1,
2, 3,
and 4), there must be significant other plant loads on tne busses for t e plant to be in that Mode.
Only in the case of a loss of off-site power (in Modes 1,
2, 3 and 4) would there be no nc:.-safety loads running and in this case, safety loads would be powered f r an the Diesel Ge r.e r a t o r s.
Therefore, we conclude that the sa f e ty sys t ems wi l l not exper-ience any over excitations.
Regardi ng your reference to transformer secondary gain due to applied voltage of 22kv on transformer winding of 21.5 kv.
This gain was taken into account in the computation and appears as a tap 0.9773 on the top right corner of the case.
The com-puter code, therefore considers the gain due to applied voltage being higher than rated voltage of transformer winding by using a tap of 0.9773.
I_ tem 6.
Our review of the bypass circuit for the starting of large motors has determined that this single bypass is a single failure point for operation of ESF equipment.
This is a major concern.
Each large motor has a single time delay device.
(This timer does have two output contracts which operate in a separate schemes to bypass the degraded voltage protection in both divisions o f el e c t ri c powe r).
However, the postulated failure of the timer mechanism itself for any such motor can result in the loss of voltage protection in both electrical divisions.
This single failure potential must be delineated, possibly by using two timer mechanisms per motor.
See our comment earlier regarding Item 4c.
Response
As di sc us s ed in our response to Iten 4c above we propose to in-stall a delayed alarm in the Control Room to annunciate in the event that the undervoltage protection blocking circuit does not reset.
The alarm detection circuit will be activated s imul t aneously wi th the blocking circuit and will use a Class IE timer.
I t en 8.
Your response dated July 12, 1979, indicated that load shedding of essential loads was proposed only when the station auxiliaries are suppli ed power from startup t rans f orme r No. 2 (ST 2).
No load shedding would be applied to startup transformer No. 1 (ST 1) under the sane conditions.
393043
1-099-4 Mr. R.
W. Ried Sep t embe r 10, 1979
Response
See our response to I t en 9c in Part 1 of this letter.
PART 3 - TELECON ON AUGUST 21, 1979 I t en 1 Provide a listing of equipment that c anpr i s e the 4160V and 480V running load as shown on Table 2 to AP&L's letter of May 21, 1979.
Response
Table 1,
attached, is a listing of all running loads assumed in the above analysis.
Very truly yours,
\\,f ;/f,; I
David C.
Trimble Manager, Licensing DCT/JTElew S93044
1-099-4 Mr. R.
W. Reid S ep t embe r 10, 1979 Your August 23, 1978, analysis and all our subsequent communi-cations have indicated that when operating on ST-1 during
" abnormal" conditions, shedding o f non-essent i al loads was e s sen t i al to maintain acceptable voltage.
Explain this change.
Show why load shedding is not needed for ST-1.
Response
During conversations wi th the staff in Aby, 1979, it was agreed that the initial grid conditions assumed in our sub-mi t t al of August 23, 1978, were overly restrictive and con-servative.
We proposed new conditions that were more realistic which would result in anal yses mo re cons i s t en t with NRC require-ments.
These new assumptions were agreed to by the Staff and were transmitted to you by our letter of May 21, 1979, along with new an al yse s.
Due to the over cc servatism in the August 23, 1978, submi t t al,
it was necessary tc shed loads on ST-1 to assure adequate voltage.
However, under t he mo r e reali s t i c (yet still very con-servative) assumptions of our May 21, 1979, letter, analyses in-dicate that load shedding upon fast transfer to ST 1 is no longer necessary.
Load shedding upon fast transfer to ST 2 is s til l necessary.
Item 9.
As you have indicated, your response is not c a.np l e t e.
You have committed to providing information on the set points of the undervoltage relays.
Provide the i n f o nna t i on o r a schedule for providing the information.
Our concern here is a proper stack up of the tolerances in the system including the inaccuracies of instrumentation in adjusting the set points to assure that the voltage applied to ESF equipment is not unacceptable.
In your discussion dis-play su ch t ol e ranc e s and error bands and their stack up to assure that the voltage applied to the ESP equipment is not unacceptable.
Another concern is that, after considering the buildup of in-accuracies, etc.,
the nominal setpoint should not be so high as to cause the safety buses to be spuriously disconnected from the preferred power source.
SS3045
INSTRUCTlONS GEH-1768A Su r t a s t o e s G E.H.17 6 6 e
UNDERVOLTAGE RELAYS
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9 99304%
2
Type IAV Undervoltage Relays GEH-1768 g
RECEIVING, HANDLING AND STORAGE These relays, when not included as a part of a packing the relay in order that none of the parts control panel will beshipped in cartons designed to are injured or the adjustments disturbed.
protect t h e m against damage. Immediately upon receipt of a relay, examine it for any damage sus-If the rela s are not to be installed 'mmedi-tained in transit. If inju r y or damage resulting ately they shoufdbe storedin their originalcartons from rough handlingis evident, file a damage claim in a pla c e that is free from moisture, dust a nd at once with the t r a n s p o r t a t i o n company and metaille c h i p s. Foreign matter collected or the omp not e nearest General Electric Appa-outside of the case mayftnd its way inside when the cover is removedand causetrouble in the operation T.easonable e a r e should be exercised in un-of the relay.
DESCRIPTION CASE This cradle is held firmly in the case with a latch at the top and the bottom and by a guide pin at the The case is suitable for eit her surface or back of the case. The cases and cradles are so semiflush panel m ou ntin g and an assortment of constructed that the relay cannot be inserted in the hardware is provided ior eit h e r mounting. The case upside d ow n.
The connecting plug, besides cover attaches to the ca s e and also carries the making the electrical connections between the re-reset mechanismwhen oneis required. Each cover spective blocks of the cradle and case, also locks screw has prevision for a sealing wire.
the latch in place. The cover which is fastened to the case by thumbscrews, holds the connecting plug The case has studs o r screw connections at in place.
both ends or at t h e bottom only for the external ecnnections. T h e electrical connections between To draw out the relay unit the cover is first the relay units and the case studs are made through removed, and t h e plug drawn out. Shorting bars spring backed contact fingers mountedin stationary are providedin the case to.chort the current trans-molded inner and outer blocks between which nests former circuits. T h e latches are then released, a removable connecting plug which completes the and the r ela y unit can be casily drawn out. To f
circuMs. The outer biceks, attached to the case replace the relay unit, the reverse order is followed, have the studs for t h e external ct nnections, and the inner blocks have the terminals for the internal A separate testing plug can be incerted in place connections.
e cf the connecting plug to test the relay in place on the panel either from its or n source of current The r ela y mechanism is mounted in a steel and voltage. or from other sources. Or, the relay framework called the cradle and is a complete unit unit can be drawn out and replaced by another wh3cn with all leadi being terminated at the inner block, has been tested in the laboratory.
INSTALLATION
' LOC ATIO N A DJ US TM ENTS The location should be clean and dry, free from TARGET AND SEAL -IN UhTT du::,1 a n d excessive vibration, ud well lighted to facilitatt inspection and testing.
For trip coils operating on currents ranging from 0.2 up to 2 amperes at the minimum control
)
MOUNTING voltage, set the target and seal-in tap plug in the 0.2 ampere tap.
The relay s hould be mounted on a vertical surface. The outline and panel drilling dimensions The tap plug is t h e screw holding the right-are shown in Fig. I1.
hand stationary c on t a e t of the seal in unit. To change the tap setting, first remove the connecting CONNECT:ONS plugs. Then take a screw from the left-hand sta-tionary c ont a c t and place it in the desired tap.
The 'nternalconnection diagrams are shown in Next, remove the screw from t h e other tap, and Figs. 5 a n d 6. Typical external connections are place it in the left-hand contact. This procedure is shown in Fig. 7.
necessary toprevent the right-hand stationary con-tact from getting out of adjustment. Screws should One of the mounting studs or screws should be not be in both taps at the same time, as d c pickup permanently grounded by a conductor not less than will have a higher tap value, whereas a c pickup
)
No.12 B LS gage copper wire or its equivalent, will be increased.
7 393048 P00ROR8NJ
UNDERVOLTAGE RELAYS TYPElAV g
INTRODUCTION These relavs a r e of the induction-disk con-
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struction. The disk is actuated by a potential oper-n l
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ating coil on a laminated U magnet. The disk shaft carries the moving contact w hic h completes the lj i
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a voltage and its motion is retarded by permanent
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n the shaft as shown in Fig.1. This unit has its coil I
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e in series and its contacts in parallel with the main i
contacts suchthat whenthe main contacts close, the yn
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i l
seal-in unit picks up and seals in. When the seal-in
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latches up and remains exposed until released by
,s pressing a butten beneath the lower-left corner of l\\S hhh I l l I I I i
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the cover.
((Q(KARl l l' l l l IN\\hN\\
J5E*I The r e1a ys a r e all mounted in single unit double end cases. The case has studs for external kfMNNNNX Ql connections at both ends..The electrical connec-
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e through stationary molded inner and outer blocks 2
3 bctween which rests a removable connecting plug (MlW
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which completes t h e circuits. The molded outer I I ' I ' '
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blocks carry the studs for the external connections
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internal connections. The operating coil is con-nected in parallel withboth the upper and the lower inner molded blocks while the trip circuit is con-nocted in series with t h e s e blocks. In this way, f i g.
2 Time-voltage Curves For Relay Types insertion of either the upper or lower connecting lAV54E And I AV5%
plug will energiaethe operating coil bu t t h e t r ip circuit will not be completed until the second con-IAVME repe IAVMF relay is similar to tne Type necting plu g is inserted. For relays which have The T ay e7 cept that it has a longer operating contacts closed when the relay is de energized but open under normal operating conditions, the double time. The time characteristics are shown in Fig.3.
connecting plug feature allows the rela centacts The Type IA\\,54H relay is also similar to the to open before the trip circuit is comp eted, thus Type IAYMF relay except that it has much longer minimizing the possibility of in c o r r e e t tripping operating !!me than either the Type IAl ME cr the when returning the relay to service af ter tests and Type IAVMF relays. The time characteristics are inspection.
shown in Fig. 4.
AP P LiC ATIO N The Type IAV55C relay is similar to the Type IAVME relay except that it has two circult closing These relays are protective devices designed contacts,
to close trip or alarm circuits whenever the voltage The Type IAV55F relay is similar to the T)Te a plied to their operating coils reaches some pre-g.MF @I mg Mt R Ms N hMW determined value. The functions are described in c ontacts.
greater detail in the following par;. graphs, The Type IAV55H relay is similar to the T Te 3
O F ~R ATIN G C H AR ACTERISTIC S IAV54H relay except that it has two circuit closing The Type IAV54E relay has a single circult-closing contact which closes when the voltage is reduced to some predetermined value. Thus, the The Type IAV55J relay is similar to the Type contacts are closed at zero volts. This relay is a IAV55H relay except that it is provided with two time undervoltage relay with inverse time charac-
. separate seal-in units; one for each set of nor-teristics which are shown in Fig. 2.
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SS3049 s
INSTRUCTIONS gel-25372B Surtestets GCI 25372A
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t TEST PLUGS FOR DRAWOUT RELAYS AND METERS Types g
X L A12 A and X L A13 A p#
S93050 POWER SYSTEMS MANAGEMENT DEPARTMENT GENER AL h ELECTRIC PHIL ADELPHI A, PA.
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Fig. 2 tLA13A Test Plug 2
V 993051
TEST PLUGS FOR DRAWOUT RELAYS AND METERS 9
TYPE XLA APPLIC ATIO N not disturb the current transformer shorting ar-rangement. The diagonally staggered binding posts The Type XLA test plu,ts are used to test are numbered. Numbers one to ten, corresponding drawout relays and meters. The XLA12A enables to the relay stud connections, appear up-right when power to be applied to the relay from either a using this plug in the bottom of a relay, while g
sepmte source or the source that feeds the equip-number eleven to twenty appear up-side down.
ment.
The XLA13A can only be used when a Because of its design, the XLA13 test plug cannot separate source of power is available.
be inserted into the bottom of a relay with numbers one to ten up-side down. Thus, the contacts of the inserted plug will always be toward the relay.
XLA12A TESTING
'I h e XLA12A test plug consists of a black Routine testing can be accornplished by re-I #'#
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and red Textolite' melding with twenty electrically bE separate contact fingers connected to ten con-t.cntric bmding posts. The ten contact fingers on XLA 12A the black side are connected to the inside binding posts with :he 1.: lack thumb nuts and engage the relay internal connections.
The contact fingers Several pieces of hardware are supplied with this test plug (See Fig. 6).
The l'-shaped link is on the red side are connected to the outer binding used te make through connections, relav stud to posts with the red thumb nuts and engage the equip-case termmals. The long, open enc link is used to ment case stud connections. See Fig. 1. The con-short circuit any current transformers and any 6
centric binding posts are numbered onthe nameplate, and the correspondmg contact fmgers are numt,cred normally closed ' contacts. This..nk must be in'-
serted in the proptr place under the red thumb on each side of the test plug. When using the test nuts before the tcst plug is inserted in the unit.
plug in the bottom of the relay, numbers one to ten',
corresponding to the relay studs, appear upright Two sizes of corregated end links are provided so sta nda rd test clips can be used. These links are while numbers eleven to twenty are upside down.
11 is impossible, due to its construction, to insert also provided with a hole so that a secure bolted the plug into the bottom of a relay with numbers connection may be obtained.
one to ten up-side down.
By the same token, Tv source test connections and numbers eleven to twenty will always appear in the viring' pical separate up-right position when the plug is m.serted in the diagram for TYPE LAC overcurrent relays tcp of a relay.
are shnwn in Fig. 3.
A e nuntional representation of test con-Removable test links for throuch connection nec md n w mg agrams is sh b test t!tps and short-circuiting clips 'are furnishecj with each test plug. See Fig. 4.
Fig. -. An utime of this plug is shown in Fig.11.
XLA13A XLA13A No external provisions nee: be made for short-0 The xtA 2 3^
test gl=s consists of a e>acx ine ccrr ent traneformer secone ries or anv normativ Textolite* molding with ten electrically separate closed contacts because the plug is so designed that contacts.
E.sch contact terminates at a separate the side away from the relay to be tested does not binding post. See Fig. 2. When the relay connecting come into contact with any of the connecting fingers plug is withdrawn any current transformer second-in the case.
Power source connections can be aries will be short circuited by shorting bars in the secured to the studs of the plug by the black thumb case. The insertion of the XLA13A test plug does nuts.
- Reg. Trade-Mark of General Electric Company 993052 These instructions do not purport to cover all detoils or variations in equipment nor to provide for every possible contingency Ic be met in connection with insfoliotion, operation or maintenance. Should further information be desired or should porticular problems crise which are no* covered sufficiently for the purchaser's purposes, the matter should be referred to the General Electric Company.
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P00R D M
GEI-25372 Test Plugs for Drevout Relays and Meters
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TEST 50JeCE Fig. 3 Typical Separate source Connections and wiring Diagram for Testing an IAC overcurrent Relay Using the ILAl2A lest Plug d
I TEST-CLIP OR SOLTED SHORT-CIRCUlTIN G LINK THROUGH CONNECTION LINK CONNECTION ~ ~ -
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i BLACK THUMB NUT FOR RELAY CONNECTIONS RED THUMB NUT FOR RELAY STUD CONNECTIONS Fig. 4 Test Links in Use on the XLAl2A Test Plug a.# =>
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Test Plugs for Drawout Relays and Meters GE!-25372
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Fig. 5 Typi al Secarate Source t,onnecticns a.9d Wiring Diagra-for Testing an usir.c the XLAl;& Test Plug IAC Overcurrent Relay Typical separate source test connections and wiring diagram for Type IAC overcurrent relays sary harchcare is packed in tae individual carton.
are shown it. Fig. 5.
Immediately upon receipt of the test plug, an examir.ation should be made for any darnage sus-A conventional representation of the XLA13A plug connecticas used on wiring diagran,s is
'ained in transit.
If injury or rough hand!!ng is
.st snown in Fig.10.
evident a damage claim should be filed at once with the transportation company and the nearest Ger.eral An outline diagram of the XLA13A test plug is Electric Sales Office should be notified.
shown in Fig.12.
RENEWAL PARTS SHIPPING UNPACKING orders for renewal parts. should be addressed Type XLA test plugs are shipped in individual to the nearest Sales Office of the General Electric cartons which may be used for storage. All neces-Company, giving the name of part wanted, quantity required and complete nameplate data.
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GEI-25372 Test Plugs for Drawout Relays and Meters BLACK THUMB NUT BLACK SIDE CONTACT-M ARKED RELAY CONNt'CTIONS FINGERS-DO
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RED SIDE RED THUMB NUT MARKED STUD CONNECTIDNS Fig. 7 Sectional View of Xul21 Test Plug Showing internal Wiring ro; REL&v CD'.%ECTioss C.. 1
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99305S
Test Plugs for Drawout Relays and Meters gel-25372
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I Ih ouTunt F;g. 12 Outline of the ILA13A Test Plug SS305W 7
TABLE 1 e'
ANO-1 RUNNING LOADS UPON FULL HOUSE TRANSFER TO ST 1 C o nt r ol R o om Chille r (2)
Instrument Air (2)
S pe nt Fuel P o ol C oole r (2)
Se rvice Wa te r Pump (2)
Makeup Pump (2)
Auxilia ry L.
O.
Pump (1)
React or Building C oole r (2)
Reactor Building C oole r (2)
Relay Room Unit Ci r. (2)
Inve rt e r Tra ns. (2)
. Pipe Heat T ra ci ng (1)
B a t t e ry Cha rge r (2)
Inst. AC T ra ns f o rm e r (2)
Press. 14 t rs.
(2)
Inve rte r T rans. SW. (2)
B a t t e ry Room Extinguishe r Fan (2)
Di scha rge Flume Rad. Monitor (1)
S t a ck Rad. Monit o r F P.
(1)
Prim. Makeup R o om (1)
ICW Rad. Mon. (2)
Service H2O Rad. M onit o r (2)
Au xilia ry Euilding Switchgear (1)
Inst. Ai r D rye r (1)
C om pu t e r Inve rt e r (1)
Auxili a ry B uil di ng Ltg.
(1)
Reactor Building Ltg.
(1)
C ond e ns a t e Pumps (2)
Ci rcu la t ing Wa t e r (4)
N o n-s a f e ty Load Ce ate rs (3) 7 SS3055