ML20092F654
| ML20092F654 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/19/1989 |
| From: | Fitzwater L GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML20092F288 | List:
|
| References | |
| CON-IIT05-002-130D-90, CON-IIT5-2-130D-90, RTR-NUREG-1410 LO-IU-37031-002, LO-IU-37031-2, NUDOCS 9202190455 | |
| Download: ML20092F654 (12) | |
Text
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V0GTLE ELECTRIC GENERATING PLANT INSTR'ICTIONAL UNIT
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1 TITLE:
RECOVER-FROM LOSS OF ALL AC POWER NUMBER:
LO-IU-37031-002 WITII SI REQUZPZ)
.?ROGRAM: LICENSED OPETtATOR REVISION:
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L. RAY DATE:
12/19/89 APPROVED:
DATE:
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1 LO-IU-37031-002-91x Recever From Loss of All AC Power with SI Required PERFCPMd4CE OBJE7tlyL Civen that ac emergency power nas been restor 3d follow $rg a loss of all ac power and a recovery using uafety injection is required, use the engineered safeguarda systems to recover plant conditions.
Preparation for cooldcen and derreonurization must be completed.
All conaunicatiott und activities must be performed in accordance with current, approved procedures.
JNPORMAT1QH This instructional unit addressas licensed operator actions necessary to recover from a loss of all ac power with safety injection required.
After ac emergency power han been restored following a lose of all ac two dif ferent te :hniqyes are available to recover plant conditions.
- power, The technique used to recover plant conditions primarily depends upon how muca RCS conditiens deteriorated during the lose of all ac power event.
If RCS subcocling and pressuriter level are adequate and ECCS equiptoont has not aligned for safety injection, aormal operational equipment can be used to recever plant conditione. This technique is addressed in Procedure 19101.
If eithar RCS subcooling or pressurizar level have been lost, or if ECCS equipment has aligned for safety injection, engineered safequnrds a
ayatema muut be used to recover plant conditions. This techniq2e is addressed in Proceduru 19102.
Entry to Vrocedura 19102 occure f rom step 27 of Precedure 19100 or from steps 5 and 19 of Procedure 19101 when any of the following conditionn exists RCS subcool.ing is 24 degrees F or less (38% adverse containment) o o
Pressurizer level is 9% or less (36% for adverse containment)
Procedure 19102 is also entered from atep 27 of Procedure 19100 if ECCS equipment han aligand to t;ie injection phase upon ac power restoration.
A variety of plant conditions could exist when Procedure.19102 is entered.
Assuming that Procedure 191C2 is entered from Procedure 19100, the following nomLnal condLticna enauld exicts The reactor should be suberitical.
o The steam genarator pressures should he above the o
depressurization limit of Procedara 19100 and stable at 7ho valusa existing when the ac power was restored.
The TDATW pump should be maintaining stext gnneratot o
inventory, The NSFW aystam should-bo operating.
o Required small equipment should be loaded onto the energized ac o
emergency bus.
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l LO-IU-37031-002-01:
Recover From Loss of All AC Power with SI Required One or more of these nominal conditions may not exist if the loss of all ac power was accompanied by a LOCA or SGTR.
Recovering from a Loso of All AC Powet with SI Required NOTE: The CSF status trees should be monitored for inforiaation only until procedura step 9 has been completed.
Because Procedure 19102-1 is entered for loss of all ac power events in which RCS conditions may have experier.ced significant deterioration, one or acre CSF challengen (red or orange conditions) may exist.
Steps 1-9 of Procedure '9102 addreas the critical safety function set as a whole and should be performed before any function recovery procedure is implemented to deal with a specific CSF.
Steps )=9 take into consideration the unique circumstances that accompany 4 loss of all ac power whea starting the safeguards equipment.
PROCEDURE STEP 1 (19102)
ACTION: Verify that the RWST level is greater than 39 percent.
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INTENT 1 This stop ensures adequate RWST inventory for recovery in the safety injection mode.
If the RWST level is less than 39 percent, uwe I
Procedure 19013, " Transfer to Cold Leg Recirculation" - (discussed - in otner training material). After cold leg recirculation is established, go to l
l atep 6 of this procedure.-
l PROCEDURE STEP 2 (19102)
A ACTION: Start one SI pump.
l-INTCNT: Start the SI pump in the_ train that is energised. An SI pump should be start,ed before the other ECCS pumpu because this pump will inject I
as soon as it is-started if RCS pressure is below the pump shutoff head (no l
valve alignment required).
In addition, the SI pump can provide greater flow thr.n a charging pump.
If the secondary depressurization was performed in Procedure 19100, RCS pressure should be below the shutoff-head of,the SI pumps.
PROCEDURE STEP 3 (19102)
ACTION:
Shift the CCP suction from ths-VCT to the RWt'T, i
INTECT: -Becauen the SI signal was reset, these valves would not l
' automat.scally position.- Do not manually initiate safety injection to i
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4 LO-IU-37031-002-01:
Recover From Loss of All AC Powc r with SI Required.
automatically align the valves becauce this might atrip the energitod ac emergency bus or cause f ailure of the bus, especially if power has buen restored by a temporary power supply.
PROCEDURR STMP 4 (19101)
ACTION: Determine whether a CCP shoald be suartsd.
INTENT: Do not start a CCP before the KCP son 1 injection leolation valves
'ars closed. This protects the RCPs from damago caused by the introduction of cold scal injection water to a hot RCP seal area.
s PROCEDbRE STEP 5 (19102)
ACTION:
Manually align tho charging pump flow through the DIT.
INTENT:
With the CCP suction aligned to the RWST, alternats miniflow (which rectreulates to the RWST) should be established.
Open the BIT isolation valves to establish flow through the HIT.
Shut the charging line isolation valves.
In this rituation, it is preferable to inject ECCS flow to all 4 loops through the BIT, rather than to an individual loop to which normal charging flow is aligned.
PROCEDURE STEP 6 (19102)
ACTION:
Verify that the RCP thermal barriers are isolated.
Ih*rINT The RCP thormal barriert shculd be isolated before loading an ACCW pump onto the ac emergency bus.
When ACCW flow is inititted, a rapic cooling of the water in the osal package area of the RCP will occur and cauce seal failure.
In aduftlon, the stagnant ACCW water. in the tharmal barrier heat exchanger may have flashed to steam after ACCW flow was loot.
Restarting the ACCW pumps without having flow to the thermal barrier isolated can result in an exesasive pressure and temperature transient on the ACCW aystem and cusponants.
PROCEDURS STEP 7 (19012)
CAUTION:
When placing loado on a bua powered from a diesel generator, wait until the starting current and voltage drop off; have an operator.
monitor the meters to prevent. tripping the diesel generators.
ACTION:
Manually load specific safeguards equipment onto the energized ac emergency bus.
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LO-IU-37031-002-01: Recover From Loss of All AC Power with SI Required INTENTt The CCW pumps are loaded to provide cooling to the RHR heat uchangers and the $rP heat exchanger.
the ACOW purap will provide cooling to the RCP mc toro, the letdown heat exchangers, and the drain tank heat exchanger.
If' pressure is low caough (possibly because of a large leak),
the MIR pump may be necessary to restore RCS inventory. A contairment fan cooler is loaded in the emergency mode to begin recovery of containment envitonmental conditione.
NOTE:
Steps 1-7 nhould be p,,rformed on the other ac emergency bus when it in energized.
PROCEDURE STEP S (19102)
CAUTION: If the CST lovel decreassa below 15 percent, inadoquate auction pressure muy cause an ArW pump trip.
I CAUTION:
If the steam generator narrow range level lowers in subsequent steps to less than 5 percent (27 percent for adverso containment), and the AFW flow is less than 570 gpm, manually load the MGFW pumps onto the ac emergeticy bus to supply watsr to the stokm generators.
NOTE:
As long as MDArW pap operation is r.ot requ!ced, maintain the s
pump awitches in the PULL-TO-LOCK position to prevent an inadvertent start of thes1 pumps.
ACTION:
Maintcin the steam generatc,r narrow range levels between 5 percent (27 percent for adverse containment) and 50 percent.
INTENT:
This ensures adequate steam generator inventory or feed flow for secondary heat sink requirements. The AFW flow must be control 19d to maintain the steam ganarator narrow range levels.
a Depending upon the status of the energired ac escerqsmey bus, you may load the motor-driven AYW pump onte the bus and revve the turbino-driven purip front nervice as pr.rt of ths subcoquent recovery actions.
PROCEDURE STEP 9 (19102)
ACTION:
Return the contitinment spray pumps to stondby.
INTENT:
Following a losu of all ac power, containment pressure is not anticipated to increase above the contalaunent spray actuation setpoint.
4 The le.as of all ac power analysis in the Westinghouse Cwner's Group bac' ground document for Pec,cedure 19100 shewe that the containment pressure staya under approximately 21.5 psig.
If containment pressure rises above this wot point, the containment spray pumps are permitte' to automatically 2-5
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LO-IU-37031-002-01 Recover From Loss of All AC Power with SI Required I
start on the ennegized ac emergency bus to provide containmer.t cooling.
Manually initiate containment spray if necessary.
NOTE:
After step 9 is performed, the FRPs amy be amplemented to addreau CSF enallenges.
Safeguards equipment has either beca loaded onto the energized ac emergency bus, returned to the standby status.
or maintained in the PULL-TO-LOCK position, depending upon the plant
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status.
Because one ac emergency bus is energized and loaded r
consistent with the prernise of the FRPs, their guidance is now applicablo.
PROCEDOKE STEP 10 (19102) i CAFTION :
E.1tablish RCP thermal barrier cooling slowly to minimize the intreduction of steam into the ACCW system.
Do not establian RCP thermal barrier cooling to any RCP with excescive seal leakage.
After a loss of all ao power event, the hot reactor coolant leaking through the RCP seals w',ll have raised the temperature of the seals and thermal barriers. Establishing ACCW flcw to the thermal barriers after ac power has been restored may cause flaching of the ACCW in the thermal barriers.
If the ACCW Llow is established slowly, the impact l
of the steam formation (and the seal cooling rate) will be minimized.
l Any steam introduced into the circulating loops of the ACCW system can l
be condensea.
Introducing s large volumo of steam could bind portions of the ACCW system ot cauas a water hammer.
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CAUTION:
Establish RCP seul cooling slowly. The rapid introduction j
of cold naal injection water into hot RCP seals will result in thermal stresses that may damage the RC? seals and shaftn.
CAUTIOHs Evaluate the status of the RCP seals before starting any RCP.
The loss of RCP seal cooling that accompanica a loss of all ac power eveat can damage the RCP seals.
Starting an RCP may aggravate l
any damage and significantly increase the reactor coolant leakage through the PCP seals, possibly exceeding the upper limit established in the background document for Procedure 19100 (300 gpm). After exiting this procedure, do not start the RCPn unless an extreme (red) or severe (orange ) CSF challenge is diagnosed. Under a CSF challenge, RCP da.vage is an acceptable consequence if an RCP start 10 required to to mitigate an inadequate core cooling condition.
ACIION:
Establish RCP seal cooling.
INTENT: To prevent further degradat'.on of the RCP sea.is caused by continued leakage of hot reactor ecolant 'hrough thn seale, seal cooling i
l nhould be re-established as soon as possible.
Becaune RCP saal cooling should be established slowly to avoid BCP damoge from excessive thermal 2-6 s
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1,0 IU-37031-002-01:
Recover From Loss cf All AC Power with SI Required sexesses, step.10 is intended to begin'the necessary actions to' restore RCP seal cooling. Proceed to step 11 to continue the recovery while the actions in stop 10 are being completed.
j The denign ACCW flow rate.for RCP thermal barrier cooling is based on removing heat from the reactor coolant leaking through the 9CP seals at a
{
design leak rato.
If seal degradation has occurred and seal leak rates i
have exceedr,d the design leak rate, the design ACCW flow to the RCP thermal i
barriers may not be adequate to remove reactor coolant heat.
Under these=
conditions, establishing ACCW flow to the RCP thermal barriers may for.n a -
significant amount of steam in the ACCW system.
If it is;determinal that one RCP is exhibiting excessive RCP seal leakage, do not establish o?*W.
flow to that RCP unless absolutely _necessary. Should it be necessary.
HV-1975_ seal return header isolatior. -valve may be locally operated.
To locally operate this valve you must go to-its location (South Main Steam.
Valva Poom Upper, Level A), engage the clutch-and turn the handwhee'. to open the valve.-
PROCEDURE STEP. 11 (19102)
ACTION: Transfer to Procedure 19010.
i INTENT:
Procedure 19102 was entered because the pressurizer level and/or
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the RCS subcooling were lost.
The deterioration of-RCS conditions may me the reoult of a LOCA or a steam generator tube rupture coincident witn.the-loss of all ac power. Once the safeguards equipment has been started, j
transfer to Procedure 19010 to diagnose the problem and to identify the correct recovery procedurw.
If symptoms of-thene' concurrent events do not exist and the Si termination criteria are satisfied, Procedure 19010 we.ll direct you to Procedure 19011 to terminate the safety injection.
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e LO-IU+37u21-002-01:
Recovar From 1.oes of All AC Power with SI Required PERPORMANCE CUIDE The following detions are required to recover from a loss of all ac power with safety injections required, Verify that the RWST level in greater than 29 percent.
o 1) 1 procedure step o
Start one SI pump. (procedure step 2)
Shif t the CCP suction fran the VCT to the RWST.
o (procedure step 3)
Determine whether a CCP should be started. (procedure step 4) o Manually align the charging pump flow through the BIT.
o 5)
(procedure step o
Verify that the PCP thermal barriere are leolated. (procedure step 6)
Manually load specific safeguards equipment onto the energized ac o
emergency bus. (procedure otep 7) 4 o
Maintain the steam generator narrow range levele berseen 5 percent j
percent for adverse containment) and 50 percent. (procedure step 8)
(27 o
Return the containn.eSt spray pumps to standby. (procedure step 9)
Eutablish RCP seal cooling. (procedure step 10) o Transfer to Procedure 19010. (procedure utsp.11) o 2-8 B
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I.0-1U-3 7031-002-01 : Recover From Lose of All AC Power with SI Required i
l 1SELF-TEST Answer the following questions as completely as possible.
l
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I 3.
The technique used to recover plant conditions following a loss of all ac power prLmarily depends upon how much RCS conditions deteriorated during the lose of all ac power event.
a.
Truu b.
False 2.
Assume that you entor Procedure 19102 from Procedure 19100 af ter restoring ao emergency power following a loss of all ac power without a LOCA dr SGTR. Indicate which of'the following conditions should exist.
Circle "Y" if the condition should exist and "N"
if the condition will probably not exist.
a.
Y N
Reactor - subcritical b.
Y N
Steam generator pressures - nbove the depressurication limit of Procedure 19100 and stable at the values existing when the ac power was restored.
c.
Y N
The MDAFW pump - maintaining steam generator: inventory d.
Y N
The NSCW system - operating.
e.
Y N
Required small equipment - loaded onto the energized ac emergency bus.
3.
You are recovering from a 1cas of all ac power with SI requLred.
States which ECCS pump you start before the others.
a.
b.
why you start this pump before the others.
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4.
Which of the following would be the MOST LIKELY lamediate result of estab2ishing RCP thermal barrier cooling too quickly in Procedure 191027 I
a.
Introduce steam into-the ACCW system.
b.
Tuerm311y'ahnck the RCP shafts, Sig61ficantly increars the RCS leakage through the RCP seals, c.
possibly exceeding the Westinghouse: guideline upper-limit.
d.
Return to suberiticelity.
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4 LO-IU-37031-002-01:
Recover From Loss of All AC Power with SI Required ANSWEPS 1.
a.
True 2.
a.
Y b.
Y c.
N (TDAFW) d.
Y e.
Y 3.
a.
SI pump b.
Because the SI punp will inject as soon as it is started if RCS precoure is below the pump shutoff head (no valve alignment required) and the SI pump can provide greater flow than a charging pump.
4.
a.
Introduce steam into the ACCW aystem.
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LO-IU-37031-002-01:
Recover From Loss of All AC Power with SI Required 7ASK PRACTICE 1.
Review Pro'cedure 19102.
Be sure that you understand all notes, and steps associated wit' recovering from a loss of ac power with SI required.
2.
Take this instructional unit and Procedure 19102 to the control room or simulator.
Be sure that you can locate all instrumentation associated with recovering from a lose of ac power with SI required.
3.
In the control room or simalator, simulate recovering from a loss of se power with SI required.
If oossible, have a fellow trainee evaluate your performance using Procedure 19102 and this instructional unit.
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f LO-IU-37031-002-01:
Recover From Loss of All AC Power with SI Required FEEDBACK ON TASK P M LqE 1.
If you have any questions about the notes, cautions, or steps in Procedure'19102, ask your instructor.
2.
You should have been able to locate all instrumentation associated with recovering from a loss of ac power with SI required.
If you had any difficulty, ask your instructor for help.
3.
You should have simulated the steps necessary to recover from a loss of ac power with SI required.
If you had any difficulty, re-read the pertinent sections of this instructional unit and the procedure.
Resolve any questions with your instructor.
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