ML20155H625
| ML20155H625 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco, 05000000 |
| Issue date: | 04/12/1985 |
| From: | SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML20155H523 | List: |
| References | |
| RTR-NUREG-1195 PROC-850412, NUDOCS 8605160304 | |
| Download: ML20155H625 (13) | |
Text
{{#Wiki_filter:I ' j 04-12-85 Original WP0050F
, D-0058P -
- RULE 6 . . ,
REACTOR VESSEL THERMAL SHOCX CONSIDERATIONS l l l ", 1.0 Reactor Vessel Thermal Shock Criteria 1
.1 RCS temperature dropped below 500'T and exceeded a 100*F/hr cooldown rate , ) E i RCS temperature dropped below 500*F and RCPs are off and HPI flow exists i through any HPI Injection Valve as indicated on the HPI flowneters (FI-23805, FI-23806, FI-23807, and FI-23808) on H2SFA and H2SF8.
i. I 2.0 Reactor Vessel Thermal Shock Guidelines
.1 If the above conditions are exceeded, perform the following:
.1 Stabilize temperature and pressure below the Inte' rim Brittle Fracture curve. Depressurize.
j .2 Prevent any heatup or p'ressurization for at least three-(3) hours. V .
.3 Contact Station Management. }
] 3.0 Exception *
! .1 The above guidelines should not be followed during an OTSG tube rupture ; in order to limit offsite releases. .
i
?
i l I f . i l END l ~*
)8605160304
,PDR ADOCK86030605000312 S PDR
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L vrEFFECTIVE DATE 11-07-85 Rev. 4 WP0916P [d A D-0003P t.: A.71 INTEGRATED CONTROL 1.0 PURPOSE
.1 To provide arocedures for starting 'up, nomal operation, and shutdown 'of the Integrated Control System (ICS).
.2 To provide procedures for selector l station manual / auto transfers during unit startup, normal operation, and unit shutdown.
.3 To describe the abnormal operation of the integrated control system (ICS) during periods when the unit master control station is in track as a result of a control station, other than the reactor / steam generator demand or the turbine control stations, being in the manual operating mode as a result of an existing abnormal plant operating condition.
2.0 REFERENCES
.1 NNI Instruction Manual Volume 3 f
.2 Rancho Seco Unit 1 ICS/NNI Instruction Manuals Volumes IA,18, and 1C
.3 Rancho Seco Unit 1 ICS Instruction Manual Volume 3 3
.4 Rancho Seco Unit 1 Process Standards
.5 Rancho Seco Unit i Technical Specifications
.6 Rancho Seco Unit 1 Plant Operations Manual Procedures 8.2, 8.3, and 8.4, Plant Startup, Nomal Operation, and Shutdown 3.0 LIMITS AND PRECAUTIONS
.1 When transferring a control station from HAND (MANUAL) to AUTO, depress the auto pushbutton and verify that the auto light comes on.
~
.2 When transferring from AUTO to HAND, depress the hand pushbutton and verify that the hand light comes on.
.3 Prior to placing the Diamond Rod Control Station in AUTO, the following conditions must be met.
.1 The ICS must be energized.
Rev. 4 A.71-1
^
~_ ENCLOSURE 4.9 RANCHO SECO UNIT 1 a.
- '~ .
- OUTSIDE OPERATOR RELIEF CHECKLIST
. Date \Y' (s lRS Shift 02 *3 I To be completed by offgoing EA and reviewed prior to oncoming EA !
assuming the shift. General Information (List equipment 005, any problem areas, etc.) bed M c5n m aonI bvrM 6 Ge4b tL si 'le rs c u m Mom
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Basin Lineup: North
.- Time Oate -
Signtture
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Offgoing EA o 74 4 _
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LNO Rev.18 . AP.23-30
'*-***** * * * * ~ -
1 . SYSTEM STARTUP (Continusd) h 4.2 .18 Place Reactor Demand station in AUTO when Tave is. 582*F. .
.10 Increase Steam Generator / Reactor Demand until turbine bypass valves are >30 percent open.
.20 Place turbine control in OPERATOR AUTO at the turbine control station.
NOTE: The maximum loaTTimit should be set per Procedure 8.2. Section 6.8.1 or at some limit above 20 percent (194 MWe load).
.21 Initially load the turbine to 5 percent load per. A.46, Section 4.3 as specified by B.2, Section 6.0.
.22 Raise the turbine load until the turbine bypass valves are shut.
NOTE: As the turbine load increases the feedwater . control system will switch from OTSG 1evel control to feedwater flow control. This can be observed by an increase in OTSG 1evel (low level alarms will clear).
.23 Place the Turbine Control station in ICS AUTO.
.24 Place steam generator / reactor demand in auto and verify tracking mode is cleared.
NOTE:
. The NSS and turbine are now being controlled from the Unit Master in HAND.
.25 Using the Unit Master, increase the Unit Load Demand (Megawatt Demand) to 193 MWe (20, percent power).
NOTE: The Unit Master station indicating scale is 0 to 100 percent, which corresponds to O to 1250 MWe; f.e., 193 MWe is approximately 15.5 percent full scale (100 percent full power would be approximately 77.4 percent full scale, 967 MWe).
.26 When both OTSGs are off low level limit, set the "aTc" setpoint equal to " unit ATc" and place the load ratio control in AUTO.
.27 The "B" feedwater pump may now be placed in operation as follows:
Rev. 4 A.71-5
. m l -
4.0 SYSTEM STARTUP O .1 Energizing the ICS ha Initial Conditions
.1 The ICS is de-energized. .
.2 120 Volt AC Vital System Inservice per OP A.62.
.3 No maintenance is being performed on the ICS which would preclude
- system operation. .
ICS disconnect breakers to fan bus are cpen.
.4
.5 ICS disconnect breakers to vital busses C and J are open.
.6 Switches S1 and S2 on the ICS power auctioneer panel are open.
Procedure
.7 Close the ICS disconnect switches to the fan bus.
.8 Close vital bus C breaker C07.
.9 Close inverter J breaker J04.
f .10 Reset the auto transfer breaker (H8DICS); this lines up power to the
\. ICS from vital Bus C. Power is provided from the J Bus when the auto transfer breaker is tripped. .
- .11 Close the disconnect switches'Si and S2 on the ICS power auctioneer 4H panel, located in ICS Cabinet 3, south side.
CAUTION: Do not close the disconnect switches to the ICS, NNI and RPS, and SFAS cabinet prior to closing the main vital bus disconnect breakers. The combined inrush current for all three of these loads may damage the vital bus inverter. Any two of these loads may be started simul-taneously with no concern due to inrush effects.
.12 Verify that all power supply monitor (PSM) lamps are on, thus indicating that all DC supplies and DC busses are operating
! normally. If any of the PSM lamps are not on, determine the cause of difficulty and rectify it before proceeding.
.13 Check fuse panel for blown fuse indications. If any fuses are blown, proceed only after correcting fault or determining that plant operation is permissible with existing conditions.
Rev. 4 A.71-3 5 4
, , -. , - - ~ -
l NORMAL OPERATION (Continued) ( 5.8 HANO-AUTO Stations ,
.1 A HAND-AUTO Station consists of:
.1 A setpoint, or bias circuit; if neither are required they are omitted for that function.
.2 A RAISE-LOWER toggle switch for HAND operation of the control element which follows the selectur station.
.3 Two pushbuttons, one marked "AUT0" the other marked " HAND."
.4 Two indicating lights which indicate; j
.1 The station is in AUTO control when the red indicating l light is "0N." l
.2 The station is in HAND (MANUAL) control when the white indicating light is "0N."
.3 In some cases, both the " AUTO-HAND" indicating lights may ,
be "0N." This indicates that the operator has no control ' from that station; the ICS is controlling.
- .5 An indicating meter with a two position switch so that the meter i f-~ may be read:
.1 Measured Variable (up position).
4
.2 POS or Following Element (down position).
.2 Control Station
.1 The following is a list of the functional control stations, on the console, and what the measured variable indicates and position (POS) indicates. Routinely all stations are left in the POS position.
NOTE: All Control Station indicating scales are O to 100 percent; the ranges / units listed below for each station correspond to O to 100 percent scale indication.
.1 Unit Master - Meas. Var - Actual Unit Load Demand (0-1250 MWe)
POS - - - - Unit Load Demand Setting (0-1250 MWe) . Q:. : Rev. 4 A.71-9
. _ - - . -- =
NORMAL OPERATION (Continued) A G 5.2 .4 If a system upset occurs while the turbine control is in HAND, match the turbine valve position with the existing generated megawatts until a steady state condition exists.
.3 Turbine Followfog Mode
.1 With the turbine control station in ICS AUTO and the Steam Generator / Reactor control station in HAND, the mode of control is Turbine Following (TRACKING). This control mode is characterized by relatively slow unit response, but very accurate and rapid Turbine Header Pressure control.
.2 The operator establishes the generation manually by changing the steam generator / reactor control station.
.4 ICS Baron Controller
.1 The Boron Controller provides automatic termination of continuous feed and bleed operation at regulating CRA group nominal position.
.5 Rate of Change
.1 The rate of load change is adjustable from 1 MWe to 99 MWe (0.25-10 percent) per minute, for all loads between 193 and 870 MWe (between 20 and 90 percent load; basis is 100 percent load equals 967 MWe).
r
.2 Above 870 MWe and below 193 MWe, the rate of change is automatically fixed at a rate of 1 48 MWe per minute (1 5 percent per minute).
. .3 EXAMPLE: A 20 percent (193 MWe) load to 30 percent (290 MWe) load increase is as follows:
.1 Time desired for the increase to be completed is 5 minutes.
.2 The load change is 97 MWe, the rate of change is:
Rate = 97 MWe = 19 MWe/ min 5 min.
.3 Set rate of change to 19 MWe/ min, and High Load limit to 290 MWe.
.4 Increase Unit Load Demand at the Unit Master Station to desired value. The load will increase from 193 MWe to 290 MWe at a rate of 19 MWe per minute, and will stop at the set target load.
.5 The Unit Load Demand and High Load Limit may be adjusted as desired.
C. b Rev. 4 A.71-7 1 m
~ .
ABNORMAL OPERATIONS (Continued) !O \w2 7.2 TRACKING
.1 TRACKING is defined as the mode of operation, when due to some abnormal condition, the unit is being limited in its production of megawatts. In order to maintain coordination of all control variables, the unit must track, or follow, the limited condition.
.2 In the TRACKING mode, the actual generated megawatts is used as an ,
indication of sne limited condition. The unit demand will follow the ; generated megawatts in order to maintain the proper relationship - between those stations in automatic and any one station in manual, except for reactor trip, cross-limits, or load rejection.
.3 Any one or more of the following abnormal conditions will cause the ICS to go into the TRACKING mode:
.1 Unit under cross-limits. (The difference between reactor power and reactor demand exceeds plus or minus 5 percent of 100 percent reactor power, or the difference bewteen feedwater demand and feedwater flow exceeds plus 5 percent of 100 percent feedwater flow.
.2 Transfer of both Feedwater Demand control stations to HAND. l
.- .3 Transfer of either the Dia' mond Rod Control station or'the
- ( Reactor Demand control station to HANO.
t =..
.4 Reactor tripped.
- .5 Tripping of both generator breakers.
{
.6 Steam-Generat' o r/ Reactor Control station in HANO.
.7 Turbine Control station not in "ICS AUTO."
.3 Cross Limits
.1 Reactor control - If feedwater flow drops more than 5 percent below feedwater demand, reactor power will be reduced slightly more than 5 percent .to return to the *5 percent control band.
.2 Feedwater control - If reactor power changes mor's than *5 percent of reactor demand, feedwater demand will be changed accordingly to keep the system within the control band of *5 percent.
A - Rev. 4 ~ l A.71-13
. - , _ _ , . _ _ _ , _ . . . _ , . . . . . . _ ..~,..,,,,..,,,____Q,_.~
NORMAL OPERATIONS (Continued) O 5.8 .2 .1 .8 Feedwater Demand Loop A and B
./ Meas. Var - Error between HAND and AUTO demand t
(HAND mode only, -50 percent to
+50 percent demand error). Loop feedwater demand (AUTO mode only, l 0 to 100 percent demand). l l
POS - - - - Feedwater demand (0 to 100 percent Feedwater demand). ,
.9 Feedwater Pump A and B 1 Meas. Var - Error between HAND and AUTO pump l destod (HAND mode). Difference acren analog memory (AUTO mode,
-50 to +50 psi feed valve delta P error).
POS - - - - Main feedwater pump speed demand (0 to 100 percent demand). i
.10 Auxiliary Feedwater Valve A and 8 Meas. Var - Feedwater level setpoint in steam generator (0 to 100 percent of setpoint (transmitter) range).
F - POS - - - - Emergency feedwater valve position demand (0 to 100 percent demand).
.11 Steam Generator Load Ratio (Delta Tc)
T - Meas. Var - Reactor Delta Tc error (-10 to
-- +10*F).
POS - - - - Steam generator load ratio (-10 to +10 F). l
! 6.0 SYSTEM SHUTOOWN
.1 De-energizing the ICS Initial Conditions
.1 Reactor cooled down and on decay heat (i.e., no feedwater is required to the steam generators). -
Procedure I
.2 Open disconnect switches Si and S2 on the ICS power auctioneer
- pane.l. This turns off all ICS AC power.
. Rev. 4 A.71-11
- OP A.71 4 Enclcsura 1 NEUTRON POWER VERSUS IOOP FEEDWATER FIOW
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Rev. 4 l A.71/ 17 . r i
ABNORMAL OPERATIONS (Continued) O 7.5 .6 Neutron power versus loop feedwater flow for steady state operating conditions is shown in Enclosure 1.
. s. .
.7 The Diamond Rod Control station, if in HAND, cannot be transferred to AUTO if a neutron error greater than plus or minus 1.0 percent of 100 percent neutron power exists. If the Diamond Rod Control station is in AUTO, the neutron error should be maintained less than 1.0 percent of 100 percent neutron power by the ICS.
.8 The Diamond Rod Control station should not be switched to AUTO unless Tave error is reduced to near zero. .
.9 If a system upset occurs while the Reactor Demand control station or the Diamond Rod Control station is in HAND, match the neutron power with the existing generated megawatts until a steady state condition exists.
Neutron power versus generated megawatts for steady state operating conditions is shown in Enclosure 3.
.6. Tripping of Both Main Generator Breakers
.1 ICS goes into TRACKING mode.
r .2 When both main g'enerator breakers open, the unit is separated from all offsite loads. A runback at a rate of 20 percent per minute to f- 15 percent (145 MWe) power will be initiated to reduce steam g~ production and avoid a reactor trip. When Unit Load Demand is
'. - reduced to 15 percent power, the turbine bypass valve bias is T removed; the valves will operate at the Turbine Header Pressure
-l Setpoint.
.7 Reactor Trip
.1 ICS goes into TRACXING mode.
.2 When a reactor tripped condition occurs the Unit Load Demand tracks the actual generated megawatts at a rate of 20 percent per minute.
.8 The Following Limiting or TRACKING Conditions Are Light Annunciated on the Control Console, for the Operators Information.
.1 Reactor coolant pump
.2 Reactor co'lant o flow
.3 Asymeteric rod j
.4 Feedwater pump Rev. 4 A.71-15
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