ML20129D657

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Temporary Mod Requests T-8955,T-8942 & T-8077 to Sys Procedure Sp 1105.03, Safety Features Actuations Sys
ML20129D657
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 03/06/1985
From: Lammon G, Lee D, Ricci D
TOLEDO EDISON CO.
To:
References
SP-1105.03, NUDOCS 8507300128
Download: ML20129D657 (19)
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i 7 BISTABLES CTMT Radiation CTMT Pressure Hi CTMT Pressure Hi Hi BWST Level Lo 5.2.11 If the RCS pressure is below 280 psig the trip light on the DH valves permission to operate bistable should be on.

5.2.12 If the RCS pressure is below 800 psig the trip light j on the CF valves permission to operate bistable should

! be on.

5.2.13 Run those sections of the SFAS Monthly Test, ST 5031.01 which are applicable to the present mode.

5.2.14 Perform ST 5099.01 " Miscellaneous Instrument Shift Check" on the affected channel (s).

5.2.15 Return the SFAS door key to the Shif t Supervisor.

Date Section 5 Completed

6. DEENERGIZING A STAS CABINET

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NOTE: See Precaution and Limitation 3.5 and 3.6.

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NOTE: AC or DC power may be left on if desired by the Shift Superviso r. .

6.1 Prerequisites 6.1.1 A situation exists requiring that a SFAS cabinet be deene rgized . (,afras g Acy /Ac. /,.,Jf4 44.Mff y M -bLo{nSM ,//W ,k H , Q e+- 6.1.2 Ifthemainsteamisofationvalvesaeopen, verify .

that both solenoids are energized ( W green lights s $FA S M should be on).

6.1.3 In the three (3) cabinets NOT being deenergized all output modules and output relays are in service and there are NOT any bistable trips except that the RCS pressure bistables may be tripped if blocked.

In the three cabinets that are to remain energized 10 verify that one of the following conditions exist.

a) All output modules are reset, all output relays

are in service and all histables are reset.

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I o SP 1105.03.10 f 77 i b) All output modules are reset, all output relays ,

are in service and all bistables are reset except .

l *x for the RCS pressure bistables which are blocked. -

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I c) For any other conditions contact the I&C Engineer

for guidance.

6.1.4 The Shift Supervisor has given permission to deenergtze the SFAS channel and has issued one SFAS door key.

6.2 Procedure ,

t CAUTION: This procedure will NOT remove all power from the SFAS cabinet. Consult the I&C Engineer if all power must l

be off.

6.2.1 Turn the range switch on the Victoreen model to the off position.

6.2.2 Turn the AC switch on the SFAS Channel to the OFF position. (Switch is in back) 6.2.3 Trip the AC ::d "^ essential instrument breakers for

  • the affected cabinet only, as per the following tablet SFAS CAB AC BREAXER BC BREAXZ1t  ;

- 1 Y 107 IP 2 Y 207 D. 19

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Y 307 Y 407 P 9 2P 1 h*2*Y CAUTION: Opening the DC breaker will remove power from valves % fused in the

% ^A Ur J h// $% A Hang tags on the switches'/ breaker,s tripped in 6. . (s. '

6. 2. A'f and 6.2.4 6.2.f[ Return the STAS door key to the Shif t Superviser. ,Ml Section 6 Completed by Date bfMk NY
7. STAS CABINET OPERATION DURING RCS PRESSURIZATION g[g 7.1 Prerequisites g p)f)7

! NOTE: During RCS heatup section 7 must be completed to ON IT prevent equipment actuation. Y 0)f ){

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j gN Davis-Besse Nuclear Power Station SP 1105.03 ,

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System Procedure: SP 1105.03 SAFETY FEATURES ACTUATION SYSTEM i 4 **

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1 SP 1105.03.8

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1. PURPOSE 1.1 To detail the procedures necessary to perform the following operations associated with the Safety Features Actuation System, (SFAS).

Energization and Reseting the SFAS Cabinets Section 5.0 Deenergizing a SFAS Cabinet Section 6.0 STAS Cabinet Operations during RCS Pres- Section 7.0 surization SFAS Operations during RCS Depressurization Section 8.0 CTRM Operating Switches and Indications Section 9.0 Deenergizing and Reenergizing the SFAS Section 10.0 Solenoid Valves 8

2. DISCUSSION . .

The purpose of the Safety Features Actuation System is to auto-natically prevent or limit fission product and energy release from the core, to isolate the containment vessel (CV), and to initiate the

<' operation of the ESF equipment in the event of a loss of coolant

k. . accident. The SFAS performs this by monitoring the CV radiation 8 level, the CV prensure and the RCS pressure initiates the operation of the appropriate equipment when any two or more of the four sensors for any parameter sense a value which exceeds the trip setpoint. The equipment which is actuated is listed on Bechtel Drawing E178 (6 sheets) and the logic for this actuation is shown on Bechtel Drawing E-16 (2 sheets).

Other station procedures which pertain to the SFAS are:

2.2 ST 5099.01, " Miscellaneous Instrument Shift Checks" which checks the input parameter for correct value for the plant status and between channels.

2.3 ST 5031.01, "SFAS Monthly Test" which checks one channel per week for correct logic and setpoint. This procedure also discusses and uses the switches and indications in the cabinets.

2.4 ST 5031.07, "SFAS Refueling Period Test" is an integrated test of the entire SFAS including operation of the controls.

2.5 ST 5031.02, 5031.03, 5031.04, 5031.05 are calibrations of the RCS pressure, CTNT pressure, CTMT radiation, and BWST level sensors each refueling period.

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2 SP 1105.03.11 ,

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j 2.6 ST 5031.17, SFAS Sequence Logic Channels Operable, which provides S .

' a monthly check of a) essential bus feeder trip undervoltage 1 l

} relays, and b) diesel generator start, load shed on essential

bus undervoltage.  ;

, 11l 2.7 ST 5031.06, SFAS Overall Time Response.

! 2.8 EP 1202.06, " Loss of RC and RC Pressure" explains the actions to

,j take on a SFAS trip including spurious trip.

3. PRECALITIONS AND LIMITATIONS 4

l 3.1 During RCS (Reactor Coolant System) heatups or cooldown it is l i mandatory that section 7 or 8 respectively of this procedure be j performed between RCS pressure of 1800 and 1600 psis (cooldown),

j 1600 and 1800 peig (heatup), between 600 and 400 psig (cooldown) j and 400 and 600 peig (heatup). Otherwise a trip will be generated .

and appropriate equipment will be actuated.

i 3.2 If it is necessary to deenergize a SFAS channel, all operators should be aware that the system is in a one out of three trip logic and that the possibility for an inadvertant trip due to

equipment failure is more likely.

1 2

3.3 If an SFAS level 2 trip has occurred and the EDG's are supplying ,

C-1 and D-1 buses, DO NOT reset SFAS until offsite power is .

restored, y j - .

l 3.4 Whenever a channel is deenergized the output relays in that l J channel are deenergized. For this reason the monthly test can L

! NOT be performed on the complementary channel as this would trip i' the ESF equipment for that actuation channel. Channels 1 and 3 L i are complementary as are 2 and 4. In addition the monthly test l on the SFRCS (Steae & Feedwater Rupture Control System) cannot j 11l be performed during the testing.

4 l 3.5 Deenergization of two or more SFAS channels is not covered 7

by this procedure. If the situation ever develops a special

) procedure must be written to cover this evolution.

i j 3.6 If an STAS actuation occurs, the following requirements apply:

i 11l 3.6.1 If an SFAS signal to certain ESF equipment is " BLOCKED" .

3' (i.e. overridden), that equipment is incapable of L responding to either any subsequent autoestic actuation j signal or the systes-level manual actuate (" TRIP")

pushbuttons. Before an operator " BLOCKS" any SFAS -

i signal, he must assure that the safety function of that equipment is no longer needed. Afterward the 1

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3 SP 1105.03.9 (q . \

operator is totally responsible for the proper operation of that equipment, including re-actuation if required, until the " Block" is removed.

9 Re-actuation, subsequent to a " BLOCK", can be accomplished two ways. First, at the equipment level, " BLOCKED" equipment will respond to the individual control switches for that piece of equipment. Second, at the SFAS system level, operation of the system-level

" RESET" pushbutton (on Panel C5717) will clear any output logic " BLOCKS" in the system. (Output logic

" BLOCKS" are the block switches next to the SAM lights and on the output modules). The equipment will then respond to the system level manual actuate (" TRIP")

pushbutton and to automatic actuation signals.

3.6.2 DO NOT OVERRIDE ANY SAFETY EQUIPMENT EXCEPT AS LISTED BELOW:

1. RCS Makeup - The RCS makeup isolation valve may be overridden to the open position when RCS pressure is greater than 400 psig.
2. Reactor Coolant Pump (RCP) Seal Injection and Return - The RCP Seal Injection and Return

('~ . Isolation Valves may be overridden to the open t position when RCS pressure is greater than 400 paig.

3. RCS Letdown - The letdown isolation valve may be opened as required to control RCS inventory when the RCS pressure is greater than 400 psig given that no seismic event occurred.
4. Containment Gaseous and Particulate Monitors Sample Lines - The associated sample line isola-tion valves may be opened as soon as it is necessary to sample the CV.
5. Decay Heat (DH) Cooler Outlet Valves - The DH cooler outlet valves may be throttled in the event of a failure of one DH pump which then requires the remaining pump feed through both Low Pressure Injection (LPI) lines.
6. High Pressure Injection may be stopped or throttled provided:

(1) All hot and cold leg temperatures are at least 50 degrees below the saturation temperature for the existing RCS pressure s

4 SP 1105.03.9 ,

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and NOT more than 50*F above the secon- c' dary side saturation temperature. The .

degree of subcooling beyond 50*F and the length of time HPI is in operation shall be limited by pressure / temperature con-siderations for vessel integrity (when below 400*F).

(2) Pressurizer level is being maintained.

CAUTION: Do NOT rely entirely on pres-surizer level indication to l determine the inventory of'the RCS, If the RCS temperature is NOT 50 degrees below the saturation i

temperature for the RCS pressure,

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a steam void may exist in the RCS.

If both of these conditions are satisfied, the

-EPI may be stopped by blocking and stopping these pumps. .

CAUTION: If 50*F subcooling cannot be maintained after stopping HPI, the HPI shall be restarted. ,

HPI may also be throttled if the flow exceeds '

900 gym per pump. This would occur during the latter stages of 'depressurization. HPI flow may

- be stopped if both low pressure injection pumps are in operation with a flow of at least 1000 gym per pump, and the RCS conditions have been stable for 20 minutes.

7. Component Cooling Water Valve to Makeup Pump -

The CCW to Makeup Pump Valve may be pverridden to i the open position when RCS pressure is greater i than 400 psig given no seismic event occurred.

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8. Diesel Generator - If a diesel was previously being operated on the hydraulic governor, it 4

may be blocked, stopped, and restarted in the

" safety mode".

9. Atmospheric vent valves - The atmospheric vent valves may be opened if required for secondary pressure control.

9 10. If plant conditions are stable at normal operating or hot standby conditions after a transient with

r 5 SP 1105.03.11 k ,*,

no evidence of an RCS leak, systems may be bypassed with the Shift Supervisor's permission.

11. If there are any questionable conditions or any sign of an RCS leak, no safety system should be bypassed without approval of Station Management (Station Superintendent or his designee).
4. REFERENCES (TS) 4.1 Technical Specifications 3.6.1.1, 3.6.1.2, 3.6.1.7, 3.6.3 Ill 4.2 USAR Section 7 4.3 SFAS Instrumentation Manual - Consolidated Controls Corporation 4.4 AD 1803.00, " Safety Tagging" 4.5 E17B, SEAS Actuated Equipment Tabulation - Bechtel 4.6 E16B, SFAS Signal Diagram - Bechtel ,

4.7 EP 1202.06, Loss of RC and RC Flow

5. ENERGIZATION AND RESETTING THE SFAS CABINETS l () 5.1 Prerequisites NOTE: If an SFAS Level 2 trip has occurred and the EDG's are supplying. C1 and D1 buses, DO NOT reset SFAS until offsite power is restored.

5.1.1 Essential instrument AC and DC distribution panels are energized for the affected cabinet (s).

SFAS CAB AC PANEL DC PANEL 1 Y1 D1P 2 Y2 D2P 3 Y3 DIP 4 Y4 D2P 5.1.2 The Shift Supervisor has given permission to energize the cabinet and has issued one SFAS door key.

5.2 Procedure 5.2.1 Check that the AC switch on the SFAS cabinet is "0FF".

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6 SP 1105.03.8 . .g 5.2.2 Check that the Victoreen module range switch is off.

5.2.3 Clear tags from the associated breaker and close the essential instrument AC breaker according to the following:

SEAS CAB BREAKER 1 Y 107 2 Y 207 3 Y 307 4 Y 407 5.2.4 Close the essential instrument DC breaker accord-ing to the following:

SFAS CAB BREAKER 1 D1P 18 2 D2P 19 3 DIP 19 4 D2P 18 5.2.5 Place the AC switch in the back of the SFAS cabinet to the "0N" position.

8 5.2.6 Turn on the Victoreen module and place the range .'-

switch at "ALL". Wait approximately one minute or until the indication on the module has stabilized and .;)

then dep.ess the red and yellow pushbuttons if on and they should so out. Then depress the green pushbutton if off and it should come on.

5.2.7 If the RCS is depressurized, the RCS pressure LO block and Lo Lo block bistable should be tripped. Depress the block pushbutton on the front of these modules and ensure that the " Block" light comes on.

5.2.8 If the RCS pressure is above 400 psig depress the reset pushbutton'on the RCS pressure Lo Lo bistable, trip light should go out.

5.2.9 If the RCS pressure is above 1600 psig depress the reset pushbutton on the RCS pressure Lo bistable, trip light should go out.

5.2.10 Depress the reset pushbutton on the following bistables if tripped and any tripped output modules and verify the trip lights, all 1/5, and all output module block lights are off.

. .o 7 SP 1105.03.10

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5. , BISTABLES C1HT Radiation CTNT Pressure Hi CTMT Pressure Hi Hi BWST Level Lo 5.2.11 If the RCS pressure is below 280 psig the trip light on the DH valves permission to operate histable should be on.

5.2.12 If the RCS pressure is below 800 psig the trip light on the CF valves permission to operate bistable should be on.

5.2.13 Run those sections of the SFAS Monthly Test, ST 5031.01 which are applicable to the present mode.

5.2.14 Perform ST 5099.01 " Miscellaneous Instrument Shift Check" on the affected channel (s).

5.2.15 Return the SFAS door key to the Shift Supervisor. ,

Section 5 Completed _Date

6. DEENERGIZING A SFAS CABI E NOTE: See Precaution and Limitation 3.5 and 3.6.

NOTE: AC or DC power may be left on if desired by the Shift Supervisor.

6.1 Prerequisites 6.1.1 A situation exists requiring that a SFAS cabinet be deenergized.

6.1.2 If the main steam isolation valves are open, verify that both solenoids are energized (local green lights should be on).

6.1.3 In the three (3) cabinets NOT being deenergized all output modules and output relays are in service and there are NOT any bistable trips except that the RCS pressure bistables may be tripped if blocked.

10 In the three cabinets that are to remain energized verify that one of the following conditions exist.

l a) All output modules are reset, all output relays l are in service and all bistables are reset.

l I

8 SP 1105.03.10

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10 b) All output modules are reset, all output relays  ;!

are in service and all bistables are reset except for the RCS pressure bistables which are blocked.

c) For any other conditions contact the I&C Engineer for guidance.

6.1.4 The Shift Supervisor has given permission to deenergize the SFAS channel and has issued one SFAS door key.

6.2 Procedure CAUTION: This procedure will NOT remove all power from the SFAS cabinet. Consult the I&C Engineer if all power must

be off.

6.2.1 Turn the range switch on the Victoreen model to the off position.

6.2.2 Turn the AC switch on the SFAS Channel to the OFF .

position. (Switch is in back) 6.2.3 Trip the AC and DC essential instrument breakers for the affected cabinet only, as per the following table:

SFAS CAB AC BREAKER DC BREAKER ._j 1 Y 107 D1P 18 2 Y 207 D2P 19 3 Y 307 D1P 19 4 Y 407 D2P 18 CAUTION: Opening the DC breaker will remove power from valves NOT fused in the cabinet.

6.2.4 Hang tags on the switches / breakers tripped in 6.2.3 and 6.2.4.

6.2.5 Return the SFAS door key to the Shift Supervisor.

Section 6 Completed by Date

7. SFAS CABINET OPERATION DURING RCS PRESSURIZATION 7.1 Prerequisites NOTE: During RCS heatup section 7 must be completed to prevent equipment actuation.

i

r 9 SP 1105.03.8 7.1.1 The RCS is being pressurized.

7.1.2 The Shift Supervisor has issued one SFAS door key.

7.2 Procedure 8 7.2.1 At a RCS pressure of approximately 301 psig, verify that the trip light on the two DH valve permission to operate bistables go off.

7.2.2 At a RCS pressure between 400 and 550 psig, depress the reset pushbutton on the RCS pressure Lo Lo trip bistable in SFAS channel #1 and verify that the trip light goes off.

7.2.3 Repeat 7.2.2 in SFAS Ch 2 7.2.4 Repeat 7.2.2 in SFAS Ch 3 7.2.5 Repeat 7.2.2 in SFAS Ch 4 CAUTION: Do NOT pressurize above 550 psig until at least three of the steps 7.2.2 through 7.2.5 are satisfactorily completed to prevent an inadvertent actuation.

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7.2.6 At a RCS pressure of approximately 800 psig, verify that the trip light on the two CF valve permission to operate bistables go off.

7.2.7 At a RCS pressure between 1600 and 1750 psig, depress the reset pushbutton on the RCS pressure Lo trip bistable in SFAS channel #1 and verify that the trip light goes OFF.

7.2.8 Repeat 7.2.7 for SFAS Channel #2 7.1. 9 Repeat 7.2.7 for SFAS Channel #3 7.2.10 Repeat 7.2.7 for SFAS Channel #4 CAUTION: Do NOT pressurize above 1750 psig until at least three of the steps 7.2.7 through 7.2.10 are complete to prevent an inadvertent actuation.

7.2.11 Return the SFAS door key to the Shift Supervisor.

8. SFAS OPERATIONS DURING RCS DEPRESSURIZATION 8.1 Prerequisites

)

10 SP 1105.03.10

c's NOTE
During RCS cooldown Section 8 aust be completed to ,

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prevent equipment actua. tion.

10 8.1.1 The RCS is being depressurized.  !

8.2 Procedure i

NOTE: Blocking of "SFAS RC PRESS" within this procedure is  !

> intended to prevent an inadvertant initiation of SFAS  ;

during normal depressurization. The operator must j note that changes in plant conditions may warrant the .

initiation of SEAS. This is the responsibility of the operator performing the block. SFAS initiation on j high containment pressure, high containment radiation i

and from the manual actuation switches will function normally with the RCS low pressure " BLOCKS" in. To '

asaually actuate the SEAS in response to RCS low
' pressure the operator can actuate 'all the necessary equipment for the required incident level component by component from each component control switch OR manual actuation at the system level from the manual actuation .

switches as described in Step 9.2.5.

4 3

8.2.1 Upon receipt of the "SFAS RC Press <1800 psig Blk 4 - Permit" alarm, depress the Lo RC Pressure trip block  ;

i pushbuttons (4) on CTRM panel C5705 and verify that on 7,' l l the RC Pressure Lo block bistables (4-on per channel), y. l the block light is on.  ;

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CAUTION: 1Do NOT depressurize below 1650 psig before this step is satisfactorily completed on at least three SEAS channels to prevent an inadvertent actuation.

8.2.2 Verify that at a RCS pressure of approximately 795 4

psig, that the trip lights illuminate on the CF valve permission to operate bistables (2).

NOTE: The CF tank isolation valves can now be closed.

l 8.2.3 Upon receipt of the " STAS RC Pressure <600 psig Blk Permit" alarm, depress the Lo Lo RC Pressure trip block pushbuttons (4) on the CTRM panel C5705 and

. verify that on-the-RC Pressure Lo Lo block bistables (4 - one per channel), block lights is on.

CAUTION: Do NOT depressurize below 450 psig before this step is satisfactorily' completed on at least three SFAS channels to prevent an inadvertent actuation.

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11 SP 1105.03.9 8.2.4 Verify that at a RCS pressure of approximately 275 psig, that the trip light illuminates on the DH valve permission to operate bistables (2).

NOTE: DH-11 and DH-12 isolation valves may be opened.

9. CTRM OPERATING SWITCHES AND INDICATIONS (Normal Operation) 9.1 Prerequisites None, this is a discussion section.

9.2 Procedure 9.2.1 The block switches on panel C5705 are to allow the RCS to be depressurized without having a SFAS trip. (See Section 8).

9.2.2 The block switches on panels C5715, C5716, and C5717 (An'oer light and white pushbutton) are to permit the .

operator to take manual control of the ESF equipment after a SFAS trip using the normal control switches.

The amber light is referenced to as the " SAM" light.

(See 9.2.4).

4 6

  • . :/ 9 NOTE: Re-actuation, subsequent to a " BLOCK", can be accomplished two ways. First, at the equipment level, " BLOCKED" equipment will respond to the individual control switches for that piece of equipment. Second, at the system level, operation of the system-level

" RESET" pushbutton will clear any output irgic " BLOCKS" in the system. (Output logic

" BLOCKS" are the block switches next to the SAM lights and on the output modules.) The equipment will then respond to the system level manual actuate (" TRIP") pushbutton and to automatic actuation signals.

9.2.3 The input parameter meters are on panel C-5716 and show the value the SFAS is receiving from the field transmitters.

9.2.4 The SAM (Safety Actuation Monitoring) lights are designed to aid the operator to quickly determine the situation after a SFAS trip. They have a total of eight possible conditions, however, only four of these are relevant to plant operation. They are: ,

l

. . - .. .- .. - _ . . . . - - . --- . _ ,_ . -- . . - ~ .-

j 12 SP 1105.03.11 4- -,

LIGHT STATUS CONDITIONS } i 0FF No SFAS trip or SFAS trip and the >  ;

1 Equipment did NOT operate  ;

i- DIM SEAS trip and the equipment oper-i ated properly e

i BRIGHT Dim conditions plus the block switch has been depressed indicat-ing that the operator can take i normal control of the component l

t FLASHING Bright conditions plus the equip-ment has been placed in its NON-Safety actuated position.

4 9.2.5 If No output logic is " BLOCKED", manual actuation of SFAS may be accomplished as in the. following Steps 1, -

2, and 3._ If ANY output logic is " BLOCKED", proceed directly to Step 9.2.6.

11l 1. To manually actuate all SFAS equipment except -

for the Containment Spray Pumps depress the manual actuation pushbuttons (2) labelled SFAS (HIS 2022 and HIS 2023) on C-5717. Each push-button actuates approximately one half of the ss l ESF equipment. ,)

2. To actuate the Containment Spray (CS) Pumps, '

depress the manual actuation pushbutton (2) labelled SPRAY on C-5717 (HIS 2020 for CS 1-1 and HIS 2021 for CS 1-2).

4 3. To reset the above trips, first press the OFF i button located on the trip switch itself (this clears the trip signal); then depress the reset pushbuttons located next to the trip switches (this resets the output modules).

9.2.6 If ANY output logic is "BLOCIED", press the reset pushbutton located next to the manual trip switch to 4 clear the " BLOCK" and then return to Step 9.2.5.

10. DEENERGIZING AND REENERGIZING THE STAS SOLENOID VALVES 10.1 Prerequisites 10.1.1. Maintenance is to be performed on one or more of the STAS solenoid valves. ,

r i.

. . . , . .. -. - - - - . . . - , . . _ _ . - _ _ . _ , _ . - - , - . - . , . . . .- .m - - , . . . - _ _

~

13 SP 1105.03.9

m. NOTE: These are identified as RC type 4 on Bechtel Drawing E17B. Also the valve will go to the

" Function" position listed on E17B when it is deenergized.

10.1.2 The Shift Supervisor has given permission to deenergize the valve and has issued one SFAS door key.

10.2 Procedure 10.2.1 Obtain a copy of Drawing E17B " Safety Features Actuated Equipment".

10.2.2 Find the valve on E17B and the associated fuses in the fuse column.

NOTE: There are two fuses per valve in the same cabinet except for the main steam isola-tion valves which have two sets of two in two separate cabinets.

10.2.3 Remove the fuses and tag the fuse location and the CTRM switch (s). Return the key to the Shift Supervisor.

10.2.4 When the work is complete replace the fuses and clear the tags in the same sanner as above.

Section 10 completed on valve Date out of service by Date Returned to service by i

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