ML20086T281
| ML20086T281 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 09/16/1991 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML18057B451 | List: |
| References | |
| FC-888, NUDOCS 9201060202 | |
| Download: ML20086T281 (13) | |
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@.p Proc No 9.03 PALISADES NUCLEAR PLANT FUNCTIONAL DESCRIPTION Revision 9
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Palisades Nuclear Plant FC 888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 2 of 13 Plant System Code RPS This functional Description covers the replacement of all four channels of the Reactor Protection System (RPS) Power Supply Assemblies, Trip Unit Assemblies, Interconnection Modules, Bistable Trip Units and Auxiliary Trip Units.
This description also covers the incorporation of Trip Tester functions into the Power Supply Assemblies.
This RPS modification is required to address obsolescence concerns. The upgrade will improve RPS performance while reducing testing time and maintenance costs.
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,omer Figure 1 RPS UPGRADE BLOCK DIAGRAM
- Figure l=shows the RPS Upgrade Block-Diagram. -All items provided for this-upgrade will be form-fit-function replacements of installed equipment with the exception of the Power Supply Assembly front panel.
This panel will combine the functions that were previously contained in the Trip Tester Unit with the indications currently found on the Power Supply Assembly front panel.
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Palisades Nuclear Plant FC-888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 3 of 13 Plant System Code RPS combination will eliminate the need for the Trip Tester Unit. All equipment will be installed in-tha samo location as the item being rep 1. aced.
As shown in Figure 1, there will be four (4) complete sets of equipment as described below, one for each channel of the RPS.
Each P/5 assembly will supply a 12 VDC Test voltage, 115 VDC power for Trip Unit operation and 28 VDC Matrix Power.
I_nputs to the P/S Assembly will be the signal input to the Trip Unit, and the-trip and pre-trip point voltages.
Figure 2 shows the RPS P/S Assembly Block Diagram for Channel A.
This figure corresponds'.to the RPS P/S Channel A block shown -in Figure 1.
Five discrete power supplies, two-(2) +300V VDC Bulk and three (3) 28 VDC Matrix, are powered off a common AC bus.
The' output of each of the 28 VDC Matrix Power Supplies is diode auctioneered to specific logic matrix loads as shown. The Bulk 300 VDC_ power supplies are diode auc+1oneered and supply twelve-(12) 115 VDC converter / isolators that power each 'ndividual Trip Unit. A 12 VDC Tett Voltage converter / isolator is also powered off of the +300V oulk volt supply.
This supplies isolated power to the test functions i>.1 each Power Supply
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The test functions that were previously on the Trip Unit are impleme?.ted in a manner similar to thct used earlier. Changes made to the former design include the rewiring of, and the addition of four-(4) decks to the Trip Unit
-Select Switch; rewiring' the TMLP Select Switch, removing unnecessary resistors.
and potentioreters, and adding three (3) decks and three (3) positions to the DVM Input Select Switch. The test signals are brought into the Power Supply Assembly from the Interconnection Module by MS type connectors.
The Setpoint Trip and Setpoint Pre-trip decks on the Trip Unit Select Switch are rewired to direct the signals from each of the twelve pussible Trip Units to the to the DVM Input Select Switch. The location of the Trip Test Switch Connection to the Setpoint Trip deck is changed to the center pole This is required in order to maintain proper function after the switch deck is
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t Palisades Nuclear Plant FC-888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 5 of 13 Plant System Code RPS rewired. The change in location has no affect on the circuit operation.
Two (2) of the decks added to the Trip Unit Select Switch are used to replace the 6edicated signal and floating ground lines in the Trip Unit connection-cable. Additionally, one (1) deck is added for each polarity'of the 15 Volts used to power the Trip Units.
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- The twol(2) decks!on the Trip Unit Select switch that provide the proper polarity and-attenuation of. test voltage are rewired to provide palarity selection on one oeck and power routing on the other deck.
This results in the' use of only one set.of potentiometers and simplifies the circuit. =The TMLP Switch-is rewired.to support the power po'larity selection on one deck and 1
- the outpst:un-the other.
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s Palisades Nuclear.P1 ant FC-888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 7 of 13 Plant System Code RPS The three (3) decks added to the DVM Input Select Switch allow the test functions to be completely disconnected from both the DVM Jacks and the Bulk 300 VDC power. The first of the added positions is an 0FF position.
This is-an-open contact which performs the' disconnect function described-above.
The other; two added positions allow the measurement of the 115 Volt-Power supplied to each Trip Unit.
Figure 3 shows the implementation of the test functions.
Figure 4 shows the component blocks required to implement the 28V Matrix Power i
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- Supplies'and the Converter / Isolators shown in Figure 2.
Each block in Figure 4 has a. corresponding block in Figure 2 except for the +300V Volt Bulk Power Supplies. ;The +300V Volt Bulk Power Supplies are chassis mounted supplies.
Larger components are requireo for the +300V Bulk Power Supply due to the high-power requirements.
Using thc-se larger components.means implementing the
+300V. Volt Bulk Power Supplys with off the shelf components.
The diode auctioneering'is performed with chassis mounted aucticaeering diodes.
- Indication that both each of the +300V Bulk Power Supplies is operating properly is provided by a front panel LED. This LED is connected to the +300V Bulk Power Supply upstream of the auctioneering diode.
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FC-888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 8 of 13 Plant System Code RPS 3
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28V ilATRIX POWER-SUPPLY 115 V CONVERTERS The -lower: power requirements of the 28-Volt Matrix Power Supplies allows tha
- entire conversion process to be done on one card.
Figure 5 shows the card layout. -The-diode auctioneering is performed on the PC Card.
LED indication.
is provided to show proper operation of the power supplies in the same manner as the +300V Bulk Power Supplies.
Figure 6 shows the il5V Converter Card layout. The card converts the +300V-Bulk power:to the required 115 VDC, isolated power required by the Trip. Units.
- The trim pots required for the iS% trim are onboard the PC Card.
The converter modules are protected by ' fuses mounted on the PC Card.
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. The +12V test power.is supplied by a single converter / isolator card. This card, shown in Figure 7, provides power to the test function potentiometers found on the front panel of the RPS Power Supply Assembly.
Onboard trim and protection are provided for in the same manner as the 115V converter cards.
-Palisades Nuclear' Plant FC-888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 9 of 13 Plant System Code RPS
. i The RPS Power Supply-Assembly Front Panel is shown in Figure 8.
The panel
. incorporates the Matrix Power Supply indication found on the present system with the Trip Tester Unit functions, j
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. Indications found on the front panel are
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LEDs for each of the _three (3) 28V Matrix 3
-an Power Supplies, both of the 300V Bulk
~ Power Supplies and the 12V Test Power. A dual banana jack is provided for DVM
- connection to the test functions.
Controls.on the front panel are the Trip do;x
'd hir Unit Select. Switch,: Meter Output Select Figure 7 Switch, TMLP Switch, TiipLTest_ Switch, 12V TEST-POWER and Course.and Fine Potentiometers.
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FUNCTIONAL DESCRIPTION Facility Change Page 10 of 13 Plant System Code RPS
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Figure 8 POWER SUPPLY FRONT PANEL. LAYOUT The Trip Unit Select Switch has two functions.
The first is to connect the signals to.be measured ir. the selected Trip Unit'to the Meter Output Select i
Switch. The second is '.o supply the power polarity voltage to the selected Trip Unit ti. rough the Course and Fine potentiometers. The Trip Units which correspond to.the Trip Unit Select Switch positions are listed in Figure 1.
--The Meter Output Select switch. connects the signals from the Trip Unit Select Switch to the DtM Jacks-on the front panel.- Figure I lists the switch
- ~ positions and. corresponding signals.
am The TMLP Switch and Trip Test switch are functionally unchanged.
The wiring of the TMLP Switch was changed to accommodate the rewire of. the Trip Unit Select Switch..This change allows the use of'only one set of Potentiometers for upscale or downscale trip testing.
- < A power switch located on the top of the power supply drawer will remove all AC power to the PC Cards.
e Palisades Nuclear Plant FC-888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 11 of 13 Plant System Code RPS
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This is done because of the high voltage and large current capacities on some of the card connectors.
The power switch allows cards to be changed with the voltage removed from the cards.
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Figure 9 RPS POWER SUPPLY ASSEMBLY LAYOUT i
The general layout of the RPS Power Supply Assembly is shown in Figure 9.
The Assembly is divided into three parts.
The rear of the Assembly holds the 28V Matrix Power Supply cards, the +300V Bulk Power Supplies and the 12V Test l
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Palisades Nuclear Plant FC-888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 12 of 13 Plant System Code RPS Power Supply card.
The middle area of the Assembly holds the il5V converter / isolators.
Each card type has a specific pin configuration to ensure that each type will operate only in it's respected location.
The front area provides space behind the front panel for the individual components required for the test and indication functions.
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CARD CONNECTOR INTERCONNECTION DIAGRAM 1
A simplified diagram of the interconnection of these card connectors is shown in Figure 10.
The top row shows the connections for the 300 and 28 volt power supplies and the 12 volt test converter / isolator.
The bottom row shows the 115V converter / isolators. The power switch controls AC power to each of the power supplies. The external LED indication is also shown. A simplified picture of the 2 decks of the DVM Input Select Switch is shown connecting the
e Palisades Nuclear Plant FC-888 Rev.00 FUNCTIONAL DESCRIPTION Facility Change Page 13 of 13 i
Plant System Code RPS 300V bus to the 12V Test Power. MS type connecters are used to connect the il5V and the 28V Matrix Power to the Interconnection Module.
The interconnection modules function remains unenanged. The design remains the same as the original with the exception of the number and location of the connectors.
The added connectors are required to implement the test functions i
in the PRS Power Supply Assembly.
Connections are made within existng connectors where possible.
The only changes made in the Bistable a:: Auxiliary Trip Units are to remove obsolete components and to remove the test jack and associated components from the front panel. A new circuit design results from using updated components in the Trip Units.
Some pin connections on the Trip Units are changed. These changes _are accomodated in the redesign of the interconnection module. These physical changes to the trip units do not change the fcaction of the Trip Units.
The RPS is a QListed system. All components not currently in the EDB must b3 added.
The EEQ is unaffected.
There are no harsh environmental factors to be cerisidered since the equipment to be installed is entirely within the control room.
Upon the request of the Palisades engineering personnel, the RPS Flow Trip Setpoint Selector (FTSS) switch shall be removed as part of the upgrade. This l
modification has limited impact upon the upgraded auxiliary and bistable trip
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unit assembly design.
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