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@.p Proc No 9.03PALISADES NUCLEAR PLANT Attachment 3.FUNCTIONAL DESCRIPTION Revision 9

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Palisades Nuclear Plant FC 888 Rev.00FUNCTIONAL 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. Thisdescription also covers the incorporation of Trip Tester functions into the

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Power Supply Assemblies. This RPS modification is required to address.

obsolescence concerns. The upgrade will improve RPS performance whilereducing testing time and maintenance costs.

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Figure 1RPS 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 theexception of the Power Supply Assembly front panel. This panel will combinethe functions that were previously contained in the Trip Tester Unit with theindications currently found on the Power Supply Assembly front panel. This

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Palisades Nuclear Plant FC-888 Rev.00'

FUNCTIONAL DESCRIPTIONFacility Change Page 3 of 13

Plant System Code RPS

combination will eliminate the need for the Trip Tester Unit. All equipmentwill 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 asdescribed below, one for each channel of the RPS. Each P/5 assembly willsupply a 12 VDC Test voltage, 115 VDC power for Trip Unit operation and 28 VDCMatrix Power. I_nputs to the P/S Assembly will be the signal input to the TripUnit, and the-trip and pre-trip point voltages.

,

Figure 2 shows the RPS P/S Assembly Block Diagram for Channel A. This figurecorresponds'.to the RPS P/S Channel A block shown -in Figure 1. Five discretepower supplies, two-(2) +300V VDC Bulk and three (3) 28 VDC Matrix, arepowered off a common AC bus. The' output of each of the 28 VDC Matrix PowerSupplies is diode auctioneered to specific logic matrix loads as shown. TheBulk 300 VDC_ power supplies are diode auc+1oneered and supply twelve-(12) 115VDC converter / isolators that power each 'ndividual Trip Unit. A 12 VDC TettVoltage converter / isolator is also powered off of the +300V oulk volt supply.This supplies isolated power to the test functions i>.1 each Power SupplyAssembly,

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The test functions that were previously on the Trip Unit are impleme?.ted in amanner similar to thct used earlier. Changes made to the former designinclude 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 theDVM Input Select Switch. The test signals are brought into the Power SupplyAssembly from the Interconnection Module by MS type connectors.

The Setpoint Trip and Setpoint Pre-trip decks on the Trip Unit Select Switchare rewired to direct the signals from each of the twelve pussible Trip Unitsto the to the DVM Input Select Switch. The location of the Trip Test SwitchConnection to the Setpoint Trip deck is changed to the center pole This isrequired in order to maintain proper function after the switch deck is

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Palisades Nuclear Plant FC-888 Rev.00FUNCTICHAL DESCRIPTION

Facility Change Page 4 of 13

Plant System Code RPS

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Figure 2CHANNEL A RPS ASSEMBLY BLOCK DIAGRAM l

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Palisades Nuclear Plant FC-888 Rev.00FUNCTIONAL 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 replacethe 6edicated signal and floating ground lines in the Trip Unit connection-cable. Additionally, one (1) deck is added for each polarity'of the 15 Voltsused to power the Trip Units.

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' FUNCTIONAL. DESCRIPTION-Facility Change Page 6 of 13

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Plant System Code RPS

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:The two|(2) decks!on the Trip Unit Select switch that provide the properpolarity and-attenuation of. test voltage are rewired to provide palarityselection on one oeck and power routing on the other deck. This results inthe' use of only one set.of potentiometers and simplifies the circuit. =The

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TMLP Switch-is rewired.to support the power po'larity selection on one deck and1

- the outpst:un- the other.

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Palisades Nuclear.P1 ant FC-888 Rev.00'

FUNCTIONAL DESCRIPTIONFacility Change Page 7 of 13

Plant System Code RPS.

The three (3) decks added to the DVM Input Select Switch allow the testfunctions 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 suppliedto 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 *

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Figure 4P/S PC CARD BLOCK DIAGRAM -

- Supplies'and the Converter / Isolators shown in Figure 2. Each block in Figure4 has a. corresponding block in Figure 2 except for the +300V Volt Bulk PowerSupplies. ;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 diodeauctioneering'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 +300VBulk Power Supply upstream of the auctioneering diode.,

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Palisades' Nuclear Plant ~- FC-888 Rev.00.

FUNCTIONAL DESCRIPTIONFacility Change Page 8 of 13

Plant System Code RPS -

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j .- Figure 5 Figure 6L 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 cardlayout. -The-diode auctioneering is performed on the PC Card. LED indication.is provided to show proper operation of the power supplies in the same manneras 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..

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- 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. Thiscard, shown in Figure 7, provides power to the test function potentiometersfound on the front panel of the RPS Power Supply Assembly. Onboard trim andprotection are provided for in the same manner as the 115V converter cards.

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-Palisades Nuclear' Plant FC-888 Rev.00FUNCTIONAL 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 Supplyindication found on the present systemwith the Trip Tester Unit functions,

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. Indications found on the front panel are_ , , ,

-**4" " , ~ ,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

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dual banana jack is provided for DVM

- connection to the test functions.Controls.on the front panel are the Trip do;x 'd hirUnit Select. Switch,: Meter Output Select Figure 7Switch, TMLP Switch, TiipLTest_ Switch, 12V TEST-POWER

and Course.and Fine Potentiometers.

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Palisades Nuclear Plant FC-888 Rev.00+FUNCTIONAL DESCRIPTION

Facility Change Page 10 of 13

Plant System Code RPS

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Figure 8POWER SUPPLY FRONT PANEL. LAYOUT

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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'

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Switch. The second is '.o supply the power polarity voltage to the selectedTrip Unit ti. rough the Course and Fine potentiometers. The Trip Units whichcorrespond to .the Trip Unit Select Switch positions are listed in Figure 1.

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--The Meter Output Select switch. connects the signals from the Trip Unit SelectSwitch 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 wiringof 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 Potentiometersfor upscale or downscale trip testing.

:< A power switch located on the top of the power supply drawer will remove allAC power to the PC Cards. '

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Palisades Nuclear Plant FC-888 Rev.00FUNCTIONAL 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 9RPS 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|

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Palisades Nuclear Plant FC-888 Rev.00FUNCTIONAL DESCRIPTION.,

Facility Change Page 12 of 13

Plant System Code RPS

Power Supply card. The middle area of the Assembly holds the il5Vconverter / isolators. Each card type has a specific pin configuration toensure that each type will operate only in it's respected location. The frontarea provides space behind the front panel for the individual componentsrequired for the test and indication functions.

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Figure 10i . CARD CONNECTOR INTERCONNECTION DIAGRAM1

A simplified diagram of the interconnection of these card connectors is shownin Figure 10. The top row shows the connections for the 300 and 28 volt powersupplies and the 12 volt test converter / isolator. The bottom row shows the

,115V converter / isolators. The power switch controls AC power to each of thepower supplies. The external LED indication is also shown. A simplifiedpicture of the 2 decks of the DVM Input Select Switch is shown connecting the

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Palisades Nuclear Plant FC-888 Rev.00FUNCTIONAL 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 remainsthe same as the original with the exception of the number and location of theconnectors. The added connectors are required to implement the test functions i

in the PRS Power Supply Assembly. Connections are made within existngconnectors where possible.

The only changes made in the Bistable a:: Auxiliary Trip Units are to removeobsolete components and to remove the test jack and associated components fromthe front panel. A new circuit design results from using updated componentsin the Trip Units. Some pin connections on the Trip Units are changed. Thesechanges _are accomodated in the redesign of the interconnection module. These

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physical changes to the trip units do not change the fcaction of the TripUnits.

The RPS is a QListed system. All components not currently in the EDB must b3added.

.

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 TripSetpoint Selector (FTSS) switch shall be removed as part of the upgrade. This

| modification has limited impact upon the upgraded auxiliary and bistable trip(- unit assembly design.i

_