ML20064G539

Rev 0 to Div I Mod Design Description MDD-OC-622-C Div I, Replacement of Recirculation Flow Monitoring Electronics.

ML20064G539
Person / Time
Site:	Oyster Creek
Issue date:	01/14/1994
From:	Hoolahan D GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20064G524	List: ML20064G522 ML20064G539
References
MDD-OC-622-C-DI, NUDOCS 9403160222
Download: ML20064G539 (16)

Text

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DIVISION I MODIFICATION DESIGN DESCRIPTION-FOR EEPLACEMENT OF RECIRCULATION FLOW MONITORING ELECTRONICS (NUCLEAR SAFETY RELATED)

OYSTER CREEK GENERATING STATION 4

PREPARATION D. Hoolah DATE /!//if '

CONCURRENCE a ' NY DATE I

li k 3 N <

Q! LC d- I APPROVAL DATE Ty I

9403160222 940309 DR ADDCK 0500 9 m 7a

. ,e MDD OC-622-C DN I Rev,O Pagei e L)] Nuclear ooCuMeur no.

MDD-OC622-C Div. I i TITLE REPLACEMENT OF RECIRCULATION FLOW MONITORING ELECTRONICS

. REV

SUMMARY

OF CHANGE APPROVAL DATE i-0 Initial Release l

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N0036 (03-90) 005/028 January 1994

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l MDD-OC-622-0 DIV I g Rev. 0

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TABLE OF CONTENTS l l

1.0 PURPOSE AND SCOPE . . . . . . . . . . . . . . . . . . . . . . . . 1 ,

2.0 REFERENCES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 i 3.0 FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 l l

4.0 l DESIGN REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . 4 4.1 Licensing and Regulatory Requirements . . . . . . . . . . . 4 l 4.2 Process and Operational Requirements . . . . . . . . . . . 4 1 4.3 Configuration and Essent'al Features . . . . . . . . . . . 4 )

4.4 Interfacing Systems . . . . . . . . . . . . . . . . . . . . 5 4.5 Structural Requirements . . . . . . . . . . . . . . . . . . 6 4.6 Mechanical Requirements . . . . . . . . . . . . . . . . . . 6 1 4.7 Electrical Requirements . . . . . . . . . . . . . . . . . . 6 4.8 Instrumentation and Control . . . . . . . . . . . . . . . . 7 4.9 Environmental Conditions . . . . . . . . . . . . . . . . . 7 4.10 Thermal Requirements . . . . . . . . . . . . . . . . . . . 8 )

4.11 Materials . . . . . . . . . . . . . . . . . . . . . . . . . 8 1 4.12 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 8 l 4.13 Surveillance and In-Service Inspection . . . . . . . . . . B l 4.14 Testing Requirements . . . . . . . . . . . . . . . . . . . 8 l 4.15 Human Factors . . . . . . . . . . . . . . . . . . . . . . . 9 4.16 Safety, Health, and Security Requirements . . . . . . . . . 9 4.17 Quality Classification / Assurance . . . . . . . . . . . . . 9 l

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MDD-OC-632-C D2V I

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, Rev. 0 Page 1 of 13 1.0 PURPOSE AND SCOPE The existing recirculation (recire) flow monitoring electronics have had a history of problems mainly due to the age of the equipment. These problems include poor drif t characteristics, dif ficulty in calibrati7g the system, and a lack of available spare parts. The drift problem with the electronics prevents them from being able to support a 24 month fuel cycle. System calibration must be performed with the plant shut down.

The procedure can last for several days.

Inis modification replaces the existing recire flow monitoring electronics with state-of-the-art hardware. This replacement includes the 10 flow transmitters (2 for each of the 5 recirc loops) and electronics on control room panels 3R and SR. Control room equipment being replaced by this modification includes the transmitter power supplies (2), square root converters (10), summers (4), and the Average Power Range Monitor (APRM) flow units (2 flow converters, 2 power supplies).

2.0 REf7ERENCES Unless otherwise specified, revisions of documents invoked below are the latest as defined by CARIRS at the time of the baseline engineering release.

2.1 1000-PLN-7200.01, "GPUNC Operational Quality Assurance Plan for Three Mile Island Unit 1 and Oyster Creek" 2.2 SP-9000-44-001, " Specification for Instrument and Control Equipment Mounting and Tubing Installation" 2.3 GPCN Engineering Standard ES-008, " Human Engineering Guide - Oyster Creek" 2.4 GPUN Engineering Standard ES-027, " Environmental Parameters -

Oyster Creek NGS" 2.5 SQUG Generic Implementation Procedure (GIP) for Seismic Verification of Nuclear Plant Equipment 2.6 Oyster Creek Updated Final Safety Analysis Report Sections Tables "i. 2.1.1.1 Table 7.2-1 Table 7.2-2 7.5.1.8.7 Table 7.5-2 7.6.1.1.4 Table 7.6-4 2.7 Oyster Creek Technical Specifications:

Sections 7_a_b_1gy 2.3 A/B/O Table 4.1.1 2.3 Bases ,

2.8 SP-9000-41-005, " Installation Specification for Cables and Raceways at Oyster Creek Nuclea: Generation Station" 2.9 GPUN Engineering Procedure EP-Oll, " Methodology for Preparing the Quality Classification List" 005/028 -

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MDD-CC-G22-C DIV I

.a Rev. 0 Page 2 of 13 2.10 GPUN Document 990-1468, "Dyster Creek Electrical Equipment Environmental Qualification Master List" 2.11 Regulatory Guide 1.29, " Seismic Design Classification", 1978 2.12 Regulatory Guide 1.100, " Seismic Qualification of Electric and ,

Mechanical Equipment for Nuclear Power Plants", 1988 2.13 IEEE 344, " Recommended Practices for Seismic Qualification of Class 1E Equipment for Nuclear Power Generating Stations", 1987 2.14 SDBD-OC-641, Rev. 1, " System Design Basis Document for the Reactor  ;

Protection System" 3.0 FUNCTIONS The recire flow monitoring system provides inputs to the Reactor Protection System (RPS) as discussed in the RPS System Design Basis Document (SDBD Ref. 2.14). The functions of the existing system are described below and are shown in block diagram rm in Figure 1.

3.1 The recire flow electronics consists of two independent divisions.

Each division monitors the differential pressure (dP) in the five ,

reactor recirculation loop venturis and converts the dP signals into flow signals by a square root function. Individual flow signals from divisior. I are provided to the plant computer.

Individual flow signals from division 2 are provided to indicators on tha control room panel 3F.

3.2 The electronics in each division sum the individual flow signals to produce a total recire flow signal from each division. The total flow signal from division 1 is provided to the following locations:

a) Flow recorder on panel 3F l b) The division 2 flow converter (for comparator function) I c) APRM 1,2,3, & " trip bias units I d) Meter on divit- 1 flow converter power supply module The total flow signu . rom division 2 is provided to the following locations:

a) Total flow indicator on panel 4F b) The division 1 flow converter (for comparator function) i c)

APRM 5,6,7, & 8 trip bias units d) Meter on division 2 flow converter power supply module 3.3 The electronics in each division provide the following trip  !

functions: )

a) Uoscale Trio - This half scram function is designed to initiate l on high flow. This trip also results in a rod block, illumination of the UPSCALE and INOP lights on the flow l converter module, and the APRM FLO BIAS OFF NORMAL annunciator alarm on Panel G-5-f. The following conditions initiate an Upscale Trips Total .w 2114% 1% rated (177,600 GPM)

Mode switch not in OPERATE position 005/028 December 23, 1993

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MDD-OC-622-C DIV I

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, Page 3 of 13 Loss of. power (trip is initiated but status lighte do not  ;

illuminate due to power loss) b) Comparator Trio - This rod block function is designed to detect I a mismatch between divisions. This trip also results in the illumination of the COMP and INOP lights on the flow converter module, and the APRM FLO BIAS OFF NORMAL annunciator alarm on ,

Panel G-5-f. The following conditions initiate a Comparator Trips Flow mismatch between divisions 210% 1% rated (16,000 GPM) ,

Loss of power (trip is initiated but status lights do not illuminate due to power loss)

The Upscale and Comparator Tripe reset automatically when flow conditions return to normal. The status of the trips indicated at ,

the flow converter module must be manually reset. The above trip functions can be tested using internal calibration signals.

3.4 The new system configuration performs the above functions with some exceptions and enhancements. These include the following:

EXEgptions a) External test signals are required to test the trip functions.

b) The indicator built in to the flow converter power supply is not incorporated into the new system.

c) The Mode switch on the flow converter, and the meter switch on the flow converter power supply are not needed in the new system configuration.

Enhancements (See figures 2.1 and 2.2 for details) a) " Smart" transmitters are used which incorporate the square root function. This reduces the number of modules required in the control room. The smart feature also allows simplified calibration of the control room electronics.

b) Test blocks are added to the Foxboro electronics where needed to facilitate surveillance and calibration using external test .

signals. These test blocks are shown on figures 2.1 and 2.2.

c) The total flow signal between divisions (used for comparator function) is provided through isolators to ensure separation between RPS divisions. ,

d) Trio Functions Unscale Trio The Upscale trip remains unchanged except for the trip status indication. The Inop light does not illuminate due to an Upscale trip.

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• Comparator Trio l The Comparator trip remains unchanged except for the trip i status indication. The Inop light does not illuminate due to a Comparator trip.

• Inon Trio Each division of the Foxboro electronics consists of two nests. Each nest contains an individual nest power supply.

A power supply failure in the lower nest results in a fail safe Upscale and Comparator trip when tne relays de- ,

energize. The trip status lights do not illuminate due to the power loss. This is essentially unchanged from the existing system configuration.

A total flow voltage signal (2,5-12.5 V) from the upper nest is monitored by an alarm module in the lower nest. If this signal f alls below the 2.5V zero flow level (setpoint to be determined by calculation), an Inop trip is initiated. This would be an indication of a power supply or module failure. The logic for this trip function is shown in figure 3. The Inop trip results in the same actions as the existing Upscale trip with the exception of the trip status indication. If power is not lost, the Inop light is the only indicator that illuminates due to an Inop trip.

4.0 DESIGN REQUIREMENTS 4.1 Licensing and Regulatory Requirements The design and in* 'lation of the flow transmitters and control room electronics enly with IEEE 344 (Ref. 2.13) . IEEE 323 does not apply dification since all components are located within a : sont and are not contained within the l EQ Master List (Re ej Guides 1.29 and 1.100 (Refs. 2.11 l

& 2.12) apply to flow portion of the Reactor Plant Instrumentation sysu.s  ; being impacted by this modification.

4.2 Process and Operational Requirements The design of the modification must not reduco the capability of the recire flow monitoring system to be able to perform its function as defined in the Oyster Creek Technical Specifications (Ref. 2.7) and t3e Updated Final Safety Analysis Report I (UFSAR)(Ref. 2.6).

4.3 Configuration and Essential Features The design of this modification shall be in accordance with the requirements of SP-9000-44-001 (Ref. 2.2) .or the installation of i the new flow transmitters at RK-04. The control room electronics  ;

are installed in the standard 19" racks in control room panels 3R {

and SR. Existing field wiring is reused as much as practical. New j wiring and flexible conduit at the transmitters, and new wiring in the control room panels shall be in accordance with SP-9000-41-005 i (Ref. 2.8). Existing separation will be maintained or enhanced.

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4.4 Interfacing systems i 4.4.1 Main Control Room Panels (611)

The new electronics are mounted in the control room panels ,

3R and SR where the old equipment was located. Additional '

vacant space below is also utilized.

4.4.2 Local Control / Instrument Racks (614)

The new flow transmitters are mounted in place of the old transmitters at RK-04 in the reactor building north west corner room, elevation (-)l*-11".

4.4.3 Plant Annunciator System (616) l Outputs from the recire flow monitoring electronics produce l the APRM FLO BIAS OFF NORMAL annunciator alarm on Panel G- l 5-f as discussed in section 3.3. The Inop trip is a new initiating condition for this alarm along with the existing i Upscale and comparator Trip.

4.4.4 Core Monitorina Svetem (621)

The recire flow monitoring system provides total flow voltage signals to the Average Power Range Monitor (APRM) eystem. The APRM trip bias units use this signal to determine the flow biased rod block and scram setpoints.

4.4.5 Reactor Plant Instrumentation f622)

The equipment replaced by this m3dification monitors the flow through the reactor recirculation loops. Division 1 of the recire flow monitoring electronics provides a total flow signal to a recorder on panel 3F. Division 2 provides indivii al loop flow signals to indicators on panel 3F, and t

a tott.. flow signal to an indicator on panel 4F.

-l 4.4.6 Reactor Manual Control Svetem (620) 1 Outputs from the recirc flow monitoring system provide a control rod withdrawal block in the reactor manual control system as discussed in section 3.3. This rod - block function is provided based on a comparison between the division 1 and division 2 total flow signals. The total flow signal from each division to the other is provided through class 1E isolators to ensure division sepatation.

4.4.7 Reactor Protection System (641)

Outputs from the recirc flow monitoring system provide a reactor scram in the reactor protection system as discussed  ;

in section 3.3.

I 4.4.8 Plant Computer System (651) I The existing recire flow monitoring system provides individual loop flow signals from division 1 to the plant l computer. This interface remains unchanged with the new l system configuration. l 005/028 December 23, 1993  !

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... Rev. 0 Page 6 of 13 4.4.9 120V AC Vital Power System (733)

Division 1 of the recire flow monitoring system is powered from 120V AC protection system panel 1 (PSP 1, Ckt. 7).

Division 2 is powered from PSP 2 (Ckt. 9). This modification does not change the source of power to the divisions.

4.4.10 Cable, Raceway. and Conduit Systems (770)

The cables connecting the flow transmitters to the control room electronics travel through this system. Existing cables between the terminal boxes at RK-04 ac.d the control room are reused. New wires are used to . connect the transmitters to these local terminal boxes. New flex conduit is used between the transmitters and the panel.

This modification has no impact on the cable, raceway, and conduit system.

4.5 Structural Requirements This modification replaces existing flow transmitters and control room electronics. Seismic class 1 integrity of equipment and supports must be maintained. Supports for and/or mounting of components for this modification shall be seismically qualified using SQUG methodology (Ref. 2.5).

4.6 Mechanical Requirements The replacement of the recire flow transmitters requires replacement of tubing connecting the existing valve manifolds to the flow transmitters. The transmitter and tubing installation shall be in accordance with SP-9000-44-001 (Ref. 2.2).

4.7 Electrical Requirements To the extent possible, existing field cable shall be reused for the electrical installation of the control room electronics. The af fected cont rol room wiring will be removed back to the vertical terminal strips located behind the panels. Some existing field wiring is terminated directly to plug type connectors. These wires will be cut and landed on existing spare terminals on the vertical terminal strips. Any necessary splicing shall be performed in accordance with SP-9000-41-005 (Ref. 2.8).

Two existing field cables (single conductor shielded)- routed between divisions are be:ng replaced by two new cables (twisted shielded pair). This new field wiring shall be in accordance with the requirements of SP-9000-41-005 (Ref. 2.8).

Wiring between the transmitters and the local terminal boxes at RK-04 is being replaced with new wiring. This wiring shall be in accordance with the requirements of SP-9000-41-005 (Ref. 2.8).

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MDD-OC-623-C DIV I

., , Rev. O Page 7 of 13 4.8 Instrumentation and Control The replacement electronics perform the same basic functions as the existing system. Enhancements provide simplified calibration and troubleshooting using the dP transmitter smart feature. The configuration of the electronics is shown in Figure 2.1 and 2.2 and is described below.

a) Differential pressure signals are square rooted at the flow transmitters to cor<ert the dP signals to individual loop flow signals.

b) These individual loop flow signals are sent to the control room ,

to be processed by the new electronics. From there the individual loop flow signals are sent to indicators on panel 3F (division 2) and to isolators for the plant computer (division 1),

c) The individual loop flow signals are summed in each division to produce total recire flow signals. The total flow signal from division 1 is sent to a recorder on panel 3F. The total flow signal from division 2 is sent to an indicator on panel 4F.

The total recirc flow signals from both divisions is sent to Foxboro alarm modules, to 4 APRM trip bias units, and to the other system vta class 1E Foxboro isolators.

d) The Foxboro alarm modules provide the high flow scram, inop scram, and the flow mismatch rod block functions discussed in e), f), and g) below.

e) Excess total recirculation flow results in an upscale trip (scram) in a 2 out of 2 logic configuration.

f)- Loss of 120V AC power, failure of either nest power supply, or a downscale total flow voltage signal (<2.5V) results in an inop trip (scram) in a 2 out of 2 logic configuration, g) Total flow mismatch between divisions results in a comparator trip (rod withdrawal block) in a 1 out of 2 logic configuration.

h) The conditions in e), f), and g) result in the APRM FLO BIAS OFF NORMAL annunciator alarm on panel G-5-f.

The Oyster Creek technical specifications (Ref. 2.7) require calibration by application of a test pressure once per 20 months.

However, the new system is capable of supporting a 24 month fuel cycle.

t 4.9 Environmental Conditions The environmental parameters for Oyster Creek are discussed in engineering standard ES-027 (Ref. 2.4).

The location of the new flow transmitters places them in EQ zone 37 (RB NW corner room, El. (-)1'-11", RK-04). This area is considered a mild environment during normal operation. The recire flow transmitters are not required to function during conditions that produce a harsh environment in this area. The replacement tranJ-mitters do not impact the existing provisions at this location.

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.y t-HDD-OC-622-C DIV I Rev. 0

. Page 8 of 13 The Rosemount transmitters are capable of operation under the mild environmental conditions which are discussed below.

The new electronics are located in the control room which is a mild environment (EQ zone V). The Foxboro electronics are capable of operation under these environmental conditions which are discussed below.

Oveter Creek Environmental Conditions 123rameter RB NW Corner Room Control Room Aging Temperature 85'F 80*F Pressure: 14.7 paia 14.7 psia Humidity: 100% RH 100% RH.

Radiological: 7.9xlO' Rad Negligible 6 10 Thereal Requirements The new control room electronics have loss than 200 watts of thermal output per division. This has a negligible impact on the control room HVAC. Otherwise, there are no other impacts on thermal requirements.

4.11 Haterials Material requirements are compatible and consistent with existing equipment and with plant requirements.

4.12 Maintenance The new transmitters are installed on RK-04. No change to access or space requirements will be made or are necessary at this location.

The control room electronics are installed in panels 3R and SR.

Access to this equipment requires removal of a transparent cover plate that serves to protect the squipment. Routine preventative maintenance will be done in accordance with site I&C maintenance procedures prepared based on manufacturere recommendations.

4.13 Surveillance and In-service Inspection The existing electronics are calibrated once per 20 months per the Oyster Creek technical specifications (Ref. 2.7). A quarterly surveillance is also performed to test the trip points.

The new equipment will be calibrated in accordance with the requirements of the oyster Creek Technical Specifications.

4.14 Testing Requirements The new recirc flow monitoring system will have site acceptance testing to verify operability. This will include simulation'of inputs and verification of outputs. .

005/028 December 23, 1993

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KDD-CC-622-c DIV I

-. Rev. O Page 9 of 13 The testing will include the followings a) Verification of proper flow signals (individual loop and total flow) based on actual or sLmulated flow input signals b) Verification of proper flow indication (flow indicators, recorder, and plant computer) c) Verification of proper trip functions at the appropriate '

setpoints and upon loss of power or downscale (inop) d) Proper operation of the flow biased rod block and scram functions within the APRMs 4.15 Human Factors Panel layout and labeling subject to Human Factors review in accordance with ES-008 (Ref. 2.3) . No annuncistor points are being added or deleted; however, an inoperative trip function is being added to the initiating causes of this alarm. This new trip must be incorporated along with the upscale and comparator trip into the alarm response procedure.

4.16 Safety, Health, and Security Requirements These are not a consideration for this modification.

4.17 Quality classification / Assurance The recirc flow monitoring system is classified as Nuclear Safety Related (NSR) in EP-Oll (Ref. 2.9). The design of this modification must comply with the requirements of the GPUN Operational Quality Assurance Plan (Ref. 2.1). System and component classifications are unchanged by this modification.

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4. MODULE SLOT NUMBERS TRIP STATUS

• N-2Ai-T2V+ VE N-2AO-val O !!!;d:--M:

4). MISM ATCH SHOWN IN CIRCLES. @ .

AND RESET

!! '$5 5 .:. i I U

D: ... -- 7@:if.  : .

. S

' ::: : t' . -

2.5-12.5 V <

ISOLATED INPUT FROM 2.5-12.5 V ISOLATED OUTPUT TO wtas OTHER DIVISION. O OTHER DIVISION 57 4

s MDD-oc-622-C DIV I )

, rov. O I

/

Page 13 of 13 I l

FIGURE 3 RELAY LOGIC FOR UPSCALE, INOP AND COMPARATOR TRIP FUNCTIONS HIGH FLOW INOP MISMATCH SCRAM SCRAM ROD BLOCK COM ALM AR ALM-AR ALM-BR U PSCALE INOP MISMATCH

f  :: A $  :: D  ::

==

( _,

B LED LED LED C = e::=  ?">  ?~ ~

== r n>

RESET

{ RESET { RESET K1 K2 A C D K3 K4 B

+ 15 V "U PSCALE "INOP "COMPARATO R TRIP" TRIP" TRIP" INTERLOCK SCRAM 10K54 DIV 1 ROD 10K55 DIV 2 DIS PLAY ALARM BLOCK

/ N .

A FM F Af FA F Mf F Mf4 F Af4 F Mf4 F K1 K2 K3 K4 SEAL SEAL SEAL p

M4F MHF RHF MHF MHF A B C D E

1. RELAYS K1-K4 ARE PART OF N-2AO+ L2C R. DEENERGlZE TO TRIP.

2. RELAYS A-E ARE PART OF N-2AP-A+ RBF. A, D. & B ENERGlZE TO INDICATE TRIP.

3. RESET SWITCHES AND LEDS ARE MOUNTED ON BLANK MODULE IN LOWER NEST. I

4. FOXBORO ALARM MODULES SHOWN IN TRIPPED CONDITION.

005/028 December 23, 1993