ML20210V117
| ML20210V117 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/29/1997 |
| From: | Martin V, Reigel D TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20210V116 | List: |
| References | |
| A-2506-6, A00-02506-6, MIL-STD-462D-CS, MIL-STD-462D-CS114, NUDOCS 9709230062 | |
| Download: ML20210V117 (12) | |
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Browns Feny RBVRM DRF No. A00025M4 bOL-STD 462D, CS114 Quali6 cation Plan and Raport Oualification Plan and Renort MIL-STD 452D. CS114. Conducted Suscentibility. Bulk Cable Infection NUMAC Reactor Buildine Vents Radiation Monitor (RBVRM)
TVA Browns Ferry Units 1. 2 & 3 ,
July 29,1997 T
Prepared by : bLM D . W . R eigel '
Reviewedby: [.
V.E.Mamn hok $Dokk OS PDR Obb59 p
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. Browns Ferry RBVRM DRF No. A00-02506-6 ,
MIL STD 4620, CSI14 Qualificatior. Plan and Report
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Table of Contents
- 1. B AC KG ROU N D A N D SC OPE .......................... ................................................................ 3
- 2. REFERENCE 8..................................................................................................................3
- 3. Q U A LI F IC ATI O N PLA N ............................................................................................. .... ... 4
~3.1 Requirements - - 4 3.2 RBVRM System Architecture _4 3.3 Test Coefiguration and Justinestlos 6 3.3.I Test Con 5guration_._.__ -_ . -___.m.m._.. .6 3.3.2 Test Configurstion hstification ... . ............. ............ .. .... ..... ..... ..... ..~ . . . . . . . . . . _.7 3.4 Operstlos Durine Testleg --- - . - . to 3.5 Bases for hsslag QualiGentlos - I1
- 4. Q U A LI FIC ATION R E S ULTS ........... ................................................................................ 1 1
- 5. CONCLUSION................................................................................................................12 Page 2 of 12 caiiv ooc
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. Browns Ferry RBVRM DRF No. A00 035(6 4 MIL STD 462D, CSI 14 Qualifwation Plan and Report
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- 1. Background and Scopo ne TVA Reactor Building Wnts Radiation Monitor (RBVRM) system utilizes GE NUMAC equipment, with one system applicable to each of the Browns Ferry Units (1,2 & 3). De system in each Browns Ferry Unit comprises two RBVRM channels, each including one NUMAC RBVRM Chassis (GE Part No. 304A3718Gl), one RBVRM Interface Panel (GE Part No.188C8925GI), two signal Splitten (GE Part No. 239B7417GI), and four Digital Sensor & Converters (GE Part No.
188C8941GI-4). De RBVRM Chassis and the RBVRM Interface Panels are mounted in Pane 1910 of the respective Units, ne Splitters and the Digital Sensor & Converters am mounted locally, Two previous EMI qualification actions have been performed on the RBVRM. nose are documented in References 2.a and 2.b respectively nose qualification actions included qualification to various standards, but none specifically to MIL-STD-462D, CSil4. His plan and raport covers qualification testing of RBVRM equipment to demonstrate qualifmation to MIL STD-462D, CSil4.
The specific qualifwation levels are defined in Section 3.
i nis plan and rep:,et documents the qualification ac9ons intended to demonstrate qualification of the installed RBVRM systems at Browns Ferry Units 1,2 & 3 to MIL STD-462D. nose actions include selecting a representative RBVRM channel configuration, testing that configuration in accordance with the MIL STD-462D test requirements, and documenting results, conclusions, and bases for qualification of the installed systems.
2, References
- a. NEDC-31974P, GE Qualification Report for RBVRM, Nov.1991.
A00-02506-4, Vol. 3
- c. Similarity Analysis of TVA Browns Ferry RBVRM System for EMI Testing,9/10/93, GE DRF No. A00-02506-4, Vol.1, index. No. M.
- d. NUMAC RBVRM Schematic Diagram, Unit 1, GE Dws. No.105E1004, Rev. 6
- e. NUMAC RBVRM Schematic Diagram, Unit 2, GE Dws. No.105E1043, Rev. 3
- f. NUMAC RBVRM Schematk Diagram, Unit 3, GE Dws. No.105E1044, Rev. 2
- g. Panel 9-10 Mod Kit Drawing and Parts List, Unit 1, GE Dws. No.105E1027GI, Rev. 5
- h. Panel 9-10 Mod Kit Drawing and Parts List, Unit 2, GE Dwg. No.105E1041G1, Rev. 2
- i. Panel 9-10 Mod Kit Drawing and Parts List, Unit 3, GE Dws. No.105E1042GI, Rev. 2
- j. RBVRM Assembly Drawing and Parts List, GE Dwg. No. 304A3718GI, Rev.1/0 (PUAssembly)
- k. RBVRM Assembly Drawing and Parts List, GE Dwg. No. 945E443G1, Rev. 4/l (PUAssembly)
- 1. RBVRM Elementary Diagram, GE Dwg. No.105E1002, Rev. 3 Page 3 of 12 csm noe
- Browns Ferry RBVRM DRF No. A00-02506-6 MIL STD-462D, CSI14 Qualification Plan and Report
- m. RBVRM Interface Panel Assembly and Parts List, GE o.188C8925Gl Rev.5/l (PUAssembly)
- n. RBVRM Interface Panel Schematic Diagram, GE Dws. No.105C1003, Rev. 4
- o. RBVRM Splitter Assembly and Parts List, GE Dws. No. 239B7417GI, Rev. 3/0 (PUAssembly)
- p. Digital Sensor & Converter Assembly and Parts List, GE Dws. No.188C8941Gl 4, Rev.
3/2 (PUAssembly)
- r. RBVRM Sensors Modification Kit, Unit 1, GE Dws. No.188C8948GI-3, Rev.1/3 (PUAssembly)
- s. RBVRM Sensors Modification Kit, Unit 2, GE Dws. No.188C8949G1 3, Rev. 2/2 (PUAssembly)
- t. RBVRM Sensors Modification Kit, Unit 3 GE Dws. No.188C8950GI-3, Rev. 2/1 (PUAssembly)
- u. MIL STD-462D, Military Standard, Measurements of Electromagnetic Interference Characteristics, January 11,1993.
- v. MIL-STD-461D, Military Standard, Requirements for the Control of Electromagnetic Interference Emissions and Susceptibility, January 11,1993.
- w. Letter of Compliance, C&C laboratory, June 11,1997 (filed in DRF No. A00 0250(Hi)
- x. MIL STD-462D, CSil4 RBVRM Test Report (filed in DRF No. A00 02506-6)
- y. TVA Design Change Notice No. WIi179A
- z. Cable Harness Assembly Drawing and Parts List, GE Dwg. No.188C8942GI, Rev. 2/2 (PUAssembly) aa. Cable ARM /PNL Assembly Drawing, GE Dwg. No. I88C72%, Rev. 4 bb. Cable ARM /PNL - w DNS/INOP Assembly Drawing, GE Dwg. No. I88C7297, Rev 5
- 3. Qualification Plan 3.1 Requirements ne Qualification Requirement is to demonstrate by testing that the installed RBVRM systems, based cn the configurations defined in References 2.d through 2.i, inclusive, meet the requirements of MIL-STD-462D, CSil4,10 kHz to 400 MHz, at test levels of 83 dB A minimum with a target of 103 dB A. (Note: This requirement is a fixed test level over the entire frequency range and does not correspond to any of the curves in MIL-STD-461D, CSil4 1.) The criteria for passing qualification is given in paragraph 3.5.
3.2 RBVRMInstalledSystem Architecture Section I describes the system components and the physical mounting locations for the installed RBVRM systems, nose components are interconnected in the plant with various signal cables Page 4 of 12 can. .noc
. Crowns Fctry RBVRM DRF No. A00-02506-6 Mt1, STD.462D, CSI14 Qualification Plan R,eport
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described below. The actual installation was by a TVA Design Change Notice (DCN)
- (Reference 2.y) which in turn incorporated the GE provided instsilation requirements.
De RBVRM Chassis is mounted on chassis " slides" installed in existing control panels (References 2.r.,2.s and 2.t), ne chassis is " clamped" in with adjustable " pawls" to retain the chassis in the panel, ne associated interface Panel is bolted to the control panel structure behind the chassis (References 2.r.,2.s and 2.t). Two factory fabricated, shielded cables connect each RBVRM Chassis to its respective Interface Panel (References 2.aa, and 2.bb). Each of those cables carry all signals as.,ociated with two Digital Sensor & Converter channels, including both signals to and from the Digital Sensor & Converter and the digital and analog recorder outputs from the RBVRM Chassis associated with those two Digital Sensor & Converter channels. One of the two cables also carries the Chassis "inop/downscale" alarm signal. De two cables are routed as part of a " cable harness" (Reference 2.z) inside the 9 10 panel on cable retractors from the Chassis to the interface Panel which is located immediately behind the Chassis. On the same retractor is one unshielded 120 Vac power cable to the Chassis, ne 120 Vac power cable " splits" from the other two cables at the Interface Panel and routes from there to Panel 9 10 terminal boards. De a separate ground lead in the power cable connects from the panel terminal board to the panel ground bus (References 2.g. 2.h, and 2.i).
Two shielued, multiconductor cables route from the Interface Panel to the two associated Splitters, one from each of two connectors on the interface Panel to a connector on each of the two associated Splitters (two cables total per Chassis / Interface Panel). Per Refe ences 2.d,2.e,2.f, and 2.q, these cables route in metallic conduit for most of the path to the Splitter. Each cable carries all signals to and from the two Digital Sensor & Converters associated with each Splitter (four total Digital Sensor
& Converters), ne shields are connected at both ends of the cables.
Four shielded, multiconductor cables route from the two Splitten to the four associated Digital Sensor
& Converters, one from each of two connectors on each Splitter to a connector on the associated Digital Sensor & Converter (four cables total per Chassis / Interface Panel). Each cable carries all signals to and from the associated Digital Sensor & Converter. Per References 2.r,2.s, and 2.t, these cables are short (a few feet) and tied in position away from other cables. De shields are connected at both ends of the cables. Both the Splitters and Digital Sensor & Converters are mounted to either metal ducts or metal columns (Referer:ces 2.r,2.s, and 2.t).
One shielded, multiconductor cable routes from one connector on the Interface Panel to Panel 9-10 terminal boards ne cable carries the analog outputs to the recorders for all for Digital Sensor &
Converter channels associated with that Chassis / Interface Panel. From the Panel 9-10 terminal boards, multiple shielded, multiconductor cables route to the respective recorders. He shield of the cable is connected from the panel terminal board to the panel ground bus (References 2.r,2.s and 2.t).
A set of unshielded conductors routes from terminal board points on the Interface Panel to Panel 9-10 terminal board points. Rese conductors carry relay contact outputs from RBVRM (from relays on the Interface Panel) to other systems or alarms. From the Panel 410, separate multiconductor unshielded cables route to the final destinations. Per References 2.d 2.e,2.f and 2.q, these cables route in metallic conduit outside Panel 9-10.
De combination of mounting structures and grounded shields provide grounding for the RBVRM Chassis, the Interface Panels, Splitters, and the Digital Sensor & Conveners.
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4 Browns Ferry RBVRM y DRF Ns. A00 02506 6 MIL.STD-462D, CSI1 qualifwation Plan and Report
,3.3 Test ConMgu andJustMestion ne following paragraphs describe the equipment included in the cor.fyration used for the qualification testing.
3J.1 Test Coenguratios 3.3.1.1 RB VRM Chassit One RBVRM Chassis. The chassis is a prototype chassis that has been confumed to be electrically equivalent to the installed RBVRM Chassis. The chassis utilizes one Low Voltage Power Supply (LVPS) of the original design and one of the current replacement part design to assure that both types of LVPS are qualified. De Chassis is grounded via a ground lead under a bottom cover screw for the test.
3.3.1.2 laterface Panet One Interface Panel, ne Interface Panel is a prototype panel that is physically a little different from the RBVRM panel, it contains some additional circuitry to provide for more Digital Sensor &
Converter channels, but the applicable wiring and components (relays, resistors, etc.) have been confirmed to be identical to those on the RBVRM Interface Panel. De Interface Panel is grounded via a groand lead attached to one mounting slot for the test.
3.3.1.3 Spliner One simulated Splitter. The simulated Splitter includes wiring equivalent to that in the RBVRM Splitter, carries the cable shields through to the connected cables as does the RBVRM Splitter, and includes a current limiting resistor in the high voltage circuit, the only component in the RBVRM Splitter besides connectors. The simulated Splitter is grounded via a ground lead attached to one mounting car of one connector for the test.
3.3.1.4 DigitalSensor & Convererr One Digital Sensor & Converter. The Digital Sensor & Converte; is a prototype that has been confirmed to be electrically equivalent to the installed RBVRM Digital Sensor & Converter, Group 1 (Iow range), ne test Digital Sensor & Converter does not include a bug source. De Digital Sensor
& Converter is grounded via a ground lead attached to on mounting hole for the test.
3.3.1.5 RBVRMChassis-tointerfacePanelCaMr One RBVRM Chassis to interface Panel cable. De cable is a shielded prototype cable that has been confirmed to be electncally equivalent to the installed cable. The cable selected is the one that carries the chassis "inop/downscale" signal. The length is comparable to the installed cable length.
3.3.1.6 RBVRM Chassir120 Vac Power CaMe One RBVRM Chassis 120 Vac Power cable. The cable is an unshielded prototype cable that has been confirmed to be electrically equivalent to the installed cable. The len6th of the cable is comparable to the installed length, and is long enough to meet the criteria of MIL-STD.462D.
3.3.1.7 Interface Panel-to Splitter CsMe .
One Interface Panel-to.(simulated) Spliner Cable. He cable is a shielded prototype cable that has been confirmed to be electrically equivalent to the installed cable. De length of the cable is shorter than the installed length, but is long enough to meet the criteria of MIL-STD-462D.
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. B s Ferry RBVRM DRF No. A00 03506-6
- STD.462D, CSI14 Qualification Plan and Report Spikter4e-DigientSensor & Converter Cable.
One (simulated) Splitter to Digital Sensor & Converter Cable. The cable is a shielded prototype cable that has been confirmed to be electrically equivalent to the installed cable, including the shielding. The length of the cable is different than the installed length, but is long enough to meet the criteria of MIL-STD 462D.
3.3.1.9 Interface Panel-to-Recorder Analog Ouque Cable One Interface Panel to Recorder Analog Output cable, ne cable is a prototype cable with the same wiring and shielding configuration as the installed cable from the Interface Panel to the Panel 9-10 terminal boards, ne cable includes connections to all points used in the installed RBVRM systems.
The circuits in the cable are terminated with one kilohm resistors to simulate recorder loading. (Note:
The Interface Panel also includes an output connector for analog outputs to the plant computer. Dese circuits are not connected in the installed system. No connections are made to that connector for the test.) ne length of the cable may be shorter than the installed length, but is long enough to meet the criteria of MIL-STD-462D, 3.3.1.10 Interface Panel Digital Outputs-to-Panel 9-10 Terminal Boardt Cable One Interface Panel Digital Outputs-to-Panel 9 10 terminal boards cable. He cable is a prototype cable with the same wiring configuration (no shielding) as the installed cable fmm the Interface Panel to the Panel 9-10 terminal boards, ne cable includes connections to all points used in the installed RBVRM systems. The circuits in the cable are terminated with one kilohm resistors to approximately simulate relay loading. The length of the cable may be shortsr than the installed length, but is long enough to meet the criteria of MIL STD-462D, 3.3.1.11 Equyment Arrangement and Cable Routing The equipment is tested with components separated from each other, but individually grounded (no panel mounting). The actual physical placement is determined for convenience of the testing.
The RBVRM Chassis-to-interface Panel cable and the RBVRM Chassis 120 Vac power cable are strapped together between those two assemblies. The RBVRM Chassis 120 Vac power cable extends Feyond the Interface Panel a sufficient distance to meet the criteria of MIL-STD-462D.
De Interface Panel to -Splitter cable, the RBVRM Chassis 120 Vac Power cable, the Interface Panel- ,
to-Recorder Analog Output cable, and the Interface Panel Digital Outputs-to Panel 9-10 terminal boards cable are grouped together where they leave the Interface Panel.
3.3.1.12 TestIn}ection Points The MIL-STD-462D, CSil4 test calls for injecting test signals on cables or groups of cables. For the RBVRM testing, one injection point is the group of cables leaving the Interface Panel (simultaneous injection for all cables). A second injection point is the Splitter-to-Digital Sensor & Converter cable at the Digital Sensor & Converter end. No injection is planned on the RBVRM Chassis-to-interface Panel cable or at the simulated Splitter end of its associated cables.
3.3 2 Test Configuration Justification 3.3.2.1 General ne MIL-STD-462D, CSil4 testing is a " bulk cable injection" susceptibility test. It tests only for susceptibility of the equipment to EMI signals picked up by the cables. He test involves " injecting" test signals onto cables connected to the " equipment under test"(EUT), and is performed by injecting Page 7 of 12 cm..mc
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j . Browns Ferry RBVRM DRF No. A00 03506-6 Mil Sm4620,CSil4 Qualification Plan and Report i EMI (noise) signals onto the cables near the equipment. Thefore, the following evaluation is based i, on assessing the applicability of the tested configuration (ELTT) to the installed RBVRM system l relative to EMI susceptibility to noise entering via the input and output cables, i.e., confirming that the EUT configuration adequately represents the installed RBVRM system, i
,i 3.3.12 RBVRMGessk
! The installed RBVRM system includes two RBVRM Chassis, each locally grounded. However, the l Chassis operate independently from each other and connect to the external systems only via the
- Interface Panel and se 120 Vac power cable, both of which are included in the tested configuration.
! Thmfore, te'st of one Chassis locally grounded is sufficient to represent the installed configuration.
3.13 InterfacePenet i The installed RBVRM system includes two RBVRM Interface Panels, each locally grounded.
l However, the Interface Panels operate ietly from each other and connect to the external l systems only via the cables to the Splitters, and the digital and analog output cables, all of which are i included in the tested configuration. Therefore, test of one Interface Panel locally grounded is j sufficient to represent the installed configuration.
- 3.3.Ld SPaser l The installed RBVRM system includes four Splitters, each locally grounded. However, the Splitters i operate in&gaistly from each other and connect to other equipment only via the cables to the
- Interface Panel and to the Digital Sensor & Converters, all of which are included in the tested configuration. Further, the Splitter has no active function and includes only one component, a current i limiting resistor in the HVPS circuit. nat current limiting resistor is included in the one simulated l Splitter included in the tested configurati.m. Therefore, test of one simulated Splitter locally j grounded is sufficient to represent the installed configuration.
l 3.3.25 DigitalSensor& Converter l The installed RBVRM system includes eight Digital Sensor & Converters, each locally grounded.
! However, the Digital Sensor & Converters operate independently from each other and connect to other equipment only via the cable to the Splitter, which is included in the tested configuration. There l are two ranges of Digital Sensor & Converter, but the internal circuitry including that connected to i the incoming cable is identical berus the two. Therefore, test of one Digital Sensor & Converter locally grounded is sufficient to represent the installed configuration, l
i l 3.3.16 RBVRM Gansk-o Interface Panel CaMe
! The installed RBVRM system includes four shielded RBVRM Chassis to interface Panel cables, two
[ each between each Chassis and its associated Interface Panel. As with the Chassis and Interface i Panels, the cables associated with different Chassis have no interrelation or common circuitry. Even the two cables that route between common Chassis and Interface Panels share no circuits, and are
! individually shielded. De only potential common pickup is with output conductors that route in the same output cables from the Interface Panel. However, all output conductors from the Interface Panel are included in the test cables (see paragraphs 3.3.2.10 and 3.3.2.11), so any additional pickup in i those cables or in the wiring in the Interface Panel are adequately covered. Therefore, a test with one I shiended RBVRM Chassis to-Interface Panel cable is sufficient to represent the installed j configuration.
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. Browns Ferry RBVRM DRF No. A00 03506-6 MIL STD-462D, CSI14 Qualification Plan and Report 3,3.2.7. RBVRM Chassar i20 Yar Power CaMe
'ne installed RBVRM system includes two unshielded RBVRM Chassis 120 Vac Power cables, one to each Chassis. As with the Chassis, the cables associated with different Chassis have no interrelation or common circuitry except possibly via the 120 Vac power system, but those effects are addressed by the actual test. Therefore, a test with one unshielded RBVRM Chassis 120 Vac Power cable is :.ufficient to represent the installed configuration.
3.3.2.8 Interface Panel-to-Spthter CaMe ne installed RBVRM system includes four shielded Interface Panel-to Splitter cables, two from each Interface Panel, one of those to each ofits associated Splitters. As with the Spliners and the RBVRM Chassis-to interface Panel cables, the laterface Panel to Splitter cables have no interrelation or common circuitry. Therefore, a test with one shielded Interface Panel-to Splitter cable is sufficient to represent the installed configuration.
3.3.2.9 Spikter-to-D<alSensor & Converter CaMe.
The installed RBVRM system includes eight shielded Splitter to Digital Sensor & Convertei cables, two from each Splitter, one of those to each of the Splitter's associated Digital Sensor & Convenas.
Except for the two cables from one Splitter, the Splitter-to Digital Sensor & Converter cables have w interrelation or common circuitry. De two cables from the same Splitter do interconnect at the Splitter. However, the planned test injects the noise signal directly onto the Splitter to Digital Sensor
& Converter cable at the Digital Sensor & Converter end, and onto the Interface Panel-to-Splitter cable at the Interface Panel end. Derefore, any possible interaction between the two cables is covered by the actual test, so a test with one shielded Splitter-to-Digital Sensor & Converter cable is sufficient to represent the installed configuration.
3.3.2.10 Interface Panel-to-Recorder Analog Output CaMe ne installed RBVRM system includes two shielded Interface Panel to-Recorder Analog Output cables, one from each Interface Panel to the associated Panel 9 10 terminal boards. As with the Chassis and Interface Panet, the Interface Panel.to Recorder Analog Output cables have no interrelation or common circuitry within the RBVRM. Any effects extemal to the RBVRM system are simulated by the testing per MIL-STI)-462D, CSil4. Further, the analog outputs are not required for safety-related functions, so the purpose of this connection is to simulate any noise input path that may affect Chassis operation. All signal conductors used in the installed systems are included to provide the maximum " pickup" De load ends of these conductors are terminated with loads comparable to the actual loads to simulate the noise pickup that would occur in the installed systems.
Derefore, a test with one shielded interface Panel-to Reconter Analog Output cable is sufficient to represent the installed configuration.
3.3.2.11 Interface Panet D&iral Ougpua-to Panel 9-10 Terminal Boardt CaMe ne installed RBVRM system includes two unshielded Interface Panel Digital Outputs to-Panel 9-10 terminal boards cables, one from each Interface Panel to the associated Panel 9-10 terminal boards.
As with the Chassis and Interface Panel, the Interface Panel Digital Outputs-to-Panel 9-10 terminal boards cables have no interrelation or common circuitry within the RBVRM. Any effects external to the RBVRM system are simulated by the testing per MIL-STD 462D, CSil4. De digital outputs are electro-mechanical relay outputs so they are not affected by the noise levels involved in this test. De purpose of this connection is to simulate any noise input path that may affect Chassis operation. All signal conductors used in the installed systems are included to provide the maximum " pickup". De load ends of these conductors are terminated with loads comparable to the actual loads to simulate the Page 9 of 12 csm_.noe
Browns Ferry RBVRM _ DRF Ns. A00 025064 MIL STD 462D, CSI14 Qualification Plan and Report l
, noise pickup that would occur in the installed systems. Derefore, a test with one unshielded j Interface Panet Digital Outputs to Panel 910 Terminal Boards cable is sufficient to represent the j installed configuration.
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- 3.3.2.12 Equ(pneent Arrangeneent and CsNr Routing
- The equipment in the installed RBVRM systems is mounted iii control room Panel 9 10 (Chassis and
[ Interface Pane!) and locally on ducts or mounting plates. For some EMI tests, the mounting structure i' offers shielding which effects its performance or response to the EMI. For the MIL-STD-462D, j k CSI 14 test, however, all noise is injected into the cables near the equipment, nerefore, mounting I outside a panel, but with the enulpment grounded in the same manner as in the plant, provides a
!j representative test, i in the installed configuration, the RBVRM Chassis-to interface Panel cables are mounted on l retractors behind the Chassis, in front of the Interface Panel, and totally enclosed in the Panel. Dere j is no exposure to pick up noise signals on those cables due to coupling with other cables except via l- the RBVRM Chassis 120 Vac Power cable, Consequently, strapping these two cables together i provides a configuration comparable to that of the installed RBVRM system, ne remainder of the i cabling is routed separately in the installed RBVRM system in areas that may be exposed to noise
- coupling from other cables, so the test configuration and test injection locations (see paragraph
! 3.3.2.13) for the test configuration adequately represent the installed RBVRM system coniburstion.
l 3.3.2.13 Testin}ection Poinne t
Due to the mounting locations and cable routing, the RBVRM Chassis-to interface Panel cables are i not subject to noise pickup directly due to coupling with other circuits except possibly via the l RBVRM Chassis 120 Vac Power cable, nerefore, the test configuration without direct injection of l noise signals onto that cable adequately represents the instal!ad RBVRM system.
l De cables leaving the RBVRM Chassis / Interface Panel area have the potential to pick up noise due
! to coupling with other cables. Due to different routes and use of metal conduit, the noise pickup even i on unshielded cables is likely to be small, and not common to multiple cables. However, the test configuration and test signal injection injects the noise in all cables that might carry noise to the j RBVRM Chassis simultaneously so that any additive effect is included in the test.
- ne Digital Sensor & Converter operates separately from the Chassis, so injection of noise separately into the Digital Sensor & Converter cable reasonably represents the installed RBVRM system.
- Injecting signals directly at the Digital Sensor & Converter is conservative since in the installed j- RBVRM system, the Splitter-to Digital Sensor & Converter cables are routed away from all other i cables neu the deeiamion and in conduit before that. Further, for the HVPS the current limiting l resistor provides some buffering for noise on the HVPS circuit. Therefore, the injection of noise
! signals directly la front of the Digital Sensor & Converter is conservative relative to the installed l RBVRM system.
3.4 Operation and hfonitoring During Testing 4
j De critical functions of the RBVRM are the trip outputs. To accomplish these, the RBVRM Chassis and the Digital Sensor & Converter must correctly process signals. De actual trip outputs from the j
' RBVRM are provided by driving electro mechanical relays on the Interface Panel. The relays are ;
l j- judged not to be susceptil le to mis-operation due to EMI levels related to the planned test. There.ixe, 4
f 1
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Browns Ferry RBVRM DRF Ns. A00 02506 6 Mit.-STD 462D, CSil4 Qualification Plan and Report
, it is necessary only to demonstrate that the RBVRM Chassis and the Digital & Converter continue to operase correctly during the EMI noise injection.
De possible eNects on the Digital Sensor & Converter that are significant are those that either aNect the counts rate or the digital response. EMI, by its nature, will either have no eNect on counts or result in extraneous counts unless it aNocts the disital processing. De possible eNocts on the RBVRM Chassis that are significant are those that either aNoct the processing of the digital signal from the Digital sensor & Converter or that disrupt the digital processing. To detect these eNects, should they occur, the RBVRM Chassis is set up in the Operate mode during testing with self test continuously running. De Digital Sensor & Converter has no bug source in the test configuration,:;s the counting level is very low based only on background, and is mostly off the bergraph scale, ne Digital Sensor & Converter in the test is a low range sensor, ne processed range in the Chassis is set to 1.00E 2 to 1.00E+2 mR/hr.
To detect extraneous increases in counts (that could result from EMI) while allowing for background count variation, the trip setpoint is set at 5.00E-2 mR/hr (1/2 decade up fun the bottom of the active scale) with the trip reset point set to 4.00E 2 mR/hr. In addition, even though the signal is typically below the active range (1.00E 2 to 1.00E+2 mR/hr), background levels typically result in count levels that are on scale for the N'JMAC equipment (i.e., counts will be indicated). De actual level is determined at the actual test lab, nose background counts are monitored and recorded to identify margin.
To detect unacceptable effects on the digital message and digital processing, the self test status is monitored. Self-test includes a monitor on loss of successive messages from the Digital Sensor &
Converter as well as internal RBVRM Chassis parameters, less of too many messages in a rcw results in a self test alarm. In addition, internal diagnostic counters in the RBVRM Chassis record loss of messages that do not exceed the threshold. Monitoring those counters and other internal diagnostic information allows assessment of margin. Finally, to detect any effects on the Digital Sensor & Converter digital processing and non-counting functions, the current and high voltage values returned from the Digital Sensor & Converter are monitored for unusual behavior and periodically recorded.
Normal " Operate" mode operation of the channel with monitoring of the above information is
, sufficient to detect any effects of the EMI noise signal detrimental to RBVRM trip function operation.
3.5 Bases for Passing QusHRcadon The RBVRM isjudged to pass the qualificaten if the indicated radiation level during exposure does not exceed 5.00E 2 mR/hr(i.e., no high trip occurs) there are no self-test errors, and there is no unusual behavior exhibited by the Digital Sensor & Converter measured current and high voltage values.
- 4. Qualification Results The test was successfully completed at a level of 103 dB A over the range of 10 kHz to 400 MHz.
No anomalies or unusual behavior was observed at any time during the test.
De test was conducted in four" phases", each differing only in the " injection" point of the noise, ne injection points for the four phases were:
e input / outputs at the Interface Panel (recorder outputs, relay outputs, signal cable to Digital Sensor & Converter) e signal cable at Digital Sensor & Converter Page 1I of 12 cim noe
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-- Browns Ferry RBVRM DRF No. A00 02506-6 MIL STD 462D, CSil4 Qualification Plan and Report ee AC power input - line e AC power input-line & neutral For each of these phases, the " noise injection" cycle was repeated for 10 kHz to 400 MHz. During each of these phases, the RBVRM bargraph and digital mR/hr output readings were monitored, as was trip status. 'the mR/hr values as well as internal parameter values were recorded at 12 points during each of the phases.
The background radiation level at the test site varied between ~7E 3 mR/hr and -l.4E 2 mR/hr (statistical variation over time). These values are displayed digitally on the NUMAC RBVRM, but only values of IE 2 mR/hr and above are "on scale" for the bargraph. The background values were observed throughout the entire test, and recorded at 12 points during each test phase. There was no detectable disturbance in these values at any time during the test.
Current and high voltage values returned from the Digital Sensor & Converter were recorded at 12 points during each test phase to identify any disturbance in the Digital Sensor & Converter performance. The values were normal throughout the entire test.
The upscale trip setpoint was 5.00E-2 mR/hr (approximately 3 times the maximum background level
). Self test was also continuously running during the test. No upscale or self test trips occurred during any of the testing.
Internal " checksum error" and "lD error" counters record any message errors in the messages received by the RBVRM Chassis back from the Digital Sensor & Converter. These counters were checked at 12 points during each test phase No checksum or ID errors were recorded indicating that message transmission continued normally without disruption during the entire test.
- 5. Conclusion Based on the successful completion of the EMI testing of a representative RBVRM configuration, it is concluded that the installed RBVRM system at Browns Feny is determined to be qualified to MIL.
STD-462D, CSil4, at a level of 103 dB A over the frequency range of 10 kHz to 400 MHz.
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