RPM Gamma Detector Replacement | FRONTLINE Maintenance Tool

Last Updated: 04/23/2025 1:41 AM

The following table lists all the components that make up the document.

Title	Type	Status	Last Updated
Rapiscan PM-700 Pedestrian Monitor	Device	Published	06/20/2024 11:38 AM
Rapiscan VM-250 Vehicle Monitor	Device	Published	10/14/2024 9:50 AM
Rapiscan TM-850 Rail Monitor	Device	Published	09/18/2024 10:28 AM
7621 - 1401 - Establish Initial Conditions; Remark:	Procedure Step	Published	06/29/2023 5:37 PM
1401 - Establish Initial Conditions	Instruction	Published	09/30/2022 3:14 PM
7268 - 7231 - Close lane; Remark:7233	Procedure Step	Published	04/27/2023 7:01 PM
9053 - Warning : Traffic should temporarily be rerouted or halted during conduction of this pr...	Annotation	Published	09/27/2023 9:09 AM
7231 - Close lane	Instruction	Published	04/18/2023 1:00 PM
7233 - Use orange safety (traffic control) cones to setup barriers. Practice establi...	Remark	Published	04/24/2023 12:18 PM
7269 - 7232 - Open RPM door; Remark:7234	Procedure Step	Published	04/27/2023 7:02 PM
7232 - Open RPM door	Instruction	Published	04/18/2023 1:02 PM
7234 - Open all doors needed to access components.	Remark	Published	04/19/2025 7:48 PM
7454 - 7290 - Disable tamper switches; Remark:7416	Procedure Step	Published	06/02/2023 5:25 PM
7290 - Disable tamper switches	Instruction	Published	05/01/2023 8:14 AM
7416 - Use a magnet to disable tamper switches for all open doors. Use adhesive tape...	Remark	Published	06/02/2023 1:18 PM
8281 - 8280 - Disable both infrared occupancy sensors; Remark:8279	Procedure Step	Published	09/07/2023 8:39 PM
7351 - Note : It is good practice to verify all cables and connectors are labeled prior to ...	Annotation	Published	05/03/2023 11:25 AM
8280 - Disable both infrared occupancy sensors	Instruction	Published	09/07/2023 8:31 PM
8279 - Verify sensors mounted in control pillar door are receivers	Remark	Published	09/07/2023 8:39 PM
8287 - To disconnect sensor cable, turn collar counterclockwise and pull away from s...	Remark	Published	09/08/2023 12:34 PM
7270 - 7235 - Power off RPM; Remark:7236	Procedure Step	Published	09/01/2023 7:57 PM
7235 - Power off RPM	Instruction	Published	04/24/2023 12:30 PM
7236 - Move LD-260 switch to OFF position. The PWR ON	Remark	Published	04/27/2023 4:25 PM
8286 - 8285 - Uninstall VD-580; Remark:	Procedure Step	Published	09/08/2023 12:39 PM
8285 - Uninstall VD-580	Instruction	Published	09/08/2023 12:38 PM
8284 - 8283 - Disconnect BNC and MHV cables; Remark:8282	Procedure Step	Published	09/08/2023 12:45 PM
7352 - Note : It is good practice to verify all cables and connectors are labeled prior to ...	Annotation	Published	05/03/2023 11:27 AM
8283 - Disconnect BNC and MHV cables	Instruction	Published	09/08/2023 12:40 PM
8282 - Push toward connection, turn coupling nut counterclockwise, and pull away fro...	Remark	Published	09/08/2023 12:45 PM
8313 - 8311 - Remove three (3) mounting springs; Remark:8310	Procedure Step	Published	09/08/2023 2:28 PM
8312 - Note : Take care when removing springs, as they might snap back and become misplaced...	Annotation	Published	09/08/2023 2:28 PM
8311 - Remove three (3) mounting springs	Instruction	Published	09/08/2023 2:22 PM
8310 - Use needle nose pliers. Retain springs for reinstallation.	Remark	Published	09/08/2023 2:28 PM
8314 - 8309 - Remove VD-580; Remark:8308	Procedure Step	Published	09/08/2023 2:41 PM
8309 - Remove VD-580	Instruction	Published	09/08/2023 2:31 PM
8308 - Pull VD-580, using small side-to-side motion.	Remark	Published	09/08/2023 2:40 PM
8307 - 8306 - Uninstall faulty gamma detector; Remark:	Procedure Step	Published	09/08/2023 2:45 PM
8306 - Uninstall faulty gamma detector	Instruction	Published	09/08/2023 2:45 PM
8302 - 8301 - Remove metal brackets; Remark:8300	Procedure Step	Published	09/08/2023 2:52 PM
8301 - Remove metal brackets	Instruction	Published	09/08/2023 2:47 PM
8300 - Use small Phillips (PH1) screwdriver. Retain brackets and screws	Remark	Published	09/08/2023 2:51 PM
8303 - 8298 - Remove securing straps; Remark:8297	Procedure Step	Published	09/08/2023 3:00 PM
8299 - Caution : Detector may fall out of lead shielding when brackets and straps are removed....	Annotation	Published	09/08/2023 3:00 PM
8298 - Remove securing straps	Instruction	Published	09/08/2023 2:54 PM
8297 - Do NOT cut straps. Straps may be hook and loop (Velcro) or cable ties. Some w...	Remark	Published	09/08/2023 2:59 PM
8304 - 8296 - Remove faulty gamma detector; Remark:8295	Procedure Step	Published	09/08/2023 3:06 PM
8296 - Remove faulty gamma detector	Instruction	Published	09/08/2023 3:00 PM
8295 -	Remark	Published	09/08/2023 3:06 PM
3397 - 3395 - Label faulty component; Remark:3396	Procedure Step	Published	07/21/2024 6:59 AM
3395 - Label faulty component	Instruction	Published	08/07/2021 11:07 AM
3396 - Use tag or tape. Include date of removal, description of failure symptoms, co...	Remark	Published	08/09/2021 11:35 AM
8292 - 8291 - Install new gamma detector; Remark:	Procedure Step	Published	09/08/2023 3:10 PM
8291 - Install new gamma detector	Instruction	Published	09/08/2023 3:10 PM
8290 - 8289 - Set new gamma detector in place; Remark:8288	Procedure Step	Published	09/08/2023 3:24 PM
8289 - Set new gamma detector in place	Instruction	Published	09/08/2023 3:15 PM
8288 -	Remark	Published	09/08/2023 3:24 PM
8333 - 8332 - Fasten securing straps; Remark:8331	Procedure Step	Published	09/08/2023 3:31 PM
8332 - Fasten securing straps	Instruction	Published	09/08/2023 3:30 PM
8331 - Use hook and loop (Velcro) straps or long, heavy-duty cable ties. If cable ti...	Remark	Published	09/08/2023 3:31 PM
8334 - 8330 - Replace metal brackets; Remark:472	Procedure Step	Published	09/08/2023 3:37 PM
8330 - Replace metal brackets	Instruction	Published	09/08/2023 3:31 PM
472 - Use a small Phillips (PH1) screwdriver.	Remark	Published	07/22/2021 1:13 PM
8329 - 8328 - Install VD-580; Remark:	Procedure Step	Published	09/08/2023 3:41 PM
8328 - Install VD-580	Instruction	Published	09/08/2023 3:41 PM
8325 - 8324 - Reconnect VD-580 to photomultiplier tube; Remark:8323	Procedure Step	Published	09/08/2023 3:47 PM
8324 - Reconnect VD-580 to photomultiplier tube	Instruction	Published	09/08/2023 3:42 PM
8323 - The VD-580 has a notch that aligns with the tab on the photomultiplier tube	Remark	Published	09/08/2023 3:47 PM
8326 - 8322 - Reattach mounting springs; Remark:9071	Procedure Step	Published	09/08/2023 3:50 PM
8322 - Reattach mounting springs	Instruction	Published	09/08/2023 3:48 PM
9071 - Use needle nose pliers.	Remark	Published	09/27/2023 9:58 AM
8327 - 8320 - Reconnect BNC and MHV cables; Remark:8319	Procedure Step	Published	09/08/2023 3:56 PM
5553 - Caution : Correct placement of connectors and wiring is critical to proper operation.	Annotation	Published	10/28/2022 2:19 PM
8320 - Reconnect BNC and MHV cables	Instruction	Published	09/08/2023 3:55 PM
8319 - Ensure cables are connected correctly. Connector placement should not require...	Remark	Published	09/08/2023 3:56 PM
7279 - 7249 - Return equipment to normal operating condition; Remark:	Procedure Step	Published	04/27/2023 4:13 PM
7249 - Return equipment to normal operating condition	Instruction	Published	04/08/2025 3:22 PM
7280 - 7250 - Power on RPM; Remark:7251	Procedure Step	Published	04/27/2023 4:14 PM
7250 - Power on RPM	Instruction	Published	05/01/2023 8:31 AM
7251 - Move LD-260 switch to ON position. The LED PWR ON	Remark	Published	05/10/2023 3:14 PM
7468 - 7304 - Confirm RPM has restarted correctly; Remark:7487	Procedure Step	Published	06/02/2023 5:36 PM
7304 - Confirm RPM has restarted correctly	Instruction	Published	05/01/2023 8:31 AM
7487 - The SC-770 controller will display "OK" following Power On Self-Test (POST) a...	Remark	Published	06/02/2023 10:35 PM
7469 - 7254 - Confirm network connection; Remark:7255	Procedure Step	Published	06/02/2023 5:36 PM
7254 - Confirm network connection	Instruction	Published	04/27/2023 2:22 PM
7255 - Contact operators to confirm communications have been reestablished between RPM ...	Remark	Published	05/10/2023 3:15 PM
7840 - 7816 - Perform electronic alignment; Remark:7817	Procedure Step	Published	07/07/2023 11:12 PM
7816 - Perform electronic alignment	Instruction	Published	07/07/2023 9:55 PM
7817 - DET-RPM-RAP-CM01, RPM Electronic Alignment Procedure.	Remark	Published	04/13/2025 5:55 PM
8317 - 8316 - Enable both infrared occupancy sensors; Remark:8315	Procedure Step	Published	09/08/2023 4:14 PM
7263 - Caution : Correct placement of connectors and wiring is critical to proper operation.	Annotation	Published	04/24/2023 2:32 PM
8316 - Enable both infrared occupancy sensors	Instruction	Published	09/08/2023 4:11 PM
8315 - To reconnect sensor cable, align connectors, push towards sensor, and turn th...	Remark	Published	09/08/2023 4:13 PM
8318 - 7450 - Enable tamper switches; Remark:7348	Procedure Step	Published	09/08/2023 4:20 PM
7450 - Enable tamper switches	Instruction	Published	06/02/2023 4:42 PM
7348 - Remove all magnets and/or adhesive tape from door switches.	Remark	Published	09/17/2023 10:23 PM
7283 - 7256 - Close and lock all RPM doors; Remark:	Procedure Step	Published	09/01/2023 11:45 PM
7256 - Close and lock all RPM doors	Instruction	Published	04/27/2023 2:21 PM
7842 - 7820 - Inform system operators upon completion of maintenance action; Remark:	Procedure Step	Published	07/07/2023 11:15 PM
7820 - Inform system operators upon completion of maintenance action	Instruction	Published	07/07/2023 10:02 PM
322 - 321 - Document maintenance actions; Remark:	Procedure Step	Published	06/17/2021 9:49 AM
321 - Document maintenance actions	Instruction	Published	04/21/2025 11:19 AM
2869 - 2585 - Document maintenance performed; Remark:2866	Procedure Step	Published	06/18/2021 5:58 PM
2585 - Document maintenance performed	Instruction	Published	07/09/2021 12:15 PM
2866 - Record observations, times, and results for the maintenance report.	Remark	Published	04/21/2025 11:39 AM
4706 - 4705 - Submit report; Remark:4864	Procedure Step	Published	06/29/2022 9:50 AM
4705 - Submit report	Instruction	Published	06/29/2022 9:50 AM
4864 - As specified by management or contractual obligations.	Remark	Published	07/28/2022 1:36 PM
Corrective Maintenance Procedure	Document Type	Published	03/02/2020 3:32 PM
minutes	Duration	Published	05/26/2022 11:41 AM
Upon failure of the gamma detector	Frequency	Published	09/07/2023 7:35 PM
Warning	Annotation Type	Published	03/02/2020 3:25 PM
Note	Annotation Type	Published	03/02/2020 3:25 PM
Caution	Annotation Type	Published	03/02/2020 3:24 PM
Technician 2	Skill Level	Published	04/09/2020 1:17 AM
Keys to access RPM	Replacement Parts	Published	04/27/2023 6:56 PM
Magnets and adhesive tape to disable door tamper switches	Replacement Parts	Published	06/02/2023 10:08 PM
Needle nose pliers	Tools	Published	05/06/2020 4:10 PM
Small Phillips (PH1) screwdriver	Tools	Published	05/14/2020 2:48 PM
Ladder: 2 meters, 6 feet tall; non-conducting	Replacement Parts	Published	09/01/2023 9:34 PM
Orange/yellow safety vest	Replacement Parts	Published	04/27/2023 6:56 PM
Safety shoes	Replacement Parts	Published	04/27/2023 6:56 PM
Gloves	Replacement Parts	Published	05/10/2023 3:28 PM
Protective headwear: glasses, hard hat	Replacement Parts	Published	05/10/2023 3:31 PM
Orange traffic cones	Replacement Parts	Published	04/27/2023 6:56 PM
Disable tamper switch	Image	Published	09/07/2023 8:22 PM
Disable Tamper Switch	Image	Published	06/02/2023 2:28 PM
infrared sensor receiver	Image	Published	09/07/2023 8:37 PM
occupancy sensor receiver	Image	Published	09/07/2023 8:38 PM
Disconnect sensor cable	Image	Published	09/08/2023 12:27 PM
Pull cable away from sensor	Image	Published	09/08/2023 12:33 PM
LD-260 Disconnect Switch Power Off	Image	Published	04/24/2023 12:49 PM
Disconnect BNC and MHV cables	Image	Published	09/08/2023 12:44 PM
Remove three mounting springs	Image	Published	09/08/2023 2:26 PM
Remove VD-580	Image	Published	09/08/2023 2:38 PM
Remove metal brackets	Image	Published	09/08/2023 2:50 PM
Remove metal brackets 2	Image	Published	09/08/2023 2:51 PM
Remove securing straps	Image	Published	09/08/2023 2:58 PM
Remove faulty gamma detector	Image	Published	09/08/2023 3:02 PM
Remove faulty gamma detector 2	Image	Published	09/08/2023 3:05 PM
Set new gamma detector in place	Image	Published	09/08/2023 3:17 PM
Reconnect VD-580	Image	Published	09/08/2023 3:45 PM
Reconnect VD-580 (2)	Image	Published	09/08/2023 3:47 PM
Reattach mounting springs	Image	Published	09/27/2023 9:57 AM
Reconnect BNC and MHV cables	Image	Published	09/08/2023 3:54 PM
Reconnect BNC and MHV cables 2	Image	Published	09/08/2023 3:54 PM
LD-260 Disconnect Switch Power On	Image	Published	05/04/2023 3:37 PM
reconnect occupancy sensors	Image	Published	09/08/2023 4:06 PM
reconnect occupancy sensors 2	Image	Published	09/08/2023 4:08 PM
reconnect occupancy sensors 3	Image	Published	09/08/2023 4:10 PM
Remove all magnets and or adhesive tape from door switches	Image	Published	09/08/2023 4:18 PM
Remove Magnet on Tamper Switch	Image	Published	06/02/2023 4:31 PM

DET-RPM-RAP-CM33

Replace a gamma detector on a Rapiscan Radiation Portal Monitor (RPM). There are two (2) models of gamma detectors, DA630 and DA1248. The DA630 model is used in vehicle (VM-250) and pedestrian (PM-700) RPMs. The DA1248 is used in train (TM-850) RPMs.

Equipment Hierarchy

Rapiscan PM-700 Pedestrian Monitor

Rapiscan VM-250 Vehicle Monitor

Rapiscan TM-850 Rail Monitor

Frequency

Upon failure of the gamma detector

Technician Level

Technician 2

x 2

Duration

Time increment

minutes

Length of time

120

Tools Required

Keys to access RPM

Magnets and adhesive tape to disable door tamper switches

Needle nose pliers

Small Phillips (PH1) screwdriver

Ladder: 2 meters, 6 feet tall; non-conducting

Orange/yellow safety vest

Safety shoes

Gloves

Protective headwear: glasses, hard hat

Orange traffic cones

Materials Required

For TM-850: DA1248 Gamma Detector (Rapiscan Part #8244)

For VM-250 or PM-700: DA630 Gamma Detector (Rapiscan Part #8200A)

Long, heavy-duty cable ties

Originators

Brian Tucker

Yavor Andreev

Vasil Vasilev

Originating Organization

PNNL; Theta Consult

Approver

Cody Hostick

Safety Concerns

Traffic

Additional Retest Requirements Information

DET-RPM-RAP-CM01, RPM Electronic Alignment

Final Documentation

Corrective maintenance report

Departmental Coordination

Prior to arrival, notify operators concerning expected work, duration, and anticipated alarms and fault indications.

Date of Origin

2021-07-01

Version #

Revision Date

2023-09-07

Revision Author

Paul Francik

Step 1

Main Step

7621 - 1401 - Establish Initial Conditions; Remark:

Step 00

1401 - Establish Initial Conditions

Establish Initial Conditions

7268 - 7231 - Close lane; Remark:7233

9053 - Warning : Traffic should temporarily be rerouted or halted during conduction of this pr...

Type

Warning

Traffic should temporarily be rerouted or halted during conduction of this procedure to ensure maintenance provider safety and to prevent unscreened vehicles from passing.

Step 00

7231 - Close lane

Close lane

7233 - Use orange safety (traffic control) cones to setup barriers. Practice establi...

Use orange safety (traffic control) cones to setup barriers. Practice established safety protocols.

7269 - 7232 - Open RPM door; Remark:7234

Step 00

7232 - Open RPM door

Open RPM door

7234 - Open all doors needed to access components.

Open all doors needed to access components.

7454 - 7290 - Disable tamper switches; Remark:7416

Step 00

7290 - Disable tamper switches

Disable tamper switches

7416 - Use a magnet to disable tamper switches for all open doors. Use adhesive tape...

Use a magnet to disable tamper switches for all open doors. Use adhesive tape to disable older mechanical switches.

8281 - 8280 - Disable both infrared occupancy sensors; Remark:8279

7351 - Note : It is good practice to verify all cables and connectors are labeled prior to ...

Type

Note

It is good practice to verify all cables and connectors are labeled prior to disconnection.

Step 00

8280 - Disable both infrared occupancy sensors

Disable both infrared occupancy sensors

8279 - Verify sensors mounted in control pillar door are receivers

Verify sensors mounted in control pillar door are receivers

8287 - To disconnect sensor cable, turn collar counterclockwise and pull away from s...

To disconnect sensor cable, turn collar counterclockwise and pull away from sensor.

7270 - 7235 - Power off RPM; Remark:7236

Step 00

7235 - Power off RPM

Power off RPM

7236 - Move LD-260 switch to OFF position. The PWR ON

Move LD-260 switch to OFF position. The PWR ON LED will turn off.

Step 2

Main Step

8286 - 8285 - Uninstall VD-580; Remark:

Step 00

8285 - Uninstall VD-580

Uninstall VD-580

8284 - 8283 - Disconnect BNC and MHV cables; Remark:8282

7352 - Note : It is good practice to verify all cables and connectors are labeled prior to ...

Type

Note

It is good practice to verify all cables and connectors are labeled prior to disconnection.

Step 00

8283 - Disconnect BNC and MHV cables

Disconnect BNC and MHV cables

8282 - Push toward connection, turn coupling nut counterclockwise, and pull away fro...

Push toward connection, turn coupling nut counterclockwise, and pull away from connection.

8313 - 8311 - Remove three (3) mounting springs; Remark:8310

8312 - Note : Take care when removing springs, as they might snap back and become misplaced...

Type

Note

Take care when removing springs, as they might snap back and become misplaced

Step 00

8311 - Remove three (3) mounting springs

Remove three (3) mounting springs

8310 - Use needle nose pliers. Retain springs for reinstallation.

Use needle nose pliers. Retain springs for reinstallation.

8314 - 8309 - Remove VD-580; Remark:8308

Step 00

8309 - Remove VD-580

Remove VD-580

8308 - Pull VD-580, using small side-to-side motion.

Pull VD-580, using small side-to-side motion.

Step 3

Main Step

8307 - 8306 - Uninstall faulty gamma detector; Remark:

Step 00

8306 - Uninstall faulty gamma detector

Uninstall faulty gamma detector

8302 - 8301 - Remove metal brackets; Remark:8300

Step 00

8301 - Remove metal brackets

Remove metal brackets

8300 - Use small Phillips (PH1) screwdriver. Retain brackets and screws

Use small Phillips (PH1) screwdriver. Retain brackets and screws

8303 - 8298 - Remove securing straps; Remark:8297

8299 - Caution : Detector may fall out of lead shielding when brackets and straps are removed....

Type

Caution

Detector may fall out of lead shielding when brackets and straps are removed.

Step 00

8298 - Remove securing straps

Remove securing straps

8297 - Do NOT cut straps. Straps may be hook and loop (Velcro) or cable ties. Some w...

Do NOT cut straps. Straps may be hook and loop (Velcro) or cable ties. Some wire ties can be released by pushing on tab

8304 - 8296 - Remove faulty gamma detector; Remark:8295

Step 00

8296 - Remove faulty gamma detector

Remove faulty gamma detector

8295 -

3397 - 3395 - Label faulty component; Remark:3396

Step 00

3395 - Label faulty component

Label faulty component

3396 - Use tag or tape. Include date of removal, description of failure symptoms, co...

Use tag or tape. Include date of removal, description of failure symptoms, country, site, and lane number. Dispose per Nuclear Smuggling Detection and Deterrence (NSDD) guidance or contractual requirements.

Step 4

Main Step

8292 - 8291 - Install new gamma detector; Remark:

Step 00

8291 - Install new gamma detector

Install new gamma detector

8290 - 8289 - Set new gamma detector in place; Remark:8288

Step 00

8289 - Set new gamma detector in place

Set new gamma detector in place

8288 -

8333 - 8332 - Fasten securing straps; Remark:8331

Step 00

8332 - Fasten securing straps

Fasten securing straps

8331 - Use hook and loop (Velcro) straps or long, heavy-duty cable ties. If cable ti...

Use hook and loop (Velcro) straps or long, heavy-duty cable ties. If cable ties were cut and/or new wire ties are used, the lead shielding must be loosened to insert a new wire tie. This is a difficult process.

8334 - 8330 - Replace metal brackets; Remark:472

Step 00

8330 - Replace metal brackets

Replace metal brackets

472 - Use a small Phillips (PH1) screwdriver.

Use a small Phillips (PH1) screwdriver.

Step 5

Main Step

8329 - 8328 - Install VD-580; Remark:

Step 00

8328 - Install VD-580

Install VD-580

8325 - 8324 - Reconnect VD-580 to photomultiplier tube; Remark:8323

Step 00

8324 - Reconnect VD-580 to photomultiplier tube

Reconnect VD-580 to photomultiplier tube

8323 - The VD-580 has a notch that aligns with the tab on the photomultiplier tube

The VD-580 has a notch that aligns with the tab on the photomultiplier tube

8326 - 8322 - Reattach mounting springs; Remark:9071

Step 00

8322 - Reattach mounting springs

Reattach mounting springs

9071 - Use needle nose pliers.

Use needle nose pliers.

8327 - 8320 - Reconnect BNC and MHV cables; Remark:8319

5553 - Caution : Correct placement of connectors and wiring is critical to proper operation.

Type

Caution

Correct placement of connectors and wiring is critical to proper operation.

Step 00

8320 - Reconnect BNC and MHV cables

Reconnect BNC and MHV cables

8319 - Ensure cables are connected correctly. Connector placement should not require...

Ensure cables are connected correctly. Connector placement should not require force. Rotate to align connector notches. Push toward connection and turn coupling nut clockwise.

Step 6

Main Step

Correct placement of connectors and wiring is critical to proper operation.

Step 00

Main Step

Corrective Maintenance Procedure

Percent Complete

100.00

Percent Complete W/Media

100.00