RPM Neutron Detector Contaminant Removal | FRONTLINE Maintenance Tool

Last Updated: 04/25/2025 1:43 AM

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

Title	Type	Status	Last Updated
Rapiscan VM-250 Vehicle Monitor	Device	Published	10/14/2024 9:50 AM
Rapiscan PM-700 Pedestrian Monitor	Device	Published	06/20/2024 11:38 AM
Rapiscan TM-850 Rail Monitor	Device	Published	09/18/2024 10:28 AM
9584 - 9543 - Neutron Tube Serial Number; Remark:	Procedure Step	Published	10/11/2023 8:02 AM
9543 - Neutron Tube Serial Number	Instruction	Published	10/10/2023 3:49 PM
9585 - 9544 - Record serial number; Remark:9546	Procedure Step	Published	10/11/2023 8:02 AM
9544 - Record serial number	Instruction	Published	10/10/2023 3:49 PM
9546 - Only performed on detector tubes removed from the RPM.	Remark	Published	10/10/2023 4:18 PM
10325 - 10324 - Remove MHV Outer Connector Shell; Remark:	Procedure Step	Published	11/18/2023 2:45 PM
10324 - Remove MHV Outer Connector Shell	Instruction	Published	11/18/2023 2:45 PM
9586 - 9547 - Remove MHV outer connector shell; Remark:9548	Procedure Step	Published	10/11/2023 8:04 AM
9545 - Caution : Oils from skin may contaminate the insulating surfaces. Either lint-free cott...	Annotation	Published	10/10/2023 3:51 PM
9604 - Caution : Avoid tearing or binding the rubber O-ring at the base of the connector shell...	Annotation	Published	10/11/2023 11:09 AM
9547 - Remove MHV outer connector shell	Instruction	Published	10/10/2023 4:19 PM
9548 - Use adjustable wrench. Loosen and unscrew connector shell.	Remark	Published	04/13/2025 6:08 PM
9587 - 9549 - Confirm O-ring is positioned above threaded surface and undamaged; Remark:9550	Procedure Step	Published	10/11/2023 8:05 AM
9549 - Confirm O-ring is positioned above threaded surface and undamaged	Instruction	Published	10/10/2023 8:27 PM
9550 - The O-ring size is 0.79 mm (0.031 in.) cross section by 19.69 mm (0.775 in.) ...	Remark	Published	10/10/2023 8:30 PM
10329 - 10328 - Remove Teflon Insulator Ring; Remark:	Procedure Step	Published	11/18/2023 2:55 PM
10328 - Remove Teflon Insulator Ring	Instruction	Published	11/18/2023 2:55 PM
9588 - 9551 - Remove Teflon insulator ring from ceramic core insulator; Remark:9552	Procedure Step	Published	10/11/2023 8:05 AM
9573 - Caution : Do not bend or twist the high voltage wire lead.	Annotation	Published	10/10/2023 10:12 PM
9551 - Remove Teflon insulator ring from ceramic core insulator	Instruction	Published	10/10/2023 8:38 PM
9552 - Carefully pull Teflon insulator ring along the tube axis	Remark	Published	04/13/2025 6:07 PM
10327 - 10326 - Inspect Neutron Tube Insulator; Remark:	Procedure Step	Published	11/18/2023 2:56 PM
10326 - Inspect Neutron Tube Insulator	Instruction	Published	11/18/2023 2:56 PM
9589 - 9553 - Examine surface condition of neutron tube insulator; Remark:9554	Procedure Step	Published	04/13/2025 6:15 PM
9553 - Examine surface condition of neutron tube insulator	Instruction	Published	04/13/2025 6:07 PM
9554 - Questionable insulator	Remark	Published	10/10/2023 9:37 PM
9555 - Typical insulator	Remark	Published	04/13/2025 6:07 PM
9590 - 9556 - Clean Insulator Core and Ring; Remark:	Procedure Step	Published	10/11/2023 8:12 AM
9556 - Clean Insulator Core and Ring	Instruction	Published	10/10/2023 9:40 PM
9591 - 9557 - Rinse ceramic and Teflon insulators; Remark:9558	Procedure Step	Published	04/13/2025 6:15 PM
9559 - Warning : Use nitrile gloves as sensitive skin may react to the alcohol	Annotation	Published	10/10/2023 9:52 PM
9560 - Caution : For quality check, spray alcohol on a piece of clean glass and let evaporate....	Annotation	Published	10/10/2023 9:54 PM
9557 - Rinse ceramic and Teflon insulators	Instruction	Published	04/13/2025 6:07 PM
9558 - Using a stream spray of alcohol, coat insulators and allow to evaporate.&nbsp...	Remark	Published	10/10/2023 9:49 PM
9592 - 9561 - Wipe insulator; Remark:9562	Procedure Step	Published	10/11/2023 8:14 AM
9561 - Wipe insulator	Instruction	Published	10/10/2023 9:54 PM
9562 - Sweep surfaces with cottom swab, or lint-free cloth soaked in alcohol.	Remark	Published	11/18/2023 3:17 PM
10332 - Continue to sweep and rinse until dust particles no longer appear on the swab...	Remark	Published	11/18/2023 3:18 PM
9593 - 9563 - Inspect for and remove cotton fibers; Remark:9564	Procedure Step	Published	10/11/2023 8:15 AM
9563 - Inspect for and remove cotton fibers	Instruction	Published	10/10/2023 10:01 PM
9564 - Remove cotton fibers deposited in insulator areas using tweezers.	Remark	Published	04/13/2025 6:06 PM
9594 - 9566 - Dry insulators; Remark:9567	Procedure Step	Published	10/11/2023 8:16 AM
9565 - Caution : Heating of the detector tube shall not exceed 100°C.	Annotation	Published	10/10/2023 10:05 PM
9566 - Dry insulators	Instruction	Published	10/10/2023 10:05 PM
9567 - Allow components to air dry.	Remark	Published	10/10/2023 10:06 PM
9595 - 9568 - Clean connector shell; Remark:9569	Procedure Step	Published	10/11/2023 8:16 AM
9568 - Clean connector shell	Instruction	Published	10/10/2023 10:06 PM
9569 - The interior of the narrow-size barrel is the primary contact surface to clea...	Remark	Published	10/10/2023 10:09 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
9597 - 9571 - Confirm O-ring is in place; Remark:9572	Procedure Step	Published	10/11/2023 8:18 AM
9571 - Confirm O-ring is in place	Instruction	Published	10/10/2023 10:10 PM
9572 - No lubrication is necessary.	Remark	Published	10/10/2023 10:12 PM
9598 - 9574 - Reinstall ring insulator; Remark:9575	Procedure Step	Published	04/13/2025 6:15 PM
9574 - Reinstall ring insulator	Instruction	Published	04/13/2025 6:06 PM
9575 - Slide ring insulator over core insulator and high voltage wire lead.	Remark	Published	04/13/2025 6:06 PM
9599 - 9577 - Screw connector shell in place; Remark:9578	Procedure Step	Published	10/11/2023 8:19 AM
9576 - Note : Carefully place threads to avoid cross-threading of shell with the tube wall....	Annotation	Published	10/10/2023 10:17 PM
9577 - Screw connector shell in place	Instruction	Published	10/10/2023 10:17 PM
9578 - Screw connector shell until finger tight.	Remark	Published	04/13/2025 6:05 PM
10331 - 10330 - Test detector tube in an RPM or text fixture when possible; Remark:	Procedure Step	Published	11/18/2023 3:12 PM
10330 - Test detector tube in an RPM or text fixture when possible	Instruction	Published	11/18/2023 3:12 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
hours	Duration	Published	05/26/2022 11:45 AM
Upon neutron detector tube failure	Frequency	Published	10/11/2023 10:33 AM
Caution	Annotation Type	Published	03/02/2020 3:24 PM
Warning	Annotation Type	Published	03/02/2020 3:25 PM
Note	Annotation Type	Published	03/02/2020 3:25 PM
Technician 1	Skill Level	Published	05/14/2020 2:56 PM
Adjustable wrench	Replacement Parts	Published	06/02/2023 10:08 PM
Tweezers	Tools	Published	08/30/2022 4:28 PM
Safety glasses if required	Replacement Parts	Published	06/20/2023 4:47 PM
Neutron Tube SN Location	Image	Published	10/10/2023 4:13 PM
Neutron Tube Serial Number Location	Image	Published	10/10/2023 4:14 PM
Neutron O-ring	Image	Published	10/10/2023 8:30 PM
Neutron Tube Axis	Image	Published	10/10/2023 8:37 PM
Neutron Questionable Insulator	Image	Published	10/10/2023 9:32 PM
Neutron Typical Insulator	Image	Published	10/10/2023 9:34 PM
Wipe Neutron Insulator	Image	Published	10/10/2023 9:56 PM
Neutron Tube Shell	Image	Published	10/10/2023 10:07 PM
Neutron Insulator	Image	Published	10/10/2023 10:14 PM

DET-RPM-RAP-CM29

Clean alumina ceramic insulator on GE Reuter-Stokes proportional neutron counter detector tube. This is performed only when detector tubes are removed from moderator box.

Equipment Hierarchy

Rapiscan VM-250 Vehicle Monitor

Rapiscan PM-700 Pedestrian Monitor

Rapiscan TM-850 Rail Monitor

Frequency

Upon neutron detector tube failure

Technician Level

Технік 1 кат.

x 1

Duration

Time increment

hours

Length of time

Tools Required

Adjustable wrench

Tweezers

Safety glasses if required

Materials Required

Nitrile rubber gloves or lint-free cotton gloves

Isopropyl alcohol

Cotton swab

O-ring (if required) Parker part number is E0515 (-80) size 5-137

Originators

Ron Pawlowski

Originating Organization

PNNL

Approver

Craig Stinson

Safety Concerns

Chemical

Additional Retest Requirements Information

If available, use an RPM or desktop RPM to test the neutron detector.

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

2019-08-01

Version

0.00

Підготовка

Step 1

Main Step

9584 - 9543 - Neutron Tube Serial Number; Remark:

Step 00

9543 - Neutron Tube Serial Number

Neutron Tube Serial Number

9585 - 9544 - Record serial number; Remark:9546

Step 00

9544 - Record serial number

Record serial number

9546 - Only performed on detector tubes removed from the RPM.

Only performed on detector tubes removed from the RPM.

Експлуатація

Step 2

Main Step

10325 - 10324 - Remove MHV Outer Connector Shell; Remark:

Step 00

10324 - Remove MHV Outer Connector Shell

Remove MHV Outer Connector Shell

9586 - 9547 - Remove MHV outer connector shell; Remark:9548

9545 - Caution : Oils from skin may contaminate the insulating surfaces. Either lint-free cott...

Type

Caution

Oils from skin may contaminate the insulating surfaces. Either lint-free cotton gloves or rubber gloves are used at all times during the cleaning process.

9604 - Caution : Avoid tearing or binding the rubber O-ring at the base of the connector shell...

Type

Caution

Avoid tearing or binding the rubber O-ring at the base of the connector shell.

Step 00

9547 - Remove MHV outer connector shell

Remove MHV outer connector shell

9548 - Use adjustable wrench. Loosen and unscrew connector shell.

Use adjustable wrench. Loosen and unscrew connector shell.

9587 - 9549 - Confirm O-ring is positioned above threaded surface and undamaged; Remark:9550

9604 - Caution : Avoid tearing or binding the rubber O-ring at the base of the connector shell...

Type

Caution

Avoid tearing or binding the rubber O-ring at the base of the connector shell.

Step 00

9549 - Confirm O-ring is positioned above threaded surface and undamaged

Confirm O-ring is positioned above threaded surface and undamaged

9550 - The O-ring size is 0.79 mm (0.031 in.) cross section by 19.69 mm (0.775 in.) ...

The O-ring size is 0.79 mm (0.031 in.) cross section by 19.69 mm (0.775 in.) inner diameter. (Parker size 5-137)

Експлуатація

Step 3

Main Step

Do not bend or twist the high voltage wire lead.

Step 00

9551 - Remove Teflon insulator ring from ceramic core insulator

Remove Teflon insulator ring from ceramic core insulator

9552 - Carefully pull Teflon insulator ring along the tube axis

Carefully pull Teflon insulator ring along the tube axis

Експлуатація

Step 4

Main Step

Step 5

Main Step

Use nitrile gloves as sensitive skin may react to the alcohol

9560 - Caution : For quality check, spray alcohol on a piece of clean glass and let evaporate....

Type

Caution

For quality check, spray alcohol on a piece of clean glass and let evaporate. If a film is left on the glass, then the alcohol may have contamination and should be avoided.

Step 00

Heating of the detector tube shall not exceed 100°C.

Step 00

Step 6

Main Step

Do not bend or twist the high voltage wire lead.

Step 00

Carefully place threads to avoid cross-threading of shell with the tube wall.

Step 00

Main Step

Corrective Maintenance Procedure

Percent Complete

100.00

Percent Complete W/Media

100.00