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Radiological Safety and Response RPT-243-PE-4. Posting. Learning Outcomes Upon completion of this lesson, the student will be able to (cont’d): .
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Radiological Safety and Response RPT-243-PE-4 Posting
Learning OutcomesUpon completion of this lesson, the student will be able to (cont’d): • Post any radiologically controlled area in accordance with the regulations when provided survey information, radiological profile information, posting material and local guidance. • Describe precautions and survey techniques for entering an area where radiation levels are unknown. • Demonstrate actions that should be taken if radiological conditions significantly different from those indicated by the posting.
Outline • Explanation • Mini-Lecture and Demo for Posting Techniques • Section 1 – COP Surveillance • Section 2 – Posting Construction and Placement • Debrief
Explanation • The same team assignments made in PE-1 will continue into this PE. • The teams will be sub-divided into two person sub-teams. • This PE has two sections. • The first section involves the teams performing a surveillance under the Compliance Observation Program (COP). • The second section involves the teams demonstrating the ability to construct and place a barrier rope with posting in place.
Explanation • The teams will be held accountable for the use of proper three-part communication and human performance tools during the PE. • The exercise will start with a mini-lecture on proper posting techniques and will include a pre-job briefing for the scenario. • At the conclusion of the practical portion, a team debrief may be held if time permits.
In General… • Each station issues procedures that describe the details of their posting standards. • In many cases, the local standard is more conservative than the regulatory requirements. • For example: • The standard for regulations in posting a radiation area is 5 mrem/hr general area dose rates. • The local standard may be that radiation areas are posted at 2.5 mrem/hr.
In General… • The regulations say the words “Caution” and “Radiation Area” are to be used. • The station may require additional wording such as “RWP Required for Entry” and “Dosimetry Required for Entry” • “Notify HP Prior to Entry” may be another locally imposed posting required.
In General… • Colored inserts may also be used to enable differentiation of hazards on a common posting sign. • Unique shapes may be specified such as a triangle shaped sign for Locked High Radiation Areas • Other techniques may be stipulated through training, department policy or “standing orders” such as: • the need to secure the ends of a rope using a specific technique.
In General… • The need to tape or otherwise secure inserts in the holder • The requirement to place entry barriers for radiological areas without step-off pads (SOPs) at a height of five feet secured on both ends • The requirement to place barrier rope at SOPs secured at one end with a hooking device on the other • The requirement that signs not be placed on doors that might be blocked open unless a back-up barrier is erected.
The ATC-RPT Standard • For the purposes of our PEs, the posting standards that will be used are shown in the following pictures and as described here: • Every posted area will have the wording “Caution” “Radioactive Materials Area” • Multiple hazards may be represented on the same sign with dose rate based information shown first followed by airborne based posting and then contamination based posting. • Contact HP (RP) Prior to Entry is required on all posing signs at the bottom
The ATC-RPT Standard • Radiological Buffers Zones (RBZ) have unique postings not addressed in the regulations. • Some power facilities use them, some do not. The DOE sites typically use either an RBZ or Radiological Buffer Area (RBA) • We will use the RBA prior to an individual entering an RCA.
The ATC-RPT Standard • Barriers are treated one of two ways: • An invisible plane that must not be broken • Wet paint theory – reaching across is okay – just don’t touch anything. • We will use the invisible plane theory • Do not break the plane created by the barrier or the tape on the floor. • Radioactive tape is also used specifically in applications concerning loose surface contamination. It defines the intersection of the plane with the floor
The ATC-RPT Standard • Areas with SOPs will have provision made for the barrier to be temporarily disconnected to permit access and egress. In this case, the barrier is to be approximately waist level. • Barriers at areas without SOPs are to be secured on both ends with the barrier rope at a height of five feet. • The ends of all rope barriers are to be secured using tie-wraps and a double overlap of the end.
The Technique The “bitter end” Trim off excess unraveled pieces
The Technique The first loop. About two inches between ty-wraps
The Technique The second loop. Notice the two new tie-wraps are between the first two tie-wraps
The Technique Trim it up. The tie-wraps as close as possible. Up the side cutters to cut the excess rope as close as possible.
The ATC-RPT Standard • Any area with radiological readings > 80% of the threshold for the next level of posting should have the posting upgraded to the next level as a precaution. For example: • The general area dose rates in a posted High Radiation Area are found to be 800 mr/hr. The area should be upgraded to a LHRA. • The RPT would do this after consulting with an RP Supervisor.
Scenario PJB • Your team is assigned to participate in a routine surveillance conducted in accordance with the station’s Compliance Observation Program (COP). • Each team is assigned specific postings to inspect. • Each team is given a current survey to use as the standard for the posting observation. • Each four man team will be sub-divided into two person sub-teams. • Standard radiological safety guidelines apply. • Industrial safety standards also apply. Adhere to all postings.
Scenario PJB • The task is to check the posting in place to ensure it matches the radiological conditions presented by the survey data. • Your RWP number is RWP-201X-243 task 4. • The team members are to adhere to all RWP requirements and posting. • The team members are to perform the task in a manner in which dose is equalized between the team members.
Scenario PJB • The teams are to adhere to the instructions given in the Student Guide. • Discrepancies are to be communicated to the Instructor and actions taken as directed. • Questions
Instructions • Timed • Follow the Student Guide as a procedure.
Scenario Set-Up • When using the side-cutters on the tie-wraps or the rope, use caution to avoid sharp edges and the pinch point. • Using the information and materials provided, construct and install a barrier and posting in accordance with the local guidance and regulatory requirements.
Instructions • Follow the Student Guide as your procedure. • After finishing Section 2, complete the student guide as a team and return it to the Instructor.