[powernet] RE: Benchmark Response Request Question #1 of 2

1.We went to annual for 2017, but then we are in permanent shutdown. 2.Not yet, but we expect it. A little data mining of the electronic dosimeter data for previous periods should be able to provide an estimate. 3.Landauer OSLN 4.10 mrem 5.Right now, if you are a radworker

[powernet] Canberra iPix

Looking for someone with some hands-on experience with the Canberra iPix. David Brehm Sr. Radiological Engineer Radiation Protection - Fort Calhoun Station Omaha Public Power District 9610 Power Lane, Blair, NE 68008 Office: 402.533.7582 Cellular: 402.237.9840 dmbr...@oppd.com ---

[powernet] Shepherd Irradiators

OPPD - Fort Calhoun has a Shepherd Model 89 and a Shepherd Mini 89 that are no longer in use. We are seeking a new home for them. They are both in operational condition. Both units have Cs-137 sources. The larger source (~ 200 Ci) in the Model 89 is required to be tracked in the National So

[powernet] RE: Internal Sensitivity Study on Beta WB Contamination Monitors

Yea...they did ask us to do that. Not surprisingly, a gas-proportional (Argos 5 A/B in our case) has very poor gamma sensitivity - the specification sheets indicate < 1% gamma efficiency. It took about 3,000 nCi of Cs137 (equivalent to around 10 ALI of our mix) to get it to alarm 10/10 times.

[powernet] RE: Count Room MCA Calibration

1.Yes 2.We use the Mirion/Canberra Apex Gamma with LabSOCS characterized detectors. For the mathematical efficiency calibrations, we perform an annual verification count to ensure that the characterization is still valid. Any empirically derived efficiency calibrations are performed a

[powernet] RE: Count Room MCA Calibration

houn Station Omaha Public Power District 9610 Power Lane, Blair, NE 68008 Office: 402.533.7582 Cellular: 402.237.9840 dmbr...@oppd.com<mailto:dmbr...@oppd.com> From: Vickers, Glen:(GenCo-Nuc) [mailto:glen.vick...@exeloncorp.com] Sent: Thursday, August 24, 2017 7:09 AM To: BREHM, DAVID M ; &#

[powernet] RE: Had a question on TEMs, SAM 11/12

Get a large magnetic field too close to the PMT and the count rate will likely go to zero on that detector. Seen this with PMT based instruments near large magnetic fields (e.g., heavy equipment hydraulic rams, large vehicle alternators, large magnets, etc.) Suggest testing this with the magne

[powernet] RE: DMC-2000 Question

At one time or another, we’ve had most of the problems listed. The biggest fix was switching to the LDM-250. That prevented the folks from taking the dosimeter in the middle of writing to the dosimeter. Far fewer issues since doing that. Failing the LDM-250, coach folks to take their hands o

Re: [Powernet] PAPR Usage

For the most part, Fort Calhoun Station uses the MaxAir PAPR hood (we get them via UniTech). No cross-contamination issues that I can recall. David Brehm Sr. Radiological Engineer Radiation Protection – Fort Calhoun Station Omaha Public Power District FC-3-1 9610 Power Lane, Blair, NE 68008 Offi

Re: [Powernet] Alpha Determination

Generally, we use an alpha-only instrument operating on the alpha voltage plateau. That way there is essentially no beta interference - the precise quantifying of which, for a calculated compensation, is tricky & very instrument and radionuclide mix dependent. The detector type will determine

[Powernet] Monitoring During Dry-Fuel Campaign Cask/Fuel Drying Activities

All, I'm looking for any actual or planned radiological monitoring during cask/fuel drying operations. In particular, monitoring of the gas flow path from the cask to the installed building exhaust plenum(s). The object of this exercise is to ensure that we have sufficient data to accurately

Re: [Powernet] Question about a Declared Pregnant Worker

We did. Much discussion on the very issues you mention. The individual wound up working in another non-shift position that also required a licensed operator. David Brehm Sr. Radiological Engineer Radiation Protection - Fort Calhoun Station Omaha Public Power District FC-3-1 9610 Power Lane, Bla

Re: [Powernet] Count Room Questions

I’d be reluctant to put in a procedure hard limits. A guideline or documented expectation does seem prudent to ensure that someone does not do something that would result in an area posting change without some prior thought/planning. While rare (in my experience) it does happen that particularl

Re: [Powernet] RP field instrument tamper seals

Fort Calhoun Station does not use tamper seals. Our near zero instance of as-found our of calibration (excluding broken instruments), indicates that staff are not messing with the instruments. [OPPD logo] David Brehm Sr. Radiological Engineer Radiation Protection - Fort Calhoun Station Omaha Pu

Re: [Powernet] Is there a need for a portable beta spectrometer and/or a real time beta CAM with spec capability ?

I find the concept intriguing, but not sure how useful it would be for most field applications. If, for example, you had a radionuclide mix that varied, it would be handy. Particularly if you are operating with low-level airborne activity. For us, we determine either a weighted average energy

Re: [Powernet] WBC questions need answers.

1.We calibrate & maintain the whole body counters (Canberra/Mirion Fastscan and AccuScan II) in house. We've kept the calibration of all our spectrometers within the RP group and have been able to maintain the expertise to do so. Assuming that you have individuals with the interest, backgro