3315 SEAWAY BLVD 2020-06-05 - Laserfiche WebLink

t A "The receiving room (i.e., Room 133) does not require a lid to provide shielding because the concentration of the radiation exposure reduces due to several factors, one of which is distance. Furthermore,the lid will actually contain the radiation, resulting in an undesirable build-up of radiation within the receiving room; dispersion is preferred and does not result in any negative exposure provided that procedures are followed while the source is exposed. At a certain distance from the source (as indicated in the attached sketch), the exposure is below natural background radiation levels, and therefore no special activity procedures or access restrictions are necessary on the TAT lid or building room. TAT operational procedures will address preventing exposure within the exposure cone when the source is exposed,which will not occur when the general public is present. Such procedures include but are not limited to performing maintenance or other activities that would place persons above a plane measured X-feet off of the finished floor elevation of X feet. Note that the thickness of the walls and shield door are significantly greater than required to provide safe containment of the radiation. For example,the actual required thickness of concrete to provide effective containment is less than 12",versus the 24" provided. The thicker protection has been provided to reduce design time and expedite construction. Documentation substantiating these statements has been previously provided to, reviewed, and approved by the Snohomish County Department of Health; see the attached letter." ,Ii4-477. CELEBRATING Drew Martin, P.E.,S.E. 1 25 Associate Engineer—Commercial Plans Examiner 1 Permit Services YEARS 425.257.8813 1 3200 Cedar Street, 2nd Floor, Everett,WA 98201 A story worth telling everettwa.gov/permits 1 Facebook 1 Twitter Note:Emails and attachments sent to and from the City of Everett are public records and may be subject to disclosure pursuant to the Public Records Act. From: Ben Goodrich <bgoodrich@terrapower.com> Sent:Tuesday, February 5, 2019 2:00 PM To: Drew Martin <dmartin@everettwa.gov> Cc: Nadia Azarova <nadia@craftarchitects.com> Subject: RE: Receiving 133 updated I am on travel but will call Drew right now. Ben From: Drew Martin [mailto:dmartin@everettwa.gov] Sent:Tuesday, February 5, 2019 1:59 PM To: 'Nadia Azarova'<nadia@craftarchitects.com> Cc: Ben Goodrich<bgoodrich@terrapower.com> Subject: RE: Receiving 133 updated Nadia, I haven't been able to reach Ben and would like to close this one out if possible. Please follow up with him about giving me a call to discuss this remaining issue. Thank you. grn. CELEBRATING Drew Martin, P.E.,S.E. 125 Associate Engineer—Commercial Plans Examiner I Permit Services YEARS 425.257.8813 13200 Cedar Street, 2"d Floor, Everett,WA 98201 A story worth telling everettwa.gov/permits I Facebook I Twitter --R