ML17275B273

Responds to 810922 Request for Description of Type of Radiation Monitors NRC Plans to Install in Svc Area.Nrc Has Established TLD Direct Radiation Monitoring Network at Licensed Facilities.Tld Drawing Encl

ML17275B273
Person / Time
Site:	Columbia
Issue date:	10/02/1981
From:	Wenslawski F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:	Brown R AFFILIATION NOT ASSIGNED
References
NUDOCS 8110070364
Download: ML17275B273 (6)

Text

XRHQZP@coPS Franklin County P.U.D.

P. 0.

Box 2407

Pasco, llashington 99302 Attention:

fir. Rex D. Brown, P.E.

Chief Engineer OCT 2 1981 'gg/f/@

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RECUE@g(I Gentlemen:

Subject:

Description of NRC's Thermoluminescent Dosimeter D) Program In a September 22, 1981 memorandum to Nr.

G. Yuhas of this office you requested a description of the type of radiation monitors that we plan to install in your service ar ea.

The Nuclear Regulatory Commission has established a TLD (thermoluminescent dosimeter) direct radiation monitoring network around various NRC licensed nuclear facilities.

The network is intended to provide information regarding environmental radiation doses resulting from routine and accidental releases from the facility and also independently verify environmental radiation measurements performed by the licensee.

The network consists of two rings of dosimeters placed at 1-2 and 3-5 miles respectively from the site plus additional locations related to population centers and places of high public interest at distances greater than five miles..

He will be placing a TLD network around the Washington Public Power Supply System nuclear generating station.

This network will consist of about thirty such dosimeters.

The basic components of the TLD system are the dosimeter and the holder.

One TLD dosimeter is placed in each holder.

Each dosimeter is about 1

inch wide, 2 inches long and 34 inch thick.

The TLD holder is a plastic cylinder about 2.5 inches in diameter by 6.5 inches long with the main body being a mesh.

The holders have been designed to attach to electrical/

telephone poles via a plastic strap.

It is expected that the dosimeter s will be placed at a height of six to ten feet above ground level.

Each TLD element consists of granular TLD material bonded to a plastic film substrate backed by a carbon film and covered by a teflon window.

The dosimeters furnished utilize lithiumborate activated with copper and silver (Li 840

Cu, Ag) for two elements and calcium sulfate activated with ThullL) ((aS)4.'Tm) for the remaining two elements.

One L148 OT element employs an open window to minimi e attenuation of beta radiation, vhile the other incorporates 280 mg/cm filter.

One of the two CasSO elements in each of the badges is similarly provided with a 280 mg/cm< fTlter, while the second employs a 700 mg/cm2 filter of lead to attenuate low-energy radiation in such a,manner as to compensate for the high response of CaSO in this portion of the spectrum and more closely approximate tissue-equivalence.

Each TLO device is encoded to permit the TLO reader to identify the particular OFFICE/

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When the TLD element is exposed to radiation, electrons within its structure are displaced.

When the TLD element is heated in the reader the displaced electrons return to their original position and photons of light are emitted.

The amount of light emitted is proportioned to the radiation dose.

The TLD and its holder are in no way dangerous.

They are.not radioactive nor contaminated.

Each TLO wi11 be exchanged every three months by -an NRC representative and mailed to'our Region 1 office in King of Prussia, Pennsylvania.

There it will be processed in our reader, the results evaluated, and a report prepared for distribution to state and federal agencies.

If you have any questions about this program or need additional information, please contact Nr. Yuhas at 415-943-3748 or me at 415-943-3757.

Sincerely, Frank A. Wenslawski, Chief Reactor Radiation Protection Section cc; File Docket No. 50<<397 TLD file

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