ML20204H986
| ML20204H986 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 08/04/1986 |
| From: | Baer R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Ronald Bellamy, Dan Collins, Shafer W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20204H991 | List: |
| References | |
| NUDOCS 8608080275 | |
| Download: ML20204H986 (4) | |
Text
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UNITED STATES f
NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 t
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AUG 4 1986 h
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MEMORANDUM FOR:
Ronald R. Bellamy, Chief, EPRB, RI Douglas M. Collins, Chief, EPRB, RII Wayne D. Shafer, Chief EPRB, RIII William Fisher, Chief, RSPB, RIV Frank A. Wenslawski, Chief, EPRB, RV FROM:
Robert L. Baer, Chief Engineering and Generic Communications Branch Division of Emergency Preparedness and Engineering Response Office of Inspection and Enforcement
SUBJECT:
DIGITAL ALARM 00SIMETER NON-LINEARITY In May, 1986 Region I reported the Pilgrim facility had experienced non-linearity problems with a digital alarm dosimeter used in very high radiation fields (see enclosure 1 Dositec general description). According to the licensee, their testing showed linearity only up to 9R/hr. At 24R/hr the dosimeter showed an underresponse of about 35%. The licensee believes this exhibited non-linearity at these dose rates was contrary to the vendor's literature (see enclosure 2). EGCB contacted the vendor who requested a meeting with EGCB in NRC headquarters.
As a result of our subsequent meeting in late May, the vendor agreed to clarify Additionally, the vendor promptly dispatched his open literature advertising.
j to all customers by certified mail a user-warning letter and an updated speci-l fication sheet which better highlights the linearity limitations of this dosimeter (see enclosure 3). Note that three slightly different information packages were dispatched, one for each modified version of the dosimeter.
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Contact:
Jim Wigginton, IE 492-4967
. Multiple Addressees Since the vendor appears to have effectively clarified the linearity charac-teristics of the dosimeter and notified all end-users, IE plans no further generic action on this matter.
If you have.any questions on this issue, contact Jim Wigginton of my staff.
Robert L. Baer, Chief Engineering and Generic Communications Branch Division of Emergency Preparedness and Engineering Response Office of Inspection and Enforcement
Enclosures:
As stated DISTRIBUTION JMTaylor ELJordan SASchwartz RLBaer JEWigginton RLPedersen JGPartlow BKGrimes RHeishman LJCunningham GSJoblom SSHsu EWBrach, E00 DCS DEPER R/F EGCB R/F
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DIGITAL ALARM DOSIMETER GENERAL CESCRIPTION
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The DOS-502A rkusitec Digital Alarm Dosimeters provide digital readings of accumulated radiation exposure, a preset *.able and resettable constant alarm warning signal, and an optional chirper. These are the most reliable solid state personal digital alarm dosimeters available. They do not have the problems of high voltage, gas leakage, large size, and' sensitivity to j bregk,, lown._iA Aish_rgdiation cields, which are known to occur in the conventional type of Geiger tube dosimeters. They are small, light, and l
rugged pocket-size dosimeters.
The Dositec Digital Alarm Dosimeter has a unique Battery Test feature.
Pushing the sattery Test Switch causes the Battery Test LED lamp to light if the battery is still functioning odequately, indicating that the Dositec,'
Digital AlarTn Dosimeter wili functicn accurately for at least 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> longer, even though the Battery Test LED lamp might fail to light during this 12-hour period.
A presectable and resettable continuous aloem is available. This alarm can be presat at any level of accumulated exposure from 0 to 9999 mR, providing an audible warning when the preset level is reached. The user can also reset the alarm and the dostmetor will provide this constant alarm again when the preset alarm point is reached once more.
E The accumulation and disp 15f of the integrated exposure levels are completely independent of the operation of the alarm. For example, if the alarm is E
preset at 12 mR and is rone: after the alarm sounds, it will sound again af ter astadditional 12 mR. The display would then show total exposure of 24 a The Chirper Option, if chosen, gives one charp per mR. This optional chirper E
provides radiation rate; i.e.,
the faster it chirps, the higher the radiatior field.
The Dosttec Digital Alarm Dosimeters may be calibrated by the users if destra The calibration is quite simple and the calibration method is included in the Tporating end Calibration Instruct. tons section in thin manual.
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1800643-8138 or 1401-2N-7191
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