05000255/FIN-2010004-06
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Finding | |
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| Description | The inspectors identified that the licensees use of dosimeters (TLDs) may not be consistent with the methods used by the NVLAP accreditation process. As a result, the inspectors identified an Unresolved Item (URI) for the apparent non-compliance with 10 CFR 20.1501(c)(2) because the accreditation process for the types of radiation included in the NVLAP program may not approximate the types of radiations for which the individual wearing the dosimeter is monitored. The licensee uses a vendor to supply and process dosimeters used to measure radiation exposure for the monitored workers. This vendor is NVLAP accredited for beta, gamma, neutron, mixture of beta/gamma, and mixture neutron/gamma radiations. However, the licensee uses the dosimeters when workers may be exposed to beta, gamma, and neutron radiations within the same monitoring period. The inspectors determined that this mixture of three radiation types may not be aligned with the accreditation process. The licensee concluded that since the processor was accredited for all three types of radiation, the dosimeter could be used when all three types are encountered during the same monitoring period. During the inspection, the licensee contacted the dosimeter processor for clarification. The licensee indicated that the dosimeter processor makes some assumptions of the types of radiation that the worker was exposed to and selects an appropriate algorithm for processing the dosimeter. These assumptions consider whether the reactor is creating power, therefore creating neutron radiation. The inspectors agreed that workers are not generally exposed to neutron radiation during periods when the reactor is not creating power. However, the licensees program does not require a dosimeter change when the reactor is shut down for maintenance or when the reactor is returned to power. This created a condition where the same dosimeter could be used in a manner that is not consistent with the methods described by the dosimeter processor. The issue remains under review by the NRC pending completion of the licensee\'s testing and evaluation of dosimeters exposed to all three types of radiation. The issue is categorized as a URI pending completion of that revised evaluation and the NRCs review of it (URI 05000255/2010004-06 Use of TLDs May Not Be Consistent With the Methods Used by the NVLAP Accreditation Process). |
| Site: | Palisades  |
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| Report | IR 05000255/2010004 Section 2RS4 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71124.04 |
| Inspectors (proximate) | J Cassidy J Ellegood J Giessner T Taylorc Zoia S Sheldon M Phalen J Lennartz K Walton M Jones T Taylor A Scarbeary E Sanchez-Santiago D Alle |
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Finding - Palisades - IR 05000255/2010004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palisades) @ 2010Q3
Self-Identified List (Palisades)
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