United States Nuclear Regulatory Commission - Protecting People and the Environment

U.S. Nuclear Regulatory Commission

Question 44: During 1993, the licensee performed a

prospective dose evaluation, and decided not to measure

internal dose. In 1994, the licensee again evaluates the

internal dose and finds that the threshold for monitoring

is exceeded and begins monitoring. Nothing in the facility

(engineering controls or productivity levels) has changed.

The licensee accounts for the internal dose contribution

when calculating TEDE for 1994. Must the licensee go back

and adjust TEDE for 1993?

Answer: Yes, the licensee must go back and adjust the

TEDE for 1993, based on the best available data. The

information included in the question indicates that the

1993 prospective evaluation was in error and that internal

dose should have been measured; therefore, this error needs

to be corrected. (Reference: 10 CFR 20.1502)

Page Last Reviewed/Updated Thursday, March 29, 2012