ML20137R868

Suggests NRC Std Condition 70 Be Revised to State Acceptability of Averaging Dose Rate Over 100 Square Cm Area,Per NCRP Rept 33,Section 4.2.2

ML20137R868
Person / Time
Issue date:	08/24/1983
From:	Steven Baggett NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To:	Walker B NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
Shared Package
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References
FRN-50FR30616, RULE-PR-35 AA73-1, NUDOCS 8509230668
Download: ML20137R868 (2)

Text

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f**""';**% UNITED STATES j

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y l'. NUCLEAR REGULATORY COMMisslON g

WASHINGTON, D. C. 20666

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/p MEMORANDUM FOR: Bill Walker, Section Leader ' l Medical Licensing Section N j Material Licensing Branch p

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Division of Fuel Cycle and Material ~ Safety, NMSS

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I FROM: Steven L. Baggett Material Certification and Precedures Branch /,,

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Division of Fuel Cycle and v i Material Safety, NMSS

SUBJECT:

NRC STANDARD CONDITION NO. 70 (

It appears from a recent Agreement State letter (copy enclosed) that the ,

condition does not clearly state that it is acceptable to average the dose l rate over a 100 square centimeter area as defined in NCRP Report 33, i Section 4.2.2. The present Condition 70 A.(1) reads as follows: l C (1) The teletherapy source housing, with the teletherapy i source in the "off" position. The maximum and average  !

radiation levels at one meter from the teletherapy I source in the "off" position shall not exceed 10 milliroentgens per hour and 2 milliroentgens per hour, respectively.

We suggest that you revise the condition to read as follows:

(1) "The teletherapy source housing, with teletherapy source in the 'off' position. The maximum and I average exposure rates at one meter from the source I shall not exceed 10 milliroentgens per hour and 2 l milliroentgens per hour, respectively. However, small areas of reduced protection are acceptable l in evaluating the maximum exposure rate providing i the average over 100 square centimeters at one meter from the source does not exceed 10 milli-roentgens per hour."

Furthermore, we suggest that you change the present standard conditions list to reflect this revision and/or incorporate the change into the revision of Part 35.

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O 8509230668 850906 '

l PDR PR 35 50FH30616 PDR 1

. 's AUG 2 41983 0 -

If you have any questions, please contact me. My phone number is 74240.

yF T;even L. Baggett Material Certification and Procedures Branch Division of fuel Cycle and Material Safety, NMSS

Enclosure:

Agreement State ltr dtd 7/7/83 O

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