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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UNITED STATES j

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NUCLEAR REGULATORY COMMisslON g

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gG 2 4 M MEMORANDUM FOR: Bill Walker, Section Leader j

Medical Licensing Section N

4 Material Licensing Branch Division of Fuel Cycle and p

'i Material ~ Safety, NMSS b[

FROM:

Steven L. Baggett gt Material Certification and

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[V Precedures Branch Division of Fuel Cycle and v

i Material Safety, NMSS

SUBJECT:

NRC STANDARD CONDITION NO. 70

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

condition does not clearly state that it is acceptable to average the dose rate over a 100 square centimeter area as defined in NCRP Report 33, Section 4.2.2.

The present Condition 70 A.(1) reads as follows:

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 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 average exposure rates at one meter from the source shall not exceed 10 milliroentgens per hour and 2 milliroentgens per hour, respectively. However, small areas of reduced protection are acceptable 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.

^ O 8509230668 850906 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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