ML20127L962
| ML20127L962 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 06/30/1969 |
| From: | Gadler S AFFILIATION NOT ASSIGNED |
| To: | Shaper H US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20127L960 | List: |
| References | |
| NUDOCS 9211250316 | |
| Download: ML20127L962 (1) | |
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AUG'18 B69 Mr. Steve J. Gadler 2120 Carter Avenue St. Paul, Minnesota 55108
Dear Mr. Godler:
I as pleased to respond to your let.ter of June M addressed to Mr. Howard Shapar, Assistant General Counsel of the Atomic saargy Commission.
You expressed a concern that the conditions of 10 CFR 20 related to gaseous effluent release st.the Monticello Nuclear Power Flaat probably would not be able to be met _ if high activity during the holdup period, or unfavorabia weather conditions prevailed.. la this regard, the following discussion may help,te clarify what appears to be a misunderstanding of the provisions of 10 CFR 20.
Under the provisions of 10_CFR 20 the affluent from a reacter facility is to be centrolled and limited to such values that.the cumulative whole body radiatism dose to an individual at thelthee-retical point of highest ampesure will not exeeed the limit reeem-mended by FRC and adopted by the AgC.
Irrespective of weather eseditions er gaseous affluent holdup time, an operator of a nuclear power plant is not permitted to exceed' release rates conservatively calculated and specified as mandatory condittees of his 11eemse included to implement this principle.
To translate these requirements into plant operating conditions for each reactor plant, specific limits on rates of radioactive material (curies per second) which may be released from the. stack are derived.
An amaval average release rate limit is established such that the concentration of radteactive gas released under monitored and con-trolled conditions, when averaged over the salender year, will' not result in exposure at any of faite locacion above the specified limit. To account for variations in plant operating characteristic and weather conditions, releases at rates above the average rate a permitted over short periods of time. - Limits are also placed.. hove on the levels to which these ahort tern release rates may so. If " '
release rates above' the average are temporarily experienced, there must be eerresponding periods during which release' rates are below the average, so that the average release rate permitted for the year -
is not aseeeded.
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Form AEC.31e tkev. 9-53) AECM 0240 ee
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Mr. stave J. Sadler.
in developing the permissible annual overage and maximum ehert-tera q
release rate limits in any gives case, the meteorelegical eherselarieties of the site (including layersions and other adverse senditions), the topography of the site environe, and the gaseous heldup ties available in the plant off-gas system are considered. The limits se derived -
become the specified operating conditions within which the plant must operate.
Continuous radiation monitoring of the off-gas system providas the means to demonstrate compliance with the stack release rate limits.
Radiatior. monitors are located before and after the holdup system.
If radiation icvels in excess of the allowable instantaneous release rate were detected ar. alarm would be actuated followed by isolation l
of the off-gas system from the stack. Thus, the high activity radio-active gas would be confined in the holdup system and would not be released to the stack until it could be ensured that the stack release rate limits would not be exceeded. If corrective measures to reduce the activity level could not be made within the time delay period of the holdup system, then under the conditions of the license the plant would need to be shut doen.
Sincerely.-
l Peter A. Morrie, Director Division of Reactor Licensing Distribution:
Docket File j
DR Reading RL Reading AEC Pub. Doc. Room - be t n E l c *00 4 - 4 M ' f " # ' ' N, RPB-1 Reading H. L. Price C. K. Beck M. M. Mann C. L. Henderson P. A. Morris F. Western F. Shapar E. Price V. Schmidt (Retyped at request of P. A. Morris)
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D. R. Muller See attached draft.
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