ML20127L886

Responds to ,Expressing Concern That Conditions of 10CFR20 Re Gaseous Effluent Release at Plant Would Not Be Met If High Activity During Holdup Period

ML20127L886
Person / Time
Site:	Monticello
Issue date:	08/18/1969
From:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
To:	Gadler S AFFILIATION NOT ASSIGNED
Shared Package
ML20127L868	List: ML20127L864 ML20127L873 ML20127L886 ML20127L897 ML20127L904 ML20127L923 ML20127L928
References
NUDOCS 9211250298
Download: ML20127L886 (2)

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ATOMIC ENERGY COMMISSION

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l AUG 18'1969

!!r. Steve J. Cadler

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St.' Paul,111nnesota 55108

Dear Mr. Cadlor:

I am pleased to_ respond to your letter of June 30 addrosced to Mr. Howard Shapar, Assictant Cencral Counsel of the Atomic Energy j

Cosmiccion.

f You expressed a concern that the conditions of 10 CFR 20 related-l to nascouc cffluent relcano at the Monticello Nuclear Power Plant -

probably vould not be able to bc =ct if high activity during the holdup period, or unfavorabic ucather conditions prevailed. -In:

this regard, the follouing diccuccion may hcip to clarify what i.

appears to be a nisunderstanding of the; provisions of 10 CFR 20.

Uader the provicions of 10 CFR 20 th~c effluent fron a reactor facility in to be controlled cnd lir.ited to cuch valuce that the curulative whole body radiation doso to an individual at the thco -

a retical point of highest expocure vill not excced the limit recon-mended by FRC and adopted by the AEC. : Irrespective of scather conditions or gaseous eff2nent holdup time, an operator of a nucicar l

power plant is not permitted to exceed release rates conservatively calculated and specified as candatory conditions of hio licence included to implement thin principic.

To translate these-rcquirencnts._into plcat operating conditicus for

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cach reactor plant,- specific limits on rates of radioactive matorial'

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(curico por second) uhich may be released from the stack are derived.

An annual average releasa rate 'linit is catablished cuch that the 7

i concentration of radioactive gan relonced under monitored and con-

j trolled conditions, when averaged over the calender year,.will notL J

result. in cuposure at any of fsite location above the specified

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limit. To account' for varictions in plant operating charactorintics sad vaather conditions, releases at ratcs above the' average rate-art-permittod over short periods of time. 1.inics:are-also placed, houcvar, on the levola to which these short term release rates may, go. -. If -

rolcace ratcc above tho average are tc=porarily experienced, _there must be corresponding periods during which rolcace: rates are below '

the averago, so that the average rolcace rate permitted for the year is not, exceeded.~

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.....u Mr. Stovo J. Cadlcr.

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In developing tho 'perminciblo annual overago and am:inum ohort-term relcano rato limits in any given caco, the matcorological characteristics of the cito (including invorciono and other advorno conditiono), tho topography of the oito environo, and the caccous holdup timo available in the plant off-gas cyctea nro concidered. The limito co derived i

becona the opacified operating conditions within uhich the plant r.uct operato.

Continuous-radiatior. conitoring of the off-gas systoa providce the i

sec:.c to demonstrcto conpliance with the ctack rolcace rate limito.

2cdiation conitorn arc located before and after tho holdup system.

If radiation levolc in excene of the allowa'.>lo instantanoons relcaco rate eure detected cr. alars would be cetuated followed by toolation of the off-gan cynton froa the stach. Thus, tho high activity radio-activo gau would to confined in tho holdup cyston and would not be releaacd to the st~ach until it could bo ensured that tho atack relcaua rato lin'inc vould not bo excoaded.

If-correctivo measures to reduco the cctivity level could not be nado uithin the tino dolcy period of the holdup syaten, then under the conditiona of the licenso i

the plant uould noca to ho shut down.

I Sincoroly, Potor A. Morris, Director Division of Reactor Licensing

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