ML20062K737
| ML20062K737 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 12/24/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8012300648 | |
| Download: ML20062K737 (2) | |
Text
- T.
D' 400 Chestnut Street ?>er II December 24, 1980 Mr. Harold P.. Denton, Director
~ :
Office of 111 clear P.enctor Pegulation
.i U.S. Nuclear Pegulatory Ccmnission Washington, DC 20555
Dear Mr. Ecnton:
In the Matter of the
)
Docket Dos. 50-259 Tennessee Valley Authority )
50-2f0 50-296 PFCMPm MOTI?ICATIC1 CF TE WSTIC
'the ::uclear Ecgulatory Cxmission (NPC) and the Fe<'eral mergency Managsent Agency (F3%) have jointly issued radiological emergency plannirs guidance which recuires the installation of a "prcept ratification systs." "he system has a cesign objective of ascuring notification of the public within a 10-mile plume exposure m.ergency zone (CPZ) in the event of an accident at a nuclear power reactor. "he recuirements specify notificatien must be empleted within 15 ninutes fcr the 5-mile EPZ a~' 45 minutes Scr the reainder of the 10-mile CPZ.
Extensive analysis of the accident sequences summari::ed in the Peactor Safety Study, WASH 1400, indicate that the time delay between the start of a major reactor accident and the release of radioactivity to the atmosphere vould range frcri a minimum of 2-3 hours to a naximum of 20 nours. Also, the interval between awareness of i~.pending core damage and the release of radioactivity frce containment is estimated to 'm a minimum of one heur.-
TTA assessments of the probabilities of accidents leading to significant releases and the resulting potential doses to the public in the vicinity of a nuclear facility have deonstrated the need for an autmated notification nystem for areas within the 5-mile EP2. However, beyond the 5-mile EPZ even censervative estimates of potential dose and probability do not warrant a fully autwated notification systcm. Additicnally, assessments presentad to the cammission during the !bvember 18, 1980, UFC meeting en fissien product l
releases during accidents indicate that the nongaseous fission product release l
potential may be much less than has been assumed as the basis for the current l
NRC guidance. SIA assessments indicate that with a reduced release potential for ncngaseous fissien products, many of the post ':hree Mile Island erergency planning requirements may not be justified, including the requirement for the l
10-mile prm pt notification systs. It is our understanding that the ;E
'1 l
staff is now reevaluating the issue of fission product release and its impact on existing and prooosed regulatory guidance. Ce also understand that the cammission, in its review of the recent petition by ruke Power, determined that public notificaticn guidance should be mariified se that 100 percent of.
o
'O the population within 5 miles must be nctified with no specified percentage cut to 10 miles.
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S'r. :!arold R. Centen 4
TVA is ccrntitted to fully cc= ply with the existing recpirer. ente includino i
these regarding the prcmpt notification system. I'nmver, since cur ctm assessments are consistent with the new information on releases presented to the Ccmaission en November 18, 1980, T.% plans to ingle ent insta112tien of a I
prmpt notification systen for Broms Ferry Euclear Plant in the 5-mile EP',
cnly. A cchedule has been established to acceplish the installatien of the 5-i mile systen for operating nuclear plants by July 1,1981. "VA will continue to assist State and lccal authorities in the development and enhance ent of ccnventional notificatica means within the 10-mile F2?. Further, TIA vill proceed with the design of a prmpt notificatien systen for the entire 10-mile r?Z and will irple ent c::pansien cf t'.e 5-ile systen 7.3 apprcpriate upon cmpletion of :IPC's evaluatica of fissien prcduct release potential.
Due to the long 1 cad ti e recuired icr the purchace and installatien cf prcrpt j
nctificatien equipment, ve recpest your ccr ents regarding thic approach by no later than January 15, 1981. By copy of this correspondence FS'A is also inforced of cur plars and requested to provide c r ents to T.%
Very truly yours, TEMES$22: VAUZI IC'EOPTIY j
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d i
L. M. Mills, v ager Muclear e gulation and Safety e
i l
cc:
5'r. Frank A. Camm Associated Director for Plans i
and Preparedness Federal anergency Manager.ent hiency Washington, DC 20472 L
Y h
s
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