ML19330C701
| ML19330C701 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/04/1980 |
| From: | Alice Shepard PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19271A963 | List: |
| References | |
| SBN-129, NUDOCS 8008110362 | |
| Download: ML19330C701 (2) | |
Text
PUEBUC SERVICE Companyof New Hampehre SEABROOK STAMON Engineering OfHce:
20 Turnpike Road w:r:::e t., asA oiss1 August 4, 1980 j} c)C)
SBN-129 T.F. B.18.5.4 5
/!/
c o-U.S. Nuclear Regulatory Commission ADDt I
Washington, D.C.
20555 gjggra i Attention:
Mr. Darrell G.
Eisenhut, Director
$4d5 ?Ath I Division of Licensing Office of Nuclear Reactor Regulation Lpp2. + 2DE (y,$ d
.g
Reference:
a)
Construction Permits CPRR-135 E /. 4e T. F800" b (Docket No. 50-443) and g; /,g.),og CPPR-136 (Docket No. 50-444) b)
USNRC Letter to Licensees of Plan ts Under Construction, dated July 2, 19f G e n t l e n. = n :
Submission of Evacuation Time Estimates In preparation of the Seabrook Station FSAR and in answer to the request contained in Reference b), preliminary evacuation analyses have been performed for various areas surrounding the site.
The results of these analyses are hereby submitted and described.
These estimates as well as many matters of emergency planning arrangements for Seabrook Station are preliminary at this time because the detailed considerations to be made and elements to be included in overall plans for the site and surrounding area are not available at t11s stage of station construction.
An element such as the evac-uation analysis methodology identified herein is one of the items tha t will be used for the specification of detailed traffic management and evacuation control measures which are to be established by state and local emergency preparedness personnel.
Because Seabrook emergency plan arrangements are at this prelim-inary stage and because the ultimate NRC and FEMA requirements for operator, state, and local emergency plan contents are not finally established, information on elements such as public notification methods, evacuation confirmation plans, and details about ;pecial institution evacuation considerations cannot be specified now.
As these plans do develop through the remainder of the Seabrook Station construction period, these elements will be developed to address the final emergency preparedness requirements.
800311094[}
U.S. Nuclear Regulatory Ccmmission Page 2 August 4, 1980 We express concern over the review and use of evacuation analyses and their results for the Seabrook Station site.
This concern stems from the fact that public evacuation plans and their time estimates are not the only nor the most important measure of overall public protection from potential accident conditions at Seabrook Station.
This measure comes from the analysis of postulated accident sequences -
analyses which incorporate the mitigating effects of the substantial engineered safety features included in the Seabrook Station design.
These features certainly include the complete secondary containment with a filtered vent for accident conditions.
The results of these accident analyses, when used to gauge items such as evacuation time estimates, offer a more proper measure of public protection than do a review of. the evacuation time estimates alone.
An example using the accident analysis results as a gauge of the evacuation time estimates was described for Seabrook at the construction permit stage of the licensing proceedings.
It was demonstrated that the evacuation time estimates for peak area population conditions, when converted to doses corresponding to the results of the conser-vative case loss of coolant accident analysis, were sufficiently short to prevent any member of the public from exceeding the EPA Protective Action Guides for either whole body or thyroid exposures.
Accident analyses now underway in preparation of the FSAR indicate the results of this type of comparison - evacuation times to radiation doses -
will be even more f avorable than they were at the CP stage.
Because of this we wish to u'Fge caution in'the uninterpreted use of
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the evacuation time estimates themselves.
They should be reviewed
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only together with accident analysis results, which for Seabrook, take into account specific and substantial engineered safety features.
This provides a more direct measure of public protection.
With this expression of concern and caution about the use of the evacuation time estimates, we present the results our analyses have produced to date in the enclosed report.
This report and the applica-tion of the methodology it describes have recently been discussed with state and local emergency preparedness officials and will be considered in their efforts to develop detailed emergency planning arrangements for the Seabrook Station area.
i We trust the supplied information is adequate.
Should any further information be required, please contact us.
Sincerely.
9
/
1
,ygjtts > t - ui4 Arthur M. Shepard JAM /lll Pro.j ec t Manager Enclosure cc:
B.B. Beckley
..H.
Herrin
. Sturgeon G. Thomas W.A. Harvey
.