NUREG-0209, Further Response to FOIA Request for Five Categories of Documents.Forwards App D Documents.App C & D Documents Also Available in Pdr.Listed Nuregs,Including Facility Fes, Respond to Category 3 of Request Re Plume & Washout Risks

Further Response to FOIA Request for Five Categories of Documents.Forwards App D Documents.App C & D Documents Also Available in Pdr.Listed Nuregs,Including Facility Fes, Respond to Category 3 of Request Re Plume & Washout Risks

ML20212M372
Person / Time
Site:	South Texas
Issue date:	03/04/1987
From:	Grimsley D NRC OFFICE OF ADMINISTRATION (ADM)
To:	Curran D HARMON & WEISS
Shared Package
ML20212M376	List: ML20212M372 NUREG-0209, Further Response to FOIA Request for Five Categories of Documents.Forwards App D Documents.App C & D Documents Also Available in Pdr.Listed Nuregs,Including Facility Fes, Respond to Category 3 of Request Re Plume & Washout Risks
References
FOIA-86-849, RTR-NUREG-0209, RTR-NUREG-209, RTR-NUREG-CR-1171, RTR-NUREG-CR-1244, RTR-NUREG-CR-2326 NUDOCS 8703110410
Download: ML20212M372 (6)

Text

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1. UNITED STATES s -

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- ^t NUCLEAR REGULATORY COMMISSION t

{,  : WASHINGTON, D. C. 20555

. .Y .

• EAR 4 g Diane Curran, Esquire Harmon & Weiss 2001 S Street, NW IN RESPONSE REFER Washington, DC 20009-1125 TO F01A-86-849

Dear Ms. Curran:

This is in further response to your letter dated October 21, 1986, in which you requested, pursuant to the Freedom of Information Act (F0IA),

copies of five categories of records regarding statements made on page 36 of a memorandum from Victor Stello, Jr., to Samuel J. Chilk regarding a report requested by Commissioners Asselstine and Bernthal.

Copies of the records listed on the enclosed Appendix C are already available for public 1_nspection and copying in the NRC's Public Document Room (PDR) located at 1717 H Street, NW, Washington, DC 20555, and can be ]

located by their accession numbers.

Copies of the records listed on the enclosed Appendix D are being placed at this time in the PDR. The records will be filed in folder F01A-86-849 under your name.

With regard to category three of your request, which covers all staff risk assessments involving plume washout, the staff noted that if this were taken literally it appears that every calculation performed by the staff using computer codes that include washout would be included. All consequence computer codes developed for risk analyses since well before the Reactor Safety Study include plume washout models. However, NUREG/CR-1171, " Final Environmental Statement (FES) Related to the Operation of South. Texas Project Units 1 and 2," Dockets 50-498 and 50-499, August 1986, is the latest of about thirty FESS produced by the staff in recent years that include severe accident risk perspectives. It includes many results from the previous FESS. The CRAC computer code, which includes plume rise and washout, was used for the reactor accident risk analyses presented in these FESS. The CRAC code references are:

o CRAC2 Model Description, Sandia National Laboratories, NUREG/CR-2552, March 1984.

o Calculations of Reactor Accident Consequences, Version 2, CRAC2:

Computer Code, Sandia National Laboratories, NUREG/CR-2326, February 1983.

8703110410 8703o4 PDR FOIA CURRAN 86-849 PDR ,

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=Ms. Diane Curran For your.information, the staff further noted that trore germane -to' the thrust of your request, .the sensitivity of consequence results for plume .

rise and washout and numerous other parameters was' investigated.'and reported in'NUREG/CR-4199, "A Demonstration Uncertainty / Sensitivity Analysis Using the Health and Economic Consequence Model.CRAC2, Sandia National Laboratories, May 1985". In this analysis, it'was found that uncertainties in plume washout are'not important contributors to~

uncertainty in risks of fatality or economic consequences, as compared

-to the importance of other variables. This is explained very simply by noting that rainfall is'a relatively rare occurrence, so risk is dominated by dry weather meteorological sequences. Finally, prudent emergency planning includes making dose projections.before postulated events occur, so that unnecessary-time need not be expended during the, especially, early phase of.an accident. NUREG-1062, Dose Calculations for Severe LWR Accident Scenarios, May 1984, contains over 300 graphs of doses and dose rates for various weather conditions. Heats of' release (plume rise), rainfall (washout), wind speeds, source terms (releases) ano stability classes were varied over a wide spectrum for this report.

The' source terms were related to generic severe accident scenarios.

.Thus,-first order dose projections are already available. .This significantly mitigates the problems that could arise in dose projections in tha early phase of an accident. .

If you have further interest in this matter covered by category three of-your request following your review of the referenced reports and comments provided above, please submit another F0IA request for any additional specific records.

The search for additional records subject to your request is continuing. As soon as our search is completed, we will. notify you.

Sincerely, i /?w Y Donnie H. Grimsley, Director Division of Rules and Records

! ' Office of Administration

Enclosures:

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