ML20052A726
| ML20052A726 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 04/26/1982 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-02-02.C, TASK-2-2.C, TASK-RR LSO5-82-04-079, LSO5-82-4-79, NUDOCS 8204290077 | |
| Download: ML20052A726 (4) | |
Text
0 April 26,1982 m
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3 Docket No. 50-213 LS05 04-079 o?S g$B7 77p-9 D
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b Mr. W. G. Counsil, Vice President 8
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Connecticut Yankee Atomic Power Co.
Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
SUBJECT:
SEP TOPIC II-2.C. ATMOSPHERIC TRANSPORT AND DIFFUSION CHARACTERISTICS FOR ACCIDENT ANALYSIS - HADDAM NECK By letter dated January 16, 1979, we provided you our evaluation of SE9 Topic II-2.C for the Haddam Neck facility. Subsequently, by letter dated August 31, 1981 regarding SEP Topic II-l.B you informed us that you have redefined your Low Population Zone (LPZ) distance. Therefore, we have revised our evaluation to reflect the new LPZ distance.
This evaluation will be a basic input to the integrated safety assessment for your facility unless you identify changes needed to reflect the as-builticonditions at your facility.. This assessment may be revitM in the future if your facility design is changed or if NRC criteria relacing to this subject are modified before the integrated assessment is completed.
sEo Y Sincerely,
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Osu usE{o Dennis M. Crutchfield, Chief
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Operating Reactors Branch No. 5 i /
Division of Licensing
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Enclosure:
As stated cc w/entlosure:
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1 Haddam Neck '
Docket No. 50-213 Mr. W. G. Counsil Revised 3/30/82 6
CC Day, Berry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Superintendent Haddam Neck Plant RFD #1' Post Office Box 127E l
East Hampton, Connecticut 06424
. Mr. Richard R. Laudenat Manager, Generation Facilities Licensing I
Northeast Utilities Service Company P. O. Box 270 l
Hartford, Connecticut 06101 i
Board of Selectmen Town Hall Haddam, Connecticut 06103 State of Connecticut 0Ffice of Policy and Management ATTN: Under Secretary Energy Division 80 Washington Street Hartford, Connecticut 06115 U. S. Environmental Protection Agency Region I Office ATTN:
Regional Radiation Representative JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Haddam Neck Nuclear Power Station c/o'U. S. NRC East Haddam Post Office East Haddam, Connecticut 06423 Ronald C. Haynes, Regional Administrator Nuclear Regulatory Commission, Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 9
S_YSTEMATIC EVALUATION PROGRAM l
TOPIC II-2.C HADDAM NECK TOPIC:
II-2.C, Atmospheric Transport and Diffusion Characteristics for Accident Analysis I.
INTRODUCTION 4
The safety objective of this review is to determine the appropriate on-site and near-site atmospheric transport and diffusion characteristics necessary to establish conformance with the 10 CFR Part 100 guidelines.
j In particular, the short-term relative ground-level air concentrations (X/Q) are determined for use in estimating offsite exposures resulting from postulated accidents.
f II.
REVIEW CRITERIA
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Section 100.10 of 10 CFR Part 100, " Reactor Site Criteria," states that meteorological conditions at the site and surrounding area should be con-sidered in determining the acceptability of a site for a power reactor.
III.
RELATED SAFETY TOPICS Topic II-1.A, " Exclusion Area Authority and Control," provides the proper exclusion boundary distance over which the licensee has control.
Various section XV topics utilize the atmosphere dispersion coefficients to deter-mine the offsite radiological consequences of postulated accidents.
IV.
REVIEW GUIDELINES The atmospheric dispersion factors were calculated using the direction dependent method described in Regulatory Guide 1.145, " Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nuclear Power Plants." This model incorporates the results of recent at-mospheric tracer tests, and considers the directionally dependent atmosheric dispersion conditions.
Specifically, the modified dispersion model considers the following effects:
(1) Lateral plume meander, as a function of atmospheric stability wind speed, and distance from the source, during periods of low wind speeds
(<6 meters /sec) and neutral and stable atmospheric conditions.
(2) Exclus on area boundary distance as a function of direction from the pl a n t,
(3) Atmospheric dispersion conditions when the wind is blowing in a specific direction; and (4) The fraction of time that the wind can be expected to blow into each of the 16 compass directions.
v i --
I V.
EVALUATION Relative concentration values for the Haddam Neck facility were originally provided by letter dated January 16, 1979. Since then the licensee has redefined the LPZ distance to be 2.7 miles as reported by letter dated August 31, 1 981 regarding SEP Topic II-1.B, Population Distribution.
Therefore, the staff has recalculated the relative concentration values based on the redefined LPZ distance.
Relative concentration values at the recently revised outer boundary of the low population zone, LPZ, 4344 meters, were calculated using onsite i
meteorological data from January 1975 - December 1976. The data consisted of 10 meter wind speed and direction with vertical temperature difference between 10 and 60 meters for determining atmospheric stability.
The relative concentration values for the EAB remains as originally re-ported in our January 16, 1979 letter for the 530 meter distance.
SHORT-TERM RELATIVE CONCENTRATION VALUES APPLICABLE FOR ACCIDENT ANALYSIS Time Period Location X/0 (sec/ meter 3) 0-2 hours EAB - WNW 8.4 x 10-4 0-8 hours LPZ - W 7.6 x 10-5 8-24 hours LPZ - W 5.4 x 10-5 1-4 days LPZ - W 2.6 x 10-5 4-30 days LPZ - W
- 8. 0 x 10-6 l
VI.
CONCLUSION I
l The staff concludes that the X/Q values presented in Section V are appro-priate for estimating exposures from postulated accidents and should be used in all accident calculations. This completes the evaluation of this topic.
Since this evaluation conforms to current licensing practice, no additional SEP review is required.
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