ML19249E509
| ML19249E509 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 05/30/1978 |
| From: | Markee E Office of Nuclear Reactor Regulation |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910010615 | |
| Download: ML19249E509 (6) | |
Text
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timY 3 0 't378 Dochet Nos.
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and 50 ME:10?ANDU'l FOR: John F. Stolz, Chief Li?,ht Uater Reactora tranch #1, DP:t
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FR0't:
Earl H. Parkee, Jr., Leader, :icteorology Section Hydrology-Meteorology Eranch, DSE SU3 JECT:
ICTF020 LOGICAL ACCEPT.CICE PJNI!210F FSIR FO'1 C:E;D CULF PI.Y;T N.Y4E: Grand Gulf j
LIClGSIEG STAGE: OL i
DOCKET IPJ'9ER:
50-416-417 RESP 03SIELE ESU!CU:
L',"1 #1 REQUESTED C0;tPLETION DATE: l'ay 22, 19 73 REVIDI STNrUS: Meteorology Section (EDID) - Avaiting ?csynse The t'ctc >rology Section has revimicd the FSAR for Crand Gulf and, finding it 95% complete, recoutand that it be accepted.
Unclosed are questions that have been developed by W. Snell and if J
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draft Q-l's.
JJ, d c; Questions 372.01, 372.02, 372.03, 372 04, 372.05, 372.05, 372.07 and 372.09 have also been provided for the ER review sinca the caterini contained in the sections referenced is sintinr. W reco rend that the applicant bo informed of these duplicato questions, nad that the suggestion be made that either duplicate or ca,cs referenced responses i
are acceptabic.
Origit.al SI ned by E
Ja esE.Fairobent 4
Earl H. "arkce, Jr., Leader Meteorology Section Hydrology-Heteorology Branch Division of Site Safety c.nd i
Enviroamental Analysin
Enclosure:
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As stated
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NRC fop 31318 (9 76) NRC.%f 0240 U u.s.oovt u vr ramtm s orrice is7s
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2.3 Meteorology 95% Complete 2.3.1 Regional Climatology 372.01 Discuss the tornado that passed through the site area on (2.3.1)
April 17,19 78.
Include meteorological information (e.g.,
peak gusts, wind shif ts, pressure drop) and copies of analog traces obtained from all levels of the onsite tower along with l
I estimates of tornado path width, length and intensity.
372.02 Estimate the probability of a lightning strike and recurrence (2.3.1) interval on the plant structures.
(See for example, " Electrical Protection Guide for Land-Based Radio Facilities" by D. Bodle, 1971, (JES-159-3-3M 3/76), Joslyn Electronic Systems, or,
" Lightning Protection" by J. L. Marshall,1973, John Wiley
& Sons, Inc.)
2.3.2 Local Meteorology 90% Complete 372.03 The three years of onsite data (8/72-7/74, 1/76-12/76) at (2.3.2) the Grand Gulf site indicate a much lower percentage (.02-
.1%) of calm windspeeds (which should be defined as wind speeds less than the starting speed of the anemometer) than would be expected for this region. Discuss the reasons for this low percentage of calm winds.
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. 2.3.3 Onsite Meteorological Measurements Program 80% Complete 372.04 Provide monthly summaries of the meteorological data obtained (2.3.3) from the two temporary meteorological towers and compare these summaries with the data from the 162-f t permanent tower.
Discuss also the "ef fects of the hills along the castern shoreline" (FSAR, p. 2.3-32) through analysis of data from the temporary river tower.
372.05 Provide a description of the area where the 162-ft meteorological l
(2. 3. 3) tower is located.
Include in the discussion such information as distances to the nearest bluf fs and trees, their heights above the base of the tower, and a description of the ground surrounding the tower (i.e., is it grass, soil, etc.),
372.06 Describe the inspection, maintenance and calibration procedures (2. 3. 3) for the onsite ret eorological instrumentation and their frequencies.
372.07 Discuss the methodology by which calms are determined from the (2. 3. 3) onsite wind data.
2.3.4 Short-Term (Accident) Dif fusion Estimates 95% Complete 372.08 NRC has developed a new short-term (accident) diffusion model (2.3.4) that takes into consideration horizontal plume meander, the direction dependency of wind, and the actaal exclusion area i
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boundaries. Enclosed is draft Regulatory Guide 1.XXX
" Atmospheric Dispersion Models for Potential Accident Conse-quence Assessments at Nuclear Power Plants," (9/23/77) which explains this new model.
The staf f considers that this new model will provide a more realistic evaluation of atmospheric diffusion conditions than the approach found in Standard Review Plan Section 2.3.4, and I
have determined that the new model would be appropriate for use in evaluating the Grand Gulf site. The model was approved for interim use by the Regulatory Requirements Review Committee on Iby 2, 1978.
A copy of this interim branch technical position has been enclos<t.
In either case, provide the 16 exclusion area boundary distances for the Gran Gulf site.
2.3.5 Long-Term (Routine) Diffusion Esticates 95% Complete 372.09 Discuss why terrain recirculation factors were not considered (2.3.3) for the long-term diffusion rnalysis.
3.3 Wind and Tornado Loadings 3.3.1 Wind Loadings 100% Complete 3.3.2 Tornado Loadings l
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,n INTERIM BRANCH TECHNICAL POSITION HYDROLOGY-METEOROLOGY BRANCH ACCIDENT METEOROLOGY MODEL It is our position that either the draft Regulatory Guide 1.XXX,
" Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nuclear Power Plants" (dated September 28, 1977),
i or the procedures described in Standard Review Plan Section 2.3.4 may be used to evaluate atmospheric transport conditions for analysis of accidents with the following amendments to the dra:it regulatory guide model:
(a) the accumulated frequency of the limi-f ug sector X/Q value in all sectors may not exceed 57. for the <2te, and; (b) normalization of individual sector prcbability distributions is not used.
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