ML20151X060
| ML20151X060 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/28/1977 |
| From: | Baskin K SOUTHERN CALIFORNIA EDISON CO. |
| To: | Kniel K Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20151X064 | List: |
| References | |
| NUDOCS 8805040044 | |
| Download: ML20151X060 (5) | |
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Southern California Edison Company P. o box 400 224. W ALNUT QRovt AVENUE ROSE WE AD. C ALIFORNI A 917 70 K. P. 8 A S KIN YgLgPHONE
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July 28, 1977 213 sr2 1401 Director of Nuclear Reactor Regulation ATTN:
K. Kniel, Chief Light Water Reactors Branch #2 Division of Project Management U. S. Nuclear Regulatory Commission Washington, D. C.
20555 i
Gentlemen:
Subject:
Docket Nos. 50-206, 50-361 and 50-362 Onshore Tracer Test Program San Onofre Nuclear Generating Station Units 1, 2 and 3 On May 18, 1977 representatives of Southern California Edison Company and our consultants met with members of the Regulatory Staff to present the "Interim Report of the Onchore Tracer Tests Conducted December 1976 Through February 1977 at the San Onofre Nuclear Generating StationY dated April 1977.
That interim report had been informally provided to the staff on May 5, 1977 for their review and comment.
The meeting was held to resolve and incorporate any staff comments into the final report.
This letter forwards the final report entitled "Final Report of the Onshore Tracer Tests Conducted December 1976 Through March 1977 at the San Onofre Nuclear Generating Station", Volumes 1 and 2 dated J une, 197 7.
Volume 1 of the final report describes the program and
'provides results and conclusions from the program. Data from the program and a description of instrumentation and calibrations are presented in Volume 2.
Ihe final report includes information contained in the interim report previously discussed with the Regulatory Staff and, in addition, contains:
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V' ef 8805040044 770728 PDR ADOCK 05000206 P
, T1) Data from seven additional tracer testa performed during March 1977,
'(2) Meteorological data from Masts 1, 2 and 3, as requested by the Regulatory Staff at the May 18, 1977 meeting (See Volume 1, Table 4,1-3),
(3) Discussioa of the consistency of dispersion parameters observed during the tracer tests with a standard Gaussian distribution (See Volu:ae 1, Section 4.4),
(4) Discussion of the comparison of dispersion parameters observed during the tracer tests with standard Pasquill dispersion parameters (See Volume 1. Section 4.5) and (5) Discussion of the use of dispersion parameters determined by the tracer tests as a basis for calculating dispersion factors for design basis accidents and for long-term (routine) releases (See Volume 1. Appendix C).
It is our understanding, based on discussion with the Regulatory Staff at our May 18, 1977 meeting, that the onshore tracer tests are acceptable for the purposes of (1) establishing the suitability of utilizing the bluff tower data to predict meteorological dispersion parameters for the San Onofre site and (2) establishing specific factors of conservatism inherent in utilization of bluff tower data in predicting such meteorological dispersion parameters. As discussed in Appendix C of Volume 1 of the final report, the tracer teste demonstrate that the concentration of radioactive release at the minimum exclusion distance for postulated accidents at San Onofre Unit 1 would be apgroxi-mately 4 times lower than previously reported on the Unit 1 docket and 15 times lower than the value conservatively established by Regulatory Guide 1.4; the concentration for postulated accidents at Units 2 and 3 would be approximately 7 times lower than previously reported on the Units 2 and 3 dockets.2 Amendments to all dockets which reflect meteorology and dose calculations which include consideration of the results of the tracer tests will be submitted in the near future.
In
, addition, in accordance with the enclosure to our letter to the Commission dated April 21, 1976 in Docket No. 50-206, a proposed change to Technical Specification 4.3 "Containment Testing", reflecting use of site specific
. meteorological data rather than meteorological assumptions based on Regulatory Guide 1.4 to determine the allowable containment leakage for San Onofre Unit 1, will also be submitted in the near future.
1 Amendment No. 52 to Final Safety Analysis, San Onofre Nuclear Generating Station, Unit I submitted by letter dated December 3,1975.
2 Final Safety Analysis Report, San Onofre Nuclear Generating Station, Unita 2 and 3.
Sixty-three (63) copies of Volume 1 and seven (7) copies of Volume 2 of the final report are being provided under separate cover.
A data tape of meteorological data collected during the period December 20, 1976 through March 29, 1977 at the bluff and inland towers is also being provided under separate cover.
As requested by the Regulatory Staff at our Na, 18, 1977 meeting, the data tape includes data collected at the bluff ard inland towers during periods when tracer was not being released. The data tape format is provided as the attachment to this letter.
If you have any questions concerning this matter please let me know.
Very truly yours, f} 04L;thMl}h Enclosures cc: Mr. Albert Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors U. S. Nuclear Regulatory Commission Jack B. Moore, SCE 4
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DATA TAPE FORMAT This tape contains two files; the first file contains data measured at the Bluff tower; the second file contains data measured at the Inland tower.
The format of this tape is as follows:
9 Track 800 BPI Odd Parity Card Image (record length is 80 charactero; one record per block; 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> per record)
EBCDIC Each record (one hour) is recorded as follows:
Columns Variable Description 1-3 JDAY Julian day 4-5 IHR Hour at the beginning of the average (PST) 7-11 WS10 10 m wind speed (mph) 12-16 WD10 10 m wind direction (degrees or meteorological sectors) 27-31 WS40 40 m vind speed (mph) 32-36 WD40 40 m wind direction (degrees or meteorological i
sectors) 42-46 DTP Primary delta temperature measured between 10 meters and 40 meters (OC).
63 IWD10 If = T, 10 m wind direction is from digital system and units are degrees (bluff only):
If = C, 10 m wind direction is from strip chart and units are meteorological sectors (0-16, 0 - calm, 1 = NNE).
.2-e Columns
_ Variable Description e
67 IWD40 Same as IWD10, except for 40 m wind direction.
73-74 IYR Year Invalid observations are indicated by all nines in the field.
Wind speed and direction measured at the 10 meter and 40 meter levels and the primary delta temperature measured between the 10 meter and 40 meter levels are the only meteorological parameters provided.
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