ML19309A664
| ML19309A664 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 05/30/1973 |
| From: | Davis E SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8003310572 | |
| Download: ML19309A664 (4) | |
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' AEC DIWRIBUTIO3 FOR PART 50 DOCxzT Mr" RIAL
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CONTROL NO:
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TROM DATE OF DOC:
DATE REC'D LTR MEMO RPr OEGh Sacramento Municipal Utility. Distr Let Cacramento, C&lifornia 15830 Ed Jhvis 5 10-7'4 6-5-7'1 Y
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@ 0P INFO IIEUT NO CYS REC'D DOC;E;T NO:
1 50-312 DESCRIP2 ION:
ENCLOSURES:
1 Ltr re our 5-9-73 1:tr, trans the following:
Rancho Seco Meteorological Data Collection System.
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$SMUD SACRAMENTO MUNICIPAL. UTILITY DISTRICT O 6201 S Street, Box 15830, Sacramento, Califomia 95813; (916) 452-3211 i
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. xx Mr. R. C. DeYoung a hy' Assistant Director for
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Pressurized Water Reactors a
Directorate of Licensing Washington, D. C.
2050 Rancho Seco Nuclear Generating Station No.1 Docket No. 50-312
Dear Mr. DeYoung:
In your letter of May 9, 1973 you expressed your concern over the operational history of the District's meteorological data collection system, citing as an example a recent undetected mal-operation of the system for a period of approximately three months.
You further requested that the District advise you of the cause of the maloperation and the correctiu action we have initiated tc improve system reliability.
The District's response to these items is given in the attachment to this letter.
Sincerely yours,
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(\\M7, E. K. Davis General Manager 1
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3G33 AN ELECTRIC SYSTEM SERVfNG MORE THAN 600.000 IN.THE f f E A R T. 0 F. 0 A l l F O R Ri ! A
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RANCHO SECO METEOROLOGICAL DATA COLLECTION SYSTEM Th'e meteorological data collection system that has been in service since September 1969 is described in Appendix 2B of the Final Safety Analysis Report (FSAR).
Basically, the system provided readings of the following variables at the indicated frequency:
200 Foot Level Frequency Wind Speed 1 minute Wind Direction 1 minute Temperature 1 minute 50 Foot Level Wind Speed 1 second Wind Direction - Horizontal 1 second Wind Direction - Vertical 1 second Sigma Meter,
- Horizontal 1 m;.aute Sigma Meter
- Vertical 1 minute Temperature 1 minute 6 Foot Level Temperature 1 minute Wet Bulb Temperatu,re 1 minute The data was recorded on magnetic tape by a Kennedy recorder and processed off-line on a weekly basis. The data was also logged on a strip chart recorder.
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a System Deficiencies:
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Early in 1977, the District reviewed the meteorological data collection system and identified several. areas in which the system could be improved
'by changes in e uipment and procedures.
s This inveatigation identified the following system deficiencies:
A.
The primary source of data collection was the magnetic tape written by the Kennedy recorder. This in turn, led to the following pro-blems.
(1) The quality of the tape produced was frequently bad because the recorder was unable to provide on-line checking of the records it was writing and the excessive frequency of some of the wind speed data collection shortened the interval between required maintenance.
(2) The built-in delay between the beginning of data collection and the return of a hard copy of the data (normally two weeks) was not amenable to the required rapid detection of equipment problems necessary to insure a high level of data recover-ability.
B.
The process to be used for checking of the data quality had not been defined by a formal procedure.
These difficulties were further compounded the first part of 1973 because the District was in the process of converting to a new computer and the computer services were not always available for timely data processing.
As a result, in a recent case, possible detection of a drif t in the read-ings of the temperature sensors was delayed by the combination of slower than normal turnaround and the absence of a specific procedural check point. This occurred even though the District had requested and was using several suggestions received from its meteorological consultant for data checking.
2.
Revisions to the Meteorological Data Collection System:
The District is making the following extensive revision to the system to improve system reliability:
A.
The Kennedy recorder is being replaced by a Data General NOVA 1200 Minicomputer located in the computer room adjacent to the control room.
The computer will record raw data and hourly averages on magnetic tape verifying the' quality of the records as they are written. The computer will also print out on the teletype and on punched paper tape the hourly average data and on demand will monitor current values. The backup strip chart recorder will be located next to the computer. The l
j computer is scheduled to be operational early in June 1973 with the
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capability of calculating and reporting hourly average data to be added during the first month of operation.
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B.
A complete set of spares has been purchased for the existing equip-ment. All existing equipment has been replaced or rebuilt and calib rated.
C.
Additional sensors are scheduled to be installed before the end of July 1973 to provide redundant measurement of the temperature differen.e between 200 feet and 50 feet (three readings) and the wind speed and direction at 50 feet.
D.
Calibration procedures will be issued to require complete system calibration on a monthly basis.
E.
A procedure has been issued to require a complete qua).ity check of the data on a daily basis. Some of the significant provisions of the procedure are listed below:
l (1) The strip chart recorder will be examined to vurify that all the data is present, the averages for a one hour period agree with the computer, and if the computer is down, all data values are extracted and receit 1 the normal quality check.
(2)
Redundant readings are compared to identify calibration problems.
(3) Temperature difference data is checked for being within a normal range at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> and exhibiting the normal diurnal trend.
(4) Wind speeds and directions are checked by redundancy and agree-ment with the normal range of expected values for comparisons between the 200 foot and the 50 foot levels.
3.
The District will be compiling the hourly average data into monthly summaries on a current basis. Since a meaningful demonstration of com-pliance with Regulatory Guide 1.23 requires a long term demonstration of system reliability, the District will plan on providing a submittal of data collected with the new system in December 1973. Another submittal will be made after the first year of data collection is completed.
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