ML20214J022
| ML20214J022 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/21/1987 |
| From: | Nobles L TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 87-04, 87-4, NUDOCS 8705270597 | |
| Download: ML20214J022 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY I
Sequoyah Nuclear Plant Post Office Box 2000 Soddy-Daisy, Tennessee-37379-May 21,=1987
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2 U. S. Nuclear Regulatory Connaission
- Document Control Desk.
Washington, DC 20555 Gentlemen:
- TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT UNIT 1 - DOCKET NO.
'50-327 - FACILITY OPERATING LICENSE DPR SPECIAL REPORT 87-04 The enclosed special' report provides details concerning-the meteorological instrumentation being inoperable greater.than seven days due to an unknown component failure. This event is reported in accordance with 10 CFR 50.73, paragraph a.2.i'.
Very truly yours,
' TENNESSEE VALLEY AUTHORITY
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-[L.M. Nobles 1.
Plant Manager
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Enclosure cc (Enclosure):
J._ Nelson Grace, Regional Administrator
- U. S. Nuclear Regulatory Connaission Suite 2900 101 Marietta Street, NW Atlanta, Georgia' 30323 Records Center Institute of Nuclear Power Operations l
Suite 1500.
1100 Circle 75 Parkway
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Atlanta, Georgia 30339 NRC Inspector, Sequoyah Nuclear Plant l
8705270597 870521 PDR ADOCK 05000327 S
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1983-TVA 50rH ANNIVERSARY
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' An Equal Opportunity Employer
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SPECIAL REPORT 87-04 SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DESCRIPTION OF EVENT
'On May 2, 1987, at 1750 EST with both units in mode 5 (0. percent power, 337 psig, 120 degrees F and 0 percent power, 260 psig, 129 degrees F.
respectively), the meteorological instrumentation was declared inoperable, and Limiting Condition for Operation (LCO) 3.3.3.4.was entered. At present l
(May 19, 1987), the' meteorological instrumentation has not been returned to i
service. The Instrument Nechanics have been investigating the problem and have yet to determine the cause of this event.
LCO 3.3.3.4, action statement (a), requires a special report to be written if the
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meteorological instrumentation is out longer than seven days. The LCO will be complied with until-the instrumentation is returned to service.
CAUSE OF EVENT This event is still under investigation. Instrument Maintenance has indicated that a component failure somewhere in the Auxiliary Relay Rack 0-R-110 may have caused this problem. However, the exact component has not i
been located. Upon completion of the investigation and correction of the.
j problem, this special report will be revised to detail the results, f
ANALYSIS OF EVENT This event is being reported under the requirements of action statement (a) of LCO 3.3.3.4.
The meteorological tower equipment measures the wind direction, wind speed, and air temperature. These parameters are used to determine plume conditions in the event of an unexpected radioactive release to the environment. With both units in mode 5, it.is highly f
unlikely that such' an accident could occur. Also, the meteorological data could be obtained from meteorological tower since the computer has been 1
operable during this event. Had the plant been in a different operating condition, the significance of this event would be unchanged since the meteorological information is used to monitor an accident.~ It is not used to assist in mitigating an accident. The health and safety of the public j
is not endangered by this event.
CORRECTIVE ACTIONS 1-No corrective actions have yet transpired.
Instrument Maintenance is working diligently to correct this problem. This report will be revised by August 7, 1987, detailing the corrective action taken to return the meteorological instrumentation to an operable status.
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ADDITIONAL INFORMATION There has been one previous special report written on the meteorological instrumentation being out of service more than seven days - Special Report 87-03.
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