ML20238E898
| ML20238E898 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/09/1987 |
| From: | Nobles L TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 87-11, NUDOCS 8709150279 | |
| Download: ML20238E898 (2) | |
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TENNESSEE VALLEY AUTHORITY Sequoyah Nuclear Plant Post Office. Box 2000-Soddy-Daisy. Tennessee 37379.
September,9,'1987 U.;S'. Nuclear Regulatory 1 Commission
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= Gentlemen:
TENNESSEE; VALLEY. AUTHORITY 'SEQUOYAH NUCLEAR FLANT UNIT 1.- DOCKET NO.
50-327 - FACILITY OPERATING LICENSE DPR-77 -'SPECIAL~~ REPORT 87-11' The enclosed licensee event report provides details concerning1 1
meteorological instrumentation being inoperable for longer than.seven days.
This. event is reported in'accordance with action statement (a) of Limiting Condition for' Operation 3.3'3.4.
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' l Very truly yours,
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TENNESSEE VALLEY AUTHORITY.
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.L. M. Nobles Plant Manager Enclosure cc (Enclosuro):
J. Felson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30323 Records Center Institute of Nuclear Power Operations.
Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia. 30339 NRC Inspectar, Sequoyah Nuclear Plant l
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8709150279 8709(FP PDR ADOCK 050003271 S
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An Equal Opportunity Employer
SPECIAL REPORT 87-11 SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DESCRIPTION OF EVENT On August 21, 1987, at 1500 EST with unit 1 in mode 5 (0 percent power, 3 psig, 130 degrees F) and unit 2 (0 percent power, 345 psig 126 Degrees F) the meteorological instrument for wind direction, was declared inoperable and Limiting Condition for Operation (LCO) 3.3.3.4 was entered, and remained in effect until 0930 EST on August 30, 1987, when the recorder was returned to service. The meteorological instrument was inoperable for approximately nine days and the action statement for LCO 3.3.3.4 requires a special report to be submitted if meteorological instrument is inoperable longer than seven days.
I CAUSE OF EVENT s
This event is caused by a component feilure.
Investigation determined 3that l
green and red pens of recorder 0-XR-90-182 were not inking. The pens,Were' out of adjustment and not touching the chartpaper, although the recorder indicator was working properly. A Work Request (WR) was written to de' pal'r the recorder and the repair work was completed on August 30, 1987.
{J ANALYSIS OF EVENT This special report is being submitted under the requirements of Action l
Statement (a) of LCO 3.3.3.4 as a result of the meteorological instrument being inoperable for approximately nine days. The meteorological tower equipment measures 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 atmosphere. With both units in mode 5 it is unlikely that an accident would have occurred which would have produced a radioactive release.
No unexpected releases occurred during the timeframe the meteorological instrument (wind direction recorder) was inoperable.
Had the plant been in a different operating condition, the significance of this event would not have changed. The meteorological information (printed wind direction charts) could have been obtained from the meteorological station (located approximately one-half mile southwest of the-plant), since the recorder there was operable during this event.
CORRECTIVE ACTION UR B284918 was written to repair the recorder's green and red pens.
It was discovered that the pens were out of adjustment. This was repaired and the recorder was returned to service.
Periodic preventive maintenance is being performed on these instruments; therefore, no further action is planned.
ADDITIONAL INFORMATION There has been two previous special reports written on the meteorological instrumentation being out of service for more than seven days - Special j
Reports 87-03 and 87-04.
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