L-99-019, Special Rept:On 990120,meteorological Tower Wind Speed Sensors Declared Inoperable.Caused by Processor Card for Sensor Locked Up & Needed to Be Reset.Heater That Fit Around Shaft of Sensor Replaced

Special Rept:On 990120,meteorological Tower Wind Speed Sensors Declared Inoperable.Caused by Processor Card for Sensor Locked Up & Needed to Be Reset.Heater That Fit Around Shaft of Sensor Replaced

ML20203D775
Person / Time
Site:	Beaver Valley
Issue date:	02/05/1999
From:	Jain S DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-99-019, L-99-19, NUDOCS 9902160348
Download: ML20203D775 (2)

Text

. - --_ . _ - _

,[ , I g j Beave Valley Power Station Shippingport, PA 15077-0004 i

SUSHIL C. JAIN (412) 393-5512 Senior Vice President Fax (724) 643 8069 Nuclear Services Nuclear Power Division February 5, 1999 l L-99-019 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 l l

i

Subject:

Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 Special Report In accordance with Beaver Valley Power Station (BVPS), Unit No. 2 Technical Specification 3.3.3.4 Action item b and 6.9.2, the following Special Report is submitted for inoperable Meteorological Tower Wind Speed Sensors. This Technical Specification Action item and Administrative Controls Reporting Requirement requires a Special  !

Report be submitted to the Commission within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel to operable status with one or more required meteorological monitoring channels inoperable for more than 7 days.

I Description of Event A routine daily channel check of the wind speed instruments on the BVPS meteorological tower was performed at 0900 on January 20,1999, per BVPS Unit No. 2 Technical Specification 4.3.3.4, Table 4.3-5, Item 1. Both wind speed channels at the 35' elevation were determined to not be adequately functioning and declared inoperable.

Having both the primary and redundant meteorological tower wind speed sensors inoperable does not comply with BVPS Unit No. 2 Technical Specification 3.3.3.4, Table 3.3-8, Item 1.c which requires a minimum of one wind speed instrument operable at the 35' elevation. Both wind speed instruments were returned to service at 1900 on

/

January 27,1999, which exceeded seven days since they were declared inoperable. The []

Technical Specification 3.3.3.4, Table 3.3-8 requirements for wind speed instruments at the 150' and 500' elevation continued to be met.

, q10

/

DELIVERING 9902160348 990205 2

7 0 0 A LITY DR ADOCK 050 ggg y S

3 tMiU4 9

I Beaver Valley Power Station, Unit No. 2 -

Special Report Page 2 l

It is noted that the meteorological tower instruments fulfill the meteorological monitoring requirements for both BVPS Unit No. I and Unit No. 2. Since the BVPS Unit No.1 Technical Specification 3.3.3.4, Table 3.3-8 only requires any three of the six wind speed sensors (at the 35',150' and 500' elevations), the loss of both wind sensors at the 35' elevation did not exceed the BVPS Unit No.1 Technical Specification requirements.

Cause j

l Primary 35 ft. Wind Speed Sensor - An examination was conducted and determined -

that the recent severe weather was not a factor in the sensor's failure. The cause of the problem was that the processor card for this sensor was locked up and needed to be reset.

The processor card was reset, the signal coming from the sensor was verified to be satisfactory and a channel check was successfully performed against the redundant indication after its sensor was repaired.

l Redundant 35 ft. Wind Speed Sensor - This sensor had been failing intermittently due to freezing. The freezing was occurring because the heater that fits around the shaft of the sensor failed. The heater was replaced, the signal coming from the sensor was verified to be satisfactory and a channel check was successfully performed against the primary sensor.

l Corrective Actions Both wind sensor instruments were returned to service on the afternoon of January 27, 1999. The actions taken to retarn these instruments to service are expected to be l effective at maintaining these instruments in operation. No additional actions are planned.

If you have any questions, please contact M. S. Ackerman at (412) 393-5203.

l l Sincerely, Sushil C. Jain

} c: Mr. D. S. Collins, Project Manager i Mr. D. M. Kern, Sr. Resident Inspector

Mr. H. J. Miller, NRC Region I Administrator 4

{

k