ML102710558

Special Report for Inoperable Meteorological Monitoring Instrumentation Channel

ML102710558
Person / Time
Site:	Millstone
Issue date:	09/17/2010
From:	Jordan A Dominion Nuclear Connecticut
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
10-553, FOIA/PA-2011-0115
Download: ML102710558 (2)

Text

J Dom."-- ..n.'on Dominion Nuclear Connecticut, Inc.

Millstone Power Station Rope Ferry Road Waterford, CT 06385 SEP 1 7 21010 U.S. Nuclear Regulatory Commission Serial No.10-553 Attn: Document Control Desk MPS Lic: MLC RO Washington, DC 20555-0001 Docket No. 50-423 License No. NPF-49 DOMINION NUCLEAR CONNECTICUT. INC.

MILLSTONE POWER STATION UNIT 3 SPECIAL REPORT FOR INOPERABLE METEOROLOGICAL MONITORING INSTRUMENTATION CHANNEL Pursuant to the reporting requirements of Millstone Power Station Unit 3 (MPS3)

Technical Specification (TS) Section 6.9.2, "Special Reports," Dominion Nuclear Connecticut, Inc. (DNC) hereby submits a special report for the number of operable meteorological monitoring channels less than required by 'Technical Requirements Manual (TRM) Table 3.3.3.4-1. TRM 3.3.3.4 states that with one or more required meteorological monitoring channels inoperable for more than 7 days, prepare and submit a Special Report to the Commission within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel(s) to OPERABLE status.

On September 4, 2010, instrumentation related to wind direction at the 33 foot elevation (WD-33) of the station meteorological tower was declared inoperable when the display reading on the plant process computer was observed behaving erratically. Although the exact cause of this instrument malfunction is currently unknown, instrumentation and control personnel suspect that the failure is unrelated to the instrument damage caused by lightning on August 5, 2010.

Trodubleshooting and repair activities are underway to identify the cause of the malfunction and restore the instrument to operable status. Completion of these activities is contingent on the scope of repairs, availability of parts, and the availability of qualified climbers. The repair actions associated with restoration of WD-33 are a station focus item and are being tracked by DNC's corrective action program.

If you have any questions or require additional information, please contact Mr. William D. Bartron at (860) 444-4301.

Sincerely, A.J.odan Site Vi e President - Millstone

,ýI,

.Serial No.10-553 Special Report for Inoperable Met Tower Instrumentation Page 2 of 2 Attachments: None Commitments made in this letter: None cc: U.S. Nuclear Reguiatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 C. J. Sanders Project Manager U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockvilie Pike Mail Stop 08B3 Rockville, MD 20852-2738 NRC-Senior Resident Inspector Millstone Power Station