ML20128D294
| ML20128D294 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/04/1992 |
| From: | Fenech R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-90-001, IEB-90-1, NUDOCS 9212070216 | |
| Download: ML20128D294 (3) | |
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l IUA Tennuwe vafy Aunody pow OWs Om MM SMdy Dny. leveee 37379 yyyy Robert A Fenech vec Preaeni seqeyan %c+ar Mani December 4, 1992 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) - NRC BULLETIN 90 LOSS OF FILL-0IL IN TRANSMITTERS MANUFACTURED BY ROSEMOUNT - UPDATED RESPONSE
Reference:
TVA letter to NRC dated July 13, 1990, "Sequoyah Nuclear-Plant (SQN) - NRC Bulletin 90 Loss o.. Fill-Oil in Transmitters Manufactured by Rosemount" The purpose of this letter is to update TVA's response to the subject bulletin.
In the original response, TVA identified 10 Roseaount transmitters that were installed in safety-related systems. At that time, Flow Transmitter 1-FT-3-170 was the only transmitter on the suspect list.
Based upon a review of the_new Addendums 3'and 4 of the master suspect list for Rosemount Models 1153 and 1154, the following additional transmitters have been identified as.being on'the suspect listing (refer to. response 40 of the referenced letter for a brief assessment'of the failure consequences for each of these transmitters):
1.
1-FT-3-142 - Auxiliary Feedwater Turbine Speed Control-2.
2-FT-3-142 - Auxiliary Feedwater Turbine Speed Control 3.
1-FT-3-147 - Loop 3 Auxiliary Feedwater Flow Indication 4.
1-FT-3-155 - Loop 2 Auxiliary Feedwater Flow Indication' Based upon a review of the latest calibration data, these transmitters-are within their calibration band and have not exhibited the symptoms of loss of fill-oil, namely, continual drift'in one direction.
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U.S. Nuclear Regulatory Comission Page 2 December 4, 1992 Flow Transmitter 1-FT-3-155 has shown indications of drift in a single direction over the past.two calibrations. This transmitter is scheduled to be calibrated during the upcoming Unit 1 Cycle 6-refueling outage.
If it exhibits a continued drift in.the same direction as the past, it will be replaced during the Unit 1 Cycle 6 refueling outage. As indicated in our response to requested Action 4b in the above reference, these transmitters continue to be a part of our trending program.
If there are any questions concerning this issue, please telephone W. C. Ludwig at (615) 843-7460. A new commitment is contained in the attached enclosure.
Sincerely, Robert A. Fenech Enclosure cc (Enclosure):
Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North-11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy Tennessee 37379-3624 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite.2900
-Atlanta, Georgia 30323-0199
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ENCLOSURE Conunitment List -
Flow Transmitter 1-FT-3-155 is scheduled for calibration during the Unit 1~ Cycle 6 refueling outage.
If during-the calibration, this transmitter exhibits a continual drifL in the same direction. It will be replaced during the Unit 1 Cycle 6 refueling outage.
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