TXX-4364, Deficiency & Part 21 Rept SDAR-156 Re Rosemount Transmitters W/Potential Leakage Path Between Sensor Module & Housing. Instruments Removed & Will Be Installed Prior to Plant Operation
| ML20100B856 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/19/1984 |
| From: | Clements B TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Hunter D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| SDAR-153, TXX-4364, NUDOCS 8412050162 | |
| Download: ML20100B856 (2) | |
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TEXAS UTILITIES GENERATING COMPANY MKYWAY TOWER
- 400 NORTH OLIVE MTHEET, L.H. R1
- DALLAM, TEXAN 73301
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Novamber 19, 1984 TXX-4364 Mr. D.R. Hunter, Chief Reactor Project Branch 2
'U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket No.:
50-445 Arlington, TX 76012 50-446 COMP.NCHE PEAK STEAM ELECTRIC STATION ROSEMOUNT TRANSMITTERS
' QA FILE: CP-84-28, SDAR-153 FILE N0.:
10110
Dear Mr. Hunter:
In accordance with 10CFR50.55(e), we are submitting the enclosed report of actions taken to correct a deficiency regarding transmitters which could have 'a potential leakage path between the sensor module and housing which could cause the transmitters to be inoperable. We have submitted an interim report logged TXX-4334 dated October 12, 1984.
Supporting documentation is available at the CPSES site for your Inspector's review.
Very truly yours, w
BRC:tig Attachment cc: NRC Region IV - (0 + 1 copy)
. Director, Inspection & Enforcement (15 copies)
U.S. Nuclear Regulatory Commission Washington, DC 20555 fh nnR
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~, lTXX-4364 November-19, 1984 ATTACHMENT q
ROSEMOUNT TRANSMITTERS-Description' During.a periodic quality audit, the supplier (Rosemount) of pressure transmitters identified a potential leakage path in the seal of the threads between the sensor module and.the electronics housing. -As a result of this concern, additional production units were leak tested. Based upon the failures observed in these. tests, the supplier notified TUGC0 as required under the provisions 10CFR Part 21.
The leak path could allow moisture from the ambient surrounding environment to enter the electronics housing during abnormal operating conditions. This moisture could result in a malfunction of the transmitter.
The transmitters are installed in the post-accident sampling system which provides system monitoring during and after accident conditions.
Safety Implications In the event the conditions had remained undetected, the ability of the operator to monitor system performance under accident conditions could not be assured.
Corrective Action The above conditions and affected instruments have been documented on site non-confonnance reports (NCR-I-84-100466-S for Unit 1 and NCR-I-84-200169 for Unit 2). The nonconformance reports have been dispositioned as requiring repair / rework. This rework was completed by the suppliers representative either in the field or by returning them to the suppliers facility.
Instruments removed for repairs will be reinstalled prior to operation in accordance with the construction schedule.
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