ML20128P254
| ML20128P254 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 07/02/1985 |
| From: | Martin T Public Service Enterprise Group |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8507260361 | |
| Download: ML20128P254 (2) | |
Text
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. Thomes J. Martin Public Service Electric and Gas Company 80 Park Plaza Newark, N.J. 07101 201/430-8316 Vica President Engineering and Construction July 2, 1985 Dr. Thomas E. Murley, Administrator U.
S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Dr. Murley:
POTENTIAL CONSTRUCTION DEFICIENCY TOBAR PRESSURE TRANSMITTERS HOPE CREEK GENERATING STATION On April 11, 1985, a verbal report was made to Region I, Office of Inspection and Enforcement representative, Mr. J.
Strosnider, advising of a potentially significant construction deficiency concerning pressure transmitters supplied by TOBAR, Inc.
On May 20, 1985, an interim report was sent to your office.
The following information is provided in accordance with 10CFR50.55(e).
During startup calibration, a Tobar transmitter exhibited output signal drift when subjected to warm and cool air currents directly on the amplifier assembly.
This temperature effect discrepancy raised questions regarding the accuracy and stability characteristics of the Tobar model 32, series 2 differential, gauge and absolute pressure transmitters.
Our preliminary investigation subjected transmitters to sharp temperature increases with " heat guns" which caused drifts exceeding the manufacturer's tolerances.
However, these results are inconclusive in that they are not indicative of actual operating-conditions.
Per the manufacturer's recom-mendation, we conducted controlled environmental tests in an attempt to duplicate the drift effect.
Twelve transmitters were subjected to temperature cycles between 30 F and 130 F using a heat oven.
The test results did not identify any transmitters, within the manufacturer's recommended six month
. calibration period, as exhibiting out of tolerance characteristics.
1935'l I;[E 8507260361 850702 PDR ADOCK 05000354 g
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~n Dr. T.
E. Murley 2
7/2/85 The model 32 series 2 transmitter'that appeared to exceed the manufacturer's drift tolerances two months following calibration was also subjected to a controlled temperature test with results indicating transmitter performance within the manufacturer's published tolerances.
Discussions with Tobar and Bechtel have served to clarify our setpoint methodology both for calculating allowable drift for in-plant temperature ranges and for determining appropriate
-calibration intervals by application.
Based on the above described investigation, we have determined that no deficiency exists with Tobar model 32, series 2 trans-mitters supplied to Hope Creek.
Consequently, we withdraw this item as not reportable in accordance with 10CFR50.55 (e).
N Very truly yours,
\\,
dK C
Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D.
C.
20555 NRC Resident Inspector - Hope Creek P.
O.
Box 241 Hancocks Bridge, NJ 08038 Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, GA 30339 A