ML19320D068
| ML19320D068 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 06/14/1980 |
| From: | Fiorelli G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| References | |
| NUDOCS 8007180495 | |
| Download: ML19320D068 (1) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMIS510N
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atEn Ettvu ILLINOIS 60137 (j{Jl,8 14 N Docket No. 50-440 Docket No. 50-441 The Cleveland Electric Illuminating Company ATTN: Dalwyn R. Davidson Vice President - System Engineering and Construction Post Office Box 5000 Cleveland, OH 44101 Gentlemen:
Thank you for your final report dated June 30, 1980, pursuant to 10 CFR 50.55(e) regarding Rosemount Model 510 DU Trip Calibration Units /1152 Pressure Transmitters. We will complete our review of this matter during a future inspection.
Your cooperation with us is appreciated.
Sincerely, I
S o
Caston Fiorelli, Chief Reactor Construction and Engineering Support Branch cc w/1tr dtd 6/30/80:
PDR Local PDR NSIC TIC Harold W. Kohn, Power Siting Commission Mr. Daniel D. Wilt, Attorney Helen W. Evans, State of Ohio cc: Central Files Reproduction Unit NRC 20b 8007180 $f
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L t. L U f-l C I L I. U f2 l N AT l h G C 0 f,: F A N Y ILLUMINATING BLOG. e PUSUC SOUARE e CLEVELAND. oMio 44101 e TILIPHONE (218) 823 1250 m MAIL ADDRiss: P.o. Box 9000 Serving The Best location in the Nation Datwyn R. Davidson June 30, 1980 wCE ratsiotNT SY5ttu ENGINEERING AND CONSTRUCTION Mr. James G. Keppler Director, Region III Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission
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Glen Ellyn, Illinois 60137 RE: Perry Nuclear Power Plant Final Report Rosemount i
Model 510 DU Trip Calibration Units /1152 Pressure Transmitters
Dear Mr. Keppler:
This letter will serve as the final report as required by 10CFR50.55(e) on the potential significant deficiencies concerning Rosemount Model 510 DU Trip /
GE notified Calibration Units and Rosemount Model 1152 Pressure Transmitters.
the NRC of this reportable deficiency per 10CFR, Part 21 in May 1980.
These items were discussed in a telephone conversation between Mr. W. J. Kacer of The Cleveland Electric Illuminating Company and Mr. Jim Konklin of the Nuclear Regulatory Commission, Region III, Office of Inspection and Enforcement on June 3, 1980.
Description of Deficiency The Model 510 DU Trip / Calibration Units were manuf actured by Rosemount Industries and supplied through the Nuclear Steam Supply System contract with The reportable condition was identified following a letter from General GE.
Electric-San Jose to The Cleveland Electric Illuminating Company (PY-GEN /CEI-1291).
The trip / calibration unit is used in conjunction with the pressure transmitter to provide high or low trip signals. The trip unit has a common mode failure A malfunction of an essential switch th
- determines the trip output logic.
As an could open circuit the loh.;c, thereby providing an inoperable signal.
exasple, when used as an ECCS water level trip unit, this can result in failure to trip on low water level. Currently the site has identified all Rosemount trip units. The trip units with Serial Numbers 3001 through 4203 will be rebuilt and requalified by Rosemount and returned to the site.
The potential deficient trip units are documented on General Electric's Field Disposition Instruction (PDI) - WNHW Rev. O and I dated May 2,1980, and May 20, 1980, respectively. These documents are on file at the Perry Nuclear Power Plant.
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2 Juna 30, 1980 Mr. Jameo G. K pplar The Model 1152 Pressure Transmitters were manuf actured by Rosemount Industries SI411arly, and supplied through the Nuclear Steam Supply System contract with GE.
the reportable condition was identified following a letter from GE-San Jose to The pressure The Cleveland Electric Illuminating Company (PY-GE"/CEI-1291).
transmitter has a potential common mode failure of a capacitor when the trans-mitter operating temperature is greater than 175'F or when the damping poten-tiometer is rotated clockwise. The failure is manifested as a drop in trans-As an example, when mitter output current up to 10% of the correct current.
used as a pressure transmitter, this can result in transmitting reactor pressure f
10% lower than actual. Currently the site has identified all Rosemount 1152 Pressure Transmitters installed in GE hardware that has been supplied to the The amplified boards of the affected transmitters will be replaced per site.
Rosemounts request with replacement amplifier boards.
The transmitters that include the potential deficient amplifier boards are documented on General Electric's Field Disposition Instruction (FDI) - WREC and WNHX Rev. O and 1 dated May 2, 1980, and May 20, 1980, respectively.
These documents are on file at the Perry Nuclear Power Plant.
The replacing of the amplifier boards and the trip units will begin in September with an anticipated completion date of January 1, 1981.
Very truly yours, Dalwy R. Davidson Vice President Systs Engineering and Construction DRD:kd T18/A/2 cc: kr. Victor 8tello, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission washington, D.C.
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