ML19320A933
| ML19320A933 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 06/30/1980 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | |
| References | |
| NUDOCS 8007080294 | |
| Download: ML19320A933 (2) | |
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' IHE CLEVLL AND ELECTRIC ILLUMIN ATING COMPANY ILLUMINATING 8 LOG. e PUBUC SOUARE e CLEVELAND. oHlo 44101 e TELEPHONE (216) 623-1350 e MAIL ADDRESS: P.o. BOX 5000
'o nna liv ih e.t Inonnin in (b: Nation Dalwyn R. Davidson v.ct enEsiDENr June 30, 1980 S VSIE U (NGitd E RING AND CONSTRUCitON Mr. James G. Keppler Director, Region III Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 RE:
Perry Nuclear Power Plant Final Report Rosemount Model 510 DU Trip Calibration
Dear Mr. Keppler:
Units /1152 Pressure Transmitters This letter will serve as the final report as required by 10CFR50.55(e) on the potential significant deficiencies concerning Rosemount Modei 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, Of fice of Inspection and Enforcement on June 3, 1980.
Description of Deficiency The Model 510 DU Trip / Calibration Units were manufactured by Rosemount Industries and supplied through the Nuc1 car Steam Supply System contract wi.h GE.
The reportable condition was identified following a letter from General 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 of an essential switch that determines the trip output logic. A malfunction could open circuit the h 'ic, thereby providing an inoperable signal.
As an example, 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 (FDI) - WNIN Rev. O and 1 dated May 2,1980, and May 20, 1980, respectively. These documents are on file at the Perry Nuclear Power Plant.
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Mr. James G. Kcppisr 2
Juns 30, 1980 The !!odel 1152 Pressure Transmitters were manuf actured by Rosemount Industries and supp12ed through the Nuc1 car Steam Supply System contract with GE.
Similarly, the reportable condition was identified following a letter from CE-San Jose to The Cleveland Electric Illuminating Company (PY-CEN/CEI-1291).
The pressure 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-mitter_ output current up to 10% of the correct current, ha an example, when used as a pressure transmitter, this can result in transmitting reactor pressure 10% lower than actual. Currently the site has identified all Rosemount 1I52 Pressure Transmitters installed in GE hardware that has been supplied to the site. The amplified' hoards of the affected transmitters will be replaced per 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 !iNRX Rev. O and 1 dated May 2, 1980, and May 20, 1980, respectively.
These documents are on file at the Perry Nucicar 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, A
h prd Dalwy R. Davidson Vice President System Engineering and Construction DRD:kd T18/A/2 cc: Mr. Victor Stello, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
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