ML19344A838
| ML19344A838 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 07/01/1980 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML19344A831 | List: |
| References | |
| PE-2335, NUDOCS 8008220321 | |
| Download: ML19344A838 (4) | |
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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 (2151841-4502 vtCE#stEslOENT JUL -11S30 Mr. Boyce Grier, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
SUBJECT:
Significant Deficiency Report No. 12 Rosemont Model 510DU Trip / Calibration Units and Model 1152 Transmitters Limerick Generating Station, Units 1 and 2 NRC Construction Permit Nos. CPPR-106, -107 ATTACHMENT:
Letter PE-2335 H.G. DeVoss (GE Co.) to R.A.
Mulford (PECO) dated April 30, 1980 FILE:
QUAL 2-10-2 (SDR #12) i
Dear Mr. Grier:
1 The attachment has brought to our attention a deficiency in the subject Rosemont trip / calibration units and transmitters which has previously been reported to the USNRC on March 21, 1980 by General Electric Company under the provisions of 10CFR, Part 21.
The subject
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Rosemont equipment is being supplied by General Electric i
for use at Limerick Generating Station.
We consider the defiencies described in the attachment a significant deficiency per 10CFR50.55(e) and are hereby notifying you as required.
We believe that the General Electric report submitted under the provisions of 10CFR, Part 21 provides the information required for 10CFR50.55(e) reporting.
Therefore we anticipate l
that this letter will be our only report to you on the subject.
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Mr. Boyce Grier, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Commission.
We will, of course, assure that defective Rosemont units at Limerick are corrected in accordance with the instruction received from General Electric.
Sincerely, IM RJL:drd cc:
Director of Inspection and Enforcement United States Nuclear Regulatory Commission Washington, DC 20555 l
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o GEN ER AL h ELECTRIC NUCLEAR POWER S Y S T E M, S DIVISIC GENERAL ELECTRIC COMPANY.175 CURTNER AVE., SAN JOSE. CAUFORNIA 95125
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MC 391, (408) 925-5159
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5 April 30, 1980 Edu PE-2335
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Mr. R. A. Mulford, Project Manager LGS Units 1 & 2 c.
2301 Market Street Philadelphia Electric Company
. Philadelphia, PA 19101
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Dear Dick:
SUBJECT:
LIMERICK GENERATING STATION, UNITS 1 & 2 REPORTABLE CONDITICS, ROSEMONT MODEL 5100U TRIP /C.^.LIBRATION UNITS AND MODEL 1152 TRANSMITTERS This is to advise you that GE sent notice to the NRC of a reportable defect per 10CFR, Part 21 on March 21, 1980.
This defect is in the Rosemont 51000 trip / calibration units and Model 1152 pressure trans-mitters.
The defect was judged reportable on March 19, 1980.
Attached is the report of the defect as it applies to BWRs.
We are presently identifying the location of the defective devices and will be forwarding instructions for correcting the defects in the near future.
Very ul yours, ^
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H. G. DeVogs Project Mahager i
Limerick Generating Station HGD:1m:jlk/2092 3K Attachment cc:
R. H. Elias J. B. Roche W. J. Heal J. H. Walton File: LB/3.1/H12/RC/3.ll.3
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e Reportable Condition Rosemount Trip / Calibration Unit and Transmitter Gen.*ral Electric has been advised by Rosemount that some of.the Model 51000 trip / calibration units and Model 1152 pressure transmitters contain defects which if lef t uncorrected would p,re, vent proper performance of their safety function.
The trip unit is used in conjunction with the
, pressore transmitter to provide high or low trip si' nals.
The pressure g
transmitter is used for direct pressure measurement transmission or as a level sensor in conjunction with a differential pressure measuring device.
The trip unit has a common mode failure of an essential switch that determines the trip output logic.
The malfunction open-circuits the logic 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 h
low water level.
The trant.mitter has a common mode failure of a capacitor when the trans-mitter operating temperature is greater than 175'F or when the damping potentio=cter is rotated clockwise.
The failure is manifested as a drop in transmitter output current up to 10 percent of the correct current.
As an example, when used as a pressure transmitter, this can result in transmitting reactor pressure 10 gercent lower than actual.
The following corrective actions have been initiated:
Rosen.ount will replace the defective switches in the affected trip units and the defective capacitors in the af fected transmitter units that have been shipped-to-GE including those shipped on to utilities by GE.
GE will notify all potentially affected utilities and apprise them of the corrective actions to taka.
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