ML19321A810
| ML19321A810 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 07/01/1980 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| References | |
| REF-PT21-80-205-007 NUDOCS 8007240226 | |
| Download: ML19321A810 (5) | |
Text
ATTAGED IS A PART 21 REPORT FROM IE MAIL UNIT - ROOM 359 E/W PART21IDENTIFICATIONNO.-
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PRELIMINARY EVALUATION OF THE ATTACHED REPORT ItOICATES LEAD RESPONSIBILITY FOR FOLLOWUP AS SFOhN BELOW:
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PEV: 7/9/80 l
PHILADELPHIA ELECTRIC COMPANY 23O1 MARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 (2151 841-4 5o 2 JC HN S. KEMPER Vits mR ESID ENT sesseesta neo a asso massancee JUL -11980
@Q-aloS~-c)O7 Mr. Boyce Grier, Director Office of Inspection and Enforcenent Regien I United States Nuclear Regulatory Concissien 631 Park Avenue King _of Prussia, PA 19406 SU3 JECT:
Significant Deficiency Repcrt '~ o. 12 Rosemont I:odel 510nD Trip / Calibration Units and Podel 1152 Transnitters Li= crick Generating Station, Units 1 and 2 NRC Construction Percit Nos. CFFR-106, -107 ATTACEMEnT:
Letter PE-2335 E.G. DeVoss (CE Co.) to R.A.
Mulford (PECO) dated April 30, 1980 FILE:
QUAL 2-10-2 (SDR #12)
Dear Mr..Grier:
The attachsent has brought to our attention a d e,f ici en cy in the subject Recenont trip / calibration units and tranc=itters which has previously been reported to the USNRC on March 21, 1980 by General riectric Conpany under the provisions of 10CFR, Part 21.
The subject Rosemont cquipment is being supplied by Generel Electric for use at Lincrick Generating Station.
We consider the defiencies described in the' attachment a significant deficiency per 10C FF.5 0. 5 5 ( c ) and are hereby notifying you as-ruquired.
We believe that the General Electric rcpert subnitted under the provisioss of 10CFR, Part 21 provides the infernation required for-10CFR50.55(e) reperting.
Thereferc we anticipate that this ~1etter will be - our only report to you on the subject.
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4 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, S $f-RJL:drd n(' :
Director of Inspection and Enforcement c
,e United States Nuclear Regulatory Commission Washington, DC 20555 O
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GENERAL ELECTRIC COMPANY,175 CURTNER AVE.. SAN JOSE, CAltrORNIA S5125 MC 391, (408) 925-5159
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April 30, 1980 5
PE-2335 130U Mr. R. A. Mulford, Project Manager LGS Units 1 & 2 2301 Market Street Philadelphia Electric Company
. Philadelphia, PA 19101
Dear Dick:
SUBJECT:
LIMERICK GENERATING STATION, UNITS 1 & 2 REPORTABLE CONDITIGA, ROSEMONT P.00EL 51000 TRIP /C.^.LIBRATIC.
UNITS AND MODEL l-152 TRANSMITTERS ThisistoadviseyouthatGEsentnoticetotheNRCofarepbrtable 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 defec.tive devices and will be forwarding instructiors for correcting tne defects in the near future.
Very
'ul3 yours, Og Y2 M
H. G. DeVo s Project Ma/ lager Limerick Generating Station HGD:lm:jlk/2092 3K Attachment 4
cc:
R. H. Elias J. B. Roche W. J. Neal
/
J. H. Walton /
File: LS/3.1/H12/RC/3.ll.3
r Reportab'e Condition f}
Rosemount Trip /Calit.ation Unit and Transmitter 1.
N*
!,J Gen.'ral Electric has been advisc d by Rosemount that some of. the Mode'.
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510D0 trip / calibration units and Model 1152 pressure transmitters cc-gj de f ec ts wh i'.h if left uncorrected would prevent proper performance c; their saf ety function.
The trip unit is used in conjunction with the pressure transmitter to provide high or low trip signals.
The pressu transmitter is used for direct pressure measurement transmission or t.
j a level sensor in conjunction with a dif ferential pressure measur ing i
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 t*.ereby providing an inoperable signal.
As an example,. shen use d
as an ECCS water level trip unit, this can result in failure to trip c low wate'r level.
The transmitter has a common mode failure of a capacitor when the trar mitter operating temperature is greater than 175 F or when the campine
-potentiometer is rotated clockwise.
The failure is carifested as a dr in transmitter output current up to 10 percent of the correct current.
As an example, when used as a pressure transmitter, this can result ir transmitting reactor pressure 10 percent lower than actual.
i The followi ; corrective actions have been initiated:
Rose..ount will replace the defective switches in the affected trip uni ~
and the defective capacitors in the affected transmitter units that hc been e ipped"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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