ML20010H556

Interim Deficiency Rept Re Defects in Rosemount Model 1152 Pressure Transmitters W/Output Codes a or D.Sys Containing Subj Transmitters Will Be Analyzed for Most Adverse Pressure & Radiation Conditions.Also Reported Per Part 21

ML20010H556
Person / Time
Site:	Zimmer
Issue date:	09/04/1981
From:	Borgmann E CINCINNATI GAS & ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, 10CFR.50.55E, 10CFR50.55E, QA-1483, NUDOCS 8109250234
Download: ML20010H556 (2)

Text

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, 4-r TME CINCINNATI GAS & ELECTRIC COMPANY tW CINCINN AT1. OHIO 45201 September 4, 1981

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f#5 U. S. Nuclear Regulatory Commission ' >y'\ -..T;

'N Region III P (n p Y 799 Roosevelt Road 2~ { Q {i2., c' '

Clen Ellyn, Illinois 60137 g to g ~m //

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At tt .it ?.on : Mr. James C. Keppler .A t gpr g Director A #w C 7 -

RE: Wh, H. ZIMMER NUCLEAR POWER STATION - UNIT 1 h/ /g -

50.55(e) - ITEM M ROSEMOUNT MODEL 1152 ' ' 'l"

PRESSURE 'RANSMITTERS - DOCKET NO. 50-358, CONSTRUCTION PERMIT CPPR-88, W.O. #57300-957, JOB E-5590 l

! Gentlemen:

This letter constitutes an interim report under 10CFR50.55(e)

, rega-ding defects in Rosemount Model 1152 Pressure Transmitters with output Codes "A" or "D". Rosemount Inc. notified the NRC under 10CFR Part 21 that the mentioned transmitters produced ambiguous output currents under extreme over or under pressurized situations.

An investigation of available options indicated that the best alternative was to replace the "A" or "D" output circuit boards with "E" boards which did not appear to have the problem. A quotation was obtained from Rosemount for replacement boards.

On August 18, 1981, as a purchase order was about to be placed for i "E" boards, a Rosemount Bulletin was received which stated that at an undetermined minimum r..diation exposure, the "E" boards also experience the same ambiguous output problem. Since all of the Zimmer essential

' transmitter will receive some degree of radiation, simply replacing the boards is no longer a total solution.

In light of this information, the systems containing such transmitters

, will be analyzed for the most adverse conditions of prese 1 e and radiation which they may experience to determine whether or not any of them could experience the phenomena in question. We will inform you of the results of our analysis by October 30, 1981.

Q~>-] r i D DOC oho 8 PDR

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Mr. James G. Keppler Director U. S. Nucicar Regulatory Commission Region III September 4, 1981 QA-1483 Page 2 i We trust this letter Will fulfill the requirements of an interim letter under 10CFR50.55(e) .

Very truly yours, Tile CINCINNATI CAS & ELECTRIC COMPAIN By M. A. BORGMANN SENIOR VICE-PRESIDENT FKP:ac cc: NRC Resident Inst.cctor Attn: W. F. Christianson NRC Of fice of Inspection & Enforcement Washington, D.C. 20555

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