ML20031C617
| ML20031C617 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 09/18/1981 |
| From: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 810918, 957-3R, IEB-80-16, NUDOCS 8110070358 | |
| Download: ML20031C617 (2) | |
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f THE CINCINNATI GAS & ELECTRIC COMPANY sW-CINCf NN ATf,OHf 0 45201 September 18, 1981 E. A. BORG M AN N stN*on vect PatsrDENT United States Nuclear Regulatory Commission f
e Office of Inspection and Enforcement Region III 6
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799 Roosevelt Road N
Glen Ellyn, Illinois 60137 gg.7 ATTN: Mr. James G. Keppler n%gg 88/g.3 Regional Director b
RE:
WM. H. ZIMMER NUCLEAR POWER STATION - UNIT 1 h IE BULLETIN 80-16, DOCKST # 50-358, W.O. 57300 N h " @.
JOB E-5590, FILE # 957-3R Gentlemen:
This will provide an update to our previous response dated July 25, 1981 to IE Bulletin 80-16. This Bulletin concerns the ambiguous output characteristics displayed by certain Rosemount Model 1151 and 1152 pressure transmitters when subjected to over or under pressurization.
Initial investigations indicated replacement of the de-fective "A" and "D" electronic circuit boards with "E" boards would resolve the concern since the "E" boards were tested by Rosemount and found not to have the problem. A quotation was obtained to purchase the required number of "E" boards.
On August 18, 1981 a Rosemount internal Bulletir. on the sub-ject was received from our local Rosemount Representative. This Bulletin revested the recent discovery that the "E" boards, after having been exposed to radiation, exhibit a similar ambiguoas output phenonmen. The level of radiation which causes the ambiguity to appear has not yet been deterimined.
Since we cannot at this time be certain replacement alth "E" boards will resolve the concern, we are doing an analysis of eal Rosemount application. There is a pressure range within which the current transmitters do not exhibit ambiguous output. We plan to investigate the maximum possible over-pressure and under-pressure Sc"/
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Mr. James G. Keppler IEBulletin$0-16 Page 2 for evh transmitter and determine if these values are within j
the range where ambiguity does not occur.. If a transmitter j
maximum or minimum pressure falls outside that range, other corrective measures will be developed.
You will be advised of the results of the analysis at its conclusion.
Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY r
=
i E.A. BORGMANN, SENIOR VICE PRESIDENT i
JEC/kjd cc:
J.D. Flynn H.R. Sager J.R. Schott R.F. Scheibel F. Christianson (S!.te Rep.)
4 NRC Office of Inspection & Enforcement General File a
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