ML20095K895

Provides Suppl to 900717 Initial Response to NRC Bulletin 90-001, Loss of Fill-Oil in Transmitter Mfg by Rosemount. Util Will Replace 24 Unit 1 Transmitters & 23 Unit 2 Transmitters & 2 Transmitters Common to Both Units

ML20095K895
Person / Time
Site:	Calvert Cliffs
Issue date:	04/29/1992
From:	Creel G BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEIN-90-001, IEIN-90-1, TAC-M76537, TAC-M76538, NUDOCS 9205060085
Download: ML20095K895 (2)

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• BALTIMORE GAS AND ELECTRIC 1650 CALVERT CUFFS PARKWAY LUSBY, MARYLAND 20657 4702

- Gronor C. Cnt CL viet Pas siotNT NucLtAmLNtuoy (eio)aco-eese April 29,1992 U. S. Nuclear Regulatory Commission Washington,DC 20555 ATTENTION: Document Contr01 Desk SUBJEQ Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2: Docket Nos. 50-317 & 50 318 Supplemental Response to NRC Eulletin No. 90-01; less of Fill-Oil in Transmitters Manufactured by Rosemount (TACW6537 &m76538)

REFERENCES:

(a) letter froin Mr. G. C. Creel (BG&E) to NRC Document Control Desk, dated July 17,1990 "NRC Bulletin No. 90-01: less of Fill Oil in Transmitters Manufactured by Rosemount" (b) Letter from Mr. W. 11. Rasin (NUMARC) to NUMARC Administrative Points-of-Contact, dated April 6,1990, "Rosemount Transmitter Oil Loss" Gentlemen:

Reference (a) was our initial response to NRC Bulletin 90-01. It addressed Rosemount Model 1153 Series B,1153 Series D .md Model 1154 pressure and differential pressure transmitters manufactured prior to July 11,1989, and utilized in safety related systems or 10 CFR 50.62 systems (hereinafter called bulletin transmitters). It stated that all bulletin transmitters would be replaced during each unit's next outage. We have revised the scope of our response to NRC Bulletin 90 01 to be consistent with Enclosure (1) of Reference (b). Specifically, the scope was narrowed to only those transmitters "which perform safety-related (or ATWS) functions" rather than those " utilized in safety related systems." We are excluding bulletin " transmitters wh.3sc only safety function is that of a pressure boundary." In addition to excluding pressure boundary-only bulletin transmitters, we re-evaluated the safety-related functions of other transmitters. The net effect is we will now replace 24 Unit 1 transmitters,23 Unit 2 transmitters and 2 transmitters common to both t. nits.

Due to delays in receiving the replacements caused by both procurement backlogs at Baltimore Gas and Electric Company and manufacturing backlogs at the vendor, we are no longer confident that the original schedule to replace Unit 1 bulletin transmitters can be met. All replacements have been shipped by the vendor. Delivery is expected by May 15,1992. If the transmitters are received in time, we will make every reasonable effort to install them during the current Unit 1 outage.

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April 29,1992

. Page 2 If not, our plan to install them is as follows:

1. During the current outaj, all Unit 1 bulletin transmitters installed in containment will be replaced (6 total).

2. During the current outage, all bulletin transmittets installed on containment air coolers will be replaced (4 total).

3. Prior to starting Unit 1, the time response test summarized in Reference (a) will be performed on the remaining Unit 1 bulletin transmitters (14 total) if they are not replaced during the current outage.  ;

4. If the remaining Unit i bulletin transm;',crs (14 total) are not replaced during the current outage, they will be replace <16 possible in conjunction with other scheduled

- maintenance during plant operation. At the latest, they will be replaced during the next refueling outage (spring 1994).

l S. The bulletin transmitters common to both units (2 total) will be replaced as possible i during operation. At the latest, thry will be replaced during the next refueling outage (i.e., spring 1993).

6. The Unit 2 bulletin transmitters (23 total) will be replaced during the next Unit 2 refueling outage (spring 1993).

There is no safety impact due to extending the replacement schedule. The function of the transmitter will be verified either by replacing it or by tirac. response testing it during the current Unit 1 outage.

Should you have any further questions regarding this matter, we will be pleased to discuss tbam with you.

l Very truly yours.

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GCC/JMO/ dim ee: D. A. Brune, Esquire J. E. Silberg, Esquire R. A. Capra, NRC D. G. Mcdonald, Jr., NRC T. T. Martin, NRC P. R. Wilson, NRC R. I. McLean, DNR l J. H. Walter, PSC 1

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