ML20149G893
| ML20149G893 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 10/28/1994 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9411080163 | |
| Download: ML20149G893 (3) | |
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DukeibwerCbmpany T. C McMaw McGwre Nuclear Generation Departmed Vice President 12700Hagers FerryRoad(MGoIW)
(TC4)87f4800 Huntersplie, NC280 IBM (704)8754WJFax
)
DUKEPOWER October 28, 1994 U. S. Nuclear Regulatory Commission Document Control Desk Washington D. C.
20555
Subject:
McGuire Nuclear Station Dockets Nos. 50-369,-370 Request for AdditionalInformatior Regarding Rosemount Transmitters 1
Gentlemen:
Attached are McGuire's responses to the questions submitted by The Nuclear Regulatory Commission via fax of July 6,1994 regarding Rosemount Transmitters.
If there are any questions regarding this response. please contact Dwin Caldwell at (704) 874-4328.
Very truly yours, h MRs T. C. McMeckin cc:
(with attachments)
Mr. S. D. Ebneter Mr. Bob Martin Regional Administrator, Region 11 U. S. Nuclear Regulatory Commission U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation 101 Marietta St. NW Suite 2900 One White Flint North, Mail Stop 9H3 Atlanta, Georgia 30323 Washington, D. C.
20555 Mr. Victor Nerses Mr. George Maxwell U. S. Nuclear Regulatory Commission Senior Resident inspector Office of Nuclear Reactor Regulation McGuire Nuclear Station
.One White Flint North, Mail Stop 9H3 Washington, D. C.
20555 30119
/9?
9411080163 941029
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PDR ADOCK 05000369 I {
P PDR t
ROBEMOUNT TRANSMITTERS TECHNICAL BULLETIN #4 REQUEST FOR ADDITIONAL INFORMATION NOTb: The following is McGuire Nuclear Station's response to NRC questions arising from a previous Duke Power response to requested actions to NRC Bulletin 90-01 Supplement 1: " Loss of Fill-Oil in Transmitters Manufactured by Rosemount".
Requested Action Ib: For the data used to conclude that stable performance was seen, did that data meet the criteria of Rosemount Technical Bulletin #4?
Yes, McGuire transmitters have reached the psi-month threshold criterion of 60,000 psi-months or 130,000 psi-months (depending on the range code of the transmitter) as recommended by Rosemount.
The data used to conclude stable performance meets the criteria of Rosemount Technical Bulletin #4.
All transmitters prior to reaching their psi-month threshold were subjected to sluggish response testing anc~
calibration data trending. Once psi-month threshold is met, as found/as left calibration data is recorded and monitored ensuring reliable performance in detecting oil loss failures.
Requested Action le: Additionally, the supplement asks that a high degree of confidence be maintained in the ability to detect failures in then?
transmitters due to a loss of fill-oil.
How are they maintainina uonfidence in the ability to detect failures due to fill-oil loss?
Once transmitters have met their psi-month thresholds, they are excluded from the enhanced surveillance program.
Even thench transmitters are excluded from enhanced surveillance, McGuire continues to keep track of calibration data for review and trending.
Periodic review of this calibration data is performed and would reveal shifts or degradation due to oil-loss.
Requested Action If:
Same as le, but for transmitters that have a nominal operating pressure less than or equal to 500 psi.
McGuire keeps track of calibration data for review and trendi"g for transmitters even after they have been excluded from enhancoc surveillance activities.
Periodic review of this data is performed and would reveal shifts or degradation due to oil-loss.
Requested Action 2:
Is this program in accordance with Rosemount Technical Bulletin #4? Does this meet minimum requirements as put forth in the Focemount TB#4, Supplement l? Are they trending calibration and/or operating data? Does data obtained meet the criteria of Rosemount TB#4?
McGuire's enhanced surveillance program is in accordance with Rosemount's Technical Bulletin #4.
Until specific requirements are met to exclude transmitters from enhanced surveillance, they are subjected to sluggish response testing and calibration data trending.
To ensure any degradation in performance is detected, calibration data collection and trending continues throughout the life of the transmitter.
Data from redundant transmitters is required to properly trend operating data. Due to non-redundant transmitters, McGuire trends calibration data only.
bxc:
(with attachments) s
- 6. V. Carr
~ NSRUSLaR J. E. Snyder R. J. Deese J. E. Durchfield (ON0lRC).
Z. L Taylor (CN0lRC)
V. M. Coren (EC05N)
ELL (EC050)
D. M. Jamil P. R. Herran A. M. Hinson e
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