ML20077P106
| ML20077P106 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 08/14/1991 |
| From: | Gates W OMAHA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LIC-91-074R, LIC-91-74R, NUDOCS 9108150253 | |
| Download: ML20077P106 (2) | |
Text
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Omaha Public Power District 444 South 10th Street Mau Omaha, Nebraska 68102 2247 402/636 2000 August 14, 1991 LIC 91-074R V. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station PI-137 Washington, DC 20555
References:
1.
Docket No. 50-285 2.
Letter from OPPD (K. J. Morris) to NRC (Document Control Desk) dated August 31, 1989 (LIC-89 815)
Gentlemen:
SUBJEC1:
Resolution of ilED 93 Regarding Single Indicating lamps As part of the Detailed Control Room Design Review, Omaha Public Power District (OPPD) identified several Human Engineering Discrepancies (llEDs).
HED 93 identified a concern that, "in general, indicator lights do not have a lamp test feature."
Reference 2 provided OPPD's commitment to resolve llED 93 using LED indicating
- lamps, lhe purpose of this letter is to revise the commitment proposing the use of the LED lamps as a resolution to HED 93.
OPPD has discovered that in the practical use of LED indicating lamps, some human factors shortcomings may be introduced.
When an LED lamp is viewed from an off-axial point, the intensity is considerably lower or non-detectable.
Other deficiencies are unavailability of LED lamps in white (a commonly used lamp color in the Control Room), and operator unfamiliarity with LEDs in the Control Room.
OPPD plans now to resolve this issue by instituting an administrative control program of periodic lamp testing and replacement which will ensure the detection of failed single indication lamps in the Control Room, n o3 t r9:3. omya
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e V. S. Nuclear Regulatory Commission t!C 91 074R fage 2 Major elements of this program are as follows:
All critical, normally-off, non testable, single indication lamps will be identified.
These critical indication lamps will be incorporated into the preventative maintenance (PM) program.
The initial 3rogram impicmentation will include replacement of all identified lamps witi functionally pretested lamps.
Each 6 months, all lamps in the program will be removed, functionally tested, and replaced with new pretested lamps.
Data concerning the percentage of operable lamps will be analyzed in accordance with the PM.
As lamps are verified operable prior to installation and tested when removed, a percentage of operable lamps at the end of the period will be established.
The percentage of lamps verified operable will be used to adjust the PM frequency if necessary.
This approach is a more effective method to resolve this llED.
Based on the success of this method elsewhere in the industry, it appears that a high degree of confidence for o)erability of Control Room indicator lamps can be achieved without incurring tie disadvantages of LED usage.
OPPD is proceeding with the development of this program with the initial impicmentation prior to the next maintenance and refueling outage in 1992, if you should have any questions, please contact me.
Sincerely,
- . 4. A W. G. Gates Division Manager Nuclear Operations WGG/sel c:
LeBoeuf, Lamb, Leiby & MacRae R. D. Martin, NRC Regional Administrator, Region IV W. C. Walker, NRC Project Manager R. P. Nullikin, NRC Senior Resident inspector
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