ML19290D029
| ML19290D029 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/10/1980 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-25, NUDOCS 8002150503 | |
| Download: ML19290D029 (3) | |
Text
Yi Metropolitan Edison Company h;[.
f (-
Post Office Box 480 Middletown, Pennsylvania 17057 717 944-4041 Writer's Direct Dial Number Januaryl0, 1980 TLL 005 Office of Inspection and Enforcement Boyce H. Grier, Director Region 1 U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Sir:
Three Mile Island Nuclear Station, Unit I (TMI-1)
License No. DPR-50 Docket No. 50-289 Response IE Bulletin 79-25 Enclosed please find the responses to IE Bulletin 79-25, " Failures of Westinghouse BFD Relays in Safety-Related Systems."
Sincerely, s
v J. G. Herbein Vice President Nuclear Operations JGH:CDI: hah Enclosure cc:
Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 8002150[h Metrcpohtan Ed: son Comcany 1s a Meriter of the Genera Pubt.c Utv t;e3 System
TLL 005 ITEM 1.
Determine whether or not the following Westinghouse BFD/NBFD relays are used or planned for use in safety-related systems at your facilities:
a.
Type BFD, style 46E7352 or 766A235, coil style 503C428G21 b.
Type BFD, style 5069A95, coil style 1259C71Gl9 c.
Type BFD, style 5072A49, coil style 1271C50G01
RESPONSE
1.
The following type of Westinghouse BFD relay is used on safety-related systems:
a.
Type BFD, style 5072A49, coil style 1271C50C01 ITEM 2.
If such relays are used or planned for use, identify the safety-related systems involved, specific function of relays and provide in written form your plans for a test and/or replacement program which will assure design performance of affected relays.
RESPONSE
2.
The relays listed in response 1 a. are used as contro? relays for the lA and 1B Emergency Diesel Generators. Approximately sixty (60) of these relays are used.
Work-Request 2082 was initiated on November 29, 1979 to measure the armature overtravel of these relays.
This work has not commenced due to the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> load test (IEB 72-23) and annual main-tenance on the diesels.
However, we have not experienced any failures of the relays in normal operation.
ITEM 3.
The program to assure performance of af fected relays shall include, but not be limited to the following:
Establishment and adherence to a periodic testing and/or replacement a.
schedule to assure operability of applicable relays.
b.
The basis for the test interval of 3a. above including the data base upon which the initial test schedule is established, Development of approved procedures to be utilized by qualified c.
personnel for the testing and/or replacement of applicable relays.
d.
Relay failures found during program testing are to be documented in final report and reported at the time of finding in accordance with license requirements.
. - page 2 TLL 005
RESPONSE
3.
a.
A functional test will be performed on each relay during the diesel generator annual inspection.
b.
The annual test is adequate in that the monthly Emergency Power System Periodic Test and the quarterly ESAS Logic Test will detect any failures that will affect diesci operability.
c.
The diesel genarator annual inspection procedure will be revised to include a functional test.
d.
All relay failures found during the initial or follow-on program testing will be documented in accordance with the requirements set forth in the bulletin.