ML19341A862
| ML19341A862 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/14/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-80-06, IEB-80-6, NUDOCS 8101280527 | |
| Download: ML19341A862 (2) | |
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300 Chestnut Street Tover II
\\J$\\S January 14, 1981 9
Mr. James P. O'Reilly, Director
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Dear Pr. O'Reilly:
CFFICE OF INSPECTION AND EMFORCT'ENT BULLETIN 80 RII:JPO 90-259,
-260, -296 Enclosed are the results of our analyses on the diesel fenerators and 480 Volt load shed logic reisted to IE Bulletin 80-06 for the Brottne Ferry Nuclasr Plent.
If you have any questions regsrding this nstter, please call Jim Domer at FTS 857-2014 Very truly yours, TENNESSEE VALLEY AUTP.0RITT
.M.
L. H. Mills, Ma ager Nuclear Regulation and Safety d
sworn before Subscrib9 og-day of
< 1981.
ee this / Sa-l
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L Notary Public I
Hy Comission Expires i
Enclosure I
cc: Office of Inspection cnd Enforcement (Enclosures)
U.S. Nuclear Regulatory Commission l
Division of Reactea Operations Inspection l
Washington, DC 20555 l
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ENCLOSURE IE EULLETIN 80-06 BROVNS FERRY NUCLEAR PLANT (DOCKET NOS. 50-259,-260,-296) 1.0 Diesel Generator Controls As indicated in our December 3, 1980, letter, some diesel generator control logic will be changed upon reset of the ESF logic; specifically protective relaying will be enabled as follows:
1.
Reverse Power 2.
Loss of excitation 3.
Overcurrent with voltage restraint
- -.,= -
It is desirable to return this protective relaying to service to ensure long term diesel availability.
Also, safety analysis indicates
- that enabling the protective relaying does not af f ect the short term availability of the diesels.
Accordingly, the present design is the preferred arrangement.
2.0 480V Load-Shed Logic As indicated in our December 3,1980, letter, ESF reset will af fect the 480V load-shed logic.
Particularly, ESF reset will retie certain minor safety related loads onto the 4SOV shutdown boards automatically. Operarfanally, it is desirable to reinstate the loads and our preliriaary review indicates that ample capacity is i
available on the ciectrical distribution. We are, however, l _ - rr_r_-- _ evaluating this further and will notify NRC if this arrangement _ __
presents any problems..
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