ML19332A440
| ML19332A440 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 09/09/1980 |
| From: | Epps R LAWRENCE LIVERMORE NATIONAL LABORATORY |
| To: | Shemanski P Office of Nuclear Reactor Regulation |
| References | |
| RE-80-09-05, RE-80-9-5, NUDOCS 8009150490 | |
| Download: ML19332A440 (2) | |
Text
-
o
~
p LAWRENCE LIVERMORE LABORATORY id September 9, 1980-RE 80-09-05' Paul Shemanski, Operating Reactors Assessment Branch Division of Licensing
~
U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Paul:
SUBJECT:
BROWNS FERRY NUCLEAR STATION, DOCKET NOS. 50-259, 50-260 and 50-296 (TAC's 07884, 07885 and 07886)
REFERENCE:
1.
NRC-letter to Tennessee Valley Authority (TVA) of March 29, 1977 2.
TVA letter to NRC of June 3, 1977 3.
LLL Report, UCID-18145, " STATUS OF EVALUATION AND MODIFICATIONS OF DIESEL GENERATOR STATUS ANNUNCIATOR SYSTEMS AT VARIOUS U.S. NUCLEAR POWER PLANTS," October 1979 In their letter [Ref. 1], the.NRC ' requested that'TVA provide information on the status annunciator system for the diesel generators at their facility.
This request for information was prompted by reports from licensees, i.e.
LER's on incidents where diesel generators failed to respond to automatic start signals because control switches or lockout and shutdown relays were left in the shutdown condition by operators unaware of their status.
The principal reasons for this lack of awareness were:
1.
The sharing of annunciator stations for both disabling and non-disabling alarm conditions, 2.
wording on annunciator windows for disabling conditions which did not specifically say a diesel generator emergency start was blocked.
3.
Disabling conditions which were not annunciated in the Control Room.
e s[9, o 1
--3:
- 3 r-e tur
- r;, cms-tra :: 5u s:; t..y c:qcarz a y5
. ~, ~
.::. < ~
~.e,
8009150 ff 9
~
The licensee responced by letter [Ref. 2], describing the diesel generator annunciator system.at the Browns Ferry Nuclear Power Station. A review of the licensee's response had identified two areas of concern:
1.
The position of the OPERATION MODE SWITCH.is not annunciated to the Control Room.
2.
There is a sharing of annunciator stations for disabling and non-disabling conditions.>
In order to provide the-operators with accurate, timely and complete information pertinent to the status of the diesel. genera'.or control systems, as required by IEEE Std. 279-1971 and NRC letter of Marcn 29, 1977 [Ref. 1],
the following corrective adions are required:
1.
The condition of the OPERATION MODE SWITCH must be annunciated in the Control Room.
2.
Annunciation of disabling and non-disabling diesel generator
. conditions must be separated and annunciated on separate windows in the Control Poom.
3.
Wording in the annunciator wincows should be clear ano-unambiguous such as:
(a) Disabling Conoition - DIESEL GNE # AUTO START LOCK 0UT.
(b) tion-cisabling condition - DIESEL GEF: # TROUBLE.
It is recommendeo that the licensee be informed of the above requirements and that corrective action be implementea.
Special Issues Program Nuclear Systems Safety Program RCE:el Copy to:
M.H. Dittmore R.~A. Victor 1
e'