ML17037B634
| ML17037B634 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/28/1977 |
| From: | Lear G Office of Nuclear Reactor Regulation |
| To: | Rhode G Niagara Mohawk Power Corp |
| References | |
| Download: ML17037B634 (4) | |
Text
MAR 2 8 1977 Docket Ho. 50-220 Niagara Mohawk Power Corporation ATTN:
Hr. Gerald K. Rhode Vice.President -
Engineering'00 Erie Boulevard West
- Syracuse, ties York 13202 Gentlemen:
RE:
t>IHE BILE POINT NUCLEAR STATION UNIT NQ.
1 In our review of reports submitted by licensees concerning malfunctions of diesel generators, we find that fn some cases the information available to the control room operator to indicate the operational status of the diesel generator may be imprecise and could lead ta misinterpretation.
This can be caused by the sharfng of a single annunciator station by alarms that indicate conditions that render a diesel generator unable to respond to an automatic emergency star t signal and alarms that only indicate a warning of abnormal, but not disabling, conditions.
Another cause can be the use of wording on an annunfcator window that does not specifically say that a dfesel generator is inoperable (i.e., unable at the time to respond to an automatic emergency start signal) when fn fact it fs inoperable for that purpose.
We, therefore, request that you i evfew the alarm circuitry and diesel generator control circuitry for the diesel generators at, your facility to determine hoss each conditi'on that renders a diesel generator unable to respond to an automatic emergency star t signal fs alarmed in the control room.
These conditions include not only the trips that lock out the diesel generator start and require manual reset, but also control s<vi tch or mode snitch posf tfons that block automatic start, loss of control voltage, insufficient star ting air pressure or battery, voltage, etc.
This review should consider all aspects of possible diesel generator operational conditions, for example test conditions and operation from local control stations.
One area of particular concern is the unreset condition follorfing a manual stop at the local station which terminates a diesel generator. test prior to resetting the diesel generator controls for enabling subsequent automatic operation.
Please respond within 45 days of your receipt of this 'letter by nrovidfno the followfna information:
DrrIcE~
SURNAME&
DATE~
NRC FORM 318 (9.76)
NRCM 0240 4 v. s. ODYERNMEMT PRIMTINS orrlcEI fora-asaasa
l "Y
V Niagara flohawk Power Corporation 2 (a) all conditions that render the diesel generator incapable of responding to an automatic emergency star t signal as discussed above; I
(b) the wording on the annunicator window in the control room that is alarmed for each of the conditions identified in (a);
(c) any other alarm signals that also cause the same annunicator to alarm; (d) any condition that renders the diesel:generator incapable of responding to an automatic emergency start signal which is not alarmed in the control roe';
and (e) any proposed modifications resulting from this evaluation.
Sincerely, George Lear, Chief Operating Reactors Branch 83 Division of Operatinq Reactors, DISTRIBUTION:
Docket NRC PDR
'Local PDR ORB¹3 Rdg TJCarter GLear SNowicki TWambach OELD OI8IE (3)
DEisenhut TBAbernathy JRBuchanan ACRS (16)
Fi1e Xtra Copies cc:
Arvin E. Upton, Esquire
- LeBoeuf, Lamb, Leiby 8 flacRae 1757 H Street, H. H.
Washington, D. C.
20036 Anthony Z. Roisman, Esquire
- Roisman, Kessler and Cashdan 1025 15th Street, N.
W.
5th Floor Washington, D. C.
20005 t1r. Eugene G. Saloga, Applicant Coordinator Nine Nile Point Energy 'Information Center P-. 0.
Box 81
- Lycoming, Hew York 13093 errIcc~
SVRNAMC~
ORB¹1 TWambach OATc~
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/77 NRC FORhf 318 (9-76) NRCM 0240 ORB¹3 SNowicki 3r K RB¹3 GLear ~
A V, S, OOVCRNMCNT PRINTINO OrrICCI IDTS 025&24
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