ML19329D650
| ML19329D650 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/29/1977 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Rodgers J FLORIDA POWER CORP. |
| References | |
| NUDOCS 8003160273 | |
| Download: ML19329D650 (3) | |
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3 March 29,1977 DISIRIBUTION:
Angelo JFStolz Local PDR Docket No.: 50-30 ORB #4 Rdg.
TJCarter RWReid RIngram Florida Power Corporation CNelson i
ATTN: Mr. J. T. Rodgers, Assistant Vice President and Nuclear Project Manager TWambach P.O. Box 14042 Attorney, OELD St. Petersburg, Florf oa 33733 OIAE-3 DEisenhut Gentlemen:
TBAbernathy JRBUChanan RE: CRYSTAL RIVER UNIT NO. 3 ACRS-16
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Gray file l
In our review of reports subnitted by licensees concerning malfunctions of diesel generators, we find that in some cases the information availaole to the control room operator to indicate the operational status of the diesel generator may be imprecise and could lead to misinterpretation.
This can be caused by the sharing of a single annunciator station by alarms that indicate conditions that render a diesel generator unable to respond to an automatic emergency start signal and alams that only indice+.e a warning of abnormal, but not disabling, conditions. Another cause can be the use of wording on an annunicator window that does not specifically say that a diesel generator is inoperable (i.e., unable at the time to respond to an automatic emergency start signal) when in fact it is inoperable for that purpose.
We, therefore, request that you review the alarm circuitry and diesel generator control circuitry for the diesel generators at your facility to determine how each condition that renders a diesel generator unable to respond to an autwatic emergency start signal is alamed in the control room. These conditions include not only the trips that lock l
out the diesel generator start and reouf re manual reset, but also control switch or mode switch post tions that block autonatic start, loss of control voltage,. insufficient starting air pressure or
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battery voltage, etc. This review should consider all aspects of possible diesel generator operational conditions, for example test condi' ions and operation from local control stations. One area of pa*ticular concern is the unreset condition following a manual stop at the local station which teminates a diesel generator test prior to resetting the diesel generator controls for enabling subsequent automatic operation.
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Please respond within 45 days of your receipt of this letter by
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l providing the following infomation:
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Florida Power Corporation (a) all conditions that render the diesel generator incapable of responding to an automatic emergency start 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 cau'se the same annunicator to alarm; (d) any condition that renders the dies ~ l generator incapable of e
responding to an automatic emergency start signal which is not alarmed in the control room; and (e) any proposed modifications resulting from this evaluation.
Sincerely,
.lohn F. Stolz, Chief l
Light Water Reactors Branch #1 Division of Project Management cc: See next page l
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NRC FORM 310 (9 76) NRCM 0240 W u. s. sovannuamt emntine orrtes4 este -eas.s.4
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Florida Power Corporation CC:
Mr. S. A. Brandimore Vice President and General Counsel P.O. Box 14042 5'. Petersburg, Florida 33733
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