ML20148F733
| ML20148F733 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 03/29/1977 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Groce R YANKEE ATOMIC ELECTRIC CO. |
| Shared Package | |
| ML20148F739 | List: |
| References | |
| NUDOCS 8011060716 | |
| Download: ML20148F733 (2) | |
Text
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M 2 91977 f} g
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-Docket-No. 50-29 TI;. ;; q 7"..
Yankee Atomic Electric Company ATTH: fir. Robert H. Groce.
5.g 1 Licensing Engineer 20 Turnpike-Road-
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.Westboro,'tiassachusetts 01581
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Gentlemen:
-RE: YANKEE-RCWE ATOMIC POWER STATION
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- a In our review of. reports submitted by licensees concerning malfunctions of diesel generators, we. find.that in some cases the infomation available
- D to the control roon 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 s =;
alarms that indicate conditions that render a diesel generator unable
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to respond to an automatic energency start signal and alams that only Another indicate a warning of abnomal, but not disabling, conditions.
3 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.
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We, therefore, request that you review the alarm circuitry and diesel b
generator control circuitry for the ciesel generators at your facility b
to detornine how each condition that renders a diesel generator unable to resnond to en autenatic energency start sicnal is alarmd in the These conditions include not only the trips that lock control room.
out the ciesel generator start cnd require nonual reset, but also
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control witch or node suitch positions that block autoestic start, 22 p
loss of control voltage, insuf ficient starting air pressure or This review should consider all aspects of
= batwry voltage, etc.
possible diesel generator operational conditions, for exanple test
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One area conditions and operation from local control stations.
of particular concern is the unreset condition following a nanual stop at the local Station which teminates a diesel cenerator test
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. prior to resetting the diesel generator controls for enabling subseouent autouatic operation.
f py Please respond within 45' days of your roccipt of this letter by 9
providing the following information:
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POOR QUAUTYJAGESI l
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Yankee Atomic Electric Conpany N 2 S 1977 E
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7 (a) all conditions that render the diesel generator incapable o[d g..
responding to an automatic energency,. start < signal as discu,sse
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above; the wording on the annunicator window in the control ro/
~(b) txn that is alarr.ed for each of the conditions identified in (t);
(c) any other alarn signals that also cause the same annunicator to alam; (d) any condition tho' renders the diesel generator incapable of
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i responding to an automatic energency start signal which is not L.
alarmed in the control roaa; and F.2=
(e) any proposed modifications resulting from this evaluation.
Sincerely,
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_9tiginal signed by
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A. Schwencer, Chief Operating Reactors Branch #1 ~
7 Division of Operating Reactors j
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See next page I
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DISTRIBUTION k
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