ML19345E504
| ML19345E504 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 05/24/1977 |
| From: | Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Desiree Davis Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8102040714 | |
| Download: ML19345E504 (4) | |
Text
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,gg Att: Mr Don K Davis, Acting Branch Chief Operating Reactor Branch No 2 US Nuclear Regulator / Commission Washington, DC 20555 DOCKET 50-155 - LICEI;SE DPR BIG ROCK POINT PLANT - REVIEW OF DIESEL ALARM AND CONTROL CIRCUITRY By letter dated April 7, 1977 Consumers Power Company was requested to review the diesel generator alarm and control circuitrj at Big Rock Point, and to provide specific infor=ation concerning this review.
The purpose of this letter is t,c provide the requested data.
Item A List all conditions that render the diesel generator incapable of responding to an auto =atic energency start signal.
Resconse A The following conditions render the ilesel generstcr incapable of responding to an auto =atic emergency start signal:
1.
Emergency power auto selector switch (control room) in the "off" position.
2.
The power source for h80 V Bus 2B emergency power system cpen or unavailable (RDS-UPS-A, 17.5 V d-c, CB-12).
3 Emer, ency hesel generator engine control switch (local) in the " manual" or "off" pctition.
i h.
The alara conditions / trips listed below require resetting at the local control panel or diesel engine housing:
a.
b.
Lov lube oil pressure, c.
High jacket water temperature.
d.
Generator overcurrent.
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NOTE: The overspeedLtrip also requires manual reset at the governor in addition to the-common alarm reset.
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-Item B Provide. the wording on the annunciator vindow in the' control room that is alarmed for each of the conditions identified in Item' A.
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. Response B
- There is no alarm indication provided for Conditions 1 and 2 specified in Response A. - For Conditions 3 and h of Response A, the annunciator wording is as follows:
"fMERGENCY GENERATOR ENGINE TROUBLE."
4 Item C-t
- List any other alarm signals that also cause the same annunciator to alarm.
l Respense C' The following alar =s/ trips utilize the same annunciator:
j 1.
E:ergency diesel generator battery undervoltage.
4 2.~
Deergency-diesel generator low room air temperature.
3.
Ecergency diesel generator fuel tank lov level.
h.
Emergency diesel gener, tor overcurrent ' rip.
Item D 1
List' any condition that renders the diesei cenerator incapable of responding to.
I b
tut automatic emergency start signal which is not alarmed in the control room.
. Response D i
As. indicated in Response A, the two conditions that apply are:
(1) The emergency power auto selector switch in the "off" position; and (2) the power source for 1-480 V Bus 2B emergency power system (RDS-UPS-A,125 V d-c, CB-12) open or u, avail-q able. 'For this latter condition, it should be noted that if power is lost o e to -
charger / battery malfunction, the reactor depressurization system annunciators vill alarm, and,. if power is lost due to circuit breaker CB-12 opening, indication is available through the loss of position light on the emergency generator air cir-l cuit breakers.
i Item E Provide any proposed.modific?tions reaulting from this evaluation.
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- Response E An-alarm relay will be added to the h80 V Bus 2B to alert the operator if
.(1) the 125 V d-c is lost for any reacon and (2) if.the emergency power auto
. selector switch is left in the "off position. The relay contacts vill be added to the same anniinciator that signals engine start failure. The annun-ciator legend vill read as follows:
" EMERGENCY GENERATOR START /COUTROL -
FAILURE."
Although the "EMERGEICY GENERATOR EiGINE TROUBLE" alarm annunciator serves various.' actions, no modifications are deemed necessary. This evaluation is
. based on several factors. First, the operator can readily determine if the alarm is associated with a diesel trip. condition by observing the diesel gen-erator output voltage, indicated.on a seter near the annunciator.
- Second,
- operator action associated with either an alarm or trip condition is specific
^
and is. contained in the applicable "ala2m" or "off-normal" procedure.
- Finally, the alarm conditions ;hJ. could result in auto-start failure remain in an alar =ed state until tie condition is corrected.
Thus, Consu=ers Power Company
- concludes that the sep _ ration of diesel generator annunciator circuits and sig-nals existing at Big Rock Point after the proposed modification vill clearly define any potential diesel generator response problem, and that the probability of an operator misinterpreting any condition vill not be appreciably enhsnced by further separation.
By the Co==ission's Memo and Order dated May 26, 1976 Consumers Power Company was required to modify some of the trips associated with the diesel generator.
These modifications have not yet been implemented.
However, the annunciators t
and-circuitry discussed above vill not be affected in the context discusaed by
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this letter once the required modifications are completed.
N David A Bixel Nuclear Licenring Administrator CC: JGKeppler, USNRC
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