ML18348A691

Response to Request for Additional Information Alarm and Diesel Generator Control Circuitry

ML18348A691
Person / Time
Site:	Palisades
Issue date:	05/16/1977
From:	Hoffman D Consumers Power Co
To:	Schwencer A Office of Nuclear Reactor Regulation
References
Download: ML18348A691 (3)

Text

.consumers

• Power company General Offices: 212 West Michigan Avenue, .Jackson, Michigan 49201

• Area Code 517 788-0 550 May 16, 1977 Director of Nuclear Reactor Regulation Att: Mr Albert Schwencer, Chief Operating Reactor Branch No 1 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 *- LICENSE DPR PALISADES FLA-WT DIESEL GENERATOR CONTROL CIRCUITRY Ai'ID ALARMS The following information is provided in response to your March 29, 1977 letter*

relating to alarm and diesel generator control circuitry for the Palisades Plant diesel generators .

• Item (a) 11 All conditions that render the diesel generator incapable of responding to an automatic emergency start signal .... "

Resi:::onse The following condition relays operate the shutdown relay*which renders the unit incapable of automatic start:

l. Generator differential relay.

2. Overcrank relay.

3. Jacket water temperature relay.

4. Overspeed relay.

5. Oil pressure relay.

6. Jacket water pressure relay.

7. Loss of direct current control relay .

• 2

• Item (b)

"The wording on the annunciator window in the control room that is alarmed for each of the conditions identified in (a). 11

Response

The control room annunciator windows and the condition in (a) above which operates them:

1. Diesel Generator Breaker Trip Generator differential relay.

2. Diesel Generator Fail To Start Overcrank relay.

3. Diesel Generator Trouble

a. Jacket water temperature relay.

b. Overspeed relay.

c. Oil pressure relay.

• d.

Item ( c)

Loss of d-c control power .

"Any other alarm signals that also cause the same annunciator to alarm. 11

Response

Other alarm signals which share the annunciators listed in (b) above:

l. Diesel Generator Breaker Trip Breaker contact position switch.

2. Diesel Generator Fail To Start None.

3. Diesel Generator Trouble

a. High lube oil differential pressure.

b. Low lube oil temperature.

c. High lube oil temperature.

d. Air supply tanks low pressure.

e. Jacket water level low.

f. Low lube oil level

g. Raw water pressure low.

h. Pr~lube pressure low.

....,:. ...... I '~~ ... . ,> * ..-- '

3

• Item (d) uAny condition that renders the diesel generator incapable of responding to an automatic emergency start signal which is not alarmed in the control room."

Response

The only condition which may prevent auto-start and which is not alarmed either locally or in the control room is jacket water pressure low.

Item (e)

"Any proposed modifications resulting from this evaluation."

Response

The jacket water -pressure will be alarmed at the local alarm panels and in the control room on Diesel Generator Trouble annunciator. The Diesel Generator Breaker Trip, Diesel Generator Fail To Start, and Diesel Generator Trouble annunciators will be c~anged to "red" lamps instead of 11 white. 11

• SEY'Ja~ David P Hoffman //

Assistant Nuclear Licensing Administrator CC: JGKeppler, USNRC