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{{#Wiki_filter:,*: .\ consumers POWIJ_ company General Offices: 1945 West Parnall Road. Jackson, Ml 49201 * (517) 788-1636 December 3, 1985 Director, Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 -LICENSE DPR-20 -PALISADES PLANT -FIRE PROTECTION  
{{#Wiki_filter:,*: .\ consumers POWIJ_ company General Offices: 1945 West Parnall Road. Jackson, Ml 49201 * (517) 788-1636 December 3, 1985 Director, Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 -LICENSE DPR-20 -PALISADES PLANT -FIRE PROTECTION  
-ADDITIONAL INFORMATION ON ISOLATION SWITCH INSTALLATION IN CONTROL CIRCUITS OF ESSENTIAL SAFE SHUTDOWN EQUIPMENT  
-ADDITIONAL INFORMATION ON ISOLATION SWITCH INSTALLATION IN CONTROL CIRCUITS OF ESSENTIAL SAFE SHUTDOWN EQUIPMENT  
...... Kenneth W Berry Director Nuclear Licensing On October 29, 1985 Consumers Power Company .submitted a request for approval to install isolation switches in the control circuits of essential alternate safe shutdown equipment as defined by 10CFR50.48 and Appendix R. In a telephone conversation on November 26, 1985, three questions wer.e asked by the NRC staff concerning the installation of the isolation Following are the NRC questions and Consumers Power Company responses.  
...... Kenneth W Berry Director Nuclear Licensing On October 29, 1985 Consumers Power Company .submitted a request for approval to install isolation switches in the control circuits of essential alternate safe shutdown equipment as defined by 10CFR50.48 and Appendix R. In a telephone conversation on November 26, 1985, three questions wer.e asked by the NRC staff concerning the installation of the isolation Following are the NRC questions and Consumers Power Company responses.
: 1. Question:
: 1. Question:
Will all leads which could* cause a spurious trip of the essential breakers be isolated from the breaker when the isolation switch is in the "local" isolation positio.n?
Will all leads which could* cause a spurious trip of the essential breakers be isolated from the breaker when the isolation switch is in the "local" isolation positio.n?
Response:
Response:
All leads which could cause a spurious trip of an essential breaker will.be isolated from the breaker when the isolation switch is in the "local" position.
All leads which could cause a spurious trip of an essential breaker will.be isolated from the breaker when the isolation switch is in the "local" position.
Attachment No 1 to this letter provides schematic diagrams which are typical of the isolation switch installations;  
Attachment No 1 to this letter provides schematic diagrams which are typical of the isolation switch installations;
: 2. Question:
: 2. Question:
Does the same handle fit all five isolation switches?
Does the same handle fit all five isolation switches?
Line 31: Line 31:
switches
switches
* Qnce tJ:ie handle' is fitted to a switch and the "'"swit-ch-is  
* Qnce tJ:ie handle' is fitted to a switch and the "'"swit-ch-is  
---local position, the handle cannot be removed until the switch is 'moved back to the remote position.  
---local position, the handle cannot be removed until the switch is 'moved back to the remote position.
: 3. Question:
: 3. Question:
Does the alternate fuse receive power from the same source as the primary fuse? If it does, is the primary fuse coordinated to blow before the control power supply breaker is tripped? OC 1185-0346-NL0.4 Director, Nuclear Reactor Regulation Palisades Plant Add'l Information  
Does the alternate fuse receive power from the same source as the primary fuse? If it does, is the primary fuse coordinated to blow before the control power supply breaker is tripped? OC 1185-0346-NL0.4 Director, Nuclear Reactor Regulation Palisades Plant Add'l Information  
Line 40: Line 40:
The control power breaker is located in the lC switchgear room.
The control power breaker is located in the lC switchgear room.
Director, Nuclear Licensing CC Administrator, Region III, USNRC NRC Resident Inspector  
Director, Nuclear Licensing CC Administrator, Region III, USNRC NRC Resident Inspector  
-Palisades Attachment OC1185-0346-NL04
-Palisades Attachment OC1185-0346-NL04
::-::---* .=:._-: -= Consumers Power Company Palisades Plant Docket 50-255 Attachment I to the December 3, 1985 letter entitled ADDITIONAL INFORMATION ON ISOLATION SWITCH INSTALLATION IN CONTROL CIRCUITS OF ESSENTIAL SAFE SHUTDOWN EQUIPMENT This attachment contains four schematic DRAWINGS NUMBERED 8-E-154, Sh. 1, Rev. 9; 8-E-139, Sh. 1, Rev. 16; 8-E-133, Sh. 1, Rev. 7 and 8-E-130, 1, Rev. 6 December 3, 1985  
::-::---* .=:._-: -= Consumers Power Company Palisades Plant Docket 50-255 Attachment I to the December 3, 1985 letter entitled ADDITIONAL INFORMATION ON ISOLATION SWITCH INSTALLATION IN CONTROL CIRCUITS OF ESSENTIAL SAFE SHUTDOWN EQUIPMENT This attachment contains four schematic DRAWINGS NUMBERED 8-E-154, Sh. 1, Rev. 9; 8-E-139, Sh. 1, Rev. 16; 8-E-133, Sh. 1, Rev. 7 and 8-E-130, 1, Rev. 6 December 3, 1985  
-------:::.--::  
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Revision as of 21:25, 25 April 2019

Responds to Request for Addl Info Re Installation of Isolation Switches in Control Circuits of Essential Alternate Safe Shutdown Equipment.Forwards Schematic Diagrams of Typical Installations.Fee Paid
ML18052A174
Person / Time
Site: Palisades 
Issue date: 12/03/1985
From: BERRY K W
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Office of Nuclear Reactor Regulation
Shared Package
ML18052A175 List:
References
NUDOCS 8512090191
Download: ML18052A174 (7)
v • d • e


Text

,*: .\ consumers POWIJ_ company General Offices: 1945 West Parnall Road. Jackson, Ml 49201 * (517) 788-1636 December 3, 1985 Director, Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 -LICENSE DPR-20 -PALISADES PLANT -FIRE PROTECTION

-ADDITIONAL INFORMATION ON ISOLATION SWITCH INSTALLATION IN CONTROL CIRCUITS OF ESSENTIAL SAFE SHUTDOWN EQUIPMENT

...... Kenneth W Berry Director Nuclear Licensing On October 29, 1985 Consumers Power Company .submitted a request for approval to install isolation switches in the control circuits of essential alternate safe shutdown equipment as defined by 10CFR50.48 and Appendix R. In a telephone conversation on November 26, 1985, three questions wer.e asked by the NRC staff concerning the installation of the isolation Following are the NRC questions and Consumers Power Company responses.

1. Question:

Will all leads which could* cause a spurious trip of the essential breakers be isolated from the breaker when the isolation switch is in the "local" isolation positio.n?

Response:

All leads which could cause a spurious trip of an essential breaker will.be isolated from the breaker when the isolation switch is in the "local" position.

Attachment No 1 to this letter provides schematic diagrams which are typical of the isolation switch installations;

2. Question:

Does the same handle fit all five isolation switches?

Response*:*

-"'Tlfe..;;:.-same'-.

switches

  • Qnce tJ:ie handle' is fitted to a switch and the "'"swit-ch-is

---local position, the handle cannot be removed until the switch is 'moved back to the remote position.

3. Question:

Does the alternate fuse receive power from the same source as the primary fuse? If it does, is the primary fuse coordinated to blow before the control power supply breaker is tripped? OC 1185-0346-NL0.4 Director, Nuclear Reactor Regulation Palisades Plant Add'l Information

-Isolation Switch December 3, 1985 Response:

The alternate fuse receives power from the same source as the primary fuse and provides the same coordination to the control power breaker as that which now exists with the present scheme for these breakers.

This scheme and compensatory actions are described below. 2 Industrial coordination of electrical circuits is based upon amperes for short circuit and time for overcurrent.

It is recognized that for a ground, the primary fuse will operate (or blow) in less than one-half cycle; however, for a low impedance fault, the latching mechanism for the control power breaker may be released within that time. Therefore, a statement will be included in the Operating Procedures which instructs the operator to check the control power breaker closed if no status lights appear on the 2400V breaker after the isolation switch is placed in the local position.

The control power breaker is located in the lC switchgear room.

Director, Nuclear Licensing CC Administrator, Region III, USNRC NRC Resident Inspector

-Palisades Attachment OC1185-0346-NL04

-::---* .=:._-: -= Consumers Power Company Palisades Plant Docket 50-255 Attachment I to the December 3, 1985 letter entitled ADDITIONAL INFORMATION ON ISOLATION SWITCH INSTALLATION IN CONTROL CIRCUITS OF ESSENTIAL SAFE SHUTDOWN EQUIPMENT This attachment contains four schematic DRAWINGS NUMBERED 8-E-154, Sh. 1, Rev. 9; 8-E-139, Sh. 1, Rev. 16; 8-E-133, Sh. 1, Rev. 7 and 8-E-130, 1, Rev. 6 December 3, 1985

:::.--::

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PALISADES P'_ANT CONSUMERS POWEh COMPANY SCHEMATIC O;AGRAM SOLENOIO OPERA:Eo CIRCUIT BREAKER jB-E-IJll SH. _,, [I I :**i : i ! ---, I. I ';I 1-.*. I I r: ,.

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