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{{#Wiki_filter:javia Loveiess - LUUr inTO Neeas.wpa                                                                           rage 1 Information Needed for Risk Analysis of Loss of Offsite Power Events June 17, 2004
{{#Wiki_filter:javia Loveiess - LUUr inTO Neeas.wpa rage 1 Information Needed for Risk Analysis of Loss of Offsite Power Events June 17, 2004
: 1. Obtain copies of EOPs, AOPs, and SOP relating to the following events that were in effect at the time of the event
: 1.
: a.       Reactor trip and post trip
Obtain copies of EOPs, AOPs, and SOP relating to the following events that were in effect at the time of the event
: b.       LOOP
: a.
: c.       Station blackout
Reactor trip and post trip
: d.       Recovery of power to the switchyard
: b.
: e.       Recovery of power to the safety buses
LOOP
: f.       Battery life extension (load shedding)
: c.
: g.       Operation of alternate power sources, including blackstart sources
Station blackout
: 2. Obtain electrical distribution drawings showing:
: d.
: a.     Switchyard
Recovery of power to the switchyard
: b.       Safety buses and loads
: e.
: c.       BOP buses and loads
Recovery of power to the safety buses
: 3. List of operator actions (inside and outside the control room) and time estimates needed to recover:
: f.
: a.       Offsite power to the safety buses
Battery life extension (load shedding)
: b.       Start alternate power sources
: g.
: c.       Failed equipment
Operation of alternate power sources, including blackstart sources
: d.       Unavailable equipment in test and maintenance
: 2.
: 4. Plant configuration prior to the initiating event:
Obtain electrical distribution drawings showing:
: a.       List of equipment out-of-service for test and maintenance
: a.
: b.       Electrical power lineups
Switchyard
: c.       Battery lifetimes with proceduralized life extension (load shedding)
: b.
: d.       Reactor coolant pump seal type
Safety buses and loads
: e.       Backup/alternate power sources, including blackstart capability
: c.
: 5. Post trip conditions:
BOP buses and loads
: a.       Failed equipment
: 3.
: b.       Operator performance issues
List of operator actions (inside and outside the control room) and time estimates needed to recover:
: c.       Equipment performance issues (degradations)
: a.
: d.       Status of MFW and PCS (e.g., did the loss of power effect BOP buses?)
Offsite power to the safety buses
: e.       Lifting of PORV/SRV(s)
: b.
Start alternate power sources
: c.
Failed equipment
: d.
Unavailable equipment in test and maintenance
: 4.
Plant configuration prior to the initiating event:
: a.
List of equipment out-of-service for test and maintenance
: b.
Electrical power lineups
: c.
Battery lifetimes with proceduralized life extension (load shedding)
: d.
Reactor coolant pump seal type
: e.
Backup/alternate power sources, including blackstart capability
: 5.
Post trip conditions:
: a.
Failed equipment
: b.
Operator performance issues
: c.
Equipment performance issues (degradations)
: d.
Status of MFW and PCS (e.g., did the loss of power effect BOP buses?)
: e.
Lifting of PORV/SRV(s)


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uaviULais  
: 6. Offsite power recovery
- LUUr Inio iieeus.wpa_
: a.       Actual time when offsite power was stable (voltage and frequency) to carry loads to mitigate RCP seal and stuck open SRV LOCAs and to bring the plant to cold shutdown.
Menage z a uavio oveiess  
: b.       How and when would the control room know at the earliest time that offsite power was stable to carry these loads.
- Luur inio rieeas.wpo race 2
: c.       Actual time when offsite power was restored to the first safety bus.
: 6.
: d.       Estimate of the earliest time when offsite power could have been restored to the first safety bus given a postulated station blackout or core damage sequence, such as the loss of one bus and the failure of a key component powered from the remaining bus. NOTE: This time will be confirmed by electrical and human reliability experts based on information provided above.}}
Offsite power recovery
: a.
Actual time when offsite power was stable (voltage and frequency) to carry loads to mitigate RCP seal and stuck open SRV LOCAs and to bring the plant to cold shutdown.
: b.
How and when would the control room know at the earliest time that offsite power was stable to carry these loads.
: c.
Actual time when offsite power was restored to the first safety bus.
: d.
Estimate of the earliest time when offsite power could have been restored to the first safety bus given a postulated station blackout or core damage sequence, such as the loss of one bus and the failure of a key component powered from the remaining bus. NOTE: This time will be confirmed by electrical and human reliability experts based on information provided above.}}

Latest revision as of 00:33, 16 January 2025

Information Needed for Risk Analysis of Loss of Offsite Power Events
ML042960319
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 06/17/2004
From: David Loveless
NRC Region 4
To:
References
FOIA/PA-2004-0307
Download: ML042960319 (2)
v • d • e


Text

javia Loveiess - LUUr inTO Neeas.wpa rage 1 Information Needed for Risk Analysis of Loss of Offsite Power Events June 17, 2004

1.

Obtain copies of EOPs, AOPs, and SOP relating to the following events that were in effect at the time of the event

a.

Reactor trip and post trip

b.

LOOP

c.

Station blackout

d.

Recovery of power to the switchyard

e.

Recovery of power to the safety buses

f.

Battery life extension (load shedding)

g.

Operation of alternate power sources, including blackstart sources

2.

Obtain electrical distribution drawings showing:

a.

Switchyard

b.

Safety buses and loads

c.

BOP buses and loads

3.

List of operator actions (inside and outside the control room) and time estimates needed to recover:

a.

Offsite power to the safety buses

b.

Start alternate power sources

c.

Failed equipment

d.

Unavailable equipment in test and maintenance

4.

Plant configuration prior to the initiating event:

a.

List of equipment out-of-service for test and maintenance

b.

Electrical power lineups

c.

Battery lifetimes with proceduralized life extension (load shedding)

d.

Reactor coolant pump seal type

e.

Backup/alternate power sources, including blackstart capability

5.

Post trip conditions:

a.

Failed equipment

b.

Operator performance issues

c.

Equipment performance issues (degradations)

d.

Status of MFW and PCS (e.g., did the loss of power effect BOP buses?)

e.

Lifting of PORV/SRV(s)

uaviULais

- LUUr Inio iieeus.wpa_

Menage z a uavio oveiess

- Luur inio rieeas.wpo race 2

6.

Offsite power recovery

a.

Actual time when offsite power was stable (voltage and frequency) to carry loads to mitigate RCP seal and stuck open SRV LOCAs and to bring the plant to cold shutdown.

b.

How and when would the control room know at the earliest time that offsite power was stable to carry these loads.

c.

Actual time when offsite power was restored to the first safety bus.

d.

Estimate of the earliest time when offsite power could have been restored to the first safety bus given a postulated station blackout or core damage sequence, such as the loss of one bus and the failure of a key component powered from the remaining bus. NOTE: This time will be confirmed by electrical and human reliability experts based on information provided above.

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