Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2017-10-28 — CA
Operator
Pacific Gas & Electric Co
Cause
Incorrect Operation
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2017-10-28 14:45
Report number
Location
CA
Narrative
On 10/28/17 at 14:45, relief valve m at pressure-limiting station 6ab on l300a mp 436.85 activated and began venting gas. The relief valve closed at 15:53. The maop of this section of l300a is 631 psig and the relief valve opened at 602 psig. The fire department responded to the relief valve activation. The initial investigation determined the relief valve activated below the set point of 615 psig. This incident is being reported due to the early activation of the relief valve and unintentional release of gas over 3mmcf. The incident was due to operator error. The operator input a regulation set point meant for pls4 into pls6 causing the pressure to rise and the over pressure protection relief valve to activate.
Detailed record list
Report Received Date
2017-11-16 00:00:00
Iyear
2017
Report Number
20170105
Supplemental Number
30189
Report Type
Supplemental Final
Operator Id
15007
Name
Pacific Gas & Electric Co
Operator Street Address
6121 Bollinger Canyon Rd.
Operator City Name
San Ramon
Operator State Abbreviation
CA
Operator Postal Code
94583
Local Datetime
2017-10-28 14:45:00
Location Latitude
36.70052
Location Longitude
-121.21127
Nrc Rpt Num
1194547
Nrc Rpt Datetime
2017-10-28 15:57:00
Commodity Released Type
Natural Gas
Unintentional Release
28500
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Relief Valve Activation, No Overpressure Excursion
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2017-10-28 14:45:00
On Site Datetime
2017-10-28 15:10:00
On Off Shore
Onshore
Onshore State Abbreviation
Ca
Onshore Postal Code
95075
Onshore City Name
Paicines
Onshore County Name
San Benito
Designated Location
Milepost
Designated Name
436.85
Pipe Fac Name
L300a
Segment Name
7947879
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Intrastate
System Part Involved
Onshore Regulator/metering Station Equipment And Piping
Item Involved
Valve
Valve Type
Relief Valve
Installation Year
2004
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Relief Valve Activation
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
589
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
85500
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Prpty
85500
Accident Psig
602
Mop Psig
631
Mop Cfr Section
192.619(A)(2)
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
Accident Identifier
Controller
Operator Type
Operator Employee
Investigation Status
No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate)
Investigation Status Details
The relief valve activated below the set point.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Pipeline Or Equipment Overpressured
Operation Type
Pipeline Or Equipment Overpressured
Related Failure Follow Ind
Yes
Category Type
Non-Routine Operating Conditions (Abnormal Operations Or Emergencies)
Operator Qualification Ind
Yes
Qualified Individuals
Yes, They Were Qualified For The Task(S)
Preparer Name
E*** B******
Preparer Title
Senior Program Manager
Preparer Email
E***@p**.com
Preparer Telephone
925-357-7889
Authorizer Name
S**** R*******
Authorizer Title
Manager Of Gas Ops Compliance And Risk
Authorizer Telephone
925-786-0267
Authorizer Email
G***@p**.com
Narrative
On 10/28/17 at 14:45, relief valve m at pressure-limiting station 6ab on l300a mp 436.85 activated and began venting gas. The relief valve closed at 15:53. The maop of this section of l300a is 631 psig and the relief valve opened at 602 psig. The fire department responded to the relief valve activation. The initial investigation determined the relief valve activated below the set point of 615 psig. This incident is being reported due to the early activation of the relief valve and unintentional release of gas over 3mmcf. The incident was due to operator error. The operator input a regulation set point meant for pls4 into pls6 causing the pressure to rise and the over pressure protection relief valve to activate.
| Report Received Date | 2017-11-16 00:00:00 |
|---|---|
| Iyear | 2017 |
| Report Number | 20170105 |
| Supplemental Number | 30189 |
| Report Type | Supplemental Final |
| Operator Id | 15007 PHMSA Enforcement |
| Name | Pacific Gas & Electric Co |
| Operator Street Address | 6121 Bollinger Canyon Rd. |
| Operator City Name | San Ramon |
| Operator State Abbreviation | CA |
| Operator Postal Code | 94583 |
| Local Datetime | 2017-10-28 14:45:00 |
| Location Latitude | 36.70052 Google Maps OpenStreetMap |
| Location Longitude | -121.21127 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1194547 NRC Report How to search |
| Nrc Rpt Datetime | 2017-10-28 15:57:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 28500 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Relief Valve Activation, No Overpressure Excursion |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2017-10-28 14:45:00 |
| On Site Datetime | 2017-10-28 15:10:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ca |
| Onshore Postal Code | 95075 |
| Onshore City Name | Paicines |
| Onshore County Name | San Benito |
| Designated Location | Milepost |
| Designated Name | 436.85 |
| Pipe Fac Name | L300a |
| Segment Name | 7947879 |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| System Part Involved | Onshore Regulator/metering Station Equipment And Piping |
| Item Involved | Valve |
| Valve Type | Relief Valve |
| Installation Year | 2004 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Relief Valve Activation |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 589 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 85500 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 85500 |
| Accident Psig | 602 |
| Mop Psig | 631 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | Yes |
| Accident Identifier | Controller |
| Operator Type | Operator Employee |
| Investigation Status | No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate) |
| Investigation Status Details | The relief valve activated below the set point. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Pipeline Or Equipment Overpressured |
| Operation Type | Pipeline Or Equipment Overpressured |
| Related Failure Follow Ind | Yes |
| Category Type | Non-Routine Operating Conditions (Abnormal Operations Or Emergencies) |
| Operator Qualification Ind | Yes |
| Qualified Individuals | Yes, They Were Qualified For The Task(S) |
| Preparer Name | E*** B****** |
| Preparer Title | Senior Program Manager |
| Preparer Email | E***@p**.com |
| Preparer Telephone | 925-357-7889 |
| Authorizer Name | S**** R******* |
| Authorizer Title | Manager Of Gas Ops Compliance And Risk |
| Authorizer Telephone | 925-786-0267 |
| Authorizer Email | G***@p**.com |
| Narrative | On 10/28/17 at 14:45, relief valve m at pressure-limiting station 6ab on l300a mp 436.85 activated and began venting gas. The relief valve closed at 15:53. The maop of this section of l300a is 631 psig and the relief valve opened at 602 psig. The fire department responded to the relief valve activation. The initial investigation determined the relief valve activated below the set point of 615 psig. This incident is being reported due to the early activation of the relief valve and unintentional release of gas over 3mmcf. The incident was due to operator error. The operator input a regulation set point meant for pls4 into pls6 causing the pressure to rise and the over pressure protection relief valve to activate. |
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