Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2019-04-29 — NY
Operator
Niagara Mohawk Power Corp
Cause
Incorrect Operation
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2019-04-29 15:14
Report number
Location
NY, OSWEGO
Narrative
On 4/29/2019 a routine annual performance test was conducted on a 90 psig regulator station, grs-824-228) in oswego, ny. Upon completion of the relief valve test, the crew left the station. Approx. 2 hours later the relief valve began venting gas. The relief valve associated with that regulator station vented gas from approx. 2:53 pm (14:53) until 3:47 pm (15:47). The abnormal operating condition (aoc) was detected by scada and communicated from the control center to field personnel. . Field personnel returned to the station and determined that the relief valve pilot had not been returned to the correct operating position and then corrected the condition. Volume of vented gas was approx. 3,650,000 cfh based on capacity of the valve. Outlet maop of the station is 90 psig. Relief valve setting was 94 psig (with maximum of 99 psig). No customers were impacted by this release of gas. (no outages nor overpressurization occurred.)
Detailed record list
Occurred At
2019-04-29 15:14:00
Year
2019
Report Received Date
2019-05-23 00:00:00
Iyear
2019.0
Report Number
20190052.0
Supplemental Number
32187.0
Report Type
Original Final
Operator Id
13480
Name
Niagara Mohawk Power Corp
Operator Street Address
300 Erie Boulevard West
Operator City Name
Syracuse
Operator State Abbreviation
NY
Operator Postal Code
13202
Local Datetime
2019-04-29 14:53:00
Location Street Address
270 George Washington Blvd.
Location City Name
Oswego City
Location County Name
Oswego
Location State Abbreviation
NY
Location Postal Code
13126
Location Latitude
43.453624
Location Longitude
-76.533052
Nrc Rpt Datetime
2019-04-30 17:14:00
Nrc Rpt Num
1244229
Commodity Released Type
Natural Gas
Unintentional Release
3650.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0.0
Incident Identified Datetime
2019-04-29 15:14:00
On Site Datetime
2019-04-29 15:45:00
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance (E.g. Value Or Regulator Station, Outdoor Meter Set)
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
District Regulator/metering Station
Material Involved
Steel
Release Type
Other
Release Type Details
Following Annual Performance Testing On Relief, Relief Valve Loading Pressure Was Not Returned To Correct Position And Allowed Loading Pressure To Gradually Decrease Until Main Valve Opened And Allow Gas To Vent.
Class Location Type
Class 3 Location
Est Cost Oper Paid
0.0
Est Cost Prop Damage
0.0
Est Cost Emergency
0.0
Est Cost Other
0.0
Est Cost Unintentional Release
8957.0
Prpty
8957.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
0.0
Accident Psig
85.78
Normal Psig
85.0
Mop Psig
90.0
Accident Pressure
Pressure Did Not Exceed Maop
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
Accident Identifier
Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations)
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
Control room operators correctly and promptly identified problem and communicated it to field personnel.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure
Operation Type
Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure
Related Failure Follow Ind
Yes
Category Type
Routine Maintenance
Operator Qualification Ind
Yes
Qualified Individuals
Yes, They Were Qualified For The Task(S)
Preparer Name
C****** B*****
Preparer Title
Principal Program Manager Gas Work Methods
Preparer Email
C*************@n***********.com
Preparer Telephone
6317703549
Authorizer Name
C****** B*****
Authorizer Title
Principal Program Manager Gas Work Methods
Authorizer Telephone
6317703549
Authorizer Email
C*************@n***********.com
Narrative
On 4/29/2019 a routine annual performance test was conducted on a 90 psig regulator station, grs-824-228) in oswego, ny. Upon completion of the relief valve test, the crew left the station. Approx. 2 hours later the relief valve began venting gas. The relief valve associated with that regulator station vented gas from approx. 2:53 pm (14:53) until 3:47 pm (15:47). The abnormal operating condition (aoc) was detected by scada and communicated from the control center to field personnel. . Field personnel returned to the station and determined that the relief valve pilot had not been returned to the correct operating position and then corrected the condition. Volume of vented gas was approx. 3,650,000 cfh based on capacity of the valve. Outlet maop of the station is 90 psig. Relief valve setting was 94 psig (with maximum of 99 psig). No customers were impacted by this release of gas. (no outages nor overpressurization occurred.)
| Occurred At | 2019-04-29 15:14:00 |
|---|---|
| Year | 2019 |
| Report Received Date | 2019-05-23 00:00:00 |
| Iyear | 2019.0 |
| Report Number | 20190052.0 |
| Supplemental Number | 32187.0 |
| Report Type | Original Final |
| Operator Id | 13480 PHMSA Enforcement |
| Name | Niagara Mohawk Power Corp |
| Operator Street Address | 300 Erie Boulevard West |
| Operator City Name | Syracuse |
| Operator State Abbreviation | NY |
| Operator Postal Code | 13202 |
| Local Datetime | 2019-04-29 14:53:00 |
| Location Street Address | 270 George Washington Blvd. |
| Location City Name | Oswego City |
| Location County Name | Oswego |
| Location State Abbreviation | NY |
| Location Postal Code | 13126 |
| Location Latitude | 43.453624 Google Maps OpenStreetMap |
| Location Longitude | -76.533052 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2019-04-30 17:14:00 |
| Nrc Rpt Num | 1244229 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 3650.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0.0 |
| Incident Identified Datetime | 2019-04-29 15:14:00 |
| On Site Datetime | 2019-04-29 15:45:00 |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance (E.g. Value Or Regulator Station, Outdoor Meter Set) |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | District Regulator/metering Station |
| Material Involved | Steel |
| Release Type | Other |
| Release Type Details | Following Annual Performance Testing On Relief, Relief Valve Loading Pressure Was Not Returned To Correct Position And Allowed Loading Pressure To Gradually Decrease Until Main Valve Opened And Allow Gas To Vent. |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 0.0 |
| Est Cost Prop Damage | 0.0 |
| Est Cost Emergency | 0.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 8957.0 |
| Prpty | 8957.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 0.0 |
| Accident Psig | 85.78 |
| Normal Psig | 85.0 |
| Mop Psig | 90.0 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | Yes |
| Accident Identifier | Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations) |
| 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 | Control room operators correctly and promptly identified problem and communicated it to field personnel. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure |
| Operation Type | Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure |
| Related Failure Follow Ind | Yes |
| Category Type | Routine Maintenance |
| Operator Qualification Ind | Yes |
| Qualified Individuals | Yes, They Were Qualified For The Task(S) |
| Preparer Name | C****** B***** |
| Preparer Title | Principal Program Manager Gas Work Methods |
| Preparer Email | C*************@n***********.com |
| Preparer Telephone | 6317703549 |
| Authorizer Name | C****** B***** |
| Authorizer Title | Principal Program Manager Gas Work Methods |
| Authorizer Telephone | 6317703549 |
| Authorizer Email | C*************@n***********.com |
| Narrative | On 4/29/2019 a routine annual performance test was conducted on a 90 psig regulator station, grs-824-228) in oswego, ny. Upon completion of the relief valve test, the crew left the station. Approx. 2 hours later the relief valve began venting gas. The relief valve associated with that regulator station vented gas from approx. 2:53 pm (14:53) until 3:47 pm (15:47). The abnormal operating condition (aoc) was detected by scada and communicated from the control center to field personnel. . Field personnel returned to the station and determined that the relief valve pilot had not been returned to the correct operating position and then corrected the condition. Volume of vented gas was approx. 3,650,000 cfh based on capacity of the valve. Outlet maop of the station is 90 psig. Relief valve setting was 94 psig (with maximum of 99 psig). No customers were impacted by this release of gas. (no outages nor overpressurization occurred.) |
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