NEC Network Emergency Exercise - Exercise Prelude

2

Prelude

Review of the objectives of the exercise and actions taken

What was tested on each day of the exercise

Reporting

Next Steps and Contacts

3

Prelude – Industry Exercise

Overall Objectives

Test the overall framework of Network Gas Supply Emergency procedures

Test communications and understanding across industry.

Ensure continuity and alignment of process.

Testing transporters E3 procedures

Gas Act 1995Network Code

E/3 for detailed incident management

E/1 Network Gas Supply Emergency procedure

E/2 Local Gas Supply Emergency procedure

NEC Safety Case Transporters Safety Case

Gas Safety (Management Regulations 1996

4

Highlights.

The scenario was a progressive Gas Deficit Emergency with multiple events over the two days.

Day One. Stage 1 Declaration

Formation of the Network Emergency Management Team Communication with participants and System Operators Emergency Interruption

Stage 2 and Stage 3 Declaration and Communication Suspension of National Grid’s participation on the OCM as Residual Balancer NTS and LDZ VLDMC Firm Load shedding

Day Two Highlights. Completion of remaining Stage 3 Actions

Firm Load shedding of loads >25000 tpa

NGSE Stage 4 Isolation. Distribution Networks Isolation Plans

NGSE Stage 5 Restoration. NTS Restoration of Firm and Interruptible loads Distribution Networks Restoration Plans

5

Em

erg

ency

Arr

ang

emen

ts

NGSE Stages

NormalOperations

Marketsin normaloperation

NG role ofresidualbalancer

Normallevel ofreporting

Gas Balance

Alert

STAGE 1 STAGE 2

Suspend National Grids residual balancing role

Maximisebeach

Maximise storage

Public appeal

STAGE 3

Firm loadshedding insize order

Stage 5 - Restoration

STAGE 4

IsolationNTS and LDZ stock

Emergency Spec Gas

EmergencyInterruption

Public appeal

6

Uniform Network Code Obligations

Section Q – Emergencies

Section defined as fulfilling two purposes Requirements to be complied with by Users

Consequences of a Gas Supply Emergency in respect of application of the Code

Requirements for users. User contacts

Fax and Telephone Contact available 24hr / day as the primary user contact in a Gas Supply Emergency

Must have appropriate authority and responsibility

Site Contacts Large Firm Supply Points (AQ >25,000 therms) Interruptible Supply Points Power and Authority to comply with directions Contact details to be provided to xoserve for onward cascade to the relevant Transporters.

User Emergency procedures User should ensure alignment with section Q and emergency procedures Relevant personnel are familiar with the Emergency Procedures

7

Summary of Section Q Emergency Contact requirements.

  Large Firm

Interruptible   >25000 therms

>50000 therms

Site Manned 24 Hours

24 hour Emergency Contact and Job Title 1-5 1-5 1-4

Emergency Contact Telephone Number 1-5 1-5 1-4

Fax   1 1

Site Not Manned 24 Hours

24 hour Emergency Contact and Job Title 3-5 3-5 3-4

Emergency Contact Telephone Number 3-5 3-5 3-4

Fax   1 1

In addition to User contact details the User is responsible for providing the following site emergency contacts. (TPD Q 2.3 and 2.4)

8

Prelude reporting.

Whether the correct procedures were adhered to during the each stage.

Whether the notification method was correct according to the procedures.

Whether the information provided in any correspondence was legible and easy to understand.

Whether there was any confusion over what actions were required.

Whether or not there were enough people to implement the procedures required.

If the equipment was suitable for the job – was there enough equipment.

Ascertain the time taken to calculate the information required.

Ascertain whether the speed of response from the parties involved was reasonable.

If the Systems (including spreadsheets etc) were suitable for purpose.

9

Next Steps and Contacts

Target of December to produce the report for the HSE

All feedback is appreciated

Reports, observations and comments to:

gasops.emergencyplanning@uk.ngrid.com

Paul Youngman 01926 654151

Claire Baldwin 01926 653232

Lynn Crooks 01926 653223