National_Energy_Board_Report Page446

No.

Conditions with initial ﬁlings due prior to commencing construction, or prior to

commencing construction of speciﬁed Project component(s)

CPCN

OC2

OC49

Temp

Pump1

Pump2

Tanks

Deact

Trans Mountain Expansion Project 2016

427

Burnaby Mountain tunnel option – rock mass and waste rock management

Trans Mountain must ﬁle with the NEB for approval,

at least 6 months prior to

commencing Burnaby Mountain tunnel construction activities

, the following

details on rock mass expected to be encountered during construction of the tunnel

between the Burnaby Terminal and the Westridge Marine Terminal:

a) the characterization of the rock mass quality;

b) waste rock management methods during construction and operations,

if applicable;

c) proposed acid rock mitigation measures, such as the treatment or disposal of

acid rock, if encountered;

d) the locations, sizes, and designs of all conﬁrmed waste rock disposal areas; and

e) plans for disposing any waste rock that is not expected to be stored in the

conﬁrmed waste rock disposal areas.

Power system protection for pump stations and terminals

Trans Mountain must ﬁle with the NEB the following details of its electrical power

system design for each pump station and each of the following: Westridge Marine

Terminal, Burnaby Terminal, Edmonton Terminal, and Sumas Terminal:

a) Descriptions of the overcurrent and ground fault protection schemes including:

a summary of coordination studies between the upstream and downstream

protective devices,

at least 3 months prior to commencing dry commissioning

;

ii) relay settings and time-current curves,

at least 3 months prior to commencing

dry commissioning

;

iii) the speciﬁcation of neutral grounding resistors,

at least 6 months prior to

commencing construction

;

iv) speciﬁcations of contactors, fuses, and circuit breakers,

at least 6 months prior

to commencing construction

; and

v) a description of other electrical protections, relay settings, and trip

characteristics,

at least 3 months prior to commencing dry commissioning

b) Consistent with the NEB’s Safety Advisory SA-2015-03, dated 4 May 2015,

least 6 months prior to commencing construction

, information conﬁrming

that Trans Mountain has performed the ground fault and arcing fault protection

designs for each pump station and terminal, including:

a means to clear ground faults without intentional time delay if the fault currents

exceed the design limit set by the neutral grounding resistance; and

ii) a means to block the stored energy from other running motors from feeding an

electrical fault in another motor running from the same bus.

This ﬁling must include a description of the ground fault and arcing fault protection

designs including the above measures.

At least 6 months prior to commencing construction

, either:

a written conﬁrmation that Trans Mountain determined during detailed design

that electrical faults will not exceed their design limits and migrate to an arcing

fault; or

ii) for a station or a terminal for which Trans Mountain determined during detailed

design that an electrical fault could exceed its design limit and migrate to an

arcing fault, the electrical conﬁguration of that station or terminal and the

additional equipment and devices that will be used to mitigate the adverse

eﬀects of such arcing faults.

d) Single-line diagrams of the electrical power systems,

at least 6 months prior to

commencing construction