41 
(b)  carried out by or on behalf of— 
(i)  the national system operator, 
(ii)  a person holding a transmission licence, 
(iii)  a person holding a distribution licence, 
(iv)  a person holding a licence under section 7 and 7ZA of the Gas Act 1986(a), 
(v)  an LNG import or export facility as defined in section 48 of the Gas Act 1986(b), or 
(vi)  a person holding a network licence under section 8 of the Railways Act 1993(c), 
where they have travelled to the United Kingdom for the purposes of their work. 
(2)  For the purposes of sub-paragraph (1)— 
(a)  “distribution licence” means a licence granted unde r section 6(1)(c) of the Electricity Act 
1989(d); 
(b)  “essential or emergency works” includes commissioni ng, inspections, maintenance, 
repairs, and asset replacement activities; 
(c)  “national system operator” means the person operati ng the national transmission system 
for Great Britain; 
(d)  “network”, in sub-paragraph (1)(a)(v) and (vi), has  the meaning given in section 83(1) of 
the Railways Act 1993(e); 
(e)  “transmission licence” means a licence granted unde r section 6(1)(b) of the Electricity 
Act 1989; 
(f)  “electricity interconnector”, “generating station” and “transmission system” have the 
meanings given in section 64(1) of the Electricity Act 1989(f). 
24. —(1) A person who is— 
(a)  nuclear personnel, and who is essential to the safe  and secure operations of a site in 
respect of which a nuclear site licence has been granted; 
(b)  a nuclear emergency responder; or 
(c)  an agency inspector. 
(2)  For the purposes of sub-paragraph (1)— 
(a)  “agency inspector” has the meaning given in section  1(1) of the Nuclear Safeguards Act 
2000(g); 
(b)  “nuclear emergency responder” means a person provid ing assistance to the United 
Kingdom in accordance with the Convention on Assist ance in the Case of a Nuclear 
Accident or Radiological Emergency done at Vienna o n 26 September 1986, who has 
been duly notified to and accepted by the United Ki ngdom, where the United Kingdom 
has requested assistance under that Convention; 
(c)  “nuclear personnel” means — 
(i)  a worker who is employed to carry out work on or in  relation to a site in respect of 
which a nuclear site licence has been granted, or 
(ii)  an employee of the Nuclear Decommissioning Authority(h); 
                                                                                                                                            
(a) 1986 c. 44. Section 7ZA was inserted by section 1 49(6) of the Energy Act 2004. 
(b) The definition was inserted by S.I. 2011/2704. 
(c) 1993 c. 43; there are amendments to section 8 but  none is relevant. 
(d) 1989 c. 29. 
(e) There are amendments to section 83(1) but none is  relevant. 
(f) The definition of “electricity interconnector” wa s inserted by section 147(7) of the Energy Act 2004 . The definition of 
“transmission system” was substituted by paragraph 15 of Schedule 19 to the 2004 Act. 
(g) 2000 c. 5. 
(h) The Nuclear Decommissioning Authority was establi shed by section 1 of the Energy Act 2004.