| MCMANUS, Melissa Angela ACTIVE | Secretary | 07 Jun 2026 | | | | Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, England |
| MATSUMOTO, Yoshiaki ACTIVE | Director | 01 Oct 2024 | | Japan | October 1971 | 5-2-1 Ueno, Taito-Ku, Tokyo, Japan |
| MIDDLEHURST, Ciara Ann ACTIVE | Director | 01 Apr 2025 | | England | September 1980 | Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, England |
| NARITA, Teppei ACTIVE | Director | 01 Apr 2024 | | Japan | August 1974 | 4-2, Ohtemachi 1-Chome, Tokyo, 100-8088, Japan |
| PEATTIE, David Keith ACTIVE | Director | 01 Jul 2017 | | England | August 1954 | Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, England |
| RODGERS, Haydn Scott ACTIVE | Director | 01 Oct 2025 | | Scotland | December 1985 | Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, England |
| ROULLEAUX DUGAGE, Olivier ACTIVE | Director | 01 Jun 2024 | | France | January 1983 | Orano Nps, 23 Place De Wicklow, Montigny-Le-Bretonneux, 78180, France |
| WHITTARD, Ben ACTIVE | Director | 12 Nov 2024 | | England | October 1985 | Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, England |
| BUKHARI, Khalil RESIGNED | Secretary | 04 Mar 2020 | 03 Jan 2024 | | | Hinton House, Birchwood Park Avenue, Birchwood, Warrington, WA3 6GR, England |
| GREEN, Peter Derrick RESIGNED | Secretary | | 09 Apr 1992 | | | 25 Thelwall New Road, Thelwall, Warrington, Cheshire, WA4 2JG |
| HODGSON, Helen Elizabeth RESIGNED | Secretary | 01 Apr 2008 | 04 Mar 2020 | | | 10, Brierydale Lane, Stainburn, Workington, Cumbria, CA14 4UH |
| SHUTTLEWORTH, Alvin Joseph RESIGNED | Secretary | 28 Jul 1999 | 01 Apr 2008 | | | Oaklea 35 Teddington Close, Appleton, Warrington, Cheshire, WA4 5QG |
| SYMONDS, David Richard RESIGNED | Secretary | 09 Apr 1992 | 28 Jul 1999 | | | 12 Ellenrod Drive, Norden, Rochdale, Lancashire, OL12 7PS |
| VADIYA, Mehboob RESIGNED | Secretary | 04 Jan 2024 | 07 Jun 2026 | | | Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, England |
| ASAMI, Kazuaki RESIGNED | Director | 31 Mar 2011 | 30 Sep 2011 | Japan | March 1960 | 4-2, Ohtemachi 1-Chome, Chiyoda-Ku, Tokyo, 100-8088, Japan |
| ASAZUMA, Ichiro RESIGNED | Director | 16 Jul 2010 | 21 Apr 2011 | Japan | January 1959 | 1-3, Uchisaiwai-Cho, I-Chome, Tokyo, Japan, 100-8560, Japan |
| AYLMORE, Linda Mary RESIGNED | Director | 12 Jun 2023 | 26 Apr 2024 | England | July 1970 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| BONSER, David Richard RESIGNED | Director | 18 Dec 2003 | 11 Dec 2006 | England | April 1949 | The Old Dairy, South Town Road, Medstead, Alton, Hampshire, GU34 5PP |
| BROWN, Alastair Aitken RESIGNED | Director | 23 Jul 2008 | 01 Jan 2018 | England | February 1965 | Hinton House, Risley, Warrington, Cheshire, WA3 6AS, England |
| BUCHAN, Peter George RESIGNED | Director | 20 May 2015 | 11 Nov 2024 | England | March 1970 | Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, England |
| CHAMBERLAIN, Leslie Neville RESIGNED | Director | | 02 Oct 1999 | England | October 1939 | Oaklands, 2 The Paddock Hinderton Road, Neston, Cheshire, CH64 9PH |
| CLARKE, John Simon RESIGNED | Director | 20 Dec 2006 | 30 Jun 2017 | United Kingdom | February 1959 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, United Kingdom |
| COUTURE, Jacques RESIGNED | Director | | 21 Jul 1993 | | July 1922 | 139 Rue De Longchamp, 922000 Neuilly, S/Seine, FOREIGN, France |
| CROWTHER, Mark RESIGNED | Director | 01 Jan 2018 | 27 Sep 2018 | England | April 1964 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| DAVIES, Michael Derek RESIGNED | Director | 16 Jul 2003 | 19 Jul 2005 | | June 1959 | 28 Amberleigh Close, Warrington, Cheshire, WA4 4TD |
| DE AGOSTINI, Frederic RESIGNED | Director | 31 Jul 2016 | 01 May 2019 | France | October 1964 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| DELAUNAY, Eric RESIGNED | Director | 01 May 2019 | 01 Nov 2021 | France | April 1963 | 1, Rue Des Herons, Tn International, Montigny Le Bretonneux, 78180, France |
| DUNCAN, Colin Douglas RESIGNED | Director | 28 Jul 1999 | 20 Apr 2001 | | September 1954 | 48 Knutsford Road, Grappenhall, Warrington, Cheshire, WA4 2PB |
| EDWARDS, John RESIGNED | Director | 16 Jul 2009 | 31 Mar 2012 | England | May 1949 | Pelham House, Pelham Drive, Calderbridge, Seascale, Cumbria, CA20 1DB, England |
| FICHEFEUX, Benoît Marie Paul RESIGNED | Director | 06 May 2012 | 31 Jul 2016 | France | June 1972 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, United Kingdom |
| FUJIE, Takao RESIGNED | Director | 19 Jul 2000 | 18 Jul 2002 | | July 1935 | 2-6-5 Minami-Ogikubo, Suginami-Ku, Tokyo, 167, FOREIGN, Japan |
| FUJIE, Takao RESIGNED | Director | 23 Jul 1997 | 23 Jul 1998 | | July 1935 | 2-6-5 Minami-Ogikubo, Suginami-Ku, Tokyo, 167, FOREIGN, Japan |
| FUJIOKA, Atsushi RESIGNED | Director | 01 Oct 2017 | 31 Mar 2019 | Japan | March 1965 | 7-1 Nihonbashi, 2-Chome, Chuo-Ku, Tokyo, 1036060, Japan |
| GREAVES, Alaine Louise RESIGNED | Director | 19 Jul 2005 | 17 Feb 2023 | England | January 1974 | Hinton House, Risley, Warrington, Cheshire, WA3 6AS, United Kingdom |
| HAMMOND, Alison Kristine RESIGNED | Director | 18 Feb 2023 | 12 Jun 2023 | Wales | November 1978 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| HARDING, Christopher George Francis, Sir RESIGNED | Director | | 30 Jun 1992 | | October 1939 | Flat 3, 180 Brompton Road, London, Greater London, SW3 1HL |
| HAYLES, John Malcolm RESIGNED | Director | | 02 Aug 1994 | | September 1929 | Langdale 3 Rectory Close, Flint, Clwyd, CH6 5NH |
| HIROSE, Masayoshi RESIGNED | Director | 30 Sep 2020 | 01 Apr 2022 | Japan | June 1968 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| HOKARI, Hiroshi RESIGNED | Director | 08 Apr 2013 | 30 Sep 2014 | Japan | October 1954 | 1-8-11, Harumi, Chuo-Ku, Tokyo, 1048610, Japan |
| IWABA, Shinji RESIGNED | Director | 19 Jul 1995 | 23 Jul 1997 | | June 1935 | 2-29-6 Shakii-Machi, Nerima-Ku Tokyo, Japan, FOREIGN |
| JACKSON, Kenneth George RESIGNED | Director | | 01 Oct 1994 | | May 1946 | La Vallee, Maupertuis, 50410, France |
| JEAN LUC, Andrieux RESIGNED | Director | 21 Dec 2005 | 10 Feb 2009 | | January 1954 | 21 Avenue General Leclarc, Paris, 75014, FOREIGN, France |
| JEAN-PIERRE, Giraud RESIGNED | Director | 21 Jul 1993 | 23 Sep 1997 | | December 1934 | 25 Rue De Montual, 78160 Marly Le Roi, France |
| JERVIS, Mark Christopher RESIGNED | Director | 23 Jul 2008 | 16 Oct 2017 | England | February 1960 | Hinton House, Risley, Warrington, Cheshire, WA3 6AS |
| KATAOKA, Noboru RESIGNED | Director | 30 Sep 2014 | 21 Apr 2015 | Japan | July 1960 | Sojitz Corporation, 1-1 Uchisaiwaicho 2-Chome, Chiyoda-Ku, Tokyo, Japan |
| KISHIDA, Tetsuji RESIGNED | Director | 16 Jul 2003 | 15 Jul 2004 | | February 1941 | 5-7-30, Oriono, Sumiyoshi-Ku, Osaka, 558-0032, FOREIGN, Japan |
| KOSAKA, Shinzo RESIGNED | Director | 15 Jul 2004 | 21 Dec 2005 | | September 1954 | 5-57-3 Someino, Sakura-Shi, Chiba 285-0831, Japan |
| KUWAHARA, Kazumasa RESIGNED | Director | 23 Jul 2008 | 31 Mar 2011 | Japan | March 1955 | 5-19-8 Sakaecho, Tachikawa, Tokyo 190-0003, Japan |
| KYBIRD, Seth RESIGNED | Director | 16 Oct 2017 | 01 Apr 2025 | England | September 1977 | Hinton House, Birchwood Park Avenue, Birchwood, Warrington, WA3 6GR, England |
| LANDON, David RESIGNED | Director | 06 May 2012 | 20 Apr 2015 | United Kingdom | September 1962 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, United Kingdom |
| LAYCOCK, John Hugh Spencer RESIGNED | Director | 19 Jul 1995 | 17 Jun 1997 | | February 1953 | 4 Mayfield Court, Cherry Lane, Lymm, Cheshire, WA13 0PR |
| LECKIE, Michael Charles RESIGNED | Director | 07 Jun 2024 | 30 Sep 2025 | England | December 1965 | Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, England |
| LENAIL, Bernard Marcel RESIGNED | Director | 23 Sep 1997 | 15 Jul 2004 | | April 1938 | 1 Square Corneille, Voisins-Le-Bretx, France, 78960 |
| LOUGHLIN, Christopher RESIGNED | Director | 01 Sep 1992 | 31 May 2002 | | August 1952 | Billiard Hall, Duddon Valley, Broughton In Furness, Cumbria, LA12 7DR |
| LOUVET, Thibault RESIGNED | Director | 01 Nov 2021 | 01 Jun 2024 | France | July 1977 | 23, Place De Wicklow, 78180 Montigny-Le-Bretonneux, 78180, France |
| MATSUDA, Toru RESIGNED | Director | 30 Jun 2023 | 30 Sep 2024 | Japan | August 1971 | 3-6-16, Nakanoshima, Kita-Ku, Osaka City, Osaka, Japan |
| MCLAUGHLAN, William Allison RESIGNED | Director | | 01 Sep 1992 | | October 1936 | 6 Beadnell Drive, Penketh, Warrington, Cheshire, WA5 2EG |
| MILLER, Malcolm Lambie RESIGNED | Director | 24 Jul 2001 | 16 Jul 2009 | England | June 1948 | 31 Hall Park, Lancaster, Lancashire, LA1 4SH |
| MISAWA, Yoshimasa RESIGNED | Director | 21 Apr 2015 | 30 Sep 2017 | Japan | November 1965 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| MOCHIZUKI, Masaomi RESIGNED | Director | 21 Apr 2011 | 30 Sep 2012 | Japan | February 1955 | Mitoshiro Building, 1-1 Kanda - Mitoshiro-Cho, Chiyoda-Ku, Tokyo, Japan |
| MOCHIZUKI, Masaomi RESIGNED | Director | 23 Jul 2008 | 16 Jul 2010 | Japan | February 1955 | 5-13-25, Katasa, Fugisawa, Kanagawa Pr, 251-0032, Japan |
| MORIMOTO, Hiroshi RESIGNED | Director | 11 Jul 2006 | 23 Jul 2008 | | March 1943 | 1459-4, Hyouge, Katsuragi, Nara 639-2154, Japan |
| MUKAI, Jun-Ichiro RESIGNED | Director | 20 Jul 1994 | 18 Jan 1995 | | February 1936 | 6-1 1-Chome Ohtemachi, Chiyoda-Ku, Tokyo, 100, Japan |
| MURANO, Hirokazu RESIGNED | Director | 21 Dec 2005 | 23 Jul 2008 | | December 1950 | 1-5-B606 Tsutsujigaoka, Aoba-Ku, Yokohama-Shi 227-0055, Japan |
| MURANO, Hirokazu RESIGNED | Director | 12 Jul 1999 | 03 Dec 1999 | | December 1950 | B 606 1/5 Tsutsujigaoka Aoba Ku, Yokohama Shi, Kanagawa Pref, 227 0051, Japan |
| NAGASE, Takuma RESIGNED | Director | 01 Oct 2023 | 31 Mar 2024 | Japan | August 1968 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| NISHIO, Hiroki RESIGNED | Director | 01 Apr 2022 | 30 Sep 2023 | Japan | September 1971 | 1-1, Uchisaiwaicho 2-Chome, Chiyoda-Ku, Tokyo, Japan |
| OSADA, Hideki RESIGNED | Director | 18 Jul 2002 | 16 Jul 2003 | | November 1940 | 2-3-13-101, Nishinomiya, Hyogo, 6620832, Japan |
| PRICE, Stanley Michael RESIGNED | Director | 17 Jun 1997 | 16 Jul 2003 | | February 1949 | Beck Lodge, Ireby, Carlisle, Cumbria, CA5 1HE |
| PRYOR, Charles Wingfield RESIGNED | Director | 18 Jul 2002 | 30 Sep 2003 | | December 1944 | Flat 1 21 Egerton Gardens, London, SW3 2DF |
| READLE, Peter Howard RESIGNED | Director | 01 Oct 1994 | 23 Jun 1997 | | August 1948 | 190 Urmston Lane, Stretford, Manchester, Lancashire, M32 9DH |
| ROBINSON, Mark George RESIGNED | Director | 19 Dec 2002 | 23 Jul 2008 | | May 1959 | 18 Cholmondeley Rise, No Mans Heath, Malpas, Cheshire, SY14 8DD |
| RYCROFT, Jeremy John Roland RESIGNED | Director | 03 Dec 1999 | 01 Dec 2007 | | May 1948 | Holwood House, Goosnargh, Preston, PR3 2WD |
| SHIRATO, Ryoichi RESIGNED | Director | 15 Jul 2004 | 19 Jul 2005 | | July 1938 | 2-32-4 Matsubara, Setagaya-Ku, Tokyo 156-0043, FOREIGN, Japan |
| SUMIYA, Shigeru RESIGNED | Director | 30 Sep 2011 | 08 Apr 2013 | England | July 1957 | 1-8-11, Harumi, Chuo-Ku, Tokyo 104-8610, 104-8610, Japan |
| SUTANI, Hiroshi RESIGNED | Director | 01 Oct 2021 | 30 Jun 2023 | Japan | June 1967 | 3-6-16, Nakanoshima, Kita-Ku, Osaka-City, Osaka, Japan |
| SUZUKI, Tatsuo RESIGNED | Director | | 13 Jul 1994 | | April 1928 | 4-2-20 Hamadayama, Suginami-Ku, Tokyo, FOREIGN, Japan |
| TAKEKURO, Ichiro RESIGNED | Director | 19 Jul 2005 | 11 Jul 2006 | Japan | March 1946 | 55-3 Okagami-Aso-Ku, Kawasaki-Shi, Kanagawa Prefecture 215-0027, Japan |
| TAKIUE, Hiroaki RESIGNED | Director | 01 Oct 2018 | 30 Sep 2021 | Japan | October 1963 | The Japan Atomic Power Company, 5-2-1, Ueno, Taito-Ku, Tokyo, Japan |
| THOMAS, Alastair Barclay RESIGNED | Director | 23 Jul 1997 | 05 Nov 2002 | U K | June 1948 | 270 Hardhorn Road, Poulton Le Fylde, Lancashire, FY6 8DW |
| TISSEAU DES ESCOTAIS, Jean Baptiste RESIGNED | Director | 15 Jul 2004 | 21 Dec 2005 | | February 1965 | 17 Rue Gabriel, Versailles, 78000, France |
| TOBITA, Tadanori RESIGNED | Director | 01 Apr 2019 | 30 Sep 2020 | Japan | November 1971 | 7-1, Nihonbashi 2-Chome, Chuo-Ku, Tokyo, Japan |
| TOKUNAGA, Yoshihisa RESIGNED | Director | 10 Jul 2015 | 30 Sep 2018 | Japan | October 1964 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| TOMONO, Katsuya RESIGNED | Director | 23 Jul 1998 | 19 Jul 2000 | | August 1935 | 28-4 Hongoudai 2 Chome, Sakae Ku, Yokohama, Kanagawa, 247, Japan |
| TSUJI, Nobuo RESIGNED | Director | 23 Jul 1997 | 03 Dec 1999 | | September 1943 | 5-9-54 Miyazaki Miyamae Ku, Kawasaki Shi Kanawanga 216, Japan, FOREIGN |
| UEMIYA, Shinichiro RESIGNED | Director | 03 Dec 1999 | 18 Nov 2002 | | October 1950 | 2-15-2 Oshitate-Cho, Huchu City, Tokyo, 183-0012, FOREIGN, Japan |
| UETAKE, Akihito RESIGNED | Director | 30 Sep 2012 | 10 Jul 2015 | Japan | July 1962 | 3-6-16, Nakanoshima, Kita-Ku, Osaka, 530-8270, Japan |
| WATTS, Graham Leonard RESIGNED | Director | 22 Jul 1992 | 30 Apr 1999 | | November 1945 | Westridge House, Blandys Hill, Kintbury, Berkshire, RG15 0UF |
| WEBER-GUEVARA, Catherine RESIGNED | Director | 12 Feb 2009 | 30 Mar 2012 | France | October 1958 | 2, Allee Auguste Rodin, 78955 Carrieres-Sous-Poissy, France |
| WESTCOTT, Michael William RESIGNED | Director | 02 Aug 1994 | 11 Jul 1995 | | November 1946 | Brookdale House 324 Bolton Road, Hawkshaw, Bury, Lancashire, BL8 4JL |
| YAMADA, Mitsuo RESIGNED | Director | | 28 Sep 1995 | | February 1943 | 2-15-6 Imaizumidai, Kamakura-Shi, Kanagawa, Pref, FOREIGN, Japan |
| YAMANA, Kunio RESIGNED | Director | 28 Sep 1995 | 23 Jul 1997 | | December 1945 | 21-6-509 2-Chome Himonya, Meguro-Ku, Tokyo, 152, Japan |
| YOKOI, Tetsuji RESIGNED | Director | 19 Dec 2002 | 15 Jul 2004 | | October 1946 | 1576-8 Kamikurata-Cho, Totsuka-Ku, Yokohama, 244-0816, Japan |