Culcheth Laboratories was a British metallurgical and nuclear research institute that researched the structural design of nuclear reactors and reactor pressure vessels in Culcheth, Cheshire, then in south Lancashire and now in the borough of Warrington.

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Culcheth Laboratories[1]
UKAEA Culcheth
Location within Cheshire
Former names	Reactor Materials Laboratory
Alternative names	Culcheth Laboratory
General information
Type	Metallurgical Research Centre
Location	former South Lancashire
Address	Wigshaw Lane, Culcheth and Glazebury, WA3 4NE
Coordinates	53.4517°N 2.5292°W / 53.4517; -2.5292
Elevation	35 m (115 ft)
Completed	1950
Demolished	1995
Client	UKAEA
Owner	UKAEA

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The Reactor Materials Laboratory was established at Culcheth in 1950.^[2] The UKAEA's Safety and Reliability Directorate (SRD)^[3] stayed at Culcheth until 1995.

It carried out work on reactors for the British civil and military (submarine fleet) nuclear energy programmes, investigating metallurgy. In the first ten years, it carried out research on materials for fast breeder reactors; it was the first time that niobium had been part of a fast breeder reactor.^[4] The site investigated fracture mechanics, nuclear reactor physics and hydraulics.

Work on irradiation of metals was also carried out with the School of Materials, University of Manchester and the Department of Materials Science and Metallurgy, University of Cambridge.^[5]

Culcheth is just over one mile north of junction 11 of the M62 motorway on the A574.

It was administered by the Research and Development Branch of the United Kingdom Atomic Energy Authority (UKAEA).

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