Nuclear standards: Nuclear pedigree.

Our Quality system accreditations and extensive Customer references demonstrate our proven capabilities across the global Nuclear industry. 

From the control of our raw materials to final inspection, certification and shipment we apply the highest standards of product integrity, process control combined with the Mannesmann reassurance of product originality.  

From our historical development of PWR power generation for the French (RCC-M) and US (ASME III) programs our knowledge and skills have developed across the global technologies : CANDU, VVER Rosatom, China CPR’s and India PHWR’s. 

Applying our skills to the latest generation of EPR power plants whilst partnering with developing technologies and sciences such as CERN, ITER, Small modular reactors, and marine vessels. 

For over 50 years we have partnered with our global Customers supplying stainless steel and Nickel alloys tubes to the most exacting specification requirements.

Project Management:   

Our Nuclear experience reflects not only the exacting product requirements but also that of managing Nuclear projects and providing all of the associated documentation requirements.  

ASME Quality System Certificates

Our Nuclear quality system approvals reflect our experience and commitment to global Nuclear technologies.

✔️ ASME III certified
✔️ HAF 604- NNSA certified
✔️ RCC-M compliant
✔️ extensive Customer and design code accreditations.

Grades

MST designationNearest equivalent standardTypical chemical composition 1)DensityMin. mechanical prop. at RT
UNSENCmaxCrNiMoCuothers  Rp 0.2 Yield StrengthRm Tensile Strength 
         g/cm3lb/in3MPaksiMPaksi
DMV 304LS304031.43060.0319.011.0   7.90.291702548570
DMV 4335               
DMV 321S321001.45410.0818.510.5  Ti > 5 x C < 0.6%7.90.291702548570
DMV 316LS316031.4404 0.0317.012.02.25 8.00.291702548570
DMV 316 LNS316531.4429 0.0317.012.52.75N > 0.06 < 0.088.00.292053051575
DMV 800N088001.48760.0821.032.0  Ti < 0.4080.292103150073
DMV 600 LN066002.48170.02516.076.0  Fe 88.40.301802655080
DMV 690N066902.46420.0229.060.0  Fe 98.20.292053058585
DMV 400N044002.43600.15 65.0 30.0Fe 2; Mn 1.58.80.321802645065

Class 1 Instrumentation Tubes

Class 1, 2 & 3 Instrumentation tubes according to RCC-M, ASME III, CSA N285 and HAF 604 standards.

PRODUCT: TUBES

OD rangeInchmm
min0.2366.0
max0.98425.0
WT rangeInchmm
min0.020.5
max0.0982.5

In-core measurement and control

For in-core neutron flux distribution & temperature monitoring and as Guide Thimble Tubes within Rod Cluster Control Assemblies. With tube diameters from 1.6mm diameter in straight or coils forms with stainless and Nickel alloys melted and refined to Nuclear requirements.

PRODUCT: TUBES

OD rangeInchmm
min0.0631.6
max3.588.9
WT rangeInchmm
min0.020.5
max0.98425.0

Heat Exchanger

Our Heat Exchanger tubes are used for critical components within the Nuclear Island, typically in the secondary circuit (class 2). We supply in straight lengths of U tube form.  We work in close partnership with fabricators and designers.

PRODUCT: U-BENT TUBES (up to 43 meters/141ft long)

OD rangeInchmm
min0.512.7
max1.538.1
WT rangeInchmm
min0.0350.89
max0.1774.5

 

PRODUCT: STRAIGHT TUBES

OD rangeInchmm
min0.3749.5
max2.050.8
WT rangeInchmm
min0.0350.89
max0.1774.5

Piping

Our Nuclear pipes are manufactured for Class 1,2 & 3 Piping for Nuclear steam supply systems and non-nuclear island applications such as Nuclear fuel reprocessing.  We manufacture pipes with close dimensional tolerances, tight UT control, controlled surface finishes and a high degree of cleanliness.  

We work in close partnership with fabricators and designers. 

We collaborate closely with fittings manufacturers to supply them with raw material for their fittings manufacture.

PRODUCT: PIPING 

OD rangeInchmm
min0.2366.0
max11.02280.0
WT rangeInchmm
min0.020.5
max1.96950.0

Feeder pipes and Liner tubes

Adding value by providing finished machined reactor core liner components in ferritic stainless combined with Ni alloy 690.

REACTOR LINER COMPONENTS

OD rangeInchmm
min0.0631.60
max9.63244.5