SM-1 REACTOR VESSEL COVER AND FLANGE STRESS ANALYSIS

Technical Report · Mon Feb 19 00:00:00 EST 1962

DOI:https://doi.org/10.2172/4808024· OSTI ID:4808024

Sayre, M F

The maximum stress calculated for the SMl-1 reactor vessel closure studs occurs during operation at full power. This value is 27,180 psi of which 19,800 psi is tension and 7380 psi bending. This stress does not include a stress concentration factor for effect of threads. It was eonservatively assumed the studs were initially tightened to a code allowable stress of 20,000 psi as specified in the ASME Code rather than the lesser stress obtained by the normal operating procedure. The maximum calculated stress occurs at the outside surface of the cover where the stress ranges from 318 psi in tension to 90,660 psi in compression. The alternating stress is 50,000 psi. According to the Navy Code for a stress range of 50,000 psi, the eover material ean safely undergo a maximum of 1600 cycles. It was estimated that the SM-1 will go through approximately 000 startup and shutdown cycles during a 20-yr life period, so the calculated stress is regarded as safe. For a transient eondition of 30 deg F/hr during heat-up, approximate temperature differences between the inside and outside surfaces of the cover were obtained. Temperature differentials between the inside and outside surfaces of the cover are increased by roughly 10%; above the steady state condition. More exact calculations of the transient stresses did not appear necessary siuce they would be not more than 10% greater than the steady state thermal stress. (auth)

• Research Organization: Alco Products, Inc., Schenectady, NY (United States)
• DOE Contract Number: AT(30-1)-2639
• NSA Number: NSA-16-011188
• OSTI ID: 4808024
• Report Number(s): APAE-Memo-302
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-62
• Country of Publication: United States
• Language: English

Related Subjects

REACTOR TECHNOLOGY
CLOSURES
EQUATIONS
ERRORS
FAILURES
FATIGUE
HEATING
HIGH TEMPERATURE
JOINTS
MECHANICAL PROPERTIES
MECHANICAL STRUCTURES
NUMERICALS
OPERATION
PLANNING
POWER PLANTS
PRESSURE
PRESSURE VESSELS
REACTOR SAFETY
SHUTDOWN
SM-1
STABILITY
STANDARDS
STARTUP
STRESSES
SURFACES
TEMPERATURE
TENSILE PROPERTIES
THERMAL CONDUCTIVITY
THERMAL STRESSES
THICKNESS
TRANSIENTS
VARIATIONS