NS Savannah Nuclear Merchant Ship Design Review. Summary Report Page: 25 of 42
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Task No. 17 - Primary System Equipment Quality Control
The purpose of this task was as follows:
(a) Review estimated corrosion rates and maximum corrosion
for reactor and primary system including the effect of
nitrogen fixation.
(b) Review radiation effects on core materials, reactor vessel
and primary system.
(c) Review of thermal insulation in contact with stainless steel
piping and equipment for possible metal chloride contamination,
stress corrosion cracking in primary system.
(d) Review welding procedures and stainless steel cladding procedures
to insure against carbon migration and micro fissures in weld
heat-affected zones for reactor vessel and primary loop.
(e) Review B&W activation calculations of primary coolant.
(f) Review B&W stress analysis of boiler and pressurizer for
purpose of upgrading.
(g) Review B&W calculations to determine the temperature limitations
of primary system materials and components and possible modes of
malfunction that could endanger these limits.
For part (a), corrosion calculations as prepared by Babcock & Wilcox were
reviewed to verify their validity. The corrosion rate used by B&W as a basis
for calculation; 10 mg/dm2 per month, was verified. This is the accepted
rate for the 300 series stainless steel and it is not expected that corrosion
during service will exceed it.
For part (b), radiation effects on core materials, reactor vessel and
the primary system were reviewed.
With our present knowledge of the hardening effects of high intensity
radiation on the stainless steel core materials, such effects should be
minor so that no failure should result therefrom. Similarly the reactor
vessel should not be affected. Since there should be no fast neutrons
in the primary system, the piping should not be affected by radiation. There
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NS Savannah Nuclear Merchant Ship Design Review. Summary Report, report, June 30, 1960; United States. (https://digital.library.unt.edu/ark:/67531/metadc863057/m1/25/: accessed August 15, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.