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Nuclear News
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Introduction
The requirement to conduct a reactor pressure vessel (RPV) surveillance
program is given in 10 CFR 50 Appendix H, and the detailed implementation is
described in American Society for Testing and Materials (ASTM) standard E 185.
For most nuclear plants throughout the world, between 3 and 5 surveillance
capsules (typically 3 for boiling water reactor (BWR) plants and 5 for
pressurized water reactor (PWR) plants) were placed in the downcomer near the
vessel inner diameter surface prior to initial startup. These
capsules usually contain neutron dosimeters, tensile specimens, Charpy
specimens, and sometimes fracture toughness specimens. These capsules are
pulled and analyzed periodically throughout the plant life to monitor the
neutron damage to the RPV.
Surveillance Testing Program
MPM maintains a Nuclear Regulatory Commission (NRC) license to receive and
test radioactive surveillance capsules. This work is performed under
the MPM Nuclear Quality Assurance Program. The services provided under the
MPM testing program are summarized below:
- MPM provides the shipping container and the transportation from the
plant site to MPM's laboratories
- MPM provides the information needed for preparing the shipping papers
- Capsule opening, inventory, and specimen cleaning
- Dosimetry analysis to determine specific activities
- Neutron transport analysis in accordance with Regulatory Guide 1.190
- Mechanical property measurements for Charpy, tensile, and fracture
toughness specimens
- Waste disposal
- Optional specimen storage
- P-T curve calculation
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