Method and apparatus for a jet pump slip joint internal seal

A jet pump slip joint internal seal installed in a Boiling Water Reactor (BWR) jet pump assembly, comprising:

• a diffuser of the jet pump assembly of the BWR, the diffuser having an upper crown with an internal step,
• an inlet mixer with a lowest distal end, the lowest distal end being located inside the upper crown of the diffuser and above the internal step, and
• the jet pump slip joint internal seal being located between the internal step and the lowest distal end of the inlet mixer, the jet pump slip joint internal seal including,
• a substantially circular seal mounting ring with a cross-section including an upper portion projecting horizontally toward an epicenter of the seal mounting ring and a lower portion projecting vertical downward, a lower surface of the upper portion being about perpendicular to an inner surface of the lower portion, and
• a flexible metallic seal inside the seal mounting ring, the lower surface of the upper portion and the inner surface of the lower portion of the seal mounting ring contacting the flexible metallic seal to retain the flexible metallic seal within the seal mounting ring.

A method of installing a jet pump slip joint internal seal in a Boiling Water Reactor (BWR) jet pump assembly, comprising:

• forming the internal seal by the following steps,
• forming a substantially circular seal mounting ring with a cross-section including an upper portion projecting horizontally toward an epicenter of the seal mounting ring and a lower portion projecting vertically downward, a lower surface of the upper portion being about perpendicular to an inner surface of the lower portion,
• forming a substantially circular flexible metallic seal and placing the flexible metallic seal in the seal mounting ring,
• retaining the flexible metallic seal within the seal mounting ring by contacting the flexible metallic seal against the lower surface of the upper portion and the inner surface of the lower portion of the seal mounting ring, and
• placing the internal seal on an internal step inside an upper crown of a diffuser of the jet pump assembly, an upper surface of the upper portion of the seal mounting ring contacting a lowest distal end of an inlet mixer of the jet pump assembly.