Analysis of the proposed GCFR upper and lower plenum flow-through shields has been performed using both discrete ordinate (DOT) and Monte Carlo (MORSE) methods. Several shields having one change of direction in the coolant path (chevron) and two changes of direction (herringbone) were investigated. The shields were modeled as unit cells with periodic boundary conditions. From plenum fluence calculations and design constraints at the reactor vessel liner, it was determined that all the shield configurations analyzed should be adequate for the necessary radiation attenuation.

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Charlotte Nash, left, and Linda Cowan, emergency medical technicians for the Midwest City Ambulance Service, won top awards in a statewide lifesaving competition sponsored recently by AmCare."

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Warren K. "Doc" Jordan"

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.

Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.

Daily newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.

Caption: "Young Marissa Lynch takes a spin in the air at the hands of her aunt, Gina Melton, 16, of Oklahoma City, during a carnival at Little Flower Catholic Church, 1125 S Walker."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Judy Jordan . . . author's wife."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dr. Peters gives his wife, Kay, credit for being the one who "caught the vision, shared the dream and walked each mile of frustration" with him."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dave Proctor of Fort Worth,Texas,glances back as he crosses the finish line during a drag boat race sponsored by the (Southern Drag Bost Association)last weekend at Lake Overholser."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dr. Peters looks over material distributed internationally by his organization."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dr. Peters relaxes at home."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dr. Peters chats with N.B. Hiremath of India and Antoinette Foley of Togo, West Africa who were here recently for the biennial World Neighbors Overseas Conference."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dr. John L. Peters"

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Dr. John L. Peters, founder of World Neighbors, Inc., a United Methodist clergyman and humanitarian, has been nominated for the Nobel Peace Prize."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Southwestern quarterback,Steve Price,draws a crowd as Central State's Karl Scales(55),Mike Ciskowski(42) and Jay Jordan(behind) move in to make the stop."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Central's Steve Tate is off on another long run with Southwestern's David Thompkins closing in."

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Photograph of a historic property in Texas.