NMSR FISSION PRODUCT AND NEUTRON ACTIVATION DOSE RATES

The primary purpose of this report is to provide basic data for personnel protection from fission product and activated material radiations both during and after shutdown NMSR for refueling, maintenance and waste disposal operations. It also provides data useful in estimating activity levels in the coolant loop and the off-gas operation. Previous work by Perkins and others is updated for use at a power level of 69 MW. Calculation techniques and results are described for fission product volumetric source strengths in the core and resulting radiation levels outside the primary shield tank, at the top of the open water-filled pressure vessel and external to shield fuel elements removed from the core. A similar analysis is included for neutron activation of reactor internals, pressure vessel and primary shield tank steel. A Co59 concentration of 0.585 Wt. percent has been used for this report to obtain maximum levels. The NSMR contract specifies the radiation level external to the primary shield should not exceed 200 mr/hr at one-half hour after shutdown. The calculated results show the primary shield design meets this requirement.

• Supplemental Notes:
  • This document is available for review at the Department of Commerce Library, Main Commerce Building, Washington, D.C., under reference number BAW-1114.
• Corporate Authors:

  Babcock and Wilcox Company

  Atomic Energy Division
  Lynchburg, VA  United States  24504
• Authors:
  • Turner, M A
• Publication Date: 1958-7

Media Info

• Features: References;
• Pagination: 33 p.

Subject/Index Terms

• TRT Terms: Design; Nuclear power plants; Nuclear powered ships; Nuclear reactors; Refueling; Safety
• Old TRIS Terms: Nuclear reactor design; Nuclear reactor safety
• Subject Areas: Design; Marine Transportation; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00026061
• Record Type: Publication
• Source Agency: Maritime Administration
• Contract Numbers: AT(30-3)-274
• Files: TRIS, USDOT
• Created Date: Mar 2 1973 12:00AM