核电.pdf

REGULATORY GUIDE Fuel Heat Generati... Page 1 of 24 /RG/03/03- 11/24/99 Revision 1 January 1999 REGULATORY GUIDE Spent Fuel Heat Generation in an Independent Spent Fuel Storage Installation (Draft was issued as DG-3010) [ Division Index | Regulatory Guide Index | NRC Home Page ] Publication Information A. Introduction In 10 CFR Part 72, "Licensing Requirements for the Independent Storage of Spent Nuclear Fuel and High-Level Radioactive Waste," paragraph (h)(1) of Section , "Overall Requirements," requires that spent fuel cladding be protected during storage against degradation that leads to gross ruptures or the fuel must be otherwise confined such that degradation of the fuel during storage will not pose operational safety problems with respect to its removal from storage. It has been shown that, under certain environmental conditions, high storage temperatures can cause degradation and gross rupture of the fuel rods to occur very rapidly. It is necessary to know what storage temperatures are anticipated during the life of the storage installation and that these temperatures will not significantly degrade the cladding to a point that causes gross ruptures. The temperature in an independent spent fuel storage installation is a function of the heat generated by the stored fuel assemblies. The spent fuel storage system is required by 10 CFR (a)(4) to be designed with a heat REGULATORY GUIDE Fuel Heat Generati... Page 2 of 24 /RG/03/03- 11/24/99 removal capability consistent with its importance to safety. This regulatory guide presents a method acceptable to the Nuclear mission (NRC) staff for calculating heat generation rates for use as design input for an independent spent fuel storage installation. The original guide, issued in September 1984, was based on validated analyses performed for pressurized-water reactors (PWRs), and boiling-water reactors (BWRs) were considered only as a simple conservat