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DS397 Saf Use Mod RRs with NUSSC comments 18-06-2010

DS397 Saf Use Mod RRs with NUSSC comments 18-06-2010

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5.4. Thermal characteristics• Calculation of specific heating rates (due to nuclear fission and nuclear heating) of all incorematerials.• Calculation of:a. radial and axial heat flux density and temperature distribution;b. coolant temperature increase.• Calculation of temperature control margin which can be achieved by the available controlsystems (heaters, mixed gas systems).• Calculation of the margin against film boiling (burn-out), under the worst possibleoperating conditions (max. power, minimum cooling), applying all relevant uncertainty(hot spot) factors. A justification of the correlation(s) used must be given.Remark:All calculations are to be made for nominal reactor power, and cooling conditions as well asduring accident and reactor shutdown power.5.5. Mechanical and thermal stress characteristicsThe calculation methods and the applied criteria should be described for all safety relatedmechanical components. The tensile, thermal and admissible stresses should be presented andspecial attention should be addressed to:• transient behaviour;• containment lids;• cryogenic material behaviour;• standard gas supply pressures.6. FABRICATION, ASSEMBLY AND COMMISSIONING6.1. Fabrication6.2. Assembly6.3. CommissioningSummarized description of the quality programme, <strong>with</strong> amongst others incoming goodsinspection, inspection and testing during assembling and final inspection and testing, to whichthe irradiation facility will be subjected prior to operation. The detailed management systemprogramme must separately be documented, i.e. in a quality assurance/quality control reportand a commissioning report.7. OPERATION AND PERIODICAL TESTING7.1. GeneralOutline of check-out, startup, operation, special measurements and emergency procedures.The detailed operation and handling must be specified in a separate "Operation and HandlingManual".In this section, special periodic testing requirements and dedicated check-out procedures, tobe performed by the project engineer, should be described. In case of extended programmes,reference could be made to a special document.51

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