TNAG-1497-FCO40-2055-Guangdong-nuclear-power-station-project-at-Daya-Bay-safety-c-1986 — Page 38

4. ON THE QUESTION OF TOPOGRAPHY AND COASTAL EFFECT, IT HAS BEEN POINTED OUT IN REPORT 2 OF THE CURRENT CONSULTANCY (P.11) THAT 'SINCE HONG KONG HAS A COASTAL LOCATION.... STANDARD ATMOSPHERIC

ISPERSION MODELS,....

.....MAY NOT GIVE ADEQUATE RESULTS IN COASTAL AREAS. IT IS VITAL THAT SUCH EFFECTS SE CONSIDERED AND ASSESSED IN PHASE OF THE ACCIDENT ASSESSMENT STUDY.

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5. THE ECONOMIC ASPECT OF THE POSTULATED ACCIDENTS IS ONE OF SEVERAL OF THE CONSEQUENCES OF SUCH ACCIDENTS. HOWEVER, IT IS APPRECIATED THAT THE CONVERSION OF THE ECONOMIC CONSEQUENCES INTO MONETARY VALUES MAY BE DIFFICULT AS THERE IS NO GENERALLY ACCEPTED MODEL AS YET. IT WOULD SUFFICE IF YOU COULD EXPLAIN HOW THIS COULD BE DONE SO THAT WE COULD, IF REQUIRED, PERFORM THE CONVERSION AT A LATER DATE.

6. WITH REGARD TO A SITE SPECIFIC ACCIDENT ASSESSMENT, IT SHOULD DE POINTED OUT THAT IT IS ALSO NOT OUR INTENTION TO REQUEST YOU TO PERFORM A FULL-SCOPE PRA, 1.E. A FULL PELIABILITY ASSESSMENT STARTING FROM PASIC DESIGN. NEVERTHELESS, WE CONS/DEP IT ESSENTIAL THAT THE PROBABILITIES OF THOSE ACCIDENT SEQUENCES COMMONLY DEEMED TO BE RISK DOMINANT' BE STUDIED FOR THE (NEXT WORD UNDERLINED) SPECIFIC DAYA PAY REACTOR. IN PARTICULAR, THE ANALYSIS OF THE PEACTOR CONTAINMENT WITH SPECIAL ATTENTION TO THE EVENTS OF HYDROGEN COMBUSTION SHOULD BE INCLUDED. AS TO ADDITIONAL DESIGN INFORMATION SPECIFIC TO THE DAYA BAY, PLEASE SPECIFY THE REQUIREMENTS FOR THE ENGINEERING DETAILS FOR PHASE 11 OF THE STUDY SO THAT WE COULD LIAISE WITH THE GUANGDONG NUCLEAR POWER JOINT VENTURE COMPANY FOR THE SUPPLY OF THE INFORMATION.

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7. IN THE OTHER STUDIES, THE EAPLY DEATHS VERSUS ACCIDENT PROBABILITY CURVE INEVITABLY APPROACHES A MAXIMUM. THIS IS UNDERSTANDABLE AS THERE IS A LIMIT ON THE TOTAL RADIOACTIVITY IN THE INVENTORY. THE CURVE IN FIGURE 4.1, HOWEVER, DOES NOT SEEM TO HAVE A MAXIMUM AND THE NUMBER OF EARLY DEATH IS OVER 0.5 MILLION FOR A PROBABILITY OF 10-9. SINCE THE NUMBER OF EARLY DEATH IS ONE FOR A PROBABILITY OF 5 X 10-3, YOU MAY WISH TO ELABORATE ON THE CIRCUMSTANTIAL COINCIDENCE WITH A PROBABILITY OF 2 X 10-2 THAT WOULD INCREASE THE EARLY DEATHS FROM 1 TO 0.5 MILLION. CONSIDERING THE NEAREST POPULATION CENTRE HERE IS 30 KM FROM THE PLANT, YOU MAY WISH TO ELABORATE ON HOW A FEW SIEVERTS OF WHOLE BODY DOSE COULD BE IMPARTED TO THESE INDIVIDUALS WITHIN A SHORT PERIOD SO AS TO CAUSE EARLY DEATH.

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