TNAG-1497-FCO40-2055-Guangdong-nuclear-power-station-project-at-Daya-Bay-safety-c-1986 — Page 36

ZC

ALNAN 7245

CONFIDENTIAL

MODSH

FM HOKON TO MODSH

0907512 JUN

GRS 300

HICK

RECEIVED IN

INDEX

160/1

18 JUN 1986

idi

NED

NO DISTRIBUTION

THIS TELEGRAM

WAS NOT ADVANCED

[WH428]

CONFIDENTIAL

FM HONG KONG

TO IMMEDIATE AERE HARWELL

TELNO 0907512

OF 090751Z JUNE 96

FOR DP. 9. MADE

FROM YRS. E NOK, ECONOMIC SERVICE DRANCH.

AS FORESHADOWED IN PY IMMEDIATELY PRECEDING TELGRAM, THE

FOLLOWING ARE THE POINTS CONNECTED WITH REPORT NO. 4 (ACCIDENT

ASSESSMENT PHASE 1) ON WHICH FURTHER CLARIFICATION FROM YOU IS

SOUGHT:

1. PLEASE PROVIDE FURTHER EXPLANATION ON THE SOURCE TERMS, AND EXPLAIN THE DESIGN RISK REDUCTION FEATURES SPECIFIC TO SIZEWELL-D

AS COMPARED TO 'TYPICAL EXISTING WESTERN EUROPEAN PLANTS'.

PLEASE ALSO INDICATE THE QUANTITATIVE SAFETY GOAL OF SIZEWELL-}}

COMPARE IT WITH THE FRENCH GOAL OF 10-6 PER REACTOR YEAR, AND COMMENT ON WHETHER THE ACCIDENT FREQUENCIES ASSIGNED IN THE

PHASE 1 STUDY MEET THE FRENCH SAFETY GOAL.

2. ON THE ACCIDENT CATEGORIES, PLEASE PROVIDE A DETAILED DESCRIPTION OF THE EVENTS AND EXPLAIN THE RISK SIGNIFICANCE OF THESE SEQUENCES. IF THESE SEQUENCES ARE ALREADY DESCRIBED IN DETAIL IN THE REF. (3) QUOTED, GRATEFUL IF YOU WOULD SUPPLY A COPY OF THE REFERENCE AND INDICATE WHAT AMENDMENTS WERE MADE TO TAKE ACCOUNT OF FACTORS SPECIFIC TO THE SIZEWELL DESIGN. IN YOUR COMMENTS, PLEASE ELABORATE WHICH OF THE CATEGORIES DC 1-DC 10

INCLUDE THE FOLLOWING SEQUENCES (USING RSS NOMENCLATURE):

THILB'-GAMMA, TMLB'-DELTA, THL-EPSILON, S2C-DELTA, SID-EPSILON,

AD-APHA, AD-EPSILON AND PC-GAMMA.