Nuclear Safety Standards Committee

41st Meeting, 21 – 23 June, 2016

Agenda item

Title

Name, Section - Division

NPP Operational Safety Standards

TM on Novel Designs and Safety Principles for NPPs

3-6 October 2016

Vesselina RanguelovaOSSNSNI

10/4/2016 2

Content

- IAEA Safety Standards background

- Revision Process for IAEA Safety Standards

- Need for revision of the IAEA Safety Standards in NPP Operational Safety Domain

- Challenges in NPP Operational Safety Guides revision process

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Safety Standards Series

Hierarchy

Guides

Requirements

Fundamentals

Recommendations

(“should”)

Requirements that

must be met (“shall”)

Objectives, concepts,

principles

4

IAEA Safety Standards :

Operational Safety

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NPP Operational Safety:

Need for Review of IAEA SS on NPP

Operational Safety

- Under the IAEA SS programme review is requested

every 10 years; Most of the IAEA Safety Guides on NPP Operational Safety was published between 2000 and 2002

- IAEA Safety Requirements SSR-2/2 were revised in 2015/2016

- Lots of experience was collected with operational safety improvements in IAEA MSs, including via OSART missions

- OSART Guidelines were revised in 2016

- To consider lessens learned form Fukushima; Fukushima Report and Vienna Safety Declaration

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Guides to be reviewed

2.1( Fire safety); 2.2 (LCO); 2.3 ( Modifications);

2.4 (Organization); 2.5 (Core&Fuel); 2.6

(Maintenance Surveillance and ISI);

2.7 (RP and WM); 2.8 (Staff); 2.14 ( Conduct of

Operations);

GS-G-3.1

GS-G-3.5

NS-G-2.4

NS-G-2.8

NS-G-2.14

NS-G-2.3

SSG-25, NS-G-

2.13 SSG-30

NS-G-2.12

GS-G-2.1

NS-G-2.15

NS-G-2.7

RS-G-1.1

NS-G-2.7, GSG-1

WS-G-2.5, WS-G-2.6

S-G-6.1, SSG-15

NS-G-2.1

NS-G-2.11

SSG-28

SSG-13

NS-G-2.5

NS-G-2.6

WS-G-2.1

NS-G-2.2

Revision of eight closely interrelated Safety

Guides: NS-G-2.2 to 2.8 and NS-G-2.14

8

2015 TM on Revision of IAEA Safety Guides on NPP operation Safety

proposed to prepare revision in two steps:

Step A:

a) Revise all guides by amendment ( DPP 497)

b) Develop a new Guide 2.1 to cover all external and internal

hazards

c) Develop a new Guide on Monitoring and Review of Safety

Performance in NPP Operation

Revision of eight closely interrelated Safety

Guides: NS-G-2.2 to 2.8 and NS-G-2.14

9

Step B

a) Revise all NPP Operational Safety Guides and consider

possibility to issue one guide on NPP Operational safety with

different Volumes to keep the set of SS on Operational Safety in a

logical and intact order, to reduce their number and follow the

organization of the SSR-2/2 Rev.1 ( In line with IAEA Long term

structure for Standards)

b) Consider link with GSR part 2 and its safety guides

c) Rearrange some of the standards content to better fit typical

NPP organizational structure

Challenges in the revision process

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• Ensuring consistency amongst all IAEA Safety Standards

• How to address increased requirements for design safety at

operational level

• Strengthening Defence in Depth is recognized as major

challenge after Fukushima – what does DiD principle mean in

NPP operations?? Do we need additional interpretations?

Do we need to address DiD explicitly in the NPP Operational

Standards?

Thank you!