Periodic Safety Reviews (PSRs) – Presentation to ENSREG ... - Periodic Safety Reviews... ·...
Transcript of Periodic Safety Reviews (PSRs) – Presentation to ENSREG ... - Periodic Safety Reviews... ·...
Periodic Safety Reviews
(PSRs) – Presentation to
ENSREG Workshop
Dr. Gary Cook – Office for Nuclear
Regulation (UK)
Overview
• General Overview
• Current Arrangements
• Historic PSRs
• New PSR structure going forward
PSR – A Brief History in the UK
• The first round of PSRs (PSR1) took place in the 1990’s/early
2000’s.
• PSRs generally improved the safety cases, brought in a lot of
hazards missed in the original designs and improved consistency
between the newest and older sites
• PSR2 built on the progress made in PSR1 reviewed the hazards
again and the role of PSA for hazards
• PSR3 introduced a different structure (SSG-25), which is allowing
further improvements and learning
• PSR2 also focussed on material condition, ageing and
obsolescence issues, commensurate with the age of the plants
PSR – Overview in the UK
The need to undertake PSRs is stated as part of the site licence
for all licensed sites (and those authorised by DNSR) within the
UK. This is Licence Condition (LC)15:
1. The licensee shall make and implement adequate arrangements for periodic
and systematic review and assessment of safety cases
2. The licensee shall submit to the Executive for approval such part or parts of
the aforesaid arrangement as the Executive may specify
3. The licensee shall ensure that once approved no alteration or amendment
is made to the approved arrangements unless the Executive has approved
such alteration or amendment
4. The licensee shall, if so directed by the Executive, carry out a review and
reassessment of safety and submit a report of such review and
reassessment to the Executive at such intervals, within such a period and
for such matters or operations as may be specified in the direction
PSR – Overview in the UK
• In addition to the Licence Condition 15 ONR has guidance
documentation for both inspection and assessment of PSRs:
http://www.onr.org.uk/operational/tech_insp_guides/ns-insp-gd-015.pdf
http://www.onr.org.uk/operational/tech_asst_guides/ns-tast-gd-050.pdf
• Both documents are aligned with IAEA guidance on Periodic safety
review of nuclear power plants (Specific Safety Guide No. SSG-25)
http://www.iaea.org
• They also take account and make reference to other ONR guidance,
Safety Assessment Principles and wider documentation such as WENRA
guidance
• PSRs play an important role in ONR’s overall through life regulation to
inform such activities as post outage restart consents and annual reviews
of safety
• PSR is undertaken every 10 years, however other durations can be
applied depending on the position of the plant within the lifecycle
(shutdown, defuelling, decommissioning etc.)
Current Arrangements (EDF Energy)
Process-Based Activities
e.g.
Safety System Reviews
Area-Based Walkdowns
Safety Case Health Reviews
CO
MP
LE
TE
NSC Scoping
Paper
X- 4
ONR
Decision
Date
PSR
Submission
X - 1 X X – 4 years X – 1 years (X-Date)
PSR3 Stand
Back Review
X -3.25 years
Evidence Cut-
off Date
X – 2.5 years
Safety Factor
Head
Documents
X – 2.25 years
Summary
Documents
X – 2 years
Processes continue, and resulting work is managed by normal business processes...
Follow up
presentation
to June NSC
Manage PSR
recommendations
…….to agreed programme
Current Arrangements for EDF fleet (ONR)
PSR
Submission
X- 4
ONR
expectation
that all
findings are
closed out
Decision
letter sent to
licensee and
project report
issued on
ONR website
X - 1 X X – 1 years X – Date (X + 2 years)
PSR
Assessments
start
X -0.75 years
Site visits by
ONR
assessment
team
X – 0.5 years
Sharing of
ONR findings
with licensee
X – 0.25 years
Completion of
assessment
documents,
project report
and decision
letter
X – 0.1 years
Regular interactions and resulting work is managed by normal business processes...
Transfer of
documents/data
onto ONR’s
network
Manage PSR
recommendations
…….to agreed programme
Historic PSRs
Station First PSR Decision
Date
Second PSR Decision
Date
Hinkley Point B
Hunterston B
1997 2007
Dungeness B 1998 2008
Heysham 1
Hartlepool
1999 2009
Heysham 2
Torness
2000 2010
Sizewell B 2005 2015
Historic PSRs – 2nd Round of PSRs
2005-2015
0
100
200
300
400
500
600
EDF Energy Findings
ONR Findings
Transition of PSR structure (NPPs only)
• Initially the PSR structure took on the form of “Main
Reviews” supported by “Discipline Reviews”
• The reviews sat in Chapters of the PSR; chapter 1 always
being the headline safety justification
• The process has matured and become more efficient for
both Licensee and ONR as the second round of PSRs
took place across the plants
• IAEA guidance (SSG-25) published in 2013 will form
the basis of the PSR3 work
PSR3 Structure
NSC
Paper
Dynamic
ALARP
PSR3
Stand
Back
Review
Summary
Document
on Plant
Design
Summary
Document
on Safety
Analysis
Summary
Document
on Safety
Performance
Safety
Factor 1
Plant
Design
Safety
Factor 2
Actual
Condition of
Safety
Related
Plant
Safety
Factor 3
Equipment
Qualification
Safety
Factor 4
Ageing and
Lifetime
Management
Safety
Factor 5
Deterministic
Safety
Analysis
Safety
Factor 6
Probabilistic
Safety
Analysis
Safety
Factor 7
Hazard
Analysis
Safety
Factor 8
Safety
Performance
Safety
Factor 9
Experience
from other
Plants &
Research
Safety
Factor 10
Organisation,
Management
Systems and
Safety Culture
Safety
Factor 11
Procedures
Safety
Factor 12
Human
Factors
Safety
Factor 13
Emergency
Planning
Safety
Factor 14
Radiological
Impact on
the
Environment
Safety
Factor 15
Radiological
Protection
Safety
Factor 16
Decommissioning
Additional Safety Factor report
following advice from NSC to cover
decommissioning phase
EDF documents that align with the
IAEA Safety Factors documents and
focus on the company process
management information supporting
the review area.
Upcoming PSR3s
Station PSR3 Submission Date ONR Decision Date
Hinkley Point B
Hunterston B
January 2016 January 2017
Dungeness B January 2017 January 2018
Heysham 1
Hartlepool
January 2018 January 2019
Heysham 2
Torness
January 2019 January 2020
Sizewell B January 2024 January 2025
Wylfa
• Wylfa is the last remaining Magnox reactor
and is due to cease operation by
December 2015
• Wylfa completed the most recent PSR in
September 2014 (decision date)
• Next PSR due 2023/4
• ONR considered the stage Wylfa was
at in the lifecycle, future submissions
that would cover defuelling,
decommissioning
Conclusions
• The UK regulator and licensees has a
mature process for undertaking PSRs
• The process has evolved over the past 20
years and the UK NPP fleet is currently
about to undertake the third round of PSRs
• Learning from recent PSRs will continue
to be applied to the AGRs as they
commence the third round of PSRs