ML14170A720
| ML14170A720 | |
| Person / Time | |
|---|---|
| Issue date: | 06/19/2014 |
| From: | Szabo A NRC/NRR/DPR/PRAB |
| To: | BWR Owners Group, Nuclear Energy Institute |
| Szabo A, DPR/PRAB, 415-1985 | |
| References | |
| EA-13-109 | |
| Download: ML14170A720 (11) | |
Text
d l f Industry Proposal for EA-13-109 Phase 2 Phase 2 NRC Public Meeting June 19 2014 June 19, 2014
Phase 2 Discussion Agenda Phase 2 Discussion Agenda
- NEI 13 02 Rev 0 Guidance
- NEI 13-02 Rev. 0 Guidance
- Rulemaking Insights
- Industry proposal for Phase 2 Option 2 - Key Elements
- Path Forward
- Schedule Schedule 2
Order EA-13-109 Phase 2 Options and Requirements
- B 1 - Design and install a drywell vent that:
B.1 Design and install a drywell vent that:
- Can vent the containment atmosphere and control containment pressure within acceptable limits containment pressure within acceptable limits during severe accident conditions
- Meets the same functional requirements for Meets the same functional requirements for quality and programmatic requirements defined in Section A (wetwell vent) 3
Order EA-13-109 Phase 2 Options and Requirements
- B 2 - Develop and implement a reliable B.2 Develop and implement a reliable containment venting strategy that makes it unlikely that a drywell vent is needed y
y
- Shall be part of an overall accident management plan
- Provide supporting documentation demonstrating pp g
g that containment failure, as a result of overpressure, can be prevented without a drywell vent
- Implement the strategy using procedures, installed or portable equipment and instrumentation 4
NEI 13-02 Guidance k
h d
l k
Links Phase 2 and Rulemaking
- NEI 13-02 Section 2.4.4.2 Phase 2 activities should be informed by
- Phase 2 activities should be informed by analysis/calculations and filtering strategies Rulemaking that show system designs and use of Rulemaking that show system designs and use of operating procedures provide reasonable confidence against drywell head seal gross leakage 6/19/2014 5
Rulemaking Insights Rulemaking Insights
- As industry progresses on technical work related to filt i
t t
i dditi l i i ht i
t filtering strategies, additional insights are coming to light
- Priority should be on Severe Accident Water Addition (SAWA) to accrue the greatest safety benefit (SAWA) to accrue the greatest safety benefit
- The safety benefit of a severe accident vent is significantly enhanced by water addition
- Other strategies have secondary impacts on safety Other strategies have secondary impacts on safety
- Whether a drywell vent is needed depends on water management (accident management)
- Functional requirements also depend on water Functional requirements also depend on water addition/management strategies Design temperature Vent size S
id t
bilit Severe accident capability 6/19/2014 6
EA-13-109 Phase 2 EA 13 109 Phase 2
- Major Elements
- Severe Accident Water Addition (SAWA)
- Controlled water addition may be used to extend use of wetwell vent path wetwell vent path
- Procedures to support addition strategy (EPG/SAGs)
- Part of an overall accident management plan that may be further enhanced by rulemaking
- Severe Accident Water Management (SAWM)
E l
ti t
h th t t
t d l th
- Evaluation to show that water management delays the need for drywell vent (maintains wetwell vent path),
e.g., limiting rate of water addition.
6/19/2014 7
Industry Proposal for Phase 2 - SAWA Industry Proposal for Phase 2 SAWA
- Hardware aspects - severe accident capable Hardware aspects severe accident capable
- Water addition point - RPV/Drywell Water addition pump delivery pressure and flow
- Water addition pump - delivery pressure and flow and timing
- Motive force
- Motive force
- Instrumentation Severe accident considerations
- Severe accident considerations Temperature Radiation Radiation 6/19/2014 8
Path Forward Path Forward
- No anticipated schedule change for EA-13-109 Phase 1 Phase 1
- Achieve NRC/industry alignment on water addition strategy for Phase 2 compliance gy p
- No anticipated schedule change for EA-13-109 Phase 2 ddi i bl i
- Use water addition as an acceptable option to fulfill Phase 2 B.2 requirements
- Agree to proposed Phase 2 guidance schedule for
- Agree to proposed Phase 2 guidance schedule for SAWA
- Develop guidance schedule for SAWM 6/19/2014 9
Estimated Phase 2 Guidance Schedule Date Action Date Action Jun - Jul 2014 NEI working group develop draft 13-02 Phase 2 scope Jul - Sep 2014 NRC/NEI review draft 13-02 Phase 2 scope - public meetings
/
Oct 2014 NEI/BWROG industry comment and feedback Nov 2014 NEI Phase 2 draft revision provided to NRC for reference in ISG Dec 2014 NRC publish draft ISG for public comment Feb 2015 NRC public comment period closed Mar 2015 NRC issues approved ISG Mar 2015 NEI/NRC workshop on Phase 2 Mar 2015 NEI/NRC workshop on Phase 2 Apr - May 2015 NRC/NEI OIP template structure and content without pilots May - Jul 2015 NRC/NEI OIP template pilots
/
d f
d f
f k h Aug 2015 NEI/BWROG draft OIP to industry for comment for workshop Sep 2015 NEI/NRC OIP workshop on pilots and template use Oct 2015 NEI OIP finalized and included in a revision to NEI 13-02 6/19/2014 10 Dec 2015 Station OIPs submitted to NRC
- Questions?
Questions?
6/19/2014 11