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
Industry d Proposall ffor EA-13-109 Phase 2 NRC Public Meeting June 19 19, 2014
Phase 2 Discussion Agenda
- NEI 13-02 13 02 Rev.
Rev 0 Guidance
- Rulemaking Insights
- Industry proposal for Phase 2 Option 2 - Key Elements
- Path Forward
- Schedule 2
Order EA-13-109 Phase 2 Options and Requirements
- B.1 B 1 - Design and install a drywell vent that:
- Can vent the containment atmosphere and control containment pressure within acceptable limits during severe accident conditions
- 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 B.2 2 - Develop and implement a reliable containment venting strategy that makes it unlikelyy that a drywell y vent is needed
- Shall be part of an overall accident management plan
- Provide supporting pp g documentation demonstratingg 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 Links k Phase h 2 and d Rulemaking l k
- NEI 13-02 Section 2.4.4.2
- Phase 2 activities should be informed by analysis/calculations and filtering strategies 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
- As industry progresses on technical work related to filt i strategies, filtering t t i additional dditi l iinsights i ht are coming i tto light
- Priority should be on Severe Accident Water Addition (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
- Whether a drywell vent is needed depends on water management (accident management)
- Functional requirements also depend on water addition/management strategies Design temperature Vent size Severe S accident id t capability bilit 6/19/2014 6
- Major Elements
- Severe Accident Water Addition (SAWA)
- Controlled water addition may be used to extend use of 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)
- EEvaluation l ti tto showh th thatt water t managementt d delays l th 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
- Hardware aspects - severe accident capable
- Water addition point - RPV/Drywell
- Water addition pump - delivery pressure and flow and timing
- Motive force
- Instrumentation
- Severe accident considerations Temperature Radiation 6/19/2014 8
Path Forward
- No anticipated schedule change for EA-13-109 Phase 1
- Achieve NRC/industry alignment on water addition strategygy for Phase 2 compliance p
- No anticipated schedule change for EA-13-109 Phase 2
- Use water addition ddi i as an acceptable bl option i to fulfill Phase 2 B.2 requirements
- 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 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 Apr - May 2015 NRC/NEI OIP template structure and content without pilots May - Jul 2015 NRC/NEI OIP template pilots Aug 2015 NEI/BWROG
/ d draft f OIP to industry d ffor comment ffor workshop kh 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 Dec 2015 Station OIPs submitted to NRC 6/19/2014 10
- Questions?
6/19/2014 11