ML010590147
| ML010590147 | |
| Person / Time | |
|---|---|
| Issue date: | 01/10/2001 |
| From: | Joseph Colaccino NRC/NRR/DE/EMEB |
| To: | |
| Colaccino J, NRC/NRR/DE/EMEB, 415-2753 | |
| References | |
| Download: ML010590147 (2) | |
Text
Current Regulatory Activities Related to Air-Operated Valves g
Joseph Colaccino US Nuclear Regulatory Commission Office of Nuclear Reactor Regulation January 10, 2001 AOV Program Submittals B&WOG Topical Report BAW-2359 dated July 2000 Transmitted to NRC in letter dated July 14, 2000
- Supports a Parallel Effort by Davis-Besse
- Design verification
- Response time testing
- Diagnostic testing
- Setpoint control
- Periodic exercising
- Preventitive maintenance AOV Program Submittals Public Meeting at NRC Headquaters on January 25, 2001 (see NRC WEB Page for Notice and Agenda)
- Meeting with B&WOG and Davis-Besse
- Clarification of Submittals to Minimize RAIs
- Meeting Topics:
Consideration of NRC concerns
- Risk-Informed approach Design Basis Capability and Periodic Verification
- Actuator Capability
- Setpoint Control
- Test strategies for long term periodic verification Presentation Topics uAOV Program Submittals B&WOG Topical Report
- Davis Besse Licensing Action Public Meeting mASME Risk-Informed AOV Code Case m NRC POV Inspection Procedure AOV Program Submittals Davis Besse Licensing Action dated September 11, 2000
- Risk-Informed Process to Determine Test Strategies for IST of Pumps and Valves
- AOVs First of 4 Groups of Components
"* Proposed Alternative to 10 CFR 50.55a(f)
- Replace stroke-time testing required by Code
" Utilizes Code Case OMN-3 and NRC RG 1.175
"* More Comprehensive Program than JOG AOV
"* Part of B&WOG Effort to Apply RI-IST to AOVs
"* Some NRC Concerns not Addressed ASME Risk-Informed AOV Code Case "Code Case Balloted at ASME BNCS 6 negatives due to insufficient response to NRC technical comments comments revised; neg. expected to be withdrawn
" NRC Withdrawl Included Potential Modifications to Code Case that May be Incorporated into Final Rule SMix of static and dynamic testing Degredation rate and available margin for HSSCs Address perception of "run-to-failure" for LSSCs LSSC setpoints based on test information Periodic testing for LSSCs
NRC POV Inspection Procedure
"* Includes all Power-Actuated Valves Except for MOVs
"* Not Part of New Core Inspection Procedures
- Similar to New MOV Inspection Procedure
- Inspection Procedure Draft Not Completed
- May Include General Diagnostic Trace(s)
(see following slide)
General Air-Operated Valve Mechanical Properties Graph Air-to-Open Valve Tested at Static Conditions S/
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