ML082050386

April 2008 Observation Visit - Oconee/Shearon Harris - Pilot Plant Transition to NFPA 805 - F and O Resolution/Peer Review

ML082050386
Person / Time
Site:	Oconee, Harris
Issue date:	04/14/2008
From:	Duke Energy Carolinas, Duke Energy Corp
To:	NRC/NRR/ADRA/DRA/AFPB
Oudinot D, NRR/DRA, 415-4064
Shared Package
ML082050482	List: ML082050386 ML082050390 ML082050402 ML082050407
References
Download: ML082050386 (9)

Text

Oconee / Harris NFPA 805 Pilot Observation Meeting Charlotte, NC April 14 - 16, 2008 1

Statistics - NRC Peer Review Element Not Met Met I I/II II II/III III Not Rev NA TOTAL PP 3 6 1 1 1 12 ES 8 1 2 4 15 CS 2 13 1 16 QLS 1 6 7 PRM 2 18 2 22 FSS 10 20 6 5 4 1 1 3 50 IGN 10 3 2 15 QNS 5 1 6 CF 2 1 3 HRA 3 3 2 8 SF 3 3 6 FQ 5 4 1 10 UNC 2 1 3 MU 4 9 1 14 TOTAL 33 107 10 5 6 3 8 2 13 187 2

Key Findings Q Labeled conservative 3/4 Remedy requires departure from 6850 (draft FAQs generated in parallel) 3/4 Credit of modifications not yet installed may also be required to reduce total CDF/LERF Q Peer Review 3/4 Need for limited/focused assessment?

O Elements Not Reviewed O Substantial changes 3/4 Not planned for Oconee FPRA O Uncertainty assessment appropriate for application will accompany LAR submittal O F&O resolution process expected to address remaining elements 3

Preliminary Results from draft report Q NRC draft report (recd 4/10/08) identified areas requiring the most additional work to be:

3/4 Resolution of internal events PRA peer review comments 3/4 Fire modeling (especially multi-compartment analysis) 3/4 Identification and refinement of higher risk scenarios 3/4 Completion of an uncertainty analysis 4

Status of FPIE Peer Review Comments Q Resolution documentation not available during NRC Peer Review of FPRA Q Most items have been addressed Q Most of the remaining items are in the documentation arena Q Responses to NRC findings during review of FPRA to be generated Q Small population of FPIE open items may have to be addressed for each application 5

Status of Remaining Key Areas Q MCA Screening Analysis completed and attached to Scenario Report Q Identification and refinement of higher risk scenarios 3/4 Attachment providing summary of CDF results modified to include initiator 3/4 Significant contributors (high FV basic events) identified from draft integrated model (XINITS) 3/4 LERF documentation improved (includes identification of containment bypass scenarios) 3/4 Inconsistencies between CDF and expected LERF results resolved Q Uncertainty & Sensitivity Matrix completed and appended to Summary Report 6

Technical Issue Summary SR Topic Status Breaker coordination issue (self identified open CS-B1 Post-LAR; safety-related loads coordinated item)

Horizontal propagation for cables with PVC jackets On-going; supporting basis for current FSS-A5 (self identified open item) treatment in development; to be resolved prior to LAR Pooling of PVC; may impact damage threshold (self On-going; to be resolved prior to LAR FSS-C5 identified open item)

Fire brigade response time with respect to On-going; to be resolved prior to LAR FSS-D6 formation of HGL Complete - MCA screening analysis identified FSS-G1 Multi-compartment analysis did not address failure no new scenarios for quantification thru G6 of rated barriers Relative timing of HFE in fire scenario; time from HRA-C1 Complete - Important actions revisited cue versus time from fire Demonstration of convergence for selected FQ-B1 Post-LAR; primarily an IE issue (F&O QU-8) truncation limit Use of nominal HEP values may result in loss of Complete - HEP values set to 0.1 during initial FQ-C1 cutsets before application of solve before recovery recoveries/multipliers Identification of significant contributors; Complete - inconsistencies between LERF and FQ-E1 inconsistencies between LERF and CDF cutsets CDF cutsets resolved 7

Documentation Related SR Topic Status PP-B2 & B3 Partitioning Post-LAR - explain role of partitions related to containing damaging effects of a fire PP-C3 Improve general description and Post-LAR - enhancements to be provided identification of unique features in planned revision CS-C4 Breaker coordination Post-LAR - breaker coordination documentation expected to remain open QLS-A3 Qualitative screening Post-LAR - calc revision planned to clarify elimination of structures from global analysis boundary PRM-D1 Changes made to FPIE model to support On-going - eliminate reliance on special 2005 FPRA not documented initiators FSS-G2 Define screening criteria for multi- Complete - added to Scenario Report compartment analysis FSS-H2 Document resolution of PVC pooling On-going; to be resolved prior to LAR issue FSS-H8 Multi-compartment analysis Complete - MCA provided as Attachment documentation D to Scenario Report 8

Documentation Related SR Topic Status HRA-E1 Address how Alarm Response and Complete - added discussion to FPRA Emergency & Abnormal Operating Model Development Report Procedures are followed given a fire SF-A2 Evaluate suppression diversion No impact on FPRA quantification SF-A4 Seismic response procedure does not No impact on FPRA quantification cover fire SF-A5 Fire preplan does not cover seismic No impact on FPRA quantification FQ-A2 Initiating events not defined for all fire Complete - initiating event added to scenarios results summary info provided in Attachment A of Summary Report FQ-F1 Improve LERF documentation Complete - added LERF discussion to Summary Report MU-B4, B5, B6 PRA configuration control Action to be completed before LAR submittal MU-E1 Perform QA acceptance for FRANC Action to be completed before LAR submittal 9