RIS 2002-14, Proposed Changes to the Safety System Unavailability Performance Indicators
| ML022740012 | |
| Person / Time | |
|---|---|
| Issue date: | 09/30/2002 |
| From: | Beckner W NRC/NRR/DRIP/RORP |
| To: | |
| Sanders S, NRR/DIPM, 415-2956 | |
| Shared Package | |
| ML022740008 | List: |
| References | |
| RIS-02-014, Suppl 1 | |
| Preceding documents: |
|
| Download: ML022740012 (5) | |
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555-0001 September 30, 2002 NRC REGULATORY ISSUE SUMMARY 2002-14, SUPPLEMENT 1 PROPOSED CHANGES TO THE SAFETY SYSTEM UNAVAILABILITY
PERFORMANCE INDICATORS
ADDRESSEES
All holders of operating licenses for nuclear power reactors, except those who have permanently ceased operations and have certified that fuel has been permanently removed from the reactor vessel.
INTENT
The U. S. Nuclear Regulatory Commission (NRC) is issuing this supplement to Regulatory Issue Summary (RIS) 2002-14 to provide to the addressees revised versions of the three attachments to the RIS.
BACKGROUND
Regulatory Issue Summary 2002-14 informed addressees that the NRC was starting a 6-month pilot program on September 1, 2002, to evaluate changes to the safety system unavailability (SSU) performance indicators (PIs), and that the pilot program would be assessed midway through the test period to determine if more than six months were needed to obtain meaningful results. The RIS and its three attachments provided guidance to participating addressees for submitting PI data to the NRC and on the program success criteria.
Addressee participation in the pilot program is voluntary and participants were asked to conform to the guidance in the RIS for the voluntary submission of PI data.
Addressees
were also informed that updated guidance would be provided in the form of revisions to the attachments to the RIS, namely, Attachment 1, an excerpt from Draft NEI 99-02, Rev. 0, Regulatory Assessment Performance Indicator Guideline, Section 2.2, Mitigating System Performance Index, and Attachment 2, Draft NEI 99-02, Rev. 0, Appendix F, Methodologies For Computing the Unavailability Index, the Unreliability Index and Determining Performance Index Validity.
SUMMARY OF ISSUE
Since the issuance of RIS 2002-14 on August 28, 2002, Attachments 1 and 2 have been updated and Attachment 3 has been revised. The revised attachments are attached to this RIS
supplement.
RIS 2002-14, Sup. 1
BACKFIT DISCUSSION
This RIS supplement requires no action or written response. Therefore, the staff did not perform a backfit analysis.
FEDERAL REGISTER NOTIFICATION
A notice of opportunity for public comment was not published in the Federal Register because this RIS supplement is informational.
PAPERWORK REDUCTION ACT STATEMENT
This RIS supplement does not request any information collections.
If there are any questions about this matter, please contact one of the persons listed below.
/Original signed by: TReis/
William D. Beckner, Program Director Operating Reactor Improvements program Division of Regulatory Improvement Programs Office of Nuclear Reactor Regulation Technical contact:
301-415-2956 E-mail: sxs5@nrc.gov Attachments:
1. Draft NEI 99-02, Rev. 0, Regulatory Assessment Performance Indicator Guideline, Section 2.2, Mitigating System Performance Index
2. Draft NEI 99-02, Rev. 0, Regulatory Assessment Performance Indicator Guideline, Appendix F, Methodologies For Computing the Unavailability Index, the Unreliability Index, and Determining Performance Index Validity
3. Mitigating System Performance Index Pilot Program Success Criteria
4. List of Recently Issued NRC Regulatory Issue Summaries
Package ML022740008, ML022740012, ML022740072
- See previous concurrence OFFICE OE:RORP:DRIP
IIPB:DIPM
SC:IIPB:DIPM
BC:IIPM:DIPM
NAME
JWShapaker*
SSanders*
MSatorious*
CCarpenter*
DATE
09/ /2002
09/19/2002
09/26/2002
09/29/2002 OFFICE OGC
SC:RORP:DRIP
PD:RORP:DRIP
NAME
HJMcGurren*
TReis*
WDBeckner*
DATE
09/30/2002
09/30/2002
09/30/2002
Attachment 3 RIS 2002-14, Sup. 1 Mitigating System Performance Index Pilot Program Success Criteria The Mitigating System Performance Index (MSPI) success criteria listed below will be met if there is general agreement among internal and external stakeholders that the criteria have been met.
a. The occurrence of a single failure of an MSPI monitored component by itself, absent any other failures or unavailabilities, should rarely exceed the green/white MSPI threshold as measured from the baseline value. The term rare is defined as minimizing the inconsistencies across plants, within plants, and within systems such that there is no undue burden on resources, and the objective of having consistent publicly displayed results can be achieved.
b. False positive and false negative rates can be established for the chosen statistical method, and instances where the MSPI cannot meet the criteria are rare.
c. Instances where the results from the MSPI calculational methodology are not consistent with the SPAR-3 models are rare and the differences are explainable.
d. The MSPI pilot plant participants can identify and compile the risk significant functions for the monitored systems in a readily inspectable format and can compile a set of predetermined success criteria for those risk significant functions.
e. The active components in the monitored systems are appropriate for inclusion in the MSPI and are a manageable number of components under the MSPI.
f. By the end of the pilot, MSPI data can be accurately reported and quality checked.
g. By the end of the pilot program, inspection procedures and MSPI pilot guidelines are sufficiently detailed to minimize MSPI Questions and NRC feedback forms.
h. MSPI Questions and NRC feedback do not reveal any unresolvable issues.
i. Data collection inconsistencies between the maintenance rule and the MSPI can be reconciled in order to eliminate or significantly reduce separate reporting.
j. Differences between the linear approximation models generated by licensee probabilistic risk assessments and those generated by the NRC SPAR-3 models can be reconciled.
k. The MSPI produces no new unintended consequences that cannot be resolved.
Upon the successful meeting of the success criteria, with a determination that the MSPI pilot is a valid and appropriate means of measuring risk for the monitored systems, the MSPI will suffice as the measure of assessment and not the significance determination process for single failures of the active components within the scope of the MSPI. Any significant problems will be resolved before full MSPI implementation.
______________________________________________________________________________________
OL = Operating License CP = Construction Permit Attachment 4 RIS 2002-14, Sup. 1 LIST OF RECENTLY ISSUED
NRC REGULATORY ISSUE SUMMARIES
_____________________________________________________________________________________
Regulatory Issue Date of Summary No.
Subject Issuance Issued to
_____________________________________________________________________________________
2002-17 Guidance on Performing Military Service Verification
09/19/2002 All holders of operating licenses for nuclear power reactors.
2002-16 Current Incident Response Issues
09/13/2002 All holders of operating licenses for nuclear power plants.
2002-15 NRC Approval of Commercial Data Encryption Systems for the Electronic Transmission of Safeguards Information
08/28/2002 All authorized recipients and holders of sensitive unclassified safeguards information (SGI).
2002-14 Proposed Changes to the Safety System Unavailability Performance Indicators
08/28/2002 All holders of operating licenses for nuclear power reactors, except those who have permanently ceased operations and have certified that fuel has been permanently removed from the reactor vessel.
2002-13 Confirmation of Employment Eligibility
08/27/2002 All holders of operating licenses for nuclear power reactors.
2002-12 NRC Threat Advisory and Protective Measures System Various Various
2002-11 Requalification Program Test Results for Okonite Okolon Single- Conductor Bonded-Jacket Cable (Followup to Regulatory Issue Summary 2000-25)
08/09/2002 All holders operating licenses for nuclear power reactors, except those who have permanently ceased operations and have certified that fuel has been permanently removed from the reactor vessel.
2002-10
Revision of the Skin Dose Limit in
07/09/2002 All U.S. Nuclear Regulatory Commission material licensees.
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