[Federal Register Volume 69, Number 75 (Monday, April 19, 2004)]
[Notices]
[Pages 20953-20954]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-8749]
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NUCLEAR REGULATORY COMMISSION
Report on the Independent Verification of the Mitigating Systems
Performance Index (MSPI) Results for the Pilot Plants
AGENCY: Nuclear Regulatory Commission.
ACTION: Request for comment.
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SUMMARY: The Nuclear Regulatory Commission is announcing the
availability of the draft document entitled: ``Report on the
Independent Verification of the Mitigating Systems Performance Index
(MSPI) Results for the Pilot Plants,'' dated February 2004 for review
and comment by external stakeholders. Interested individuals may obtain
a copy of this document from ADAMS Accession ML040550036 via the public
web site, or from the person identified under the caption: FOR FURTHER
INFORMATION CONTACT.
DATES: Submit comments by June 15, 2004. Comments received after this
date will be considered if it is practical to do so, but the Commission
is able to ensure consideration only for comments received on or before
this date.
ADDRESSES: Submit comments to: Chief, Rules and Directives Branch, U.S.
Nuclear Regulatory Commission, Washington, DC 20555-0001.
Deliver comments to: 11545 Rockville Pike, Rockville, Maryland,
between 7:30 a.m. and 4:15 p.m. Federal workdays.
The draft document and certain other documents related to this
action, including comments received, may be examined in the NRC Public
Document Room, 11555 Rockville Pike, Rockville, Maryland.
FOR FURTHER INFORMATION CONTACT: Donald A. Dube, Division of Risk
Analysis and Applications, Office of Nuclear Regulatory Research, U.S.
Nuclear Regulatory Commission, Washington, DC 20555-0001. Telephone:
301-415-5472, e-mail: [email protected].
SUPPLEMENTARY INFORMATION: The Reactor Oversight Process (ROP) was
created four years ago to improve the NRC's regulatory oversight of
licensee operation of commercial nuclear power plants. It is intended
to better risk-inform agency actions and bring more objectivity to the
regulatory process. The ROP is consistent with the goals of the
Commission's Probabilistic Risk Assessment (PRA) Policy Statement and
the NRC's Strategic Plan (NUREG-1614), which include increased use of
the PRA technology in ``* * * regulatory matters to the extent
supported by the state-of-the-art in PRA methods and data and in a
manner that complements the NRC's deterministic approach and supports
the NRC's traditional defense-in-depth philosophy.'' The ROP is
reflective of the NRC's efforts to better risk-inform its core
processes.
SECY-99-007 and 99-007A, ``Recommendations for Reactor Oversight
Process Improvements,'' described the ROP. The ROP was implemented in
April 2000 following a six-month pilot program conducted in 1999. The
results of this pilot program were described in SECY-00-0049, ``Results
of the Revised Reactor Oversight Process Pilot Program.'' A fundamental
aspect of the ROP is the use of both performance indicators and
inspection findings to determine whether the objectives of the ROP's
cornerstones of safety are being met on a plant-specific basis.
In light of the movement toward more risk-informed and performance-
based oversight, draft Risk-Based Performance Indicators (RBPI) were
developed to (1) address specific areas in the current ROP that were
identified in SECY-00-0049 as possible enhancements and (2) potentially
support any future development of performance indicators using improved
risk analysis tools. NUREG-1753, ``Risk-Based Performance Indicators:
Results of Phase 1 Development,'' discussed the technical feasibility
of using available risk models and data to enhance the NRC's ability to
monitor plant-specific safety performance of reactors in a risk-
informed and performance-based manner. This development activity was
designed to fit into the ROP concept for indicators, thresholds, and
performance monitoring while continuing to move the NRC's programs
forward in accordance with the PRA Policy Statement and the goals of
the Strategic Plan.
The Mitigating Systems Performance Index (MSPI) builds upon the
insights and findings developed in the RBPI Program as discussed in
NUREG-1753. The MSPI is described in ``NRC Regulatory Issue Summary
2002-14, Supplement 1 Proposed Changes to the Safety System
Unavailability Performance Indicators,'' Attachments 1 and 2, draft NEI
99-02, Rev. 0, ``Regulatory Assessment Performance
[[Page 20954]]
Indicator Guideline,'' Section 2.2 ``Mitigating Systems Performance
Index'' and Appendix F ``Methodologies for Computing the Unavailability
Index, the Unreliability Index, and Determining Performance Index
Validity''.
The MSPI was developed as a potential replacement for the Safety
System Unavailability (SSU) performance indicator. The purpose of the
MSPI is to ``monitor the performance of selected systems based on their
ability to perform risk-significant functions * * *'' The NRC's Office
of Nuclear Regulatory Research developed the MSPI to address several
specific problems with the currently used performance indicators
including: the use of fault exposure hours in the SSU, the omission of
unreliability elements in the indicator, the use of mostly one-size-
fits-all performance thresholds irrespective of risk-significance of
the system, and the cascading of support system failures onto
mitigating system unavailability. A twelve-month pilot program on the
MSPI consisting of twenty nuclear power plant units was initiated in
September of 2002. For the first six months, licensees submitted system
and component performance data, and exercised the MSPI algorithm. Over
the second six months of the pilot, the NRC staff worked to fully
assess the results as well as to identify technical issues and to
provide recommendations for their resolution. Numerous meetings
involving both internal and external stakeholders have been held to
discuss developmental details of the MSPI. The MSPI was extensively
tested, evaluated, and reviewed during the pilot plant trial and
evaluation period. Although the NRC staff recently announced that use
of the MSPI in the ROP, as piloted, would not be pursued further, the
subject draft report is being made available to document the results of
the NRC evaluation of technical issues and detailed proposed changes to
the MSPI methodology. The report can be found as ADAMS Accession
ML040550036 via the NRC public Web site at http://www.nrc.gov.
A briefing on the results of the MSPI pilot before the Advisory
Committee on Reactor Safeguards Subcommittee on Reliability and PRA,
and Plant Operations, is currently scheduled for April 14, 2004 from 8
a.m. to 11 a.m. at NRC Headquarters in T2B3 of Two White Flint,
Rockville, MD. Separately, the Office of Nuclear Reactor Regulation
intends to document the concerns with the piloted MSPI and conduct a
public meeting to solicit further stakeholder input regarding the MSPI.
Information regarding this public meeting will be provided at a later
date.
At this time, we are interested in comments regarding all aspects
of the subject report, particularly the following areas:
Fundamental mathematical formulation of the
MSPI.
Recommended improvements to the originally
formulated MSPI methodology per draft revision to NEI 99-02.
Overall technical findings and results of the
MSPI pilot, including validity of MSPI outcomes.
Dated at Rockville, Maryland, this 7th day of April, 2004.
For the Nuclear Regulatory Commission.
Charles E. Ader,
Director, Division of Risk Analysis and Applications, Office of Nuclear
Regulatory Research.
[FR Doc. 04-8749 Filed 4-16-04; 8:45 am]
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