ML102780072
| ML102780072 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/04/2010 |
| From: | Reyes L Region 2 Administrator |
| To: | Crowe E Division Reactor Projects II |
| References | |
| Download: ML102780072 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION REGION II 245 PEACHTREE CENTER AVENUE NE, SUITE 1200 ATLANTA, GEORGIA 30303-1257 October 4, 2010 MEMORANDUM TO:
Eddy Crowe Senior Resident Inspector Farley Nuclear Station FROM:
Luis A. Reyes /RA/
Regional Administrator
SUBJECT:
NORTH ANNA SPECIAL INSPECTION CHARTER You have been selected to lead a Special Inspection to assess the circumstances surrounding the discovery of Microtherm insulation in the containment of North Anna Power Station Units 1 and 2 on September 27, 2010. The licensees analysis for ECCS sump performance indicates that no Microtherm is to be present in containment. Your onsite inspection should begin on October 4, 2010. Jason Eargle will be assisting you in this inspection.
A.
Basis On September 22, 2010, engineers developing a modification at North Anna Power Station identified that Microtherm insulation may be installed on the Unit 1 reactor pressure vessel nozzles. The licensees analysis for debris generation due to a loss of coolant (LOCA) accident within containment did not account for any Microtherm insulation inside containment and subsequently this analysis was the basis for their submission to the NRC in response to Generic Letter 2004-02. Based on this discovery, the licensee performed further reviews which identified that Microtherm insulation was also potentially installed in other locations within both Unit 1 and Unit 2 containments.
Unit 2 was shutdown on September 29, 2010 in order to investigate the potential presence of Microtherm insulation. Inspections in containment have subsequently confirmed the presence of Microtherm insulation in both Unit 1 and Unit 2 containments.
In accordance with Management Directive 8.3, ANRC Incident Investigation Program,@
deterministic and conditional risk criteria were used to evaluate the level of NRC response for this operational event. One deterministic criterion was met. This issue involved operations that exceeded or were not included in the design bases of the facility. The analysis for the debris generation due to a LOCA within containment performed by the licensee in support of the GL 2004-02 response did not allow for the presence of Microtherm insulation inside of containment. The conditional core damage probability (CCDP) for the condition met the criterion for a Special Inspection. Region II determined that the appropriate level of NRC response was to conduct a Special Inspection.
CONTACT:
Gerald McCoy, RII/DRP/BR5 (404) 997-4551
E. Crowe 2
This Special Inspection is chartered to review the circumstances surrounding the identification of Microtherm insulation inside the North Anna Unit 1 and Unit 2 containments. In addition, the team will review the licensees modifications to analyze for or remove this insulation prior to plant operation.
B.
Scope This inspection is expected to perform data gathering and fact-finding activities in order to address the following:
- 1. Develop a sequence of the events which lead to the discovery of Microtherm insulation inside containment.
- 2. Review the methodology used by the licensee to develop their response to GL 2004-02. Specifically assess why the licensee did not identify the presence of unanalyzed insulation inside containment.
- 3. Review the adequacy of the licensees efforts to identify all the unanalyzed insulation inside containment subsequent to this discovery.
- 4. Review the licensees corrective actions to address unanalyzed insulation in containment. As applicable, review any modifications the licensee developed for the removal of Microtherm in containment.
- 5. Identify any potential generic safety issues and make recommendations for appropriate follow-up action (e.g., Information Notices, Generic Letters, and Bulletins).
C.
Guidance Inspection Procedure (IP) 93812, "Special Inspection," provides additional guidance to be used during the conduct of the Special Inspection. Your duties will be as described in IP 93812. The inspection should emphasize fact-finding in its review of the circumstances surrounding the event. Safety or security concerns identified that are not directly related to the event should be reported to the Region II office for appropriate action.
You will report to the site, conduct an entrance, and begin inspection no later than October 4, 2010. It is anticipated that the on-site portion of the inspection will be completed during this week. A daily status briefing of Region II management will be provided beginning the second day on-site at approximately 4:00 p.m. In accordance with IP 93812, you should promptly recommend a change in inspection scope or escalation if information indicates that the assumptions utilized in the MD 8.3 risk analysis were not accurate. A report documenting the results of the inspection should be issued within 45 days of the completion of the inspection. The report should address all the applicable areas specified in section 3.02 of Inspection Procedure 93812. At the completion of the inspection you should provide recommendations for improving the Reactor Oversight Process baseline inspection procedures and the Special Inspection process based on any lessons learned.
E. Crowe 3
This charter may be modified should you develop significant new information that warrants review. Should you have any questions concerning this Charter, contact Gerald McCoy at (404) 997-4551.
Docket Nos.: 50-338, 50-339 License Nos.: NPF-4, NPF-7 cc:
R. Borchardt, EDO M. Virgilio, DEDR L. Reyes, RII V. McCree, RII L. Wert. RII C. Miller, RII G. McCoy, RII B. Desai, RII J. Thorpe, NRR V. Sreenivas, NRR NRR_Reactive_Inspection@NRC.gov
G SUNSI REVIEW COMPLETE OFFICE RII:DRP RII:DRP RII:DRP NRR:DSS/SSIB RII:ORA SIGNATURE
/RA/
/RA/
/RA by McCoy/
/RA by McCoy/
/RA By Reyes/
NAME GMcCoy LWert ECrowe SBailey VMcCree DATE 10/4/10 10/4/10 10/4/10 10/4/10 10/4/10 10/ /2010 E-MAIL COPY?
YES NO YES NO YES NO YES NO YES NO YES NO YES NO