ML103220444
| ML103220444 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 11/18/2010 |
| From: | Gerald Mccoy NRC/RGN-II/DRP/RPB5 |
| To: | Heacock D Virginia Electric & Power Co (VEPCO) |
| References | |
| Download: ML103220444 (28) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION REGION II 245 PEACHTREE CENTER AVENUE NE, SUITE 1200 ATLANTA, GEORGIA 30303-1257 November 18, 2010 Mr. David A. Heacock President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060
SUBJECT:
PUBLIC MEETING
SUMMARY
- NORTH ANNA POWER STATION, DOCKET NOS. 50-338 AND 50-339
Dear Mr. Heacock:
This letter refers to the Category 1 public meeting conducted at your request in the Region II Office on November 17, 2010, at 1:00 p.m. The meetings purpose was to provide an open public forum to discuss the recent discovery and remediation of containment insulation issues at the North Anna Power Station. Enclosed is a list of attendees (Enclosure 1) and the presentation handouts (Enclosure 2).
The meeting was mutually beneficial and provided the NRC staff with an understanding of your goals and direction for the remediation of containment insulation issues at North Anna Power Station.
In accordance with 10 CFR 2.390 of the NRC's "Rules of Practice," a copy of this letter and its enclosure will be available electronically for public inspection in the NRC Public Document Room (PDR) or from the Publicly Available Records (PARS) component of NRC's Agencywide Document Access and Management System (ADAMS). ADAMS is accessible from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).
Should you have any questions concerning this meeting, please contact me at (404) 997-4551.
Sincerely,
/RA/
Gerald J. McCoy, Chief Reactor Projects Branch 5 Division of Reactor Projects Docket Nos.: 50-338, 50-339 License Nos.: NPF-4, NPF-7
Enclosures:
As stated cc w/encl.:
See page 2
VEPCO 2
cc w/encl:
Daniel G. Stoddard, Senior Vice President Nuclear Operations Virginia Electric and Power Company Electronic Mail Distribution Fred Mladen Director, Station Safety & Licensing Virginia Electric and Power Company Electronic Mail Distribution N. L. Lane Site Vice President North Anna Power Station Virginia Electric & Power Company Electronic Mail Distribution Chris L. Funderburk Director, Nuclear Licensing & Operations Support Virginia Electric and Power Company Electronic Mail Distribution Lillian M. Cuoco, Esq.
Senior Counsel Dominion Resources Services, Inc.
Electronic Mail Distribution Executive Vice President Old Dominion Electric Cooperative Electronic Mail Distribution Ginger L. Melton Virginia Electric and Power Company Electronic Mail Distribution Attorney General Supreme Court Building 900 East Main Street Richmond, VA 23219 Senior Resident Inspector North Anna Power Station U.S. Nuclear Regulatory Commission P.O. Box 490 Mineral, VA 23117 Michael M. Cline Director Virginia Department of Emergency Services Management Electronic Mail Distribution County Administrator Louisa County P.O. Box 160 Louisa, VA 23093 Michael Crist Plant Manager North Anna Power Station Virginia Electric & Power Company Electronic Mail Distribution
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- Dominion North Anna Power Station GL 2004-02 (GSI 191)
Larry Lane Site Vice President Dominion Nuclear Safety First
Dominion Timelm e Unit 1 Containment walkdownsfor insulation performedper NEI 02-01 Spring 2003 Unit 2 Containment walkdownsfor insulation performedper NEI 02-01 Spring 2004 GL 2004-02 issued on September 13, 2004 AECL testing ofdebris load identfied Calcium Silicate (Cal-Sil) and Microtherm as particulates that affect RS and LHSI strainers
August 2006 Dominion Nuclear Safety First 2
I 4 ominion Timeline DCP 07-004 removes Cal-Sil and Microtherm on Unit 2. DCP 05-014 installs sump strainers.
- Spring 2007 DCP 07-129 removes Cal-Sil on Unit 1. DCP 05-013 installs sump strainers.
- Fall 2007 Dominion letter summarizes resolution ofGL 2004-02 exceptfor in-vessel effects.
February 2009 Dominion Nuclear Safety First 3
rDominion Timeline
- NRC acknowledges North Anna effort complete exceptfor in-vessel effects.
May 2009 Dominion Nuclear Safety First 4
.sfJ 7
L
IDominion Redesigned Sump NUCLEAR DESIGN INFORMATION PORTAL Figure 6.2-5 ARRANGEMENT CONTAINMENT SUMP STRAINER FOR UNIT 1 0
C Dominion Nuclear Safety First PLAN ELEVATiON 2S-11 6
Dominion Dominion Nuclear Safety First Redesigned Sump 7
Dominion Sump Testing Initial Strainer Sizing Rig #33 Thin Bed RS 2.1 psi LHSI 1.1 psi Full Debris RS 0.14psi LHSI 0.33 psi Dominion Nuclear Safety First 8
Dominion Verfication GSI 191 Implementation Microtherm and Cal-Sil insulation was replaced in the Zones OfInfluence (ZOl)
Physical implementation was completed during 2007 Supplemental Response Serial No. 08-0019 All Microtherm removedfrom Unit 2 with none installed in Unit 1 Dominion Nuclear Safety First 9
Dominion Discovery Neutron Shielding Evaluation
- Unit 2 Spring 2010 RFO boric acid target inspection
- Neutron Saddle Shields degraded
- Subsequent Unit 1 extent ofcondition inspection noted some Neutron Saddle Shields also not intact Dominion Nuclear Safety First 1 0
Domjnie Vessel Shieldi Saddle Shields Aimulus Wall Neutron Saddle Shield Dominion Nuclear Safety First 11
Dominion Discovery Neutron Shielding Evaluation
- Design Change developmentfor removing the Neutron Saddle Shields Reactor Vessel Nozzles
- RCS intermediate loop
- RCP casing Unit 2 was shutdown and inspections identfled Microtherm and Cal-Sil insulation in the ZOl
- Informational Report made to NRC upon shut down of Unit 2 Dominion Nuclear Safety First 1 2
Unit 1 JIVDOmInion Intermediate Elbow Microtherm Removal 1/4 Microtherm encased in metal Dominion UNuclear Safety First 1 3
srDominion Unit 1 RCP Casing Arrow to Panel ofMicrotherm Insulation
Dominion Nuclear Safety First 14
Dominion Unit 1 RCP Casing Arrow to panel ofMicrotherm Insulation Dominion KNuclear Safety First 1 5
Dominion Inspection
- Inspection procedures developed
- Training developed to qualify inspectors
- Complete review ofthe documentation Insulation vendor drawings S& W design changesfor specifications associated with insulation Insulation specification changes Design Changes which could have impacted insulation Dominion Nuclear Safety First 16
Dominion Inspection
- Specialized Inspection Team established QualfIed Inspectors (2), Insulator, QMT Hand-over-hand inspections ofpiing and components Dominion Nuclear Safety First 1 7
Microtherm Cal Sil Unit 1 Unit 2 5811 8ft 3
62ft 3
9ft 3
Dominion Dominion As Found Insulation (Inside Zones ofInfluence)
UNuclear Safety First 18
Dominion Remediation
- Unacceptable insulation (Cal-Sil and/or Microtherm) wasfully remediated when identified during walk downs within the ZOIsfor Unitsl&2
- Microtherm outside ZOl was verified to be encased Dominion Nuclear Safety First 19
Dominion 2-RH-MO V-2 700 Remediated Dominion Nuclear Safety First
Dominion Operabiiity Impact Small break small amount offibrous material does not affect operability Medium break outside testing assumptions Large break outside testing assumptions PRA review appears to be Green Dominion Nuclear Safety First 21
Dominion RCE in Progress Preliminary A flawed methodology used to determine types and quantities of insulation during the GSI-191 containment walkdowns, resulting in unacceptable insulation not being included in the containment debris inventory or subsequently remediated.
Incomplete as-built drawings
Ineffectiveproject management (inventory and remediation)
Ineffective oversight and over-reliance on vendor Dominion Nuclear Safety First
A I
Dominion Corrective iictions Microtherm and Cal-Sil was remediated in Unit 1 and 2 containments Insulation re-inventoried in containment Process improvements initiated
Insulation changes reviewed by Engineeringprior to work and are independently reviewed
Insulation database changes are independently reviewed Pending completion ofRCEOO1O3O LER submittal by 11/23/10 GL 2004-02 Response will be updated Dominion Nuclear Safety First
Dominion Conc/usion
- Extent ofconditionfor both units was promptlypursued
- Conservative decision making employed to shutdown and inspect Unit 2
- All discrepancies werefully remediated
IDominion Questions?
Dominion Nuclear Safety First 25