ML103220444

Public Meeting Summary - North Anna Power Station

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: Michael M. Cline Daniel G. Stoddard, Director Senior Vice President Virginia Department of Emergency Services Nuclear Operations Management Virginia Electric and Power Company Electronic Mail Distribution Electronic Mail Distribution County Administrator Fred Mladen Louisa County Director, Station Safety & Licensing P.O. Box 160 Virginia Electric and Power Company Louisa, VA 23093 Electronic Mail Distribution Michael Crist N. L. Lane Plant Manager Site Vice President North Anna Power Station North Anna Power Station Virginia Electric & Power Company Virginia Electric & Power Company Electronic Mail Distribution 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

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• Dominion North A nna Power Station GL 2004-02 (GSI 191)

Larry Lane Site Vice President Dominion Nuclear Safety First Enclosure 2

Dominion Timelm e

• Unit 1 Containment walkdownsfor insulation performed per NEI 02-01 Spring 2003

• Unit 2 Containment walkdowns for insulation performed per 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 Enclosure 2

I ominion 4 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 of GL 2004-02 exceptfor in-vessel effects.

February 2009 Dominion Nuclear Safety First 3 Enclosure 2

rDominion Timeline

• NRC acknowledges North Anna effort complete exceptfor in-vessel effects. May 2009 Dominion Nuclear Safety First 4 Enclosure 2

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L Enclosure 2

IDominion Redesigned Sump NUCLEAR DESIGN INFORMATION PORTAL Figure 6.2-5 ARRANGEMENT CONTAINMENT SUMP STRAINER FOR UNIT 1 0

C PLAN ELEVATiON 2S-11 Dominion Nuclear Safety First 6 Enclosure 2

Dominion Redesigned Sump Dominion Nuclear Safety First 7 Enclosure 2

Dominion Sump Testing Initial Strainer Sizing Rig #33 Thin Bed RS 2.1 psi LHSI 1.1 psi Full Debris RS 0.14 psi LHSI 0.33 psi Dominion Nuclear Safety First 8 Enclosure 2

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 Enclosure 2

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 10 Enclosure 2

Domjnie Neutron Saddle Shield Saddle Shields Vessel Shieldi Aimulus Wall Dominion Nuclear Safety First 11 Enclosure 2

Dominion Disco very Neutron Shielding Evaluation

• Design Change development for 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 12 Enclosure 2

Unit 1 Intermediate Elbow Microtherm Removal JIVDOmI nion 1/4 Micro therm encased in metal Dominion U

Nuclear Safety First 13 Enclosure 2

Unit 1 RCP Casing srDomi nion Arrow to Panel ofMicrotherm Insulation Dominion Nuclear Safety First 14 Enclosure 2

Unit 1 RCP Casing Dominion Arrow to panel ofMicrotherm Insulation Dominion K

Nuclear Safety First 15 Enclosure 2

Dominion Inspection

• Inspection procedures developed

• Training developed to qualify inspectors

• Complete review of the documentation Insulation vendor drawings S& W design changes for specifications associated with insulation Insulation specification changes Design Changes which could have impacted insulation Dominion Nuclear Safety First 16 Enclosure 2

Dominion Inspection

• Specialized Inspection Team established QualfIed Inspectors (2), Insulator, QMT Hand-over-hand inspections ofpiing and components Dominion Nuclear Safety First 17 Enclosure 2

As Found Insulation Dominion (Inside Zones ofInfluence)

Unit 1 Unit 2 Microtherm 5811 3 62ft Cal Sil 3 8ft 3 9ft Dominion U

Nuclear Safety First 18 Enclosure 2

Dominion Remediation

• Unacceptable insulation (Cal-Sil and/or Microtherm) was fully remediated when identified during walk downs within the ZOIs for Unitsl&2

• Microtherm outside ZOl was verified to be encased Dominion Nuclear Safety First 19 Enclosure 2

Dominion 2-RH-MO V-2 700 Remedia ted Dominion Nuclear Safety First Enclosure 2

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 Enclosure 2

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 Ineffective project management (inventory and remediation)

Ineffective oversight and over-reliance on vendor Dominion Nuclear Safety First Enclosure 2

I Dominion Corrective ii c ti ons A

• Microtherm and Cal-Sil was remediated in Unit 1 and 2 containments

• Insulation re-inventoried in containment

• Process improvements initiated Insulation changes reviewed by Engineering prior 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 Enclosure 2

Dominion Con c/usion

• Extent ofcondition for both units was promptly pursued

• Conservative decision making employed to shutdown and inspect Unit 2

• All discrepancies werefully remediated

• Unit 1 and 2 containment sumps are operable Dominion Nuclear Safety First Enclosure 2

IDominion Questions?

Dominion Nuclear Safety First 25 Enclosure 2