ML20125A799

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Summary of 921119 Meeting W/Util in Rockville,Md Re Local Leak Rate Testing of Containment Penetration Bellows at Plant,Per NRC Info Notice 92-020
ML20125A799
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 12/02/1992
From: Hopkins J
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
IEIN-92-020, IEIN-92-20, NUDOCS 9212090060
Download: ML20125A799 (13)


Text

December 2, i992 DISTRIBUTION Docket No. 50-346 Docket File OGC NRC & Local PDRs ACRS(10)

PD111-3 Reading JHannon LICENSEE: TOLEDO EDISON COMPANY TMurley/FMiraglia PKreutzer JPartlow JHopkins FAtiLITY: DAVIS-BESSE NUCLEAR POWER STATION, UNIT 1 JRoe EJordan TKing GGrant,EDO

SUBJECT:

SUMMARY

OF MEETING HELD ON NOVEMBER 19, 1992 RGN III.DPR TO DISCUSS CONTAINMENT PENETRATION BELLOWS LOCAL LEAR RATE TESTING (IN 92-20)

On November 19, 1992, NRC staff members met at Rockville, Maryland, with employees of Toledo Edison Company (TE) to discuss local leak rate testing of containment penetration bellows at the Davis-Besse Nuclear Power Station, Unit 1. A list of attendees is included as enclosure 1. The handout used at the meeting is included as enclosure 2.

Davis-Besse has four containment penetrations for the feedwater and steam lines that have bellows. The bellows sizes are 40 inches and 60 inches. TE plans to perform the next Type B local leak rate tests (LLRTS) of these penetrations in a manner to check that test pressure propagates through the entire length of the bellows. If the LLRT proves inadecuate, then TE might ask for an wsption based, in part, on their integratec leak rate test (ILRT) history. However, an ILRT is not planned to be performed during the upcoming refueling outage. The NRC staff asked what would be the radiation exposure if cne of the tests was performed at power instead of waiting for the refueling outage. The NRC staff also asked what would be the acceptance criteria for this method of testing and if helium would be used for the test. The staff encouraged the licensee to continue to work on this issue including contingency test approaches or penetration bellows replacement in case the LLRTs prove inadequate. TE stated that they will continue to work on the issue and that they would get back to the staff with the information requested.

original signed by Jon B. Hopkins, Sr. Project Manager Project Directorate III-3 Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosures:

As stated cc w/ enclosure:

Seu next page ,

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  • December 2, 1992 w

a D111BJJWIJDif Docket No. 50-346 Docket filer 0GC NRC & Local PDRs ACRS(10)

PDill-3 Reading JHannon LICENSEE: TOLEDO EDIS0N COMPANY TMurley/FMiraglia PKreutzer JPartlow JHopkins FACILITY: DAVIS-BESSE NUCLEAR POWER STATION, UNIT 1 JRoe EJordan TKing GGrant,EDO .

SUBJECT:

SUMMARY

OF MEETING HELD ON NOVEMBER 19, 1992 RGN lil,DPR TO DISCUSS CONTAINMENT PENETRATION BELLOWS LOCAL LEAK RATE TESTING (IN 92-20)

On November 19, 1992, NRC staff members met at Rockville, Maryland, with employees of Toledo Edison Company (TE) to discuss local leak rate testing of containment penetration bellows at the Davis-Besse Nuclear Power Station, Unit 1. A list of attendees is included as enclosure 1. The handout used at the meeting is included as enclosure 2.

Davis-Besse has four containment penetrations for the feedwater and steam lines that have bellows. The bellows sizes are 40 inches and 60 inches. TE plans to perform the next Type B local leak rate tests (LLRTs) of these penetrations in a manner to check that test pressure propagates through the entire length of the bellows. If the LLRT proves inadequate, then TE might ask for an exemption based, in part, on their integrated leak rate test (ILRT) history. However, an ILRT is not planned to be performed during the upcoming refueling outage. The NRC staff asked what would be the radiation exposure if one of the tests was performed at power instead of waiting for the refueling outage. The NRC staff also asked what would be the acceptance criteria for this methr:i of testing and if helium would be used for the test. The staff encouraged the licensee to continue to work on this issue including contingency test approaches or penetration bellows replacement in case the LLRTs prove inadequate. TE stated that they will c.ontinue to work on the issue and that they would get back to the staff with the info'mation requested, original signed by Jon B. Hopkins, Sr. Project Manager Project Directorate 111-3 Division of Reactor Projects Ill/IV/V Office of Nuclear Reactor Regulation

Enclosures:

As stated cc w/ enclosure:

See next page OFFICE PDill-3:LA:DRPW PD!Il-3:PM:DRPW PDIII-3: Ph;/)RPW NAME PKreutzer JBHopkins/jbh 3M JHannon[

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  • % , , , , , M December 2. 1992 Docket No. 50-346 ,

LICENSEE: TOLEDO EDISON COMPANY FACILITY: DAVIS-BESSE NUCLEAR POWER STATION, UNIT 1

SUBJECT:

SUMMARY

Of HEETING HELD ON NOVEMBER 19, 1992 TO DISCUSS CONTAINMENT PENETPATION BELLOWS LOCAL LEAK RATE TESTING (l;i 92-20)

On November 19, 1992, NRC staff members met at Rockville, Maryland, with employees of Toledo Edison Company (TE) to discuss local leak rate testing of containment penetration bellows at the Davis-Besse Nuclear Power Station, Unit 1. A list of attendees is included as enclosure 1. The handout used at the meeting is included as enclosure 2.

Davis-Besse has four containment penetrations for the feedwater and steam lines that have bellows. The bellows sizra are 40 inches and 60 inches. TE plans to perform the next Type B local leak rate tests (LLRTs) of these penetrations in a manner to check that test pressure propagates through the entire length of the bellows. If the LLRT proves inadequate, then TE might ask for an exemption based, in part, on their integrated leak rate test (ILRT) history. However, an ILRT is not planned to be performed during the upcoming refueling outage. The NRC staff asked what would be the radiation exposure if one of the tests was performed at power instead of waiting for the refueling outage. The NRC staff also asked what would be the acceptance criteria for this method of testing and if helium would be used for the test. Thu staff encouraged the licensee to continue to work on this issue including contingency test approaches or penetration bellows replacement in case the LLRTs prove inadequate. TE stated that they will continue to work on the issue and that they would get back to the staff with the information requested.

37 '

f Jon B. Hopkins, Sr, Project Manager Project Directorate 111-3 Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosures:

As stated cc w/ enclosure:

See next page l

A F

Hr. Donald C. Shelton Davis-Besse Nuclear Power Station Toledo Edison Company Unit No. I cc:

Mary E. O'Reilly Centerior Energy Corporation Radiological Health Program 300 Madison Avenue Ohio Department of Health Toledo, Ohio 43652 Post Office Box 118 Columbus, Ohio 43266-0149 Mr. Robert W. Schrauder Attorney General .

Manager, Nuclear Licensing Department of Attorney Toledo Edison Company General 300 Madison Avenue 30 East Broad Street Toledo, Ohio 43652 Columbus, Ohio 43215 Mr. James W. Harris, Director Gerald Charnoff, Esq. Division of Power Generation Shaw, Pittman, Potts Ohio Department of Industrial Regulations and Trowbridge P. O. Box 825 2300 N Street, N.W. Columbus, Ohio 43216 Washington, D.C. 20037 Regional Administrator, Region 111 Ohio Environmental Protection Agency U.S. Nuclear Regulatory Commission DERR--Compliance Unit 199 Roosevelt Road ATTN: Zack A. Clayton Glen Ellyn, Illinois 60137 P. O. Box 1049 Columbus, Ohio 43266-0149 Mr. Robert B. Borsum Babcock & Wilcox President, Board of Ottawa Nuclear Power Generation Division County Commissioners 1700 Rockville Pike, Suite 525 Port Clinton, Ohio 43452 Rockville, MD 20852 Resident inspector State of Ohio V. S. Nuclear Regulatory Commission Public Utilities Commission 5503 N. State Route 2 180 East Broad Street Oak Harbor, Ohio 43449 Columbus, Ohio 43266-0573 Mr. Hurray R. Edelman Mr.-James R. Williams Executive Vice President - State Liaison to the NRC Power Generation Adjutant General's Department Centerior Service Company Office of Emergency Management Agency 6200 Oak Tree Boulevard 2825 West Granville Road Independence, Ohio 44101 Columbus, Ohio 43235-2712 l

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., Enclosure 1 l ATTENDEES November 19, 1992 NAME Q8GANIZATION ,

J. Hopkins NRC P. Smith TE E. Caba . TE -

J. Hannon NRC J. Kudrick NRC J. Pulsipher NRC H. Schreiber TE J. Barron TE L

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CENTElh$hy c >

1 Pnclosure 2 l To eco Ecison V ee':ing wi: 1 h 9C on Javis-3 esse Resconse to In'ormation No': ice 92-20 Con':ainment Pene':ra': ion Be ows

\ ovem aer 19, ' 992 l

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Purpose Present Toledo Edison's actions to address -

IN 92-20 for Davis-Besse Actions taken to date Planned actions considering Refueling Outage Schedule and Accessibility Resources Pot':ntial Need for any Regulatory Action l

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BACKGROUND IN 92-20 identifies containment below LLRT problems at Quad Cities (March 1992) lack of flow path between plies of bellows Davis-Besse also has Pathway bellows (later design tMn Quad Cities)

Same LLRT test method LLRT required during 8RFO (non-ILRT outage)

No bellows integrity problem based on-five past ILRTs 6.N i

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I BACKGROUND Davis-Besse Orientation

  • Large steel containment with Shield Building (one of nine operating plants)
  • Emergency Ventilation System
  • No unfiltered leakage path from bellows
  • Limited access except during refueling outages
  • High Pa (38 psig) i I

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CENTE R AC-~ O NS ~~AKE N TO DATE Parallel Paths Validation of Current Test Method Consider Modifications / Alternative Tests Simple alternative tests complicated by

  • non-concentric configurations
  • high Pa (eliminates inflatable seal) 7 Bids - all cumbersome modifications
  • hi')h initial cost
  • repetitive costs Surveyed other utilities (different situations)

Modifications currently last resort

camsgghy l e >

8RFO Validate Current Test Method

  • demonstrate gap in existing bellows  ;

> bellows design

> installed configuration ,

  • If successful, accept current method as valid 9

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9RFO { Contingent}

lLRT outage Investigate / Develop Alternative Test Methods

  • Gas Sniffing
  • Reduced Pressure LLRT f

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'%annu REGU _ATORY IMPLICATIONS Type B LLRT Exemption

  • 8RFO if test validation questionable
  • 9RFO (based on ILRT) l h

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