ML022740094

Meeting Handouts to Discuss Duke Energy'S Approach for Control Room in Leakage Testing to Be Performed at Catawba Units 1 & 2

ML022740094
Person / Time
Site:	Catawba
Issue date:	09/27/2002
From:	Chandu Patel NRC/NRR/DLPM/LPD2
To:
References
Download: ML022740094 (11)

Text

NRC FORM 658 U.S. NUCLEAR REGULATORY COMMISSION (9-1999)

TRANSMITTAL OF MEETING HANDOUT MATERIALS FOR IMMEDIATE PLACEMENT IN THE PUBLIC DOMAIN This form is to be filled out (typed orhand-printed)by the person who announced the meeting (i.e., the person whoiissuedthe meeting notice). The completed form, and the attachedcopy of meeting handout materials, will be sent to the Document Control Desk on the same day of the meeting; under no circumstanceswill this be done later than the working day after the meeting.

Do not include proprietarymaterials.

DATE OF MEETING S1,2:.7 The attached document(s), which was/were handed out in this meeting, is/are to be placed in the public domain as soon as possible. The minutes of the meeting will be issued in the near future. Following are administrative details regarding this meeting:

Docket Number(s) _VT ..L* 2 ,' '* - , L4 Plant/Facility Name Coac.. boA.. NL4c1.e.v StnK^, L)Y"4-J I4-2.

TAC Number(s) (if available)

Reference Meeting Notice Ie*P..-.

• - (4, aLoc" Purpose of Meeting (copy from meeting notice) 7L CU. C-t.jj L"&u FE,', q NAME OF PERSON WHO ISSUED MEETING NOTICE TITLE OFFICE DIVISION '" U . * * "'e "

BRANCH Distribution of this form and attachments:

Docket File/Central File PUBLIC ,

NRC FORM 658 (9-1999) PRINTED ON RECYCLED PAPER Thils form was de*signed using In~rmsOIi

Control0-Room Ventilation Testingi 09127/02 1:00 PM to 3:30 PM "Washington,DC Meeting requested by:,'.* Duke Energy Type of meeting: Working level Attendees: NRC: Chandu Patel, Jack Hayes, Harold Walker Duke: Margaret Chernoff, Steve Schultz, Jim Kammer, Robert Banker Agenda topics,,

1:00-1:10 PM Introductions Jim Kammer 1:10-1:20 PM Meeting Overview Jim Kammer 1:20-2:15 PM Control Room Unfiltered Inleakage Test/Analysis Results Jim Kammer 2:15-2:25 PM Break 2:25-3:00 PM Potential Testing and Modifications to Resolve Issue 'Jim Kammer 3:00-3:25 PM General Discussion 3:25-3:30 PM - Closing Comments Jim Kammer 3:30 PM - Adjourn -

1:10o-1:20 PM ,- Meeting Overview Jim Kaminer Discussion:

July 2001 NRC/Duke Meeting on planned Control Room Unfiltered Inleakage Testing February 2002 NRC/Duke Meeting on Control Room Unfiltered Inleakage Testing Results Fuel Handling Accident Analysis License Amendment Granted Unfiltered Inleakage Results accepted for FIA only Catawba LARS (Current) - Expected 1112002 submittal Annulus Ventilation Auxiliary Building Ventilation UFSAR LBLOCA Dose Analysis - (reconstitution effort completed)

Resolution of Unfiltered Inleakage Testing Results for Catawba NRC Acceptance of "Current" Control Room Unfiltered Test Results (Preferred) 100 CFM Unfiltered Inleakage Value validated by Integrated Component Test/Analysis (With Margin)

Tracer Gas Test demonstrated no significant error in Integrated Component Test Approach at CNS LBLOCA Analysis demonstrates significant margin to GDC 19 limits Accomplished intent of NRC Control Room Habitability Initiative Re-perform Control Room Tracer Gas Test (Alternate)

Temporarily Modify Control Room Ventilation System Perform Tracer Gas Test Remove Temporary Modification Submit LAR to Revise Control Room Ventilation Technical Specifications NRC Review, Approval and Issuance of LAR Permanently Modify Control Room Ventilation System

Conclusions:

Action items: Person responsible: Deadline:

1:20-1:35 PM Integrated Component Test Development & Execution Jim Kammer Discussion:

Reviewed CNS Control Room Ventilation System and Pressure Boundary Design Identified System/Envelope Design Vulnerabilities where current Technical Specification Pressurization Surveillance was not adequate to demonstrate Unfiltered Inleakage within value assumed in Dose Analysis Developed an Integrated Component Test (ANSI N-5 10, constant pressure method) to conservatively demonstrate that the potential unfiltered inleakage from these design vulnerabilities were bounded by the value assumed in the Dose Analysis.

Performed Integrated Component Test Three test sections "A" Train 13.0 +/- 0.4 scfm @ 7.0 inwc =16 scfm @ 10.0 inwc "B" Train 15.5 +/- 0.4 scfm @ 7.0 inwc =19 scfm @ 10.0 inwc CRA Ductwork 19.5 +/- 0.4 scfm @ 2.5 inwc = 19.5 scfm @ 2.5 inwc Total Duct Inleakage 40 scfm (maximum of "A" or "B" Train + CRA)

Test Findings "A" Train Minor leakage found/repaired on discharge of PFT fan. Would not have resulted in unfiltered inleakage.

"B" Train Leakage found/repaired at PFT Discharge damper. Attributed to inadequate damper repair in 1980's.

(Not unfiltered inleakage. Prior to establishment of current HVAC Duct maintenance program)

"CRA" Leakage found and repaired at electrical heater box (design deficiency), damper shafts. (Unfiltered inleakage)

==

Conclusions:==

Test combined with analysis of Instrument Air Leakage adequate to quantify unfiltered inleakage Test was conducted "As-Found" (ie no preconditioning).

Current Maintenance Program validated as adequate to maintain duct integrity.

Conclusions:

Action items: Person responsible: Deadline:

1:35-1:55 PM Tracer Gas Test Development & Execution Jim Kammer Discussion:

Reviewed CNS Control Room Ventilation System and Pressure Boundary Design with Test Vendor Developed ASTM E-741 Test Protocol that tested five Control Room Ventilation System Alignments Overall Leakage Individual Flows Results indicate significant problems in measuring system flows using tracer gas technology Attributed to inadequate duct lengths for adequate injection, mixing, and sampling Vendor Test Results calculated by using best estimates of flows from tracer gas flow measurements Tracer Gas Test Results indicate no significant unfiltered inleakage validating Integrated Component Test Methodolgy.

Envelope Leak Flow Outside Air Est CRA Recirculation Unfiltered Leakage "A" Normal 2946 +/- 100 scfm 2803 scfm 505 scfm -360 scfm "A" Maintenance 3219 +/- 93 scfm 2709 scfm 480 scfm 30 scfm "B" Normal 2647 +/- 92 scfm 2494 scfm 386 scfm -230 scfm "B" Maintenance 3020 +/- 110 scfm 2536 scfm 588 scfm -100 scfm "A" + "B" (ESF No Failures) 5168 +/- 180 scfm 3826 scfm 1390 scfm -48 scfm Engineering Issues with Tracer Gas Test PFT to CRA Flow Path complicates test conduct and requires numerous flow rates to be measured.

Several flows could not be measured accurately due to either injection point location or inadequate mixing. (See attached table of tracer gas flow measurements versus AFMD Flow Measurements.)

Limited Control Room Access to ensure best possible results Poor Test Accuracy

Conclusions:

Action items: Person responsible:

Catawba Nuclear Station Tracer Gas Flow Measurement Data August 2001 Test Data "A" Normal "B" Normal "A" Normal "B" Maintenance "B" Normal "A" Maintenance

_,____- __ Tracer Gas AFMD TracerGas -,.-AFMD..... TracerGas ,....AFMD- TracerGas ,AFMD PFT CR Flow 4868 4540 5093 4480 3800 4640 NM 4590 PFT CRA Flow 1697 1563 1841 1546 1260 1220 NM 1230 A Intake 2236 1390 2184 1510 1410 1535 1215 1606 B Intake 1095 762 1120 757 1084 752 1910 955 A Recirc 1171 1440 995 1455 927 1247 1115 1400 B Recirc 848 1064 923 1017 623 1292 1237 1440

1:55-2:00 PM LBLOCA Dose Analysis Reconstitution - Jim Kammer' Discussion:

Assumed 100 cfm unfiltered inieakge Performed conservatively using RG 1.183, NEI 99-03, and DG 1111 methodology, combined with NRC draft guidance provided through the NEI/NRC CRH interaction process.

Results demonstrate significant margin to GDC 19 limits

Conclusions:

Action items: Person responsible: Deadline:

2:00-2:15 PM Summary and Conclusions Jim Kammer Discussion:

Integrated Component Test Development & Execution was rigorously developed using:

Internal System Knowledge & Experience Duke Energy Control Room Ventilation Testing Experience (Oconee)

Industry Experience (NRC, INPO, Industry Groups (NHUG), NEI 99-03 (Draft))

Integrated Component Test Results Indicate CNS Welded Ductwork:

Quality Materials & Installation Low leakage characteristics Robust 20 years of service Integrated Component Test Results Indicate Test combined with analysis of Instrument Air Leakage adequate to quantify unfiltered inleakage Test was conducted "As-Found" (ie no preconditioning).

Current Maintenance Program validated as adequate to maintain duct integrity.

Maintenance Program enhancements implemented based on testing experience Tracer Gas Test Results Indicate CNS Control Room Envelope is tight Indicate no major oversight in development of Integrated Component Test Poor Test Accuracy makes comparison to Integrated Component Test Difficult Dose Analysis Results Demonstrate significant margin to GDC 19 Limits CNS Control Room Unfiltered Inleakage Testing Program Accomplished intent of NRC Initiative with respect to Control Room Habitability Conservatively quantified Unfiltered Inleakage to support Dose Analysis Identified Design, Construction, and Maintenance Weaknesses Implemented Corrective Actions to address weaknesses Action items: Person responsible: Deadline:

2:25-2:45 PM Alternative Issue Resolution - Jim Kammer Discussion:

Option 2 Modify CR Ventilation system configuration and Perform 2nd Tracer Gas Test (If necessary)

Objectives Minimal Ductwork Disassembly Significant Test Accuracy Improvement Test Planning Review 1st Tracer Gas Test Results with Test Vendor Perform 2nd system walkdown with Test Vendor Develop new Test Protocol Test Plan Blank off CRA-PFT Flow to CRA Perform 2nd Tracer Gas Test Test Schedule 10/10102 VA/VE LAR CNS PORC 10/28/02 Install "A" Train Blank 11/4/02 Install "B" Train Blank 11/11/02 Perform Tracer Gas Test 11/18/02 Remove "A" Train Blank 11/20/02 Submit VANVE LAR to NRC (Latest Date) 12/6102 Remove "B" Train Blank 1/30/03 Transmit Tracer Gas Test Results to NRC (Latest Date) 5/13/03 NRC Issue VANVE LAR 5/13/03 Install VC Plant Modification

Conclusions:

Action items: Person responsible: Deadline:

a -

2:45-3:00 PM Summary and Conclusions Discussion:

CNS Control Room Ventilation System could be modified to allow a "typical" Tracer Gas Testing Configuration' Significant expense and dedication of manpower to performing a second tracer gas test:

Procedure development Engineering resources Station resources Vendor Costs Limited Control Room access during test Operator discomfort Significant change management as well as dedication of manpower and resources is required to implement such a modification. Major impacts include:

Design Review and Reanalysis of Control Room Ventilation System Hardware Changes to Ductwork and Control Room Instrumentation Configuration Management Changes (Calculations, Drawings, Specifications, etc.)

Technical Specification Changes Operation, Surveillance, and Maintenance Procedure Changes Retraining of station personnel on System Design, Configuration and Operation Miscellaneous Impacts of such a change Anticipate larger swings in control room pressure (potential Operator discomfort)

Zero operating experience with new system configuration Historical trending of system performance no longer applicable Benefit Discussion The modification provides no obvious benefit to system performance The modification providestwobvious improvement in Nuclear Safety Control Room Operator Health and Safety Public Health and Safety

Conclusions:

Action items: Person responsible: Deadline:

3:00-3:25 PM Genreral Discussion' Discussion:

==

Conclusions:==

Action items: Person responsible: Deadline: