ML17056C091
| ML17056C091 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 10/26/1992 |
| From: | Menning J Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TAC-M84197, NUDOCS 9210290183 | |
| Download: ML17056C091 (62) | |
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~O 4***4 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, O. C. 20555 October 26, 1992 Docket No. 50-410 LICENSEE:
Niagara Mohawk Power Corporation FACILITY:
Nine Mile Point Nuclear Station Unit 2
SUBJECT:
SUMMARY
OF OCTOBER 22,
- 1992, MEETING TO DISCUSS FINAL RESOLUTION OF THE SECONDARY CONTAINMENT DRAWDOWN ISSUE (TAC NO. M84197)
A meeting was held in the NRC One White Flint North Office in Rockville, Maryland, with Niagara Mohawk Power Corporation (NMPC) and NRC staff representatives to discuss final resolution of the secondary containment drawdown issue.
By letter dated June 1,
- 1992, NMPC provided the NRC staff with the analysis and design concepts for plant modifications required to support final resolution of the secondary containment drawdown issue.
The NMPC letter requested a meeting with the NRC to discuss these analysis and design concepts, related technical specification (TS) changes, and the manner in which plant modifications would likely be implemented.
The subject meeting was held in response to this NMPC request.
Enclosure 1 is a list of meeting attendees.
Enclosure 2 is a copy of the handout material provided by NMPC.
The NMPC representatives initially reviewed the history of the secondary containment drawdown issue at Unit 2.
NMPC has imposed certain compensatory measures to ensure that the radiological consequences of a design basis Loss of Coolant Accident remain within 10 CFR Part 100 guideline values and consistent with General Design Criterion 19.
These measures have included both modifications and the imposition of administrative controls to ensure that an adequate differential temperature is maintained between air in the secondary containment and the service water pump discharge.
Deliberate heating of the reactor building has been required in the summer months in order to maintain an adequate differential temperature.
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PDR POOCH, 05000 P
J Subsequent discussions concerned modifications that NMPC plans to implement during Refueling Outage 3 (R03) to obviate the need for the previously mentioned administrative controls.
Specifically, NMPC has determined that the original Standby Gas Treatment System (SGTS) capacity needs to be increased by approximately 100 percent.
NMPC plans to increase the exhaust capacity of each SGTS train from 4000 cfm to 8000 cfm and install new filter trains.
Each train will be provided with a two-speed fan, with a high-speed capacity of 8000 cfm and a low-speed capacity of 4000 cfm.
Under accident conditions both fans would start at high speed.
One fan would subsequently trip when a
negative differential pressure of 0.25 inch water gauge is reestablished in the secondary containment and the other fan would continue to run.
The operating fan would shift from fast to slow speed when flow decreases to 3700 cfm.
The new SGTS trains would be equipped with inlet variable vane dampers for flow rate control and would not have recirculation lines for the control of flow.
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Niagara Hohawk Power Corporation The current plant design utilizes a 14-inch bypass line around each SGTS train for emergency primary containment venting.
Personnel must now manually remove expansion joints and install blind flanges to bypass a
SGTS filtration unit in preparation for emergency primary containment venting.
As part of the SGTS modification, the design for emergency venting will be revised to eliminate the need to perform these manual operations.
The new design will utilize a remotely operated valve within a single line that bypasses both SGTS filter trains in place of the existing individual bypass lines.
During the discussion of these design changes the NRC staff suggested that NHPC carefully evaluate the potential for leakage through this line that could bypass the filter trains during SGTS operation.
The remaining discussions concerned TS changes that NHPC plans to request prior to implementation of the SGTS modifications.
Technical specification changes will clearly be required to accommodate the new SGTS design.
NHPC will also request TS changes to facilitate installation of the new SGTS trains.
NHPC has determined that the length of R03 could be reduced by approximately 2 weeks if the'ore could be unloaded and reloaded with only one operable SGTS train.
Limiting Condition for Operation (LCO) 3.6.5.3 of. the current TS allows refueling operations to continue for 7 days if one only SGTS train is operable.
NHPC estimates that core unload and reload will each take about 8 days.
Consequently, NHPC plans to request a change to LCO 3.6.5.3 that is consistent NUREG-1434, "Standard Technical Specifications - General Electric Plants, BWR/6."
Specifically, NHPC will request that the LCO be changed to allow refueling operations with only one operable SGTS train if the operable train is running.
Refueling operations would be suspended if the operating train stops.
During the discussion of these changes to the TS the NRC staff recommended that NHPC's safety evaluation address continuous SGTS operation with concurrent operation of the normal reactor building ventilation system.
The NHPC representatives indicated that the TS change requests would be submitted by December 31,
- 1992, and that they would request that related license amendments be issued by June 30, 1992.
Although R03 is currently scheduled
.to start in September 1993 NHPC would like to have the amendments issued sooner in case the outage start date is advanced.
NHPC further stated that different effective dates will be requested for the TS change requests.
Specifically, NHPC will request that the changes to facilitate installation be effective prior to the start of the refueling outage.
NHPC will request that the TS changes to accommodate the new SGTS design be effective after core offload.
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Niagara Mohawk Power Corporation 3-At the conclusion of the meeting the NRC staff noted that the discussions had been very useful in providing the staff with updated information on the SGTS and emergency primary containment venting modifications, related TS changes, and NHPC's current schedule for submittals.
Enclosures:
1.
List of Attendees 2.
Licensee Handout Material John E. Henning, Project Manager Project Directorate I-1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation cc w/enclosures:
See next page
Niagara Hohawk Power Corporation Nine Mile Point Nuclear Station Unit No.
2 CC:
Hark J. Wetterhahn, Esquire Winston 3 Strawn 1400 L Street, NW.
Washington, DC 20005-3502 Hr. Richard Goldsmith Syracuse University College of Law E. I. White Hall Campus
- Syracuse, New York 12223 Resident Inspector Nine Mile Point Nuclear Station P. 0.
Box 126
- Lycoming, New York 13093 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202 Hr. David K. Greene Manager Licensing Niagara Mohawk Power Corporation 301 Plainfield Road
- Syracuse, New York 13212 Hs.
Donna Ross New York State Energy Office 2 Empire State Plaza 16th Floor
- Albany, New York 12223 Supervisor Town of Scriba Route 8, Box 382
- Oswego, New York 13126 Regional Administrator, Region I
U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, New York 10271 Hr. Richard H. Kessel Chair and Executive Director State Consumer Protection Board 99 Washington Avenue
- Albany, New York 12210 Hr. Hartin J.
HcCormick Jr.
Plant Manager, Unit 2 Nine Nile Point Nuclear Station Niagara Mohawk Power Corporation P. 0.
Box 32
- Lycoming, New York 13093 Hr. Neil S.
Cams Vice President - Nuclear Generation Nine Mile Point Nuclear Station Niagara Mohawk Power Corporation P. 0.
Box 32
- Lycoming, New York 13093 Hr.
B. Ralph Sylvia Executive Vice President, Nuclear Niagara Mohawk Power Corporation 301 Plainfield Road
- Syracuse, New York 13212
ENCLOSURE 1
ATTENDANCE LIST October 22,
- 1992, Meeting to Discuss Final Resolution of the Nine Mile Point Unit 2 Secondary Containment Drawdown Issue Name Robert A. Capra John E. Henning Mark D. Pratt Jack Hayes Calvin Hoon Jack Kudrick Thomas D.
Fay John T.
Conway Ken Korcz W. David Baker Ed Klein Hark Wetterhahn Tom O'Reilly Ed Lind Steve Tsombaris Mark Lombard Position Project Director Project Manager Electrical Engineer Health Physicist Sr. Reactor Engineer Section Chief Licensing Engineer Tech.
Support Mgr.
Licensing Engineer Program Director Project Manager Attorney Mechanical Engineer Mechanical Engineer Electrical Engineer Vice President Or anization NRC/NRR/PD I-1 NRC/NRR/PD I-1 NRC/NRR/SELB NRC/NRR/PRPB NRC/NRR/OTSB NRC/NRR/SCSB Niagara Mohawk Niagara Mohawk Niagara Mohawk Niagara Mohawk Niagara Mohawk Winston 5 Strawn Halliburton-NUS Stone 8 Webster Stone 5 Webster HDH Engineering
ENCLOSURE 2 NIAGARA MOHAWKPOWER CORPORATION NINE MlLE POINT UNIT 2
iconda ry,.:,;':C on"t ainm an': D'raw'id'o'viii:.
October 22, 1992
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PURPOSE
~
DISCUSS SGTS DESIGN RESOLUTION FOR THE DRAWDOWN ISSUE DISCUSS CONSTRUCTION SCHEDULE
~
DISCUSS PROPOSED TECHNICALSPECIFICATION CHANGES LONG-TERM OPERATION INSTALLATION OBTAIN NRC INPUT WITH REGARD TO DESIGN, INSTALLATION,DRAWDOWN ANALYSIS,AND TECHNICALSPECIFICATION CHANGES ASSOCIATED WlTH THE NEW SGTS (PAGE 2 OF 24)
I
BACKGROUND E. R. KLEIN PROBLEM RESOLUTION E. R. KLAN.
CONSTRUCTION PLANS SCHEDULE SURVEILLANCETESTING E. R. KLEIN PROPOSED TECHNICALSPECIFICATION CHANGES K. W. KORCZ INSTALLATION PERMANENT (PAGE 3 OF 24)
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- ,.--"':,""'OVERVIEW'F.DRAWDOWN.lSSUES':
BACK R ND:
~
ORIGINALANALYSISASSUMED SECONDARY CONTAINMENT(S.C.)
TEMPERATURE OF 104 F AT START OF LOCA EVENT
~
DESIGN TEMPERATURE OF S.C. AT START OF LOCA EVENT IS 85 F
~
THEREFORE, UNIT COOLERS WOULD HAVE A SMALL6T AT START OF LOCA EVENT
~
AT PRESENT TIME, A MINIMUMDIFFERENTIALTEMPERATURE OF APPROXIMATELY224F IS MAINTAINEDBETWEEN S.C. AIR TEMPERATURE AND SERVICE WATER TEMPERATURE (PAGE 4 OF 24)
'OVERVIENl'.OF DRAWDOWN'SSUES PERMANENT RE L Tl N:
~
INCREASE EXHAUST CAPACITY OF THE SGTS FROM 4000 CFM TO 8000 CFM
~
NEW FILTER TRAINS ARE ALSO REQUIRED
~
SELECTED UNIT COOLERS ARE STILL REQUIRED TO MEET DRAWDOWN TIME (SEE TABLE 1)
~
TWO-SPEED FANS ARE PROVIDED:
HIGH SPEED CAPACITY IS 8000 CFM - LOW SPEED CAPACITY IS 4000 CFM
~'OTH FANS START AT HIGH SPEED
~'AG FAN TRIPS WHEN -0.25 IN W.G. IS ESTABLISHED IN S.C. - LEAD FAN CONTINUES TO RUN
~
VARIABLEVANE DAMPER WILLGRADUALLYCLOSE (DECREASING FLOW RATE) AS NEGATIVE PRESSURE INCREASES IN S.C.
~
ANALYSIS ASSUMES INLEAKAGETO BE 2850 CFM AT ANY OUTSIDE TEMPERATURE (CONSE RVATIVEASSUMPTION)
~
LEAD FAN TRIPS TO LOW SPEED WHEN 3700 CFM IS MEASURED AT FLOW ELEMENT (PAGE 5 OF 24)
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UNlT COOLER 2HVR'UC LOCATlON Division Division I
II III I II III Existing Desig New Oesign 401A RHR Pump Room A 401B RHR Pump Room C 401C RHR Pump Room B 401D RHR Pump Room A 401K RHR Pump Room C 401F RHR Pump Room B 402A LPCS Pump Room 402B LPCS Pump Room 403A HPCS Pump Room 403B HPCS Pump Room 404A General Area, El.
175'04B General Area, El.
175'04C General Area, El.
175'04D General Area, El.
175'05-RHR Hx Room A 406-RHR Hx Room B 40VA General Area, El.
215'0VB General Area, El.
215'0VC General Area, El.
215'0VD General Area, El. 215'.
40VE General Area, El.
215'10A General Area, El.
240'10B General Area, El.
240'10C General Area, El.
240'11A General Area, El.
261'11B General Area, El.
261'11C General Area, El.
261'12A RCIC Pump Room 4128 RCIC Pump Room 413A Recirc. Unit Cooler 413B Recirc. Unit Cooler 414A General Area, El.
261'14B General Area, El.
261'otal
'X 15 16 2
5 5
1 (PAGE 6 OF 24)
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Ql Filter Train Q4 Variable Position Inlet Vanes Q2 Fan (Blower)
QS Damper Operator Q3 2 Speed Fan Motor Q6 Expansion Joint MODIFlCATlON COOLING UNITS To Stack "le g
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MODIFICATION Ql Filter Train Q4 Variable Position Inlet Vanes Q2 Fan (Blower)
QS Damper Operator 2 Speed Fan Motor Expansion Jcint
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=.',.-",SURVElLLANCE".TEST.'.TO'-,VERlFY FAN-'PERFORtvtANCE'".. '.
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THE TIME TO ESTABLISH - 0.25 IN W.G. IN S.C. WITH VARYING INLEAKAGE IS CALCULATED
~
A CURVE SHOWING DRAWDOWN TIME FOR VARIOUS CORRECTED INLEAKAGES IS DEVELOPED (SEE FIGURE 1)
~
INLEAKAGEHAS TO BE DETERMINED DURING SURVEILLANCETEST
~
MEASURED INLEAKAGEMUST BE CORRECTED FOR AIR TEMPERATURE AND PRESSURE
~'ORRECTION FACTORS F, AND F~ ARE DETERMINED FOR PRESSURE AND TEMPERATURE
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CORRECTED INLEAKAGEIS' CORRECTED
=
Q MEASURED x F, x F, (PAGE 10 OF 24)
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39.0 FIGURE 1
iiiHP2 DRAWDOWNTEST VRAiNLATIONCURVES Drawdown Time vs corrected inleakage Qow 38.5 38.0 37.5
'g 370 p
0~ 36.5 Cl 36.0 35.5 35.0 34.5 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 Corrected Inleakage Flow (acfm)
(PAGE 11 OF 24)
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1.00 Ni)IP2 BRAWBOiYNTEST TRANSLATIONCURVES Correction factor for inleakage 0.25" wg Bounding Curves 0.95 0.90 g
0.85 0 0.80 0
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> 075 out=0'F out=20'F out=40'F 0.70 out=60'F 0.65 out=85'F 0.60 0.25 0.30 0.50 0
5 0.35 0.40 0.45
.5 Differential Pressure During Surveillance Test (in wg) 0.60 (PAGE 12 OF 24)
1.05 FIGURE 3 iIIiHP2 MAWDOIVNTEST TBANSLATIOiitCURVES Correction factor for Qow meter reading to inleakage flowBounding Curves 1.00 sw=5 5oF sw=45'F sw=85'F
> 095 0
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sw=33'F sw=65F 0.85 0.80 0
10 20 30 40 50 60 70 80 90 Outside Temperature During SOTS Surveillance Test ('F)
(PAGE 13 OF 2a)
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FIGURE 4 2800 Ni)IP2 DBAWDOWiifTEST TRANSLATION CURVES Allowable inleakage vs outside temperature 2700 8
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10 20 30 40 50 60 70 80 Outside Temperature During SGTS Surveillance Test ('F) 90 (PAGE 14 OF 24)
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Restart Activities 22 days Shutdown Unload 8 days S days No Fuel Movement Reload 8 days r/rrrrrrrrrrrr'rrr/rrrrrrr/r'rrr'rr/rrrr//'i/r'r/r//r/rrr//i////r/r/////i/irrr'r/riirr//r/r//r//r///"
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16 days 14 days 30 days PROPOSED REFUELING OUTAGE ain A - 30 days Install &Test Tr Install &Test Train 8 - 30 days 46 days
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INSTALLATIONOF NE% SGTS
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TECHNICAL SPECIFICATION CHANGES-PURP E:
~
INCORPORATE EFFECT OF NEW SGTS DESIGN, SGTS OPERATION AND DRAWDOWN ANALYSIS ON SGTS AND SECONDARY CONTAINMENT INTEGRITY SURVEILLANCES
~
ALLOWREFUELING ACTIVITIES CONCURRENT WITH INSTALLATIONOF SGTS (PAGE 17 OF 24)
~
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TECHNICAL: SPECIFICATION: CHANGE'TO': FACILITATEINSTALLATION AND
- PROVIDE OPERATIONAL'LEXIBILITY NUREG-1434, IMPROVED STS FOR BWR'S, CONTAINS OPERATIONAL FLEXIBILITYFOR FUEL HANDLINGOPERATIONS.
NMPC INTENDS TO ADOPT THESE PROVISIONS
~
CHANGE TO LCO 3.6.5.3, "SGTS"
- ALLOWS REFUELING ACTIVITIESWITH 1 SGTS TRAIN INOPERABLE PROVIDED OTHER TRAIN IS RUNNING
- RUNNING TRAIN CAN BE EITHER OLD SGTS DESIGN OR NEW SGTS DESIGN
- IF RUNNING TRAIN STOPS, SUSPEND REFUELING ACTIVITIES (PAGE 18 OF 24)
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TECHNICAL SPECIFICATION CHANGES AFFECTED BY-NEW SGTS DESIGN, SGTS OPERATION-AND DRAWDOWN ANALYSIS '
AFFECTED TECHNICALSPECIFICATION SURVEILLANCES:
4.6.5.1, SECONDARY CONTAINMENTINTEGRITY 4.6.6.3, STANDBY GAS TREATMENT (PAGE 19 OF 24)
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URVEILLAN E 4...1 E
NDARY NTAINMENTINTE RITY:
~
4.6.5.1.C.2, IVlAXIMUMSECONDARY CONTAINMENTINLEAKAGE EXISTING ACCEPTANCE CRITERION
~
3190 CFM NEW ACCEPTANCE CRITERION
~
< THE CALCULATEDALLOWABLEINLEAKAGEDETERMINED FROM OUTSIDE AND INSIDE AIR TEMPERATURE
~
NOT TO EXCEED 2850 CFM AT -20~F OUTSIDE AIR TEMPERATURE
~
2850 CFM
=
100% OF S.C. AIR VOLUME/DAY
~
4.6.5.1.C.1, DRAWDOWN TIME:
EXISTING ACCEPTANCE CRITERION
~
120 SECONDS NEW ACCEPTANCE CRITERION
~ ( THE CALCULATEDALLOWABLETIME DETERMINED FROlVI THE SECONDARY CONTAINMENTCORRECTED SURVEILLANCETEST INLEAKAGEVALUE, THE SECONDARY CONTAINMENTNET VOLUME AND A FAN CAPACITY OF ) 7500 CFM
~
NOT TO EXCEED 38.6 SECONDS AT 2850 CFM k
~
ASSOCIATED BASES CHANGES (PAGE 20 OF 24)
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4.6.5.3.b.1, SUBSYSTEM FLOW RATE ASSOCIATED WITH IN-PLACE PENETRATION AND BYPASS LEAKAGETESTING ACCEPTANCE CRITERION
~
EXISTING -4000 CFM + 10%
~
NEW - 8000 CFIVI + 10%
4.6.5.3.b.3, SUBSYSTEM FLOW RATE WHEN TESTED IN ACCORDANCE WITH ANSI N510-1980 ACCEPTANCE CRITERION
~
EXISTING - 4000 CFM + '10%
~
NEW - 8000 CFM + 10% AND 4000 CFM + 10%
~
4.6.5.3.d.1, MEASURING PRESSURE DROP ACROSS COIVIBINED HEPA FILTERS AND CHARCOAL ADSORBER BANKS WHILE OPERATING AT A SPECIFIED FLOW RATE ACCEPTANCE CRITERION
~
EXISTING - LESS THAN 5.5 INCHES WATER GAUGE AT 4000 CFM + 10%
~
NEW - LESS THAN 7.5 INCHES WATER GAUGE AT 8000 CFM + 10%
~
4.6.5.3.d 4, POWER OUTPUT OF HEATERS WHEN TESTED IN ACCORDANCE WITH ANSI N510-1980 ACCEPTANCE CRITERION
~
EXISTING - 20.0 ~ 2 KW
~
NEW-60.0 + 2.5 KW (PAGE 21 OF 24)
1
SURVEILLAN E 4...
GTS n'
4.6.5.3.e, REPERFORMING OF IN-PLACE PENETRATION AND BYPASS LEAKAGE TESTING AFTER COMPLETE OR PARTIAL REPLACEMENT OF HEPA FILTER BANK WITH A GIVEN SPECIFIED FLOW ACCEPTANCE CRITERION
~
EXISTING - 4000 CFM + 10%
~
NEW - 8000 CFM + 10%
~
4.6.5.3.f, REPERFORIVIING OF IN-PLACE PENETRATION AND BYPASS LEAKAGE TESTING AFTER COMPLETE OR PARTIAL REPLACEMENT OF CHARCOAL ADSORBER BANKWITH A GIVEN SPECIFIED FLOW ACCEPTANCE CRITERION
~
EXISTING - 4000 CFM ~ 10%
~
NEW - 8000 CFM + 10%
(PAGE 22 OF 24)
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'ENTATlVE'ROPOSED NEW SURVE1L't ANCES' 4.6.5.1.c.1, DRAWDOWN TIME (PARTIALLYNEW)
VERIFY EACH TRAIN STARTS AT HIGH SPEED CALIBRATIONOF 3700 CFM SETPOINT, OPERATING TRAIN DOWNSPEED SHIFT
~
NEED FOR ABOVE SURVEILLANCES AND ANY ADDITIONALSURVEILLANCES WILLBE RE-EVALUATEDAFTER COMPLETION OF FAILURE MODES AND EFFECTS ANALYSIS (FMEA)
(PAGE 23 OF 24)
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LICENSING SCHEDULE
~
TECHNICALSPECIFICATION SUBMITTALS BY 12/31/92 NEW SGTS DESIGN FACILITATEINSTALLATIONAND OPERATIONAL FLEXIBILITY
~
REQUEST ISSUANCE OF LICENSE AMENDMENTS BY 6/30/93
~
THIRD REFUELING OUTAGE COMMENCES SEPTEMBER 1993
~
REQUEST DIFFERENT EFFECTIVE DATES FOR BOTH LICENSE AMENDMENTS OPERATIONAL FLEXIBILITYLICENSE AMENDMENTEFFECTIVE PRIOR TO COMMENCEMENT OF REFUELING OUTAGE NEW SGTS LICENSE AMENDMENTEFFECTIVE AFTER CORE OFFLOAD (PAGE 24 OF 24)
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Niagara Mohawk Power Corporation October 26, 1992 At the conclusion of the meeting the NRC staff noted that the discussions had been very useful in providing the staff with updated information on the SGTS and emergency primary containment venting modifications, related TS changes, and NHPC's current schedule, for submittals.
Original signed by:
Enclosures:
1.
List of Attendees 2.
Licensee Handout Material cc w/enclosures:
See next page John E. Henning, Project Manager Project Directorate I-1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation Distribution Docket File NRC
& Local PDRs PDI-1 Reading THurley/FHir agl i a, 12/G/18
- JPartlow, 12/G/18 SVarga JCalvo RACapra JHenning CVogan OGC
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- JHayes, 10/D/4 JKudrick, 8/D/1 CHoon, ll/E/22
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- VHcCree, 17/G/21 CCowgill PDI-1'A CVo an Io @/92 PDI-1 PH JHennin "
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