ML062640277

Hearing - Entergy Exhibit 39, Table 1: VY Equipment Modifications Implemented for EPU Attached to Prefiled Testimony

ML062640277
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	09/13/2006
From:	Entergy Nuclear Operations, Entergy Nuclear Vermont Yankee
To:	Office of Nuclear Reactor Regulation
Byrdsong A T
References
50-271-OLA, Entergy-Licensee-39, RAS 12281
Download: ML062640277 (7)

Text

')OCKET NUMBER

-PROD. & UTIL FAC.Gp.

Table 1: VY Equipment Modifications Implemented for EPU Potential Post Mod Testing EPU Startup Testing Further Tested Impactn by Load Reject Modification Description Impacnt onWithout Bypass Response?

/ Main Steam Isolation Valve Closure Main turbine Replace 8' stage dia-No Vibration baseline Vibration monitoring NA

- LP dia-phragm of LP tur-measurements phragm

-bine replacement Main turbine Install higher capacity No In-service Leak Monitor temperature No cross-around relief valves check downstream of relief valves CARVs (CARVs) and Dis charge Pip ingI Main genera-Rewind/upgrade main No e Performance test M

Monitor generator 9 No tor -rewind generator for CPPU

• AC Hi-Pot test and cooling conditions, each phase Replace generator hy-o Pressure and vac drogen coolers with uum testing upgraded coolers o Winding resis tance

• Mengering Main con-Stake main con-No a Leak check tubes 9 Monitor chemistry

• No denser denser tubing to re-

• Monitor chemistry duce the effects of flow induced vibra tion Feedwater

• Replace relief valves No

• Bench test valves NA

• No heater 4A/B with larger capacity e Leak test installa shell side relief valve to ac-tion relief valve commodate in creased feedwater

~flow Steam dwrer e Replace lower cover No e Inspection Vibration and moist-No cover plate plates with thicker ture canyover moni strengthening plates toting during power

" Add reinforcing ascension per power stiffeners at lower ascension test plan cover plates and ver-(PATP) tical hood sides

" Removeinternal brackets in top in-2 side corners of outer I

hoods

• Replace vertical i

hood and hood top plates with thicker plates

• Replace/Upgrade tie bars Isolated e Install a new isolated No

• Monitor bus duct

• Performance mnri-No phase bus phase bus duct cool-cooling toting duct cooling ing system to re-e Flow tests move bus duct heat under CPPU condi tions_

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Potential Post Mod Testing EPU Startup Testing Further Tested Impact on by Load Reject Modification Description mato y edRjc Transient Without Bypass Response?

/ Main Steam Isolation Valve Closure HP feedwater

• #IA,#IB,#2A, and No

• Pressure test

• Perfonnancemoni-

• No heater re-

1. 2B feedwater

• Visual inspection toring placement heater replacement

• Magnetic particle testing

• Radiography e In-service inspec tion

• Thermal perform ance demonstra tion Residual heat

• Modify RHRSW No

• Visual Inspection NA

• No removal pumps (Train A and e Particle Testing service water B) Motor Bearing

• Ultrasonic Flow (RHRSW)

Oil Coolers piping to Testing system recover Service Wa-

• In-Service Inspec ter flow from the tion coolers NSSS/tonzs

• Upgrade particular No o Welds to be ex-NA

• No attached NSSS and toms at-amined by visual, piping tached piping sup-liquid penetrant, ports magnetic particle, as applicable Flow induced e Install FN instrm-No o Verify installation

• Collect EPU data

• No vibmtion mentation and analyze (FIV)

Reactor

• Provide rapid run-No

• Channel Calibra-NA

• No recirculation back of RR pump tion (RR) system from high power on

• Test with breakers runback trip of condensate or in "test" and RR feedwater pump system not operat ing Condensate

• Install condensate No

• Monitor chemistry

• With filtered bypass

• No demineralizer demineralizer fit-

• Establish flow in service, monitor tered bypass strainer baseline meas-flows under various to permit one urenents EPU conditions demineralizer to be

• Monitor reactor wa removed under ter chemistry CPPU conditions.

Feedwater o Protect feed pumps No

• Channel calibra-NA

• No system suc-(RFP) with two se-tion tion pressure quential levels of

• Test with breakers trip low suction pressure in "Test" position trips at various time delays to ensure only one pump trips at a time and for high power RR pump runback to '-60% on loss of. Feed Pump

• Modify trip logic to prevent common mode failure due to loss of RFP low flow circuits Cooling o Replace fan blades No

• Cooling tower NA

• No tower/fan with more efficient performance motors blades and drive mo-monitoring tors with upgraded higher performance motors 31

I Potential Post Mod Testing EPU Startup Testing Further Tested Modification Dscriptionon by Load Reject Transient Without Bypass Response?

I Main Steam Isolation Valve Closure EQ Upgrades

• Reroute feed to SRV No e Voltage check and NA

• No monitor to new megger breaker Grid Stability

• Increase the rating No

• Voltage checks

• In-service testing of

• No (million volt-ampere e Logic checks the 345kV and 115 (IVA)) of the Ver-a Relay calibration kV primary/ secon mont Yankee-dary protective relay, Northfield 345kV line canier system line from 896 MVA (Monthly) to a minimum rating of 1075 MVA e Increase MVA rating on the Ascutney Coolidge 115 kV line from 205 MVA to 240 MVA e Addition of 60 MVAr of shunt ca pacitors at the Ver mont Yankee 115 kV bus o Modification to pro vide a second pri mary protection scheme on the Ver mont Yankee north bus a Addition to provide a second primary protection scheme on the Vermont Yankee main gen erator

• Independent pole tripping on the Ver mont Yankee 381 breaker

• Addition of out of step protection for the Vermont Yankee generator Main turbine

• Replace HP Turbine No

• Factory 1201% trip

• Overspeed testing

• No

- HP flow steam path (new HP test

• Vibration monitoring path diaphragms and ro-Overspeed testing

• EPR and MPR Test tor)

• Control and stop ing per Power As o New control cams, valve response cension Test Plan camshafts and by-testing (PATP) draulics e Vibration baseline e Control and stop New control valve set-measurements valve testing tings

• EPR and MPR

" Modify control valve tuning operating mecha nism with 5% mar gin above CPPU

" Modify turbine con trol and overspeed se*point for CPPU conditions

• New Hydrogen Coolers 32

33

Further Potential Modeled in Post Mod Testing EPU Startup Tested by Modification Impact on Transient Testing Turbine Description Transient Analysis Trip I Main

Response

Steam iso lation Valve Closure Main steam line Respan trans-Yes Yes

• Channel calibra-

• TSre-m No high flow set-mitten to en-tion quired point compass new

• Test circuit logic channel 140% steam check and flow values calibration Replace the 4 transmitters used to pro vide 40% set point forMSL high flow re duced function with more ac curate trans mnitters Setpoint changes for 140% isolation at new steam flows a Install new in dicators an master trip units Neutron monitor-

• APRM flow Yes Yes a Channel calibra-T 7S re-

• No ing setpoints -

biased tion quired APRM and RBM SCRAM set-

• Test circuit logic channel points and rod check and block limits calibration require changes due CPPU

• APRMs re quire recali bration reflect ing CPPU rated power operation o RBMs require recalibration reflecting CPPU rated power opera tion Rod worth mini-

• Setpoint Yes Yes a Channe calibra-n TSre-

• No mizer (RWM) -

change to tion quired sctpoint maintain the

• Test circuit logic channel setpoint at the check and same absolute calibration value of steam flow due to the range changes of the associ ated instru ments Turbine first Setpoint Yes Yes

• Channel calibra-

• No. (TS

• No stage pressure changes for tion required the SCRAM

• Test circuit logic channel bypass check and calibration)

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34

4 Further Potential Modeled in Post Mod Testing EPU Startup Tested by Transient Testing Turbine Modification Description Impact on Trip I Main Transient Analysis STeam Iso ResponseSteam Iso

Response

iatton Valve Closure Feedwater Isold-

• Replace Sam-No No

• Leak Check 9 No a No netic Probes pie Probes process bound ary Feedwater Pump e Trip Feedwa-No No

• CincuitILogic

• Yes - Con-

• No Automatic Trip ter Pump on Tests densate Loss of Con-Pump Trip densate Pump Test 35