ML12026A459

Seabrook EDG Ifr

ML12026A459
Person / Time
Site:	Seabrook
Issue date:	01/26/2012
From:	Wolfgang R J Component Performance and Testing Branch
To:
Wolfgang R J, NRR/DE/EPTB, 415-1624
References
Download: ML12026A459 (14)

Text

EDG ActivitiesBobWolfgang Bob WolfgangDivision of EngineeringComponent Performance and Testing Branch NOT NRC POLICY OR POSITION

• Reg.GuidebeingrevisedbyOfficeof Regulatory Guide 1.137, "Fuel Oil Systems for Emergency Power Supplies"Reg. Guide being revised by Office of New Reactors*Adding gas turbine generators

• Adding information on ULSD

• Adding information on biodiesel

• Updating referenced standards Preliminary OpE Insights for 2011*Increase in EDG issues related to inadequate bolt torquing 3

• The Standard Technical Specifications contain Surveillance Requirements that

verif y diesel generator volta g e and Voltage and Frequency yg gfrequency. Specifically, SR 3.8.1.7 has the following:-Frequency is allowed to vary +

2% *58.8 Hz -61.2 Hz-Voltage is allowed to vary up to +10% (rounded to the nearest 10 volts)*3740 V -4580 V (for a 4160 V system)

• Account for the capability of the control systems, i.e., governor and voltage

regulator to control around those nominal PWROG Proposal values.*Treat the tolerance as an uncertainty, similar to an instrument setpoint, and

perform an uncertainty calculation which

considers the specified tolerance, measurement and test instrument uncertainties, and setting tolerances.

PWROG ProposalChanges to IST Requirements to Address DG Voltage/Frequency VariationsOriginal MaximumAllowable Pump HeadAdjusted MaximumAllowable Pump HeadPump FlowPump HeadOriginal Minimum Allowable Pump HeadAdjusted MinimumAllowable Pump Head

• Establish basis for minimum and maximum acceptable voltage*Ensure valve stroke time and torque are Issues acceptable*Ensure pumps can start, run and have adequate capability (Safety Analyses)*Loads that are not di sconnected continue to operate after voltage drop during large motor

start

• Relocatestoredfueloil andlubeoilTechnical Specification Task Force TSTF 501 Relocate stored fuel oil and lube oil volume values to licensee control*Minor changes in volume requirements (e.g. ULSD) without

NRC approval

• The NRC SBO rule (10 CFR 50.63) requires that each nuclear power plant must be abl e to cool the reactor core and maintain containment integrity for a specified duration of SBO*RG1155"StationBlackout "describesanacceptable SBO Background

• RG 1.155 , Station Blackout , describes an acceptable means to comply with 10 CFR 50.63*The method described in RG 1.155 results in a minimum acceptable SBO duration capability ranging from 2 to 16 hour1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />s*The result for all operating pl ants was a coping duration of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> max. ( Refer NUMARC 87-00)*EDG Reliability was a factor to attain 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> coping duration

• Recommendation 4*The Task Force recommends that CSO Fukushima Actions the NR C strengthen S B O mitigation capability at all operating and new reactors for design-basis and beyond-design-basis external events

• Initiate rulemaking to revise 10 CFR 50.63 to require each operating and new reactor licensee to:

(1) establish a minimum co p in g time of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> for a Task Force Recommendations

()pgloss of all ac powe r-may entail small AC source (2) establish the equipment, procedures, and training necessary to implement an "extended loss of all AC" coping time of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for core and spent fuel pool cooling and for reactor coolant system and primary containment integrity as needed (3) preplan and pre-stage offsite resources to support uninterrupted core and spent fuel pool cooling

• LCO 3.8.1 requires: -b. Two diesel generators capable of supplyingtheonsiteClass1Epower License Amendment RequestsFor Allowed Outage Time supplying the onsite Class 1E power distribution subsystem(s)-ACTION: Restore DG to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> *Staff extending the LCO to maximum 14 days with compensatory actions and AAC power source*Need PRA and deterministic submittal Temporary Instruction 2515/176, "Emergency Diesel Generator Technical Specification

Surveillance Requirements Regarding EnduranceandMarginTesting "EDG Testing Survey Endurance and Margin Testing (ML080420064)*Staff Evaluating:

1) Consistency in testing requirements

2) Test Load to envelope postulated accident load 3) R.G. 1.9 allows 90% of continuous rating Qti Q ues ti ons 14