ML21133A421
| ML21133A421 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 05/13/2021 |
| From: | Mark D. Sartain Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 21-156 | |
| Download: ML21133A421 (6) | |
Text
VIRGINIAELECTRIC ANDPOWERCOMPANY RICHMOND,VIRGINIA 23261 May13,2021 10CFR50.90 p
U.S.Nuclear Regulatory Commission Serial No.: 21-156 Attention:
DocumentControl Desk NRA/GDM:R1 E
Washington, DC20555-0001 Docket Nos.:
50-280 50-281 License Nos.:
DPR-32 DPR-37 i
i I
IEBM.DOSLANALY.Sis I
r Byletter datedDecember 3,2020(Serial No.20381),Virginia ElectricandPower i
Company(Dominion Energy Virginia) requested amendments to Surry PowerStation (Surry)
Units1 and2 Facility Operating License NumbersDPR-32 andDPR-37, I
respectively.
The proposed License AmendmentRequest(LAR)
(Agencywide Documents AccessandManagement System(ADAMS)
Accession No.
ML20338A542) updates theAlternate Source Term(AST) analysis forSurry Units 1 and 2 following a
LossofCoolant Accident (LOCA).
Specifically, theLOCAdose consequence analysis hasbeenrevised toincrease theassumedcontainment depressurization profile and to reduce theRefueling WaterStorage Tankbackleakage limit.
During their review oftheproposed LAR,theNRCstaff identified theneedfor additional information tocomplete their review.
Specifically, theNRCrequested a discussion of I
whether theproposed changehadanyimpact ontheenvironmental qualification of electrical equipment incontainment subject totherequirements of10CFR50.49.
1 Dominion Energy Virginia's response totherequest foradditional information (RAI) is j
provided intheattachment.
l Thenosignificant hazards consideration determination andtheenvironmental evaluation provided intheLARarenotaffected bytheRAlresponse.
i iI
Serial No.21-156 Docket Nos.50-280/281 Page2of3 Should you haveanyquestions orrequire additional information, please contact GaryD.
Millerat (804) 273-2771.
Respectfully, D
MarkD.Sartain VicePresident
- NuclearEngineering andFleet Support Commitments contained inthisletter:
None
Attachment:
Response
toNRCRequest forAdditional information, LossofCoolant Accident (LOCA)
Updated Alternate SourceTermDoseAnalysis COMMONWEALTH OFVIRGINIA
))
COUNTYOFHENRICO
)
Theforegoing document wasacknowledged before me,inand for theCountyandCommonwealth aforesaid, todaybyMr.MarkD.Sartain, whoisVicePresident Nuclear Engineering andFleet
- Support, ofVirginia Electric andPowerCompany.He hasaffirmed before me thatheisduly authorized toexecuteandfile theforegoing documentinbehalf ofthat
- company, andthatthe statements inthedocument aretruetothebestofhisknowledge andbelief.
Acknowledged before methis/3 dayof
, 2021.
MyCommission Expires:
U 2o21 A
GARYDONMILLER No yPublic Notary Public Comrnonwealth ofVirginia Reg.#7629412 MyCommission Expires August 31,20E3-
Serial No.21-156 Docket Nos.50-280/281 Page3of3 cc: U.S.
Nuclear Regulatory Commission
- Region II Marquis OneTower 245 Peachtree Center Avenue,NESuite 1200
- Atlanta, GA 30303-1257 State Health Commissioner Virginia Department ofHealth JamesMadison Building
- 7thfloor 109Governor
- Street, Suite 730
- Richmond, VA23219 Mr.VaughnThomas NRCProject Manager
- Surry U.S.Nuclear Regulatory Commission OneWhiteFlint North MailStop04F-1211555Rockville Pike Rockville, MD20852-2738 Mr.G.EdwardMiller NRCSenior Project Manager
- North Anna U.S.Nuclear Regulatory Commission OneWhite Flint North MailStop09E-311555Rockville Pike Rockville, MD20852-2738 NRCSenior Resident Inspector Surry PowerStation
Serial No.21-156 Docket Nos.50-280/281 Attachment
RESPONSE
TONRCREQUEST FORADDITIONAL INFORMATION DOSEANALYSIS LICENSE AMENDMENT REQUEST I
I I
i I
Virginia Electric andPowerCompany (Dominion EnergyVirginia)
SurryPowerStation Units1and2
Serial No.21-156 Docket Nos.50-280/281 Attachment Back.groun.st Byletter dated December 3, 2020 (Serial No.20-381),
Virginia Electric andPower Company(Dominion EnergyVirginia) requested amendments toSurry PowerStation (Surry)
Units 1 and2 Facility Operating License NumbersDPR-32andDPR-37, respectively.
The proposed License Amendment Request(LAR)
(Agencywide Documents Access andManagement System (ADAMS) Accession No.ML20338A542) updates theAlternate Source Term(AST) analysis forSurry Units 1and2following a
LossofCoolant Accident (LOCA).
Specifically, theLOCAdoseconsequence analysis hasbeenrevised toincrease theassumedcontainment depressurization profile andto reduce theRefueling WaterStorage Tankbackleakage limit.
Subsequent tothesubmittal oftheproposed LAR,the NRC staff requested additional information tocomplete their review.
TheNRC'srequest andDominion Energy Virginia's response areprovided below.
N.R.C Regges)
InSection 2,"Proposed Licensing BasisChanges,"
ofthelicenseamendment request (LAR),
thelicensee stated:
Theproposed changes fora LOCAradiological eventare:1)an increase ofthe containment depressurization
- profile, and2)a reduction oftheRWSTback leakage limit.
Fudhermore, inSection 2.1,"Increased Containment Depressurization Profile,"
ofthe LAR,thelicensee stated:
Thecurrent licensing basis states thatthecontainment will depressurize to1.0psig within 1hourandless than0.0psig within 4hours.
Theproposed change wouldrequire thecontainment todepressurize to2.0psig within 1hourandlessthan0.0psig within 6
hours.
Thischange will bereflected intheLOCAdoseconsequence analysis through anincreased containment leak rateaspresented inTable 2-1andSection 3.5.1.
Theproposed amendment wouldincrease thecontainment depressurization profile as described insection 2.1.However, theproposed LARdoesnotdiscuss theimpact to theenvironmental qualification ofelectrical equipment subject totherequirements of Page1of2
Serial No.21-156 Docket Nos.50-280/281 Attachment 10CFR 50.49.
Therefore,theNRCstaff requests thelicensee todiscuss theimpact of the proposed change ontheenvironmental qualification ofelectrical equipment.
M Asdescribed inthe proposed LAR,Dominion Energy Virginia hasrequested achange tothecontainment depressurization profile that isusedasaninput totheLOCAdose consequence analysis.
The proposed bounding profile setsanewacceptance criterion forthesafety analyses containment pressureresponse.
Separate fromtheprofile used intheLOCAdoseconsequence
- analysis, Dominion Energymaintains a bounding containment pressure profile fortheEquipment Qualification (EQ) program.
Theproposed LARdoesnotchange orimpact theEQ containment pressure
- profile, which will continue toboundthesafety analyses containment pressure response.
As
- such, thecontainmentpressure response acceptance criterion fortheEQprogram will remain thesame.
t Thebounding containment pressure profilesused fortheLOCAdoseconsequence analysis andEQprogram areestablished independently fromoneanother.
Both profiles constitute acceptance criteria forthesafety analyses containment pressure response.
Themethods usedtogenerate eachprofileare governed byseparate rules and/or regulations, butinall cases,thecontainment safety analyses demonstrate that theprofiles arenotexceeded.
Asdescribed above,theEQcontainment pressure profile isunchanged andcontinues toboundthesafety analyses containment pressure response.
Therefore, theproposed LARhasnoimpact ontheEQprogram atSurry PowerStation.
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