NL-20-1312, Response to Request for Additional Information Related to Proposed Inservice Inspection Alternative VEGP-ISI-ALT-04-04 Version 2.0

Response to Request for Additional Information Related to Proposed Inservice Inspection Alternative VEGP-ISI-ALT-04-04 Version 2.0

ML20329A302
Person / Time
Site:	Vogtle
Issue date:	11/23/2020
From:	Gayheart C Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-20-1312
Download: ML20329A302 (22)

Text

A Southern Nuclear November 23, 2020 Docket Nos.: 50-424 50-425 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Cheryl A. Gayheart Regulatory Affairs Director Vogtle Electric Generating Plant, Units 1 & 2 3535 Colonnade Park\\vay Birmingham, AL 35243 205 992 5316 cagayhea@southemco.com NL-20-1312 Response to Request for Additional Information Related to Proposed lnservice Inspection Alternative VEGP..-ISI-ALT-04-04 Version 2.0 Ladies and Gentlemen:

By letters dated December 11, 2019 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML193478105), and September 9, 2020 (ADAMS Accession No. ML20253A311 ), Southern Nuclear Operating Company (SNC) submitted a request for relief for the Vogtle Electric Generating Plant (VEGP), Units 1 and 2. SNC requests to increase the inspection interval for ASME Section XI, Table IWC-2500-1, exam Category CB, item number C2.21 and C2.22, exams from 10 years to 30 years through for the remainder of the 6th ISi Interval.

By email dated October 22, 2020, the US NRC notified SNC that additional information is needed for the staff to perform their review. to this letter provides the SNC response to the NRC request for additional information (RAI). Attachment 1 provides supplemental information regarding Item 2.c.i of the NRC Audit of the PROMISE Version 1.0 Software held on July 27, 2020.

This letter contains no NRC commitments. If you have any questions, please contact Jamie Coleman at 205.992.6611.

Cheryl A.

ay art Regulatory Affairs Director CAG/dsp/cbg

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to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020 2.c.i: Tee ical ec of O

E Versio 1.0 -

o abili yo De c ion POD) an lnservice Inspection (ISi) - t e EPRI Tee nic Basis Repor does ot disc ss e in er c io e

een he POD c rve a d ISi. S o hov POD n ISi a e i le ente into e

PRO SE Ver i n.0 code by sho i g e sof re requiren e s for th* f atu e and n n in some e a pie proble s.

ef r o Sec ions 8.2.2.3 n 8.2.2.8 of he EPR Tee nical Basis Re ort Op I e s:

I A. Provide the ra ionale for the se of the san1e POD c rve or bo ISi and PS.

B. Provide the r s I sofa PRO ISE run using a Ii 1 1ng case ith an ass mp io of 0% ISJ cover g.

Al-1 to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020

..., Response tb Open,:Audit-1tem 2.c.i.A (2 of 9)

" {

~.

~

~

. -=

• In Section 8.2.4.1. oft e EPRI r par.

SI refers o t, col ec ive 1n1 1 I AS. E Code S c ion IU and ec *on XI e ami

• AS E Co e Secfon I I e u*res 001/c co erage or Te ams AS E C de Secfon SI e mina io s in,of :n ra iograp ic tes in (R ) we e pe or e and fo nd accep abl for the a e e welds of he VEGP Jnits 1 a d 2 S an ozz es The cce a iii" oft e S E Cod.

n ions in ica s th t 100° coverage as ac ved uri g h se mina ion

• In a d*r on. S cti XI PS (UT) exa s w re pe orm some i h Ii i e co,er ge

• Co lectively. bot ex mi a ions co e ed 100 3/4 o he eld Al-2 to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020

• Fro EG/CR-720 D

C o fla s u itizing 10

• IS Se c1ve

, a I

re 3.6 of

-19086 prov* es h or ica rob bility of ves or RT e min ions of the POD cur o

- 908 c

e for UT i

u e -2 R

e o = B curve

• Th OD c mparison is s o n on the n slid

'Ce for ex rem ly s* all fl s (less ha

• 0.0 c es e POD cu --ve se

• ech ic l basis ca e

co se a 1,e ya ninim m la I

inches hie is gr ater ha xa i atio s e P O ISE *i ul ions *s 0.075 e fl w dep hs a w ic RT o erns Al-3 to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020

1.

0.8 OA 0.2 POD C rv 8 s don RT (Mo onserva ive from Figure 3.6 f Ref

)

o,.o ____....._ ____ __._ _ _...._ _ __._ _ ____...__ _______.....__......_ _ __,,

0 0.1 0.3 0.4 0.5 Crack oe,pttl1 ( n)

No,e: Reference [1, = EPRI report. and Reference [4] = PNNL 19086.

Al-4 8

to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020 of 9)

• F o S

C tive VEG,

-AL T-0 -04 f

For VEGP i s 1 a d 2 i

• io to PSI x mi o s. o r ISi e ami a io ave een p rforme fo e

S ozzle-to-s ell

• , nd ree ISi e a 1n ions h 1e been performed for e F nozzle-o-s el e ds II St i atio s o I em C2.2 for h Sa F

no 7 z s ha lim*

cove e r~ngin from -o 3/4 to 801/o.

I m

o. C2.22 er radii re om IS I em

o. C2.22 nozzle in e r ii h d 100% S co era e for I pa ISi ex mi a ions eeoe C2 2 a

SI over ge a a 10

.. ss 50o/c I I cove Al-5 pe e

9 to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020 Eva Pe Table 8-9 1 e EP Repo

. is t e Ii i in. loca *o for e

se case y

• Evalua *o a pe o or Ca e ID E

-P3 lte

o.

C2.21 s*ng e

O Versie

.0 sof e

PSI 00°/o cove a e a d subseq n * (SI co e

as as e

T see r os e e co s* ered*

The c rre E Code Sec io I e in t n rt; tr me.

hich i volves 10- ea in erva exam*na ions after he S na 10n SI a

0. _Q

0. 0. -o. 60. and 70 ye rs tern ive e

or VE U I s ree

-ye ions ar pe or e amina ion, fo o

aminatio on ISi a 10 _Q_ 30, n 60y Al-6 n 2 ed ert

'"'0-yea in erval 0

Cas ID to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020 S en-rio PSI ISi S h dule PmbabUity of' Rupture (pe*r Year at 80 years Probability of Leakage

. {per Year,at 80 years The p o of rup ure for 00 ISi ov r ge n 5 t

are iden remain unchange rom he es I s r

e only e pro c io I

I 1 0

rn ISi

/+

0 30+60 seen rios assu 1.

re ess lye I a 5.9x, o-.

ic is s ightfy ab ept rit non heP.=-lo1y 1 i

i r1 i t, Jir1 i Cl iii I

T e p ob o leaka e vs. time for e

ne riv id over s e nex slide) oinvesigated ISi scena iosis Al-7 to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020 Response to Open Audit Item 2.c.i.B (8 of 9)

I FEW~P3A Cum Prob. Of leak 0*1-.......... -....--ii...........---~----"---~---.......1----..,,_J 20 40 Time (Y ),

Al-8 to NL-20-1312 SNC Response to Item 2.c.i During the Continuation of the NRC Audit of the PROMISE Version 1.0 Software on July 27, 2020

• Limi ed co a e of as low as 50% or the 2

vG S nd -

ozzle-to-s II elds is ccep le fo ed operation for the a terna i e reques e by S OC The ro a ilitie o r p re or 50°/c ov r e or h r 1ng c are h ee or e s of magni ude betow ri for 80 y ars f he r ability o I ak ge for e rmiti g c se u ing he alterna iv IS sc ario (P I 10 0

0 60 is sit h y ove he acce c cri rion 5.9-x10-6 vs. 1 10- )*ho

• v r is pr ability o leak _g is air os iden *c I o he seen rio vhere he AS E Code.Section I 10-y r ISi examina ions are conti d hrough 70 years o o era ion

. 93x 1 o-6 The sli ht exceedance o he robabili ' o leakage o no compro 1i e pl n sa e y because press re bou d ry I aJ ge i e c able by plan p a ors n pl n proce ures alto for safe t

s u o once a y leak g is detec e, as escribed in Section 8...... 4.1.1 o he EP I p

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