ML22125A142

1 and 2 - March 22, 2022 e-mail - Sequoyah TSTF-505 LAR Supplemental Information

ML22125A142
Person / Time
Site:	Sequoyah
Issue date:	03/22/2022
From:	Perry Buckberg NRC/NRR/DORL/LPL2-2
To:	Victor W Tennessee Valley Authority
Buckberg P, NRR/DORL/LPL2-2
References
EPID L-2021-LLA-0145
Download: ML22125A142 (3)

Text

From:

Buckberg, Perry To:

Victor, William Ross Cc:

Taylor, Andrew Charles

Subject:

RE: Sequoyah TSTF-505 LAR Supplemental Information Date:

Tuesday, March 22, 2022 4:00:00 PM

Bill,

I concur with your list.

Thanks, Perry Buckberg Senior Project Manager / Agency 2.206 Petition Coordinator Office of Nuclear Reactor Regulation (301)415-1383 O-08D02

From: Victor, William Ross <wrvictor@tva.gov>

Sent: Tuesday, March 22, 2022 3:52 PM To: Buckberg, Perry <Perry.Buckberg@nrc.gov>

Cc: Taylor, Andrew Charles <actaylor@tva.gov>

Subject:

[External_Sender] Sequoyah TSTF-505 LAR Supplemental Information

Perry,

Please find below TVAs understanding of which Sequoyah TSTF-505 LAR Audit questions responses require docketing (as enhanced by the Staff Observations). I request your concurrence with this list, which will serve as a reference in the cover letter of the LAR Supplement (this was the approach taken by Duke Energy for their Shearon Harris TSTF-505 LAR Supplement).

R/ Bill Victor TVA Fleet Licensing 402-209-1282

Question Staff Observation APLA - 01 (Uncertainty analysis)

N/A APLA - 02 (Eagle 21 digital I&C )

Enhance discussion in several parts of response (e.g., Loop Calculation Processor (LCP) and common cause failures).

APLA/APLC - 03 (FLEX credit)

N/A APLA - 04 (Shared systems)

For Flag #62 (Boric Acid Tank Area Temp), the response states, this flag can be set to the more conservative position

APLA - 05 (Seasonal impacts) for RICT calculations. In the response, consider using more affirmative language (e.g., this flag will be set ).

For Flag/System #67, expand how will operators know (e.g.,

procedure) to adjust the associated flag in PHOENIX (e.g., ERCW header temp > 70 F versus < 70 F)?

APLA - 06.a (LCO 3.6.2.C)

In the response, clarify how the surrogates will be addressed for future RICT calculations.

APLA - 06.b (LCO 3.7.7.A)

For LCO 3.7.7.A in LAR Table E1-1 under PRA success criteria, add the appropriate logic (e.g., OR).

APLA - 06.c (LCO 3.7.8.B)

APLA - 07 (SOKC)

APLA - 08 (PRA update process)

In the response, expand on discussion of the types of qualitative evaluations/assessments used for determining unscheduled PRA updates.

APLA - 09 (MRule)

APLA - 10 (RICT implementation)

APLB - 01.a (Sensitive electronics)

APLB - 01.b (Obstructed plume)

APLB - 01.c (Well-sealed cabinet)

APLB - 01.d (Influence factors)

APLB - 01.e (Unit dependencies)

APLB - 02.a (Cable tracing)

In the response, enhance/strengthen discussions in Table APLB02-01 per discussions during Day 3 of audit.

APLB-02.b (Thermoplastic cable)

Enhance response statement that states, with a proportion of at least 5 percent that qualifies as thermoplastic.

APLC - 01 (Peer review F&Os)

APLC - 02 (Seismic CDF/LERF)

APLC - 03 (External flooding)

STSB - 01 (TS 5.5.18)

SCPB - 01 (LCO 3.6.8.B DSC)

EEEB - 01 (DSC for Elect TSs)

EEEB - 02 (DSC for TS 3.8.1.B)

EEEB - 05 (DSC for TS 3.8.7.A)

EEEB - 09 (Electrical RICTs)

EICB- 01 (SG water level)

EICB- 03 (LCO 3.3.2.F)

EICB- 04 (LCO 3.3.2.K)

Supplement LAR as describe in the response.

EICB- 05 (Defense in depth)

Provide the table in the response on the docket Supplemental Table E1-1 Provide updated Table E1-1 as provided in the portal to address Electrical Branch audit questions.