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 N/A (Uncertainty analysis)

Enhance discussion in several APLA - 02 (Eagle parts of response (e.g., Loop 21 digital I&C ) Calculation Processor (LCP) and common cause failures).

APLA/APLC - 03 N/A (FLEX credit)

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

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

(Seasonal impacts)

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)?

In the response, clarify how the APLA - 06.a (LCO surrogates will be addressed for 3.6.2.C) future RICT calculations.

For LCO 3.7.7.A in LAR Table APLA - 06.b (LCO E1-1 under PRA success 3.7.7.A) criteria, add the appropriate logic (e.g., OR).

APLA - 06.c (LCO 3.7.8.B)

APLA - 07 (SOKC)

In the response, expand on discussion of the types of APLA - 08 (PRA qualitative update process) 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)

In the response, enhance/strengthen discussions APLB - 02.a (Cable in Table APLB02-01 per tracing) discussions during Day 3 of audit.

Enhance response statement APLB-02.b that states, with a proportion of (Thermoplastic cable) 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 Supplement LAR as describe in 3.3.2.K) the response.

EICB- 05 (Defense Provide the table in the in depth) response on the docket Provide updated Table E1-1 as Supplemental provided in the portal to address Table E1-1 Electrical Branch audit questions.