ML25189A104

From kanterella
Jump to navigation Jump to search
July 17, 2025 Pre-Application Meeting - GE Replacement Steam Dryer Presentation - Redacted
ML25189A104
Person / Time
Site: Hatch  Southern Nuclear icon.png
Issue date: 07/07/2025
From:
GE-Hitachi Nuclear Energy Americas, Southern Nuclear Operating Co
To:
Office of Nuclear Reactor Regulation
Shared Package
ML25189A101 List:
References
NL-25-0270
Download: ML25189A104 (1)
v • d • e


Text

Edwin I. Hatch Nuclear Plant - Units 1 & 2 July 17, 2025 Pre-Application Meeting to NL-25-0270 GE Replacement Steam Dryer presentation redacted (Public, non-proprietary)

Non-Proprietary Information EDWIN I. HATCH UNITS 1 & 2 REPLACEMENT STEAM DRYER EVALUATION APPROACH FOR EPU HITACHI 009N7769 R2 - 1

Non-Proprietary Information RSD NRC Presentation Outline

1. Introduction 1.1 Introduction 1.2 Overview
2. GEH Steam Dryer History 2.1 GEH OEM Steam Dryer EPU History 2.2 BWR/3 Quad Cities/Dresden Steam Dryer EPU History 2.3 Steam Dryer EPU Impact and RG 1.20 CVAP 2.4 Replacement Steam Dryer Design Improvements
3. Hatch OEM/RSD and RG 1.20 CVAP 3.1 Steam Dryer OEM vs. GEH RSD Design: Geometric Comparison 3.2 Plant vs. Prototype RSDs: Plant Operating Conditions 3.3 Steam Dryer FIV Loads 3.4 RSD Evaluation Approach vs. NRC RG 1.20 CVAP 3.5 Transient and Accident Load Stress Qualification 3.6 Replacement Steam Dryer Inspections 3.7 Risk and Mitigation 3.8 Plan 3.9 Summary
4. EPU License Amendment Documentation HITACHI 009N7769 R2 - 2

Non-Proprietary Information RSD NRC Presentation 1.1 Introduction

Background:

General Electric BWR/4 Mark I Containment Licensed Thermal Power History Original Licensed Thermal Power:

2436 MWt (1974/1978)

Stretch Power Uprate Approved:

2558 MWt (1995)

Extended Power Uprate Approved:

2763 MWt (1998)

Measurement Uncertainty Recapture Approved:

2804 MWt (2003)

Currently Licensed Thermal Power:

2804 MWt (Present)

Overall Project Objective:

Implement EPU program for Units 1 & 2 ((

))

Includes installation of a Replacement Steam Dryer Proposed EPU: 2960 MWt (5.6% increase from CLTP)

Meeting Objective:

Present Hatch Replacement Steam Dryer EPU Evaluation Approach and receive any NRC feedback/questions.

The steam dryer is a nonsafety-related component and performs no active safety function; however, the steam dryer must maintain structural integrity during normal, transient and accident conditions and not generate any loose parts that may interfere with the operation of the safety systems.

HITACHI Steam Dryer within RPV Replacement Steam Dryer

((

))

009N7769 R2 - 3

Non-Proprietary Information RSD NRC Presentation HITACHI 1.1 Introduction

((

)) Update:

((

)) evaluation is currently being performed.

No adverse effects to plant safety have been identified by introducing the GEH RSD into ((

)).

. ((

))

Notable Items:

((

)) The GEH RSDs are suited for the steam dryer loads mentioned in RG 1.20 Rev. 4 including FIV, MSL dead legs, VPF and SRV resonance.

. ((

)) High stress locations rely on steam dryer geometry than RPV size.

. ((

))

009N7769 R2 - 4

Non-Proprietary Information RSD NRC Presentation HITACHI 1.2 Overview Hatch Units 1 & 2 will be implementing EPU in ((

)), which will include an RSD The GEH RSD is qualified for EPU conditions at ((

))

Takeaways:

. ((

))

009N7769 R2 - 5

Non-Proprietary Information RSD NRC Presentation 2.1 GEH OEM Steam Dryer EPU History BWRType RPV Size (in)

OEM SD Hood Design BWR/3 II 205

((

BWR/4 183 BWR/4 II 205 BWR/41 218 BWR/41 II 218 BWR/4 251 BWR/51 II 201 BWR/5 251 BWR/6 II 218 BWR/6 218 BWR/6 II 238

))

(1) ((

))

(2) In 2013, unit experienced a 20% increase from OLTP with RSD.

Takeaways:

EPU Approval Year 19982 2001 (shut down 2020) 2006 (shut down 2014) 2002 1998 EPU/ 2003 MUR 2008 2007 2011 2002 2002 2002

  • A range of OEM steam dryers have gone to EPU successfully without an RSD.

HITACHI EPU Thermal Power 6% increase from OLTP 20% increase from OLTP 20% increase from OLTP 20% increase from OLTP 13/15% increase from OLTP

~19% increase from OLTP 20% increase from OLTP 20% increase from OLTP 12% increase from OLTP 20% increase from OLTP 20% increase from OLTP The curved hood steam dryer design is the best design compared to the slanted and square hood design.

009N7769 R2 - 6

Non-Proprietary Information RSD NRC Presentation 2.2 BWR/3 Quad Cities/Dresden Steam Dryer History Overview of BWR/3 OEM Steam Dryer EPU Experience:

BWR/3 QC/Dresden OEM steam dryers operated at OLTP for ~30 years with no structural issues The QC/Dresden EPU steam dryer failures (((

three causal factors:

. ((

))) had

))

((

Steam dryer structural integrity and fatigue failure concerns for EPU projects are a result of the BWR/3 failures that occurred at EPU.

Takeaways:

. ((

))

The BWR/4-6 OEM designs are structurally more robust.

HITACHI BWRL3 RSD BWR/3 SD PLTP and EPU Measured PSD Loads (Outer Hood Location) 009N7769 R2 - 7

))

Non-Proprietary Information RSD NRC Presentation HITACHI 2.3 Steam Dryer EPU Impact and RG 1.20 CVAP

  • After the Quad Cities Units 1&2/Dresden Units 2&3 steam dryer failures, the EPU projects for the rest of the fleet have followed RG 1.20 guidance ((

))

  • The NRC has recommended that the EPU fatigue analysis results show a factor of 2.0 margin to the ASME fatigue limit.
  • The factor of 2.0 margin was included primarily to address lack of benchmarking in indirect acoustic load measurement techniques.

. ((

  • As the steam dryer analysis methodologies have matured and have been benchmarked against on-dryer measurements, ((
  • The previous GEH RSDs ((

full CVAP performed.

))

)) were ((

))

)) with 009N7769 R2 - 8

Non-Proprietary Information RSD NRC Presentation 2.4 Replacement Steam Dryer Design Improvements GEH has designed the RSD with design improvements to maintain structural integrity at EPU conditions which includes:

. [ [

))

Takeaways:

HITACHI

((

))

  • As a result, the GEH RSD design is significantly more robust than the original steam dryer for Units 1 & 2.

Design improvements address all locations experiencing fatigue cracking in the GEH fleet of OEM steam dryers.

009N7769 R2 - 9

Non-Proprietary Information RSD NRC Presentation HITACHI 2.4 Replacement Steam Dryer Design Improvements (continued)

All installed GEH RSDs qualified through vibration design/test/inspection program for prototype steam dryers as laid out in RG 1.20 Rev. 4 Appendix A (Rev. 4 captures the experience and lessons learned from these prototype programs).

. ((

))

Lessons learned from operating experience of each prototype RSD were factored into subsequent RSD designs.

. ((

))

Takeaways:

  • The GEH RSD design has been refined over multiple design iterations and has been demonstrated to have adequate fatigue margin under a variety of acoustic loading conditions.

. ((

))

009N7769 R2 - 10

Non-Proprietary Information RSD NRC Presentation HITACHI 3.0 Hatch OEM/RSD and RG 1.20 CVAP The following section will go into more detail about Hatch as it relates to the OEM dryer, RSD, and the EPU approach for the RSDs:

3.0 Hatch OEM/RSO and RG 1.20 CVAP 3.1 Steam Dryer OEM vs. GEH RSD Design: Geometric Comparison 3.2 Plant vs. Prototype RSDs: Plant Operating Conditions 3.3 Steam Dryer FIV Loads 3.4 RSD Evaluation Approach vs. NRC RG 1.20 CVAP 3.5 Transient and Accident Load Stress Qualification 3.6 Replacement Steam Dryer Inspections 3.7 Risk and Mitigation 3.8 Plan 3.9 Summary 009N7769 R2 - 11

Non-Proprietary Information RSD NRC Presentation 3.1 Steam Dryer OEM vs GEH RSD Design: Geometric Comparison Component Steam Dryer Hood Design Support Ring - Inner/Outer Diameter Bank Height Bank to Bank Spacing Hood Entrance (Opening)

Outer Hood Thickness Inner and Middle Hood Thickness Cover Plate Thickness Base Plate Thickness Bank Top Cap Thickness Inlet End Plate Thickness - Outer/Inner Bank End Plate Thickness - Outer/Inner Hood Support Thickness Skirt Thickness/Drain Channel Thickness Support Ring - Height x Width Skirt Ring - Height x Width Takeaway:

The Hatch RSD adds ((

Hatch Unit 1 OEM SD

((

Hatch Unit 2 OEM SD HITACHI

((

((

))

))

))

))

009N7769 R2 - 12

Non-Proprietary Information RSD NRC Presentation HITACHI 3.2 Plant vs Prototype RSD: Plant Operating Conditions Component II

((

~L

(( ))1 EPJ L

((

J~[ ]~L

((

JL

((

EPU

))2 EPU EPU

)) EPU

)) EPU

~C-lL Rated Core Thermal Power (MWt) 2957 3952 3952 4408 2960 2960 Thermal Power: % of OL TP 18% increase 20% increase 20% increase 15 % increase 21.5% increase 21.5% increase 11 71 EPU Approval Year 2001 2017

((

(1)

((

)) EPU'" is an RSD named due to its earlier construction date for ((

)) and has a Mark I containment. Note that ((

(2)

((

)) EPU" is an RSD named due to its later construction date for ((

)) and has a Mark II containment.

Takeaways:

The comparison shows that ((

The MSL steam flow velocity and steam flow area for ((

))

Therefore, the ((

2008 2012

))

)) EPU" would be most similar to the ((

)) EPU" plant in terms of general plant setup.

))

))

009N7769 R2 - 13

Non-Proprietary Information RSD NRC Presentation HITACHI 3.3 Steam Dryer FIV Loads 11-Ei*t-Design Hatch Units 1 & 2

((

RSD EPU Projected PSD Loads Comparison: ((

)) (Entire Dryer)

((

))

))

Takeaways:

The comparison shows that ((

))

Most notable is that the MSL flow velocity for ((

))

009N7769 R2 - 14

Non-Proprietary Information RSD NRC Presentation HITACHI 3.3 Steam Dryer FIV Loads Expected Hatch EPU FIV Loads for Units 1 & 2 -versus-GEH Prototype RSD Loads Hatch Units 1 & 2 RPV diameter is 218 inches as compared to the successful 251-inch diameter GEH prototype RSDs.

However, ((

))

((

)) in the Hatch RSD has increased significantly as compared to the OEM dryers for Hatch Units 1 & 2 in identified critical locations such as the outer hood, cover plate, end plates, hood supports, etc.

The MSL steam flow for EPU at ((

The range of acoustic and FIV load conditions for ((

. [ [

Takeaway:

As a result, ((

))

))

Based on GEH OEM and RSD operating experience along with successful CVAP of the GEH prototype RSDs, the Hatch Units 1 & 2 RSD meets RG 1.20.

))

))

009N7769 R2 - 15

Non-Proprietary Information RSD NRC Presentation HITACHI 3.4 RSD Evaluation Approach vs. NRC RG 1.20 CVAP RG 1.20 CVAP Appendix A - "Prototype" Steam Dryer

1)

A comprehensive vibration and stress analysis program,

2)

An extensive vibration measurement program, and

3)

A full inspection program Previous GEH Replacement Steam Dryers are ((

))

Steam dryers are non-safety related components; however, the GEH RSDs followed the ((

guidelines for structural integrity for the past EPU programs.

Previous GEH EPU RSD projects, the NRC recommended analysis, instrumentation and inspections.

((

)) RSDs were retrofit after EPU due to OEM dryer ((

)).

)) RG 1.20

((

)) RSDs performed predictive structural analyses based on plant-specific measurements as part of the EPU license submittal.

Previous GEH RSDs have met the key RG 1.20 standards:

"Successful CVAP including analysis, extensive measurement, full inspection and no adverse vibration effects".

"No evidence of loose parts, cracking, unacceptable motion, or significant wear following the inspection program".

Takeaway:

Therefore, the previous GEH RSDs are now classified as ((

))

009N7769 R2 - 16

Non-Proprietary Information RSD NRC Presentation 3.4 RSD Evaluation Approach vs. NRC RG 1.20 CVAP Hatch Units 1 & 2 GEH Replacement Steam Dryer ((

)):

The significant structural margin improvements achieved with the GEH prototype RSD design and iterations.

Variety of EPU plant loads included in the GEH prototype RSD development basis.

Successful validation of GEH acoustic and stress analysis methodologies used to develop the RSDs.

Years of successful operating history at EPU for both the fleet OEM and RSDs.

. [ [

Using the RG 1.20 categories:

The previous curved hood GEH RSDs are ((

The Hatch Units 1 & 2 RSD design ((

Takeaway:

. ((

))

))

))

HITACHI

))

009N7769 R2 - 17

Non-Proprietary Information RSD NRC Presentation 3.5 Transient and Accident Load Stress Qualification The Hatch RSD is significantly stronger than the Hatch OEM steam dryer and ((

Takeaway:

. ((

))

HITACHI

))

009N7769 R2 - 18

Non-Proprietary Information RSD NRC Presentation 3.6 Replacement Steam Dryer Inspections The Hatch Replacement Steam Dryer Inspection Plan will be:

. [ [

))

Takeaway:

HITACHI

  • Therefore, the proper inspection plans and procedures will provide adequate status of the RSD for Hatch Units 1 & 2.

009N7769 R2 - 19

RSD NRC Presentation 3.7 Risk and Mitigation Risk:

. [ [

Risk Mitigation:

The increase in current thermal power to ((

The previous RSDs were designed for ((

RSD design analysis methodology ((

Takeaway:

. [ [

))

Non-Proprietary Information HITACHI

))

))

))

))

009N7769 R2 - 20

RSD NRC Presentation 3.8 Plan Initial Plan for Hatch ((

Contingency Option 1 - ((

Contingency Option 2:

. [ [

Takeaway:

. ((

Non-Proprietary Information contingency plans will be in place to address any issues.

HITACHI

))

))

))

] ],

009N7769 R2 - 21

RSD NRC Presentation 3.9 Summary FIV/Acoustic Loading

. [ [

The QC/Dresden OEM dryer ((

))

Non-Proprietary Information The GEH OEM dryer experience at EPU for the rest of the fleet has been satisfactory.

. [ [

))

The GEH prototype RSD design has gone ((

))

HITACHI

))

009N7769 R2 - 22

RSD NRC Presentation 3.9 Summary

. ((

Takeaway:

. ((

Non-Proprietary Information HITACHI

))

))

009N7769 R2 - 23

Non-Proprietary Information RSD NRC Presentation 4.0 EPU License Amendment Documentation EPU Licensing Documentation for GEH Prototype RSD plants submitted for NRC review/approval consisted of:

. [ [

Takeaway:

. ((

))

HITACHI

))

009N7769 R2 - 24

Non-Proprietary Information RSD NRC Presentation HITACHI 4.0 EPU License Amendment Documentation EPU Licensing Documentation for Hatch Units 1 & 2 RSD plants to be included in EPU LAR submittal consisting of:

. [ [

))

009N7769 R2 - 25

Non-Proprietary Information RSD NRC Presentation HITACHI Thank You!!

Hatch Replacement Steam Dryer Evaluation Approach for EPU Program 009N7769 R2 - 26

Retrieved from "https://kanterella.com/w/index.php?title=ML25189A104&oldid=5518902"