World Leader in Design, Manufacture and Service Support for BWR and PWR MSIV’s

Capabilities in Nuclear Power Generation

-Involved in Government and Commercial Nuclear Power for over 50 yrs
-Manufactured key safety related valves installed at Shippingport
-Supplied valves for the first US Naval Nuclear Reactors
-Supplied valves to most PWR and BWR sites in the U.S.
-Key Valve supplier in European and Asian Nuclear Reactors
-UK, France, China, Korea, Japan

-Industry renowned brands, each with a reputation for quality
-An extensive global installed base of nuclear valve products
-Growing an impressive base on the Gen III+ reactor design
-Actively working with SMR and Gen IV manufacturers for future valve requirements

-The Main Steam Isolation Valve is a quick closing design for high‐pressure steam service.
-The Main Steam Isolation Valve is normally held open by air pressure applied to the air‐actuating cylinder, spring closing on failure of air supply.
-An oil dashpot with adjustable metering valves controls the closing speed for BWR applications.
-It is a wye pattern type valve complete with actuator and accessory equipment. The valve is actuated with an air cylinder operator (air‐to‐open, air and/or spring to close).

HISTORY & DESIGN

-MSIV’s are designed to close quickly and seal tightly on the main steam line
coming off the reactor vessel (BWR) and main steam line of the steam generator on (PWR).

-The designs are different between a Boiler Water Reactor (BWR) and a Pressure Water Reactor (PWR)

-The valve is designed to fail closed within 3 to 5 seconds when tripped.

Difference Between BWR & PWR

BWR

  • 45 degree body seat with a 45.5‐46 degree poppet seat
  • Smaller upper structure with more springs
  • Nose guided poppet
  • Liners‐ Only at Nine Mile Unit 1, Oyster Creek & Tarapur‐ India
  • Seat rings‐ Only at Nine Mile Unit 1, Oyster Creek & Tarapur‐ India
  • Air spring closure
  • LLRT Requirement‐ General 11 scfh original requirement/ per valve
  • Some inboard /outside valves may be rolled up to 30 degrees
  • Dashpot speed controlled

PWR

  • Flat poppet and body seat
  • Larger upper structure with less springs
  • Skirt Seals
  • Articulated Pilot Poppet
  • Spring alone closure
  • No LLRT requirement, valve is in secondary system
  • Metered air speed controlled

Design Modification Features

  1. Design guided poppet (BWR only)
  2. Stabilized poppet design (BWR & PWR)
  3. Welded floating pilot poppet (BWR & PWR)
  4. Anti-rotation main and pilot poppet’s (BWR & PWR)
  5. Second bushing in the cover (BWR)
  6. Live loaded packing with out/leak-off (BWR & PWR)
  7. One piece forged anti-rotation stem (BWR & PWR)

Current Modification for Plant Hatch Unit II

-Original installation of (8) Rockwell Edwards 24″ MSIV’s, Drawing # PD‐ 421544 Rev. R on Unit II
-Trillium Flow Technologies installed /A&M internals into Unit II
-Experience from Unit I A&M valves led to major factor in modifying to
A&M design in Unit II
-We have modified six valves total to date with the remaining two scheduled for Spring 2017
-Modification includes Poppet stabilization, Nose Guided Poppet and One Piece Stem’ LLRT results from six modified MSIV’s:
-Valve Year Modified As left LLRT Result (SCFH) Year of Next LLRT As Found Result (SCFH)

ValveYear ModifiedAs left LLRT Result (SCFH)Year of Next LLRTAs Found Result (SCFH)
Inboard 22C20130.0620150.06
Outboard 28A20130.02201585.4*
Inboard 22A20150.42017
Inboard 22B20150.032017
Outboard 28B20152.32017
Outboard 28D20150.22017

*This number was with a control panel leak and actual seat tightness could not be verified.

A&M Retrofit Modification Process for Plant Hatch Unit II

-Trillium Flow Technologies Engineering Perform Equivalency / Reconciliation of Rockwell Edwards 24” MSIV’s Design
-Evaluate Existing MSIV Internal Mapping Data
-Reverse Engineer Rockwell Edwards Spare Parts
-Perform Plant Walk Downs for MSIV Locations
-Evaluate Existing Upper Structure for Reuse (Actuator / Spring Plates / Springs / Yoke Rods)
-Poppet / Main Disc & Bonnet / Cover are manufactured oversize to machine fit in field.

Wye Pattern MSIV Globe Valve

Design Benefits

– Excellent repeatable LLRT results
– Adjustable 3‐5 seconds closure time
– Lower pressure drop
– Price competitive versus MSIV Gate
– Low center of gravity
– Trillium Flow Technologies has largest BWR installed base with operational history

Design Enhancements

– Nose guided poppet
– Cover back seated poppet
– Welded floating pilot poppet
– Anti‐rotation main and pilot poppets
– Second bushing in the cover
– Live loaded packing w/o leak‐off
– One piece forged anti‐rotation stem

Turnkey Experience List

The Trillium Flow Technologies Valves Service Crew has performed (140) MSIV Modification’s and Maintenance activities since 2002 at the following Power Plant locations:

TVA Watts Bar Unit 1 & 2, Installed poppet stabilization mod, refurbish air cylinders & air panels every 5 years, (8 MSIV’s) and performed General Valve Maintenance.
TVA Sequoyah Unit 1 & 2, Installed one piece stem mod, refurbish air cylinders & air panels every 5 years, (8 MSIV’s) and performed General Valve Maintenance.
TVA Browns Ferry Unit 1, 2 & 3 Power Up rate, Installed mod to increased valve stroke by 4 inches for 20 % power up rate, installed nose guide and stabilized poppet’s, (24 MSIV’s) and performed LLRT & General Valve Maintenance.
Duke Power McGuire, Installed poppet stabilization mod, weld guide ribs as necessary, refurbish air cylinders every 5 years, (8 MSIV’s) and performed General Valve Maintenance.
Duke Power Catawba, Installed poppet stabilization mod, weld guide ribs as necessary, refurbish air cylinders every 5 years, (8 MSIV’s) and performed General Valve Maintenance.
SCANA VC Summer, MSIV outage maintenance, refurbish valve internals & rebuild air cylinder. (2 MSIV) (1) MSIV Modification
Southern Nuclear Plant Hatch, Installed poppet stabilization mod, refurbish valve internals. (6 MSIV’s) (2) MSIV Modifications
Southern Nuclear Plant Farley, Installed MSIV actuator mod, Internal valve inspections. (6 MSIV’s) (6) MSIV Modifications
First Energy Beaver Valley, Installed poppet stabilization mod. (8 MSIV’s)
First Energy Perry, Installed poppet stabilization mod. (8 MSIV’s)
South Texas Project, Stem Modification, refurbish valve internals. (8 MSIV’s)
Exelon Oyster Creek, Installed poppet stabilization mod, refurbish valve internals. (4 MSIV’s)
Exelon Limerick, Installed poppet stabilization mod. (16 MSIV’s)
Susquehanna, MSIV LLRT Failures, (4 MSIV’s)
Brunswick, MSIV Stem Replacements, (4 MSIV’s)
Nine Mile 2, MSIV LLRT Failures, (2 MSIV’s)

Turnkey Experience List

Recent (4) year MSIV work history: 2016

Hatch Unit 1, (2) A&M MSIV Modifications, (8) MSIV P.M.’s, February 2016
Brunswick, (4) MSIV rebuilds, (2) Actuator rebuilds, (8) MSIV P.M.’s, March 2016
Browns Ferry Unit 3, (1) MSIV LLRT Failures, (4) Actuator Rebuilds, (8) PM’s, March 2016
Susquehanna, (1) MSIV LLRT Failure, (2) MSIV Actuator Replacements, (8) MSIV P.M.’s March 2016
McGuire, (1) MSIV rebuild, (1) MSIV Actuator Replacement, (4) MSIV P.M.’s April 2016
Farley, (3) MSIV rebuilds, (3) MSIV Actuator Replacements, (5) Check Valves April 2016
Nine Mile,(2) MSIV LLRT Failures, (2) Actuator Replacements, (4) MSIV P.M.’s, April 2016
Catawba, (1) MSIV weld repair, (4) MSIV P.M.’s, September 2016

Farley, (3) MSIV rebuilds, (3) MSIV Actuator Replacements,(October 2016 Browns Ferry Unit 3, (1) MSIV LLRT Failures, (4) Actuator Rebuilds, (8) P.M.’s, October 2016 Sequoyah, (5) Main Steam Safety Valve Replacements November 2016

2015

Hatch Unit 2, (4) Rockwell MSIV Modifications, (8) MSIV P.M.’s, February 2015
Catawba, (3) MSIV rebuilds, (2) Actuator rebuilds, (4) MSIV P.M.’s, March 2015
Browns Ferry Unit 1, (2) MSIV LLRT Failures, (2) Actuator Rebuilds, (8) P.M.’s, March 2015
Perry, (5) MSIV Actuator Replacements, (8) MSIV P.M.’s, March 2015
Nine Mile, (2) RWCU Check Valve Repairs, March 2015
Sequoyah, (5) Anchor Darling Double Disc Valve Repairs, (5) Main Steam Safety Valve Replacements, April 2015
Susquehanna, (4) MSIV Actuator Replacements, (8) MSIV P.M.’s, April 2015
Pilgrim, (1) MSIV LLRT Failure, (2) MSIV Actuator Rebuilds, (8) MSIV P.M.’s, April 2015

Watts Bar, (1) MSIV Actuator / Control Panel Rebuild, (5) Drop & Swap Safety Valves, (9) Check Valves, Sept 2015
VC Summer, (1) MSIV Modification, (1) Actuator rebuild, (4) MSIV P.M.’s, October 2015

Sequoyah, (6) Anchor Darling Double Disc Valve Repairs, (5) Main Steam Safety Valve Replacements, Nov 2015

Turnkey Experience List

Recent (4) year MSIV work history:
2014
Browns Ferry, MSIV Actuator rebuilds, February 2014
Hatch Unit 1, (8) MSIV P.M.’s, February 2014
McGuire, (4) MSIV P.M.’s, March 2014
Susquehanna, (2) MSIV LLRT failures, (8) MSIV P.M.’s, April 2014
Watts Bar Unit 1, (1) MSIV Actuator & Control Panel rebuild, April 2014
Catawba, (2) MSIV rebuilds, (2) Actuator rebuilds, (4) MSIV P.M.’s, May 2014
Fitzpatrick, (1) MSIV LLRT failure, September 2014
McGuire, (1) MSIV rebuild, (5) 18″ Pacific valve repairs, September 2014
Browns Ferry, (1) MSIV LLRT failure, (1) Actuator rebuild, (8) PM’s, October 2014

2013
Browns Ferry, MSIV Actuator rebuilds, February 2013
Hatch Unit 2, (3) Rockwell MSIV LLRT failures, (8) MSIV P.M.’s, February 2013
River Bend, (1) MSIV LLRT failure, (8) MSIV P.M.’s, February 2013
McGuire, (4) MSIV P.M.’s, March 2013
Perry, (1) MSIV LLRT failure, (8) MSIV P.M.’s, March 2013
*Susquehanna, (8) MSIV P.M.’s, April 2013 worked performed by CVS as Subcontractor to CFS
Nine Mile, (1) MSIV LLRT failure, (8) MSIV P.M.’s, April 2013
Watts Bar Unit 1, (1) MSIV Actuator & Control Panel rebuild, June 2013
Catawba, (2) MSIV rebuilds, (2) Actuator rebuilds, (4) MSIV P.M.’s, September 2013
Sequoyah, (4) MSIV P.M.’s, October 2013
Catawba, (2) MSIV rebuilds, (2) Actuator rebuilds, (4) MSIV P.M.’s, November 2015

MSIV Enhancements

Nose Guided Poppet
Cover Backseated Poppet

Ask us about MSIV Field Maintenance Capabilities

Measurements are taken to verify that the boring bar is in the proper orientation on the center line

Boring bar set up

MSIV Tooling Rib Repair
MSIV Automatic Welding Machine

Manufacturing photos of first generation A&M
MSIVs from the late 1960’s/early 1970’s

Summary Slide 1 – Atwood & Morrill Main Steam Isolation Valves

-WVC USA is the World Leader in design, manufacture and service support for BWR and PWR MSIV’s
-Ask us about our extensive Experience List

Summary Slide 2 – Atwood & Morrill Turnkey Services

-Extend the life of your valves
-Drop & Swaps
-Machining and Welding
-Pre-outage Package Reviews
-Field Technical Support
-Home Office Engineering & Technical Support

Turnkey Field Services

-Field Crew to support MSIV, Testable Checks, Feedwater Checks and Extraction Checks
-All Crews are supported with A&M design documents, drawings and manufacturing
engineering support
-Drop & Swaps
-Machining and Welding to support refurbishment, as well as equipment upgrade
-Pre‐Outage Work Package Reviews
-Field Technical Support
-Home Office Engineering & Technical Support

EXTEND THE LIFE OF YOUR VALVES WITH OUR TURNKEY SERVICES