ML070570310
| ML070570310 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 01/19/2006 |
| From: | Rideout H Entergy Nuclear Operations |
| To: | Office of Nuclear Reactor Regulation |
| O'Hara T, RI/DRS/PSB2, (610) 337-5043 | |
| References | |
| AMRC-01, Rev 0 | |
| Download: ML070570310 (33) | |
Text
VYNPS License Renewal Project Aging Management Review of the Primary containment AMRC-01 Revision 0 Page 2 of 33 REVISION DESCRIPTION SHEET Revision Number Description Pages and/or Sections Revised 0
Initial Issue
VYNPS License Renewal Project Aging Management Review of Primary Containment AMRC-01 Revision 0 Page 3 of 32 Table of Contents 1.0 Introduction................................................................................................................ 4 1.1 Purpose........................................................................................................................ 4 1.2 Structure Description.................................................................................................... 4 1.3 Intended Functions....................................................................................................... 6 2.0 Screening.................................................................................................................... 7 3.0 Aging Effects Requiring Management................................................................... 13 3.1 Steel........................................................................................................................... 13 3.2 Threaded Fasteners................................................................................................... 16 3.3 Concrete..................................................................................................................... 16 3.4 Fire Barriers................................................................................................................ 20 3.5 Elastomers................................................................................................................. 20 3.6 Flouropolymers and Lubrite Sliding Surfaces............................................................. 21 3.7 Operating Experience................................................................................................. 21 4.0 Demonstration That Aging Effects Will Be Managed............................................ 22 4.1 Containment In-service Inspection - (CII)................................................................... 22 4.2 In-service Inspection - (ISI)........................................................................................ 22 4.3 Containment Leak Rate.............................................................................................. 22 4.4 Structures Monitoring Program.................................................................................. 23 4.5 Time-Limited Aging Analyses..................................................................................... 23 5.0 Summary and Conclusions..................................................................................... 24 6.0 References................................................................................................................ 25
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 4 of 33 1.0 Introduction 1.1 Purpose This report documents the structural aging management review (AMR) of the Vermont Yankee Nuclear Power Station (VYNPS) primary containment structure. The aging management review (AMR) is part of the integrated plant assessment (IPA) performed to extend the operating license of VYNPS. This review is limited to the primary containment system and its components and commodities. The areas outside this boundary, reactor building or secondary containment are discussed in engineering report AMRC-02 (Ref. 14a). For additional information on the license renewal project overall scope and documentation, refer to engineering report LRPG-01, License Renewal Project Plan.
The purpose of this report is to document the aging management review of the VYNPS primary containment and its structural components and commodities. In accordance with guidance in NEI 95-10 (Ref. 2), the approach for demonstrating the management of aging effects is to first identify the structures components and commodities that are subject to aging management review.
These components and commodities perform an intended function without moving parts or a change in configuration (i.e., passive) and are not subject to replacement based on qualified life or specified time period (i.e., long-lived).
Applicable aging effects were determined using EPRI 1002950 (Ref. 4), EPRI TR-103842 (Ref.
3), and NUREG-1557 (Ref. 6). These reports provide the generic bases for identification of the aging effects based on specific materials and environments and document the confirmation of the validity of the aging effects through review of industry experience. This aging management review report (AMRR) documents the identification and evaluation of aging effects requiring management for the primary containment.
1.2 Structure Description The VYNPS primary containment system (PCS) is a low leakage pressure suppression containment system housing the reactor pressure vessel (RPV), the reactor coolant recirculation loops, and other branch connections of the reactor primary system (Ref.9). The PCS consists of a drywell and a torus or suppression chamber connected by vent pipes. The drywell surrounds the RPV and primary systems. The torus, a toroidal structure containing water, is located below the drywell. The vent system connecting the drywell to the torus terminates below the water surface of the torus. Torus-to-drywell vacuum relief valves, in conjunction with the reactor building-to-torus vacuum relief valve assemblies, maintain the design basis negative pressure requirements to protect the integrity of the primary containment from negative pressure. When operating at power, the containment is flooded with nitrogen to preclude the availability of oxygen.
The PCS (referred to in this report as the drywell) is designed to sustain the expected maximum internal pressure and temperature and the maximum net unbalanced transient loads to limit offsite doses resulting from a postulated LOCA to below values set forth in 10 CFR 100. The drywell includes portions of the safety relief valve discharge lines (SRVDL) in the torus airspace that span the distance between the vent system and the T-quenchers located below the torus water level.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 5 of 33 Concrete floor slabs, structural steel floors, and platforms are provided inside the drywell as required. Support for these structures is provided by the drywell or by concrete or structural steel columns, supported by the drywell base slab.
Threaded fasteners are steel commodities required to secure or hold structural components in place. Examples are reactor vessel support bolting, torus external support bolting and piping restraint bolting. The bolted joints or bolted connections encompass such constituents as bolts, studs, screws, nuts, washers, and member facing surfaces (i.e., mating surfaces of the bolted parts).
Anchors and embedments are steel commodities, such as angles and anchor studs, that are embedded in concrete and serve to anchor the support steel for various components. In addition, other anchors and embedments are provided that serve to transfer loads into the concrete cylinder wall or foundation mat from attachments to the drywall liner. These anchors are shown on VYNPS Drawings G-191707 through G-191710.
The design of the primary containment structure conforms to applicable codes and specifications listed in UFSAR, Section 12.2 (Ref. 9):
The major structural components of the VYNPS drywell are described below.
Bellows (Reactor vessel and Drywell)
The refueling bulkhead assembly has two bellows, backing plates, and removable guard rings.
The bellows are constructed of stainless steel (Ref. 9). The backing plate surrounds the bellows outer circumference for protection and is equipped with a tap for testing and for monitoring leakage. A self energizing spring seal is between the refueling bulkhead and the backing plate.
The guard ring attaches to the assembly and protects the bellows inner circumference. The assembly is welded to the reactor bellows support skirt and the reactor well seal bulkhead plate.
The reactor refueling bellows assembly is welded to the reactor vessel shell flange. The reactor well seal bulkhead plate bridges the distance to the primary containment drywell wall. Watertight hinged covers are bolted in place for refueling operation. For normal operation, these covers are opened to permit ventilation in the region above the reactor well seal. The drywell to reactor building bellows assembly is similar to the RPV bellows assembly. Bellows components are subject to fatigue due to cyclic loadings. Refer to UFSAR Section C.2.5.3 for description of fatigue transients (Ref. 9).
Sacrificial Shield Wall The sacrificial shield wall attenuates neutron and gamma radiation from the reactor to allow access and maintenance of the drywell. It also reduces exposure to drywell components that could be damaged by gamma radiation. The sacrificial shield is a high density, concrete filled cylindrical structure surrounding the vessel. The concrete is contained by inner and outer steel liner plates and structural beams that are also used to attach various system supports.
The sacrificial shield wall provides lateral support for the reactor vessel to accommodate both seismic forces and jet forces resulting from the breakage of any pipe attached to the reactor vessel. Lateral support for the sacrificial shield wall is provided by eight pairs of stabilizers. The stabilizers consist of steel pipes welded to the top of the sacrificial shield and bolted to fittings on the primary containment wall. (Ref. 38c)
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 6 of 33 Drywell The drywell is a carbon steel structure that houses the reactor vessel and its associated components. A reinforced concrete support structure, founded on bedrock, is an integral part of the drywell support system. Above the transition zone between the spherical and cylindrical portions, the drywell is separated from the reactor building reinforced concrete by a 2 inch gap.
This gap allows for drywell thermal expansion. Shielding over the top of the drywell is provided by removable, segmented, reinforced concrete shield plugs located on the reactor building refuel floor. The reinforced concrete drywell floor contains the drywell floor drain and equipment drain sumps, and supports the reactor pedestal. Drywell mechanical penetrations are subject to fatigue due to cyclic loading. (Ref.9).
Torus The torus (suppression chamber) is a torus-shaped carbon steel pressure vessel below and encircling the drywell. The torus is anchored to the reinforced concrete foundation slab of the reactor building.
1.3 Intended Functions The primary containment is designed to safely house and support safety-related equipment during normal and accident conditions including external events (tornadoes, earthquakes, floods, missiles) and internal events (LOCA, pipe breaks). Specifically, the drywell intended functions include the following.
Intended Function Abbreviations Definition Flood barrier FLB Provide flood protection barrier (internal and external flooding event)
Heat sink HS Provide heat sink during SBO or design basis accidents (includes source of cooling water for plant shutdown)
Missile barrier MB Provide missile barrier (internally or externally generated)
Pressure boundary PB Provide pressure boundary or essentially leak tight barrier to protect public health and safety in the event of postulated design basis events Support for Criterion (a)(2) equipment SNS Provide structural or functional support to nonsafety-related equipment whose failure could prevent satisfactory accomplishment of required safety-related functions (includes II/I considerations)
Shelter or protection EN Provide shelter or protection to safety-related equipment (includes HELB, radiation shielding and pipe whip restraint)
Support for Criterion (a)(1) equipment SSR Provide structural or functional support to safety-related equipment
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 7 of 33 2.0 Screening Structural commodities are structural members that support or protect system components, mechanical piping or electrical lines. Structural commodities that are unique to the drywell structure are evaluated in this report. Those that are common to VYNPS in-scope systems and structures (i.e. consumables, anchors, embedments, equipment supports, instrument panels, racks, cable trays, and conduits) are evaluated in the bulk commodities AMR.(Ref. 14b)
For this report, passive, long-lived structural components or commodities subject to AMR are identified in accordance with LRPG-06 (Ref. 13). Long-lived components and commodities are those that are not replaced based on a qualified life or specified period. Long-lived, passive structural components and commodities are divided into structural material groups. This report will examine the aging effects based on materials of construction rather than on a specific component or commodity basis. The following structural materials are relevant to VYNPS.
steel threaded fasteners concrete fire barriers elastomers flouropolymers and lubrite sliding surfaces Sub-materials for structural components or commodities are grouped into one or more of the overall structural material groups (e.g., non-shrink grout, brick and block are grouped with concrete, aluminum is grouped with steel, and roofing material is grouped with elastomers.)
Although consumables may be part of components or commodities subject to AMR and important in maintaining the integrity of the component or commodity (i.e. support the component or commodity function), they are not subject to AMR since they are either periodically replaced or inspected and replaced as needed during preventive maintenance activities.
As discussed in Section 1.3, a structure is within the scope of license renewal if it performs an intended function as identified in 10 CFR 54.4(b). An in-scope structures structural components and commodities that perform one or more structural functions associated with the structures intended function are subject to aging management review if they are passive and long-lived.
Structural components and commodities of the primary containment are listed in Tables 2.1-1 through 2.1-5 along with the identification of whether they are subject to aging management review. Justification for the determination is included in the tables.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 8 of 33 Table 2.1-1 Steel and Other Metals Subject to AMR Component/
Commodity Intended Function¹ Subject to AMR Remarks Material Anchorage/
embedments NA NA Addressed in the bulk commodities AMR (Ref. 14b)
NA Base plates NA NA Addressed in bulk commodities AMR (Ref. 14b)
NA Bellows (reactor vessel and drywell)
PB,SSR Yes Maintains pressure boundary for dry well. (Ref. 9,38v)
Stainless steel Cable trays and conduits NA NA Addressed in bulk commodities AMR (Ref. 14b)
NA Component and piping supports for ASME Class 1, 2, 3 and MC NA NA Addressed in the bulk commodities AMR. (Ref. 14b)
NA Component and piping supports NA NA Addressed in bulk commodities AMR (Ref. 14b)
NA CRD removal hatch EN, FLB, MB,PB,SSR, Yes Provides missile and flood protection for CRD and PCS components.
(Ref. 38r)
Carbon steel Drywell head EN,FLB, MB, PB, SSR Yes The drywell head maintains the pressure boundary of the drywell.
(Ref. 38c,r)
Carbon steel Drywell shell EN,FLB, MB,PB, SSR, Yes Maintains the pressure boundary of the drywell. (Ref. 38c, r)
Carbon steel Drywell shell protection panels (jet deflectors)
EN, MB Yes Panels prevent possible damage to the vent pipes from jet forces. (Ref 9 )
Carbon steel Drywell sump liner SSR Yes Provides functional support of drywell components. (Ref. 38p)
Carbon steel Drywell to torus vent line bellows PB, SSR Yes The bellows allow for the relative movement between the piping penetration and the drywell shell during normal operations and for design basis events maintaining the drywell pressure boundary. (Ref. 9 &
38q)
Stainless steel Drywell to torus vent system PB, SSR Yes Relieves drywell pressure to torus providing pressure boundary for drywell and torus (Ref 9 &38q )
Carbon steel Equipment hatch EN,FLB, MB,PB, SSR, Yes Hatch cover maintains pressure boundary of drywell. Safety related (Ref. 9 & 38r )
Carbon steel Monorails NA NA Addressed in bulk commodities AMR (Ref. 14b)
NA
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 9 of 33 Table 2.1-1 Steel and Other Metals Subject to AMR Component/
Commodity Intended Function¹ Subject to AMR Remarks Material Personnel airlock EN, FLB, MB, PB, SSR Yes Maintains drywell pressure boundary (Ref. 9 &38r)
Carbon steel Primary containment electrical penetrations PB, SSR Yes Mechanical penetrations through the drywell wall provide the means for process piping to enter the drywell while maintaining the essentially leak-tight barrier. (Ref. 9, 38r )
Carbon steel Primary containment mechanical penetrations (includes those w/bellows)
PB, SSR Yes Mechanical penetrations through the drywell wall provide the means for process piping to enter the drywell while maintaining the essentially leak-tight barrier. (Ref. 9 & 38r)
Carbon steel Reactor vessel support assembly SSR Yes Provide structural support of the reactor vessel. (Ref. 9)
Carbon steel Reactor vessel stabilizer supports SSR Yes Provide structural support of the reactor vessel. (Ref. 9)
Carbon steel Refueling bulkhead assembly NA No The drywell-to-reactor building refueling seal and the reactor pressure vessel (RPV)-to-drywell refueling seal, in conjunction with the refueling bulkhead provides a watertight barrier to permit flooding above the RPV flange while preventing water from entering the drywell. This is not a license renewal intended function. (Ref.9,38u )
NA Sacrificial shield wall lateral supports EN, MB,SSR Yes Class I component that provides lateral support for the sacrificial shield wall. (Ref.38e)
Carbon steel Sacrificial shield wall (steel portion)
EN, MB,SSR Yes The sacrificial shield liner plate provides protection and support of the high density, steel embedded, concrete cylindrical structure surrounding the vessel. (Ref. 9, 38e)
Carbon steel Stairway, handrail, platform, decking, and ladder (including torus catwalks)
NA NA Addressed in bulk commodities AMR (Ref. 14b)
NA Structural steel:
plates, columns and beams SSR Yes Provide structural support.
Carbon steel
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 10 of 33 Table 2.1-1 Steel and Other Metals Subject to AMR Component/
Commodity Intended Function¹ Subject to AMR Remarks Material Torus electrical penetrations PB, SSR Yes Maintains drywell pressure boundary.
(Ref. 38h)
Carbon steel Torus external supports (columns, saddles)
SSR Yes Provides support of the torus for design events (Ref. 38i,j)
Carbon steel Torus manway PB, SSR Yes Maintains drywell pressure boundary.
(Ref. 38o)
Carbon steel Torus mechanical penetrations PB, SSR Yes Maintains drywell pressure boundary.
(Ref. 38h)
Carbon steel Torus ring girder SSR Yes Provides support of the torus for design events (Ref. 38i,j)
Carbon steel Torus shell PB, SSR Yes Maintains drywell pressure boundary.
Carbon steel Torus thermowells PB, SNS Yes Maintains torus pressure boundary.
(Ref. 38k)
Carbon steel Vent header support SSR Yes Provides support of vent headers during design basis events. (Ref.
38q)
Carbon steel Notes:
- 1. See Section 1.3 for intended function descriptions. Functions also apply to welds. Welds are a sub-materials of steel.
Table 2.1-2 Threaded Fasteners Subject to AMR Component/
Commodity Intended Function¹ Subject to AMR Remarks Material Anchor bolts NA NA Addressed in bulk commodities AMR (Ref. 14b)
NA ASME Class 1, 2, 3 and MC support bolting NA NA Addressed in bulk commodities AMR (Ref. 14b)
NA Structural bolting NA NA Addressed in bulk commodities AMR (Ref. 14b)
NA
- 1. See Section 1.3 for intended function descriptions.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 11 of 33 Table 2.1-3 Concrete Subject to AMR Component/
Commodity Intended Function¹ Subject to AMR Remarks Material Drywell sump SSR Yes Provides functional support of drywell components.
Reinforced concrete Equipment hatch concrete plug EN, MB, SSR Yes Provides missile protection for the drywell access leak-tight barrier.
Reinforced concrete Floor slabs, walls EN, FLB, MB,
- SSR, Yes Provides functional support for reactor pedestal and protection of drywell shell.
Reinforced concrete Foundation EN, FLB, PB, SSR, Yes Serves as the structural foundation support for the primary containment.
Reinforced concrete Reactor vessel support pedestal SSR Yes The reactor pedestal is a cylindrical reinforced concrete structure which provides support for the reactor pressure vessel (Ref. 38g)
Reinforced concrete Sacrificial shield wall (concrete portion)
EN, MB, SSR Yes Supports primary shield wall encased by steel cylinders providing support of various system components as well as shielding.
Concrete
- 1. See Section 1.3 for intended function descriptions.
Table 2.1-4 Elastomers Subject to AMR Component/
Commodity Intended Function¹ Subject to AMR Remarks Material Drywell floor liner seal EN, SSR Yes Provides protection for drywell liner plate at its intersection with the concrete boundary.
Elastomer Seals and gaskets (doors, manways and hatches)
NA NA Addressed in bulk commodities AMR (Ref. 14b).
NA Primary containment electrical penetration sealant PB, SSR Yes Provide pressure boundary for primary containment electrical penetrations.
Elastomer
- 1. See Section 1.3 for intended function descriptions.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 12 of 33 Table 2.1-5 Flouropolymers and Lubrite Sliding Surfaces Subject to AMR Component/
Commodity Intended Function¹ Subject to AMR Remarks Material Lubrite plates SSR Yes Lubrite plates support intended function of torus supports.
(Ref.38i,j,s,t )
Lubrite
- 1. See Section 1.3 for intended function descriptions.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 13 of 33 3.0 Aging Effects Requiring Management The Structural Tools (Ref. 4), EPRI Report #TR-103842 (Ref. 3), NUREG-1557 (Ref. 6), and NUREG-1801 (Ref. 5) are utilized to identify and evaluate potential aging effects. The conclusions reached by these documents are summarized in LRPG-06, Structural Screening and Aging Management Reviews (Ref. 13). The materials and environments that were evaluated by these reports contain various aging effects which were found applicable to structural components.
For the evaluated materials and environments found at VYNPS, the conclusions reached for those materials and environments are applicable.
The identified aging effects for the primary containment structure are addressed in the following subsections.
3.1 Steel 3.1.1 Description and Scope The carbon and stainless steel components of the primary containment must be capable of resisting the forces and environmental conditions resulting from normal operation, design basis accident conditions, and natural phenomena. This capability is ensured in the design phase by component design specifications, structural analysis for the postulated loads, and material specification commensurate with the expected condition.
The structural components subject to AMR as indicated in Table 2.1-1 are addressed in this section.
3.1.2 Environments Carbon and stainless steel associated with the drywell and torus structure and subject to aging management review is exposed to environmental conditions in the general categories of protected from weather exposed to fluid environments.
3.1.2.1 Protected from Weather Steel protected from weather may be exposed to interior ambient temperature up to 165ºF, relative humidity up to 100 percent (%), and neutron and gamma radiation (Ref. 9). Steel components attached to high temperature systems in buildings protected from weather may be subjected to a maximum operating temperature of 575ºF (Ref. 9). Steel protected from weather may temporarily be in contact with aggressive chemicals resulting from accidental spills.
However, since spills are cleaned relatively quickly in accordance with plant housekeeping procedures, this is not an environmental factor.
3.1.2.2 Exposed to Fluid Environments The torus contains a large volume of treated water. This water has a high oxygen concentration (Ref. 4, 9).
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 14 of 33 3.1.3 Aging Effects The information used to determine aging effects for accessible and inaccessible steel (including welds) is discussed in LRPG-06, Structural Screening and Aging Management Reviews (Ref. 13).
Referring to Appendix 2 of LRPG-06, potential aging effects and associated aging mechanisms for carbon steel and stainless steel exposed to the environments discussed above are shown in Table 3.1-1.
Table 3.1-1 Summary of Potential Aging Effects For Steel Aging Effect Potential Aging Mechanism Protected from Weather Exposed to Fluid Environments General corrosion CS CS Galvanic corrosion CS Crevice corrosion SS Pitting corrosion CS,SS Erosion corrosion CS Microbiologically induced corrosion CS, SS Wear Loss of material Aggressive environment Hydrogen damage Stress corrosion Fatigue CS,SS Cracking IGA Creep Mechanical distortion Fatigue Elevated temperature CS Thermal aging Irradiation embrittlement3 CS Change in material properties Intermetallic embrittlement Notes:
(1) CS = carbon steel and low alloy steel (2) SS = stainless steel (3) For fluence levels greater than 1018 n/cm2 (E>1Mev).
For the primary containment structure carbon and stainless steel components and commodities in the environments indicated in Table 3.1-1 above, the following subsections identify the aging effects requiring management.
3.1.3.1 Protected from Weather Loss of material due to general corrosion is an aging effect requiring management for carbon steel protected from weather.
Cracking due to fatigue is an aging effect requiring management for the stainless steel bellows and carbon steel torus protected from weather.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 15 of 33 Change in material properties due to elevated temperatures within the drywell is not an aging effect requiring management. Temperatures within the drywell are maintained well below the threshold where material property changes would occur. (Ref. 9)
Change in material properties of carbon steel may result from irradiation embrittlement. The location inside the drywell where radiation may approach a level to initiate degradation is protected by a sacrificial shield wall around the reactor vessel. This shield wall is provided to limit the effects of radiation outside this wall. Therefore, change in material properties of the drywell steel due to irradiation embrittlement is not an aging effect requiring management. (Ref. 9) 3.1.3.2 Exposed to Fluid Environments Loss of material due to general corrosion is an aging effects requiring management for carbon steel exposed to treated water.
Loss of material due to crevice corrosion and pitting corrosion is an aging effects requiring management for carbon and stainless steel in treated water with oxygen levels >100 ppb.
Loss of material due to galvanic corrosion is not an aging effect requiring management because carbon steel components of the drywell structure in treated water are not in contact with metals of different potential.
Loss of material due to erosion is not an aging effect requiring management because flow rates in the torus are well below the threshold value.
Loss of material due to microbiologically induced corrosion is an aging effect requiring management for carbon steel in treated water because there is potential for impurities to exist in the torus treated water.
3.1.3.3 Summary Table 3.1-2 summarizes the aging effects requiring management for the VYNPS primary containment steel components and commodities.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 16 of 33 Table 3.1-2 Summary of Aging Effects Requiring Management For Steel Aging Effect Aging Mechanism Protected from Weather Exposed to Fluid Environments CS SS CS SS General corrosion Y
Y Galvanic corrosion Crevice corrosion Y
Y Pitting corrosion Y
Y Erosion corrosion Loss of material Microbiologically induced corrosion Y
Y Hydrogen damage Stress corrosion Fatigue Y
Y Cracking IGA Notes:
(1) CS = carbon steel (2) SS = stainless steel 3.2 Threaded Fasteners Structural component bolting applications within the primary containment structure include bolted joints and threaded connections, collectively referred to as threaded fasteners. Threaded fasteners include bolts, studs, screws, nuts, washers, expansion anchors, undercut anchors, drywell head bolts and member facing surfaces (i.e., mating surfaces to the bolted parts) of a bolted joint.
Threaded fasteners contained within the primary containment structure are addressed in the bulk commodities AMR (Ref. 14b).
3.3 Concrete 3.3.1 Description and Scope This section evaluates the drywell concrete components that include the drywell structural foundation, floor slabs (including associated beams), sacrificial shield wall, drywell sump, equipment hatch concrete plug and reactor vessel pedestal. Non-shrink grout, epoxy grout, embedments (i.e., plates and grouted anchors below the concrete surface), and reinforcement (i.e., embedded bars, wires, and strands) are subcomponents of concrete.
Table 2.1-3 provides a list of drywell concrete components and their intended functions. To accomplish the functions identified in Table 2.1-3, the drywell concrete components must be capable of resisting the forces and environmental conditions resulting from normal operation and design basis accident conditions. The capability of drywell concrete components is ensured in the design phase by component design specifications, structural analysis for postulated loads, and
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 17 of 33 material specifications commensurate with expected conditions. The concrete components subject to AMR as indicated in Table 2.1-3 are addressed in this section.
3.3.2 Environment The environment applicable to concrete components is protected from weather.
3.3.2.1 Protected From Weather Concrete within the drywell general area is located in the lower portion of the drywell and is typically exposed to ambient temperatures below 150oF and relative humidity up to 100% (Ref. 9).
Concrete protected from weather may temporarily be in contact with aggressive chemicals resulting from accidental spills. However, the resulting aging effect from accidental chemical spills is considered negligible since spills are cleaned-up quickly in accordance with plant housekeeping procedures. The drywell concrete is not exposed to an above grade or below grade environment.
3.3.3 Aging Effects The information used to determine the aging effects and associated aging mechanisms for accessible and inaccessible concrete (including subcomponents) is discussed in LRPG-06, Structural Screening and Aging Management Reviews (Ref. 13). Referring to Appendix 2 of LRPG-06 (Ref. 13), the potential aging effects and associated aging mechanisms for concrete exposed to the environments discussed above are shown in Table 3.3-1.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 18 of 33 Table 3.3-1 Summary of Potential Aging Effects For Concrete Exposed to Weather4 Aging Effect Potential Aging Mechanism Protected from Weather Above Grade Below Grade Freeze-thaw Abrasion and cavitation RC Elevated temperature RC RC RC Aggressive chemicals Loss of material Corrosion of embedded steel reinforcement Freeze-thaw Reaction with aggregates Shrinkage M
3 M
3 Settlement Elevated temperature RC,M 3
RC RC Irradiation Fatigue Restraint against expansion/contraction M
3 M
3 Aggressive environment Cracking Creep M
3 M
3 Leaching of calcium hydroxide Aggressive chemicals Elevated temperature RC RC,M 3
RC Irradiation RC,M 3
Creep M
3 Cathodic protection effect Restraints Shrinkage Change in material properties Freezing Notes:
(1) RC = reinforced concrete (2) M = masonry or block wall (3) Masonry walls are not are not applicable to the PCS.
(4) Concrete of the PCS is not exposed to this environment.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 19 of 33 3.3.3.1 Protected From Weather Loss of material, cracking, and change in material properties due to elevated temperature are not aging effects requiring management for the drywell structures concrete components. The general area temperatures in primary containment average 150°F. (Ref. 9) Concrete in the drywell is located in the lower portion, i.e. floor slab, where temperature exposure limits are below the thresholds of 150°F (Ref. 4, 17) for significant aging effects. Piping within the drywell is generally insulated and the area is cooled by local HVAC systems and not in contact with concrete surfaces.
Change in material properties due to irradiation is not an aging effect requiring management for the primary containment concrete components. The effect of radiation generated heat in the drywell has been considered in the design of the sacrificial shield walls. The shield wall thicknesses were determined on the basis of the radiation shielding requirements and are much greater than those required for structural purposes. This additional thickness, in addition to being encased by a steel liner, provides for strength greater than that required to offset radiation concerns. Additional provisions are in place to maintain a constant temperature in the area through ventilation. The ventilation within the drywell cools the area surrounding the shield walls to prevent appreciable loss of structural strength due to gamma and neutron heating.
3.3.3.2 Summary Table 3.3-2 summarizes the aging effects requiring management for the VYNPS primary containment concrete components.
Table 3.3-2 Summary of Aging Effects Requiring Management For Concrete Aging Effect Potential Aging Mechanism Protected from Weather None None No aging effects were identified which would prevent the VYNPS drywell concrete components from performing their intended functions consistent with the CLB for the period of extended operation.
Although aging effects requiring management are not expected, concrete is conservatively included in an aging management program for the period of extended operation. For accessible concrete, the structures monitoring program will provide confirmation of the absence of aging effects requiring management.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 20 of 33 3.4 Fire Barriers Per the Structural Tools (Ref. 4), fire barriers include both fire wraps and fire stops. Fire wrap refers to applied fireproofing. Fire stop refers to fireproofing used in penetrations between fire zones. Fire barriers are typically passive materials which have specific fire ratings and fire resistance ratings.
Floors, ceilings, and load bearing and non-load bearing walls made of concrete, masonry, or steel may serve as fire barriers. Fire barriers also include fire doors, fire dampers, and water curtains (Ref. 10). Fire barriers, with the exception of fire doors, fire walls, and floor slabs, are structural commodities that are common to various in-scope structures. Therefore, fire barrier commodities are evaluated in the bulk commodities AMR (Ref. 14b).
3.5 Elastomers 3.5.1 Description and Scope Elastomers are rubber or polymer having properties similar to rubber, such as neoprene and silicone. Although gaskets and seals support the functions of the components and commodities that they are associated with, they are consumable and are not subject to AMR. Other gaskets and seals, including moisture barriers, hatch seals etc. associated with components and commodities common to the primary containment structure and other in-scope structures are addressed in bulk commodities AMRC-06 (Ref. Error! Reference source not found.).
3.5.2 Environments The environment applicable to primary containment elastomer components is protected from weather.
3.5.2.1 Protected From Weather Primary containment elastomers protected from weather may be exposed to interior ambient temperature up to 148ºF and relative humidity up to 100 percent (%). Elastomers may also be subjected to ionization radiation.
3.5.3 Aging Effects 3.5.3.1 Protected From Weather Cracking and change in material properties due to ionizing radiation are applicable aging effects for elastomers for the primary containment penetrations.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 21 of 33 3.5.3.2 Summary Table 3.5-1 summarizes the aging effects requiring management for elastomers of the primary containment.
Table 3.5-1 Aging Effects Requiring Management for Elastomers Aging Effect Aging Mechanism Protected from Weather Elastomer Ionizing radiation Y
Thermal exposure Y
Cracking and Change in material properties Ultraviolet radiation Y
3.6 Flouropolymers and Lubrite Sliding Surfaces There are no structural components or commodities associated with the drywell or torus that are constructed of fluoropolymer materials such as Teflon or Tefzel. However, lubrite plate saddle assemblies are used in the torus supports at VYNPS. Lubrite is the trade name for a low friction lubricant material used in applications where relative motion (sliding) is desired. The lubrite proprietary lubricant is a custom compound mixture of metals, metal oxides, minerals, and other lubricating materials combined with a lubricating binder. Lubrite material resists deformation, has a low coefficient of friction, resists softening at elevated temperatures, absorbs grit and abrasive particles, is not susceptible to corrosion, withstands high intensities of radiation, and will not score or mar. Additionally, lubrite products are solid, permanent, completely self lubricating, and require no maintenance for the design life of the product. The lubrite lubricants used in nuclear applications are designed for the environments to which they are exposed. There are no known aging effects that would lead to a loss of intended function. Therefore, there are no aging effects requiring management for lubrite plates.
3.7 Operating Experience Industry operating experience is documented in the Structural Tools and the Mechanical Tools, EPRI reports 1002950 and 1003056, respectively (Ref. 4, 7). The review included NRC generic communications such as Information Notices, IE Bulletins and Generic Letters dating back to 1973.
The review of site specific operating experience and recent industry operating experience is documented in LRPD-05, Operating Experience Review (Ref. 14f ). The review did not identify aging effects different from those addressed in this aging management review report
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 22 of 33 4.0 Demonstration That Aging Effects Will Be Managed The aging assessment in Section 3.0 determined that some aging effects for the primary containment structural components and commodities require management. The following sections evaluate the adequacy of VYNPS programs to manage aging effects for the period of extended operation.
The aging of components in inaccessible areas is not expected to be different from that of components in accessible areas exposed to the same environments. Since inaccessible areas were determined to be no more susceptible to aging than accessible areas, no unique aging management programs are required for inaccessible areas.
The following subsections provide an overview of plant programs and activities credited for managing the effects of aging on the primary containment system and its components and commodities. More detailed program descriptions are provided in LRPD-02, Aging Management Program Evaluation Results (Ref. 14d).
4.1 Containment In-service Inspection - (CII)
For steel, the Containment In-service Inspection Program - IWE manages loss of material and cracking for the ASME Code Class MC pressure retaining steel components and their integral attachments. This aging effect will be managed by visual inspections and testing required by ASME Code,Section XI, Subsection IWE.
For additional information on the Containment In-service Inspection Program - IWE, refer to LRPD-02, Aging Management Program Evaluation Results (Ref. 14d).
4.2 In-service Inspection - (ISI)
For steel, the In-service Inspection Program - IWF manages loss of material through visual inspection and examinations for the ASME Class MC and Class 1, 2, and 3 piping supports and component supports.
For lubrite, the In-service Inspection Program provides confirmation that there are no aging effects requiring management.
For additional information on the In-service Inspection Program - IWF, refer to LRPD-02, Aging Management Program Evaluation Results (Ref. 14d).
4.3 Containment Leak Rate For steel, the Containment Leak Rate Program manages loss of material and cracking by verifying by test that PCS penetrations are effective in maintaining primary containment pressure boundary.
For additional information on containment leak rate, refer to LRPD-02, Aging Management Program Evaluation Results (Ref. 14d).
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 23 of 33 4.4 Structures Monitoring Program For the primary containment steel not covered by ASME Section XI, IWE, the structures monitoring program manages loss of material due to corrosion by visual inspection of components and their coatings.
For concrete, the structures monitoring program provides confirmation that there are no aging effects requiring management for the primary containment structure concrete.
For lubrite, the structures monitoring program provides confirmation that there are no aging effects requiring management.
For additional information on the structures monitoring program, refer to LRPD-02, Aging Management Program Evaluation Results (Ref. 14d).
4.5 Time-Limited Aging Analyses TLAA are defined in 10 CFR 54.3. An evaluation of TLAA is required by 10 CFR 54.21. Some components of the drywell and torus as identified in Attachment 1 are exposed to fatigue loading that could result in cracking. Therefore components meeting this requirement will be addressed as a TLAA.
For further discussion and conclusions regarding TLAA, refer to VYNPS Report LRPD-03, TLAA and Exemption Evaluation Results (Ref. 14e).
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 24 of 33 5.0 Summary and Conclusions In conjunction with the Structural Tools (Ref. 4), this report documents the aging management review of the primary containment structural components and commodities. Potential aging effects based on materials and environments were identified for PCS components and commodities. Based on specific materials and environments, aging effects requiring management were determined for the VYNPS primary containment structural components and commodities.
Results of the aging management review for the primary containment structural components and commodities are summarized in Attachment 1.
Programs identified in Section 4.0 will provide reasonable assurance that the effects of aging on VYNPS primary containment structural components and commodities will be managed such that the intended functions can be maintained consistent with the current licensing basis throughout the period of extended operation.
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 25 of 33 6.0 References
- 1.
Federal Register, Monday, May 8, 1995, (60 FR 22461) Final Rules, 10 CFR Part 54
- 2.
NEI 95-10, NEI 95-10 (Rev. 3), Industry Guideline for Implementing the Requirements of 10 CFR Part 54, The License Renewal Rule, April 2001.
- 3.
TR-103842, Class I Structures License Renewal Industry Report, Revision 1, EPRI
- 4.
EPRI 1002950, Aging Effects for Structures and Structural Components (Structural Tools)
Revision 1: EPRI, Palo Alto, CA: 2003
- 5.
NUREG-1801, Generic Aging Lesson Learned (GALL) Report, Revision 0, Volumes 1 and 2, July 2001
- 6.
NUREG 1557, Summary of Technical Information and Agreements from Nuclear Management and Resources Council Industry Reports Addressing License Renewal
- 7.
EPRI Report # 1003056, Non-Class 1 Mechanical Implementation Guideline and Mechanical Tools, Revision 3
- 8.
Report on Aging of Nuclear Power Plant Reinforced Concrete Structures, NUREG/CR-6424, Oak Ridge National Laboratory, March 1996
- 9.
VYNPS Updated Final Safety Analysis Report (UFSAR)
- 10. VYNPS-Fire Hazards Analysis
- 11. License Renewal Project Guideline LRPG-01, VY License Renewal Project Plan
- 12. License Renewal Project Guideline LRPG-03, System and Structure Scoping
- 13. License Renewal Project Guideline LRPG-06, Structural Screening and Aging Management Reviews
- 14. Engineering Reports:
- a. AMRC-02, Aging Management Review of the Reactor Building
- b. AMRC-06, Bulk Commodities
- c. LRPD-01, System and Structure Scoping Results
- d. LRPD-02, Aging Management Program Evaluation Results.
- e. LRPD-03, TLAA and Exemption Evaluation Results
- f.
LRPD-05, Operating Experience Review
- 15. Guide for Making a Condition Survey of Concrete in Service, ACI 201.1R-92, American Concrete Institute, Detroit, Michigan
- 16. Specifications for Structural Concrete for Buildings, ACI 301, American Concrete Institute, Detroit Michigan
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 26 of 33
- 17. Building Code Requirements for Reinforced Concrete, ACI-318-63, American Concrete Institute, Detroit, Michigan
- 18. Code Requirements for Nuclear Safety Related Concrete Structures, ACI 349-85, American Concrete Institute, Detroit, Michigan
- 20. Guide to the Use of Waterproofing, Damproofing, Protective, and Decorative Barrier Systems for Concrete, ACI 515.1R-79, American Concrete Institute, Detroit, Michigan
- 21. Prediction of Creep, Shrinkage, and Temperature Effects in Concrete Structures, ACI 209R-82, American Concrete Institute, Detroit, Michigan
- 22. Control of Cracking in Concrete Structures, ACI 224R-89, American Concrete Institute, Detroit, Michigan
- 23. Evaluation of Existing Nuclear Safety-Related Concrete Structures, ACI 349.3R-95, American Concrete Institute, Detroit, Michigan
- 24. Causes, Evaluation, and Repair of Cracks in Concrete Structures, ACI 224.1R-89, American Concrete Institute, Detroit, Michigan
- 25. ASME Boiler And Pressure Vessel Code,Section III, Division 2, Code for Concrete Reactor Vessels and Containments, 1986
- 26. ASME Boiler and Pressure Vessel Code,Section III, Nuclear Vessel, 1965
- 27. ASME Boiler and Pressure Vessel Code,Section XI, Subsection IWE and IWL, 1992 ED through 1992 Addenda
- 28. Hilsdorf, H.R., Kropp, J., and Koch, H.J., The effects of Nuclear Radiation on the Mechanical Properties of Concrete, Douglas McHenry International Symposium on Concrete and Concrete Structures, American Concrete Institute SP-55, 1978
- 29. ANSI N6.2-1965, Safety Standard for the Design, Fabrication and Maintenance of Steel Containment Structures for Stationary Nuclear Power Reactors
- 30. Specification for The Design Fabrication and Erection of Structural Steel For Buildings, American Institute of Steel Construction, 1963
- 31. Federal Register, January 7,1994, (59 FR 979), Proposal Rulemaking to Incorporate by Reference into 10 CFR 50.55a Subsection IWE and Subsection IWL,Section XI, Division I, of the ASME Boiler and Pressure Vessel Code
- 32. 10 CFR Part 50.55a, Codes and Standards
- 33. Regulatory Guide 1.163, Performance-Based Containment Leak-Test Program, U.S.
Regulatory Commission, Dated September 1995
VYNPS License Renewal Project Aging Management Review of the Primary Containment AMRC-01 Revision 0 Page 27 of 33
- 34. VYNPS Procedure:
- a. PP 7006 - Rev 7 LPC 2, Primary Containment Leakage Rate Testing Program
- b. OP 4030 - Rev 35 LPC 11, Type B and C Primary Containment Leak Rate Testing
- c. OP 4115 - Rev 43 LPC 7, Primary Containment Surveillance
- d. OP 4116 - Rev. 22 LPC 14, Secondary Containment Surveillance
- e. OP 0046 - Rev 7 LPC 1, Installation and Repair of Fire Barriers, Penetration Seals, Fire Breaks and Flood Seals
- f.
OP 4019 - Rev 15 LPC 4, Surveillance of Plant Fire Barriers and Fire Rated Assemblies
- g. PP 7015 -Rev. 3, Vermont Yankee Inservice Inspection Program
- h. PP 7024 - Rev 2, Containment Inservice Inspection Program (IWE)
- i.
PP 7030- Rev 0 LPC 1, Structures Monitoring Program Procedure
- j.
PP 7037 - Rev 0 LPC 2, Safety-Related Coatings Program
- 35. Information Notice 98-26 "Settlement Monitoring and Inspection of Plant Structures affected by Degradation of Porous Concrete Sub-foundations", July 24, 1998
- 36. ANSI B30.2-1976, Overhead and Gantry Cranes
- 37. NUREG-0612, Control of Heavy Loads at Nuclear Power Plants, January 1980
- 38. VYNPS Drawings:
- a.
G-191149R21, General Arrangement Reactor Building Plans-Sht. 1
- b.
G-191149R25, General Arrangement Reactor Building Plans-Sht. 2
- c.
G-191150R19, General Arrangement Reactor Building Sections
- d.
G-191154R2, Reactor Building Exterior Walls Mech. Penetration Seals
- e.
G-191707R6, Reactor Building Shield Wall & Trusses, Sht. 1
- f.
G-191709R5, Reactor Building Shield Wall & Trusses, Sht. 3
- g.
G-191710R2, Reactor Building Reactor Pedestal-Embedded Steel Sht. 1
- h.
5920-1578R0, Torus Penetration X-224 - X-227
- i.
5920-9132R0, Right Torus Saddle Support
- j.
5920-6042R2, Assembly of Torus Column Supports
- k.
5920-5528R0, Thermowell 5920-5525R1, RTD Details
- l.
5920-451R3, 90 Diameter Exp Bellows for Vent Line
- m.
5920-42R14, Suppression Chamber Spec Control Primary Containment Penetrations
- n.
5920-44R3, Vessel Support Arrangement
- o.
5920-45R11, Primary Containment Vessel Arrangement
- p.
5920-FS-610R1 Sht. 1, Sump Pit Liner [Drywell Eqpt and Floor Drain Sump]
- q.
6202-0200R1, Suppression Chamber General Arrangement and Field Assembly
- r.
5920-41R12, Drywell Primary Containment Penetrations
- s.
6202-23R0,Drywell Lower Beam Seats
- t.
6202-24R0,Drywell Upper Beam Seats
- u.
5920-4586R5, Drywell to Reactor Well Seal
- v.
5920-232R0, Reactor Well Seal Arrangement
VYNPS License Renewal Project Aging Management Review of Primary Containment AMRC-01 Revision 0 Page 28 of 32 Primary Containment Structural Components and Commodities Structure and/or Component/Commodity Intended Function Material Environment Aging Effect Aging Management Program GALL Item LRA Table 1 Item Notes Bellows (reactor vessel and drywell)
PB,SSR Stainless steel Protected from weather Cracking (cyclic loading)
CII-IWE Containment leak rate II.B1.1-3 (C-20) 3.5.1-13 C
CRD removal hatch EN, FLB, MB, PB,SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B4.-6 (C-16) 3.5.1-18 E
Drywell head EN, FLB, MB, PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Drywell shell EN, FLB, MB, PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Drywell shell protection panels (jet deflectors)
EN, MB Carbon steel Protected from weather Loss of material (corrosion)
Structures monitoring III.B5-7 (T-30) 3.5.1-39 C
Drywell sump liner SSR Carbon steel Exposed to fluid environment Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Drywell to torus vent line bellows PB, SSR Stainless steel Protected from weather Cracking (cyclic loading)
CII-IWE Containment leak rate II.B1.1-3 (C-20) 3.5.1-13 E
Drywell to torus vent system PB, SSR Carbon steel Protected from weather Cracking (fatigue)
TLAA II.B1.1-4 (C-21) 3.5.1-8 A
VYNPS License Renewal Project Aging Management Review of Primary Containment AMRC-01 Revision 0 Page 29 of 32 Primary Containment Structural Components and Commodities Structure and/or Component/Commodity Intended Function Material Environment Aging Effect Aging Management Program GALL Item LRA Table 1 Item Notes Drywell to torus vent system PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Equipment hatch EN, FLB, MB, PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B4-6 (C-16) 3.5.1-18 E
Personnel airlock EN, FLB, MB, PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B4-6 (C-16) 3.5.1-18 E
Primary containment electrical penetrations PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B4-1 (C-12) 3.5.1-18 E
Primary containment mechanical penetrations (includes those w/bellows)
PB, SSR Carbon steel Protected from weather Cracking (cyclic loading)
CII-IWE Containment leak rate II.B4-3 (C-14) 3.5.1-12 E
Reactor vessel support assembly SSR Carbon steel Protected from weather Loss of material (corrosion)
ISI-IWF III.B1.1-13 (T-24) 3.5.1-53 E
Reactor vessel stabilizer supports SSR Carbon steel Protected from weather Loss of material (corrosion)
ISI-IWF III.B1.1-13 (T-24) 3.5.1-53 E
Sacrificial shield wall lateral supports EN, MB, SSR Carbon steel Protected from weather Loss of material (corrosion)
Structures monitoring II.B5-7 (T-30) 3.5.1-39 C
VYNPS License Renewal Project Aging Management Review of Primary Containment AMRC-01 Revision 0 Page 30 of 32 Primary Containment Structural Components and Commodities Structure and/or Component/Commodity Intended Function Material Environment Aging Effect Aging Management Program GALL Item LRA Table 1 Item Notes Sacrificial shield wall (steel portion)
EN, MB, SSR Carbon steel Protected from weather Loss of material (corrosion)
Structures monitoring II.B5-7 (T-30) 3.5.1-39 C
Structural steel: plate, columns and beams SSR Carbon steel Protected from weather Loss of material (corrosion)
Structures monitoring II.B5-7 (T-30) 3.5.1-39 C
Torus electrical penetrations PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B4-1 (C-12) 3.5.1-18 E
Torus external supports (columns, saddles)
SSR Carbon steel Protected from weather Loss of material (corrosion)
ISI-IWF III.B1.1-13 (T-24) 3.5.1-53 E
Torus manway PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Torus mechanical penetrations PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B4-1 (C-12) 3.5.1-18 E
Torus ring girder SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Torus ring girder SSR Carbon steel Exposed to fluid environment Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
VYNPS License Renewal Project Aging Management Review of Primary Containment AMRC-01 Revision 0 Page 31 of 32 Primary Containment Structural Components and Commodities Structure and/or Component/Commodity Intended Function Material Environment Aging Effect Aging Management Program GALL Item LRA Table 1 Item Notes Torus shell HS, PB, SSR, Carbon steel Protected from weather Cracking (fatigue)
TLAA II.B1.1-4 (C-21) 3.5.1-8 E
Torus shell HS, PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Torus shell HS, PB, SSR Carbon steel Exposed to fluid environment Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Torus thermowells PB, SSR Carbon steel Protected from weather Loss of material (corrosion)
CII-IWE Containment leak rate II.B1.1-2 (C-19) 3.5.1-5 E
Vent header support SSR Carbon steel Exposed to fluid environment Loss of material (corrosion)
ISI-IWF III.B1.1-13 (T-24) 3.5.1-53 E
Drywell sumps SSR Concrete Protected from weather NA Structures monitoring NA I, 501 Equipment hatch concrete plug EN, MB, SSR Concrete Protected from weather NA Structures monitoring NA I, 501 floor slabs, walls EN, FLB, MB, SSR Concrete Protected from weather NA Structures monitoring NA I, 501 Foundation EN, FLB, MB, PB, SSR Concrete Protected from weather NA Structures monitoring NA I, 501 Reactor vessel support pedestal SSR Concrete Protected from weather NA Structures monitoring NA I, 501
VYNPS License Renewal Project Aging Management Review of Primary Containment AMRC-01 Revision 0 Page 32 of 32 Primary Containment Structural Components and Commodities Structure and/or Component/Commodity Intended Function Material Environment Aging Effect Aging Management Program GALL Item LRA Table 1 Item Notes Sacrificial shield wall (concrete portion)
EN, MB, SSR Concrete Protected from weather NA Structures monitoring NA I, 501 Drywell floor liner seal EN, SSR Elastomer Protected from weather Cracking Change in material properties Structures monitoring II.B4-7 (C-18) 3.5.1-16 E
Primary containment electrical penetration sealant PB, SSR Elastomer Protected from weather Cracking Change in material properties Structures monitoring II.B4-7 (C-18) 3.5.1-16 E
Lubrite sliding supports SSR Lubrite Protected from weather NA ISI-IWF Structures monitoring NA I, 501
VYNPS License Renewal Project Aging Management Review of Primary Containment AMRC-01 Revision 0 Page 33 of 32 Primary Containment Structure Structural Components and Commodities - Notes Notes: (all listed notes may not be applicable)
A. Consistent with component, material, environment, aging effect and aging management program listed for NUREG-1801 line item. AMP is consistent with NUREG-1801 AMP description.
B. Consistent with component, material, environment, aging effect and aging management program listed for NUREG-1801 line item. AMP has exceptions to NUREG-1801 AMP description.
C. Component is different, but consistent with material, environment, aging effect and aging management program listed for NUREG-1801 line item. AMP is consistent with NUREG-1801 AMP description..
D. Component is different, but consistent with material, environment, aging effect and aging management program listed for NUREG-1801 line item. AMP has exceptions to NUREG-1801 AMP description.
E. Consistent with NUREG-1801 material, environment, and aging effect but a different aging management program is credited.
F. Material not in NUREG-1801 for this component.
G. Environment not in NUREG-1801 for this component and material.
H. Aging effect not in NUREG-1801 for this component, material and environment combination.
I.
Aging effect in NUREG-1801 for this component, material and environment combination is not applicable.
J. Neither the component nor the material and environment combination is evaluated in NUREG-1801.
Plant Specific Note:
501. The VYNPS environment is not conducive to the listed aging effects. However, the identified AMP will be used to confirm the absence of significant aging effects for the period of extended operation.
502. Loss of insulating characteristics due to insulation degradation is not an aging effect requiring management for insulation material. Insulation products, which are made from fiberglass fiber, calcium silicate, stainless steel, and similar materials, that are protected from weather do not experience aging effects that would significantly degrade their ability to insulate as designed. A review of site operating experience identified no aging effects for insulation used at VYNPS.
503. The ambient environment at VYNPS is not chemically polluted by vapors of sulfur dioxide or other similar substances and the external environment does not contain saltwater or high chloride content. Therefore aging management is not required for aluminum, stainless steel and galvanized steel components exposed to the external environment.
504. Steel piles driven in undisturbed soils show no significant effects due to corrosion, regardless of the soil type or soil properties. Likewise, piles driven in disturbed soil above the water table zone do not reflect any significant corrosion. Therefore aging management is not required