ML20207K490
| ML20207K490 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 03/11/1999 |
| From: | Cruse C BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9903170210 | |
| Download: ML20207K490 (28) | |
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CHARLES IL CRUSE Baltimore Gas and Electric Company Vice President Calvert Cliffs Nuclear Power Plant Nuclear Energy 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 495-4455 March 11,1999 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Revision I for License Renewal Application Section 6.2, Electrical Commodities
REFERENCES:
(a)
Letter from Mr. C.11. Cruse (BGE) to NRC Document Control Desk, dated April 8,1998," Application for License Renewal" (b)
Letter from Mr. C. II. Cruse (BGE) to NRC Document Control Desk, dated February 4,1999, " Changes to the Application for License Renewal" 7
o Reference (a) forwarded Baltimore Gas and Electric Company's (BGE's) license renewal application (LRA) for Calvert Cliffs Nuclear Power Plant Units I and 2. Reference (b) forwarded changes to the Integrated Plant Assessment (IPA) results and errata to the BGE LRA, including an overview of several " Dh, planned changes to Chapter 6.2 of the BGE LRA," Electrical Commodities."
This letter forwards Revision 1 of Chapter 6.2, as Attachment-(l). This chapter has been substantially revised, and Attachment (1) is submitted as a complete replacement for the existing Chapter 6.2. Due to the increased number of repetitive and redundant inspection tasks now credited for Electrical Commodities, BGE has written Revision 1 in a more concise format.
This submittal should be considered an amendment to the BGE LRA. The annual amendment to the BGE LRA required by 10 CFR 54.21(b)is planned for April 1999.
9903170210'990311 PDR ADOCK 05000317 p
PDR L
Docum nt Control Desk March 11,1999 Page 2 Should you have further questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours,
-/
STATE OF MARYLAND
- TO WIT:
COUNTY OF CALVERT I, Charles 11. Cruse, being duly sworn, state that I am Vice President, Nuclear Energy Division, Baltimore Gas and Electric Company (BGE), and that I am duly authorized to execute and file this
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response on behalf of BGE. To the best of my knowledge and belief, the statements contained in this document are true and correct. To the extent that these statements are not based on my personal knowledge, they are based upon information provided by other BGE employees and/or consultants. Such information has been reviewed in accordance with company practice and I believe it be reliable.
f i
Subscribed 9nd sworn before me, a Notary Public in nd for the State of Maryland and County of
[4 81J/A fl
, this //
dayof 4VllAL
,1999.
WITNESS my lland and Notarial Seal:
Mh litlA A
Notary Public i
My Commission Expires:
I;%(TO1 Date CliC/JMO/ dim
Attachment:
(1) Appendix A - Technical Information; 6.2 - Electrical Commodities, Revision 1 cc:
R. S. Fleishman, Esquire C. I. Grimes, NRC J. E. Silberg, Esquire D. L. Solorio, NRC S. S. Bajwa, NRC Resident Inspector,NRC A. W. Dromerick, NRC R. I. McLean, DNR II. J. Miller, NRC J. II. Walter, PSC f
.z.
ATTACHMENT m APPENDIX A - TECHNICAL INFORMATION 6.2 - ELECTRICAL COMMODITIES, REVISION 1 i
Baltimore Gas and Electric Company Calvert Cliffs Nuclear Power Plant March 11,1999
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ATTACHMENT (1)
APPENDIX A - TECIINICAL INFORMATION; i
6.2 - ELECTRICAL COMMODITIES l
6.2 Electrical Commodities This is a section of the Baltimore Gas and Electric Company (BGE) License Renewal Application (LRA), addressing Electrical Commodities (ECs), which have been evaluated in accordance with the l
Calvert Cliffs Nuclear Power Plant (CCNPP) Integrated Plant Assessment (IPA) Methodology described in Section 2.0 of the BGE LRA. These sections are prepared independently and will, collectively, comprise the entire LRA.
6.2.1 Scoping 6.2.1.1 Electrical Commodities Scoping Electrical components are associated with most plant systems. The scoping process, performed separately for each system within the scope of license renewal, identified passive electrical structural enclosures / supports (e.g., panels, racks, etc.) from 26 systems that were included in the Electrical i
Commodities Evaluation (ECE). Since the component materials and environments are common to i
numerous systems, it was determined that a commodity evaluation approach would be more efficient rather than evaluating these ECs in each system aging management review (AMR). [ Reference 1, Sections 1.1)
Representative historical operating experience pertinent to aging is included in appropriate areas to
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provide insight supporting the aging management demonstrations. This operating experience was obtained through keyword searches of BGE's electronic database of information on the CCNPP dockets and through documented discussions with currently assigned cognizant CCNPP personnel.
Commodity Descriotion/Concentual Boundaries Electrical commodities are within the scope oflicense renewal because they support and protect various plant electrical components that are required to perform the functions described in 10 CFR 54.4(a)(1),
(2), and (3). As discussed in Section 5.0 of the CCNPP IPA Methodology, system components are assigned to the scope of the ECE during the system pre-evaluation process. As a result of that process, several types of passive, long-lived electrical components were considered ECs. These components i
typically were either conductive equipment (such as distribution buses) or panels / cabinets, which support and/or protect safety-related electrical equipment and terminal blocks. Cables were excluded from this evaluation and have been addressed in the Cables Commodity Evaluation in Section 6.1 of the BGE LRA. Panel wiring is discussed separately in this section. The ECE is composed of the following structural enclosures for electrical equipment, which provide support and/or protection of the electrical equipment within them: (Reference 1, Section 1.2.2]
Miscellaneous panels; Motor control center (MCC) cabinets; j
e Switchgear/ disconnect cabinets; e
Bus cabinets; Circuit breaker cabinets; e
Local control stations panels; e
Battery terminals and charger cabinets; and e
e Inverter cabinets.
Application for License Renewal 6.2-1 Calvert Cliffs Nuclear Power Plant Revision 1 J
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ATTACHMENT (1)
APPENDIX A - TECI'NICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES i
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The supporting cabinets and panels of the identined equipment above are evaluated in this report along with terminal blocks and other structural subcomponents of these enclosures. Most of the supporting panels and cabinets covered by this report are identified by the name of the equipment they support because they do not have their own unique equipment identifiers. The panels are included here as a device type because some of the panels do have unique equipment identifiers. Terminal blocks attached i
to the cabinets are used for the termination of electrical connections. These blocks are considered to be part of the cabinets or panels that house them and are included in this evaluation. They are phenolic material subject to the effect of electrical stressors.
Electrical commodities are assigned to a number of systems in the CCNFP equipment database because they are functionally related to the system components. In all cases, the passive intended function of such ECs equipment is to provide structural support to active system components contained in this equipment, and/or to ensure electrical continuity of power, control, or instrumentation signals. The i
conceptual boundaries for the ECs include panels rad the enclosures / supports (i.e., cabinets, etc.) for MCCs, switchgears, buses, disconnect switches / links, local control stations, batteries, chargers, and t
inverters for the systems shown in Table 6.2-1. The CCNPP system numbers and the applicable BGE LRA sections for the systems are also shown in the table. [ Reference 1, Section 3.0]
The design basis and associated loading conditions for the CCNPP electrical systems (which include ECs) are described in Updated Final Safety Analysis Report Section 8.1.1. All ECs vital to plant safety are designated as Class IE so that their integrity is not impaired by a Safe Shutdown Earthquake, high
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winds, or disturbances in the external electrical system. [ Reference 2, Section 8.1.1]
Ooerating Exnerience I
The following historical operating experience is included to provide insight in supporting the aging management demonstrations provided in Section 6.2.2 of this report.
The ECs are usually not subject to extreme conditions or excessive loads; however, some CCNPP ECs are subject to corrosive environments. For example, there have been EC components that have been rusted and corroded due to exposure to saltwater spray. [ Reference 3] Other instances of corrosion have occurred in the Nos. II A and B traveling screen control panels. Though these panels are not within the scope of license renewal, they are made of materials and exposed to environments similar to panels within the scope oflicense renewal addressed in this report. The. legs of these panels were corroded due to exposure to the atmosphere and were replaced with stainless steel support legs.
The cathodic protection system panels for the intake structure baffle walls experienced corrosion and have been replaced with new, upgraded panels made of fiber reinforced plastic. Though the cathodic protection system baffle walls are not within the scope license renewal, they are made of materials and exposed to environments similar to panels within the scope of license renewal addressed in this report.
Any panel onsite that is either outside or subject to salty air or high humidity could be subject to external 4
corrosion, and corrosion product buildup on contacts or terminations if panel door and penetration seals
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leak.
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i Application for License Renewal 6.2-2 Calvert Cliffs Nuclear Power Plant Revision 1
,O ATTACHMENT m APPENDIX A - TECliNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES The discovery of these anomalies and the actions taken subsequent to discovery demonstrates that 3
CCNPP inspects and maintains the ECs subject to harsh environments to ensure that these components remain capable of performing their intended function (s) under current licensing basis (CLB) conditions.
TABLE 6.2-1 SYSTEMS CONTAINING ELECTRICAL PANELS WITHIN THE SCOPE OFTHE ELECTRICAL COMMODITIES EVALUATION System
. BGE LRA System Name --
Number Section 3
002 Electrical 125 VDC Distribution 004 Electrical 4 kV Transformers and Bues 005 Electrical 4J0V Transformers and Buses 006 Electrical 480V MCCs
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011 Service Water 5.17 012 Saltwater 5.16 013 Fire Protection 5.10 017 Instrument AC (alternating current) 018 VitalInstrument AC 019 Compressed Air 5.4 020 Data Acquisition 024 Emergency Diesel Generators 5.8 030 Control Room Heating, Ventilation, and Air Conditioning (HVAC) 5.11.C 032 Auxiliary Building and Radwaste Heating and Ventilation 5.11.A 036 Auxiliary Feedwater 5.1 1
038 Nuclear Steam Supply System Sampling 5.13 048 Engineered Safety Feature Actuation 052 Safety Injection 5.15
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058 Reactor Protective 060 Containment Heating and Ventilation 5.11.B 062 Control Boards 073 Hydrogen Recombiners 074 Nitrogen and Hydrogen Gas 078 Nuclear Instrumentation 079 Radiation Monitoring 5.14 094 Plant Computer 097 Lighting and Power Receptacle 103 Diesel Generator Building HVAC 5.11C Sconed Structures and Comoonents and Their Intended Functions The conceptual boundaries for the ECs include the panels and enclosures / supports (i.e., cabinets, etc.) for MCCs, circuit breakers, switchgear, buses, local control stations, disconnect switch / links, battery terminals, chargers, and inverters as described above for the systems shown in Table 6.2-1. All of these i
panels and enclosures / supports perform passive intended functions and are subject to AMR. Active electrical devices are explicitly excluded from AMR based on 54.21(a)(1)(i). Based on the discussion Application for License Renewal 6.2-3 Calvert Cliffs Nuclear Power Plant Revision 1
N A'ITACHMENT (1)
APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES in Section 4.1.1 of the CCNPP IPA Methodology, ECs that perform the following passive intended functions are within the scope oflicense renewal based on 54.4(a)(1) and {54.4(a)(2): [ Reference 1, Section 1.2.3, 3.1, 3.2]
To maintain electrical continuity and/or provide protection of the electrical system; and To provide seismic integrity and/or protection of safety-related compor.ents.
Based on the above, the EC components that support passive functions and that are long-lived are subject to AMR. The EC enclosure device types that are subject to an AMR are listed in Table 6.2-2.
[ Reference 1, Sections 3, Table 3-1] The device types in Table 6.2-2 are used to identify the panels and I
cabinets (subject to AMR in the ECE) that might not have a unique equipment identification number in the equipment database.
The aging of non-metallies used in electrical cabinets is discussed below. Non-metallic subcomponents in electrical cabinets and panels fall into one of three categories.
Subcomnonent Category 1: Subcomnonent of Active Device - Excluded from AMR The first category includes subcomponents of active electrical devices such as Teflon-coated sleeve bearings, polyester glass are chutes, and polyester glass bus stand-off insulators used in 480 VAC circuit breakers. Active devices are excluded from the requirement for an AMR.
Subcomnonent Category 2: Conductor Insulation - Subject to AMR The second category includes the organic insulation of wiring or buswork. For example, crosslinked polyethylene insulated wiring is used in the 4 kV switchgear cabinets, 480 VAC load centers, and 480 VAC MCCs. The internal operating temperatures for insulated connections in 4 kV switchgear cabinets and 480 VAC load centers is limited to 70 Centigrade (C) based on an ambient temperature of 40C per American National Standards Institute / Institute of Electrical and Electronic Engineers C37.20.2 - 1987. This is more than 10C below the 60-year service limiting temperatures for polyolefin and ethylene propylene rubber materials. Therefore, thermal aging is not plausible for the wiring contained in the 4 kV switchgear cabinets or the 480 VAC load centers. Internal operating temperatures in 480 VAC MCCs can approach 60-year service limits for polyolefin insulated wiring.
Therefore, thermal aging is plausible for polyolefin insulated wiring in 480 VAC MCCs and will require aging management. This wiring will be included in the cables aging management program discussed in Section 6.1, Cables, of the BGE LRA. Organically insulated control panel wiring is not subject to plausible thermal aging since operating temperatures in this service are well below 60-year service limiting temperatures for any organic insulating material, except polyvinyl chloride (PVC),
which is not used in this service. This category of subcomponents subject to aging applies to the 480 VAC MCCs of Group 5.
The bus splices in 4 kV switchgear cabinets are insulated with PVC boots. The operating temperature of the PVC boots is within SC of ambient. However, PVC is sensitive to thermal aging even at relatively low temperatures. Failure of air conditioning for an extended period of time could impact these boots. Therefore, thermal aging is plausible for the PVC boots in 4 kV switchgear cabinets and will require aging management. The aging of buswork insulation applies to the 4 kV switchgear cabinets in Group 3. These boots will be included in the cables aging management program discussed in Section 6.1, Cables, of the BGE LRA.
Application for Licene Renewal 6.2-4 Calvert Clifts Nuclear Power Plant Revicion 1
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APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES Subcomnonent Category 3: Subcomnonent of Panel-Subject to AMR The third category includes subcomponents of the housing / cabinet such as insulating stand-off supports. Such subcomponents provide structural support for buswork and active ungrounded devices contained in the housing / cabinets. These subcomponents are subject to plausible aging if certain elastomers are used. They are not subject to plausible aging if a thermoset or thermoplastic material is used.
For example, polyester-glass is used to support and insulate the buswork in the 4 kV switchgear cabinets,480 VAC load centers, and 480 VAC MCCs. However, polyester-glass is not subject to plausible aging. Elastomers, other than silicone rubber, used to insulate and support ungrounded devices are subject to plausible embrittlement and loss of insulation resistance due to thermal aging. Such aging could result in failure of the support under seismic loading or short circuit forces. The critical characteristic is the loss of flexibility since changes in mechanical properties typically precede changes in electrical properties for insulating elastomers. The 125 VDC chargers, inverters, and power distribution panels of Group 3 and Group 7 will be examined to explicitly identify any such elastomeric insulating supports. These supports will be explicitly included in the Age-Related Degradation Inspection (ARDI) Program or the existing " clean and inspect" Preventive Maintenance (PM) Procedure. Then, the PM or ARDI will be adjusted to monitor the support for the discovery ofloss of flexibility. There are other non-metallic subcomponents of the panels that do not have a license renewal function. These subcomponents include dust shields and wiring penetration
' sleeves.
Terminal blocks are also considered to be subcomponents of the housing / cabinets. They are hard plastic, typically phenolic material, and are not subject to plausible thermal aging due to exposure to normal ambient temperatures. However, they are subject to electrical stress. The plausible aging identified with this stressor is the ohmic heating effects brought about by increased termination resistance associated with loosened connections. This aging effect and the management of it is addressed explbitly in this report. All groups of panels contain terminal blocks subject to electrical stressor aging.
Application for License Renewal 6.2-5 Calvert Cliffs Nuclear Power Plant Revision 1
NITACIIMl'NT (1)
APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES TABLE 6.2-2 DEVICE TYPE WITIIIN TIIE SCOPE OF LICENSE RENEWAL FOR TILE ELECTRICAL COMMODITIES EVALUATION Device Type Component Supported and/or Typical Associated EC Protected for Support / Protection BATT Batteries Terminals BKR Circuit Breakers Cabinet BUS Electrical Buses Cabinet CilGR Chargers Cabinet INV Inverters Cabinet MCC MCCs Cabinet NA 4 kV Local Control Stations Panel NB 480V Local Control Stations Panel ND 125/250 VDC Local Control Stations Panel NY Instrument Air Containment isolation Panel Local Control Station PNL Panel Panels 6.2.2 Aging Management The potential age-related degradation mechanisms (ARDMs) for the EC components are listed in Table 6.2-3. The plausible ARDMs are identified in the table by a check mark (/) in the apprrpriate column. The device types listed in Table 6.2-3 are those previously identified in Table 6.2-2 as passive and long-lived. For efficiency in presenting the results of these evaluations in this report, the components here are grouped together based on device types. [ Reference 1, Section 4.4] The groups addressed are:
Group 1 - Battery Terminals / Charger and Inverter Cabinets (electrical stressors, general corrosion, and wear);
Group 2 - Breaker Cabinets (electrical stressors, wear, and fatigue);
e Group 3 - Bus Cabinets (electrical stressors, wear, and fatigue);
e Group 4 - MCC Panels (electrical stressors, wear, fatigue, and dynamic loading);
e Group 5 - Local Control Station Panels (electrical stressors, wear, fatigue, and general e
corrosion); and Group 6 - Miscellaneous Panels (electrical stressors, wear, fatigue, and dynamic loading).
e The following is a discussion of the aging management demonstration process for each group identified above. It is presented by groups and includes a discussion of materials and environment, aging mechanism effects, methods to manage aging, aging management program (s), and aging management demonstration.
The clean and inspect PM procedun.s (as opposed to testing PMs) cover most of the electrical panels at CCNPP from 4 kV down to 125 VDC. liowever, some of the lower voltage electrical panels are not covered by clean and inspect PMs even if they are subject to testing PMs. Repetitive tasks will be developed for these electrical panels to inspect for signs of age-related degradation.
Application for License Renewal 6.2-6 Calvert Cliffs Nuclear Power Plant Revision 1
ATTACHMENT (1)
APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES 2
TABLE 6.2-3 POTENTIAL PLAUSIBLE ARDMs
' Enclosures for Support and/or Protection of Electrical Commodities Device Types Potential BATI BKR BUS CHGR INV MCC NA NB ND NY PNL ARDMs tenninal cabinet cabinet cabinet cabinet panel penet panel panel penet Corrosion Fatigue j
Crevice Corrosion Dynamic Loadmg
/(4)
/(6)
(1)
Electrical
/(2)
/(3)
/(1)
/(1)
/(4)
((5)
/(5)
/(5)
/(5)
/(6) stressors (2)
Erosion Corrosion 1'atigue (1)
/(2)
/(3)
/(4)
/(5)
/(6) fretting General Corrosion
/(1)
/(5) l{ydrogen Damage Intergranular Attack Microbiologically
-Induced Corrosion Neutron Embrittlement Oxidation Pitting Saline Water Attack Shrinkage / Creep Stress Corrosion Cracking 1hermal Embrittlement Uniform Attack Wear
/(2)
/(3)
/(1)
/(1)
/(4)
/(5)
/(5)
/(5)
/(5)
/(6)
Note 1: Dynamic loading and fatigue are plausible for some but not all components associated with the indicated device type. Reference I contains the detail for the plausibility of these aging mechanisms for each individual component.
Note 2: Electrical stressors applies to phenolic terminal blobks.
Group 1 (battery terminals / charger and inverter cabinets)- Materials and Environment As Table 6.2-3 shows, the battery terminals are subject to corrosion, while the charger and inverter cabinets and associated terminal blocks are susceptible to the effects of electrical stressors and wear.
His group consists of the components for the 125 VDC Electrical Distribution System. The battery terminals are made of aluminum, lead, and copper, while the charger and inverter cabinets are constructed from carbon steel.
[ Reference 1, Attachment 1, BATf-01, CHGR-01, INV-01, Attachments 2,5]
Application for License Renewal 6.2-7 Calvert Cliffs Nuclear Power Plant Revision 1
"l ATTACHMENT (1)
APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES The environment that the battery terminals / charger and inverter cabinets experience is that of a mild controlled atmosphere within the CCNPP Auxiliary Building. The ECs in this group are subject to operational and maintenance activities. Terminal blocks attached to the cabinets are used for the termination of electrical connections. These blocks are considered to be part of the cabinets that house them and are included in this evaluation. They are phenol'c material subject to the effects of electrical stressors. The battery terminals are subject to the potent.:.!Iy corrosive environment of battery acid.
[ Reference 1, BATT-01, CHGR-01, INV-01, Attachments 5,6]
l Group 1 (battery terminals / charger and inverter cabinets)- Aging Mechanism Effects Electrical stressors (e.g., local ohmic heating) occur most commonly as a result of loose or improper terminations, which result in the degradation of organic materials and terminal block hardware. Loose terminations can occur as a result of the operation of panel components, as well as non-seismic vibration produced externally to the electrical components, which causes connections and terminals to loosen.
Degradation of organic material can occur as ohmic heating and elevated ambient temperatures cause terminal blocks to degrade. Terminal blocks are generally made of organic material that may lose its mechanical integrity (e.g., cracking and embrittlement may cause loss of support and insulating capabilities). [ Reference 1, Attachment 7s] The terminal blocks are subject to the above conditions and are, therefore, susceptible to the aging effects of electrical stressors.
Wear results from relative motion between two surfaces and from small, vibratory or sliding motions under the influence of a corrosive environment (fretting). Cabinet components, such as door hinges and circuit breaker racking mechanisms and other sliding parts, can wear from repeated openings for 1
maintenance and testing. [ Reference 1, Attachments 6,7] Therefore, wear was determined to be plausible for the charger and inverter cabinets for which aging effects must be managed during the period of extended operation.
General corrosion is the thinning (wastage) of a metal by chemical attack (dissolution) at the surface by an aggressive environment. The consequences of the damage are the loss of load carrying cross-sectional area of the metal. General corrosion requires an aggressive environment. An important concern for pressurized water reactors is the attack of boric acid on carbon steels. Borated water has been observed to leak from piping, valves, storage tanks, etc., and fall on other steel components and
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attack the component from the outside. In addition, systems that contain saltwater can also leak and corrode carbon steel components. Acid leakage from station batteries can result in the corrosion of
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battery terminals. Therefore, general corrosion was determined to be plausible for the 125 VDC battery terminals. [ Reference 1,NB-01, Attachments 6,7]
If unmanaged, these ARDMs could eventually result in the loss of seismic support capability and electrical continuity under CLB design loading conditions.
Group 1 (battery terminals / charger and inverter cabinets)- Methods to Manage Aging Mhigation: There are no feasible ways of preventing electrical stressors on the terminal blocks in battery charger and inverter cabinets other than through proper installation and maintenance. 'Ihere are also no feasible ways of preventing wear on cabinet components other than not operating the associated equipment; therefore, there are no practical means of preventing wear from occurring. In addition, there are also no feasible ways of preventing general corrosion of battery terminals other than proper maintenance.
Application for License Renewal 6.2-8 Calvert Cliffs Nuclear Power Plant Revision I
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ATTACHMENT m APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES Discoverv: The effects of these ARDMs are detectable by visual techniques. Inclusion of the battery racks, charger and inverter cabinets in regular maintenance / overhaul inspections of these components under maintenance / overhaul / inspection repetitive tasks would result in the discovery of signs of these ARDMs.
Group I (battery terminals / charger and inverter cabinets)- Aging Management Program (s)
Mitigation: There are no CCNPP programs credited with the mitigation of electrical stressors, general corrosion, or wear on the battery terminals / charger and inverter cabinets and associated terminal blocks.
Discoverv: The CCNPP PM Program is credited for the discovery of electrical stressors, general corrosion, and wear of the battery terminals / charger and inverter cabinets and associated terminal blocks.
This program is described below.
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l Calvert Cliffs PM Program The CCNPP PM Program has been established to maintain plant equipment, structures, systems, and components in a reliable condition for normal operation and emergency use, minimize equipment failure, and extend equipment and plant life. [ Reference 4, Section 1.1]
l The program is governed by CCNPP Administrative Procedure MN-1-102, " Preventive Maintenance Program," and covers all PM activities for nuclear power plant structures and equipment within the plant, including the ECE structural components (i.e., panels, etc.) within the scope of license renewal.
Guidelines drawn from industiv experience and utility best practices were used in the development and enhancement of this program.
I The PM Program includes periodic inspection of specific components through various maintenance activities. These activities provide an effective means to discover and manage the age-related degradation effects on these components. The program requires that an Issue Report be initiated according to CCNPP Procedure QL-2-100, " Issue Reporting and Assessment," for deficiencies noted during performance of PM tasks. Corrective actions are taken to ensure that the affected components remain capable of performing their passive intended functions under all CLB conditions. [ Reference 4, Section 5.2.B.I.fj The PM Program has had numerous levels of management review, all the way down to the specific implementation procedures. Specific responsibilities are assigned for evaluating and upgrading the PM Program and for initiating program improvements based on system performance. Issue Reports are initiated according to CCNPP Procedure QL-2-100 to request changes to the program that could improve or correct plant reliability and performance. Changes to the PM Program that require Issue Reports 1
included changes to the PM task scope, frequency, process changes, results from operating experience reviews, as well as other types of changes. [ Reference 4, Sections 5.1.A and 5.4] The PM Program also has undergone periodic evaluation by the NRC as part of their routine licensee assessment activities.
[ Reference 5]
Under the PM Program, electrical stressors and wear (and fatigue, dynamic loading, and general corrosion for other groups in this report) of the EC components are managed through existing PM.
[ Reference 1, Attachment 1] There are currently six CCNPP PM repetitive tasks that are credited with Application for License Renewal 6.2-9 Calvert Cliffs Nuclear Power Plant Revision 1
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ATTACHMENT m APPENDIX A - TECliNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES the discovery of the effects of general corrosion on the indicated 125 VDC battery terminals. These repetitive tasks reference other procedures to test and inspect the batteries and their terminals. Guidance to examine for the effects of plausible ARDMs will be provided when these repetitive tasks are executed.
Each of these repetitive tasks is currently performed every 12 weeks. [ Reference 1, Attachment h Reference 6]
Repetitive tasks are credited for discovery of electrical stressors and wear on the (11) battery charger cabinets in the scope of license renewal. Ten existing repetitive tasks direct the user to clean, inspect, and calibrate the chargers. Guidance to examine for the effects of plausible ARDMs will be provided j
when these repetitive tasks are executed. These repetitive tasks are currently performed every 96 weeks.
[ Reference 1, Tables 5-1,5-2,5-3; Reference 6] One additional repetitive task is to be developed.
Eight additional repetitive tasks will di3 cover wear and electrical stressors on the inverter cabinets.
These repetitive tasks direct the user to inspect the inverter cabinets and calibrate the meters. Guidance to examine for the effects of pLusible ARDMs will be provided when these repetitive tasks are executed.
These repetitive tasks are currently performed every 96 weeks. [ Reference 1, Table 5-1, Table 5-3, Reference 6]
For all of the repetitive tasks discussed, any evidence of these ARDMs will initiate corrective action.
i Any corrective ac: ions that are required during these inspections are performed in accordance with the CCNPP Corrective Actions Program, and will ensure that the battery terminals / charger and inverter cabinets will remain capable of performing their intended function under all CLB conditions.
Group 1 (battery ter minals/ charger and inverter cabinets)- Demonstration of Aging Management Bara on the information presented above, the following conclusions can be reached with respect to the j
12, VDC battery terminals, charger and inverter cabinets:
The 125 VDC battery terminals, charger and inverter cabinets, and associated terminal blocks, e
have the intended functions of maintaining the seismic integrity and/or protection of safety-related components and electrical continuity under CLB design conditions.
Electrical stressors. reneral corrosion, and wear are plausible for the 125 VDC hattery terminals, i
charger and inverter cabmets, and associated terminal blocks, which could lead to loss of seismic integrity and/or protection of safety-related components and electrical continuity under CLB design conditions.
The CCNPP PM Program will provide for the discovery of the aging effects of electrical j
stressors, wear, and genera; corrosion that may be of concern for the 125 VDC battery terminals, charger and inverter cabinets using repetitive tasks. The repetitive tasks will be modified to I
include these ARDMs where they are not presently included, and additional specified coraponents where they are not presently inspected. Inspections will be performed and appropriate corrective action will be taken where any of these ARDMs are discovered.
Therefc.e. there is reasonable assurance that the effects of these ARDMs on the 125 VDC battery terminals, charger and inverter cabinets will be adequately managed to maintain their intended function under all design loadings required by the CLB during the period of extended operation.
Application for License Renewal 6.2-10 Calvert Cliffs Nuclear Power Plant Revision 1 m.
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ATTACHMENT m l
APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES Group 2 (breaker cabinets)- Materials and Environment i
As Table 6.2-3 shows, breaker cabinets and associated terminal blocks are susceptible to the effects of electrical stressors, fatigue, and wear. This group consists of the Reactor Protective System (RPS) trip switchgear cabinets, which are made of carbon steel.
[ Reference 1, Attachment 1, BKR-01, l
Attachments 2,5]
The environment that the RPS trip switchgear cabinets experience is that of a mild controlled atmospnere l
within the CCNPP Auxiliary Building. These switchgear cabinets are subject to operational and maintenance activities. Terminal blocks attached to the cabinets are used for the termination of electrical connections. These blocks are considered to be pert of the cabinets that house them and are included in this evaluation. They are phenolic material subject to the effects of electrical stressors. [ Reference 1, BKR-01, Attachments 5,6]
Group 2 (breaker cabinets)- Aging Mechanism Effects The effects of electrical stressors and wear were previously discussed in Group 1 (battery terminals / charger and inverter cabinets) under the Aging Mechanisms Effect section. The RPS trip switchgear cabincts are subject to the conditions described in the Group 1 Aging Mechanism Effects l
section and are, therefore, susceptible to the aging effects of these ARDMs.
Fatigue damage results from progessive, localized structural change in materials subjected to fluctuating stresses and strains. Associated failures may occur at either high or low cycles in response to various i
kinds of loads (e.g., mechanical or vibrational loads, thermal loads, or pressure cycles). Fatigue cracks initim and propagate in regions of stress concentration that intensify strain. The fatigue life of a coy w x is a function of several variables, such as stress level, stress state, cyclic wave form, endrew and the metallurgical condition of the material. Failure occurs when the endurance limit nutia. rycles (for a given load amplitude) is exceeded. All materials are susceptible (with varying endura ilmits) when subjected to cyclic loading. [ Reference 1, Attachment 7s]
Fatigue typically occurs in s,vitengear cabinets fro >n low-level vibrational loading of electrical equipment (e.g.,reirys, contactors, transformers, etc.) induced by AC hum or from mechanical operation. Mechanical stresses can cause housing welds to crack. [ Reference 1, Attachments 6,7]
Therefore, faigue was also determined to be plausible for the RPS trip switchgear cabinets for which ging effects must be managed during the period of extended operation.
If unmanaged, these ARDMs could eventually result in the loss of seismic support capability under CLB t
design loading conditions.
l i
Group 2 (' ~ aker cabinets)- Methods to Manage Aging Mitigation: There are no feasible ways of preventing electrical stressors on the terminal blocks in the RPS trip switchgear cabinets other than through proper installation and maintenance. There are also no feasible ways of preventing fatigue and wear on the RPS trip switchgear cabinets other than not operating the contained equipment; therefore, there are no practical means to prevent fatigue or wear from occurring.
3 s
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APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES j
Discoverv: The effects of these ARDMs are detectable by visual techniques. Inclusion of the RPS trip switchgear cabinets and associated terminal blocks in a regular maintenance / overhaul inspection of these components would provide for the discovery of these ARDMs.
Group 2 (breaker cabinets)- Aging Management Program (s)
Mitigation: There are no CCNPP programs credited with the mitigation of electrical stressors, fatigue, or wear on the RPS trip switchgear cabinets and associated terminal blocks.
Discoverv: The CCNPP PM Program is credited with the discovery of these ARDMs on the RPS trip switchgear and associated terminal blocks. Refer to the previous discussion of the CCNPP PM Program in Group 1 (battery terminals, charger and inverter cabinets) undcr Aging Management Programs.
Eight repetitive tasks, associated with the reactor trip circuit breaker panels, are currently performed every 48 weeks. Guidance on the execution of these repetitive tasks will be modified as needed to examine for the effects of the plausible ARDMs (electrical stress, fatigue, and wear).
For these repetitive tasks, any evidence of these ARDMs will initiate corrective action. Any corrective actions that are required will be performed in accordance with the CCNPP Corrective Actions Program, and will ensure that the components - ' main capable of performing their intended function under all j
CLB conditions. [ Reference 1. BL attachments 1, R]
Group 2 (breaker cabinets)- Demonstration of Aging Management Based on the information presented above, the following conclusions can be reached with respect to the RPS trip switchgear cabinets and associated terminal blocks:
The RPS trip switchgear cabinets and associated terminal blocks have intended functions of maintaining the seismic integrity and/or protection of safety-related components under CLB design conditions.
Electrical stressors, fatigue, and wear are plausible for the carbon steel RPS cabinets and associated terminal blocks, which could lead to loss of seismic integrity and/or protection of safety-related equipment under CLB design conditions.
The CCNPP PM Program will provide for the discovery of electrical stressors, fatigue, and wear that may be of concern for the RPS trip switchgear cabinets vd associated terminal blocks.
These repetitive tasks will be modified to include these ARDMs where they are not presently included.
Therefore, there is reasonable assurance that the effects of these ARDMs on the RPS trip switchgear cabinets will be adequately managed to maintain their intended function under all design loadings required by the CLB during the period of extended operation.
Group 3 (bus cabinets)- Materials and Environment As Table 6.2-3 shows, the bus cabinets' tenninal blocks are susceptible to the effects of electrical stre ors, and the bus cabinets are susceptibb to fatigue and wear. The 125 VDC and 208/120V distrmtion bus cabinets and associated terminal blocks are susceptible to wear and elecMal stressors, Application for License Renewal 6.2-12 Calvert Cliffs Nuclear Power Plant Revision 1
t.
ATTACllMENT m APPENDIX A - TECHNICAL INFORMATION; t
6.2 - ELECTRICAL COMMODITIES while the 480V and 4 kV bus cabinets and associated terminal blocks are susceptible to all three ARDMs. The bus cabinets are made of carbon steel. (Reference 1, BUS-01, Attachments 1,5,6]
The environment that the bus cabinets and associated terminal blocks experience is that of e mild, controlled atmosphere within the CCNPP buildings. Ilowever, at operating voltages of 480V and above, AC hum can produce exposure to low-level vibration. There are also routine maintenance and/or modifications performed on these bus cabinets, which require manipulation of the bus cabinet subcomponents. Terminal blocks attached to the cabinets are used for the termination of electrical connections. These blocks are considered to be part of the cabinets that house them and are included in this evaluation. They are phenolic material subject to the effect of electrical stressors. [ Reference 1, BUS-01, Attachments 5,6]
Group 3 (bus cabinets)- Aging Mechanism Effects The effects of electrical stressors and wear. vere previously discussed in Group 1 (battery l
terminals / charger and inverter cabinets), and fatigue was previously discussed in Group 2 (breakers) under the Aging Mechanisms Effects sections.
l The bus cabinets are subject to the conditions described in the Groups 1 and 2 Aging Mechanism Effects sections and are, therefore, susceptible to the aging effects of these ARDMs. If unmanaged, these ARDMs could eventually result in the loss of seismic support capability and maintenance of electrical l
continuity under CLB design loading conditions
~
Group 3 (bus cabinets)- Methods to Manage Aging Mitigation: There are no feasible ways of preventing electrical stressors on the bus cabinets' terminal blocks other than through proper installation and maintenance. There are also no feasible ways of preventing fatigue and wear on the bus cabinets, which must be opened for maintenance, other than not operating the contained equipment; therefore, there are no practical means to prevent fatigue or wear from occurring.
Discoverv:
The effects of these ARDMs are detectable by visual techniques.
Regular maintenance / overhaul inspections of these components under maintenance / overhaul / inspection repetitive tasks would discover signs of these ARDMs. [ Reference 1, BUS-01, Attachments 1,8]
Group 3 (bus cabinets)- Aging Management Program (s)
Mitigation: There are no CCNPP programs credited with the mitigation of electrical stressors, fatigue, or wear on the bus cabinets and associated terminal blocks.
Discoverv: The CCNPP PM Program is credited with the discovery of these ARDMs on the 125 VDC, 208/120V, 480 VAC, and 4 kV bus cabinets and associated terminal blocks. Refer to the previous discussion of the CCNPP PM Program in Group 1 (battery terminals, charger and inverter cabinets) under Aging Management Programs.
There are curretly seven repetitive tasks that are credited with the discovery of the efTects of electrical stressors and wear on the 125 VDC bus cabinets and associated ter:uinal blocks. These repetitive tasks call for the user to inspect and clean the bus and cabinet. Guidance to examine for the effects of i
Application for License Renewal 6.2-13 Calve't Cliffs Nuclear Power Plant Revismi 1
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1 1
ATTACHMENT d)
APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES l
plausible ARDMs will be provided when these repetitive tasks are executed. Each of these repetitive tasks is currently performed every 10 years. [ References 1,6]
1 Repetitive tasks are credited with the discovery of the effects of electrical stressors and wear on the (18) 125VDC power distribution cabinets in the scope of license renewal. Seventeen existing repetitive tasks call for the user to inspect the cabinets and associated terminal blocks. The interval between successive executions of the repetitive task is every ten years. Guidance to examine for the effects of plausible ARDMs will be provided when these repetitive tasks are executed. [ References 1,6] One additionai repetitive tasks is to be developed.
An additional six repetitive tasks are currently credited with the discovery ri the effects of electrical stressors, fatigue, and wear on the 4 kV bus cabinets and associated terminal eks. These repetitive tasks call for the user to clean, inspect, and test the buses and cabinets. Guidance to examine for the effects of plausible ARDMs will be provided when these repetitive tasks are executed. The interval between successive executions of the repetitive tasks range from 96 weeks to 10 years. IReference 1, Table 5-1, Attachment 1; Reference 6]
Ten repetitive tasks are currently credited with the discovery of the effects of electrical stressors, fatigue, and wear on the 480V bus cabinets and associated terminal blocks. The repetitive tasks call for the user to inspect the buses and cabinets. The interval between successive executions of the repetitive tasks ranges from 44 months to eight years. Guidance to examine for the effects of plausible ARDMs will be provided when these repetitive tasks are executed. [ References 1,6]
Inspection repetitive tasks will be developed for the four 208/120V bus cabinets to inspect for the effects of electrical stress and wear. [ Reference 1]
For all of the repetitive tasks discursed, any evidence of these ARDMs will initiate corrective action.
Any corrective actions that are required will be performed in accordance with the CCNPP Corrective Actions Program, and will ensure that the components will remain capable of performing their intended function under all CLB conditions.
Group 3 (bus cabinets)- Demonstration of Aging Management Based on the information presented above, the following conclusions can be reached with respect to the bus cabinets:
The 125 VDC,208/120V,480 VAC, and 4 kV bus cabinets and asseiated terminal blocks have e
the intended functions of mainta:ning the seismic integrity and/or protection of safety-related ccmponents and maintenance of electrical continuity under CLB design conditions.
Electrical v.ressors and wear are plausible for the 125 VDC and 208/120V bus cabinets and associated terminal blocks, and these two ARDMs, plus fatigue, are plausible for the 480 VAC/4 kV bus cabinets. These ARDMs could lead to a loss of seismic integrity and/or protection of safety-related cor.1ponents and loss of electrical continuity under CLB design conditions.
The CCNPP PM Program will provide for the discovery of any effects due to electrical stressors and wear on the 125 VDC and 208/120V bus cabinets, and electrical stressors, fatigue, and wear i
on the 4 kV and 480 VAC bus cabinets and associated termina! blocks through the use of 1
Application for License Renewal 6.2-14 Calvert Cliffs Nuclear Power Plant Revision 1 I
s ATTACHMENT m 1
APPENDIX A - TECHNICAL INFORMATION-6.2 - ELECTRICAL "OMMODITIES repetitive tasks. Guidance in the performance of ti,.
gtitive tasks will be modified to include these ARDMs where they are not presently included.
Therefore, there is reasonable assurance that the effects of electrical stressors, fatigue, and wear on the 125 VDC,208/120V,480 VAC, and 4 kV bus cabinets and associated terminal blocks will be adequately managed to maintain their intended functions under all design loadings required by the CLB during the period of extended operation.
Group 4 (MCC panels)- Materials and Environment Table 6.2-3 shows that the MCC panels' terminal blocks are susceptible to the effects of electrical stressors, and the MCC panels are susceptible to fatigue, wear, and dynamic loading. TW MCC panels in this group include the emergency diesel generator (EDG) MCC and engine auxiliary MCC panels, and other 480 VAC MCC panels. Only the EDG engine auxiliary MCC panels me susceptible to dynamic loading. The EDG MCC, engine auxiliary MCC, and other MCC panels are made of carbon steelc
[Refecence 1, MCC-01/02, Attachments 1,5,6]
The environment that these device types experience is that of a mild controlled / ventilated atmosphere within the Auxiliary and Turbine Buildings. The EDG engine auxiliary MCCs are located near the EDGs. In this location there is exposure to high-level vibration from the operation of the EDGs. There is also routine maintenance perfcrmed on these device types, which requires manipulation of their subcomponents. Terminal blocks attached to the panels are used for the termination of electrical connections. These blocks are considered to be part of the panels that house them and are included in this evaluation. They are phenolic material subject to the effects of electrical stressors. [ Reference 1, MCC-01/02, Attachments 5,61 3roup 4 (MCC panels)- Aging Mechanism Effects The effects of electrical stressors and wear were previously discussed in Group 1 (battery terminals, charger and inverter cabinets) and fatigue was discussed in Group 2 (breaker cabinet!) under the Aging Mechanisms Effect section.
The EDG MCC, engine auxiliary MCC, and other MCC panels and associated terminal blocks are subject to the conditions described in the Groups I and 2 Aging Mechanisms Effect sections and are, therefore, susceptible to the aging effects of these ARDMs. If unmanaged, these ARDMs could eventually resuh in the loss of seismic support under CLB design loading conditions.
Dynamic loading is only plausible for the EDG engine auxiliary MCC panels. Power plant components and structures are designed to accommodate loads that are expected in service. Experience has shown that, while expected loads have been properly treated, dynamic loads not explicitly considered during j
design have occurred in service, causing naterial degradation and component failure. Although dynamic loading occurs through phenomena wch as water hammer and unstable fluid flow, switchgears are typically not located near the sources of these loads. Components can be subjected to loading due to vibration from equipment such as compressors, diesel generators, and large pumps, as well as vibration
)
from seismic loading. The expected effects of dynamic loading include failure of welds, and failure or j
degradation of fastenes, hardware, and supports. [ Reference 1, MCC-02, Attachments 6,7]
Application for License Renewal 6.2-15 Calvert Cliffs Nuclear Power Plant Revision 1
ATTACHMENT (1)
APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES Since the EDG auxiliary MCC panels are located near the EDGs, which produce vibration, they are considered to be susceptible to dynamic loading. If unmanaged, these plausible ARDMs could eventually result in the loss of seismic support capability under CLB design loading conditions Group 4 (MCC panels)- Methods to Manage A ing R
Mitigation: There are no feasible ways of preventing electrical stressors on the these MCC panels' terminal blocks other than through proper installation and maintenance. There are also no feasible ways of preventing fatigue and wear on the MCC panels other than not operating the contained equipment; therefore, there are no means to prevent fatigue or wear from occurring. In addition, there are no feasible ways of preventing dynamic loading on the EDG engine auxiliary MCC panels other than not running the EDGs. The EDGs must be periodically operated to ensure that they are capable of performing their design function; therefore, there are no means to prevent dynamic loading from occurring.
Discoverv: A program of regular maintenance and inspection for the EDG MCC panel, and associated terminal blocks, could discover indications of fatigue in the panel housing welds, indications of wear in fasteners or portions of the MCC panels that are held together for long periods of time, and indications of electrical stressors and dynamic loading before these ARDMs prevent the EDG MCC panels from performing their passive intended function. [ Reference 1, MCC-01/02, Attachments 1,8]
The effects of these ARDMs, as described above, are detectable by visual techniques. Inclusion of EDG engine auxiliary MCC panel and associated terminal blocks in an inspection program that inspects a sample of representative equipment for the signs of these ARDMs during the period of extended operation would provide for the discovery of these ARDMs in the EDG MCC panels. [ Reference 1, I
MCC-02, Attachments 1,8]
If unmanaged, these ARDMs could eventually result in the loss of seismic support capability under Cl3 design loading conditions Group 4 (MCC panels)- Aging Management Program (s)
Mitigation: 'Ihere are no CCNPP programs ' credited with the mitigation of electrical stressors, fatigue, and wear on the EDG MCC panel and associated terminal blocks and tne mitigation of these three ARDMs and dynamic loading on the EDG engine aaxiliary MCC panels.
Discoverv: The CCNPP PM Program is credited with the discovery of these ARDMs on the MCC panel and associated terminal blocks. Refer to the previous discussion of the CCNPP PM Program in Group 1 (battery terminals, charger and inverter cabinets) under Aging Management Programs.
1 Three repetitive tasks are currently credited for the discovery of the electrical stressors, fatigue, and wear i
on the EDG MCC panels. The repetitive tasks direct the user to inspect the EDG MCC panels. Guidance to examim, for the effects of plausible ARDMs will be provided when these repetitive tasks are executed.
The interval between successive executions of the repetitive tasks is currently every six years.
[ References 1,6]
Additionally, repetitive tasks are credited with the discovery of electrical stressors, fatigue, and wear on safety-related 480 VAC MCC p nels and their associated terminal blocks. Fourteen existing repetitive tasks direct the users to inspect the 480V MCC panels. Guidance to examine for the effects of plansible Application for License Renewal 6.2-16 Calvert Cliffs Nuclear Power Plant Revision 1
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ATTACHMENT m APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES ARDMs will be provided when these repetitive tasks are executed. These repetitive tasks are currently performed at 66 month,6-and 10-year intervals. [ References 1,6] One additional repetitive task is to be developed.
Three repetitive tasks are currently credited with the discovery of the effects of wear, fatigue, electrical stress, and dynamic loading on the EDG auxiliary MCC panels and associated terminal blocks. These 3
repetitive tasks require inspect on of the panels. The interval between successive executions of the i
repetitive tasks is currently 44 months. Guidance to examine for the effects of these plausible ARDMs will be provided when the repetitive tasks are executed. [ References 1,6]
For all of the repetitive tasks discussed, any evidence of these ARDMs will initiative corrective action.
Any corrective actions that are required will be performed in accordance with the CCNPP Corrective Actions Program, and will ensure that the components will remain capable of performing their intended function under all CLB conditions.
Group 4 (MCC panels)- Demonstration of Aging Management Based on the information presented above, the following conclusions can be reached with respect to the EDG MCC and engine auxiliary MCC panel and associated terminal blocks:
These MCC panels and associated terminal blocks have an intended functica of maintaining the seismic integrity and/or protection of safety-related components under CLB design conditions.
Electrical stressors are plausible for the MCC panels' terminal blocks, while fatigue, and wear are plausible for the EDG and safety-related 480 VAC MCC carbon steel panels. Wear, fatigue, and dynamic loading are plausible for the EDG engine auxiliary MCC carbon steel panels. This susceptibility could lead to a loss of seismic integrity and/or protection of safety-related equipment.
The CCNPP PM Program will provide for the discovery of the effects of electrical stressors, fatigue, snd wear on the EDG MCC and safety-related 480 VAC MCC panels and associated terminal blocks through the use of repetitive tasks. The repetitive tasks will provide for the discovery of fatigue, wear, and dynamic loading on the Group 4 MCC panels. These repetitive tasks will include guidance to examine for the effects of plausible ARDMs.
Therefore, there is reasonable assurance that the effects of electri:al stressors, fatigue, wear, and dynamic loading on the EDG MCC panels and engine auxiliary MCC panels and other 480V MCC panels will be adequately managed in order t's maintain their intended fimetion under all design loadings required by the CLB during the period of extended operation.
Group 5 (local control station panels)- Materials and Environment Table 6.2-3 shows that the 125/250 VDC,480 VAC, and 4 kV local control station panels and associated terminal blocks are susceptible to the effects of electrical stressors, fatigue, and wear. In addition to these ARDMs, the 480 VAC boric acid pump control panels and saltwater air compressor (SWAC) local control statio'i panels are also susceptible to the effects of general corrosion. All of the enclosures for these device types are constructed of carbon steel.
[ Reference 1, Attachment 1, NA, NB, ND, Attachments 5,6]
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ATTACIIMENT (D APPENDIX A - TECHNICAL INFORMATION; i
6.2 - ELECTRICAL COMMODITIES The environment tnat these device types experience is that of a mild controlled atmosphere within the CCNPP Auxiliary Building. Terminal blocks attached to the cabinets are used for the termination of electrical connections. These blocks are considered to be part of the panels that house them and are included in this evaluation. They are phenolic material subject to the effects of electrical stressors. The boric acid pump and SWAC local control stations are located in regions with piping that contains either borated water or saltwater. [ Reference 1, NB-01, Attachments 6,7; Reference 1, MCC-02, PNL-01, ]
Group 5 (local control station panels)- Aging Mechanism Effects The effects of electrical stressors, wear, and general corrosion were previously discussed in Group 1 (battery terminals, charger and inverter cabinets) and fatigue was discussed in Group 2 (breaker cabinets) under the Aging Mechanisms Effects sections.
The local control station panels are subject to the conditions described in the Group 1 Aging Mechanisms Effects section and are, therefore, susceptible to the aging effects of these ARDMs. If unmanaged, these 1
ARDMs could eventually result in the loss of seismic support capability under CLB design loading conditions.
General corrosion is plausible for the boric acid pump control panels and SWAC local control station I
panels. If unmanaged, general cerrwion could eventually result in the loss of seismic support capability under CLB design loading condincas. [ Reference 1, NB-01]
Group 5 (local control station panels)- Methods to Manage Aging Mitigation: There are no feasible ways of preventing electrical stressors on these local control station panels other than through proper installation and maintenance. There are also no feasible ways of preventing fatigue and wear on the local control station panels other than not operating the contained equipment; therefore, there are no practical means to prevent fatigue or wear from occurrin2-Discoverv: A program of regular maintenance and inspection for the local control panel and associated terminal blocks would discover indications of fatigue in the housing welds, indications of wear in fasteners or portions of disconnect cabinets that are held together for long periods of time, and indications of electrical stressors and general corrosion before these ARDMs prevent the local control stations from performing their passive intended function. [ Reference 1, NA-01, NB-01, ND-01, Attachments 1,8]
I inclusion 51 a program that examines a representative sample of susceptible local control panels for signs of these ARDMs could provide for the discovery of these ARDMs on these control panels.
l Group 5 (local control station panels)- Aging Management Program (s)
Mitigation: There are no CCNPP programs credited with the mitigation of electrical stressors, fatigue, wear, and general corrosion on the local control station panel and associated terminal bioeks.
Discoverv: The CCNPP PM Program is credited for the discovery of electrical stressors, fatigue, and wear on the local control station panels and associated terminal blocks. Refer to the previous discussion of the CCNPP PM Program in Group 1 (battery terminals, charger and inverter cabinets) under Aging Application for License Renewal 6.2-18 Calvert Cliffs Nucleai Power Plant Revision 1
ee ATTACHMENT m APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES Management Programs. The following discussion explains how the CCNPP PM Program will be used to manage the effects of plausible aging on Group 5 panels NA Subgroun - 4 kV Panels There are currently 12 repetitive tasks credited with discovering the effects of electrical stressors and wear. The repetitive tasks call for inspection of the 4kV local control panels at 96-week and 2-year intervals. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress and wear) when these repetitive tasks are executed. [ References 1,6]
I NB Subgroun - 480 VAC Local Control Stations l
Twelve repetitive tasks are currently credited with discovering the effects of electrical stressors, wear, and fatigue of these panels. The repetitive tasks call for inspection of the indicated 480V local control panels at 96-week intervals. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress, wear, and fatigue) when these repetitive tasks are executed. [ References 1,6]
i
'ND Subgroun - 125/250 VDC Local Control Stations Ten repetitive teks will be devcloped to discover the effects of electrical stressors and wear of these panels. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress and wear) when these repetitive tasks are executed. [ References 1,6]
SWAC Local Control Panel Subproun Four repetitive tasks are currently credited with discovering the effects of electrical stressors, wear, fatigue, and general corrosion of these panels. The repetitive tasks call for inspection of the SWAC local control panels at 44 month intervals. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress, wear, fatigue, and general corrosion) when these repetitive tasks are executed.
[Peferences 1,6]
Boric Acid Pumn Local Control Panel Subgroun Four repetitive tasks will be developed to discover the effects of electrical stressors, wear, fatigue, and general corrosion of these panels. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress, wear, fatigue, and general corrosion) when these repetitive tasks are executed.
[ References 1,6]
i Fire Local Control Panel Subgroun There are 70 panels in this subgroup. Inspection repetitive tasks exist for 17 of these renels to discover the effects of electrical stressors and wear. The inspection interval for these existing repetitive tasks ranges from 12 to 96 weeks. Inspection repetitive tasks will be developed for the remaining 53 panels in this subgroup to discover any effects from electrical stressors and wear. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress and wear) when these repetitive tasks are executed. [ References 1,6]
H&V Local Control Panel Subgroun j
There are 31 panels in this subgroup. Inspection repetitive tasks exist for eight of these panels to discover the effects of electrical stressors, wear, and fatigue. Inspection repetitive tasks will be developed for the remaining 23 panels in this subgroup to discover these ARDMs. The existing Application for License Renewal 6.2-19 Calvert Cliffs Nuclear Power Plant Revision I
S ATTACIIMENT (1)
APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES repetitive tasks are performed at 44 month and 2 year intervals. Guidance will be provided to inspect for 1
the effects of the plausible ARDMs (electrical stress, wear, and fatigue) when these repetitive tasks are executed. [ References 1,6]
1 Pressurizer Heater Local Control Panel Subgroun There are currently four repetitive tasks credited with the discovery of the effects of electrical stressors, wear, and fatigue. These repetitive tasks are currently performed at 10 year intervals. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress, wear, and fatigue) when these repetitive tasks are executed. [ References 1,6) i NY Local Control Panel Suberoun i
Inspection repetitive tasks will be developed for the instrument air containment isolation local control panels to inspect for the effects of electrical stressors and wear. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress and wear) when the repetitive tasks are executed.
[ Reference 1]
For all of the repetitive tasks discussed, any evidence of these ARDMs will initiate corrective action.
Any corrective actions that are required will be performed in accordance with the CCNPP Corrective Actions Program, and will ensure the components will remain capable of performing their intended function under all CLB conditions.
Group 5 (local control station panels)- Demonstration of Aging Management Based on the information presented above, the following conclusions can be reached with respect to electrical stressors, fatigue, wear, and general corrosicn on the local control station panels susceptible to these ARDMs:
The local control station panels' terminal blocks are susceptible to electrical stressors. These local control station panels are susceptible to fatigue, wear, and general corrosion and have an intended function of maintaining the seismic integrity and/or protection of safety-related components under CLB design conditions.
The CCNPP PM Program will provide for the discovery of the effects of plausible ARDMs on the local control station panel and associated terminal blocks through the use of inspection repetitive tasks. Inspection repetitive tasks will be developed where none currently exist for panels in the scope of License Renewal. Guidance will be provided to inspect for the effects of the plausible ARDMs when these repetitive tasks are executed.
Therefore, there is reasonable assurance that the effects of electrical stressors, fatigue, wear, and general corrosion on the local control station panel and associated terminal blocks will be adequately managed to r,aintain the intended function of these components under all design loadings required by the CLB during the period of extended operation.
1 Application for License Renewal 6.2-20 Calvert Cliffs Nuclear Power Plant Revision 1
ATTACIIMENT (1)
APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES Group 6 (miscellaneous panels)- Materials and Environment As Table 6 2-3 shows, the miscellaneous panels' terminal blocks are susceptible to the effects of electrical stressors, while the panels are susceptible to fatigue and wear. In additica, some of the panels are also su'aject to the effects of dynamic loading. The pane! enclosures in this group are made of carbon steel. [Re,ference 1, PNie01/02/03, Attachments 1,5,6)
The environment that these device types experience is that of a mild controlled or ventilated atmosphere within the CCNPP buildings. In some locations, there is exposure to high level vibration from EDG operation. There is also routine maintenance performed on this device type, which requires manipulation of their subcomponents. Terminal blocks attached to the cabinets are used for the termination of electrical connections. These blocks are considered to be part of the panels that house them and are included in this evaluation. They are phenolic material subject to the effects of electrical stressors.
[ Reference 1, PNL-01/02/03, Attachments 5,6]
Group 6 (miscellaneous panels)- Aging Mechanism Effects The effects of electrical stressors, wear, fatigue, and dynamic loading were previously discussed in Groups 1, 2 and 4 under the Aging Mechanisms Effects sections.
The panels are subject to the conditions described in the Group 1,2, and 4 Aging Mechanism Effects sections and are, therefore, susceptible to the aging effects of these ARDMs. If unmanaged, these ARDMs could eventually result in the loss of seismic support capability under CLB design loading conditions.
Group 6 (miscellaneous panels)- Methods to Manage Aging Mitigation: There are no feasible ways of preventing electrical stressors on the panels' terminal blocks other than through proper installation and maintenance. There are also no feasible ways of preventing wear, fatigue, or dynamic loading on the panels other than not operating the contained equipment or associated EDGs; therefore, there are no practical means to prevent the effects of these ARDMs from occurring.
Discoverv: A program of regular maintenance and inspection for these panels and associated terminal blocks would discover indications of fatigue and dynamic loading in the housing welds, indications of wear in fasteners or portions of panels that are held together for long periods of tiir" and indications of electrical stressors before these ARDMs prevent the panels from performing their passive intended function. [ Reference 1, PNL-01/02, Attachments 1,8]
Inclusion in a program that examines a representative sample of susceptiole panels for signs of these ARDMs could provide for the discovery of these ARDMs on these panels.
Group 6 (miscellaneous panels)- Aging Management Program (s)
Mitigation: There are no CCNPP programs credited with the mitigation of electrical stressors, wear, fatigue, or dynamic loading on the miscellaneous system panel and associated terminal blocks.
Application for License Renewal 6.2-21 Calvert Cliffs Nuclear Power Plant Revision 1
ATTACIIMENT (1)
APPENDIX A - TECHNICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES Discsyrry: The CCNPP PM Program is credited with the discovery of these ARDMs on the panel and associated terminal blocks for the plant systems previously listed in the scoping section. Refer to the previous discussion of the CCNPP PM Program in Group 1 (battery terminals, charger and inverter cabinets) under Aging Management Programs. The PM Program utilizes repetitive tasks to discover the effects of electrical stressors, wear, fatigue, and dynamic loading on miscellaneous system panels and
]
associated terminal blocks. These repetitive tasks will be modified to include these ARDMs where they are not presently included. [ Reference 1, Tables 5-1,5-2,5-3, PNL-01/02/03, Reference 6]
The following discussion relates the aging management programs for the various subgroups of Group 6.
"C" Main Control Panel Subgroun There are 168 panels in this subgroup subject to plausible electrical stress, wear, fatigue, and dynamic loading. All are subject to electrical stress and wear. A few are also subject to fatigue or dynamic j
loading. Inspection repetitive tasks must be developed for 64 of these panels. The other 104 existing repetitive tasks are credited with discovering the effects of electrical stressors, wear, fatigue, and dynamic loading as required. Inspections for these repetitive tasks currently range from 12 weeks to 48 months. Guidance will be provided to inspect for the effects of the plausible ARDMs when these and the newly-developed repetitive tasks are executed. [ References 1,6]
"G" DG1 A Local Panel SubgmW There are currently three repetitive tasks credited with discovery the effects of electrical stressors, wear.
i fatigue, and dynamic loading for this subgroup. These are currently performed every 96 weeks. Four new repetitive tasks will be developed to discover these ARDMs for the remaining panels in this subgroup. Guidance will be provided to inspect for the effects of the plausible ARDMs when these repetitive tasks are executed. [ References 1,6]
"J" Cabinet Subgroun There are 14 cabinets in this subgroup. New inspection repetitive tasks must be developed for all but one panel, which has an existing repetitive task. This existing repetitive task is currently performed every 44 months. Guidance will be provided to inspect for the effects of the plausible ARDMs (electrical stress and wear) when these repetitive tasks are executed. [ References 1,6]
"K" Annunciator Cabinet Subgroun There are currently six inspection repetitive tasks that are credited with discovering the effects of electrical stressors and wear for this subgroup. One new repetitive task will be developed to look for these ARDMs. The current repetitive task intervals for this subgroup range from 48 weeks to 5 years.
Guidance will be provided to inspect for the effects of the plausible ARDMs when the repetitive tasks are executed. [Refe ences 1,6]
"L" Lighting Panel Suberoun Five inspection repetitive tasks,' two existing and three to be developed, are currently credited with discovering electrical stressors and wear for this subgroup. The surveillance interval for the existing repetitive tasks is every five years. Guidance will be provided to inspect for the effects of the plausible ARDMs when the repetitive tasks are executed. [ References 1,6]
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APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES "P" Power Distribution Panel Subuoup Six inspection repetitive tasks, one existing and five to be developed, are currently credited with discovering electrical stressors, wear, and fatigue for this subgroup. The surveillance interval for the existing repetitive task is every 66 months. Guidance will be provided to inspect for the effects of the plausible ARDMs when the repetitive tasks are executed. [ References 1,6)
"O" Cabinet Subgroun Twelve existing repetitive tasks are credited with discovering the effects of electrical stressors and wear for this subgroup. The inspections are performed in a range from 12-week to 2-year intervals. Guidance will be provided to inspect for the effects of the plausible ARDMs when the repetitive tasks are executed.
[ References 1,6]
"R" Power Sunolv Panel Subgroyp Two existing repetitive tasks are currently credited for the discovery of the effects of electrical stressors and wear of this subgroup. The current repetitive task interval for this subgroup is two years. Guidance
)
will be provided to inspect for the effects of the plausible ARDMs when the repetitive tasks are executed.
[ References 1,6) l "T" Turbine Control Subgroun l
l Three inspection repetitive tasks, two existing and one to be developed, are currently credited with l
discoverint, electrical stressors and wear for this subgroup. The surveillance interval for the existing repetitive tasks is every two years. Guidance will be provided to inspect for the effects of the plausible ARDMs when the repetitive tasks are executed. [ References 1,6]
"Y" Vitat Instrument AC Panel Subproun Twelve existing repetitive tasks are credited with discovering the effects of electrical stressors and wear for this subgroup. The inspections are performed at 10-year intervals. Guidance will be provided to inspect for the effects et the plausible ARDMs when the repetitiva tasks are executed [ References 1,6]
For all of the repetitive tasks discussed, any evidence of these ARDMs will initiate corrective action.
Any corrective actions that are required will be performed in accordance with the CCNPP Corrective Actions Program, and will ensure the components will remain capable of performing their intended function under all CLB conditions.
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Group 6 (miscellaneous panels)- Demanstration of Aging Management
\\
- ued on the information presented above, the following conclusions can be reached with respect to
- tectrical stressors, fatigue, wear, and dynamic loading on the miscellaneous panels susceptible to these ARDMs
The CCNPP miscellaneous sys2m panels' terminal blocks are susceptible to electrical stressors.
e The miscellaaeous panels are susceptible to fatigue, wear, and dynamic loading, and have the intended functions of maintaining the seismic integrity and/or protection of safety-related components and electrical continuity under CLB design conditions.
j The CCNPP PM Program will provide for the discovery of the efTects of electricrJ stressors, e
fatigue, wear, and dynamic loading on the mir.cellaneous system panel and associated terminal Application for License Renewal 6.2-23 Calvert C!iffs Nuclear Power Plant Revision I l
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APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES blocks through the use of repetitive tasks. These repetitive tasks will be modified to include these ARDMs where they are not presently included New repetitive tasks will be developed where none currently exist.
Therefore, there is reasonable assurance that the effects of these ARDMs on the miscellaneous system panels will be adequately managed to maintain their intended functions under all design loadings required by the CLB during the period of extended operation.
6.2.3 Conclusion The program (s) discussed for ECE are listed in the following table. These programs are (or will be for new programs) administratively control:ed by a formal review and approval process. As demonstrated above, these programs will manage the aging mechanisms and their effects such that the intended functions of the ECE will be maintained, consistent with the CLB, during the period of extended operation.
The analysis / assessment, corrective action, and confirmation / documentation process for license renewal is in accordance with QL-2, " Corrective Actions Program." QL-2 is pursuant to 10 CFR Part 50, Appendix B, and covers all structures and wnponents subject to aging management review.
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APPENDIX A - TECIINICAL INFORMATION; 6.2 - ELECTRICAL COMMODITIES TABLE 6.2-4 l
LIST OF AGING MANAGEMENT PROGRAMS FOR ECE Program Credited As Modified Cedain checklists associated with existing Discovery of various aging mechanisms as repetitive tasks gu.erned by CCNPP detailed in the " Aging Management Maintenance Program Procedure Programs" section of Group 1,2,3,4,5, and MN-1-102, " Preventive Maintenance 6 discussions.
Program" New New repetitive tasks and associated Discovery of various aging mechanisms as l
checklists, governed by CCNPP detailed in the " Aging Manegement 1
Maintenance Program Procedure Programs" section of Group 3,4,5, and 6 j
MN-1-102, " Preventive Maintenance discussions.
Program" l
6.2.4 References 1.
"CCNPP Aging Management Review Report for the Electrical Commodities, Volumes 1 and 2" Revision 1, July 23,1997 2.
Calvert Cliffs Nuclear Power Plant, Updated Final Safety Analysis Report, Revision 24 3.
Letter from Mr. G. C. Creel (BGE) to Mr. T. T. Martin (NRC), dated May 29,1990, " Unit 1 Startup Assessment" 4.
CCNPP Administrative Procedure MN-1-102," Preventive Maintenance Program," Revision 7, December 17,1998 l
5.
Letter from Mr. R. W. Cooper II (NRC) to Mr. C. H. Cruse (BGE), dated May 31, 1996, "Calvert Cliffs Plant Performance Review Results" 6.
CCNPP NUCLEIS Database, Preventatise Maintenance Repetitive Task Scheduler l
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