ML20138B306
| ML20138B306 | |
| Person / Time | |
|---|---|
| Issue date: | 04/04/1997 |
| From: | Aggarwal S NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Collins M NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9704290119 | |
| Download: ML20138B306 (53) | |
Text
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l UNITED STATES g
j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20666-4001
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April 4, 1997 t
MEMORAT IM "3: Michael D. Collins j
Document Control Desk (0-5D3) i Information and Records Management Branch $
FROM:
Satish K. Aggarwal F
Electrical, Materials and Mechanical Engineering Branch Division of Engineering Technology, RES
SUBJECT:
INFORMATION EXCHANGE MEETINGS WITH INDUSTRY l
ON ENVIRONMENTAL QUALIFICATION Attached are the following two documents:
4 (1)
Minutes of NRC Research Information Exchange Meeting (January 8,1997) 4 (2)
Minutes of NRC Research Information Exchange Meeting (February 12,1997)
These documents are released for placement in the Public Document Room (PDR).
Attachments: As stated cc: Curt Nelson, SNL A
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9704290119 970404 PDR ORO NREB PDR pg4 06 ll ll ll lll1.lll.l.ll l.l
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Minutes of NRC Research Information Exchange Meeting Held January 8,997 NRC HQ, Rockville, Maryland 4
A meeting was held by the NRC Office of Nuclear Regulatory Research (RES) to obtain industry input on the ongoing research program for Environmental Qualification oflow-Voltage Instrumentation and i
Control (I&C) cables. In addition to RES, participants in the meeting included representatives from the NRC Office of Nuclear Reactor Regulation (NRR), various nuclear industry representatives, DOE representatives, and a representative from Brookhaven National Laboratory, the lead research lab for
)
this program. A complete list of attendees is attached along with the meeting agenda and viewgraphs presented. The following items were discussed:
Items Discussed:
1.
NRC opened the meeting stating that this is not a regulatory meeting but a meeting on research, and that the discussions should focus on technology. It was noted that, pending results of a supplemental literature review by Brookhaven,9 additional issues may be potentially resolved from the August meeting with industry. NRC reviewed the remaining 6 EQ issues planned for study. They are:
- Comparison of natural and artificial aging
- Accuracy of activation energy estimates
- Multiple versus single conductor cables
- Bonded jacket cables
- CM techniques for monitoring cable condition
- CM techniques to predict accident survivability The current research status was reviewed, including information on the 1st LOCA run. The EQ documents still not received from industry were requested by NRC. NRC will provide an updated list.
2.
It was noted that four issues were reclassified to unresolved with no new research planned based on the August meeting with industry. These issues, which will now be addressed using information obtained from research on other issues, are:
Hot spots
- Requalification options
- Use of operating experience
- Options for life extension A question was raised as to whether the reclassification of 4 issues to Category 4 meant that these are resolved or not resolved. NRC responded that these are not resolved, however, they might be resolved using the research results obtained from studying the 6 remaining issues, and no specific new research is planned to address these four issues.
Disk: EO7 FILE: CMMTU. MIN DATE: 3/10/97 1
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3.
NRC presented the proposed modifications to the Condition Monitoring (CM) Test Plans, which are being considered. Thesa include 1) deletion of EMF measurement, and 2) inclusion of some low temperature / dose rate preaging.
Industry. stated that at the October meeting of NRC/NUGEO, NRC also showed the inclusion of density measurement. NRC responded that i
the most current plan does not include it mainly because of economic reasons. Also, DOE has
)
a program with Sandia in which density measurement was studied, and there is no need to 1
duplicate this effort.
I 4.
NRC reviewed industry's participation in providing naturally aged cables to BNL, and noted tnat no progress has been made. NRC is giving up on this effort. One industry representative stated that BNL did not provide enough information for the industry to help. Also, if they don't have input to the test plans they have no interest in supplying cables. BNL noted that detailed j
information on the cables needed was provided (a cable acquisition plan was developed and i
distributed to industry). Also, test plans were prepared and made publicly available by the NRC in February 1996, so they were available for industry review and comment. However, no comments were received. Industry feels that the plans do not include sufficient detail.
J 5.
Industry feels the staff is not aware of day-to-day activities in the plants related to EO.
Therefore, there is a lack of confidence in this research effort.
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' 6.
Regarding the planned CM research, industry questioned whether acceptance criteria will be j
developed for the techniques being studied. In response it was noted that this is currently part of the CM plan. Data will be obtained during preaging to 20,40 and 60 years of aging, as well i
as before and after accident testing. This was included in the plan specifically to obtain data for i
developing acceptance criteria for the CM techniques.
7.
It was noted that in the current research plans, BNL will age cables to the equivalent of 60 years of service. Industry stated that 60 years of aging with the original qualification parameters will be too harsh. They want to know whether it is possible for this research to use more realistic j
plant conditions for 60 years. Industry also noted that in past research, cables were aged to 125 i
% (50 yrs) of expected service, and this severely damaged the cables. Therefore,150 % (60 yrs) will definitely damage the cables. Since this information is already available, it is unclear why BNL will age cables to 60 years. Others agreed that 60 years of aging using the original qualification parameters instead of more realistic actual plant service conditions will severely damage the cables. Also, plants will not operate for 60 years at elevated temperatures, therefore, there is no need to age to 60 years.
8.
NEI asked whether industry will not have to perform any CM tests if the cables pass LOCA tests after 60 years of aging. NRC responded that it is too early to say anything on what NRC will require regarding CM. Another NRC staff stated that qualification is a design assumption.
Thus, it is important to make sure that these assumptions are good. If the cables are not aging as fast as assumed, there should be a way to incorporate that.
Disk: EQ7 FILE: CMMTG. MIN DATE: 3/10/97 2
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9.
One industry representative said that industry and NRC should not worry about qualified life.
He continued that what is important is the condition of the cables. Some plants are testing sacrificial specimens, and they are confident that the cables will go beyond 40 years. If other plants are not performing similar testing, condition monitoring is an important issue. This is the basis for considering the use of a " Condition Based" Qualified Life instead of the currently used
' Time Based" Qualified life. BNL. is evaluating this as part of the EQ effort.
10.
BNL reviewed their CM test plans. It was noted that BNL is in the process of modifying the CM methods to be evaluated based on discussions with the NRC. BNL is interested in hearing industry comments on the list of" Reduced Scope CM Methods." There was one comment which doubted whether visual inspection can be used as an effective quantitative method. However, the general consensus was that visual inspection can be used as a screening method to locate the areas that need further CM testing. One industry representative stated that it is difficult to see color changes and sheen variations due to the dust accumulation and generally poor lighting conditions inside a plant. It was suggested that tactile inspections be included with the visual inspection, such as a thumb nail test and bending test. BNL responded that it is difficult to conduct tactile tests such as a thumb nail test inside containment since one must wear protective gloves and clothing. It was suggested that lifting ated slight bending of the cables should be added to the visualinspection method. Aside from this comment, there were no other significant comments on the CM test plans. NRC requested that any comments on the CM or LOCA plans be provided within two weeks.
11.
EPRI briefed the attendees on the IAEA activities on cable CM research. Sue Burnay of England is heading the group which has members from Canada (Ontario Hydro), France (EDF),
Minatom (Russia), Sweden, Japan (JAERI), Romania, and Czech Republic. It is not known whether Germany represented by Wolfgang Michel from Siemens will participate. The current activity is a round-robin test utilizing three CM methods: indenter, OIT, and TGA for PVC.
When asked if dielectric loss is included in the plan, EPRI stated that AEA (Sue Burnay)is the only organization that claims success on this method and only on specific cables. For the round-robin test, Sue Burnay will age a 6 meter long cable and distribute 1 meter to each participant for testing. This round-robin test is mainly to determine the repeatability of the test methods among different test facilities. EPRI mentioned that BNL should participate in this effort since they are performing CM tests in their program. NRC responded that they are interested in this IAEA effort and will consider having BNL participate.
12.
EPRI mentioned that Sandia proposed an EAB test for composite materials which is for suitable for testing bonded jacket cable insulation. DOE stated that this proposal is under review. Upon j
BNL's request for the proposal, DOE agreed to send it to NRC.
13.
BNL raiewed the current status of obtaining UConn cable specimens and conducting indenter testing on available whole cables at UConn. EPRI suggested that NRC add verification of the UConn EAB test method, which uses microtomed film specimens, by comparing the UConn j
results with results from the BNL method, which uses die cut specimens. BNL mentioned that this verification will help EPRI, however, it is not clear that it will help the BNL program. Also, there is some cost involved for BNL to include this work in the program. NRC stated that they will consider whether to include this verification testing in the program.
DISK: EQ7 FILE: CMMTU. MIN DATE 3/10S7 3
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14.
NEI asked whether the NRR Task Action Plan (TAP) for EQ will be transferred to RES. NRC responded that the function of EQ dealing with everyday EQ issues will be transferred to the Electrical Engineering Branch of NRR, while the TAP will be transferred to RES, with the i
exception of some NRR specific regulatory actions. The Systems Division will finalize the report l
for the Commission, and a senior PRA specialist is looking at the PRA part. After these are j
completed, the TAP will be transferred to RES.
15.
NEI asked how the resolution of the 13 issues will be documented. NRC responded that a NUREG or Staff White Paper will be prepared.
16.
It was noted that BNL is using Rockbestos Report 1806 for the aging parameters for the Rockbestos cables in LOCA Run 1. This report is being used since it is the qualification basis used by the plant supplying the naturally aged cables. Industry commented that this report was disapproved by NRC and was subsequently withdrawn, therefore, it should not be used. This will be investigated. An industry representative asked what would happen if someone claimed the research is not acceptable because the wrong aging process was used. NRC responded that one can never answer all the questions. The way the qualification will be done is still 10 CFR 50.49.
One cannot run away from the Arrhenius method; the cables must be qualified. Industry asked whether this will apply to DOR cables also, and NRC responded it would.
17.
Industry questioned how CM methods will be utilized. NRC responded that they cannot say how CM methods will be applied at this time. The ongoing research will provide information on which CM methods work.
18.
EPRI suggested that NRC/BNL should include the evaluation of a microspecimen sampling
)
technique using the BNL LOCA specimens. This would be useful since some plants are reluctant to damage the cables to obtain the microspecimens. Industry added that some plants are not comfortable even with indenter testing. Upon this suggestion, NRC stated that it is not a good idea to damage the LOCA specimens for this purpose. Therefore, it would not be included in the current program.
19.
A discussion was held on the issue of studying the failure mechanism of multi-conductor cables.
Industry believes that this is not an issue. NRC requested that industry supply additional information which can resolve the issue.
20.
Industry asked what NRC is going to do with the research results from the issues of Arrhenius Method and Activation Energy. NRC responded that it is too early to say. Industry suggested that NRC postpone the study ofissues 1 and 2, and use the available funding for something else.
NRC asked how BNL is going to study these issues. BNL responded that the Arrhenius method and the activation energy issue are interrelated, and can be considered one issue. BNL will utilize the naturally aged cables and the artificially aged cables, which will be aged to simulate the naturally aged cables. These will be compared to provide information on the conservatism in the Arrhenius method. On the issue of uncertainty in activation energies, BNL is not planning a full-blown research program. Instead, BNL will verify the activation energies of the cables in the program by conducting a small scale experiment. NRC concluded that the research on these issue will potentially generate useful information, and it is worth the incremental cost. Therefore, they will be kept in the program.
I Disk: EQ7 FILE: CMMMMIN DATE: 3/10/97 4
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RESEARCII INFORMATION EXCHANGE MEETING WITII TIIE INDUSTRY TOPIC:
Environmental Qualification of Low-Voltage Instrumentation and Control (I&C)
Cables l
DATE:
Wednesday, January 8,1997 LOCATION: NRC-HQ Conf Room T-10-A-1 PURPOSES: (I) To prioritize the remaining technical issues related to the environmental qualification (EQ) oflow-voltage instmmentation and control (I&C) cables; (ii) to discuss promising condition monitoring (CM) techniques for cables and to discuss NRC test plans; and (iii) to discuss areas for cooperation.
AGENDA 08:30 am Opening Remarks M. Mayfield, NRC 08:45 am Identification of EQ Issues, Prioritization of Remaining Issues, Resea ch Status S. Aggarwal, NRC 10:00 am Review of Documents and Data Promised at the August EQ Technical Meeting S. Aggarwal, NRC 10:30 am BREAK 10:45 am What does " Condition Monitoring" mean?
What are the promising techniques?
Discuss NRC test plans B. Soon Lee, BN1 12:00 N LUNCH 01:00 pm Industry Perspective on CM J. Hutchinson, EPRI 02:00 pm General Discussion on CM and ALL Areas of Cooperation 1
03:30 pm ADJOURN
e, RESEARCH INFORMATION EXCHANGE MEETING Environmental Qualification of low Voltage Instrumentation and Control Cables ATTENDEES f
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Research information Exchange Meeting with Industry I
Environmental Qualification of Electric Cables i
Presented by:
i Satish Aggarwal
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i Office of Nuclear Regulatory Research i
f Rockville, Maryland I
January 8,1997 l
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Original EQ issues 43 issues identified in 7 Areas 1.
Preaging Techniques 1
2.
Conservatism in the EQ Process l
3.
Variation in Manufacturing i
4.
High Stress Field Conditions 5.
Condition Monitoring i
6.
EQ for Life Extension 7.
Graded Approach for EQ 4
}
s 2
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Preliminary Results of EQ Technical Meeting b
Resolution of 9 Additional Issues being Considered (Pending review of promised data) 1.
Humidity Effects 2.
Vibration l
3.
Liquid Impingement t
i 4.
Physical Damage t
5.
Bends / vertical runs / overhangs 6.
Cable trays / conduits 7.
Fire protective coatings 8.
Improper installation
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L 9.
Definition of qualified life 3
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Preliminary Results of EQ Technical Meeting (cont'd) i Reclassification of 4 issues being considered Category 4: no new research; address issued as part of, and using results of research on other issues L
1.
Hot-Spots l-2.
Life Extension Options 3.
Use of Operating Experience 4.
Extension of Qualified Life i
Modifications to Test Plans being Considered l
i
- Deletion of EMF measurement i
-Inclusion of some low temperature / dose rate preaging
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i Preliminary Results of EQ Technical Meeting
)
(cont'd)
Restating of 2 issues being Considered I
ISSUE 1: How do accelerated aging techniques used in the original qualification compare j
with naturally aged cables?
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ISSUE 16: What are the options to extend the qualified life of electric cables?
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c Specifically, can the concept of qualified life be extended to include condition based life?
?
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t Remaining EQ lssues for which New Research Will Be Performed r
1.
Uncertainties Associated wit.i Arrhenius Process 2.
Uncertainties Associated with Activation Energies i
3.
Failure Mechanisms in Multi-Conductor Cables 4.
Failure Mechanisms in Bonded Jacket Cables 5.
CM for Monitoring Current Cable Condition l
6.
CM for Predicting Accident Survivability i
e i
6
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EQ issues to be Addressed using Research for Other issues t
1.
Addressing Hot-Spots in the EQ Process 2.
Requalification Options for : ife Extension f
3.
Using Operating Experience for Life Extension 4.
Using the Current EQ Process to Extend Qualified Life i
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Prioritizing of issues
- Prioritizing is Not Necessary
- Test matrix is designed to address CM and LOCA testing
- Each LOCA run provides information to address multiple EQ issues, as well as providing data to evaluate CM techniques j
- Prioritizing issues will not change test matrix or expedite program 6
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Status of Documents Cited at August Meeting
- Of 32 documents promised by inductry, 6 have not yet been received
--Of 17 documents requested by J. Gleason,9 have not yet been received i
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Status of Cable Testing Baseline CM Testing Completed October 1996
- XLPE/ Neoprene cables
- 16 new cables & 1 naturally aged cable l
Cables Shipped to Wyle Laboratories October 1996
- Preaging/LOCA testing j
Thermal Aging Initiated December 3,1996
- Aging parameters based on original qualification l
_ - 120 C for 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> to simulate 10 years of service for naturally aged cable
- 150 C for 650 hours0.00752 days <br />0.181 hours <br />0.00107 weeks <br />2.47325e-4 months <br /> to simulate 20 years of service for new cables l
l Cable Acquisition Ongoing l
- Contract placed with Plant B; cables to be removed in January 1997
- Contact made with Plant C; interested in participating l
- EPRl/U Conn f
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RESEARCH INFORMATION EXCHANGE MEETING WITH INDUSTRY ENVIRONMENTAL QUALIFICATION OF ELECTRIC CABLES Condition Monitoring Research Update Presented by: Bom Soon Lee i
Engineering Technology Division i
Department of Advanced Technology l
Brookhaven National Laboratory l
i January 8,1997
[
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(*!!al)
DAT i
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NEED FOR CONDITION MONITORING METHODS NRC/NRR Task Action Plan Identified the need for condition monitoring of qualified equipment to determine the actual conditions of installed plant equipment.
NRC/RES Program Plan States that one of the issues that must be addressed as part of EQ research program is to determine what condition monitoring techniques are useful for detecting and monitoring degradation in electric cables.
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WHAT DOES CONDITION MONITORING MEAN?
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Condition monitoring should be able to assess the current condition and predict LOCA survivability based on established acceptance criteria.
To accomplish this goal, the following information is needed:
1.
Review of CM methods to identify those that can generate data for evaluating current condition of a cable.
2.
Establishment of acceptance criteria using condition monitoring and l
LOCA test data.
OVERVIEW OF CONDITION MONITORING RESEARCH Primary Objectives Evaluate selected, promising CM methods for determining and monitoring cable condition i
Evaluate usefulness of CM methods for predicting remaining life and for assessing LOCA survivability i
.c OVERVIEW OF CONDITION MONITORING RESEARCH (Cont'd)
Secondary Objectives This research will generate data that will help resolve six remaining issues i
i Provide information on the condition of LOCA specimens at steps during preaging and LOCA simulation I
I
.c INSITU CM METHODS RECOMMENDED AFTER LITERATURE REVIEW (NOV.1994?
I Promising Readily Available Methods:
Indenter Oxidation induction Time (0.1. Time)
Oxidation Induction Temperature (0.1. Temp)
Density i
Fourier Transform infra-Red Spectroscopy (FTIR)
Dielectric Loss Time Domain Reflectometry (as Locator Technique) l Promising Developmental Methods l
l Small Angle X-Ray Diffraction (SAXD)
Electron Spin Resonance (ESR) t h
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POTENTIAL IN SITU CM METHODS FOR EVALUATION i
CM Methods selected based on Literature Review I
Oxidation induction time / temperature 1
Fourier transform infrared spectroscopy
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Indenter l
Time Domain Reflectometry j
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Dielectric Loss (AC Impedance) l 4
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.t POTENTIAL IN SITU CM METHODS FOR EVALUATION Low Cost, Easy-to-Perform CM Methods insulation Resistance
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Hardness Test l
Infrared Thermography Visual Inspection
~ Current Signature i
Electro-Magnetic Field Measurement 1
l f
b
t
.s CM METHODS TO BE USED Special CM Methods Functional Test Voltage Withstand Test Reference CM Method Elongation-at-Break (EAB) i t
.t CURRENT REDUCED SCOPE CM METHODS TO BE PERFORMED For Evsluation i
1.
Indenter 2.
Oxidation Induction Time / Temperature 3.
Fourier Transform Infra-Red Spectroscopy I
4.
Dielectric Loss 5.
Hardness Test 6.
Visual Inspection l
7.
Insulation Resistance Per IEEE Requirement 8.
Functional Test 9.
Voltage Withstand 3
For Reference i
10.
EAB l
e 4
CONDITION MONITORING TEST SEQUENCE FLOWCHART START Naturally Aged Cabic?
Yes STEP 1: le Situ CM 4
STEP 2: Cable Removal 4
STEP 3: Ship to BNL 4
STEP 4: CM Tests l
Artificial Aging Required? Ye STEP 5: Ship to Aging Lab 4
STEP 6: Thermat/ Radiation Aging 4
STEP 7: CM Tests 4
STEP 8: Radiation / Thermal Aging STEP 9: CM Tests I
LOCA qui ed?
No STEP 11: CMTests 4
STEP 12: Ship to LOCA Lab 4
l STEP 13: Accident Exposure 4
l STEP 14: Post 4.OCA CM Tests
~
i END
,h s
i Minutes of NRC Research Information Exchange Meeting IIeld February 12,1997 NRC-IIQ, Rockville, Maryland l
A meeting was held by the NRC Office of Nuclear Regulatory Research (RES) to obtain industry input on the ongoing research program for Environmental Qualification of Low-Voltage Instrumentation and 4
Control (I&C) cables. The focus of the meeting was the LOCA testing planned for this program. In addition to RES, participants in the meeting included representatives from the NRC Office of Nuclear Reactor Regulation (NRR), various nuclear industry representatives, DOE representatives, and representatives from.Brookhaven National Laboratory, the lead research lab for this program. A complete list of attendees is attached along with the meeting agenda. The following items wer(
discussed:
l Items Discussed:
1.
NRC opened the meeting stating that this was the second meeting with industry to discus the EO testing plans, and that the first, held January 8, was beneficial. The focus of this meet'ug was on the LOCA testing.
2.
A updated list of the EO documents still not received from industry was provided (attached), and I
these documents were requested by NRC. At the meeting, industry indicated that item 1 was not available, and item 2 was already faxed to NRC. The number of the Wyle test report in item 4 is incorrect and should be 17859. Excerpts were sent to BNL previously, however, BNL would like the entire report. This will be provided by industry. Item 3 will be provided by industry.
Items 6 and 7 were provided at the meeting.
i 3.
NRC provided an overview of the LOCA test program after which BNL provided a summary of the LOCA test plans, as well as detailed information on LOCA Run 1 (copy of viewgraphs i
attached). It was noted that the preaging parameters being used are based on Rockbestos Test Report No.1806, which is the original qualification basis for the cables. Rockbestos report 5805, which was published subsequent to 1806, includes the same test parameters, however, a lesser amount of margin was added to the aging time. Industry commented that the 1806 report was disapproved by the NRC and replaced by 5805, therefore, the newer 5805 report should be used i
as the basis for preaging parameters. BNL's position is that the cables should be preaged according to the 1806 report since it is the original basis for qualifying the cables. NRC will review this issue.
4.
In relation to the natural versus artificial aging comparisons included in the current plans, industry commented that the environmental data available from the plants for the naturally aged i
cables includes a great deal of uncertainty. It is felt that this will limit the usefulness of any comparisons with artificially aged cables. NRC acknowledges this, however, it was noted that the data obtained from the plants is the best available data and may still provide some insights into the artificial aging process. The uncertainties will be taken into account in the analysis, and will be discussed in the final report.
5.
The CM techniques to be performed on the cable samples were reviewed. It was noted that previous plans to consider including density measurements have been discontinued due to budget constraints. Sandia offered to perform density measurements on the BNL cable samples. NRC will consider this offer.
DISK: EOS File LOCAMM. MIN DATE: 2/13N7 1
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6.
It was noted that artificial aging of the cable samples to match the naturally aged cable will be performed at 120 *C This reduced temperature was selected to address industiy's concern that the aging temperatures selected were too high. It was recommended that the temperature be reduced further to approximately 100 *C to reduce oxidation diffusion effects. BNL will consider this for future tests.
7.
Industry also recommended that lower aging temperatures and dose rates be used for the samples to be CM tested since this would reduce oxidation diffusion concerns affecting the data. BNL noted that the issue of dose rate effects as they relate to the qualification process has been resolved by the previous literature review and will not be studied further in this program. The LOCA samples will be artificially aged at temperatures and dose rates as appropriate to accommodate the budget and schedule available for this program. However, small cable samples will be separately artificially aged and tested at BNL to address the issue of activation energies as part of this program. Since these samples will be aged independently from the LOCA samples, lower temperatures and dose rates can be accommodated without impacting the LOCA testing schedule. Therefore, BNL will obtain some data on low temperatures and dose rates which can be used to provide insights into their effects.
8.
It was noted that CM data will be obtained initially and after 20 years of artificial aging. The original plans to perform CM every 10 years has been modified. Industry commented that the indenter data will probably show a rapid jump in values since intermediary data points are not being taken. It was recommended that CM be performed at closer intervals. This will be considered for future testing.
9.
A question was raised by industry as to why CM will be performed half way through the accident irradiation at 75 MRads. It was explained that this will provide insights as to when cable properties degrade during the accident exposure, and whether the total 150 Mrad exposure is required. It will also provide information relevant to plants which have an accident requirement closer to 75 Mrad than 150 Mrad.
10.
BNL then presented an overview of the testing being performed for the multi-conductor issue.
Industry commented that they have recently put together a paper summarizing past work on multi-conductor cables which shows this i:: not an issue. NRC requested a copy of the paper and will review it. Ilowever, NRC currently considers the issue of multi-conductor cables an open issue.
j 11.
BNL presented an overview of the need for aging of cables to 60 years. Industry commented that this is not necessary since plants will not requalify cables for license extension by aging them to 60 years. Rather, they will ensure the cables have not exceeded the original 40 year qualification envelope by analyzing the actual environment the cables were exposed to and comparing it to the qualified service environment exposure. NRC noted that this has been discussed among the staff and they concluded that data on 60 year aging is necessary to provide insights into potential license extension options. Therefore, this testing will remain in the program.
Disk: EOS FILE: LOCAMTG. MIN DNIE: 2/13/97 2
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1 RESEARCll INFORMATION EXCIIANGE OPEN PUBLIC MEETING 4
i TOPIC:
En vironmental Qualification ofLow-Voltage I& C Cables DATE:
Wednesday, February 12,1997 LOCATION: NRC-IIQ Conference Room T-2 B3
Purpose:
To discuss theplansfor LOCA testing ofI& C cables i
j AGENDA
- 1. Opening Remarks NRC
- 2. Overview of Research Program NRC
- LOCA Tests To Be Performed
- Cables To Be Studied
- Ages To Be Simulated
- Status of Test Plans
- Status of Testing i
- Objectives Of Tests
- Basisfor Test Parameters
- LOCA Run # 1: Test Procedures
- 4. Industry Perspective on LOCA Testing
- 5. General Discussion i
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l Documents Not Yet Provided to BNL As-Of January 13,1997 f
[0 1.
Detroit Edison study on multiconductor cables.
Johnson, M.A.," Development and Qualification Testing of a Fire Retardant Class 1E Silicone 2.
Dioxide Insulated Electrical Cable," Operability of Nuclear Power Systems in Normal and Adverse Environments, Albuquerque, NM, September 29 - October 3,1986.
Rockbestos Qualification Test Report OR-7802," Report on qualification Tests for Rockbestos 3.
Firewall SR Generic Incident for Class 1E Service in nuclear Generating Stations."
9 Wyle Test Report 1785[-02,"Quall'ianon Yest Program on Raychem Nuclear Qualified Cable 4.
Splices, Okonite Tape Splices, and AMP Butt Splices," Commonwealth Edison, March 1987.
Patel Report No. PEI TR-850400-2," Final Test Report on Patel Engineers Conformal Coating,"
5.
Patel Engineers, December 21,1984.
6.
Okonite Test Report No.141.
7.
Okonite Test Report No. F-C-3694.
l 1
DISK: EQ7 11tI: EQDOC.15T DALE t/13N7 j
e Environmental Qualification Research Program of Low-Voltage I&C Cables
?
i Presented by:
Brookhaven National Laboratory February 12,1997 l
i i
i k
e Objectives of LOCA Testing j
i
- Address 4 Unresolved Issues
- Accelerated vs. Natural Aging
- CM to Predict Accident Survivability l
i
- Multi-Conductor Cable Failure Mechanisms I
i
- Bonded Jacket Cable Failure Mechanisms
Original Qualification j
+ Naturally Aged Samples were Certified to
)
Rockbestos Report 1806
+ Original Program:
- Thermal Aging 150 oC /1300 Hr.
i
- Radiation Exposure 50/150 MRAD
- LOCA : 346 oF,113 Psig, double peak Chemical Spray 7 days duration
i Test Specimens
+ 17 Ten Foot Long Cable Samples
)
- Simultaneous Monitoring Limitation
+ 12 Baskets of 6.25 inch long cable jacket j
and insulating materials with conductors removed 1
+ Insulation is Rockbestos Firewall III Irradiation Crosslinkec, XLPE
+ Jackets are Rockbestos Neoprene r
P h
Sample Aging i
+ 10 Year Old Natural Aged Samples No Additiona Aging
+ New / Unused Samples L
- None (Baseline):
- 2.86 Hours @ 120 oC (Equivalent Natura. agec atIndustry Recommenc.ec Lessened Severity)
- 650 Hours @ 150 oC 20 Yr Equivalent Rockbestos Rpt 1806 30 Yr Equivalent Rockbestos Rpt 5805
4 Radiation Exposure i
+ None
+ 0.6 MRAD l
1
+ 25 MRAD c
+ After Thermal Aging l
+ Accident Dose 150 MRAD (CM at 75 MRAD) t
[
+
.I c
Sample Mounting t
+ Naturally Aged Specimens
- Straight, Unistrut Secured i
+ Artificially Aged Specimens
- Straight, Unistrut Secured
- 20 X Mandrel
+ Raychem Splices Inside Chamber to Wyle 1
+ Basket Specimens l
6 LOCA Performance
]
+ Utilize Two Wire Shielded Transmitter Circuitry
+ Monitor
- Voltage i
i
- Current i
l Leakage Current l
[
5 i
1
( 'I LOCA Profile
+ 346 o F - 6 Hour (2 Peac)
+ 335 o F - 3 Hour i
+ 315 oF - 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> os f
+ 265 o F - 4 Days q;'
J
+ 212 o F - 3 Days o
'~
+ 113 Psig
+ Boric Acic.Chemica Spray @ Containment Requirement of 32 Psig
+ 7 Day Duration Test l
6 Post LOCA
+ Dielectric @ 80 VAC/ Mil
+ Maintain Mandrel Configuration No Uncoiling of Manc rel Specimens
+ Maintain Unistrut Configuration l
l l
l 1
l
6
(:
Condition Monitoring i
+ Prior to Delivery to Wyle
+ After 120 oC Aging i
+ After 150 oC Aging
+ After Aging Raciation Exposure
+ At Mic -point and Enc. of Accic ent Rac iation Exposures
+ Post LOCA, Post Dielectric
+ Ten foot Specimens returned to Rac.iation
+ Basket Specimens removed at each level
O Precautions
+ Dedicated Shippers
+ PVC Tubes for Shipping
+ Handling in Unistrut
+ Inside Chamber Splices to Prevent Differentia Pressure across Jacket to Conductor
+ Follow Original Qualification Program Test Conditions
+ Actual Plant Transmitter Load for Performance
,e
Future LOCA Tests
+ Identical Test Philosophy
+ Parameters will be Based on Original Qualification Certification i
60 Year Pre-Aging Objectives
+ Obtain LOCA Survivability Data
+ Evaluate Margin in 40 Yr Equivalent Degraded Condition
+ Investigate Licerise Renewal Options
t i
Multiconductor Cable Issue
+ NUREG/CR-3538,1983
+ Conclusion Dimensional Swelling Single Conductor Causes Stress in Specimens should not Multiconductor EPR Cables be Used to Establish ChemicalInteraction of Jacket and Insulation Qualification for Multiconductors Spiral Wound Dimensional Swelling Tensile Properties did not Predict Degradation I
s Multiconductor & Bonded Jacket Cab e
+ NUREG/CR-5772-1992
+ Anomalies:
+
Multiconductor Specimens -
- Kapton - 3 Handlino Anaconda, BIW & Dekoron -
m ge Dekorad
+ Conclusion
- Multiconductor &
Bonded Jacket Dekoron /
Jacket Interaction Effebts not Simulated with Dekorad (EPDM/CSPE)
Unjacketed Single n 13 Single Conductors OK Conductor Tests 40 Yr Multiconductor OK Jacketed Single Conductors
>;.10 & 60 Yr Not Representative of Multiconductor Gross Multiconductor Cables Failure L
)
.l i
I I
Research Information Exchange Meeting With Industry Environmental Qualification Of Electric Cables 1
l l
Presented by:
i t
l Satish Aggarwal Office of Nuclear Regulatory Research Rockville, Maryland f
February 12,1997 l
i
I i
l Overview of LOCA Testing 0
Original Program l
- 19 issues l
a
- 10 LOCA Runs i
l i
O Modified Program (if issues resolved by literature review) l l
- 6 issues
- 6 LOCA Runs t
k l
c i
i Cables to be Studied i
i l
t O
Three Types in Program 1
- XLPE/ Neoprene i
- EPR/Hypalon (unbonc.ed jacket) j
- EPR/Hypalon (bonded jac1et) i t
O One Type in LOCA Run 1
- XLPE/ Neoprene
l I
1 Ages Simulated in LOCA Run 1 1
l i
i Q
Unaged j
i
- to match aged cables 1
l 1
l 0
Naturally aged j
i l
- 10 years to match naturally aged
- 20 years t
l
~