ML11285A476
| ML11285A476 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 09/12/2011 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| Download: ML11285A476 (4) | |
Text
WBN2Public Resource From: Poole, Justin Sent: Monday, September 12, 2011 8:49 AM To: 'Crouch, William D'; Arent, Gordon
Subject:
Draft RAI questions relating to Appendix HH Open Item 80
- Bill, Below, for your review, are preliminary Request for Additional Information (RAI) questions regarding Watts Bar Nuclear Plant (WBN), Unit 2 Appendix HH Open Item 80. Please review to ensure that the RAI questions are understandable, the regulatory basis is clear, there is no proprietary information contained in the RAI, and to determine if the information was previously docketed. Please also let me know how much time Tennessee Valley Authority (TVA) needs to respond to the RAI questions.
Justin C. Poole Project Manager NRR/DORL/LPWB U.S. Nuclear Regulatory Commission (301)415-2048 email: Justin.Poole@nrc.gov CONTAINMENT HIGH RANGE RADIATION MONITORS As noted in the Safety Evaluation for the high range radiation monitors it was not clear how they meet the electromagnetic interference and radio frequency interface (EMI/RFI) requirement. After reviewing TVA standard specification SS-E18-14.1 staff requested actual test information pertaining to EMI/RFI. TVA provided EMI/RFI test reports by April 15, 2011 submittal. Attachment 1 of this report contained the test data with two sets of test reports; one by Nemko and the other by TUV. Nemko report is 89 pages and it addresses the updated RM1000 monitors whereas the TUV report tested the older RM1000 and I/F converter models.
After review, Staff requests the following clarifications and additional information.
- 1. TVA to provide the EMI/RFI test report for the updated I/F converter.
- 2. The following clarifications apply to Nemko test report 04509050 (89 pages):
i) TVA to confirm that the power supply part numbers 04502250-001 and the line filter/surge suppressor part number 50015670-001 are applicable to WBN2 (page 4 of 89). The test setup used two RM-1000 units and labels them as Channel 1 (Type I) and Channel 2 (Type II). TVA to confirm that both channels are the same because they both reflect part number 04501200-002 and that this part number is used for WBN2.
ii) Low Frequency Conducted Susceptibility Test: Please note that the Current revision of RG 1.180 (Rev 1), Figure 4.1 requires frequency range from 30 Hz to 150 kHz. Since the tested range for this test is from 30 Hz to 50 kHz, TVA is requested to justify the lower range or provide additional test data to cover the entire range. TVA to note that MIL-Std-461E also shows a range of 30 Hz to 150 kHz.
iii) High Frequency Conducted Susceptibility Test: IEC 1000-4-6 has been used. TVA to justify the equivalency between IEC 1000-4-6 and other approved test methods noted in RG 1.180 or EPRI TR-102323 (e.g. IEC 61000-4-6). TVA also to explain how this test meets EPRI TR-102323, Rev 2 or RG 1.180, Rev 1. TVA to note that Nemko report (page 65 of 89) does not provide the test 1
curves nor does it explain how the 10 Vrms is equivalent to the test levels required by EPRI 102323. TVA to clarify the range limits and provide test curves/data.
iv) Low Frequency Radiated Susceptibility Tests: According to Nemko test description (page 30 of 89 of the Nemko report) this test is to be conducted per RS101 with frequency ranges from 30 Hz to 100 kHz. Nemko test results (page 53 of 89) for RS 101 test indicate frequency from 3 Hz to 10 kHz. Test data results on page 31 of 89 state that the test results were in compliance with RS101 requirements of MIL-STD-461E. TVA to explain why the test data shown on Nemko report (page 53 of 89) shows a range from 3 to 10000 Hz as opposed to the required range of 30 Hz to 100 kHz (see test description on page 30 of 89). In addition the test should be conducted to the ranges specified in RG 1.180 or EPRI TR-102323 but the test data (page 53 of 89) shows test range 18 to 11 dBp. Please clarify how this test limit meets RG 1.180, Rev1 or EPRI TR-102323 (Rev 2) for range of 180 to 110 dBpT.
v) Surge Withstand Capability: RG 1.180 and EPRI TR-102323 provide the guidance for surge withstand capability tests. Both permit use of IEC 61000-4-5, Level 3 for this test. Nemko test report indicates that tests were conducted to IEC 1000-4-5 (page 64 of 89). Tests were performed to criterion B for 2kV common mode and 1kV differential mode surges in the AC power supply configuration using the combination wave method. RG 1.180, table 22 for combination wave for Category B, Low Exposure notes that the surge level is 2 kV / 1 kA. Nemko test report states compliant testing between neutral and ground for common mode at 2 kV, between line and ground for common mode at 2 kV, and between neutral and line for differential mode at 1 kV. TVA to explain the equivalency between IEC 1000-4-5 and other approved test methods noted in RG 1.180 or EPRI TR-102323 (i.e. IEC 61000-4-5). Further TVA to clarify how both parts of the combination wave form tests were conducted. RG 1.180, Rev1 requires an open circuit voltage and a short circuit test with surge current of 1 kA (see Figures 5.2 and 5.3). The test data (page 64 of 89) reflects that only voltage test was conducted.
vi) Electrical fast Transients Tests: RG 1.180 and EPRI TR-102323 provide the guidance for electrical fast transient tests. Both permit use of IEC 61000-4-4, Level 3 for this test. Nemko test report states that the guidance of test method IEC 1000-4-4 was used (page 40 of 89). The equipment was tested as Category B, low exposure power line. Nemko test results (page 63 of 89) for electrical fast transients state that the basic standard is EN-61000-4-4. Is TVA taking any credit for this test for WBN2? If so then please explain the equivalency between the actual test method used (i.e. IEC 1000-4-4 or EN 61000-4-4) and other approved test methods noted in RG 1.180 or EPRI TR-102323 (i.e. IEC 61000-4-4).
vii) Low Frequency Conducted Emissions Tests: Purpose of CE-101 test is to prove that the low frequency conducted emissions do not exceed the specified limits. EPRI TR-102323, Figure 5-4 for AC and DC source voltages above 28 volts specify a range of 110 dBµA from 30 Hz to 1 kHz and then linearly decreasing to 90 dBµA at 10 kHz. Nemko test results (page 45 of 89) shows very similar test requirements. However, the Nemko test data (page 45 of 89) starts from about 120 Hz as opposed to 30 Hz. TVA to justify why the test data did not start from lower limit of 30 Hz.
viii) Low Frequency Radiated Emissions Tests: Per Nemko report (page 52 of 89) this test was conducted per MIL STD-461E RE101 method. RG 1.180 also agrees with RE101 method and shows test requirements which are very similar to the Nemko test. The test passed with respect to the requirements. However, the margin at 64180 Hz is only 3.1 dBpT. This margin is very small.
NRC safety evaluation for EPRI TR-102323, dated April 17, 1996 suggested a safety margin of 8 dB which was eventually incorporated in Rev 1 of EPRI TR-102323. TVA is requested to justify why this small margin of 3.1 dBpT is acceptable for WBN2 .
ix) High Frequency Radiated Emissions Tests: Per Nemko report (page 48 of 89) this test requirement is to perform this test from 30 MHz to 230 MHz at 40 dBµV/meter with frequency range from 230 MHz to 1 GHz at level varying linearly from 40 dBµV/meter to 47 dBµV/meter using EN 55022, Class A method with an antenna distance of 10 meters for open area test site. The test data graph 2
shows actual tests from 30 MHz to 320 MHz with acceptable results. However, EPRI recommended curve in Figure 5-7 of EPRI TR-102323 shows limit values varying from 95 dBµV/meter to 66 dBµV/meter. It also states that EN 55022 Class A or B is acceptable if the highest clock frequency is 200 MHz. EPRI TR-102323 also states that this test should be performed up to 1 GHz or 5 times the highest internal generated frequency within the test unit.
Further RG 1.180 in section 3.6 states, Figure 3.5 shows all of the acceptable testing programs and notes that the alternative programs are acceptable only when the conditions for exemption are satisfied. Thus, when the identified conditions for exempting low frequency emissions testing are met, any of the three alternative emissions testing programs may be selected. However, regardless of the emissions testing program selected, it is intended that each be applied in its entirety, without selective application of individual methods (i.e., no mixing and matching of test methods) for emissions testing. The baseline group in Figure 3.5 lists CE101, CE102, RE 101, and RE102 as test methods. TVA uses CE101, CE102, and RE 101 but not RE102. RG 1.180, as noted above, states that mixing and matching of these methods should not be used. TVA to justify why RE102 has not been used for this test. TVA also to explain why the EN 55022 test is acceptable and how it meets the guidance of ERI TR-102323 or RG 1.180.
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Hearing Identifier: Watts_Bar_2_Operating_LA_Public Email Number: 521 Mail Envelope Properties (19D990B45D535548840D1118C451C74DA9202147CC)
Subject:
Draft RAI questions relating to Appendix HH Open Item 80 Sent Date: 9/12/2011 8:48:54 AM Received Date: 9/12/2011 8:48:00 AM From: Poole, Justin Created By: Justin.Poole@nrc.gov Recipients:
"'Crouch, William D'" <wdcrouch@tva.gov>
Tracking Status: None "Arent, Gordon" <garent@tva.gov>
Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 9041 9/12/2011 8:48:00 AM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
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