ML19249C743
| ML19249C743 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 09/06/2019 |
| From: | Southern Nuclear Operating Co |
| To: | Office of New Reactors |
| Shared Package | |
| ML19249C738 | List: |
| References | |
| LAR-19-017, ND-19-0947 | |
| Download: ML19249C743 (4) | |
Text
Southern Nuclear Operating Company ND-19-0947 Vogtle Electric Generating Plant (VEGP) Units 3 and 4 Proposed Changes to the Licensing Basis Documents (LAR-19-017)
Note:
Added text is shown as Blue Underline Deleted text is shown as Red Strikethrough Omitted text is shown as three asterisks (This Enclosure consists of 4 pages, including this cover page)
ND-19-0947 Proposed Changes to Licensing Basis Documents (LAR-19-017)
COL Appendix C Changes COL Appendix C, Subsection 2.2.3, Table 2.2.3 Revise ITAAC 2.2.03.08b.01 as shown below.
Table 2.2.3-4 Inspections, Tests, Analyses, and Acceptance Criteria No.
ITAAC No.
Design Commitment Inspections, Tests, Analyses Acceptance Criteria 175 2.2.03.08b.01 8.b) The PXS provides core decay heat removal during design basis events.
- 1. A heat removal performance test and analysis of the PRHR HX will be performed to determine the heat transfer from the HX. For the test, the reactor coolant hot leg temperature will be initially at > 540 350°F with the reactor coolant pumps stopped running. The IRWST water level for the test will be above the top of the HX. The will continue until the hot leg temperature decreases below 430 is< 250°F.
- 1. A report exists and concludes that the PRHR HX heat transfer rate with the design basis number of PRHR HX tubes plugged is:
> 1.78 X 10^ 8.46 X 10^ Btu/hr with 530 250°F HL Temp and 802F an initial IRWST temperatures of 80°F.
^
1.11 X 10^ Btu/hr with 420"F HLTemp and 80°F IRWST transfer rate measured in the test should be adjusted to account for differences in the HL and IRWST temperatures and the number of tubes plugged.
UFSAR Changes UFSAR Subsection 1.9.4.2.1, TMt Action Plan Issues, Revise text as shown below.
I.G.I Training Requirements Discussion:
item 1.G.1 included the issue of natural circuiation testing for use as input Into operator training.
API 000 Response:
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ND-19-0947 Proposed Changes to Licensing Basis Documents (LAR-19-017)
For the API 000, natural circulation heat removal using the steam generators is not safety-related, as in current plants. This safety-related function is performed by the passive residual heat removal system. Natural circulation hoat removal via the passive residual heat removal the passive residual heat removal system meets the intent of the requirement to perform natural circulation testing and the results of this testing is factored into the operator training.
For the AP1000, the tests outlined below are contained in the AP1000 initial test plan and demonstrate the effectiveness of natural circulation cooling.
- 1. Not Used. During hot functional testing, prior to fuel load, with the reactor coolant pumps not running and offsite power not being usod for heat removal, the heat removal capability of the passive residual heat removal heat exchanger with natural circulation flow is verified (See
- 6. Data obtained from the first plant only natural circulation tests using the steam generators and PRFIR is provided for operator training on a plant simulator at the earliest opportunity.
Operating training for subsequont plants is also obtained while performing the hot functional PRHR natural circulation test described in item 1 abovo.
UFSAR Subsection 3.9.1.1.1.17, Passive Residual Heat Removal Test, revise as shown below.
During the initial test program hot functional testing with tho roactor coolant system in hot standby condition, the passive residual heat removal flow and heat transfer rates are tested.
Passive residual heat removal flow is initiated by opening the passive residual heat removal isolation valves. The passive residual hoat removal cools the reactor coolant system for up to 30 minutes. For component design purposes, the temperature and pressure responses to this testing are based on a conservative definition of the test conditions with a total of 5 occurrences.
UFSAR Subsection 6.3.6.1.2, Heat Transfer Testing, revise as shown below.
Initial verification of the heat transfer capability of the passive residual heat removal heat exchanger is performed by conducting a forced flow natural circulation test. This test is conducted during hot functional testing of the reactor coolant svstem and performed as described in Subsection 14.2.9.1.3 item q). Measurements of heat exchanger flow rate and inlet and outlet temperatures are recorded, and calculations are porformod to verify that the heat transfer performance of the heat exchanger is greater than that provided in Table 6.3-2.
UFSAR Subsection 14.2.9.1.3, Passive Core Cooling System Testing, revise as shown below.
The passive core cooling system emergency core decay heat removal function is verified by the following testing of the passive residual heat removal heat exchanger.
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ND-19-0947 Proposed Changes to Licensing Basis Documents (LAR-19-017) e) During hot functional testing of the reactor coolant system, the heat exchanger supply and return line piping water temperatures are recorded to verify that natural circulation flow initiates can initiate.
f) Not used. The hoat transfer caoabilitv of the passive residual heat removal heat exchanger is verified by measuring natural circulation flow rate and the heat exchanger inlet and outlet temperatures while the reactor coolant system is cooled to < '120°F. This testing is performed during hot functional testing with the reactor coolant system initial temperature s 5'10°F and the reactor coolant pumps not running. The acceptance criteria for the PRHR HX heat transfer under natural circulation conditions are that the heat transfer rate is
> 1.78 E-h08 Btu/hr based on a 520°F hot leg temperature and >1.11 E+08 Btu/hr based on ^20°F hot leg temperature with 80°F IRWST temperature and the design number of tubes plugged. These plant conditions are seloctod to be close to the expected test conditions and are different than those listed in Table 6.3-2. The PRHR HX heat transfer rate has been adjusted to account for these different conditions. The heat transfer rate measured in the test should be adjusted to account for differences in the hot leg and IRWST temperatures and number of tubes plugged.
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