ML23338A119
| ML23338A119 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 11/21/2023 |
| From: | Robert Kuntz NRC/NRR/DORL/LPL3 |
| To: | Steinman R Exelon Generation Co |
| References | |
| L-2023-LLR-0047 | |
| Download: ML23338A119 (3) | |
Text
From:
Robert Kuntz Sent:
Tuesday, November 21, 2023 10:45 AM To:
rebecca.steinman@constellation.com
Subject:
DRAFT Request for Additional Information RE: Quad Cities Relief Request I5R-26 (EPID L-2023-LLR-0047)
Ms. Steinman, By letter dated August 28, 2023 (ML23240A390), Constellation Energy Generation, LLC (Constellation, the licensee), submitted relief request I5R-26 to the U.S. Nuclear Regulatory Commission (NRC) regarding limited examination coverage of certain welds at the Quad Cities Nuclear Power Station, (QCNPS) Units 1 and 2. Specifically, pursuant to Title 10 of the Code of Federal Regulations (10 CFR) 50.55a(g)(5)(iii), the licensee requested relief due to the impracticality of satisfying the requirements of the American Society of Mechanical Engineers Boiler & Pressure Vessel Code (ASME Code),Section XI, Rules for Inservice Inspection of Nuclear\\Power Plant Components, because of the QCNPS, Units 1 and 2, plants design.
The NRC staff requests the included draft request additional information (DRAI) to complete its review of relief request I5R-26. If Constellation requires clarification on the DRAI contact me to set up a discussion. If no clarification is required, this DRAI will be considered a formal RAI the NRC will expect a response within 30 days of this message.
Robert Kuntz Senior Project Manager NRC/NRR/DORL/LPL3 (301) 415-3733 DRAFT REQUEST FOR ADDITIONAL INFORMATION RELIEF REQUEST I5R-26 CONSTELLATION ENERGY GENERATION, LLC QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 DOCKET NOS. 50-254 AND 50-265 EPID L-2023-LLR-0047 Regulatory Basis Adherence to Section XI of the ASME Code is mandated by 10 CFR 50.55a(g)(4), which states, in part, that ASME Code Class 1, 2, and 3 components will meet the requirements, except the design and access provisions and the pre-service examination requirements, set forth in the ASME Code,Section XI.
Inservice Inspection (ISI) of ASME Code Class 1, 2, and 3 components is to be performed in accordance with Section XI of the ASME Code and applicable edition and addenda as required by 10 CFR Section 50.55a(g), except where specific relief has been granted by the U.S. Nuclear
Regulatory Commission (NRC or the Commission) pursuant to 10 CFR 50.55a(g)(6)(i). 10 CFR 50.55a(g)(5)(iii) states in part that licensees may determine that conformance with certain code requirements is impractical and that the licensee shall notify the Commission and submit information in support of the determination.
Issue Table B of Attachment 1 to the submittal stated that five recordable indications were detected in the QCNPS, Unit 2, Top Head-to-Flange weld (Component ID RPV-THHF) during the Q2R24 outage. This table stated that the flaw sizes showed no evidence of growth from previous examinations, that the indications are bounded by the existing analytical evaluation, and that these five recordable indications were evaluated as acceptable. However, the description of the examination of the subject weld on page 37 of Attachment 3 to submittal described the five recordable indications as unacceptable to the requirements of IWB-3000. Therefore, the disposition of the five recordable indications is not clear. It is not clear whether the existing analytical evaluation that bounds the indications is a flaw evaluation performed per IWB-3600 of the ASME Code,Section XI, as required by the code.
Request a) Clarify the disposition of the five recordable indications detected in the QCNPS, Unit 2, Top Head-to-Flange weld (Component ID RPV-THHF) during the Q2R24 outage.
b) Clarify the basis for the disposition in Part a, including how the five indications are bounded by the existing analytical evaluation, as stated in Table B of Attachment 1 to the submittal, and whether this analytical evaluation was performed per IWB-3600 of the ASME Code,Section XI.
Hearing Identifier:
NRR_DRMA Email Number:
2328 Mail Envelope Properties (SJ0PR09MB10897C1C41385C3D9A11F889699BBA)
Subject:
DRAFT Request for Additional Information RE Quad Cities Relief Request I5R-26 (EPID L-2023-LLR-0047)
Sent Date:
11/21/2023 10:45:16 AM Received Date:
11/21/2023 10:45:00 AM From:
Robert Kuntz Created By:
Robert.Kuntz@nrc.gov Recipients:
"rebecca.steinman@constellation.com" <Rebecca.Steinman@constellation.com>
Tracking Status: None Post Office:
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