ML19050A220

NRR E-mail Capture - Draft NRC RAI for Oconee LAR 2018-05

ML19050A220
Person / Time
Site:	Oconee
Issue date:	02/14/2019
From:	Audrey Klett Plant Licensing Branch II
To:	Zaremba A Duke Energy Carolinas
References
L-2018-LLA-0300
Download: ML19050A220 (4)

Text

NRR-DMPSPEm Resource From: Klett, Audrey Sent: Thursday, February 14, 2019 11:23 AM To: Wasik, Christopher J Cc: Zaremba, Arthur H.

Subject:

RE: RE: Draft NRC RAI for Oconee LAR 2018-05 Hi Chris, The reviewer informed me that the LAR states: No other non-LOCA accidents that may result in departure from nucleate boiling (DNB) are considered (e.g., locked rotor accident, rod ejection accident, etc.). Fuel cycles for ONS are designed so that no fuel rod predicted to enter DNB will have been operated beyond the current limit in Footnote 11 for maximum LHGR. Because of this, the NRC would be approving a change to the gap fractions for the FHA only. The sentence pointing to in the email below is worded, none of these fuel pins, which refers to the non-DNB fuel pins that exceed the rod power/burnup criteria of footnote 11 in RG 1.183 and the new proposed gap fractions provided in this LAR, which applies to FHA only. The LAR doesnt clearly state that the fuel cycle design ensures that no fuel rod predicted to experience DNB in any other non-LOCA accidents will have operated beyond the power/burnup criteria of Footnote 11 in Regulatory Guide 1.183 and that the gap fractions used in these non-LOCA accidents analyses remain those stated in Table 3 of RG 1.183.

The sentence pointed out below clearly explains that the rods will not experience DNB following any DBA, but it does not clearly state that the gap fractions in the locked rotor and rod ejection accident remain those in Table 3 of RG 1.183 and that the exceeding the power/burnup criteria in Footnote 11 in RG 1.183 does not apply to these accidents.

Please let me know if a clarification call is needed. Ill revise the draft RAI with this information regardless.

From: Wasik, Christopher J [1]

Sent: Tuesday, February 12, 2019 3:55 PM To: Klett, Audrey Cc: Zaremba, Arthur H.

Subject:

[External_Sender] RE: Draft NRC RAI for Oconee LAR 2018-05

Audrey, The Oconee UFSAR already has a provision that may address the question (recall that we already had a similar gas gap fraction LAR approved). Please have the reviewer look at the UFSAR information included with the current LAR (excerpt below). The highlighted statement below may be what the reviewer is seeking. If not, then Im thinking we should schedule a call to discuss.

1

Chris From: Klett, Audrey [2]

Sent: Monday, February 11, 2019 4:05 PM To: Wasik, Christopher J <Christopher.Wasik@duke-energy.com>

Cc: Zaremba, Arthur H. <Arthur.Zaremba@duke-energy.com>

Subject:

Draft NRC RAI for Oconee LAR 2018-05

• • • Exercise caution. This is an EXTERNAL email. DO NOT open attachments or click links from unknown senders or unexpected email. ***

Hi Chris, Attached is a draft RAI for LAR 2018-05 (Fission Gas Gap Release Fractions). Please let me know by February 19th if the licensee will need a clarification call (if not, then whether the licensee can respond within 30 days of the final RAI version being sent to you).

FYI - Harris was asked a similar RAI for its LAR (NRC EPID # L-2017-LLA-0233).

-Audrey 2

Hearing Identifier: NRR_DMPS Email Number: 805 Mail Envelope Properties (Audrey.Klett@nrc.gov20190214112200)

Subject:

RE: RE: Draft NRC RAI for Oconee LAR 2018-05 Sent Date: 2/14/2019 11:22:58 AM Received Date: 2/14/2019 11:22:00 AM From: Klett, Audrey Created By: Audrey.Klett@nrc.gov Recipients:

"Zaremba, Arthur H." <Arthur.Zaremba@duke-energy.com>

Tracking Status: None "Wasik, Christopher J" <Christopher.Wasik@duke-energy.com>

Tracking Status: None Post Office:

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