ML15236A033

Response to Request for Additional Information Regarding Proposed Relief Request to Utilize Code Case OMN-18

ML15236A033
Person / Time
Site:	Limerick
Issue date:	08/24/2015
From:	Jim Barstow Exelon Generation Co
To:	Document Control Desk
References
Download: ML15236A033 (4)

Text

200 ExeloP Way Exelon Generation Kennett Square. PA 19348 www.exeloncorp.

om 10 CFR 50.55a August24,2015 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

Subject:

Limerick Generating Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-39 and NPF-85 NRC Docket Nos. 50-352 and 50-353 Response to Request for Additional Information Regarding Proposed Relief Request to Utilize Code Case OMN-18 for Limerick Generating Station, Units 1 and 2

References:

1) Letter from J. Barstow (Exelon Generation Company, LLC) to the U.S. Nuclear Regulatory Commission, "Submittal of Relief Request to Utilize OMN-18," dated April 13, 2015 2) E-mail correspondence from R. Ennis (U.S. Nuclear Regulatory Commission) to T. R. Loomis (Exelon Generation Company, LLC), "Limerick Generating Station Units 1 and 2 -Draft Request for Additional Information Regarding Proposed Relief Request to Utilize Code Case OMN-18 (ML15202A378)," dated July 13, 2015 By letter dated April 13, 2015, Exelon Generation Company, LLC (Exelon) submitted a relief request to the U.S. Nuclear Regulatory Commission (NRC) for Limerick Generating Station (LGS), Units 1 and 2 (Reference 1 ). The relief request concerns the use of OMN-18, "Alternate Testing Requirements for Pumps Tested Quarterly Within +/-20% of Design Flow." In the Reference 2 e-mail correspondence, the U.S. NRC requested additional information.

Attached is our response.

Response to Request for Additional Information Relief Request to Utilize Code Case OMN-18 August24,2015 Page2 There are no regulatory commitments in this letter. If you have any questions concerning this response, please contact Stephanie J. Hanson at 610-765-5143.

Respectfully, James Barstow Director, Licensing and Regulatory Affairs Exelon Generation Company, LLC

Attachment:

Response to Request for Additional Information Regarding Proposed Relief Request to Utilize Code Case OMN-18 cc: USNRC Region I, Regional Administrator USNRC Senior Resident Inspector, LGS USNRC Project Manager, LGS R. R. Janati, Bureau of Radiation Protection ATTACHMENT Response to Request for Additional Information Regarding Proposed Relief Request to Utilize Code Case OMN-18 Response to Request for Additional Information Relief Request to Utilize Code Case OMN-18 Docket Nos. 50-352 and 50-353 Attachment Page 1 of 1 By letter dated April 13, 2015, Exelon Generation Company, LLC (Exelon) submitted a relief request to the U.S. Nuclear Regulatory Commission (NRC) for Limerick Generating Station (LGS), Units 1 and 2. The proposed relief request concerns the use of American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code) Case OMN-18, "Alternate Testing Requirements for Pumps Tested Quarterly Within +/-20% of Design Flow." The NRC staff has determined that additional information is needed to complete its review. The specific request for additional information (RAI) is restated below along with Exelon's response.

Question 1: Code Case OMN-18 has a note that states, "Subsection ISTB allows the Owner to categorize the pumps in their program. As such, an Owner could categorize a pump that otherwise meets the requirements of Group B, as a Group A pump, and test according to this Code Case. However, in doing so they are obtaining additional data (vibration and flow or differential pressure) quarterly, rather than once every 2 yr." Confirm that the pumps listed in Section 1, "ASME Code Component(s)

Affected," of the relief request that are categorized as Group B pumps, will be re-categorized as Group A pumps. Response:

Limerick Generating Station (LGS), Units 1 and 2, intends to follow the Code Case as written. Pumps which are presently classified as Group B pumps, in which OMN-18 is invoked, will be re-classified as Group A pumps.