ML11271A165

NRR E-mail Capture - Additional MUR RAI (EEB)(ME6169)

ML11271A165
Person / Time
Site:	Harris
Issue date:	09/28/2011
From:	Mozafari B Division of Operating Reactor Licensing
To:	Caves J Progress Energy Co
References
TAC ME6169
Download: ML11271A165 (3)

Text

1 NRR-PMDAPEm Resource From:

Mozafari, Brenda Sent:

Wednesday, September 28, 2011 2:19 PM To:

Caves, John Cc:

Saba, Farideh

Subject:

Additional MUR RAI (EEB)( ME6169).docx Importance:

High

John, By letter dated April 28, 2011 (Agencywide Documents Access and Management System Accession No. ML11124A180), Carolina Power & Light Company requested approval from the U.S. Nuclear Regulatory Commission (NRC) to increase the core thermal power level of Shearon Harris Nuclear Power Plant, Unit 1 from 2,900 megawatts thermal (MWt) to 2,948 MWt, an increase of approximately 1.66% over the present licensed power level and to change the power plant technical specifications accordingly.

The staff has reviewed the supplemental information provided by the licensee in letter dated August 31, 2011 (ADAMS Accession No. ML11255A132). Based on our review of the response, the staff requests the following additional information:

1. In response to the staffs RAI number 9, the licensee stated in the last paragraph that the existing isophase bus will require increased cooling to accommodate the increase in Megawatt Electric (MWe). The licensee further stated that the plant will implement a modification to the isophase bus duct cooling during the planned spring 2012 refueling.

Provide the proposed isophase bus duct ampere rating at the increased cooling, and demonstrate that the rating is adequate for the increased MWe and Mega Volt Ampere Reactive at MUR power uprate conditions (corresponding to 1136.5 Mega Volt Ampere at 0.9547 power factor as provided in response the staffs RAI number 4).

2. In response to the staffs RAI number 2, the licensee stated that a software error was found that could result in an increase in the containment pressure and temperature for the loss-of-coolant accident (LOCA),

and that the environmental qualification (EQ) evaluations have been performed to show that the EQ programs existing test limits provide sufficient margin to address the increases that result from correcting mass and energy releases for the LOCA conditions.

Provide containment pressure and temperature profiles for the LOCA conditions before and after incorporation of the corrections necessary due the software error. Also, superimpose the bounding equipment EQ profiles to demonstrate adequate margin continues to exist.

3. In response to the staffs RAI Number 2, under the discussion of Radiation Environments to support Equipment Qualification, Accident and Normal Conditions, the licensee stated that the normal operation doses inside the containment reflect the increase in specific activity of N-16 and are based on a core power level of 2900 MWt, averaged over the 60-year plant life.

Describe the relationship between the rise in core power level and the rise in N-16 concentration. Also, describe the relationship between N-16 concentration and the normal operation radiation level considered for the qualification of electrical equipment inside containment.

The NRC staff is reviewing your submittal and has determined that additional information is needed to complete its review. It is requested that your RAI response be provided by October 21, 2011, as discussed with your staff on September 28, 2011. If more time is needed to respond to the RAl, your request for additional time should include a basis for the need for an extension

2 Brenda L. Mozafari Senior Project Manager, NRR/DORL U.S. Nuclear Regulatory Commission 301-415-2020 email: brenda.mozafari@nrc.gov

Hearing Identifier:

NRR_PMDA Email Number:

156 Mail Envelope Properties (Brenda.Mozafari@nrc.gov20110928141900)

Subject:

Additional MUR RAI (EEB)( ME6169).docx Sent Date:

9/28/2011 2:19:10 PM Received Date:

9/28/2011 2:19:00 PM From:

Mozafari, Brenda Created By:

Brenda.Mozafari@nrc.gov Recipients:

"Saba, Farideh" <Farideh.Saba@nrc.gov>

Tracking Status: None "Caves, John" <john.caves@pgnmail.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 3480 9/28/2011 2:19:00 PM Options Priority:

High Return Notification:

No Reply Requested:

No Sensitivity:

Normal Expiration Date:

Recipients Received:

ZZZ