ML101590809

Request for Additional Information Extended Power Uprate - Probabilistic Risk Assessment Review

ML101590809
Person / Time
Site:	Nine Mile Point
Issue date:	06/08/2010
From:	Richard Guzman Division of Operating Reactor Licensing
To:	Darling T Nine Mile Point
Guzman R, NRR/DORL, 415-1030
References
TAC ME1476
Download: ML101590809 (1)

Text

From: Guzman, Richard Sent: Tuesday, June 08, 2010 12:53 PM To: Darling, Theresa H Cc: Dosa, John J

Subject:

Follow-up RAI Question - Nine Mile Point Unit 2 EPU - Probabilistic Risk Assessment Review

Theresa, The NRC staff is reviewing the Nine Mile Point Nuclear Station, LLC (NMPNS or the licensee) license amendment request application dated May 27, 2009, and has determined that additional information requested below will be needed to complete its review in the probabilistic risk assessment (PRA) area. Below is the staffs request for additional information (RAI). The RAI was discussed with you on June 8, 2010, and it was agreed that your response would be provided within 30 days of the date of this request.

1. Section 2.13.1.3.2 of the submittal provides a brief explanation of the impact of EPU on fire ignition frequency for the NMP2 PRA. It states that frequency of fires is not dependent on reactor power or operation, however; it further states that there is a potential risk increase due to decrease in human reliability. The greatest increase in risk from EPU implementation derives from less time operators have to perform necessary actions. The EPU may not have an impact on Fire Ignition Frequency or Fire Mitigation; however, it may have an impact on operator actions after a fire has been identified and/or mitigated due to less available time.

Please provide additional information explaining the potential decreases in time related to operator actions for fire scenarios. Describe the potential risk increases due to decreases in human reliability for fire scenarios resulting from the proposed EPU implementation.

Thanks, Rich Guzman Sr. Project Manager NRR/DORL US NRC 301-415-1030 Richard.Guzman@nrc.gov E-mail Properties Mail Envelope Properties (92E0E77F3622DA40B501E8D45083D5D9508499C92D)

Subject:

Follow-up RAI Question - Nine Mile Point Unit 2 EPU - Probabilistic Risk Assessment Review Sent Date: 6/8/2010 12:53:01 PM Received Date: 6/8/2010 12:52:00 PM From: Guzman, Richard

Created By: Richard.Guzman@nrc.gov Recipients:

Theresa.Darling@cengllc.com (Darling, Theresa H)

Tracking Status: None John.Dosa@cengllc.com (Dosa, John J)

Tracking Status: None Post Office:

HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 11045 6/8/2010 Options Expiration Date:

Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: