ML072920547

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Draft RAI RA: Response to GL 2007-01
ML072920547
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 10/19/2007
From: Tam P
NRC/NRR/ADRO/DORL/LPLIII-1
To: Arias J, Loeffler R, Weinkam E
Nuclear Management Co
tam P, NRR/ADRO/DORL, 415-1451
References
IR-98-009, TAC MD4348
Download: ML072920547 (2)


Text

From: Peter Tam To: Edward J. Weinkam; Jesus Arias; Rick Loeffler Date: 10/19/2007 3:11:22 PM

Subject:

Monticello: Draft RAI re. response to GL 2007-01 (TAC MD4348)

Jay:

The NRC staff has reviewed your 5/7/07 response to GL2007-01 re. inaccessible or underground power cable failures that disable accident mitigation systems or cause plant transients. The NRC staff has determined that the following additional information is necessary to clarify the information that you provided in the response. Please contact me to set up a conference call to discuss the following draft RAI questions:

(1) The NRC staff has received the cable failure history for Monticello in response to GL 2007 01, "Inaccessible or Underground Power Cable Failures that Disable Accident Mitigation Systems or Cause Plant Transients." The licensee found a power cable failure within the scope of Title 10 of the Code of Federal Regulations (10 CFR), Section 50.65, Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants (Maintenance Rule (MR)). Specifically, the licensee found a power cable failure that occurred in 1997 in the 480V feeders to off-gas storage Motor Control Centers. In addition, NRC Inspection Report 50-263/98-09 discussed a previous failure of the cables feeding the off-gas storage building that occurred in 1994. Please provide the information requested in GL 2007-01 for the 1994 cable failure, or justify why it is not within the scope of the GL.

(2) In Corrective Action Program document CAP037776 and Condition Evaluation CE12033 for Monticello, the licensee discussed the testing failure of a recirculation motor generator set cable that was routed below the turbine building. Please provide the information requested in GL 2007 01 if the cable failure is within the scope of the GL, or justify why the failure is not within the scope of the GL.

Note that the NRC provided additional guidance on how licensees should determine which cable failures are within the scope of GL 2007 01 in the NRC letter dated April 13, 2007, from Michael J. Case (NRC) to James H. Riley of the Nuclear Energy Institute (NRC Accession No. ML070940311).

The sole purpose of this e-mail is to prepare you and others for the proposed conference call.

This e-mail does not convey a formal NRC staff position, and does not formally request for additional information. During the conference call, we will discuss disposition options of the above draft questions, e.g., whether to issue them formally or not.

Peter S. Tam, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation e-mail: pst@nrc.gov Tel.: 301-415-1451 CC: Audrey Klett; Jay Robinson

Mail Envelope Properties (4719015A.D6A : 12 : 35330)

Subject:

Monticello: Draft RAI re. response to GL 2007-01 (TAC MD4348)

Creation Date 10/19/2007 3:11:22 PM From: Peter Tam Created By: PST@nrc.gov Recipients Action Date & Time nmcco.com Transferred 10/19/2007 3:11:46 PM Edward.Weinkam (Edward J. Weinkam)

Jesus.Arias (Jesus Arias)

Richard.Loeffler (Rick Loeffler) nrc.gov OWGWPO04.HQGWDO01 Delivered 10/19/2007 3:11:27 PM ALK1 CC (Audrey Klett) Opened 10/19/2007 3:28:35 PM nrc.gov TWGWPO03.HQGWDO01 Delivered 10/19/2007 3:11:27 PM JER8 CC (Jay Robinson) Opened 10/19/2007 3:11:53 PM Post Office Delivered Route nmcco.com OWGWPO04.HQGWDO01 10/19/2007 3:11:27 PM nrc.gov TWGWPO03.HQGWDO01 10/19/2007 3:11:27 PM nrc.gov Files Size Date & Time MESSAGE 4143 10/19/2007 3:11:22 PM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard ReplyRequested: No Return Notification: None Concealed

Subject:

No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened