ML081930248

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Draft RAI Questions Recirculation Riser Differential Pressure Amendment, Instrumentation
ML081930248
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 07/10/2008
From: Tam P
NRC/NRR/ADRO/DORL/LPLIII-1
To: Blake T, Marcus B, Tony Nakanishi, Kerby Scales, Ward L
NRC/NRR/ADES/DE, NRC/NRR/ADES/DE/EICB, NRC/NRR/ADES/DSS, NRC/NRR/ADES/DSS/SNPB, Nuclear Management Co
Tam P
References
TAC MD6864
Download: ML081930248 (2)


Text

Accession No. ML081930248 From: Peter Tam Sent: Thursday, July 10, 2008 8:04 AM To: 'tmblake@nmcco.com'; 'Rick Loeffler (richard.loeffler@nmcco.com)'

Cc: Barry Marcus; Kerby Scales; Tony Nakanishi; Leonard Ward

Subject:

Monticello - Draft RAI re. Recirc. Riser Differential Pressure, Instrumentation (TAC MD6864)

Rick:

We are continuing our review of your license amendment request associated with Function 2.j, Recirculation Riser Differential Pressure - High (Break Detection) in TS 3.3, Emergency Core Cooling System Instrumentation, Table 3.3.5.1-1. By previous e-mails (3/18/03 and 3/27/08) I transmitted draft RAI questions generated by reviewers L. Ward and T. Nakaishi, and we are still waiting for response to those. Meanwhile, our Instrumentation and Controls Branch reviewers Kerby Scales and Barry Marcus have generated the following draft RAI questions; please set up a telephone conference with me to discuss these draft questions:

1. Setpoint Calculation Methodology: Provide documentation (including sample calculations) of the methodology used for establishing the limiting setpoint (or NSP) and the limiting acceptable values for the As-Found and As-Left setpoints as measured in periodic surveillance testing as described below. Indicate the related Analytical Limits and other limiting design values (and the sources of these values) for each setpoint.
2. For the Setpoint that is not determined to be SL-Related: Describe the measures to be taken to ensure that the associated instrument channel is capable of performing its specified safety functions in accordance with applicable design requirements and associated analyses. Include in your discussion information on the controls you employ to ensure that the As-Left trip setting after completion of periodic surveillance is consistent with your setpoint methodology. Also, discuss the plant corrective action processes (including plant procedures) for restoring channels to operable status when channels are determined to be inoperable or operable but degraded. If the controls are located in a document other than the TS (e.g., plant test procedure), describe how it is ensured that the controls will be implemented.

The sole purpose of this e-mail is to prepare you and others for the proposed telephone conference. With or without the conference, we plan to formally issue an RAI to you around July 25. Thus, this e-mail does not formally request for additional information or convey an NRC staff position.

Peter S. Tam, Senior Project Manager Plant Licensing Branch 3-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Tel. 301-415-1451 E-mail Properties

Mail Envelope Properties ()

Subject:

Monticello - Draft RAI re. Recirc. Riser Differential Pressure, Instrumentation (TAC MD6864)

Sent Date: 07/09/2008 5:45:32 PM Received Date: 07/10/2008 8:04:00 AM From: Peter Tam Created By: Peter.Tam@nrc.gov Recipients:

tmblake@nmcco.com ('tmblake@nmcco.com')

Tracking Status: None richard.loeffler@nmcco.com ('Rick Loeffler (richard.loeffler@nmcco.com)')

Tracking Status: None Barry.Marcus@nrc.gov (Barry Marcus)

Tracking Status: None Kerby.Scales@nrc.gov (Kerby Scales)

Tracking Status: None Tony.Nakanishi@nrc.gov (Tony Nakanishi)

Tracking Status: None Leonard.Ward@nrc.gov (Leonard Ward)

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 14440 07/09/2008 Options Expiration Date:

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