ML17293A429

Pre-Application Meeting October 23, 2017

ML17293A429
Person / Time
Site:	Monticello
Issue date:	10/23/2017
From:	Xcel Energy
To:	Robert Kuntz Plant Licensing Branch III
Kuntz R, NRR/DORL/LPLIII, 415-3733
References
Download: ML17293A429 (11)

Text

Monticello Nuclear Generating Plant Pre-Application Meeting October 23, 2017 License Amendment Request to Remove Technical Specification Operating Mode Restrictions for Emergency Diesel Generator Surveillance Testing 1

Meeting Purpose

• Describe a future license amendment request

• Establish a common understanding of the scope of the request

• Establish a common understanding of the schedule

• Obtain NRC feedback 2

Scope of Request

• Proposed change is to remove the mode restriction from the notes for SRs 3.8.1.7 and 3.8.1.9 to allow performance of the SRs in Mode 1 or 2

• Reason for proposed change is to obtain operational flexibility in the planning, coordinating and performing of the SRs 3

Current Licensing Basis

• Technical Specification SRs 3.8.1.7 and 3.8.1.9 are summarized as:

- SR 3.8.1.7: Requires demonstrating that the EDG can reject its single largest load without the EDG output frequency exceeding a specific limit

- SR 3.8.1.9: Requires starting and then running the EDG continuously at, or near, full-load capability for greater than or equal to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />

• Both SRs contain a note which states:

This Surveillance shall not normally be performed in MODE 1 or 2. However, this Surveillance may be performed to reestablish OPERABILITY provided an assessment determines the safety of the plant is maintained or enhanced.

Credit may be taken for unplanned events that satisfy this SR.

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Current SR 3.8.1.7 Markup 5

Current SR 3.8.1.9 Markup 6

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Background===

• EDGs are original plant equipment supplied in accordance with NSPMs understanding of AECs Proposed General Design Criteria 24 and 39

• Each EDG is a General Motors, Electro-Motive, 20 cylinder, 3950 brake horsepower, heavy duty turbocharged diesel engine directly coupled to a 2500 kW, 3125 KVA at 0.8 power factor, 4160 VAC, three phase, 60 Hz synchronous type generator

• Origins of the SRs:

- These SRs were not historically part of the MNGP licensing basis

- Introduced during Improved Technical Specification conversion, Amendment 146, issued June 5, 2006 7

Basis

• Any grid disturbances would only affect one EDG at a time because only one will be paralleled to offsite power or generator output at one time

• Online risk management considerations ensure SRs are not scheduled during periods where there is increased potential for grid or bus disturbances

• Conducting the SRs in any mode would not impact the performance of the onsite AC electrical system

• EDG emergency protective trip features active during testing 8

Basis (Continued)

• Review 10 years of past operating history has shown no instances of additional problems caused by starts of the EDGs to the EDGs themselves, other equipment, or the electrical grid, regardless of the mode in which the EDG was actually started. This includes testing of:

- SR 3.8.1.3, which demonstrates the EDG to be capable of synchronizing with offsite power online

- SR 3.8.1.7, which was performed online twice (once per EDG) to restore operability

• Industry precedent 9

Schedule

• Anticipate submittal December 2017 with a requested issuance of January 2019

• Implement in time to perform SRs prior to RFO 29 refueling outage beginning April 2019 10

Feedback

• Questions or comments?

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