ML18130A747

NRR E-mail Capture - Request for Information Monticello TSTF-542 License Amendment Request

ML18130A747
Person / Time
Site:	Monticello
Issue date:	05/09/2018
From:	Robert Kuntz Plant Licensing Branch III
To:	Sueper L Northern States Power Company, Minnesota
References
L-2017-LLA-0360
Download: ML18130A747 (3)

Text

NRR-DMPSPEm Resource From: Kuntz, Robert Sent: Wednesday, May 9, 2018 10:03 AM To: Sueper, Leonard L.

Subject:

Request for Information RE: Monticello TSTF-542 license amendment request Mr. Sueper, By application dated October 20 2017 (Agencywide Documents Access and Management System (ADAMS)

Accession No. ML17293A280), Northern States Power Company, Xcel Energy (NSPM, the licensee) requested to adopt Technical Specifications Task Force (TSTF) Traveler TSTF-542, Reactor Pressure Vessel Water Inventory Control, Revision 2, which changes the Technical Specifications (TSs) for the Monticello Nuclear Generating Plant (MNGP). Traveler TSTF-542, Revision 2, was approved by the U.S. Nuclear Regulatory Commission (NRC) on December 20, 2016 (ADAMS Accession No.ML16343B008).

MNGP TS Section 2.0, Safety Limits, 2.1.1.4 states; Reactor vessel water level shall be greater than the top of active irradiated fuel. Safety Limit 2.1.1.4 is maintained through the TS Limiting Condition of Operation (LCO), applicability, actions, and notes. The MNGP TSs require certain safety systems to be OPERABLE during operations with a potential for draining the reactor vessel (OPDRVs).

The proposed changes would replace existing TS requirements associated to OPDRVs with revised TSs providing an alternative requirement for Reactor Pressure Vessel (RPV) Water Inventory Control.

The staff has determined that additional information is required for the staff to complete its review. The following is the staffs request for additional information (RAI).

During a teleconference on May 8, 2018 between the Nuclear Regulatory Commission Staff and NSPM, which was conducted to provide clarification on the DRAFT RAI, NSPM stated that the license amendment request addressed the information related to the low pressure coolant injection system (LPCI). The staff reviewed the amendment request and verified the information sought was provided in the amendment request. Therefore, the following RAI has been modified from the DRAFT RAI by removing reference to LPCI.

As discussed during the May 8, 2018 teleconference, the NRC staff expects a response to the following RAI within 30 days, which is June 9, 2018. If NSPM cannot provide a response as requested contact me.

Robert Kuntz Senior Project Manager NRR/DORL/LPL3 (301) 415-3733 DRAFT REQUEST FOR ADDITIONAL INFORMATION APPLICATION TO REVISE TECHNICAL SPECIFICATION TO ADOPT TSTF-542, REVISION 2, REACTOR PRESSURE VESSEL WATER INVENTORY CONTROL NORTHERN STATES POWER COMPANY MONTICELLO NUCLEAR GENERATING PLANT EPID: L-2017-LLA-0360, DOCKET NO. 50-263 RAI: of the LAR proposes the following variation:

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f. NUREG-1433 Table 3.3.5.1-1, Function 1.d, Core Spray Pump Discharge Flow - Low (Bypass), is not included in the MNGP TSs. As a result, this function is not being included in TS 3.3.5.3, Reactor Pressure Vessel (RPV) Water Inventory Control, Table 3.3.5.3-1.

TSTF-542 moves the CS bypass requirements from standard technical specifications (STS) Table 3.3.5.1-1, Emergency Core Cooling System Instrumentation, to new STS Table 3.3.5.2-1, RPV Water Inventory Control Instrumentation. In particular, Section 3.3.4.2 of the TSTF-542 technical evaluation describes the purpose of this TS as:

The minimum flow instruments are provided to protect the associated low pressure ECCS pump from overheating when the pump is operating and the associated injection valve is not fully open. The minimum flow line valve is opened when low flow is sensed, and the valve is automatically closed when the flow rate is adequate to protect the pump.

As per the discussion contained in TSTF-542, successful RPV water inventory control is based, in part, on the capability of an operable ECCS pump to inject water as needed to make up the inventory. Sections 6.2.2.2.3 and 6.2.3.2.1 of the MNGP Updated Safety Analysis Report describe this protective function of the MNGP minimum flow rate instruments to signal automatically opening or closing the valves in the minimum flow bypass lines for the CS pumps. Furthermore, the presence or absence of a requirement in a current TS is not in and of itself justification for the proposed TS.

Request:

Since the proposed TSs have omitted the equivalent of the TSTF-542 instrumentation requirements for CS Pump Discharge Flow-Low (Bypass), describe how there is reasonable assurance that a required MNGP ECCS pump will operate as expected (e.g., the bypass line will not lessen expected discharge flow, and said pump will not overheat when the associated injection valve is not fully open).

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Hearing Identifier: NRR_DMPS Email Number: 364 Mail Envelope Properties (BN3PR09MB0417BA1111DE9E1279B05A9199990)

Subject:

Request for Information RE: Monticello TSTF-542 license amendment request Sent Date: 5/9/2018 10:02:57 AM Received Date: 5/9/2018 10:02:58 AM From: Kuntz, Robert Created By: Robert.Kuntz@nrc.gov Recipients:

"Sueper, Leonard L." <Leonard.Sueper@xenuclear.com>

Tracking Status: None Post Office: BN3PR09MB0417.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 4473 5/9/2018 10:02:58 AM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

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