ML17272A011

Request for Additional Information Regarding License Amendment Concerning Reactor Pressure Vessel Water Inventory Control

ML17272A011
Person / Time
Site:	Nine Mile Point
Issue date:	10/10/2017
From:	Marshall M Plant Licensing Branch 1
To:	Bryan Hanson Exelon Nuclear
Marhsall M, NRR/DORL/LPL, 415-2871
References
CAC MF9357
Download: ML17272A011 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 October 10, 2017 Mr. Bryan C. Hanson Senior Vice President Exelon Generation Company, LLC President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

NINE MILE POINT NUCLEAR STATION, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT CONCERNING REACTOR PRESSURE VESSEL WATER INVENTORY CONTROL (CAC NO. MF9357)

Dear Mr. Hanson:

By letter dated February 28, 2017 (Agencywide Documents Access and Management System Accession No. ML17059C963), Exelon Generation Company, LLC submitted a license amendment request for the Nine Mile Point Nuclear Station, Unit 2. The proposed amendment would revise the Nine Mile Point Nuclear Station, Unit 2, Technical Specifications by replacing existing requirements related to "operations with a potential for draining the reactor vessel" with new requirements on reactor pressure vessel water inventory control to protect Safety Limit 2.1.1.3. Safety Limit 2.1.1.3 requires reactor pressure vessel water level to be greater than the top of active irradiated fuel.

The U.S. Nuclear Regulatory Commission (NRC) staff has reviewed the information provided in that letter and has determined that additional information is needed to complete its review.

Enclosed is the NRC staff's request for additional information. The request for additional information was discussed with your staff on October 3, 2017, and it was agreed that your response would be provided within 30 days from the date of this letter.

If you have any questions, please contact me at 301-415-2871 or Michael.Marshall@nrc.gov.

Sincerely, Michael L. Marshall, Jr., Senior Project Manager Plant Licensing Branch I Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-410

Enclosure:

Request for Additional Information cc w/

Enclosure:

Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION NINE MILE POINT NUCLEAR STATION, LLC EXELON GENERATION COMPANY, LLC NINE MILE POINT NUCLEAR STATION, UNIT 2 DOCKET NO. 50-410 By letter dated February 28, 2017 (Agencywide Documents Access and Management System Accession No. ML17059C963), Exelon Generation Company, LLC submitted a license amendment request for the Nine Mile Point Nuclear Station, Unit 2. The proposed amendment would revise the Nine Mile Point Nuclear Station, Unit 2, Technical Specifications (TSs) by replacing existing requirements related to "operations with a potential for draining the reactor vessel" with new requirements on reactor pressure vessel (RPV) water inventory control to protect Safety Limit 2.1.1.3. Safety Limit 2.1.1.3 requires reactor pressure vessel water level to be greater than the top of active irradiated fuel.

The U.S. Nuclear Regulatory Commission staff has determined that additional information is needed to complete its review of the request.

Requests for Additional Information (1) In Table 3.3.5.2-1 (page 2 of 2), "RPV Water Inventory Control Instrumentation, of the TS markup, the "Manual Initiation" Function is designated "3.f." In the last sub-bullet on page 5 of the application, it is implied that the "Manual Initiation" Function should be designated as "3.e." Clarify whether the designation for the "Manual Initiation" Function in Table 3.3.5.2-1 of the TS markup is "3.e" or "3.f ."

(2) In TS markup, the Limiting Condition for Operation 3.3.5.2, "RPV Water Inventory Control instrumentation," Condition E has two Required Actions. The first Required Action is designated "E.1." The other Required Action, which states, "Restore channel to OPERABLE status," does not have a designation. What is the designation of the second required action?

(3) In Table 3.3.5.2-1 (page 1 of 2), "RPV Water Inventory Control Instrumentation," of the TS markup, the required channels per function for Function 2.a is "1 per pump." In the current version of the table in Nine Mile Point, Unit 2, TSs and the second bullet on page 4 of the application, the licensee states that the required channels per function for Function 2.a is "1 per valve." Also, "1 per pump" is an apparent variation from the TSTF-542, Revision 2, "Reactor Pressure Vessel Water Inventory Control." In the TS markup for TSTF-542, the required channels per function is "1." Clarify whether the required channels per function for Function 2.a in Table 3.3.5.2-1 of the TS markup is "1 per pump," "1 per valve," or "1." If the required channels per function is a variation from the TSTF, provide a discussion whether the variation affects the applicability of the TSTF.

Enclosure

(4) In Table 3.3.5.2-1 (page 1 of 2), "RPV Water Inventory Control Instrumentation," of the TS markup, the required channels per function for Function 1.d is "1." In TS markup for TST-542, the required channels per function is "1 per pump." The required channels per function of "1" is an apparent variation from TSTF-542, Revision 2, and no discussion concerning the applicability of the TSTF is included in the application. Clarify whether the required channels per function for Function 1.d in Table 3.3.5.2-1 of the TS markup is "1" or "1 per pump." If the required channels per function is a variation from the TSTF, provide a discussion whether the variation affects the applicability of the TSTF.

(5) In Table 3.3.6.2 (page 1 of 1), "Secondary Containment Isolation Instrumentation," of the TS markup, the third function is "Reactor Building Above the Refuel Floor Exhaust Radiation -

High." In the TS markup for TSTF-542, the third function is "Reactor Building Exhaust Radiation - High." The third function in the TS markup appears to be a variation from TSTF-542, Revision 2, and no discussion concerning the applicability of the TSTF is included in the application. Provide a discussion whether the apparent variation affects the applicability of the TSTF.

SUBJECT:

NINE MILE POINT NUCLEAR STATION, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT CONCERNING REACTOR PRESSURE VESSEL WATER INVENTORY CONTROL (CAC NO. MF9357)

DATED OCTOBER 10, 2017 DISTRIBUTION:

Public RidsNrrDorlLpl1 RidsRgn1 MailCenter RidsACRS_MailCTR RidsNrrLALRonewicz RidsNrrPMNineMilePoint RidsNrrDssStsb Resource RGrover, NRR DWarner, NRR ADAMS Access1on N um ber: ML17272A011 *b1y e-ma1*1 OFFICE DORL/LPL 1/PM DORL/LPL 1/LA DSS/STSB/BC* DORL/LPL 1/BC DORL/LPL 1/PM NAME MMarshall LRonewicz JWhitman JDanna MMarshall DATE 10/02/2017 10/02/2017 08/30/2017 10/10/2017 10/10/2017 OFFICIAL RECORD COPY