ML19280D380

Special Report 2019-003 - RCS Subcooling Margin Monitor Inoperable

ML19280D380
Person / Time
Site:	Summer
Issue date:	10/07/2019
From:	Lippard G South Carolina Electric & Gas Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
19-388
Download: ML19280D380 (2)

Text

V. C. Summer Nuclear Station Bradham Blvd & Hwy 215, Jenkinsville, SC 29065

~ Dominion Mailing Address:

P.O . Box 88, Jenkinsville, SC 29065

iiiiiil" Energy Dominion Energy.com October 7, 2019 Attn

Document Control Desk Serial No.19-388 U. S. Nuclear Regulatory Commission VCS-LIC/JRB RO Washington, DC 20555-0001 Docket No. 50-395 License No. NPF-12 SOUTH CAROLINA ELECTRIC & GAS COMPANY VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) UNIT 1 SPECIAL REPORT 2019-003 - RCS SUBCOOLING MARGIN MONITOR INOPERABLE South Carolina Electric & Gas Company 1 is submitting this Special Report pursuant to the requirements of Technical Specifications (TS) 3.3.3.6 and 6.9.2. This report addresses one of the required Reactor Coolant System (RCS) Subcooling Margin Instrument Loop/Indicator monitoring channels being inoperable for more than thirty (30) days.

During calibration of RCS Subcooling Margin Monitor 'B', in accordance with Surveillance Requirement 4.3.3.6 (Table 3.3-1 O; 10, 12), it was identified that the monitor was inoperable for certain analog inputs. The monitor was declared inoperable on August 26, 2019.

The failure of RCS Subcooling Margin Monitor 'B' (ITM00499B) has been captured in the station's corrective action program (CR-19-03018) . The monitor's power supply and computer board assembly (AS card) have been shipped to an offsite vendor for troubleshooting and repair. While RCS Subcooling Margin Monitor 'B' is inoperable, RCS Subcooling Margin Monitor 'A' remains operable and is being used to monitor RCS subcooling . Additionally, an alternate method of monitoring is available via the plant process computer subcooling calculation .

The restored operability of RCS Subcooling Margin Monitor 'B' is tentatively scheduled for October 31, 2019 .

Should you have any questions, please call Michael S. Moore at (803) 345-4752.

George A. Lippard Site Vice President V.C . Summer Nuclear Station Commitments contained in this letter: None (1) In a letter dated July 30, 2019, South Carolina Electric & Gas Company (SCE&G) requested a License Amendment to amend the VC Summer operating license to reflect the name change from SCE&G to Dominion Energy South Carolina (DESC) . The amendment request is currently under review by the NRC .

Serial No.19-388 Special Report 2019-003 - RCS Subcooling Margin Monitor Inoperable Page 2of2 cc: G. J. Lindamood - Santee Cooper L. Dudes - NRC Region II S. A. Williams - NRC Project Manager NRC Resident Inspector