NL-14-078, Post Accident Monitoring Report on Inoperable Condensate Storage Tank Level Transmitters
| ML14188B448 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 06/20/2014 |
| From: | Robert Walpole Entergy Nuclear Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NL-14-078 | |
| Download: ML14188B448 (2) | |
Text
Indian Point Energy Center E~
- r450 Broadway, GSB P.O. Box 249 Buchanan, N.Y. 10511-0249 Robert Walpole Regulatory Assurance Manager 914-254-6710 June 20, 2014 NL-14-078 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11545 Rockville Pike Rockville, MD 20852
SUBJECT:
Post Accident Monitoring Report on Inoperable Condensate Storage Tank Level Transmitters Indian Point Unit Number 2 Docket No. 50-247 License No. DPR-26
Dear Sir or Madam:
The purpose of this letter is to submit a report pursuant to Technical Specification (TS) 5.6.6 (Post Accident Monitoring Report) for two channels of Condensate Storage Tank (CST) Level Transmitters (LT) inoperable for greater than the TS allowed completion time. TS 3.3.3 [Post Accident Monitoring (PAM) Instrumentation], Table 3.3.3-1, for Function 14, CST level require two operable channels. The CST LTs are a Type A, Category I function that is provided to ensure water supply for the Auxiliary Feedwater System (AFWS). The CST provides a safety grade water supply for the AFWS. The operability of the CST is determined by maintaining the tank level at or above the minimum required level. The CST is the initial source of water for the AFWS. However, as the CST is depleted, manual operator action is necessary to replenish the CST or align suction of the AFW pumps to City Water.
On June 3, 2014, shortly after a nearby lighting strike, the Unit 2 Control Room noticed that the CST level transmitters LT-1 128 and LT-1 128A were failed high. At approximately 17:30 hours, operations entered TS 3.3.3 Condition C for one or more functions of Table 3.3.3-1 with two or more required channels inoperable for an inoperable Function 14. Required Action C.1 is to restore all but one channel to operable in 7 days. Operations also entered TS 3.3.4 (Remote Shutdown) for not meeting Function 3.e on TS Table 3.3.4-1 with required Action A.1 to restore the function to operable in 30 days. On June 10, 2014, CR-IP2-2014-03463 recorded that the inoperable CST LTs (LT-1 128 and LT-1 128A) associated with Limiting Condition for Operation (LCO) 3.3.3 exceeded the requirement to be returned to operable within 7 days.
Docket No. 50-247 NL-14-078 Page 2 of 2 TS 3.3.3 Condition D, required action and associated completion time of Condition C not met requires entry into TS 3.3.3, Table 3.3.3-1 for the channel. TS Table 3.3.3-1 Function 14 (CST level) reference condition is Condition F. TS 3.3.3, Condition F requires a report be submitted to NRC within the next 14 days pursuant to TS 5.6.6. The report is to outline the alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the instrument to operable status.
Alternate method of monitoring While CST LTs LT-1 128 and LT-1 128A were inoperable, Special Log 2-14-054 was established to take local level indication readings from LIC-1 102S twice a shift.
" Cause The apparent cause of the inoperability of LT-1 128 and LT-1 128A was an electrical failure of the level transmitters due to the effects of a nearby lighting strike. The condition was recorded in the Indian Point Corrective Action Program (CAP) as condition report CR-IP2-2014-03388.
Plans and schedule for restoring The plan for restoring the level transmitters was to rebuild transmitter LT-1 128A with available parts under Work Order (WO) 00384578, and replace the Foxboro transmitter for LT-1128 with a NUS transmitter under WO 00387575. On June 16, 2014, LT-1128A was declared operable after refurbishment. The LT-1 128 transmitter was replaced and returned to operable on June 18, 2014, restoring CST level indication. TS 3.3.3 and TS 3.3.4 were exited on June 18, 2014, at 15:45 hours.
If you have any questions or require additional information, please contact me.
Sincerely, RW/cbr cc:
Mr. Douglas Pickett, Senior Project Manager, NRC NRR Mr. William M. Dean, Regional Administrator, NRC Region I NRC Senior Resident Inspectors Office Mr. John B. Rhodes, President and CEO, NYSERDA Mrs. Bridget Frymire, New York State Dept. of Public Service