HNP-14-021, Planned Actions for Transformer Replacement
| ML14052A234 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 02/13/2014 |
| From: | Kapopoulos E Duke Energy Progress |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| HNP-14-021 | |
| Download: ML14052A234 (3) | |
Text
Ernest J. Kapopoulos, Jr.
DUKE Vice President Harris Nuclear Plant
- ENERGY, 5413 Shearon Harris Road New Hill NC 27562-9300 February 13, 2014 919.362.2000 Serial: HNP-14-021 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Shearon Harris Nuclear Power Plant, Unit 1 Docket No. 50-400
Subject:
Planned Actions for Transformer Replacement Ladies and Gentlemen:
On January 28, 2014, during discussions of the Harris Nuclear Plant (HNP) 1D-2 Transformer failure which occurred on January 18, 2014, the NRC staff requested that Duke Energy Progress, Inc., provide a letter documenting HNP's transformer replacement plans and a description of compensatory measures in place to maintain the reliability of the onsite electrical power distribution system. The enclosure to this letter provides the requested information.
This letter contains no new Regulatory Commitments.
Please address any comments or questions regarding this matter to David Corlett, Regulatory Affairs Manager, at 919-362-3137.
Sincerely, Ernest J. Kapopoulos, Jr Enclosure cc:
Mr. J. D. Austin, NRC Sr. Resident Inspector, HNP Mr. A. Hon, NRC Project Manager, HNP Mr. V. M. McCree, NRC Regional Administrator, Region II
Serial HNP-14-021 Page 1 of 2 Enclosure Shearon Harris Nuclear Power Plant, Unit 1 Docket No. 50-400 Planned Actions for Transformer Replacement On January 28, 2014, during discussions of the Harris Nuclear Plant (HNP) 1D-2 Transformer failure which occurred on January 18, 2014, the NRC staff requested that Duke Energy Progress, Inc., provide a letter documenting 1) HNP's transformer replacement plans and 2) compensatory measures in place. The information below is provided in response to the NRC staff's request.
Response 1 - Description of Near-Term Planned Actions to Replace Transformers HNP intends to replace the following transformers in the time frames outlined below: 1A3-SA, 1B2-SB, 1D2, 1D1, and 1El.
Transformer 1A3-SA is scheduled to be replaced in the next refueling outage, currently planned for spring of 2015.
Transformer 1 B2-SB is scheduled to be replaced in the next refueling outage, currently planned for spring of 2015.
A replacement for transformer 1 D2 has an approved purchase order, but is not yet delivered. HNP intends to replace the 1 D2 transformer in a mid-cycle planned outage.
The schedule for this outage has not yet been determined.
Replacement transformers 1 D1 and 1 El have approved purchase orders, but are not yet delivered. HNP intends to replace these transformers prior to the next refueling outage, currently planned for spring of 2015. HNP is evaluating if the replacement should be performed online or in a mid-cycle planned outage.
Serial HNP-14-021 Page 2 of 2 Enclosure Response 2 - Description of Compensatory Measures in Place Additional Monitoring Operations personnel are performing additional log readings on 6.9kv / 480 v station service transformers WA1, 1A2-SA, 1A3-SA, 1D1, 1D3, 1B1, 1B2-SB, 1B3-SB, 1E1, 1E2, and 1E3. Log readings include current and temperature with limits for notification of engineering personnel for further review.
Risk Insights As a precaution, risk associated with a higher than normal transformer failure rate has been incorporated into the daily site work schedule.
Risk Reduction Measures The Dedicated Shutdown Diesel Generator, 1 E2 transformer, circuit breaker and cross connecting circuit breaker to 1 D2 are protected.
During maintenance periods on the following five components, the other four components will be protected.
o Diesel Generator 1A-SA o
Diesel Generator 1 B-SB o
Turbine Driven Auxiliary Feedwater Pump o
DC Distribution Panel DP-1A-SA o
DC Distribution Panel DP-1 B-SB The schedule for upcoming maintenance on offsite power distribution components was reviewed to determine if the reliability of the distribution system could be improved by deferral of activities. This was evaluated on a case by case basis and resulted in the rescheduling of work on the A Startup Transformer.