ML19256F164

From kanterella
Revision as of 13:51, 18 October 2019 by StriderTol (talk | contribs) (Created page by program invented by StriderTol)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search
Responds to IE Bulletin 79-23.No Connection Between Circuitry of Diesel Generators & Neutral of Primary Windings & Exciter Power Transformer.Full Load Capacity Tests Revealed That Cooling Sys Operated within Design Limits
ML19256F164
Person / Time
Site: Vermont Yankee Entergy icon.png
Issue date: 10/29/1979
From: Groce R
VERMONT YANKEE NUCLEAR POWER CORP.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-79-23, NUDOCS 7911210563
Download: ML19256F164 (1)


Text

s VERMONT Y AN KEE NUCLEAR POWER CORPORATION SEVENTY sEVEN GROVE STREET B.4.2.1 WVY 79-126 RUTLAND, VERMONT 05701 REPL Y TO:

October 29, 1979 ENGINEERING OFFICE TURNP!KE RO AD WEsTBORO. M AssACHUsETTs 01581 United States Nuclear Regulatory Commission TELEPHONE 617-366-9011 Region I 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Boyce H. Grier, Director

References:

(1) License No. DPR-28 (Docket No. 50-271)

(2) USNRC I&E Letter to VYNPC dated September 12, 1979 (3) IE Bulletin No. 79-23

Dear Sir:

Subject:

Potential Failure of Emergency Diesel Generator Field Exciter Transformer The following information is provided in response to Reference (3):

Item-1 The circuitry of the diesel generators for Vermont Yankee has been examined and it has been determined that no connection exists between the primary windings of the exciter power transformer and the neutral of the generator.

Item 2 Each emergency diesel generator at Vermont Yankee has successfully completed a sustained full-load operation test.

The test consisted of operation at full-load capacity for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, of which 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> were at a load equivalent to the continuous rating of the diesel generator and 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> were at a load equivalent to 110% of the continuous rating of the diesel gen 2rator. The tests also verified that voltage and frequency requiremets were maintained and that the cooling system operated within design limits.

We trust that you will find this information satisfactory; however, should you desire additional information, please contact us.

Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION g6 / 4%

Robert H. Groce Senior Engineer - Licensing SFU/jgh 15 / 8 U./

7911210 b "