ML19320C524

Forwards Response to IE Bulletin 80-06, Engineered Safety Feature (ESF) Reset Controls. All safety-related Equipment Remains in Emergency Mode Upon Reset of ESF Actuation Signal W/Listed Exceptions

ML19320C524
Person / Time
Site:	Vermont Yankee
Issue date:	06/13/1980
From:	Tribble J VERMONT YANKEE NUCLEAR POWER CORP.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-80-06, IEB-80-6, WVY-80-88, NUDOCS 8007170325
Download: ML19320C524 (2)

Text

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VERMONT YAN KEE NUCLEAR POWER CORPORATION SEVENTY SEVEN GROVE STREET B.4.1.1.

RuTLAso, VERMONT 05701 WVY 80-88 REPLY Toi ENGINEERING OFFICE

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June 13, 1980 WESTBORO, M ASS ACHUsETTS 01581 TELFPHONE f17 366 9018 U. S. Nuclear Regulatory Commission Office of Inspection 6 Enforcement Region I 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Boyce H. Grier, Director

References:

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

(b) Letter, Boyce H. Grier (USNRC) to R. L. Smith (VYNPC),

dated March 13, 1980

Subject:

Response to IE Bulletin No. 80-06, " Engineered Safety Feature (ESP) Reset Controls"

Dear Sir:

Reference (b) forwarded the subject bulletin which required a written response within 90 days. Vermont Yankee's response is contained in the enclosure to this letter.

We trust that this infomation will be satisfactory; however, should you have any questions, please contact us.

Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION 7&

J. E. Tribble Vice President Enclosure CO6NONWEALTH OF MASSACHUSETTS)

)ss COUNTY OF WORCESTER )

Then personally appeared before me, J. E. Tribble, who, being duly sworn, did state that he is a Vice President of Vermont Yankee Nuclear Power Corporation, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Vermont Yankee Nuclear Power Corporation, and that the statements therein are true to the best of his knowledge and belief.

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,e ic' R. H.' G(ocY My Commission Expires September 14, 1984

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Response - to NRC Bulletin IE 80-06, " Engineered Safety Features Reset Controls"

- Que.*cion 1: Upon review of the drawings at the schematio level for all systems serving safety-related functions, it has been determined that all associated safety-related equipment remains in its emergency mode upon the reset of any ESF actuation signal with the following exceptions:

(a) Valves 3B-1A and SB-1B of the standby gas treatment system (b) Gland Seal Condenser Blower of the HPCI System.

Question 2: To verify that the installed instrumentation and controls at Vermont Yankee are consistent with the schematics reviewed in Question 1, all necessary testing to demonstrate that all engineered safety feature equipment remains in its emergency mode upon removal of the actuation signal and/or manual reset of the system actuating signal will be completed by December 31, 1980.

Question 3: (ci No actions are planned to change the current status of valves SB-1A and SB-1B of the standby gas treatment system.

Upon reset of the primary contaiment isolation system, it is intended that the above mentioned valves should close.

In this way, the standby gas treatment system can more effectively vent the nigh pressure coolant injection (HPCI) condenser gland exhauster prior to final shutdown of the HPCI system and the opening of any PCIS valves.

(b) No actions are planned to change the c,urrent status of the HPCI system Gland Seal Condenser Blower.

After HPCI initiation has cleared, the HPCI system is not reset until the Gland Seal Condenser Blower has vented the Gland Seal Condenser, which leads to " Gland Seal Condenser Low Level", which shuts off the gland seal condenser blower. If the blower does not shut off on " low level" for any reason, HPCI reset shuts the blower off to prevent damage to the blower and/or condenser.

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