ML19344E485

Responds to IE Bulletin 80-17, Failure of 76 of 185 Control Rods to Fully Insert During Scram at Bwr. Mods Made to Existing Vent Lines So That Valve Is Effective Regardless of Component Operability Other than Vent Valve

ML19344E485
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	07/28/1980
From:	Tribble J VERMONT YANKEE NUCLEAR POWER CORP.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-80-17, IEB-80-17-S2, WVY-80-109, NUDOCS 8009020113
Download: ML19344E485 (2)

Text

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.a.. y y VERMONT YAN KEE NUCLEAR POWER CORPORATION SEVENTY SEVEN GROVE STREET ,

RUTLAND, VEltMONT 05701 WY 80-109 REPLY TO:

ENGINEERING OFFICE TURNPlKE RO AD WESTE^ORO M ASS ACHUSETTS 01581 TELEPHONE 617-366 .011 July 28, 1980 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Mr. Boyce H. Grier, Director

References:

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

(b) USNRC Letter to VYNPC dated July 22, 1980; IE Bulletin 80-17, Supplement 2

Subject:

Response to IE Bulletin 80-17, Supplement 2 Reference (b) delineates certain actions to be taken by BWR licensees and subsequent reporting requirements. The following inf.ormation is sub-mitted on behalf of Vermont Yankee:

Item 1:

"Each BWR licensee with a SDV vent system that depends on any component other than the vent valve alone for proper venting must provide an alternative vent path continuously open to building atmosphere on the side of the vent valve piping away from the SDV. This alternate vent f

I path must be positive in its function at all times (i.e. , a vent must be effective regardless of component operability other than the vent valve).

Plants have made corrections by providing a vent through a standpipe open to building atmosphere. This was done at Browns Ferry Unit No. 3 and is being done at Dresden Units 2 and 3. It is noted that due consideration to radiological aspects should be included.

An alternate vcnt pr.Lh must be provided within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> following the telephone notification on July 19, 1980 in order to continue or commence operations."

Response

I Modifications have been made to the existing vent lines such that the l vent is " effective regardless of component operability other than the i

! vent valve." The internals of the inline check valves were removed to I

S009020 N l

r United States Nuclear Regulatory Commission July 28, 1980 ,

Attention: Mr. Boyce H. Crier, Director Page 2 provide an open path to che reactor building ventilation exhaust plenum.

This modification was discussed with the resident inspector prior to implementation and it was concluded that the Bulletin requirement was satisfied.

The modification described above was implemented within the prescribed 48-hour time frame.

The following inf ormation is submitted in response to your request for estimates of manpower expended in the research and subsequent performance of actions associated with this Bulletin Manpower Requirements Hours Bulletin Response 10 Corrective Actions 15 k'e trust that the above supplied information is satief r,ctory; however, should you desire additional information, please contact us.

Very truly yours, VERMONT YANKEE FUCLEAR P0k'ER CORPORATION f

k , g ._ (~

J. E. Tribble

• -' Vice President l

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