ML19326E050

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Comments on NUREG-0619, BWR Feedwater Nozzle & Control Rod Drive Return Line Nozzle Cracking. Disagrees W/Position Re Interference Fit Spargers.No Cracking of Nozzle Regions Experienced.Date of Dec 1985 Recommended for Sparger Mod
ML19326E050
Person / Time
Site: Vermont Yankee Entergy icon.png
Issue date: 07/18/1980
From: Rich Smith
VERMONT YANKEE NUCLEAR POWER CORP.
To: Snaider R
Office of Nuclear Reactor Regulation
References
REF-GTECI-A-10, REF-GTECI-RV, RTR-NUREG-0619, RTR-NUREG-619, TASK-A-10, TASK-OR WVY-80-103, NUDOCS 8007250488
Download: ML19326E050 (1)


Text

VERMONT YAN KEE NUCLEAR POWER CORPORATION SEVENTY SEVEN GROVE STRECT g 3,g,1 RUTLAND, VERMONT 057O1 WVY 80-103 REPLY 70.

ENGINEERING OFFICC July 18, 1980 TURNPlKE RO Ao WESTBORO. M ASS ACHUSETTS 01581 TELEPHONE 617 366 901I U"nited States Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Office of Nuclear Reactor Regulation Mr. Richard Snaider Generic Issues Branch Division of Safety Technology

Reference:

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

(2) Letter, USNRC to All BWR Licensees, dated June 5, 1980

Subject:

NUREG-0619 BWR Feedwater Nozzle and Control Rod Drive Return 4

Line Nozzle Cracking"

Dear Sir:

As requested by Reference (2), Vermont Yankee has reviewed the subject NUREG. We do not agree with your position concerning interference fit spargers. Since the replacement of our loose fit spargers in 1976, Vermont Yankee has experienced no cracking of the nozzle regions. This has been verified by both Liquid Penetrant and Ultrasonic inspections.

December We also do not agree with the Staff's position on the date selected, 31, 1982, for removing clad and replacing the interference fit spargers with triple sleeve spargers. As discussed at the January 1980 ACRS meeting of the Subcommittee on Metal Components, the equipment required to remove clad is_very sophisticated and very scarce. Also, there will be no inspection data available to document success of the triple sleeve design in an operating plant until 1983 at the earliest. As suggested at the above ACRS meeting, the date of December, 1985 is more appropriate for implementation of the sparger modification if s'u ch a modification is still required.

Vermont Yankee will be establishing a technical justification for the continued use of our interference fit spargers during the next several months, at the conclusion of which a formal response to NUREG-0619 will be submitted to the NRC.

If any questions arise, please do not hesitate to contact us.

Ve ry t ruly yours ,

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