ML20040F287

Submits Results of Core Spray Sparger Clamp Installation & Vibration & Loose Parts Monitoring Sys

ML20040F287
Person / Time
Site:	Vermont Yankee
Issue date:	02/04/1982
From:	Jackson E VERMONT YANKEE NUCLEAR POWER CORP.
To:	Vassallo D Office of Nuclear Reactor Regulation
References
FVY-82-09, FVY-82-9, NUDOCS 8202090043
Download: ML20040F287 (2)

Text

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. VERMONT YAN KEE NUCLEAR POWER CORPORATION SEVENTY SEVEN GROVE STREET 2.C.2.1 RUTLAND. VERMONT 05701 FVY 82-09 REPLY TO:

ENGINEERING OFFICE 1671 WORCESTER ROAD FRAMINGH AM. M ASSACH US ETTS o17ol TELEPHONE st7 e72-eloo February 4 $* A 6

United States Nuclear Regulatory Commission & #D- -

Washington, D.C. 20555 . # -

Attention: Mr. Domenic B. Vassallo, Chief i

• f8 -9 Operating P3 actors Branch #2 ',. /8gk p

Division of Licensing '?,,

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Rcferences: a) License No. DPR-28'(Docket No. 50-271) /m b) Letter, VYNPC to USNRC, dated 12/1/80, Results of Core Spray Sparger Inspection c) Letter, USNRC to VYNPC, dated 1/15/81, Core Spray Sparger Program

Subject:

Core Spray Sparger Clamp / Vibration and Loose Parts Monitoring System In Reference (b), Vermont Yankee committe'd to implementing a surveillance program utilizing the Vibration and Loose Parts Monitoring System. This program was implemented as a result of installing a mechanical clamp on the junction box of. "C" core spray sparger.

Data was recorded quarterly for one year. A. spectral analysis of the recording was then performed to identify any major resonances. In addition, a comparison of the recordings at different time periods was also performed. As a result of the analyses, no anomalies were identi-fled and no shifts in frequency or amplitude of the vibration resonances

• occurred.

Following this analysis, the surveillance program and the Vibration and Loose Parts Monitoring System were evaluated to determine if any changes should be made to the program, and as a result:

1) Audible channel checks will continue to be performed on a daily basis, f fDOl S I O B202090043 820204 PDR ADOCK 05000271 p PDR

. e U.S. Regulatory Commission February 4, 1982 VERMONT YANKEE NUCLEAR POWER CORPORATION Page 2

2) No major maintenance or equipment replacement will be. per-formed. The Vibration and Loose Parts Monitoring System was installed as a prototype _ system and does not reflect state of the art technology. Uncertain future regulation and evolving technology does not at this time justify any major expenditures.

We trust this'information is satisfactory; however, should you have any questions, do not hesitate to call.

Sincerely, VERMONT YANKEE NUCLEAR m'0WER CORPORATION

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E.W. Jackson Manager of Operations EWJ/dm