ML052080095

E-mail Ennis, NRR, to Gucwa, Entergy Nuclear Northeast, Et. Al., VY EPU GE Audit

ML052080095
Person / Time
Site:	Vermont Yankee
Issue date:	07/21/2005
From:	Richard Ennis Office of Nuclear Reactor Regulation
To:	Gucwa L Entergy Nuclear Northeast
References
Download: ML052080095 (3)

Text

Rick Ennis - Topics of Discussion for GE Vallecitos Audit on 8/15-8/16 Page 1.

From: Rick Ennis To: Brian Hobbs; Craig Nichols; Len Gucwa Date: 7/21/05 12:57PM

Subject:

Topics of Discussion for GE Vallecitos Audit on 8/15-8/16 As followup to our call today, attached are EMEB's topics of discussion for the audit at steam dryer scale model GE in Vallecitos on 8/15-8/16.

thanks, Rick CC: Jim DeVincentis; Ronda Daflucas

I cAtemP\GW)00001.TMP Page 1 -l I c:tm\WOQO .TM . Pag 1 Mail Envelope Properties (42DFD414.CD2: 11: 372)

Subject:

Topics of Discussion for GE Vallecitos Audit on 8/15-8/16 Creation Date: 7/21/05 12:57PM From: Rick Ennis Created By: RXE@nrc.gov Recipients Action Date & Time entergy.com bhobbs (Brian Hobbs) cnichol (Craig Nichols) jdevinc CC (Jim DeVincentis)

LGUCW90 (Len Gucwa) rdafluc CC (Ronda Daflucas)

Post Office Delivered Route Pending entergy.com Files Size Date & Time MESSAGE 625 07/21/05 12:57PM TOPS TO BE DISCUSSED WITH GE AND ENTERGY.wpd 12352 07/21/05 12:39PM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard Reply Requested: No Return Notification: None Concealed

Subject:

No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened

TOPICS TO BE DISCUSSED WITH GE AND ENTERGY DURING AUDIT AT GE VALLECITOS FACILITY PERTAINING TO THE SCALE MODEL TEST

1. Validation of the scale model test results against the available in-plant test data, the scaling method of pressure amplitude and the effect of medium properties at elevated pressure and temperature on the excitation source strength and on sound attenuation in the full-scale plant.

2. Applicability of the small-scale model to the VYNPS, including details of main steam piping and other secondary piping, water-steam interface, upstream and downstream boundary conditions as well as the degree of geometry simplification in the model, e.g.

dryer vanes and main steam isolation valve.

3. Measurement methodology pertaining to locations of microphones and strain gauges, interference of measuring sensors with the flow, phase between different signals as function of frequency, proper orthogonal decomposition of pressure signals to understand excitation sources, and flow visualization.

4. Benchmark testing of the acoustic circuit method, including tests with and without flow or sound excitation, method of introducing external sound excitation, effect of flow rate and intensity of applied sound, and reasons for selecting the test conditions of benchmark testing.

5. Source screening test results and how the knowledge gained from these tests can be used to solve the dryer problem.

6. Comparison of the CFD simulation to the small-scale model results.

7. Effects of test pressure on the amplitude of pressure oscillations.