ML20064D462

From kanterella
Jump to navigation Jump to search
Forwards Rept on short-circuiting Test of Svc Water Reservoir Conducted on 780714-15 Prior to Main Thermal Performance Test of Sys.Results in Agreement W/Previous Analyses
ML20064D462
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 11/03/1978
From: Brown S
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: Harold Denton, Parr O
Office of Nuclear Reactor Regulation
Shared Package
ML20064D468 List:
References
NUDOCS 7811070146
Download: ML20064D462 (1)


Text

_. ~ ~ ~ . . _ . . _ . . ~ _ . _ . ._...;___ _ . . . . - _ . . ._

, -, hC-3hh

  • y-)Cj l VepCO __. _ ... _e_ _._. _ . - -

November 3,1978 Mr. Harold R. Denton, Director Serial No. 237C Office of Nuclear Reactor Regulation

~

PSE&C/RLR:bep/mc Attention: Mr. O. D. Parr, Chief Light Water Reactors Branch No. 3 Docket Nos. 50-338 ' /

Division of Project Management 50-339 - O U. S. Nuclear Regulatory Comission License No. NPF-4 Washinton, D..C. 20555

Dear Mr. Denton:

The possibility of short-circuiting the North Anna Service Water Reser-

~

voir.. Spray System has been under study for some time.

Our letter of June 2, 1978 (Serial No. 237A) transmitted the results of an analytical study of the effectivenessoftheServiceWaterReservoir(SWR)pumphouseintakestructure in resisting this type of condition. This study was performed by 'the Ralph M.

Parsons Laboratory at the Massachusetts Institute of Technol.ogy (MIT). ,

The MIT study indicated that at design conditions over four hours would be required for an appreciable change to' occur in t..e temperature of the water reachi.ng the pump intake. This would mean that over one third of the volume of the SWR would have to be circulated through the system before an appreciable increase in water temperature occurred at the intake.

A short-circuiting test was conducted on July 14 and 15 of this year prior to the main thermal performance test of the North Anna Service Water Reservoir spray system.. The report on this short-circuiti.ng test is sub-mitted with this letter for your information.

The results of this test are in agreement with the previous analyses of the system. The design of the SWR pumphouse is effective in resisting short-circuiting. The test results combined with the analytical studies of the SWR pumphouse provide a sufficient basis to conclude that short-cir-cuiting to the detriment of the plant will not occur.

Work is continuing on the data reduction and analysis of information ob-tained during the thermal performance testing of the SWR spray system. We will submit a thoro. ugh report on this test and the thermal performance capa- i bilities of the spray system at the completion of all data analysis work. I Please contact us if you should require additional information.

1 Very uly 7811070lO /,

g. /

r/dsay /

ToWH, P. /

cePresident-Powergttion Enclosures (40) ngineering and Construc ion cc: Mr. James P. O'Reilly, Director Office of Inspection & Enforcement -

Region II

., -