ML19322B976: Difference between revisions

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=Text=
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December 14, 1979
December 14, 1979
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==Dear 'ir. O'Reilly:==
==Dear 'ir. O'Reilly:==


          -
On September 10, 1979, a report wts made under the provisions of
On September 10, 1979, a report wts made under the provisions of
   *0 FE O.55(e) conce-ning the E.Prgency Diese! Generator Fan Cooling System.
   *0 FE O.55(e) conce-ning the E.Prgency Diese! Generator Fan Cooling System.
                                    -
During a review of equipment specifications and the subsequent analysis of.
During a review of equipment specifications and the subsequent analysis of.
local meteorological data, it was discovered that ambient temperature ranges exist which exceed the original design limits of the Fan Cooling System. This necessitates that seasonal blade pitch angle changes be made.
local meteorological data, it was discovered that ambient temperature ranges exist which exceed the original design limits of the Fan Cooling System. This necessitates that seasonal blade pitch angle changes be made.
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b      Sa:n C. Brown, Jr.
b      Sa:n C. Brown, Jr.
,                                    Senior Vice President - Power Static            nq Enginaering and Construction      1      '  n    D l                                                                            0 cc: Mr. Victor Stello, Directo-                                              U                r l Office of Inspection & Enforcement                          ( F)  D' 2
,                                    Senior Vice President - Power Static            nq Enginaering and Construction      1      '  n    D l                                                                            0 cc: Mr. Victor Stello, Directo-                                              U                r l Office of Inspection & Enforcement                          ( F)  D' 2
         !de. Harold R. Denton, Director                              (s
         !de. Harold R. Denton, Director                              (s i
                                                                      ._
pUJ
i pUJ
: k. A a Office of Nuclear Reactor Regulation 7 912200 39 l}}
                                                                              .
: k. A a
                                                                                              '
Office of Nuclear Reactor Regulation 7 912200 39 l}}

Latest revision as of 03:58, 1 February 2020

Final Deficiency Rept Re Emergency Diesel Generator Fan Cooling Sys.Ambient Temp Ranges Exist Exceeding Original Design Limits of Sys.Manufacturer Engineered Mod to Current Fan Drive Shaft to Allow Operation W/O Overloading
ML19322B976
Person / Time
Site: North Anna Dominion icon.png
Issue date: 12/14/1979
From: Brown S
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
747B, NUDOCS 7912200391
Download: ML19322B976 (1)
v • d • e


Text

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December 14, 1979

'4r. James P. O'Reilly, 01 ector Serial No. 7473 Office of Insoection & Enfore w art PSEEC/SCJ:me: wino U. S. 'luelea" Regulatory Commission Region II Docket No. 50-?to 101 '4arietta Street, Suita 3100 Atlanta, Georgia 30303

Dear 'ir. O'Reilly:

On September 10, 1979, a report wts made under the provisions of

  • 0 FE O.55(e) conce-ning the E.Prgency Diese! Generator Fan Cooling System.

During a review of equipment specifications and the subsequent analysis of.

local meteorological data, it was discovered that ambient temperature ranges exist which exceed the original design limits of the Fan Cooling System. This necessitates that seasonal blade pitch angle changes be made.

To eliminate this tiele consuming procedure, th6 manufacturer (Fairbanks Morse) engineered a modification to the current fan driva shaft coupling that will allow the Emergency Diesel Generator to operate throughout the year at a fixtd Slade pitch angle wit 50ut overloading the fan :' rive shaf t.

The above modification has been comoieteri on North Anna Units 1 t, 2 Emercancy Dies 31 G*rer1 tors and tha units satisf actonily tested in :lecordanca with t5e manufacturer's recommendations. It is also necessary to 'nake sassonal fluid coolant chinges. A 35 percent solution of ethylene glycol will be used +: ring the months when freezing could occur and treated water will be used during the sumer months for maximu'n cooling.

This letter is a final report on this subject. If additional information l is required for your review, please notify us. l Very truly yours, l i

l _

/$O2 h) >a ,

b Sa:n C. Brown, Jr.

, Senior Vice President - Power Static nq Enginaering and Construction 1 ' n D l 0 cc: Mr. Victor Stello, Directo- U r l Office of Inspection & Enforcement ( F) D' 2

!de. Harold R. Denton, Director (s i

pUJ

k. A a Office of Nuclear Reactor Regulation 7 912200 39 l
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