ML20212G873
| ML20212G873 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 02/25/1987 |
| From: | Hunsader S COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 2768K, NUDOCS 8703050424 | |
| Download: ML20212G873 (3) | |
Text
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} Cominenwealth Edloon i
One First Nabonal Plaza. Chca00 tilinois
\\\\s'/ Address Reply to: Poet Omco Box 767 Chicago,itinois 60600 0167 February 25, 1987 Mr. Harold R. Denton, Director
' Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Braidwood Station Units 1 and 2 Final Safety Analysis Report Revisions NRC Docket Nos. 50-456 and 50-457 References (a): Byron /Braidwood FSAR Amendment 47.
(b): NUREG-1223, Technical Specifications dated October, 1986.
(c): Facility Operating License NPF-59, dated October 17, 1986.
Dear Mr. Denton:
The purpose of this letter is to provide your office with an updated response to reference (a) FSAR Question 040.108 and is intended to serve as an advance notification of the change as noted in Attachment A.
This is to be included in the next FSAR amendment and is being submitted for early NRC review.
Braidwood Station intends to perform a 100 hour0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> reliability run on both Unit 1 diesel generators. Section 3.8.1.1.b.2 of reference (b) requires a minimum of 44,000 gallons of fuel in the Fuel Oil Storage System to ensure operability. The Unit 1 Fuel Oil Storage System consists of two 25,000 gallon tanks per diesel. As currently stated, in FSAR Question 0,40.108, when refilling one tank from the second tank, a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> settling time must be maintained. This time criteria would not allow maintenance of the 44,000 gallon Technical Specification criteria during the runs and would not allow the completion of the 100 hour0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> runs without rendering the affected diesel generator inoperable, due to insufficient fuel supply, soM I
I 8703050424 870225 PDR ADOCK 05000456 P
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.H. R. Denton
. February 25, 1987 To ensure continued diesel generator operabilit'y during the perform-
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ance of.these reliability runs, Braidwood Station proposes to maintain the
- l contained volume of the' Fuel Oil Storage System at greater than 44,000 gallons by slowly filling the storage tanks periodically and maintaining the individual tank volumes at greater than 50%..It has been determined that this controlled manner of filling the tanks in conjunction with a minimum contained volume of 44,000 gallons plus the use of 5 micron filters in the fill line is sufficient to avoid excessive turbulence at the bottom of the i
tanks,.thus meeting Regulatory Position C.2.g of Regulatory Guide 1.137, Rev.
1.
Should you have any further questions, please contact this' office.
Very truly yours,
{f
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S. C. Hunsader Nuclear-Licensino Administrator la cc:
J. A. Stevens - NRR Region III Inspector - Braidwood Regional Administrator - RIII I
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2768K
t y-B/B-FSAR
. AMENDMENT 36 JANUARY 1982 QUESTION 040.108
" Assume an unlikely event has occurred requiring operation of a diesel generator for a prolonged period that would require replenishment of fuel oil without interrupting operation of the diesel generator.
What provision has been made in the design of the fuel oil storage fill system to' minimize the creation of turbulence of.the sediment in the bottom of the storage tank.
Stirring of this sediment during addition of new fuel has the potential of causing the overall quality of the fuel to become-unacceptable and could potentially lead to the - degradation or failure of the diesel generator. "
RESPONSE
A filter has been provided on the fill lines to the diesel oil storage tanks.
The filters are rated 5 micron, 98%
removal.
In addition, filters have been provided on the discharge of each diesel oil storage tank transfer pump.
The rating of those filters is also 5 micron, 98% removal.
In order to minimize turbulence of the sediment in the bottom of the-storage tanks during addition of new fuel while the engine is in operation, the following procedure will be followed for Unit 1.
The twin diesel oil tanks supplying the Unit' 1 emergency diesels, during prolonged periods of operation, will be replenished by refilling one tank with the other tank in service.and allowing the refilled tank --
1 for-Q hours J M s c % u.V s e.~+a n '! it app ty ooly w
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+sik.~+a b e-nessed h al k c *-n se 4 s eass H. e. Sch ince the17i~iT 2 die 5els have only one tank per diesel, the above procedure cannot be followed.
Minimization of turbulence in the Unit 2 tanks will be accomplished by providing a Lg#j flow distributor inside each tank on the fill line.
7 This (f
flow distributor will consist of a section of pipe capped
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at the end, projecting approximately 12 inches into the tank, and containing a multiple number of holes.
The flow distributor will act to minimize turbulence by distributing the flow of new fuel oil over a large surface area in the i
tank.
l s
Q40.108-1 i
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