3F0596-14, Corrects Info Provided by Util Re Reactor Coolant Pump Oil Collection Sys

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Corrects Info Provided by Util Re Reactor Coolant Pump Oil Collection Sys
ML20111B080
Person / Time
Site: Crystal River Duke energy icon.png
Issue date: 05/08/1996
From: Beard P
FLORIDA POWER CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
3F0596-14, 3F596-14, NUDOCS 9605140173
Download: ML20111B080 (2)


Text

9 Florida Power CORPORATION

. O Wd May 8, 1996 3F0596-14 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001

Subject:

Correction of Information on Reactor Coolant Pump 011 Collection System

Reference:

A. NRC to FPC letter, 3N0993-22, dated September 10, 1993 B. FPC to NRC letter, 3F0394-13, dated March 28, 1994 C. NRC to FPC letter, 3N1094-13, dated October 7, 1994

Dear Sir:

The purpose of this letter is to correct information provided by Florida Power Corporation (FPC)inReferenceB. In Reference A, the NRC solicited information regarding FPC's request for exemption to the oil collection system requirements of 10 CFR 50 Appendix R, Section 111.0. Specifically, NRC Request 4 asked for information to quantify the magnitude of a possible reactor coolant pump motor oil fire prcolem, including ventilation flow rates through the reactor coolant pump cubicles. FPC responded that, "The air flow through the 'D' rings is by convectiva force only. There is no installed forced air ventilation system."

This is incorrect in that the reactor building steam generator cooling system supplies forced ventilation to the 'D' rings below the reactor coolant pump motors. ibis error was discovered during a review of correspondence associated with the exemption request.

The steam generato cooling system supplies approximately 30,000 cubic feet per minute of air to each 'D' ring through ventilation ducts around the inside perimeter of the 'D' rings. The duct discharge registers are located approximately 16 feet above the reactor building floor (at elevation 95 feet).

The reactor coolant pump motor bases are located approximately 45 feet above the floor. Air flows upward through the 'D' rings and escapes from the open top of the compartments. Based on a cross sectional area of approximately 1230 square feet for each 'D' ring, and approximately 50% obstruction due to equipment, the vertical air velocity is estimated to be roughly 50 feet per minute.

140038 CRYSTAL nNER ENERGY COMPLEX: 15760 W. Power Une Street e Crystal River, Florida 3442B6706 e (352) 7954486 A Fhwida Progress Company 9605140173 960508 0 PDR ADOCK 05000302 I t0 P PDR

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[ , 'U. S. Nuclear Regulatory Commission 3F0596-14 Page 2 of 2 The NRC granted FPC the requested exemption in Reference C. No specific mention was made of the absence of forced ventilation in evaluating the safety aspects of the exemption. Due to the low ventilation flow rate and the absence of any cross flow to -cause dispersion of oil, the presence of the steam generator cooling system does not represent a significant contributor to fire severity.

Therefore, FPC considers that the original evaluation of the safety aspects of the exemption remain valid.

Sincerely, 4

AMM

. Beard, Jr.

Senior Vice President Nuclear Operations PMB/SCP:ff xc: Regional Administrator, Region 11 NRR Project Manager Senior Resident' Inspector 5

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