ML19263B386
| ML19263B386 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 01/12/1979 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19263B387 | List: |
| References | |
| 3--3-A-3, 3-0-3-A-3, NUDOCS 7901180177 | |
| Download: ML19263B386 (4) | |
Text
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coe W. P. STEWART, DIR ECTOR Mf POWER PRODUCTION
,n.onavin January 12, 1979 Mr. Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, DC 20555
SUBJECT:
Crystal River Unit 3 Docket No. 50-302 Operating Licence No. LPR-72 ECCS Small Breaks Analysis
Dear Mr. Reid:
Entiosed is the Single Failure Analysis of the Proposed Long Term ECCS Modification for the Small Break LOCA. The failure of each active component in the High Pressure Injection System was assumed with the Small Break LOCA and concurrent loss of of fsite power.
A diagram of an electrical transfer switch which FPC proposes to install in place of the mechanical trensfer switch described in Figure 4 of our letter of November 17, 1978, is also enclosed. Finally, a copy of the Gilbert Associates, Inc. study of the flow balance of one HPI pump and four HPI lines is included per the commitment of our November 7,1978 letter.
Please inform us of the results of your review of our proposed modification to the Engineered Safeguard System to mitigate the Condition III event (small LOCA) as soon as possible so that we may proceed with the installation. As stated in our letter of November 17, 1978 in Response #4, it will take approximately 31 weeks from NRC acceptance of our proposed modification until it can be fully installed.
Sincerely, FLORIDA POWER CORPORATIO
%UcMl W.P. Stewart Enclosures File:
3-0-3-a-3 RMBhlcT06 7 9 0118 01T1
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(1/10D3)
General Office 3201 Thirty-fourin street soutn. P.O. Box 14042. St. Petersburg, Florida 33733 e 813-866-5151
STATE OF FLORIDA COUNTY OF PINELLAS W.P. Stewart states that he is the Director, Power Production, of Florida Power Corporation; that he is authorized on the part of said company to sign and file with the Nuclear Regulatory Commiss3cn the information attached hereto; and that all such statements made and matters set forth therein are true and correct to the best of his knowledge, information and belief.
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S t'ewart Subscribed and sworn to before me, a Notary Public in and for the State and County above named, this 12th day of January, 1979.
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Notary Publir Notary Public, State of Florida at Large, My Commission Expires:
July 25, 1980
Single Failure Analysis of Proposed ECCS Modification for Small Break LOCA Assumptions: 1) Small Break LOCA is the passive failure
- 2) Concurent loss of offsite power
- 3) Must consider failure of each active component in the system Requirements: Must achieve at least the equivalent of 70% of the flow of one pump to the reactor in order to mitigate the accident. The following injection line pump configurations will result in at least the required flow:
4 lines with 2 pumps 4 lines with I pump 3 lines with 2 pumps 2 lines with 2 pumps Injection Lines and/or Active Component Failure Pumps Lost Adequate Flow Achieved by 1.
An Emergency Diesel 2 lines and I pump 4 lines an" oump (two Generator lines regain n by simple operator action of switching injection line valves from dead to live bus at between 10 and 20 minutes into the accident. No flow balancing is required).
2.
A DC Battery (results in Same as 1 Same as I loss of an Emergency Diesel Generator) 3.
An Engineered Safeguard Same as 1 4 lines and I pump (two Acutation Signal lines regained by simple operator action of opening the two injection valves whose signal was lost) 4.
A 4160V Engineersd Same as 1 Same as 1 Safeguard Bus 5.
A 4160V/480V Enginerred 2 lines 2 lines and 2 pumps Safeguard Transformer (No operator action necessar:.)
6.
A 480V Engineered Same as 5 Same as 5 Safeguard Bus 7.
An injection pump 1 pump 4 lines and I pump (no operator action necessary) 8.
An injection valve 1 line 3 lines and 2 pumps (no operator action necessary) 9.
Manual Transfer Switch None 4 lines and 2 pumps (no operator action necessary)
Bright (SmBrkLOCA)
(1/3D27)
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