ML19319C748
| ML19319C748 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 09/19/1973 |
| From: | Rodgers J FLORIDA POWER CORP. |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8003030861 | |
| Download: ML19319C748 (3) | |
Text
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Florida n.o..... n ~P wer September 19, 1973 cn d?
Mr. R.C. DeYoung
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RECElVED Assistant Director for Pressurized Water Reactors Directorate of Licensing 9-3EP241973 q1 Office of Regulation U.S. m; c ty,,y United Stated Atomic Energy Commission Con %'c.,
Washington, DC 20545 4
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IN RE:
FLORIDA POWER CORPORATI0fl A/
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CRYSTAL RIVER flVCLEAR GEffERATIf1G PLANT DOCKET f10. 50-302
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Dear Mr. DeYoung:
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As requested in your July 19, 1973, letter concerning overflow
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of the refueling water storage tanks into uncontrolled water pathways, we have reviewed the design of the Refueling Water Storage Tank (Borated Water Storage Tank) System and other liquid tanks which contain radioactivity at our Crystal River facility to determine if overflow or excessive leakage from these tanks could result in an uncontrolled release of radioactive liquid to the environs. The results of our review are as follows:
The Borated Water Storage Tank (BWST) serves two (2) major functions: emergency and normal.
Tie emergency function of the BWST is to supply borated water to the associated emergency safeguards systems (i.e.,
HPI, LPI, and Building Spray).
During this mode no administrative control is required relative to overflow j
due to the fact that the tank is being progressively drained, subsequently not filled. The normal function of the BWST is to supply borated water to the fuel transfer canal in preparation for fuel handling.
Water supply to the BWST which could result in overflow of sanie is via four (4) independent means as follows:
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.na.g 7111 General Othee 320s inirty fourth street souin. P o Box 14o42. sr Pete*Sburg Florida 33733 813 - 956 5151
Mr. R.C. DeYoung September 19, 1973 1.
8" dia. Decay Heat Removal System discharge. '
2.
8" dia. Spent Fuel Cooling System discharge.
4" dia.
3.
4" dia. Reactor Building Spray System recirculation.
4.
21/2" dia. Demineralized Water System supply.
The following analyses have been performed in order of overflow criticality relative to the above modes of filling the BWST.
1.
Following refueling the transfer canal is drained to the Reactor Vessel flange level by switching the discharge of one of the Decay Heat Removal pumps from the reactor injection nozzle to the BWST. The filling f
rate of the BWST by the Decay Heat pump is approximately
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3000 gpm.
The level instruments providing overflow protection for the BWST are duplicate level transmitters and a f
level switch. The transmitters indicate a rar.;;' of 0-50 ft. on E.S. Panels "A" and "B".
The level sw:tch s
actuates a high level alam in the control room when tank level reaches a height of 43 ft. The overall
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straight side height of the BWST is 47 ft. with an overflow connection located at 58 ft. - 5 in. The difference in height from the high level alarm to the overflow connection of 15 ft. - 5 in. corresponds to approximately 53,000 gallons. Therefore from the time of high level alam initiation to the overflow condition, at a filling rate of 3000 gpm, the operator is allowed approximately seventeen (17) minutes to take corrective action.
- 2.. Further draining of the fuel transfer canal is performed via one of the Spent Fuel Cooling System strings.
Under these conditions the discharge rate to the BilST is approximately 1500 gpm.
The tim required for an operator to take corrective action, thus preventing BWST overflow in this mode, is approximately thirty-four (34) minutes.
Items 3 and 4 of the above do not require extensive analysis due to the substantially increased relative time span concerned in order for corrective action to be initiated. Assuming that the BWST level indicators are not monitored and the BWST high level alarm fails, the BWST would overflow to i
the Auxiliary Building sump, which discharges to the d
miscellaneous waste storage tank, providing a controlled
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Mr. R.C. DeYoung September 19, 1973 water pathway to the environs.
BWST overflow to the Auxiliary Building sump would immediately initiate the sump pumping action and high level alarm.
In the event the following tanks, which could contain radioactive liquid, should experience an overflow condition due to level indication and/or alarm failure, the overflow effluent is discharged by way of a controlled water pathway to the environs.
1.
Reactor Coolant bleed tanks.
2.
Concentrated boric acid tanks.
5 3.
Concentrated waste storage tanks.
4.
Evaporator condensate storage tanks.
5.
Miscellaneous waste storage tank, Os 6.
Spent resin storage tank.
Also, review of our Operating procedures indicates that they sufficiently provide for operator surveillance and proper action concerning liquid storage tanks which contain radioactivity.
In summary, we are protected against an uncontrolled release of radio-active liquid to the env. irons due to an overflow of the refueling water storage tank systen or other tanks containing radioactive liquids at Crystal River Unit #3.
Very.truly yours,
J.
. Rodgers assistant Vice President JTR/ns G
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