ML19317G569
| ML19317G569 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 08/08/1973 |
| From: | Rodgers J FLORIDA POWER CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8003191144 | |
| Download: ML19317G569 (3) | |
Text
_.
s
,. g-.
6 i-I Letter from Florida-Power Corporation, J. T. Rodgers, AUG 1.9 F/3 50-302 - ROB 73-2
.. dated August 8, 1973 cc w/ encl:
l H. D. Thornburg, RO RO:HQ - (4)
Directorate of Licensing A)
DR Central Files PDR Local PDR NSIC
-OIS, OR 4
e
.~
O e
e i
a s:
83 8003191l44
'*fW+
-c*
w y
y
,m
~,. -
g
c 3
w
, m)(Da cV
^
$'d, J 3 f)
OJlC )llh5'
'Oc33d Flc)ridha August 8,1973 Power Compomarsom The Director Directorate of Regulatory Operations Region II - Suite 818 230 Peachtree Street, Northeast Atlanta, GA 30303 IN RE: FLORIDA POWER CORPORATION CRYSTAL RIVER NUCLEAR GENERATING PLANT DOCKET NO. 50-302
Dear Sir:
As requested in your July 13, 1973 letter concerning Directorate of Regulatory Operation - Bulletin No. 73-2, 'Halfunction of Ceatainment Purge Supply Valve Switch," we have reviewed the design of the control circuit for the containment ventilation system isolation valves installed at our Crystal River facility to determine whether the failure of a single control switch could result in the simultaneous failure of the redundant supply valves or relundant exhaust valves. The results of our review are as follows:
References:
GAI Flow Diagram BS-302-76 GAI Log!c Diagrams AH-23, 24, 24A (S-203-005)
AH-25,,25A, 26 GAI Elementary Diagrams AH-35, 24, 25 (B-208-005)
AHV-1A and AHV-10, the outside Reactor Building Containment Purge Valves, are operated by dual solenoids which are energized to open and f ail closed. In the event that a switch contact block would fail causing the valves to 'emain energized and an RB isolation r
signal was initiated, the valve would close
~
since the RS isolation signal is in series with the switch and opening the circuit anywhere causes the valve to close.
In addition, there are local pushbuttons near the valve to open or close the valve if required..The normal switch 8
is located on the ES section of the control board.
L v
O
~
e The Director Augus t 8, 1973 AHV-1B and AHV-1C, the inside Reactor Building Containment Purge Valves are operated by motor operated valves.
If dhe switch becomes defective, thus preventing closure of the valre, two alternatives are left. If a containment isolation signal is initiated, this circuitry bypasses the switch and will close the valve.
In addition, there are pushbuttons located at'the motor control center to close the valve.
~
In summary, we are protected against this type of failure at Crystal River Unit #3.
Please contact us if any clarification or further discussion is required.
Very truly yours, y
J. T. Rodge s Assistant Vice President JTR/ns e
4 3
t
..