ML20009F980
| ML20009F980 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/24/1981 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| IEB-80-06, IEB-80-6, NUDOCS 8108030214 | |
| Download: ML20009F980 (3) | |
Text
I.
PHILADELPHIA ELEl.RIC COMPANY 2301 MARKET STREET P.O. DOX 8699 1881 -1981 PHILADELPHIA. PA.19101 SMaELOS L. D ALTROFF ELECfmCPm D lom 1
July 24, 1981 Re: Docket Nos. 50-277 50-278 Mr. John F.
Stolz, Chief Operating Reactors Branch #4 Divi. lion of Licensing U.S.
Nuclear Regulatory Commission l
Washington, DC 20555
Dear Mr. Stolz:
Your letter of June 24, 1981, requested additional information with regard to our May 22, 1981, letter on IE Bulletin 80-06, Engineered Safety Feature Reset Controls for Peach Bottom Atomic Power Station Units 2 and 3.
Specifically, we were asked to " provide a description of the modifications made l
to the circuitry of the Traversing In-Core Probe (TIP) nitrogen purge valves and the TIP ball valves."
The controls for the TIP purge isolation valve and the five TIP ball valves have been modified by replacing the existing, two-position, maintaineC-contact control switches with three-position, spring return-to-auta control switches.
The i
control logic has been modified so that the operator must place j
the control switches in the "open" position before the valves l
will reopen following the reset of a primary cantainment isolation signal.
i l
Ad s
!ll saae:88:a*ta8li; l
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4 Mr. John F.
Stolz Page 2 Attached is a drawing showing the circuit and contact development for a two position switch versus a three position spring return to center switch.
If there are any further questions, please contact us.
Very truly yours, l /,
/
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i TWO POSITION HAINTAINED CONTACT SWITCH CIRCUIT o
4
+
TWO POSITION MAINTAINED ISOLATION SIGNA 1 CONTACT SWITCH Si j
-- OPENS UPON ISOLATION CONTACT DEVELOPMENT 3
4 1
CONT "CLOSE" "0 PEN" S1
-2 1-2 x
VALVE SOLEN 0ID bENERGIZETOOPEN CLOSE OPEll N
/
i
~
A 4
l l
THREE POSITION SPRING RETURN TO AUTO SWITCH CIRCUIT
+
ISOLATION THREE POSITION SPl<ING SIGNAL RETURN TO AUTO SWITCH OPENS UPON--
52 CONTACT DEVELOPMENT ISOLATION CONT CLOSE' AUTO OPEli l-2 X
X 3-4 X
7 S2
-~%-
M X
X g -
l 7-8 X
l l
1 i
f S2 CLOSE AUTO OPEN 2
l VALVE
\\
l
/
I SOLENOID h EtlERGIZE K1
--- I TO OPEN i
l TRAVERSING IN-CORE PROBE SYSTEM i
1 7/22/81
- Contacts 3-4, S-6 not utilitac
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