ML20011D423
| ML20011D423 | |
| Person / Time | |
|---|---|
| Site: | Rensselaer Polytechnic Institute |
| Issue date: | 12/07/1989 |
| From: | Harris D RENSSELAER POLYTECHNIC INSTITUTE, TROY, NY |
| To: | Block R RENSSELAER POLYTECHNIC INSTITUTE, TROY, NY |
| References | |
| NUDOCS 8912270173 | |
| Download: ML20011D423 (3) | |
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Rensselaer Department of Nue! ear En.nneenni: & Ene.reenne Physic INTERDEPARTMENTAL MEMORANDUM December 7, 1989 TO: Dr. Robert C.-Block,- Head Dept. of Nuclear Engineering & Engineering Physics f FROM: Dr. Donald R. Harris, Director RPl Reactor Critical Facility (RCF)
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.i The new Reactor Power Switch IdontIfled In my memorandum to you dated' November-9, 1989 (" Console Key System for RPI Reactor Critical Facility (RCF) enclosed")
was' Installed December 1, 1989 and la fully operational.
i DRH: JJd l Enc. 1 L cc: .A. Bergies (RPI) .
l G. Judd (RPI) l R. Rohr (RPI)
L E. Muzzey (RPI) i L P.-Angelo (RPI) /
j T. . Michaels (NRC)/
! P. Eselgroth (NRC)
L D. SlIk (NRC) l'.
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! 8912270173 891207 0g* '
I PDR ADOCK 05000225 P PDC , g Jonsson Engineering Center (513) 276-6402
- Gaerttner Laboratory (518) 276 6650 Rensselaer iblytechnic Institute
- Troy, New York 12180-3590
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Rensselaer ;
Department of.Nudear Engineenr.g & Engineenng Physics INTERDEPARTMENTAL MEMORANDUM Date: November'9, 1989 l
F I TO: Dr. R.C. Block, Head Dept. of Nuclear Engineering & Engineering Physics
! FROM Dr. D.R. Harris, Director /
RPI Resctor Critical Facility ,
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Subject:
Console Key System for RPI Reactor Critical Fac1lity (RCF) l At the recent SRO licence examination David Silk, the .
USNRC Region.l examiner. expressed dissatisfaction with the console key--system for the RCF. Ted Michaels, our USNRC -
cognizant officer at Bethesda, also called to request corrective actlon. I fIrst describe the present key system and the USNRC obJactions, then I propose a simple-remedy whIch has been discussed wIth SIIk and M1chaeIs and approved by them. -l recommend that this remedy be carried out.
On the RCF console are two key switches labeled Reactor and Power. On the RCF Equipment Board is a third key switch L labeled Dump Bypass. The console Power key switch, actuated l by key E158,:turno on. power to-the console recorders and the
- Egulpment Board. The console Reactor key switch, also actuated by key E158, turns on power to the Scram Relay Circult; control. rods cannot be raised without'this circuit actuated. Key E158 can be Inserted and turned to actuate the console Power switch, then removed and Inserted and t
. turned to actuate the console Reactor switch. Key 158 then can be removed.-leaving both swltches actuated, thus defeating the key function. The USNRC position is that this is inadvisable, and-l tg r ess .
The Dump Bypass key switch is actuated by key PA2235.
This key cannot be withdrawn when the Dump Bypass is actuated, and this is the proper action. The USNRC does not object to this key, and no change is proposed for this key.
Jonsson Engineering Center (518) 276-6402 + Gaerttner laboratory (518) 276-6650 Rensselaer Polytechnic Institute
- Troy, New York 12180-3590
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i lepropose that a new console Power key switch be l Installed with a new key which cannot be withdrawn when this -l nwltch is actuated. The key switch wiring would be - l unchanged. When the console Power key-switch is turned off, ;
tho' console Control key switch power turns off (but not vice '
l versa). Thus the new key for the console Power key switch will become the de facto Power / Reactor key, and it cannot be ,
withdrawn without doenergizing both the Power and Control functions. Key E188-will continue-to be used for the _
i console Control key switch, and it can still be withdrawn !
leaving this switch actuated, but removal of this switch is ;
not necessary and 'Is not proposed.
The proposed change does not require any change-In the-RCF Technical Specifications. Table 2 " Interlock", in Section 3. " Limiting Conditions for Operation", Identifies
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two Reactor Console Keys (2) 'On" with Reactor Scram as the consequence if the interlock is not satisfied. These actions are preserved under the proposed change.
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cc: R. Rohr E. Muzzey P. Angelo ,
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