ML20245B855

Summarizes 870622 Telcon W/Ge & Util Re Possible Generic Implications Associated W/Use of non-Class 1E Components within Class 1E Protection Sys & Interface Between non-Class 1E Devices & Class 1E Circuits within BWRs

ML20245B855
Person / Time
Site:	Nine Mile Point
Issue date:	06/23/1987
From:	Stevens R Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8707010384
Download: ML20245B855 (2)

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UNITED STATES y -

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7,, J , j WASHINGTON, D. C. 20555 kv ***,/

June 23, 1987 i

NOTE T0: Nine Nile Point 2 File FROM: Robert Stevens 1

SUBJECT:

NON-CLASS 1E DEVICES CONNECTED TO CLNSS'IE SYSTEMS ,i i NRC staff members participated in a telecon with General Electric (GE) and the NMP-2 licensee (Niagara Mohawk) on June 22, 1987 to discuss the possible generic implications associated with the use of non-Class 1E components (fuses, )

diodes, varistors, resistors, etc.) within Class IE protection systems and the I interface between non-Class 1E devices (meters, recorders, controll.ers ,etc.)

and Class 1E circuits within BWRs. This telecon was a follow-up to a meeting held with GE on June 19, 1987 tc discuss the subject issue. The resulto of the telecon which include various follow-up commitments by GE are as follows:

o GEinformedthestaff'thattheNeutronMonitoringSystem(NMS) conteins numerous Class 1E/non-Class 1E interfaces with the control room annunciator system, computer system, and rod block monitor

. system. These interfaces include the use of four (4) categories of isolation devices which will be or are currentQ supported b.y 1 dnalyses but have not been qualification tested'through the N '

application of maximum credible ~ fault tests pe'r staff requirements for Class 1E isolation devices. The four categories of isolation .

devices defined by GE are: , I a l (1) Relay (coil-to-contact) isolators i s l (2) Fuse /Zener Diode Combination '

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3 Buffer Amplifier (low impedance) -l 4 Fuse / Resistor combination e GE will confirm when NED0-10139 was submitted to the staff for '

review and when possibly approved by th'e staf h GE will reference Docket for which NED0 was approved if applicable. GE will also define specific areas of NEDO reviewed and approved by the staff in an attempt to resolve issue generically.

e GE, in parallel with NED0 background search, will prepare FEMN related to the NMS specifically for NMP-2 to support interim plant operaticn until the interface issue is resolved through possible maximum credible fault qualification tests (i.e., if previous NE00 19139 review by the staff did not resolve issue than GE agreed to perform maximum credible fault tests to qualify the isolators).

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e GE stated that it has alreaay issued a letter to the NMP-2 licensee  ;

related to the June 16, 1987 FEMA which ensures that the components "

and equipment involved are Class 1E except for the Temperature Controller and associated probe (non-Class IE equipment interface with Class IE power supply). Niagar.' Mohawk stated that this will be resolved prior to full power license issuance by the installation 1

(through coordination with GE) of redundant Class 1E fuses within the l power supply circuit to the controller. The end result is that the j June 16, 1987 FEMA and associated exemption request will be j withdrawn by the licensee. l 1

e GE connitted to submit to the NRC a letter addressing the Generic implications of the subject issue os related to all BWRs. Letter should confirm that based on GE's research performed related to the NMP-2 design, there is no need for additional action to be taken for i other BWRs. Based on the similarity of all other BWRs to NMP-2, the l NMS FEMA n, ing prepared for NMP-2 is all encompassing and, thus,  !

should allow interim operation for all BWRs until the NMS issue is  ;

resolved.

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CQdp J Robert Stevens d l ICSB/ DEST

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cc: A. Thadani J. Joyce J. Mauck l R. Stevens R. Capra l l

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