ML20093F622

Forwards Draft of Brief Document on Consideration of Reliability of Existing Previously Utilized Reactor Components Re Relicensing of License R-76

ML20093F622
Person / Time
Site:	Washington State University
Issue date:	10/03/1995
From:	Wilson W WASHINGTON STATE UNIV., PULLMAN, WA
To:	Mendonca M NRC
Shared Package
ML20093F626	List: ML20093F622 ML20093F634
References
NUDOCS 9510180056
Download: ML20093F622 (3)

Text

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[ { Washington StateUniversity=

. Nuclear Radiation Center - Pullman, WA 99164-1300 '

509-335-6641 FAX 509-335-4433 '

October 3,1995

Marvin Mendonca Sr. Project Manager U.S. Nuclear Regulatory Commission Office of Non-Power Reactors

- MS 0-11-B-20

Washington, DC 20666

Dear Mr.Mendonca:

J I understand that relicensing now requims a consideration of the reliability of previously used reactor com mnents. Attached is a draft of a brief document on this subject for the WSU TRIGA mactor. Is (lis analysis adequate or is something more detailed required?

Sincerely,

^

WEWh W.E. Wilson Consultant 1

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9510100056 951003 PDR ADOCK 05000027 -

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APPLICATION FOR TEN YEAR LICENSE EXTENSION FOR FACILITY LICENSE NO. R-76 FOR THE WASHINGTON STATE UNIVERSITY MODIFIED TRIGA NUCLEAR REACTOR CONSIDERATION OF RELIABILITY OF EXISTING PREVIOUSLY UTILIZED REACTOR COMPONE S It is not possible to accurately quantify or predict the relial the various components of the WSU modified TRIGA Reactor which was @tKW converted to %s type reactorin 1%7. Over the years the reactor systems have been up ber s to improve

. performance and insure reliability as follows.

1) 1%7 - MT plate type fuel replaced with TRI typffuelin 4-rod usters. Pool cooling system mstalled allowing operationgto W rthvel of 1,000 MW. Pulse rod added to center of core and control system modif ' allow pulsing operation.

2) 1972 - New Argon-41 monitoring stem designed a i led.

I 1972 - General Atomic wide range e to contro system replacina old GE-3) startup channel and Long-N and peri ch , E linear channel replaced with new Keithly channel.

4) 1976 - Replaced sev GA Stan 4-rod fuel clusters in the center of the core with FLIP HEU f placed old od standard cluster containing pulse rod with a new FLIP 3-roj,i u clus r Standard f led instrumented fuel rod replaced with FLIP fueled instrument . JCydNv contains 35 FLIP fuel rods.

j 5) 1977 - entire n glyystem and console with new one designed and installed by l react  :

6) eplaced a d tional four (4) standard fuel 4-rod clusters with 4-rod FLIP fuel rods i

! ad FLIP fu rods. Com now contains a total of 51 FLIP fuel rods.

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7) 1983 - S o d primary cooling water mechanical pressure indication system aplaced wi transducmg with electrical readout in the control room.

8) 1985 - FLIP instrumented fuel element replaced with a new one due to failure of thermocoupled in the IFR installed in 1976.

9) 1987 - Pool room ventilation upgraded with new fans and central heating within ventilation system for pool room. OIS umt heating on walls of pool room removed.

10) 1988 - New CIC installed on safety channel #2. Com optimized increasing thermal neutron  ;

flux in rotator row by 30%.

11) 1991 - Computer interface installed to allow computer monitoring of reactor power level. )

12) 1992 - Power supply for wide range channel installed.

13) 1993 - New wide range channel ? urchased to be installed in the future. New air monitoring system purchased to x installed in the future.

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l In order to insure the reliability and adequate performance of all portions of the WSU TRIGA reactor system, a very extensive and comprehensive preventative maintenance program has j been conducted at the facility for a number of years. A copy of SOP #3 which covers the

preventative maintenance program is attached. This program has proven to be more than adequate i to preclude operation of the reactor with a faulty or inoperative portion of the system.

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