ML030090098
| ML030090098 | |
| Person / Time | |
|---|---|
| Site: | University of Missouri-Columbia |
| Issue date: | 12/30/2002 |
| From: | Hobbs P Univ of Missouri - Columbia |
| To: | Alexander Adams Office of Nuclear Reactor Regulation |
| References | |
| Download: ML030090098 (6) | |
Text
Research Reactor Center University of Missouri-Columbia December 30, 2002 Mr. Alexander Adams, Jr.
U.S. Nuclear Regulatory Commission Mail Stop 012-G13 Washington, DC 20555-0001
SUBJECT:
Monthly Operations Summary Enclosed is a copy of MURR's Monthly Operations Summary for November, 2002. If you have any questions, please contact me at (573) 882-5264.
Sincerely, Paul S. Hobbs, PE Reactor Manager PSHIlmcg cc. Craig Bassett Enclosure V
Iii AN EQUAL oPPoIrrUNrn/ADA INsTrrTUON Research Park Columbia, MO 65211 PHIONE (573) 882-4211 FAX (573) 882-6360
UNY-VERSM OF JWISSOURI RESEARCH REAC"POR opERAg-Tows -,Aioj,\\TH.Ly su-%-%iARy WOTEýM, 23 ER 2 0 0 2 Preyaredby:
Oyerations Staff
INTRODUCTION The reactor operated continuously in November with the following exceptions: two shutdowns for scheduled maintenance and refueling; four unscheduled shutdowns.
MAINTENANCE ACTIVITIES 11/4/02 Refueled - removed core 02-58, loaded core 02-59.
11/10/02 Refueled - removed core 02-59, loaded core 02-60.
Replaced P501A (primary system pump) coupling flex element.
Burnished Rod Run-In contacts.
11/13/02 RAK Stack Monitor taken out of service indefinitely for repairs.
11/18/02 Refueled - removed core 02-60, loaded core 02-61.
Refurbished P-501B (primary system pump) motor contacts.
11/24/02 Refueled - removed core 02-61, loaded core 02-62.
Replaced P501A (primary system pump) coupling flex element.
11/25/02 Replaced P501A (primary system pump) coupling flex element.
ý,, -I
UNSCHEDULED SHUTDOWNS Date No.
T Cause 11/10/02 1152 Scram P501A flexible coupling failure.
On November 10, a Reactor Scram was automatically initiated when the flexible coupling on primary coolant system pump P501A failed resulting in a reduction in primary coolant system flow. The pump and motor were inspected and it was determined the failure was most likely due to a defective coupling flex element.
The coupling was replaced and P501A was tested satisfactorily. The reactor was refueled and returned to operation.
Date No.
Typ_
Cause 11/10/02 1153 RRI RRI TAA failure.
On November 10, a Rod Run-In was automatically initiated. Investigation revealed bad contacts in the RRI circuit. The contacts were burnished, all connections tightened and all relays inspected and tested for operability. All Scram and RRI signals were cleared and all relays reset normally. The failure did not recur. The reactor was subsequently returned to operation.
Date No.
Type.
Cause 11/24/02 1154 Scram P501A flexible coupling failure.
On November 24, a Reactor Scram was automatically initiated when the flexible coupling on primary coolant system pump P501A failed resulting in a reduction in primary coolant system flow. The pump and motor were thoroughly inspected. A small amount of play between the shaft and impeller was found. The coupling and pump internals were replaced and P501A was tested satisfactorily. The reactor was subsequently refueled and returned to operation. The pump's internal assembly will be overhauled.
Unscheduled Shutdowns (cont'd)
Date No.
Tye Cause 11/25/02 1155 RRI PS01A flexible coupling failure.
On November 25, a Reactor Scram was automatically initiated when the flexible coupling on primary coolant system pump P501A failed resulting in a reduction in primary coolant system flow. The pump and motor were inspected and it was determined the failure was due to a misalignment between the pump and motor.
The coupling flex element was replaced and the motor re-shimmed. The realignment was verified and the pump was tested satisfactorily. The reactor was subsequently returned to operation.
Nov OPERATION
SUMMARY
FOR MONTH OF University of Missour Research Reactor Center (MURR)
HOURS OPERATED THIS PERIOD TOTAL HOURS OPERATED, REACTOR HOURS OPERATED AT FULL POWER, THIS PERIOD TOTAL HOURS AT FULL POWER, REACTOR INTEGRATED POWER THIS PERIOD TOTAL INTEGRATED POWER, REACTOR Submitted by.
..J2lL5 MWD Custodian/Reactor Physicist Date:
Nov-02 I62835 69246 I 62670 I
243,42647 I
261.2 I 95,625 90 MWD MWD