ML20206D155
| ML20206D155 | |
| Person / Time | |
|---|---|
| Site: | University of Maryland |
| Issue date: | 04/01/1987 |
| From: | Roush M MARYLAND, UNIV. OF, COLLEGE PARK, MD |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8704130258 | |
| Download: ML20206D155 (3) | |
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THEUNIVERSITYOF MARYLAND COLLEGE PARK CAMPUS Department of Chemical and Nuclear Engineering April 1,.1987 Section 50.4 Distribution Document Control Desk U.S.
Nuclear Regulatory Commission Washington, D.C.
20555
Dear Sir / Madam:
Subject:
Reportable Occurrence of 14:32 on March-26th, 1987 at the MUTR Docket ~ #R-70' This letter represents the follow up report to a " Reportable Occurrence" which was reported by telephone at 15 :45 on 3/26/87.
A summary of what was reported is enclosed.
Safety channel (SC) #2 ionization chamber (IC) was moved out about Is" by mistake during n.aintenance on kW-hr compensated IC.
This error was discovered during subsequent operation, and the reactor was immediately shut down.
SC #2 chamber was repositioned and recalibrated against SC #1 by the standard procedure.
There was no significant impact upon the safety of the facility, personnel or the general public during the time interval when the SC #2 was mispositioned.
C i
8704130258 870401 ADOCK0500g6 PDR S
or Nuclear Engineering Program College Park. Maryland 20742 (301) 454-2430/6 glI
O Page Ltr. - U.S.
NRC April 1, 1987 The occurrence and subsequent readjustment was. discussed in a special meeting of the Reactor Safety Committee (RSC) on March 30, 1987.
The RSC approved the readjustment procedure.
It was recommended that SC #1 and #2 cable conduit be clearly marked and normal insertion position be marked in order to minimize future occurrence of this error.
SC #1 and SC #2 were marked and identified on March 31, 1987.
Sincerely, MLR:ga Marvin L.
Roush Professor / Chairman Chemical and Nuclear Engineering Enclosure cc:
Regional Administration U.S.
Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406 MUTR File Dean G.
E.
Dieter l
l
Summary of telephone conversation with Bob Ward, Duty Officer and Don Haberkamp, Region 1, NRC.concerning a Reportable Occurrence of March 26, 1987 at 14:32:
Maintenance Error on Safety Channel II.
1.
Called Mr. Bob Ward and Mr. Don Haberkamp of Region 1,
NRC at 15:45 on 3/26/87 to notify NRC of reportable occurrence at.14:32 on 3/26/87.
2.
Stated that the reportable occurrence has insignificant impact upon safety.
3.
Under shutdown' conditions during maintenance of the-kW-hr CIC chamber, the Safety Channel (SC) #2 was moved out'about 1/2" by mistake at 10:05 on 3/26/87.
i 4.
At 14:29 on 3/26/87, while proceeding to 50kW during ENNU 320 - Reactor Operations Class, the SRO noted that the SC #2 was reading low (near zero) and at 14 :32 the reactor was manually scrammed.
5.
Stated that steps were being undertaken to readjust the position of the SC #2 so that it corresponds with SC
- 1 reading.
This is the standard procedure for calibrating SC #2.
h b.
David D.
Ebert Associate Reactor Director MUTR 4
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