Accession Number:

AD0259803

Title:

PRELIMINARY INVESTIGATION OF SM-1 CONTROL ROD SEAL FAILURE

Descriptive Note:

Corporate Author:

ARMY ENGINEER REACTORS GROUP FORT BELVOIR VA

Personal Author(s):

Report Date:

1961-04-18

Pagination or Media Count:

23.0

Abstract:

On 26 March, the SM-1 plant experienced excessive control rod drive seal leakage rate. During a vapor container entry for instrumentation check, the leakage rate from each seal was measured. The maximum rate was found to be 6.3 gallons per hour compard to a normal valus of approximately .7 gph. Two seals were replaced with rebuilt assemblies. This reduced leakage rates to an allowable operating rate. Shim no. 3 seal was found plugged, and back flushing eliminated the plugging. Visual inspection of the disassembled Rod-B seal indicated leakage increase was due to the increased clearance probably caused by overheating due to loss of cooling water at various times in the operating period.

Subject Categories:

  • Adhesives, Seals and Binders
  • Fission Reactor Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE