Temporary Strainers

<a href="http://www.nrc.gov/reading-rm/doc-collections/gen-comm/info-notices/1985/in85096.html">http://www.nrc.gov/reading-rm/doc-collections/gen-comm/info-notices/1985/in85096\ .html</a>

<<This information notice is provided to alert recipients about a potentially
significant problem pertaining to temporary construction strainers left in-
stalled in the suction piping of safety-related pumps.

[...]

[...] personnel discovered temporary strainers left installed in the
suction piping of two high-pressure injection (HPI) pumps. The strainers were installed during plant construction to prevent debris from entering pump internals. These temporary construction strainers are normally removed
before hot functional testing.

[...] the first HPI pump strainer was

found during maintenance to repair a flange leak. The discovery occurred when TEC Engineering processed a report indicating strainer damage. Evidently the strainer was damaged as maintenance personnel attempted to remove what appeared to be a pipe spacer ring. The ring was actually part of
the strainer. Strainer identification was made difficult because, once installed, the visible ring closely resembled the spacer rings used to replace strainers in other systems. Strainers normally were removed from the
ring and then the rings were reinserted as pipe spacers. The stainless steel
strainers consist of a perforated conical basket that is attached to a circular flange plate bolted to pump suction piping.>> Received on Thu Apr 08 17:50:00 2004