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Updated LER 50-237/75-048:on 751007,through-wall crack found in drywell/torus nitrogen purge line 1604-18.Addl mods, including temp controlled isolation valve installation, delayed until proposal review.W/770531 ltr.

Accession Number: ML20090E444

Date Released: Monday, April 13, 2020

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• ML20090E440 - Updated LER 50-237/75-048:on 751007,through-wall crack found in drywell/torus nitrogen purge line 1604-18.Addl mods, including temp controlled isolation valve installation, delayed until proposal review.W/770531 ltr. (3 page(s), 6/10/1977)
• ML20090E447 - AO 50-237/75-48:on 751007,through-wall crack discovered in drywell/torus nitrogen purge line 1604-18.Caused by rapid & uneven contraction of line tee connection due to liquid nitrogen impingement resulting from boiler failure. (3 page(s), 10/17/1975)