The amendment clarifies that the replacement control valves must be like-in-kind with the existing Siemens flanged DN50 and DN32 models, rather than the NPT sizes listed in the price schedule. A site visit cannot be conducted at this time; instead, attached photographs provide the requested information on tube-bundle removal clearance, control-valve arrangement, and proposed locations for the three secondary steam isolation valves. The amendment also addresses other questions received from prospective contractors.