Amid a week-long shutdown of the Pilgrim Nuclear Power Station, legislators from Plymouth say their greatest frustration is not with the plant’s latest closure but in trying to get the federal Nuclear Regulatory Commission to be more forthcoming about the aging nuclear plant and problems identified by their own inspectors.

On Thursday, Dec. 15, after conducting scheduled testing at the plant, a Pilgrim operator found a “small main steam line leak” and the plant’s “operators made the conservative,…