Need Help With Question

Reading a book and there are some comments about the Main Steam Stops. MS-1 and MS-2.
Question: How were MS-1&2 operated in both open and shut ops?


Edited by SaltiDawg - 20 Jul 2017 at 8:22pm

They were designed to test the ERS's endurance and tolerance to heat.

Edited by Sewer Pipe Snipe - 21 Jul 2017 at 1:17pm

Dantini,
Perfect. Thanks.
Was there an "Auto" position on the SPCP FOR THEM?
I do not believe so, however in the UNCLASSIFIED Thresher report it says there was. If one had a scram and MS-1,2 Automaticaly shut that could really complicate the recovery.
To my recollection there was no "Auto" Switch Position.

The switches for MS 1 & 2 and indicator lights were on the RPCP, not the SPCP.  The switches were right  beside the Control Switches for MCPs 1 & 2 on the upper apron portion of the RPCP. The SPCP only had indicator lights for MS 3 & 4 (Steam supply to the Main Engines and TGs), no switches.  MS 1 & 2 were closed by the Main Hydraulic system.  You would never want to open MS 1 & 2 hydraulically, especially with me in any of the machinery spaces.  The Reactor Operator actually shut 1 & 2 with his switches on a reactor scram, they did not shut automatically.  We need to recheck Sewer pipe's qual card

Edited by Dantini - 21 Jul 2017 at 3:26pm

Reading the Thresher report and analysis threads, seems little doubt that MS-1&2 had a AUTO position at the time of Thresher'ss loss, likely to prevent a cold water acident. At some point post-Thresher NR disabled or removed the AUTO function so as to allow a quicker recovery followin a Scram.

I can not find definitively whether was in Open or Auto at the time of her loss. I did not get to my first S5W boat until 3 years after Thresher.

Again, thanks for help. My bad about SPCP.