ML20135G957

Final ASP Analysis - Haddam Neck (LER 213-90-008)

ML20135G957
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	05/14/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 213-1990-008
Download: ML20135G957 (4)

Text

B-40 valves (CH-SOV-242 and -242B) to correct previously identified single failure concerns.

The solenoid valves do not have independent control. They are deenergized to the closed position when their respective VCT suction isolation valves (CH-MOV-257 and CH MOV -257B) are closed. On a safety injection actuation signal the following automatic actions take place:

1 . Both charging pumps start.

2. CH-MOV-257 and CH-MOV-257B close.

3. RWST suction isolation valves BA-MOV-32 and BA-MOV-373 open.

The charging pump suction vent line arrangement. is shown below.

Figure removed during SUNSI review.

ASP Modeling Assumptions and Approach Installation and later discovery of the leaking solenoid valves occurred during a single