ML20135G957: Difference between revisions
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{{#Wiki_filter:B-40 valves (CH-SOV-242 and -242B) to correct previously identified single failure concerns. | {{#Wiki_filter: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: | 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. | 1. Both charging pumps start. | ||
: 2. CH-MOV-257 and CH-MOV-257B close. | : 2. CH-MOV-257 and CH-MOV-257B close. | ||
: 3. RWST suction isolation valves BA-MOV-32 and BA-MOV-373 open. | : 3. RWST suction isolation valves BA-MOV-32 and BA-MOV-373 open. | ||
The charging pump suction vent line arrangement. is shown below. | The charging pump suction vent line arrangement. is shown below. | ||
ASP Modeling Assumptions and Approach Installation and later discovery of the leaking solenoid valves occurred during a single Figure removed during SUNSI review.}} | |||
ASP Modeling Assumptions and Approach Installation and later discovery of the leaking solenoid valves occurred during a single}} | |||
Latest revision as of 01:47, 12 December 2024
| 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.
ASP Modeling Assumptions and Approach Installation and later discovery of the leaking solenoid valves occurred during a single Figure removed during SUNSI review.