ML22313A035
| ML22313A035 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/09/2022 |
| From: | Jeffrey Riley Dominion Energy Nuclear Connecticut |
| To: | Brian Fuller NRC/RGN-I/DORS/OB |
| References | |
| EPID L-2022-OLL-0007 | |
| Download: ML22313A035 (1) | |
Text
SUBMITTED POST-EXAMINATION COMMMENTS AND NRC RESOULTION The facility licensee submitted comments for two written examination questions. The comments and associated NRC resolutions are provided below.
RO Question No. 24 What would constitute a loss of CONTAINMENT INTEGRITY?
A. The outer Containment airlock door failed its leak test while in MODE 1.
B. The Equipment Hatch is secured by a minimum of 4 bolts in MODE 4.
C. The Containment leak rate exceeds its Technical Specification leakage value (La) while in MODE 5.
D. The Containment purge valves are open while moving irradiated fuel assemblies inside containment.
Answer: B References provided to NRC: Unit 2 technical specifications and bases Comment: Need to look at whether answer choice A is also correct.
Facility recommendation: Answer choice A is not correct.
NRC resolution: Answer choice A is not correct because though the outer containment airlock door would be considered inoperable upon failing a leak rate test, containment integrity is still met by the remaining operable air lock door and the requirements in Technical Specification 3.6.1.3 which ensures that a leak tight containment barrier is maintained by use of the remaining operable air lock door.
SRO Question No. 77 Question #77 A Small Break Loss of Coolant Accident has occurred.
EOP 2532, Loss of Coolant Accident procedure requires a controlled cooldown be performed.
- 1. The cooldown is required to be initiated 1..
AND
- 2. The reason for cooldown is to 2. ?
A. 1. after 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at > 40 °F/hr and the RCS be reduced by at least 40 °F after 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />
- 2. conserve Condensate inventory and comply with the long-term cooling analysis B. 1. after 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at > 40 °F/hr and the RCS be reduced by at least 40 °F after 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />
- 2. to ensure Safety Injection maintains adequate Shutdown Margin C. 1. within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at a rate of > 40 °F/hr
- 2. conserve Condensate inventory and comply with the long term cooling analysis D. 1. within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at a rate of > 40 °F/hr
- 2. to ensure Safety Injection maintains adequate Shutdown Margin Answer: A
References provided to NRC:
Postexamination Comment: The question has no correct answer because after 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> at >
40F/hr is not correct since the cooldown must be initiated no later than one hour after the event.
And within one hour at a rate of >40F/hr is not correct because there is no requirement to initiate a cooldown in the first hour at >40F/hr.
Facility recommendation: No correct answer NRC resolution: No correct answer. The question has been deleted from the examination.