ENS 52056
ENS Event | |
|---|---|
18:30 Jun 30, 2016 | |
| Title | Both Primary Containment Isolation Valves for a Penetration Potentially Inoperable |
| Event Description | On June 30, 2016 at 1430 [EDT], with the reactor at 100 [percent] and the mode switch in RUN, Pilgrim Station determined both Primary Containment Isolation Valves (PCIVs) CV-5065-91 and CV-5065-92 for Drywell Penetration X-32A were inoperable due to the potential failure of relays relied on to perform the primary containment isolation function.
The valves have been closed and deactivated in the isolated condition in accordance with Technical Specification Limiting Condition For Operation Action Statement 3.7.A.2.b. Preparations are in progress to replace the relays to restore the valves to operable status. This 8-hour notification is being made in accordance with 10 CFR 50.72 (b)(3)(v)(C) and 10 CFR 50.72 (b)(3)(v)(D). The licensee has notified the NRC Senior Resident Inspector. The licensee will notify the Commonwealth of Massachusetts.
This notification is being made to retract event notification EN 52056 made by Pilgrim Nuclear Power Station on June 30, 2016, that reported the potential failure of relays that could have prevented the fulfillment of the safety function of primary containment isolation valves (PCIVs) needed to control the release of radioactive material and mitigate the consequences of an accident. Post replacement testing of the removed relays associated with PCIV CV-5065-91 and CV-5065-92 demonstrated the ability of these relays to perform the required safety function. Based on the test results, no loss of PCIS safety function occurred while the relays were physically installed and operating. Therefore, Event Number 52056, made on June 30, 2016, is being retracted. The NRC Senior Resident Inspector has been notified. Notified R1DO (Powell). |
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-0.18 h-0.0075 days <br />-0.00107 weeks <br />-2.46564e-4 months <br />) | |
| Opened: | Paul Gallant 18:19 Jun 30, 2016 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Aug 29, 2016 |
| 52056 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |