05000263/FIN-2016004-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Past Reactor Building Wide Range Gas Monitor Settings Prevented Transition to Mid/High Range (CAP 1537833) The following violation of very-low significance (Green) was identified by the licensee and is a violation of U.S. Nuclear Regulatory Commission (NRC) requirements which meets the criteria of the NRC Enforcement Policy for being dispositioned as a Non-Cited Violation. Title 10 of the Code of Federal Regulations (10 CFR) 50.54(q)(2) requires, in part, that a holder of a license under this part shall follow and maintain the effectiveness of an emergency plan that meets the requirements in 10 CFR Part 50, Appendix E, and the planning standards of Title 10 CFR 50.47(b). Title 10 CFR 50.47(b)(4) requires standard emergency classification and action level scheme, the bases of which includes facility system and effluent parameters, is in use by the nuclear facility licensee, and State and local response plans call for reliance on information provided by facility licensees for determinations of minimum initial offsite response measures. Contrary to the above, from June 30, 1994, through September 1, 2016, the licensee failed to maintain the effectiveness of the sites emergency plan and the emergency classification and action level scheme. Specifically, the licensee changed the Engineering Unit Conversion Factor (EUCF) for the Reactor Building (RB) Vent Wide Range Gas Monitor (WRGM), resulting in non-conservative monitor indications that were 13 times lower than the actual effluent levels. The EUCF error impacted the licensees Emergency Plans effectiveness (emergency classification and action level scheme) by reducing the licensees ability to rely on the monitor to identify radiological conditions that exceed the Emergency Action Level (EAL) initiating condition threshold for the declaration of Emergency Classification Levels ranging from an Unusual Event (UE) up to and including a General Emergency (GE). The use of the inaccurate RB Vent WRGM readings would delay the classification of an UE (RA1.2) due to actual effluent levels exceeding the threshold initiating conditions for the respective EAL, while the WRGM was erroneously indicating a much lower value. While this condition would prevent using the RB Vent WRGM for the declaration of an Alert (RA1.2), Site Area Emergency (SAE) (RS1.1), or GE (RG1.1), the licensee remained capable of performing the timely and accurate declaration of an Alert, SAE or GE by monitoring radiological conditions (releases) using the Off-gas Stack WRGM, in accordance with the bases identified in the respective EALs. Consequently, the Alert, SAE, and GE declaration (based on radiological conditions) would not be delayed or missed due to the RB WRGM issue. The NRC determined that since the change in the EUCF would have only prevented the timely and accurate classification of a potential UE (as required by 10 CFR 50.47(b)(4)) the issue was determined to be of a very-low safety significance (Green) as indicated in Inspection Manual Chapter 0609, Appendix B, Emergency Preparedness Significance Determination Process, dated September 22, 2015. On September 1, 2016, this issue was identified through the licensees self-assessment process and documented in the CAP as Action Request 01533526, Reactor Building Vent Wide Range Gas Monitor Effluent Channel Reading Non-Conservative. The licensee implemented corrective actions to correct the EUCF for the RB Vent WRGM and restore compliance. As such, the NRC determined this to be a Non-Cited Violation in accordance with Section 2.3.2 of the Enforcement Policy. |
| Site: | Monticello  |
|---|---|
| Report | IR 05000263/2016004 Section 4OA7 |
| Date counted | Dec 31, 2016 (2016Q4) |
| Type: | NCV: Green |
| cornerstone | No Cornerstone |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | D Krause G Hansen K Riemer L Haeg P Zurawski R Baker S Bell |
| Violation of: | 10 CFR 50 Appendix E 10 CFR 50.47(b)(4) 10 CFR 50.54(q) |
| INPO aspect | |
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Finding - Monticello - IR 05000263/2016004 | |||||||||||||||||||||||||||||||||||||||||
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Finding List (Monticello) @ 2016Q4
Self-Identified List (Monticello)
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