ML18306A762

Special Report 2-SR-2018-001-00 for Palo Verde Nuclear Generating Station (Pvngs), Unit 2, Fuel Building Ventilation System High Range Radioactive Gaseous Effluent Monitor Nonfunctional

ML18306A762
Person / Time
Site:	Palo Verde
Issue date:	11/01/2018
From:	Lacal M Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-07817-MLL/SPD 2-SR-2018-001-00
Download: ML18306A762 (4)

Text

ODCM 2.1 Oaps MARIA L. LACAL Senior Vice President Nuclear Regulatory and Oversight Palo Verde Nuclear Generating Station P.O. Box 52034 Phoenix, AZ 85072 Mail Station 7605 Tel 623 393 6491 102-07817-MLiySPD November 1, 2018 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station (PVNGS) Unit 2 Docket No. STN 50-529 / License No. NPF 51 Special Report 2-SR-2018-001-00 Enclosed please find Special Report 2-SR-2018-001-00, which is prepared and submitted pursuant to PVNGS Offsite Dose Calculation Manual requirements. This report discusses the nonfunctionality of a fuel building ventilation system high range radioactive gaseous effluent monitor for more than 7 days.

Copies of this Spedai Report are being forwarded to the Nuclear Regulatory Commission (NRC), NRC Region IV, and the Senior Resident Inspector.

Arizona Public Service Company makes no commitments in this letter. If you have questions regarding this submittal, please contact Matthew Kura, Department Leader, Nuclear Regulatory Affairs, at (623) 393-5379.

Sincereiy, MLtySPD

Enclosure:

Special Report 2-SR-2018-001-00, Fuel Building Ventiiation System High Range Radioactive Gaseous Effiuent Monitor Nonfunctionai cc: K. M. Kennedy NRC Region IV Regional Administrator M. D. Orenak NRC NRR Project Manager for PVNGS C. A. Peabody NRC Senior Resident Inspector PVNGS A member of the STARS Alliance LLC Callaway

• Diablo Canyon

• Palo Verde

• Wolf Creek

Enclosure Special Report 2-SR-2018-001-00 Fuel Building Ventilation System High Range Radioactive Gaseous Effluent Monitor Nonfunctional

Palo Verde Nuclear Generating Station Special Report 2-SR-2018-001-00 Fuel Building Ventilation System High Range Radioactive Gaseous Effiuent Monitor Nonfunctional Docket No. STN 50-529, Unit 2 Reporting Requirement:

The Palo Verde Nuclear Generating Station Offsite Dose Calculation Manual revision 27 (ODCM) includes functionality requirements for radioactive gaseous effluent monitoring instrumentation. Action 42 of Table 2-1, specifies the following: With the number of channels FUNCTIONAL less than required by the Minimum Channels FUNCTIONAL requirement, initiate the Preplanned Alternate Sampling Program to monitor the appropriate parameter(s) within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, and:

a) Either restore the nonfunctional channel(s) to FUNCTIONAL status within 7 days of the event, or b) Prepare and submit a Special Report to the Commission within 14 days following the event outlining the action(s) taken, the cause of the nonfunctionality, and the plans and schedule for restoring the system to FUNCTIONAL status.

Initial Conditions:

At 0845 Mountain Standard Time (MST) on October 15, 2018, Unit 2 was in a refueling outage. The fuel building ventilation system high range radioactive gaseous effluent monitor (RU-146) was declared nonfunctional at this time due to its 120 VAC Class IE power supply being removed from service in support of a unit modification.

RU-146 was not restored to FUNCTIONAL status within 7 days.

Actions Taken:

The Preplanned Alternate Sampling Program was initiated to monitor appropriate parameters pursuant to ODCM Requirement ACTION 42 of Table 2-1 on October 13, 2018, at 1555 MST, in anticipation of the planned 120 VAC Class IE power supply outage. On October 23, 2018 at 1159 MST, RU-146 was declared FUNCTIONAL after restoration of power and completion of the channel check surveillance test.

Cause of the Nonfunctionalitv:

There was no monitor malfunction associated with the nonfunctionality of RU-146. The cause for exceeding the 7 days allowed by ODCM Action 42 of Table 2-1 was due to the schedule being extended during the implementation of a modification to improve the reliability of the 120 VAC inverters that supply power to RU-146. The cumulative effect of the work performed resulted in RU-146 being out of service for greater than 7 days.

Palo Verde Nuclear Generating Station Special Report 2-SR-2018-001-00 Plans and Schedule for Restoring the System to FUNCTIONAL Status:

On October 23, 2018 at 1159 MST, RU-146 was declared FUNCTIONAL following completion of the modification work and after completion of the channel check surveillance test.