ML19116A246

SR-2019-001-00 for Palo Verde Nuclear Generating Station (PVNGS) Unit 1, Fuel Building Ventilation System High Range Radioactive Gaseous Effluent Monitor Nonfunctional

ML19116A246
Person / Time
Site:	Palo Verde
Issue date:	04/26/2019
From:	Lacal M Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-07910-MLL/SPD SR-2019-001-00
Download: ML19116A246 (3)

Text

ODCM 2.1 MARIA L. LACAL Se ni or Vice President Nu clea r Reg ul atory and Ove rsight Palo Verde Nuclear Generati ng Station P.O. Box 52034 Phoe nix, AZ 85072 Mai l Station 7605 Tel 623 393 649 1 102-07910-M LL/SPD April 26, 2019 ATTN : Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station (PVNGS) Unit 1 Docket No. STN 50-528 /License No. NPF 51 Special Report 1-SR-2019-001-00 Enclosed please find Special Report 1-SR-2019-001-00, wh ich 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 Special 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 .

Sincerely, MLL/SPD

Enclosure:

Special Report 1-SR-2019-001-00, Fuel Building Ventilation System High Range Radioactive Gaseous Effluent Monitor Nonfunctional cc: S. A. Morris NRC Reg ion I V Regional Administrator S. P. Lingam 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 1-SR-2019-001-00 Fuel Building Ventilation System High Range Radioactive Gaseous Effluent Monitor Nonfunctional

Palo Verde Nuclear Generating Station Special Report 1-SR-2019-001-00 Fuel Building Ventilation System High Range Radioactive Gaseous Effluent Monitor Nonfunctional Docket No. STN 50-528, Unit 1 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 0427 Mountain Standard Time (MST) on April 13, 2019, Unit 1 was in a refueling outage. The fuel building ventilation system high range radioactive gaseous effluent monitor (RU-146) was declared nonfunctional when its 120 VAC Class 1E power supply was removed from service in support of a unit modification.

The monitor 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 April 12, 2019, at 0840 MST in anticipation of the planned 120 VAC Class 1E power supply outage.

Portable area monitors were placed on the roof to measure dose rates in the event of an accident. The parameters being monitored were post accident high range conditions, specifically dose rates due to gases. On April 21, 2019, at 1314 MST, RU-146 was declared FUNCTIONAL after restoration of power and completion of the channel check surveillance test.

Cause of the Nonfunctionality:

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 removal of its associated 120 VAC Class 1E power.

Plans and Schedule for Restoring the System to FUNCTIONAL Status:

The monitor was restored to a functional status as described above.

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