ML030910387
| ML030910387 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 03/26/2003 |
| From: | Overbeck G Arizona Public Service Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 192-01115-GRO/SAB/REB, 3-SR-2003-001 | |
| Download: ML030910387 (3) | |
Text
L^hS ODCM 2.1 Palo Verde Nuclear Generating Station Gregg R. Overbeck Senior Vice President Nuclear TEL (623) 393-5148 FAX (623) 393-6077 Mail Station 7602 P.O. Box 52034 Phoenix, AZ 85072-2034 192-01115-GRO/SAB/REB March 26, 2003 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, D C 20555-0001
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Unit 3 Docket No. STN 50-530 Special Report 3-SR-2003-001 Attached please find Special Report 3-SR-2003-001 prepared and submitted pursuant to the PVNGS Offsite Dose Calculation Manual requirements. This report discusses the inoperability of the plant ventilation system high range radioactive gaseous effluent monitor for more than seventy-two (72) hours.
No commitments are being made to the NRC by this letter.
If you have any questions, please contact Dan Marks, Section Leader, Compliance, at (623) 393-6492.
Sincerely, G RO/SAB/REB/kg a,
Attachment cc:
E. W. Merschoff (Region IV)
J. N. Donohew N. L. Salgado (all with attachment)
A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway
- Comanche Peak
- Diablo Canyon
- Palo Verde
- South Texas Project
- Wolf Creek
Attachment Special Report No. 3-SR-2003-001
Palo Verde Nuclear Generating Station Unit 3 Special Report No. 3-SR-2003-001 Plant Ventilation Radioactive Gaseous Effluent High Range Monitoring Instrumentation Inoperable Docket No. STN 50-530 Initial Conditions:
At approximately 0820 MST on March 4, 2003, Palo Verde Unit 3 was operating at approximately 99 percent power when the Plant Ventilation Radioactive Gaseous Effluent High Range Monitor (RU-144) was declared inoperable to perform surveillance testing.
This Special Report is being submitted pursuant to the ODCM requirement 2.1, ACTION 42(b) to prepare and submit a Special Report to the Commission within 30 days if the monitor is not restored within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The 72-hour period for returning the monitor to an operable status expired at approximately 0820 MST on March 7, 2003 with the monitor not operable.
Actions Taken:
The Preplanned Alternate Sampling Program for RU-144 to monitor the plant ventilation system exhaust was implemented pursuant to the ODCM requirement 2.1, ACTION 42(a) on March 7, 2003 at approximately 1000 MST. On March 7, 2003 at approximately 1635 MST, the monitor was declared OPERABLE following successful completion of maintenance and surveillance testing activities.
Cause of the Inoperability:
The cause for exceeding the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed by ODCM 2.1, Action 42(b) was a combination of scheduled surveillance testing and subsequent maintenance activities.
During the performance of the testing, problems were encountered with the testing geometry, the check source, and procedure steps. In addition, problems were encountered with the low range radiation monitor (RU-143) associated with RU-144.
The cumulative effect of these issues resulted in RU-144 being out of service for approximately 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br /> and 15 minutes.
Plans and Schedule for Restoring the Channels to OPERABLE Status:
On March 7, 2003 at approximately 1635 MST, the monitor was returned to service and declared OPERABLE. The total elapsed time of the inoperability was 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br /> and 15 minutes.