ML061880248
| ML061880248 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 06/28/2006 |
| From: | Mauldin D Arizona Public Service Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 102-05522-CDM/TNW/GAM, GL-88-017 | |
| Download: ML061880248 (2) | |
Text
David Mauldin Mail Station 7605 Palo Verde Nuclear Vice President Tel: 623-393-5553 PO Box 52034 Generating Station Nuclear Engineering Fax: 623-393-6077 Phoenix, Arizona 85072-2034 102-05522-CDM/TNW/GAM June 28, 2006 Attn: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2 and 3 Docket Nos. STN 50-528, 50-529, and 50-530 Clarification of Monitoring Core Exit Temperature During Reactor Head Placement and Removal In letter no.161-04033, dated July 2, 1991, "Completion of Programmed Enhancement (1)(b) of Generic Letter 88-17 'Loss of Decay Heat Removal,"' APS stated the following:
The PVNGS [core exit thermocouple] design conforms to the recommendations in programmed enhancement (1)(b) of Generic Letter 88-17 in that two independent temperature measurements representative of the core exit (monitoring the two core exit thermocouples) are available whenever the reactor vessel head is located on top of the reactor vessel. In addition, the PVNGS design responds to the suggestion in programmed enhancement (1)(b) of Generic Letter 88-17 in that a temperature measurement representative of the core exit (monitoring the shutdown cooling heat exchanger inlet temperature) is provided at all times during shutdown cooling system operation.
As a matter of clarification, during the short period of time immediately following reactor head placement when the core exit thermocouples are not yet connected, and immediately prior to reactor head removal when the thermocouples are disconnected (normally no more than a few hours), the temperature measurement representative of the core exit is provided by monitoring the shutdown cooling heat exchanger inlet temperature during shutdown cooling system operation.
No action by the NRC is being requested and no commitments are being made to the NRC by this letter. If you have any questions, please contact Thomas N. Weber at (623) 393-5764.
Sincerely, CDM/TNW/GAM/
A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway 9
Comanche Peak e Diablo Canyon
- Palo Verde 9 South Texas Project
- Wolf Creek 6 o0 1
ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Clarification of Monitoring Core Exit Temperature During Reactor Head Placement and Removal Page 2 cc:
B. S. Mallett M. B. Fields G. G. Warnick NRC Region IV Regional Administrator NRC NRR Project Manager NRC Senior Resident Inspector for PVNGS