ML19305D235
| ML19305D235 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/03/1980 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8004140273 | |
| Download: ML19305D235 (1) | |
Text
PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 (NGINEERING AND RESEARCH CEPARTMENT Docket No. 50-277 U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention: Mr. T. A. Ippolito, Chief Operating Reactors Branch #3
Subject:
Peach Bottom Atomic Power Station Notification of Intent to Modify Unit 2 Containment Suppression Chamber
Dear Mr. Ippolito:
Philadelphia Electric Company has actively participated in the Mark I Containment Program since 1975 As part of the program, a plant unique analysis is being performed to evaluate the suppression chamber (torus) design for newly identified suppression pool hydrodynamic loads.
The results of the analysis performed to date for the Peach Bottom Atomic Power Station have indicated the need for modifications to the torus in order to mitigate the effects of the hydrodynamic loads. PECO will be installing some of the required load mitigation devices in the Peach Bottom Unit #2 torus during the current refueling outage. A brief description of the modifications is as follows:
1.
Installation of MSHV discharge line T-quenchers and vacuum relief valves to lessen the dynamic loads resulting from steam condensation in the suppression pool due to MSHV actuation.
2.
Installation of vent header deflectors to reduce the pool swell impact load on the vent header.
3 Installation of downcomer ties to provide bracing to distribute the lateral thrust between the two downcomer ends.
h.
Installation of RHR discharge line elbows to promote torus water mixing.
The design, fabrication, testing, inspection, and certification that are required in the manufacture and installation of the modifications will be performed in accordance with the applicable ASME Codes.
Very truly yours, 0y-
. S. Kemp r Vice President DM0/dme 80 0.414 o p.73