ML19330B682
| ML19330B682 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/29/1980 |
| From: | Janecek R COMMONWEALTH EDISON CO. |
| To: | Bevan R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8008050372 | |
| Download: ML19330B682 (2) | |
Text
a g-A5Y pC O One F rst Nabocal Piaza. Ch>cago. ilhno Commonwrith Edison Address Reciy to: Post Cthee Box 767 Chicago,11hnois 60690 July 29, 1980 Mr. Rooy B. Bevan, Jr.
Project Manager -
Operating Reactor - Branch 2 Division of Licensing U.
S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Quad Cities Units 1 and 2 Request for Information Concernino Containment Isolation
Dear Mr. Bevan:
Tne following is our response to an informal request for information concerning the Primary Containment Isolation (PCI) system at Quad Cities Units 1 and 2.
- 1. Cuestion:
dhat is tne scnetule for installation o f
..e u control suitenes on PCI valves to prevent opening following isolation reset?
Response
As inoicated in the telecon during which tne question was raised, modifications to PCI reset logic nave been mace to prevent reset of the isolation until tne valve control switches have been placed in the closed position.
Since switch replacement is now only an item of operator convenience, no firm schedule is availaole.
However, we expect to install the new switches during the first refueling outage which follows receipt o f the necessary equipment.
2.
Question:
What is the functiun (or description) of the ACS system?
Response
ACS is an abbreviation of Atmospheric Control System.
This system is comprised of all primary containment vent, purge, and nitrogen inerting piping, instrumentation, and associated valves required to control the containment atmosphere.
- 3. Question:
Are the 595-104 A,B,C, and D relays of the HFA or HFN type?
Response
The 595-104 A,8,C, and D relays are of the HFA type.
/hCWS/
s
//C) 8008050372,
J'
. 4.
Question:
Provide to tne NRC consultant the following crawings:
4E-15'OA, 1304, 2510, 2504 and the elementary oliagrams for the ECCS and RHR system and the drawings snowing the new PCI reset logic.
Response
The requested drawings have been transmitteo, alth tne exception of tne reviseo PCI drawings, via copy of this letter to Mr. Douc Hackett o f EG & G.
The final as-cullt reUisions of tne PCI drawirgs are expecteo to ce availacle in one to two seeks.
Please address any additional questions concerning this matter to this office.
Very truly yours, d
y 6
y Rocert F.
Janecek Nuclear Licensing Administrator Boiler Water Reactors cc:
Doug Hackett 4
5604A i