ML19338G437
| ML19338G437 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 10/10/1980 |
| From: | Morisi A BOSTON EDISON CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| 80-262, NUDOCS 8010290351 | |
| Download: ML19338G437 (2) | |
Text
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BOSTON EDISON COMPANY Gras =*i, Caricts eco sonsro Starse Ocstcw. MassAcwLstrts 02199
- 4. v!C19R neatst ECLEAS OPSSATIONS SUPPORT DEPARM!rt October 10, 1980 BECo. Ltr. #80-262 Mr. Thomas A. Ippolito, Chief Operating Reactors Branch #2 Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commisison Washington, D. C.
20555 License No. DPR-35 Docket No. 50-293 Supplement to Infomation on Bypass and Reset of Engineered Safety Features Ref, a) BECo 1 tter ( A. V. Morisi) to NRC (T. A. Ippolito) titled " Additional Information on Bypass & Reset of Engineered Safety Features", dated September 29, 1980
Dear Sir:
As stated in Ref. a) the following infomation is provided in response to Items 1 & 2 of your letter dated August 12, 1920.
Item 1 For the CVI system, describe the extent to which the input instrumentation channels (including sensors), logic, etc., have been qualified to withstand the environmental and seismic conditions that could be expected to exist at the point of installation during postulated accidents.
Response
The input instrumentation channels (including sensors), logic, etc., associated with the Containment Ventilation Isolation system were installed as Class I (Q-listed) and the control swtiches and relays associated with the applicable logics are mounted on main control room Class 1 pMels. The seismic qualifica-tion of this equipment is discussed in Amendment 18 to the PNPS Unit 1 FSAR.
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l Also, the instrument sensors located in the reactor building secondary contain-
%g ment are qualified to the expected environmental conditions.
B)010200 %
- ' Co: TON E::l CON COMPANY Mr. Thomas A. Ippolito, Chief October 10, 1980 Page 2 Item 2 For the Control Room Isolation system, describe the extent to which the input instrumentation channels (including sensors), logic, etc., have been qualified to withstand the environmental and seismic conditions that could be expected to exist at the point of installation during postulated accidents.
Response
The Control Room Environmental Air System is used to supply cooling air to the control room after a LOCA and/or a loss of offsite power.
Initiation of the system is via operator action from controls located on main control room panels designed for seismic conditions as discussed above. All control / instrument com-ponents used in the control circuits for the supply fans and associated dampers were installed as safety related (Q-listed). The radiation detector, monitor, and recorder used as the basis for transferring from the normal ventilation system to the Control Room Environmental Air system was originally Q listed, however, the equipment could not be purchased as seismically qualified at the time of installation.
The Control Room Isolation System, as described, satisfies the design basis criteria specified in the Final Safety Analysis Report.
Should you have any additional questions on this subject, please do not hesitate to contact us.
Very truly yours, f f;l6L YN "[V E