ML20066K823
| ML20066K823 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 11/15/1982 |
| From: | Morisi A BOSTON EDISON CO. |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-SSINS-6820 82-299, IEB-80-06, IEB-80-6, NUDOCS 8211290660 | |
| Download: ML20066K823 (2) | |
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BOSTON EDISDN COMPANY GENERAL OrricEs 500 movLaTON ETmEET 90ETON. MASSAcNUEETTE O2199 A. V. M O RISI M/6 47ER NUCLEAR OPERATIOha diUPPORT DEPARTMENT November 15, 1982 BECo. Ltr. #82-299 Mr. Ronald C. Haynes Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 License No. DPR-35 Docket No. 50-293 Supplemental Response to IE Bulletin #80-06
Reference:
a)
IE Bulletin #80-06, dated March 30, 1980 b)
IE Bulletin #80-06 Response, G. C.
Andognini to B. H. Grier dated June 27, 1980
Dear Sir:
In Reference a) IE Bulletin #80-06, you requested that Boston Edison Company (BECo) review the drawings for all systems serving safety-related functions at the schematic level to determine whether or not,upon the reset of an ESF actuation signal, all associated safety-related equipment remains in its emergency mode.
If any safety-related equipment does not remain in its emergency mode upon reset of an ESF signal, describe proposed system mod-ification, design change, or other corrective action planned to resolve the problem.
As a result of your request to review the drawings, BECo identified that the HPCI Auxiliary 011 Pump did not meet the criteria for reset of an ESF signal i
ogg and proposed a modification to the control circuitry as described in Reference zg b).
Du However, on closer review it was determined that a modification to the auxiliary co 8@
oil pump circuit was not necessary for the following reasons:
Examination of F$
the auxiliary oil pump elementary diagram, shows that a normally closed contact o
from the HPCI turbine's internal oil system pressure switch is in series with g
8m all of the controls which act to automatically start the auxiliary oil pump.
80 This contact functions to automatically shut down the auxiliary oil pump once the turbine's shaft-driven oil pump delivers rated pressure.
If the contemplated snu '
Ed" modification were to be effected as stated in Reference b), the auxiliary oil pump would continue to run, only until the shaft-driven oil pump reaches operating pressure regardless of reset of the initiating signal. At this instant the auxili-ary pump would be de-energized by the turbine's oil pressure switch.
Since the HPCI turbine must be capable of delivering full system design injection flow withinf6Il
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CO3 TON ED12ON COMPANY Mr. Ronald C. Haynes November 15, 1982 Page 2 25 seconds after initiation, the shaft-driven oil pump must also be producing its full output within this time. Therefore, the auxiliary oil pump would normally run for about 25 seconds into the starting period even with the proposed modifica-tion installed.
BECo feels that the HPCI auxiliary oil pump control circuit meets the intent of IE Bulletin 80-06 and any anticipated modifications are not required.
We trust that this letter is responsive to your concerns; however, should you have any further questions or concerns on this subject, please contact us at your convenience.
Very truly yours, t 2.
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