ML20127P126
| ML20127P126 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/27/1985 |
| From: | Whittier G Maine Yankee |
| To: | Butcher E Office of Nuclear Reactor Regulation |
| References | |
| 6108L-SEN, GDW-85-191, MN-85-126, NUDOCS 8507020315 | |
| Download: ML20127P126 (1) | |
Text
l MAME HARHEE AToml0 POWER 00MPARSe avausra$ain"e%s
$9I June 27, 1985 (2 m 62 2 21 g
MN-85-126 GDW-85-191 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Mr. Edward J. Butcher, Jr.
Acting Branch Chief Operating Reactors Branch No. 3 Division of Licensing
References:
(a) License No. DPR-36 (Docket No. 50-309)
(b) MYAPCo Letter to USNRC dated June 7, 1985 (MN-85-lll)
Subject:
Maine Yankee Emergency Feedwater Capability Gentlemen:
\\
Tne purpose of this letter is to document discussions regarding Reference (b) between Maine Yankee and members of your staff. As we discussed on June 26, 1985, Maine Yankee's worst case design base accident scenario requiring emergency feedwater (EFW) assumes manual initiation of emergency feedwater within thirteen minutes. Our accident scenario is described in Section 14.10.2 of the Maine Yankee FSAR.
The Maine Yankee Operations Department personnel have several main control board indicators to verify auto-start or failure of emergency feedwater.
These indicators include; a PAN alarm indicating pump auto-start signal, EFW pump amp meters and breaker indication, auxiliary feedwater flow indication and steam generator level indication.
Additionally, Maine Yankee emergency procedures require verification / initiation of EFW flow as the initial operator action in the event of inadequate feed flow to the steam generators (EOP 2-70-6, Step 2.1).
Manual initiation of an EFW pump requires-manipulation of one switch. Our analyses assumes this action occurs within thirteen minutes, however, based on operator training and experience, it is our belief that it would occur within two to three minutes.
Please contact us should you have any questions.
Very truly yours, MAINE YANKEE ATOMIC POWER COWANY hh[ $hoh !! hob 309 pf.
cb p
[k G. D. Whittier, Manager 7-Nuclear Engineering & Licensing
/
GDW/bjp
('0 l 0
th cc: Dr. Thomas E. Murley Mr. Cornelius F. Holden 6108L-SEN