ML20129D744
| ML20129D744 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/28/1985 |
| From: | Whittier G Maine Yankee |
| To: | Butcher E Office of Nuclear Reactor Regulation |
| References | |
| 5962L-RPJ, GDW-85-185, GL-83-10, MN-85-125, NUDOCS 8507160641 | |
| Download: ML20129D744 (2) | |
Text
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1 MAIRE HARHEE 'ATOMICP0MIERCOMPARUe avausrajain"e%l (207) 623-3521 O
June 28,1985 MN-85-125 GDW-85-185 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Mr. Edward J. Butcher, Jr.
Acting Branch 011ef Operating Reactors Branch No. 3 Division of Licensing
References:
(a) License No. OPR-36 (Docket No. 50-309)
(b) USNRC Letter to MYAPCo dated August 17, 1984 (c) USNRC Letter to MYAPCo dated January 29, 1985 (d) MYAPCo Letter to USNRC dated January 18,1985 (MN-85-13)
(e) MYAPCo Letter to USbRC dated May 28, 1985 (MN-85-96)
Subject:
Clarification of RCP Trip Criteria Gentlemen:
In reviewing the correspondence regarding Maine Yankee's response to Generic Letter 83-10, we have noted that our revised RCP trip criteria has not been specifically identified to the bRC. This criteria has, however, been mentioned as a portion of the responses to NRC questions, Reference (b), in Reference (e).
For purposes of clarification, Maine Yankee would like to correct this oversight by specifying the criteria.
The RCPs will be manually tripped upon reaching a core exit subcooling of 250F. This subcooling level also corresponds to the Subcooling Margin Monitor Low Margin Alarm. An further protection, the plant operators are instructed to trip individual RuPs if excessive shaft vibration or severe pump amperage oscillations are observed.
The criteria specified above are supported by analysis as documented in References (c), (d), and (e).
The Emergency Operating Procedures are in the process of being revised to reflect the new criteria.
The previous criteria of manually tripping the RCPs on a SIAS alarm will be eliminated.
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8507160641 850628 I O PDR ADOCK 05000309 5962L-RPJ P
MAINE YANKEE ATOMIC POWER COMPANY
-United States Nuclear Regulatory Commission Page Two Attention: Mr. Edward J. Butcher, Jr.
PN-85-125 If you have any questions, please feel ree to contact us.
Very truly yours, MAINE YANKEE ATOMIC POWER C0ffANY d
M G. D. Whittier, Manager Nuclear Engineering & Licensing
.GDW/bjp
Enclosure:
cc: Mr. Edward J. Butcher, Jr.
Dr. Thomas E. Murley Mr. Cornelius F. Holden t
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